CN114738101A - Engine electronic water pump control method and device - Google Patents

Engine electronic water pump control method and device Download PDF

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Publication number
CN114738101A
CN114738101A CN202110017802.3A CN202110017802A CN114738101A CN 114738101 A CN114738101 A CN 114738101A CN 202110017802 A CN202110017802 A CN 202110017802A CN 114738101 A CN114738101 A CN 114738101A
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China
Prior art keywords
rotating speed
engine
water pump
temperature
real
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CN202110017802.3A
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Chinese (zh)
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CN114738101B (en
Inventor
林承伯
刘强
高媛媛
丘胜强
何炎迎
吴广权
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Guangzhou Automobile Group Co Ltd
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Guangzhou Automobile Group Co Ltd
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Priority to CN202110017802.3A priority Critical patent/CN114738101B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/027—Cooling cylinders and cylinder heads in parallel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a method and a device for controlling an electronic water pump of an engine, wherein the method comprises the following steps: determining real-time water temperature of an engine in a vehicle, determining a control mode of an electronic water pump according to the real-time water temperature, acquiring real-time rotating speed and real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode, determining whether the engine has overheating risk according to the real-time water temperature and the real-time load, inquiring first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data if the engine does not have overheating risk, taking the first rotating speed as target rotating speed of the electronic water pump, and controlling the electronic water pump according to the target rotating speed; according to the invention, on the premise that the engine is not overheated, the rotating speed of the electronic water pump is accurately set based on the first preset data, the water temperature of the engine is set at the optimal level of the steady-state working condition of the engine, cooling as required is realized, and the real-time requirement of the engine is met.

Description

Engine electronic water pump control method and device
Technical Field
The invention relates to the technical field of engine cooling, in particular to a method and a device for controlling an electronic water pump of an engine.
Background
In the engine cooling system, the temperature control module cools the engine through the motor-driven ball valve, the temperature control module is arranged at the water outlet of the engine and can simultaneously control a plurality of branches, and the branches comprise a plurality of branches such as a small circulation branch, a radiator branch and a warm air branch. The opening degree of the temperature control module is closely related to the control of the flow of the cooling liquid, and the opening degree of the branch can be controlled by controlling the opening degree of the temperature control module so as to realize different control effects.
However, in the existing engine cooling system, a unique water temperature sensor (with the highest temperature of the engine cylinder cover) is generally arranged at a water outlet of the engine cylinder cover to detect the water temperatures of the engine under different working conditions, and then the opening degree of a temperature control module (ball valve) is controlled based on the water temperature measured by the water temperature sensor, wherein the higher the water temperature measured by the water temperature sensor on the cylinder cover is, the larger the opening degree of the temperature control module is. In the running process of a vehicle, the working condition of the engine changes frequently and rapidly, and due to the position relation between the water temperature sensor and the temperature control module, after the temperature control module is controlled, the influence of the temperature control module on the flow of cooling liquid needs to be reflected by the water temperature sensor at the water outlet of the cylinder cover through one cycle, the response of the temperature control module and the response of the water temperature of the engine are delayed, so that the water temperature of the engine cannot rapidly meet the actual requirement of the engine, and the condition of over-cooling or over-heating of the engine is easy to occur.
Disclosure of Invention
The invention provides a method and a device for controlling an electronic water pump of an engine, which aim to solve the problem that the actual requirement of the engine cannot be met due to the fact that the water temperature of the engine is not accurately controlled in the prior art.
An electronic water pump control method for an engine comprises the following steps:
determining real-time water temperature of an engine in a vehicle, and determining a control mode of an electronic water pump according to the real-time water temperature;
if the control mode of the electronic water pump is determined to be an open-loop control mode, acquiring the real-time rotating speed and the real-time load of the engine;
determining whether the engine is at an overheating risk according to the real-time water temperature and the real-time load;
if the engine is determined to have no overheating risk, inquiring the real-time rotating speed and a first rotating speed corresponding to the real-time load in first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data are rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine;
and controlling the electronic water pump according to the target rotating speed.
An electronic water pump control device for an engine, comprising:
the system comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining the real-time water temperature of an engine in a vehicle and determining the control mode of an electronic water pump according to the real-time water temperature;
the acquisition module is used for acquiring the real-time rotating speed and the real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode;
a second determination module for determining whether the engine is at risk of overheating based on the real-time water temperature and the real-time load;
the query module is used for querying the real-time rotating speed and a first rotating speed corresponding to the real-time load in first preset data if the engine is determined not to have overheating risk, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data are rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine;
and the control module is used for controlling the electronic water pump according to the target rotating speed.
An electronic engine water pump control comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the electronic engine water pump method.
A readable storage medium storing a computer program which, when executed by a processor, implements the steps of the engine electric water pump method described above.
In one scheme provided by the method and the device for controlling the electronic water pump of the engine, the real-time water temperature of the engine in the vehicle is determined, the control mode of the electronic water pump is determined according to the real-time water temperature, if the control mode of the electronic water pump is determined to be the open-loop control mode, the real-time rotating speed and the real-time load of the engine are obtained, whether the engine has overheating risks is determined according to the real-time water temperature and the real-time load, if the engine does not have the overheating risks, the first rotating speed corresponding to the real-time rotating speed and the real-time load is inquired in first preset data, the first rotating speed is used as the target rotating speed of the electronic water pump, the first preset data is rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine, and the electronic water pump is controlled according to the target rotating speed; in the invention, in the running process of a vehicle, on the premise of ensuring that the water temperature of an engine is not overheated, the rotating speed of the electronic water pump is accurately set based on the first preset data, the water temperature of the engine can be set at the optimal level of the steady-state working condition of the engine, and on the premise of meeting the reliability of the water temperature of the engine, the on-demand control of the cooling flow is realized, so that the real-time requirement of the engine is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic view showing the structure of an engine cooling apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for controlling an electronic water pump of an engine according to an embodiment of the present invention;
FIG. 3 is another schematic flow chart of a method for controlling an electronic water pump of an engine according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an electronic water pump control device of an engine according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another configuration of an electronic water pump control for an engine according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The control method of the electronic water pump of the engine provided by the embodiment of the invention can be applied to a vehicle cooling system, and the vehicle cooling system comprises an engine cooling device and an electronic water pump control device of the engine. The Engine electronic water pump control device may be an Engine Management System (EMS), and the Engine cooling device and the EMS may communicate via a bus, where, as shown in fig. 1, the Engine cooling device includes an electronic water pump, an Engine (including a cylinder head and a cylinder body), a temperature control element (which may be a temperature control module or a thermostat), and a radiator branch (a large circulation branch) and a small circulation branch connected to the temperature control element, and the direction of an arrow shown in fig. 1 is a flow direction of a coolant. The electronic water pump drives the impeller through the motor, is completely decoupled from the rotating speed of the engine, and can perform stepless regulation by controlling the current magnitude through the motor. The flow pumped by the electronic water pump is divided to enter a cylinder cover and a cylinder body of the engine, the temperature control module can use a temperature control module in an electric control ball valve mode, and the thermostat can be a thermostat with a double-wax-bag structure. The water temperature sensor is arranged on the engine to acquire the real-time water temperature of the engine, and then the rotating speed of the electronic water pump is controlled according to the real-time water temperature of the engine.
In one embodiment, a cylinder body and a cylinder cover of an engine are in a series structure, a water temperature sensor is arranged at a water outlet of the cylinder cover to obtain real-time water temperature of the engine, after the vehicle is powered on, an EMS (energy management system) determines the real-time water temperature of the engine in the vehicle through the water temperature sensor, determines a control mode of an electronic water pump according to the real-time water temperature, acquires real-time rotating speed and real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode, determines whether the engine has overheating risk or not according to the real-time water temperature and the real-time load, inquires first rotating speed corresponding to the real-time rotating speed and the real-time load in first preset data if the engine does not have the overheating risk, takes the first rotating speed as a target rotating speed of the electronic water pump, the first preset data is rotating speed data calibrated by the electronic water pump under a steady-state working condition of the engine, controls the electronic water pump according to the target rotating speed, the rotating speed of the electronic water pump is accurately set based on two kinds of rotating speed data, the water temperature of the engine can be set at the optimal level of the steady-state working condition of the engine on the premise of ensuring that the water temperature of the engine is not overheated, and on the premise of meeting the reliability of the water temperature of the engine, the cooling flow can be controlled as required.
In other embodiments, the engine cooling device is based on a split-flow design of an engine cylinder body and a cylinder cover, the cylinder body and the cylinder cover can be cooled in a partitioned manner through technologies such as a double thermostat or a temperature control module, and on the basis of split-flow cooling, in order to ensure the risk of thermal damage of the cylinder body and the cylinder cover, water temperature sensors need to be designed on the cylinder body and the cylinder cover respectively, so as to accurately control the water temperature of the engine, wherein as shown in fig. 1, the water temperature sensors on the engine can comprise a sensor 1 arranged at a water outlet of the cylinder cover and a sensor 2 arranged inside the cylinder body, so as to obtain the actual water temperatures on the cylinder cover and the cylinder body of the engine respectively, and then the rotating speed of the electronic water pump is controlled in different stages through the actual water temperatures in different areas of the engine, so as to further improve the accurate control of the water temperature of the engine.
In this embodiment, the vehicle cooling system includes an engine cooling device and an engine electronic water pump control device, the engine electronic water pump control device may be an engine management system, the specific device of the engine cooling device is only an exemplary illustration, in other embodiments, the engine electronic water pump control device may also be other control devices, and the engine cooling device and the vehicle cooling system may also include other devices, which are not described herein again.
In an embodiment, as shown in fig. 2, an electronic water pump control method for an engine is provided, which is described by taking EMS as an example, and includes the following steps:
s10: determining real-time water temperature of an engine in the vehicle, and determining a control mode of the electronic water pump according to the real-time water temperature.
After the vehicle is powered on, the EMS needs to determine the real-time water temperature of an engine in the vehicle and determine the control mode of the electronic water pump according to the real-time water temperature. The real-time water temperature in the embodiment can be the water temperature of a cylinder cover at a water outlet of an engine cylinder cover, the real-time water temperature is obtained through a water temperature sensor arranged at the water outlet of the engine cylinder cover, and after the water temperature of a cylinder body is obtained, the control mode of the electronic water pump is judged according to a preset water temperature threshold value of the water temperature of the cylinder body.
For example, after obtaining the real-time water temperature T, it is determined whether the real-time water temperature T is greater than a cold start threshold Tc1If the real-time water temperature T is smaller than or equal to the cold start threshold, the engine needs to enter a cold start mode to warm up the engine, and the control mode of the electronic water pump is determined to be a warm-up control mode; if the real-time water temperature T is larger than the cold start threshold value, the engine does not need to enter a cold start mode, and at the moment, the control mode is determined to be a normal working mode, namely, an open loop control mode. Wherein the cold start threshold Tc1For a preset value, a cold start threshold value T is setc1The starting temperature of the thermostat is required to be referenced and determined by combining the actual test effect, and the cold start threshold T can be generally setc1Set in the range of 70 ℃ to 90 ℃.
S20: and if the control mode of the electronic water pump is determined to be the open-loop control mode, acquiring the real-time rotating speed and the real-time load of the engine.
If the control mode of the electronic water pump is determined to be the open-loop control mode according to the real-time water temperature of the engine, the real-time rotating speed and the real-time load of the engine need to be acquired, so that the rotating speed of the electronic water pump can be controlled according to the real-time working condition of the engine.
S30: and determining whether the engine has overheating risks according to the real-time water temperature, the real-time load and second preset data, wherein the second preset data are electronic water pump rotating speed data determined after the overheating risks of the engine are evaluated according to different engine water temperatures and engine loads.
After the control mode of the electronic water pump is determined to be the open-loop control mode, second preset data needs to be acquired, and whether the engine has overheating risks or not is determined in the second preset data according to the real-time water temperature and the real-time load. The second preset data are electronic water pump rotating speed data determined after the overheating risk of the engine is evaluated according to different engine water temperatures and engine loads, in the second preset data, the engine water temperatures and the engine loads are evaluated according to the overheating risks of the engine under different engine water temperatures and engine loads, the engine water temperatures and the engine loads are divided into a plurality of intervals according to risk evaluation conditions, the overheating risk evaluation conditions correspond to each interval, and different electronic water pump rotating speed values are set for different engine water temperatures and different engine loads correspondingly in each interval.
S40: if the engine is determined not to have overheating risk, inquiring a real-time rotating speed and a first rotating speed corresponding to a real-time load in first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data are rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine.
And if the engine is determined to have no overheating risk in the second preset data according to the real-time water temperature and the real-time load, inquiring a first rotating speed corresponding to the real-time rotating speed and the real-time load in the first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data is the rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine. The method comprises the steps of inquiring first preset data to determine the rotating speed of an electronic water pump based on the working condition of an engine, and aiming at searching a lower rotating speed of the electronic water pump which is obtained through calibration under the steady-state working condition of a bench test so as to ensure that the rotating speed of the electronic water pump is reduced as much as possible under the unnecessary condition, reduce power consumption and meet the requirement of thermal management.
S50: and if the engine is determined to have overheating risk, inquiring a second rotating speed corresponding to the real-time water temperature and the real-time load in second preset data, and taking the second rotating speed as the target rotating speed of the electronic water pump.
And if the engine is determined to have no overheating risk in the second preset data according to the real-time water temperature and the real-time load, inquiring a second rotating speed corresponding to the real-time water temperature and the real-time load in the second preset data, and taking the second rotating speed as a target rotating speed of the electronic water pump so as to increase the cooling flow and avoid overheating of the engine. In the actual vehicle operating condition, based on the real-time water temperature and the real-time load query of the engine, the method aims to confirm the overheating risk under the current finished vehicle transient condition, and set a larger electronic water pump rotating speed for the risk condition after the risk is checked, so that the water temperature of the engine can be controlled at a reasonable lower level, and overheating is avoided. Namely, the rotation speed of the electronic water pump in the second preset data can ensure that the cooling flow is increased to inhibit overheating under the condition that the water temperature of the engine is extremely high, the engine is about to overheat, or the engine load is extremely high, and the engine has an overheating tendency.
For example, the second preset data at least comprises a first interval without overheating risk and a second interval with overheating risk, if the real-time water temperature of the engine is 110 ℃ and the real-time load of the engine is 70%, the real-time water temperature and the real-time load are determined to be in the second interval, the engine has overheating risk, at the moment, a second rotating speed corresponding to the temperature of 110 ℃ and 70% is determined in the second preset data, and the second rotating speed is used as a target rotating speed of the electronic water pump, so that the engine is prevented from overheating; if the real-time water temperature of the engine is 80 ℃, the real-time load of the engine is 40%, the real-time water temperature and the real-time load are determined to be in a first interval, and the engine has no overheating risk, first rotating speeds corresponding to 80 ℃ and 40% are determined in first preset data, and the first rotating speeds are used as target rotating speeds of the electronic water pump, so that the rotating speeds of the electronic water pump are reduced as far as possible under the unnecessary condition, the power consumption is reduced, meanwhile, the heat management requirement is met, and the water temperature is properly increased under the medium-low load condition.
In this embodiment, the second preset data includes a first temperature interval and a second temperature interval, the first temperature interval is 0 ℃ to 99 ℃, the second temperature interval is 100 ℃ to 120 ℃, and the rotation speed value of the electronic water pump corresponding to each temperature interval is only an exemplary description, in other embodiments, the second preset data may further include other temperature intervals, the first temperature interval and the second temperature interval may also be ranges of other temperature intervals, the rotation speed value of the electronic water pump corresponding to each temperature interval may also be other rotation speeds, and details are not repeated herein.
S60: and controlling the electronic water pump according to the target rotating speed.
After the target rotation speed is determined, the electronic water pump is controlled according to the target rotation speed, for example, the target rotation speed may be directly output to the electronic water pump, so that the output rotation speed of the electronic water pump is the target rotation speed obtained by the query.
After the electronic water pump is controlled according to the target rotating speed, the EMS continuously judges the real-time water temperature of the engine, when the real-time water temperature of the engine is found to exceed an overheating temperature threshold value, the EMS considers that the engine has overheating risk, the rotating speed of the electronic water pump is forcibly set to be 100%, namely the flow proportion of the electronic water pump is kept at the maximum value, the heat dissipation function is maintained to be normal, and the engine is ensured not to be overheated.
It can be understood that, due to the thermal inertia of the vehicle cooling system, the water temperature of the engine has the characteristic of slow change, in the transient change process of the normal running of the whole vehicle, the target water temperature of the engine is rapidly switched along with the working condition of the engine, and the actual water temperature of the engine is difficult to follow the change, so that the closed-loop control of the water temperature of the engine is difficult to realize better precision, or other water temperature sensors are additionally arranged at higher cost for auxiliary control to meet the requirement of the closed-loop control; in the open-loop control mode, the rotation speed of the electronic water pump is accurately controlled through two rotation speed data pairs based on a control concept of converting stepless adjustment of the water temperature of the engine into multi-gear subareas, so that multi-gear subarea control of the water temperature of the engine is realized, the control logic design of the electronic water pump is friendly, the logic is simpler, the requirement on the control accuracy is lower, and meanwhile, complicated closed-loop calibration and extra sensor cost do not need to be considered.
In the embodiment, by determining the real-time water temperature of the engine in the vehicle and determining the control mode of the electronic water pump according to the real-time water temperature, if the control mode of the electronic water pump is determined to be the open-loop control mode, the real-time rotating speed and the real-time load of the engine are acquired, determining whether the engine has overheating risk according to the real-time water temperature and the real-time load and second preset data, wherein the second preset data is according to different engine water temperatures and engine loads, the electronic water pump rotating speed data determined after the overheating risk of the engine is evaluated, if the engine is determined not to have the overheating risk, inquiring a real-time rotating speed and a first rotating speed corresponding to a real-time load in first preset data, taking the first rotating speed as a target rotating speed of the electronic water pump, taking the first preset data as the rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine, and controlling the electronic water pump according to the target rotating speed; in the running process of a vehicle, the rotating speed of the electronic water pump is accurately set based on two kinds of rotating speed data, the water temperature of the engine can be set at the optimal level of the steady-state working condition of the engine on the premise of ensuring that the water temperature of the engine is not overheated, and on the premise of meeting the reliability of the water temperature of the engine, the cooling flow is controlled as required, so that the real-time requirement of the engine is met.
In an embodiment, the electronic water pump rotation speed value in the second preset data is set according to the first preset data, specifically, in the second preset data, in the engine water temperature and engine load interval without overheating risk, the electronic water pump rotation speed value corresponding to each engine load is smaller than the electronic water pump rotation speed value corresponding to the engine load in the first preset data; in the engine water temperature and engine load interval with overheating risk, the electronic water pump rotating speed value corresponding to each engine load is larger than the electronic water pump rotating speed value corresponding to the engine load in the first preset data, and the engine is ensured not to have overheating risk. Then, in the running process of the vehicle, the real-time water temperature, the real-time rotating speed and the real-time load of the engine are obtained, second preset data are inquired according to the real-time water temperature and the real-time load, second rotating speed is obtained, first preset data are inquired according to the real-time rotating speed and the real-time load, first rotating speed is obtained, the second rotating speed is compared with the first rotating speed, the larger rotating speed of the second rotating speed and the first rotating speed serves as the target rotating speed of the electronic water pump, the process of judging the engine overheating risk according to the real-time water temperature and the real-time load can be reduced, the repeated inquiry steps are reduced, and on the premise that the reliability is met, the purpose that the engine is at high water temperature is achieved as far as possible, the friction effect is reduced, the working condition of the engine is optimized, and energy conservation and emission reduction are achieved.
In one embodiment, the open-loop control modes include a first open-loop control mode and a second open-loop control mode, as shown in fig. 3, before step S20, that is, before acquiring the real-time speed and the real-time load of the engine, the method further includes the following steps:
SS 21: it is determined whether the real-time water temperature is greater than the first open loop temperature.
In this embodiment, the open-loop control mode is divided into a first open-loop control mode and a second open-loop control mode, and after the control mode of the electronic water pump is determined according to the real-time water temperature of the engine, if the control mode of the electronic water pump is determined to be the open-loop mode, it is further determined whether the control mode of the electronic water pump is the first open-loop control mode or the second open-loop control mode according to the real-time water temperature of the engine, so as to implement different open-loop control strategies.
The first open-loop control mode is a flexible control mode, and is similar to the traditional thermostat in form, that is, the rotation speed of the electronic water pump is mainly related to the real-time water temperature of the engine, and generally needs to conform to the principle that the higher the real-time water temperature is, the higher the rotation speed of the electronic water pump is. In the first open-loop control mode, a small circulation branch in the engine cooling device is opened to a higher level, so that the cooling liquid in the branch can uniformly flow everywhere, at the moment, the engine loses the quick warming effect, but a radiator branch is still not opened, the temperature rise of the water temperature of the engine enters a common level, or the heat balance is maintained in a cold region (no risk exists in the mode). Under the first open-loop control mode, the rotating speed of the electronic water pump is set to be a small rotating speed as far as possible on the premise that the cooling of the system engine is not risky and other functional requirements of the vehicle are met (the cooling flow is larger than that in the warming-up control mode), so that the water temperature of the engine quickly breaks through the first open-loop temperature to enter the second open-loop mode.
Wherein it may be determined whether the real-time water temperature is greater than a first open loop temperature Tc6To determine a specific open-loop control mode.
S22: and if the real-time water temperature is less than or equal to the first open-loop temperature, acquiring the external environment temperature of the vehicle, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature.
And if the real-time water temperature is determined to be less than or equal to the first open-loop temperature, determining to enter a first open-loop control mode, acquiring the external environment temperature of the vehicle at the moment, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature. For example, in order to ensure the performance of the engine, the higher the real-time water temperature of the engine is, the higher the rotation speed of the electronic water pump is, and the lower the ambient temperature is, the lower the rotation speed of the electronic water pump is, under the condition that the ambient temperature is not changed.
S23: and if the real-time water temperature is higher than the first open-loop temperature, acquiring the real-time rotating speed and the real-time load of the engine.
And if the real-time water temperature is determined to be higher than the first open-loop temperature, determining to enter a second open-loop control mode, and acquiring the real-time rotating speed and the real-time load of the engine at the moment so as to control the rotating speed of the electronic water pump according to the acquired real-time rotating speed and the real-time load of the engine, namely realizing the processes from the step S30 to the step S50.
In this embodiment, whether through confirming real-time temperature is greater than first open loop temperature, if real-time temperature is less than or equal to first open loop temperature, then acquire the external ambient temperature of vehicle, and control the rotational speed of electronic water pump according to real-time temperature and ambient temperature, if real-time temperature is for being greater than first open loop temperature, then acquire the real-time rotational speed and the real-time load of engine, divide into first open loop control mode and second open loop control mode with open loop control mode, with the open loop control strategy of carrying out the difference according to different engine temperatures, make the engine temperature more laminate the actual operating mode demand of engine.
In an embodiment, in step S22, controlling the rotation speed of the electronic water pump according to the real-time water temperature and the ambient temperature specifically includes the following steps:
s221: and acquiring third preset data, wherein the third preset data are rotation speed data required by the electronic water pump under different engine water temperatures and external environment temperatures.
S222: inquiring a third rotating speed corresponding to the real-time water temperature and the ambient temperature in third preset data;
s223: and controlling the output rotating speed of the electronic water pump to be a third rotating speed.
The third preset data is the rotating speed data of the electronic water pump required under different engine water temperatures and external environment temperatures. The third preset data is preset electronic water pump rotating speed data, so that in the first open-loop control mode, the third preset data is inquired according to the real-time water temperature and the environment temperature of the engine, and therefore the third rotating speed corresponding to the real-time water temperature and the environment temperature of the engine is obtained and serves as the output rotating speed of the electronic water pump. Wherein the third preset data needs to satisfy the condition: should guarantee that engine cooling does not have the risk, under the prerequisite that other functional requirements of vehicle were satisfied, establish the rotational speed of electronic water pump for a short time as far as possible, still need to open the high level with the little circulation branch road in the engine cooling device, guarantee that the coolant liquid evenly flows everywhere, and the radiator branch road is not opened.
In this embodiment, by acquiring third preset data, the third preset data are rotation speed data of the electronic water pump required by different engine water temperatures and external environment temperatures, a third rotation speed corresponding to the real-time water temperature and the environment temperature is queried in the third preset data, and the output rotation speed of the electronic water pump is controlled to be the third rotation speed, so that a specific implementation process of controlling the rotation speed of the electronic water pump according to the real-time water temperature and the environment temperature is detailed, and a basis is provided for controlling the electronic water pump.
In an embodiment, the real-time water temperature includes a water temperature of a cylinder in an engine cylinder, and the step S50 is to control the rotation speed of the electronic water pump according to the target rotation speed, which specifically includes the following steps:
s51: and acquiring the real-time speed of the vehicle, and acquiring fourth preset data, wherein the fourth preset data is a correction value for correcting the rotating speed of the electronic water pump under different speeds and ambient temperatures.
It should be understood that, in the running process of a vehicle, when the transmission is in different gears, the same engine working condition may correspond to different vehicle speed working conditions, that is, different windward conditions are meant, and different heat dissipation conditions are caused.
In the second open-loop control mode, the water temperature of the engine is high, at the moment, in order to improve the control accuracy of the water temperature of the engine, the real-time speed of the vehicle can be obtained, fourth preset data can be obtained, a correction value is determined according to the real-time speed, the ambient temperature and the fourth preset data of the vehicle, and then the target rotating speed of the electronic water pump is corrected according to the correction value, so that the target rotating speed is optimized, the water temperature of the engine is enabled to be more consistent with the actual working condition of the vehicle, wherein the fourth preset data is the correction value for correcting the rotating speed of the electronic water pump under different speeds and ambient temperatures, namely in the fourth preset data, the real-time speed and the ambient temperature correspond to the rotating speed correction value of one electronic water pump.
S52: and inquiring the correction value corresponding to the real-time vehicle speed and the ambient temperature in the fourth preset data.
In the running process of the vehicle, the real-time vehicle speed, the ambient temperature and fourth preset data of the vehicle need to be acquired, and then the correction value corresponding to the real-time vehicle speed and the ambient temperature is inquired in the fourth preset data so as to correct the target rotating speed.
S53: and correcting the target rotating speed according to the correction value to obtain the corrected rotating speed.
After the real-time speed and the ambient temperature of the vehicle are obtained, the correction value I corresponding to the real-time speed and the ambient temperature can be inquired in the fourth preset data, and then the target rotating speed A is corrected according to the correction value0Correcting to obtain corrected rotation speed AtagThe calculation formula of (2) is as follows: a. thetag＝A0*I。
For example, during the running process of the vehicle, the current real-time vehicle speed is determined to be 60km/h, the ambient temperature is 20 ℃, and the target rotating speed A is determined070 percent, and if the corrected value I corresponding to the vehicle speed of 60km/h and the environmental temperature of 20 ℃ is inquired to be 0.9 in the fourth preset data, the corrected rotating speed is determined to be 56 percent.
In this embodiment, the real-time vehicle speed is 60km/h, the ambient temperature is 20 ℃, and the target rotation speed is 70% only for exemplary illustration, and in other embodiments, the real-time vehicle speed, the ambient temperature, and the target rotation speed may also be other values, which are not described herein again.
S54: and acquiring an external cooling demand outside the engine, and determining the cooling rotating speed of the electronic water pump according to the external cooling demand.
During vehicle operation, there are different cooling requirements, such as external cooling requirements for warm air, transmission oil cooling, etc. While in the second open loop control mode, the engine water temperature is high, and then the external cooling requirement such as cold needs to be considered to distribute different cooling flows, so as to improve the comfort of the vehicle.
Therefore, in the second open-loop control mode, it is necessary to determine whether there is a cooling demand from the outside of the engine, and if external cooling demands such as warm air and transmission oil cooling are received, it is necessary to determine the cooling rotation speed S of the electronic water pump according to the external cooling demand and the real-time water temperature (cylinder head water temperature)reqSo that the current cooling rotational speed SreqWhen satisfying the outside cooling demand, avoid engine cylinder lid overheated.
The calculation formula is as follows: sreq＝f(tempch,Breq) Wherein temp. ischWater temperature of cylinder head, BreqAnd solving the combination of the external cooling requirements, namely the maximum value of the external cooling requirements such as warm air, transmission oil cooling and the like.
S55: and determining the cylinder body rotating speed of the electronic water pump according to the water temperature of the cylinder body.
In addition, because the temperature rise conditions of the engine cylinder head and the engine cylinder body are different, in the second open-loop control mode, the required rotating speed of the engine cylinder body, namely the cylinder body rotating speed of the electronic water pump, is determined according to the water temperature of the cylinder body, and at the moment, the internal memory of the engine cylinder body stores the required rotating speedIn the sensor 2, the proper rotation speed of the electronic water pump and the rotation speed S of the cylinder body need to be set based on the water temperature of the cylinder body of the sensor 2precb＝f(tempcb) Wherein, f (temp)cb) Is controlled by the water temperature temp of the cylindercbA determined function.
S56: and determining the output rotating speed of the electronic water pump according to the corrected rotating speed, the cooling rotating speed and the rotating speed of the cylinder body.
At the determination of the corrected rotational speed AtagCooling speed SreqAnd the cylinder rotation speed SprecbThen, the output rotating speed A of the electronic water pump is determined according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speedfin. For example, directly correcting the rotation speed AtagCooling speed SreqAnd the cylinder rotation speed SprecbThe maximum rotating speed is taken as the output rotating speed A of the electronic water pumpfinThe water temperature of the engine is maintained in a higher temperature range, the problem of engine oil dilution can be solved, the working condition of the engine is optimized, and the effects of oil saving and emission reduction are effectively realized.
In the embodiment, the real-time vehicle speed of the vehicle is obtained, fourth preset data is obtained, the fourth preset data is a corrected value for correcting the rotating speed of the electronic water pump under different vehicle speeds and different ambient temperatures, the corrected value corresponding to the real-time vehicle speed is inquired in the fourth preset data, the target rotating speed is corrected according to the corrected value, the corrected rotating speed is obtained, the external cooling requirement outside the engine is obtained, the cooling rotating speed of the electronic water pump is determined according to the external cooling requirement, the cylinder rotating speed of the electronic water pump is determined according to the cylinder water temperature, the output rotating speed of the electronic water pump is determined according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speed, the step of controlling the electronic water pump according to the target rotating speed is refined, in the second open-loop control mode, the influence of the vehicle speed and the ambient temperature on the engine water temperature is considered, the rotating speed of the electronic water pump is further corrected, the cooling requirements of other cooling systems and the rotating speed requirement of the engine cylinder are also considered, on the premise of meeting the functional requirements of warm air comfort and the like, the accuracy of the target rotating speed is improved, and the accurate control of the water temperature of the engine is further improved.
In an embodiment, in step S56, determining the output rotation speed of the electronic water pump according to the corrected rotation speed, the cooling rotation speed and the cylinder rotation speed includes the following steps:
s561: and determining the maximum rotation speed in the correction rotation speed, the cooling rotation speed and the cylinder rotation speed.
At the determined corrected rotation speed AtagCooling speed SreqAnd the cylinder rotation speed SprecbAfter that, the rotational speed A also needs to be correctedtagCooling speed SreqAnd the cylinder rotation speed SprecbOf the rotational speed of the motor.
S562: and acquiring fifth preset data, wherein the fifth preset data is the rotating speed range of the electronic water pump at different engine water temperatures.
Meanwhile, fifth preset data are required to be obtained, and a rotating speed range corresponding to the water temperature of the cylinder body is determined in the fifth preset data, wherein the fifth preset data are rotating speed ranges calibrated by the electronic water pump at different engine water temperatures.
S563: and determining the rotating speed range of the electronic water pump under the water temperature of the cylinder body in the fifth preset data.
Before the fifth preset data are obtained, the rotating speed range of the electronic water pump under the water temperature of the cylinder body is determined in the fifth preset data.
S564: and determining whether the maximum rotating speed is in a rotating speed range of the electronic water pump at the water temperature of the cylinder body.
And after the rotating speed range of the electronic water pump under the water temperature of the cylinder body is determined in the fifth preset data, determining whether the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body.
S565: and if the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, determining the output rotating speed of the electronic water pump as the maximum rotating speed.
If the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, the electronic water pump outputs a corrected rotating speed AtagCooling speed SreqAnd the cylinder rotation speed SprecbAfter the maximum rotating speed is in the middle, the water temperature of the engine changes normally, the condition of overheating or supercooling can not occur, and at the moment, the output rotating speed of the electronic water pump is determined to be the correction rotating speed AtagCooling speed SreqAnd cylinder rotational speedSprecbMaximum rotational speed of (1); if the maximum rotating speed is not in the rotating speed range of the electronic water pump at the water temperature of the cylinder body, the electronic water pump outputs a corrected rotating speed AtagCooling rotational speed SreqAnd the cylinder rotation speed SprecbAfter the maximum rotation speed, the temperature of the engine water changes sharply, and overheating or overcooling may occur, and at this time, the correction rotation speed a needs to be determinedtagCooling rotational speed SreqAnd the cylinder rotation speed SprecbIf the maximum rotating speed is larger than the maximum value corresponding to the rotating speed range under the water temperature of the cylinder body or is smaller than the minimum value corresponding to the rotating speed range under the water temperature of the cylinder body, if the rotating speed A is correctedtagCooling speed SreqAnd the cylinder rotation speed SprecbIf the maximum rotating speed is larger than the maximum corresponding to the rotating speed range under the water temperature of the cylinder body, taking the maximum corresponding to the rotating speed range as the output rotating speed of the electronic water pump; if the rotational speed A is correctedtagCooling speed SreqAnd the cylinder body rotating speed SprecbAnd if the maximum rotating speed is less than the minimum corresponding to the rotating speed range under the water temperature of the cylinder body, taking the minimum corresponding to the rotating speed range under the water temperature of the cylinder body as the output rotating speed of the electronic water pump.
For example, if the cylinder water temperature of the engine is 60 ℃, the rotation speed range corresponding to 60 ℃ in the fifth preset data is 50% -60%, if the rotation speed A is correctedtagCooling speed SreqAnd the cylinder body rotating speed SprecbThe maximum rotation speed of (1) is 55%, the corrected rotation speed A is determinedtagCooling speed SreqAnd the cylinder rotation speed SprecbThe maximum rotating speed of the electronic water pump is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, and 55 percent of the maximum rotating speed is taken as the output rotating speed of the electronic water pump; if the rotational speed A is correctedtagCooling speed SreqAnd the cylinder body rotating speed SprecbThe maximum rotational speed of (1) is 45%, the corrected rotational speed A is determinedtagCooling speed SreqAnd the cylinder rotation speed SprecbThe maximum rotating speed of the electronic water pump is not in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, and 50% of the maximum rotating speed is taken as the output rotating speed of the electronic water pump; if the rotational speed A is correctedtagCooling speed SreqAnd the cylinder rotation speed SprecbThe maximum rotating speed is 65%, the correction is determinedPositive rotational speed AtagCooling speed SreqAnd the cylinder rotation speed SprecbThe maximum rotating speed of the electronic water pump is not within the rotating speed range of the electronic water pump under the water temperature of the cylinder body, and 60% of the maximum rotating speed is used as the output rotating speed of the electronic water pump, so that the situation that the rotating speed of the electronic water pump is too high or too low, and the water temperature of an engine is not in line with the actual requirement is avoided.
In this embodiment, the water temperature of the cylinder of the engine is 60 ℃, and the rotation speed range corresponding to the water temperature of the cylinder in the fifth preset data is 50% to 60% only by way of example, in other embodiments, the real-time water temperature of the engine and the rotation speed range corresponding to the water temperature of the cylinder in the fifth preset data may be other values, which are not described herein again.
In this embodiment, the fifth preset data is obtained by determining the maximum rotation speed of the correction rotation speed, the cooling rotation speed and the cylinder body rotation speed, the rotation speed range of the electronic water pump at the real-time cylinder body water temperature is determined in the fifth preset data, whether the maximum rotation speed correction rotation speed is in the rotation speed range of the electronic water pump at the real-time cylinder body water temperature is determined, if the maximum rotation speed correction rotation speed is in the rotation speed range of the electronic water pump at the cylinder body water temperature, the output rotation speed of the electronic water pump is determined to be the maximum rotation speed correction rotation speed, the specific step of determining the output rotation speed of the electronic water pump according to the correction rotation speed, the cooling rotation speed and the cylinder body rotation speed is refined, the output rotation speed of the electronic water pump is ensured not to exceed the rotation speed range corresponding to the current cylinder body water temperature, and the accuracy of controlling the engine water temperature is further improved.
In an embodiment, after step S10, that is, after determining the control mode of the electronic water pump according to the real-time water temperature, the method further includes the following steps:
s11: and if the control mode of the electronic water pump is determined to be the warming control mode, determining whether the water temperature of the cylinder body in the real-time water temperature is lower than a first preset temperature, wherein the water temperature in the warming control mode is lower than that in the open-loop control mode.
After the whole vehicle is powered on, the EMS reads real-time water temperature (including cylinder cover water temperature and cylinder body water temperature) of the engine and judges the real-time water temperature according to a cold start threshold value in a control mode, when the cylinder cover water temperature of the engine is greater than the cylinder cover cold start threshold value or the cylinder body water temperature of the engine is greater than the cylinder body cold start threshold value, the engine is considered to be in hot start, the electronic water pump enters a normal working mode (including an open-loop control mode and a closed-loop control mode), when the cylinder cover water temperature is less than or equal to the cylinder cover cold start threshold value and the cylinder body water temperature of the engine is less than or equal to the cylinder body cold start threshold value, the engine is considered to be in the cold start mode, and in the cold start mode, the electronic water pump realizes one of main functions of the cold start mode, namely needs to warm up the engine, and then is controlled to enter a warm-up control mode.
The control mode of the warming machine controls the rotating speed of the electronic water pump, aims to enable the wall temperature, the engine oil temperature and the water temperature in the engine to rise rapidly, and comprises a zero flow mode, an ultra-low flow mode and a low flow mode in the warming control mode so as to divide the warming process of the engine into a plurality of stages such as zero flow, ultra-low flow and low flow.
S12: and if the water temperature of the cylinder body is lower than the first preset temperature, controlling the output rotating speed of the electronic water pump to be the first warming-up rotating speed.
After determining whether the water temperature of the cylinder body is smaller than a first preset temperature, if the water temperature of the cylinder body is smaller than the first preset temperature, the engine temperature is low, and the engine temperature is possibly in a cold area, a zero-flow mode is entered, the rotating speed of the electronic water pump is controlled to be a first warming rotating speed at the moment, wherein the first warming rotating speed is 0%, namely the rotating speed position of the electronic water pump is a fully-off position, zero-flow warming is carried out, all heat in the engine is locked inside, the wall temperature is rapidly increased, the engine oil temperature is rapidly increased, and the problem that dilution occurs due to the fact that the engine oil temperature in the cold area is too low for a long time is solved. Because the main oil gallery and the oil pan are both arranged at the lower part of the engine, the rapid temperature rise of the cylinder body is taken as the main part in the stage, and because the water temperature of the cylinder body of the engine is lower, the cooling liquid flow of the whole engine can be cut off, so that the engine without the cooling effect can be rapidly heated, and the engine exits from the zero flow mode and enters into the ultra-low flow mode until the water temperature of the cylinder body is greater than or equal to a first preset temperature.
S13: and if the water temperature of the cylinder body is greater than or equal to the first preset temperature, determining whether the water temperature of the cylinder body is greater than the second preset temperature.
After determining whether the water temperature of the cylinder body is less than the first preset temperature, if the water temperature of the cylinder body is greater than or equal to the first preset temperature, determining whether the water temperature of the cylinder body is greater than the second preset temperature.
S14: and if the water temperature of the cylinder body is less than or equal to the second preset temperature, controlling the output rotating speed of the electronic water pump to be the second warming-up rotating speed.
If the cylinder body water temperature is greater than or equal to the first preset temperature, and the cylinder body water temperature is less than or equal to the second preset temperature, the temperature is reasonable, but the temperature of opening the cylinder body branch is not reached, the ultra-low flow mode is entered, the rotating speed of the electronic water pump is controlled to be the second warming-up rotating speed, the second warming-up rotating speed is greater than the first warming-up rotating speed, and the ultra-low flow stage is entered. In the ultra-low flow stage, the temperature of engine oil of an engine enters a reasonable range, the water temperature and the wall temperature of the engine rise rapidly, if the engine continues to be in a zero flow state at the moment, the water temperature sensor at the water outlet of a cylinder cover cannot obtain the correct water temperature of the engine due to the fact that the water temperature sensor is arranged outside the engine, the reliability cannot be guaranteed, temperature difference exists between cold water and hot water inside and outside the engine during zero flow, the water temperature of each part in a branch is not uniform, the rotating speed of an electronic water pump needs to be controlled to be the second warming rotating speed at the moment, the ultra-low flow is used for responding, until the water temperature of a cylinder body of the engine reaches the third preset temperature, the ultra-low flow mode exits, and the low flow stage is entered.
In the ultra-low flow mode, the electronic water pump operates at the lowest rotating speed, so that the interior of the engine is maintained at the ultra-low flow, the temperature of the cooling liquid is kept uniform, meanwhile, the radiator is kept closed, at the moment, the heat is uniformly distributed in the whole small circulation but is not dissipated outwards, and the rapid warming-up can be accelerated; if the temperature control module is used in the engine cooling device, the opening of the temperature control module is set at a minimum position, so that only a small flow (such as a flow of about 1L/min) is maintained in the engine cooling device, and at the moment, the cylinder block is completely closed, but a slight flow is maintained in the cylinder head, and the slight flow passes through a small circulation and does not pass through a radiator; if a thermostat is used in the engine cooling device, the cylinder is completely closed and the small circulation is fully opened.
S15: and if the water temperature of the cylinder body is higher than the second preset temperature, determining a third warming-up rotating speed of the electronic water pump according to the water temperature of the cylinder body, and controlling the output rotating speed of the electronic water pump to be the third warming-up rotating speed.
In the engine warming-up process, if the water temperature of the cylinder body is greater than or equal to a second preset temperature, the existing effect of warming-up is shown, at the moment, the heat in the cylinder body is gathered to a certain degree, overheating inhibition needs to be considered, at the moment, the warming-up stage is close to the end sound, a low-flow mode is entered, the rotating speed of the electronic water pump needs to be gradually increased, and the rotating speed S is enabled to be increasedwarmup＝f(tempcb) Wherein temp. iscbIs the cylinder temperature. Meanwhile, if the temperature control module is used in the engine cooling device, the opening degree of the temperature control module needs to be gradually increased to open the cylinder branch, and the opening degree P of the temperature control modulecbtmm＝f(tempcb)，tempcbThe water temperature of the cylinder body in the engine cylinder body; if the engine cooling device is matched with a thermostat, the cylinder branch is completely opened. And after that, continuously judging the cylinder temperature and the cylinder cover temperature of the engine until the low-flow mode is exited to enter an open-loop control mode.
In this embodiment, if the control mode of the electronic water pump is determined to be the warming control mode, it is determined whether the real-time water temperature of the cylinder water temperature in the real-time water temperature is less than a first preset temperature, the water temperature in the warming control mode is lower than the water temperature in the open-loop control mode, if the real-time water temperature of the cylinder water temperature is less than the first preset temperature, the output rotation speed of the electronic water pump is controlled to be the first warming rotation speed, and timing is performed, if the real-time water temperature of the cylinder water temperature is greater than or equal to the first preset temperature, it is determined whether the cylinder water temperature is greater than a second preset temperature, if the real-time water temperature is less than or equal to the second preset temperature, or if the timing duration is greater than the first preset duration, the output rotation speed of the electronic water pump is controlled to be the second warming rotation speed, and if the cylinder water temperature is greater than the second preset temperature, then confirm the third warm-up rotational speed of electronic water pump according to cylinder body temperature, and the output rotational speed of control electronic water pump is third warm-up rotational speed, specific control process to electronic water pump rotational speed in the warm-up control mode has been clarified, divide into zero flow with the engine warm-up stage, the three stage of ultralow flow and low discharge, can satisfy the cooling demand of different periods, under the prerequisite that satisfies functional requirements such as warm braw travelling comfort, the problem of machine oil dilution is solved, under the prerequisite that effectively satisfies the reliability, realize cooling flow and control as required, and then realized the effect of reducing emission that economizes on fuel.
In an embodiment, after step S14, that is, after the output rotation speed of the electronic water pump is controlled to be the second warming-up rotation speed, the method further includes the following steps:
s141: and determining whether the water temperature of the cylinder cover in the real-time water temperature is greater than a third preset temperature, wherein the third preset temperature is less than the second preset temperature and greater than the first preset temperature.
After the output rotating speed of the electronic water pump is controlled to be the second warming-up rotating speed, the EMS needs to determine whether the water temperature of the cylinder cover in the real-time water temperature is greater than a third preset temperature, wherein the third preset temperature is smaller than the second preset temperature and greater than the first preset temperature, namely, whether the water temperature of the cylinder cover is greater than the third preset temperature needs to be determined in the ultralow flow stage.
S142: and if the water temperature of the cylinder cover is higher than the third preset temperature, determining whether an external cooling demand outside the engine is received.
After determining whether the water temperature of the cylinder cover is greater than the third preset temperature, in an ultra-low flow stage, if the water temperature of the cylinder cover is greater than the third preset temperature, it is determined whether external cooling demands from the outside of the engine, such as external cooling demands of warm air, transmission oil cooling and the like, are received.
S143: and if the external cooling requirement outside the engine is received, determining the cooling rotating speed of the electronic water pump according to the external cooling requirement.
At quick warm-up initial stage because of the temperature is low excessively, if respond to other branch road demands, flow into other systems, for example, cool off EGR and will cause condensation phenomenon, do not have any effect in reality like getting into the warm-air system, but when the temperature is higher than the threshold value, preliminarily possess the meaning, can begin to consider the function of other systems, the travelling comfort, after confirming that cylinder cap temperature is greater than the third and predetermines the temperature, if there is not external cooling demand this moment, then continue to maintain ultra-low flow, electronic pump's output rotational speed still is the second warm-up rotational speed of ultralow flow mode, if there is the external cooling demand, then confirm electronic pump's cooling rotational speed according to the external cooling demand, make electronic pump's cooling flow can satisfy the external cooling demand.
S144: and determining the fourth heating rotating speed of the electronic water pump according to the water temperature of the cylinder body and the cooling rotating speed.
After the cooling rotating speed of the electronic water pump is determined according to the external cooling requirement, a fourth warming rotating speed of the electronic water pump is determined according to the water temperature of the cylinder body and the cooling rotating speed. Wherein the fourth warm-up rotation speed S of the electronic water pumpwarmup＝f(tempch,Breq) Wherein temp. ischWater temperature of cylinder head, BreqThe combined solution for the external cooling requirement is the maximum among the requirements of warm air, transmission oil cooling, etc.
S145: and controlling the output rotating speed of the electronic water pump to be a fourth warming-up rotating speed.
Determining the fourth warm-up rotation speed S of the electronic water pumpwarmupAnd then, controlling the output rotating speed of the electronic water pump to be a fourth heating rotating speed so as to ensure the temperature rise of the engine and solve the problem of engine oil dilution on the premise of meeting the functional requirements of warm air comfort and the like. In addition, if the temperature control module is used in collocation of the engine cooling device, the opening degree of the temperature control module also needs to be gradually adjusted, the opening degree is adjusted to the position meeting the external cooling requirement, if the thermostat is used in collocation of the engine cooling device, the cylinder block branch is guaranteed to be completely closed at the moment, the small circulation branch on the cylinder cover is fully opened, and then the cylinder block temperature in the engine cylinder block is continuously judged until the engine cooling device exits from the heater control mode and enters into the open-loop control mode.
In this embodiment, after controlling the output rotation speed of the electronic water pump to be the second warming-up rotation speed, it is determined whether the cylinder head water temperature among the real-time water temperatures is greater than a third preset temperature, and if the cylinder head water temperature is greater than the third preset temperature, determining whether an external cooling demand outside the engine is received, determining a cooling rotation speed of the electronic water pump according to the external cooling demand if the external cooling demand outside the engine is received, determining the fourth heating rotating speed of the electronic water pump according to the water temperature of the cylinder body and the cooling rotating speed, controlling the output rotating speed of the electronic water pump to be the fourth heating rotating speed, during the ultra-low flow phase of warming up the engine, the external cooling requirements of other systems are taken into account, on the premise of meeting the functional requirements of warm air comfort and the like, the problem of engine oil dilution is solved, on the premise of effectively meeting the reliability, the cooling flow is controlled as required, and further the effects of oil saving and emission reduction are realized.
In an embodiment, after step S15, that is, after the output rotation speed of the electronic water pump is controlled to be the third warming-up rotation speed, the method further includes the following steps:
s151: the method comprises the steps of obtaining the ambient temperature of a vehicle, and determining whether the ambient temperature is smaller than a preset ambient temperature.
After the output rotation speed of the electronic water pump is controlled to be the third warming-up rotation speed, namely in the low-flow mode, the engine water temperature is rapidly increased, the warming-up control mode needs to be exited to avoid the situation that the water temperature is too high, and the next control mode is entered. Wherein, the electric water pump can exit the heater control mode under two conditions: the first is that under the ordinary condition, the engine EMS continuously judges whether the real-time water temperature (including cylinder cover water temperature and cylinder body water temperature) exceeds the cold start threshold, when the cylinder cover water temperature threshold is higher than the cylinder cover cold start threshold, or the cylinder body water temperature is higher than the cylinder cover cold start threshold, the engine EMS exits from the heater control mode, at this moment, the use of ultralow flow is prohibited, and the cooling flow of the electronic water pump needs to be gradually increased along with the rise of the real-time water temperature so as to avoid the overheating of the engine.
The second kind is mainly used for dealing with the cold district, because the cold district temperature is lower, it is very big to face the windward heat dissipation capacity after the whole car goes, there is the difficulty in the heat gathering, consequently the engine water temperature is in lower level easily and can't rise, probably be in the heat balance state, last this moment prescribe a limit to the electron water pump at minimum rotational speed probably arouses other problems easily (engine compartment, cylinder body cylinder cap all no longer be the cold state in this moment, the low discharge probably can't guarantee that the temperature field is even, local hot spot exists, it does not have the risk completely, and other function branch roads probably need large-traffic, if maintain the low discharge for a long time, then other function branch roads can't be satisfied). Therefore, in the low flow mode, the ambient temperature of the vehicle is obtained, and whether the ambient temperature is lower than the preset ambient temperature or not is determined, that is, whether the vehicle is in a cold region or not is determined, so that a warm-up control mode exit strategy of the cold region is executed in the cold region.
S152: and if the ambient temperature is lower than the preset ambient temperature, determining whether the water temperature of the cylinder cover in the real-time water temperature is higher than a fourth preset temperature, wherein the fourth preset temperature is lower than the first open-loop temperature.
After determining whether the ambient temperature is less than the preset ambient temperature, if the ambient temperature is less than the preset ambient temperature, it is determined that the vehicle is in a cold area, and because the vehicle may have a thermal balance condition in the cold area, the real-time water temperature of the engine reaches a set cold start threshold, and at this time, it is required to determine whether the water temperature of a cylinder cover in the real-time water temperature is greater than a fourth preset temperature. Wherein the fourth preset temperature is less than the first open loop temperature.
If the ambient temperature is greater than or equal to the preset ambient temperature, the vehicle is determined not to be in a cold area, the warm-up time does not need to be limited at the moment, and the warm-up control mode is normally judged to be exited according to the temperature rise condition of the engine.
S153: and if the water temperature of the cylinder cover is higher than the fourth preset temperature, timing, and inquiring the warming-up time corresponding to the ambient temperature in sixth preset data.
If the water temperature of the cylinder cover is higher than the fourth preset temperature, timing the time that the water temperature of the cylinder cover is higher than the fourth preset temperature is needed to avoid overheating of the cylinder cover, and the warming-up time corresponding to the ambient temperature is inquired in sixth preset data. And the sixth preset data is the allowable warm-up time of the electronic water pump calibrated at the ambient temperature. Can carry out real vehicle environment test to the vehicle to the longest warm-up duration (being warm-up restriction duration) of demarcation engine under different ambient temperature thereby obtain the sixth preset data, in the sixth preset data, different ambient temperature corresponds has different warm-up restriction duration, in order to guarantee the accuracy of warm-up restriction duration.
S154: and if the timing duration is longer than the warming-up duration corresponding to the environment temperature, determining that the control mode of the electronic water pump is an open-loop control mode.
When the timing duration is longer than the warming duration corresponding to the environment temperature, which indicates that the engine is overheated due to continuous warming, the control mode of the warming machine needs to be exited, and the open-loop control mode is entered.
In this embodiment, after controlling the output rotation speed of the electronic water pump to be the third warming-up rotation speed, it is required to obtain the ambient temperature of the vehicle, and determine whether the ambient temperature is less than the preset ambient temperature, if the ambient temperature is less than the preset ambient temperature, determine whether the cylinder head water temperature in the real-time water temperature is greater than the fourth preset temperature, the fourth preset temperature is less than the first open-loop temperature, if the cylinder head water temperature is greater than the fourth preset temperature, time is counted, and a warming-up duration corresponding to the ambient temperature is queried in the sixth preset data, if the counted duration is greater than the warming-up duration corresponding to the ambient temperature, determine that the control mode of the electronic water pump is the open-loop control mode, after entering the warming-up control mode, a specific strategy for exiting the warming-up control mode is determined, a strategy for exiting the warming-up in advance based on the environmental factors is defined for the warming-up stage, and can cope with the special situation of the cold area, the two warm-up exiting strategies ensure normal warm-up of the engine and normal use of the vehicle.
In one embodiment, if two water temperature sensors are included in the engine cooling device: a sensor 1 at the water outlet of the engine cylinder cover and a sensor 2 in the engine cylinder body. When the two water temperature sensors are normal, the water temperature of the cylinder cover, which is obtained by detecting the sensor 1 at the water outlet of the engine cylinder cover, is used as a judgment basis of a water temperature threshold value in an open-loop control mode and overheating judgment of the cylinder cover; the sensor 2 in the engine block detects the obtained block water temperature as a basis for judgment of the water temperature threshold in the warm-up control mode and judgment of overheating at the block. The purpose of setting up sensor 2 in the engine cylinder body is mainly because cylinder body, cylinder cap reposition of redundant personnel, can adjust cylinder body, cylinder cap flow respectively and influence under the condition of engine water temperature at two thermostats or temperature control module, and the temperature in two regions does not have strong correlation, needs two temperature sensor to detect alone.
After the whole vehicle is powered on, the two water temperature sensors need to be checked to judge faults, the judging mode of the faults of the water temperature sensors can be determined by a vehicle ECU (electronic control Unit), the ECU can judge according to water temperature signals of the water temperature sensors, if any fault of the maximum fault, the minimum fault and the unreasonable signal fault of the water temperature sensors is determined according to the water temperature signals, the situation that the engine cannot judge the water temperature condition is not indicated, and an alarm prompt needs to be sent to prompt a user of the faults of the water temperature sensors.
When the sensor 1 at the water outlet of the engine cylinder cover fails, the judgment reference of all water temperature thresholds loses effect, so that the user can know the failure condition by directly alarming, the rotating speed of the electronic water pump is adjusted to 100 percent, namely the flow proportion of the water pump is kept at the highest value, the heat dissipation function is maintained to be normal, and the engine is ensured not to be overheated; if a fault of the sensor 2 in the engine cylinder is found, in a control mode of the heater, namely in a warming-up stage of the engine, a stage of fully closing a cylinder body branch is required to be abandoned, the rotation speed setting of the electronic water pump based on the water temperature of the cylinder body is cancelled, the rotation speed of the electronic water pump is required to be controlled according to the water temperature of a cylinder cover, the electronic water pump maintains a small rotation speed in an ultra-low flow mode to ensure the circulation of the cooling flow of the cylinder cover (the stage of fully closing the cylinder body and the cylinder cover is not needed at this moment), when the water temperature of the cylinder cover exceeds a certain temperature, the control mode of the heater is exited, after the control mode of the heater is exited, the lower limit of the rotation speed of the electronic water pump is required to ensure that the cylinder body is fully opened, and in a subsequent first open-loop control mode and a subsequent first open-loop control mode, the rotation speed control of the electronic water pump based on the water temperature of the cylinder body is abandoned.
In one embodiment, the first preset data, the second preset data, the third preset data, the fourth preset data, the fifth preset data and the sixth preset data are all formulated into a two-dimensional table to form a first preset table, a second preset table, a third preset table, a fourth preset table, a fifth preset table and a sixth preset table, and the first preset table, the second preset table, the third preset table, the fourth preset table, the fifth preset table and the sixth preset table are stored in the vehicle, so that in the running process of the vehicle, the corresponding preset tables can be directly inquired according to corresponding parameters of the real-time water temperature, the real-time rotating speed, the real-time load, the ambient temperature and the like of the engine, the inquiry time is reduced, the response speed of the electronic water pump is improved, and the fine control of the cooling flow is further improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In one embodiment, an electronic water pump control device for an engine is provided, and the electronic water pump control device for the engine corresponds to the electronic water pump control methods for the engine in the above embodiments one to one. As shown in FIG. 4, the engine electronic water pump control device includes a first determination module 401, an acquisition module 402, a second determination module 403, a query module 404, and a control module 405. The functional modules are explained in detail as follows:
the first determination module 401 is used for determining real-time water temperature of an engine in a vehicle and determining a control mode of the electronic water pump according to the real-time water temperature;
an obtaining module 402, configured to obtain a real-time rotation speed and a real-time load of the engine if it is determined that a control mode of the electronic water pump is an open-loop control mode;
a second determination module 403 for determining whether the engine is at risk of overheating according to the real-time water temperature and the real-time load;
the query module 404 is configured to query, if it is determined that the engine has no overheating risk, the real-time rotational speed and a first rotational speed corresponding to the real-time load in first preset data, and use the first rotational speed as a target rotational speed of the electronic water pump, where the first preset data is rotational speed data calibrated by the electronic water pump under an engine steady-state working condition;
and the control module 405 is used for controlling the electronic water pump according to the target rotating speed.
Further, after determining whether the engine is at risk of overheating according to the real-time water temperature and a second preset data, the query module 404 is further configured to:
and if the engine is determined to have overheating risks, inquiring second rotating speed corresponding to the real-time water temperature and the real-time load in second preset data, and taking the second rotating speed as the target rotating speed of the electronic water pump, wherein the second preset data are electronic water pump rotating speed data determined after the overheating risks of the engine are evaluated according to different engine water temperatures and engine loads.
Further, before the real-time rotational speed and the real-time load of the engine are obtained, the control module 405 is further specifically configured to:
determining whether the real-time water temperature is greater than a first open loop temperature;
if the real-time water temperature is less than or equal to the first open-loop temperature, acquiring the external environment temperature of the vehicle, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature;
and if the real-time water temperature is higher than the first open-loop temperature, acquiring the real-time rotating speed and the real-time load of the engine.
Further, the control module 405 is further specifically configured to:
acquiring third preset data, wherein the third preset data are rotation speed data required by the electronic water pump under different engine water temperatures and external environment temperatures;
inquiring a third rotating speed corresponding to the real-time water temperature and the ambient temperature in the third preset data;
and controlling the output rotating speed of the electronic water pump to be the third rotating speed.
Further, the real-time water temperature includes a water temperature of a cylinder in the engine cylinder, and the control module 405 is specifically configured to:
acquiring the real-time speed of the vehicle, and acquiring fourth preset data, wherein the fourth preset data is a corrected value for correcting the rotating speed of the electronic water pump at different speeds and ambient temperatures;
inquiring a correction value corresponding to the real-time vehicle speed in the fourth preset data;
correcting the target rotating speed according to the correction value to obtain a corrected rotating speed;
acquiring an external cooling demand outside the engine, and determining the cooling rotating speed of the electronic water pump according to the external cooling demand;
determining the cylinder body rotating speed of the electronic water pump according to the water temperature of the cylinder body;
and determining the output rotating speed of the electronic water pump according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speed.
Further, the control module 405 is specifically configured to:
determining a maximum rotation speed among the correction rotation speed, the cooling rotation speed and the cylinder rotation speed;
acquiring fifth preset data, wherein the fifth preset data is the rotating speed range of the electronic water pump under different engine water temperatures;
determining the rotating speed range of the electronic water pump under the water temperature of the cylinder body in the fifth preset data;
determining whether the maximum rotating speed is in a rotating speed range of the electronic water pump at the water temperature of the cylinder body;
and if the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, determining the output rotating speed of the electronic water pump as the maximum rotating speed.
Further, after determining the control mode of the electronic water pump according to the real-time water temperature, the control module 405 is further specifically configured to:
if the control mode of the electronic water pump is determined to be a warming control mode, determining whether the water temperature of the cylinder body in the real-time water temperature is lower than a first preset temperature, wherein the water temperature of the warming control mode is lower than that of the open-loop control mode;
if the water temperature of the cylinder body is lower than the first preset temperature, controlling the output rotating speed of the electronic water pump to be a first warming rotating speed;
if the water temperature of the cylinder body is greater than or equal to the first preset temperature, determining whether the water temperature of the cylinder body is greater than a second preset temperature;
if the water temperature of the cylinder body is less than or equal to the second preset temperature, controlling the output rotating speed of the electronic water pump to be a second warming-up rotating speed;
and if the water temperature of the cylinder body is higher than the second preset temperature, determining a third warming-up rotating speed of the electronic water pump according to the water temperature of the cylinder body, and controlling the output rotating speed of the electronic water pump to be the third warming-up rotating speed.
Further, after the output rotation speed of the electronic water pump is controlled to be the second warming-up rotation speed, the control module 405 is further specifically configured to:
determining whether the water temperature of a cylinder cover in the real-time water temperature is greater than a third preset temperature, wherein the third preset temperature is less than the second preset temperature and greater than the first preset temperature;
if the water temperature of the cylinder cover is higher than the third preset temperature, determining whether an external cooling demand outside the engine is received;
if an external cooling demand outside the engine is received, determining the cooling rotating speed of the electronic water pump according to the external cooling demand;
determining a fourth warming-up rotating speed of the electronic water pump according to the water temperature of the cylinder body and the cooling rotating speed;
and controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed.
Further, after the output rotation speed of the electronic water pump is controlled to be the third warming-up rotation speed, the control module 405 is further specifically configured to:
acquiring the ambient temperature of the vehicle, and determining whether the ambient temperature is less than a preset ambient temperature;
if the environment temperature is lower than the preset environment temperature, determining whether the cylinder cover water temperature in the real-time water temperature is higher than a fourth preset temperature which is lower than a first open-loop temperature;
if the water temperature of the cylinder cover is higher than the fourth preset temperature, timing, and inquiring the warming-up time corresponding to the environment temperature in sixth preset data;
and if the timing duration is longer than the warming-up duration corresponding to the environment temperature, determining that the control mode of the electronic water pump is an open-loop control mode.
For specific definition of the engine electronic water pump control device, reference may be made to the definition of the engine electronic water pump control method above, and details are not described here. All or part of each module in the electronic water pump control device of the engine can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, as shown in fig. 5, an electronic engine water pump control device is provided, which includes a processor, a memory connected by a system bus. The processor of the engine electronic water pump control device is used for providing calculation and control capacity. The memory of the engine electronic water pump control device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The computer program is executed by a processor to implement an engine electronic water pump control method.
In one embodiment, an electronic water pump control device for an engine is provided, which includes a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the electronic water pump control method for the engine when executing the computer program.
In one embodiment, a readable storage medium is provided, having a computer program stored thereon, the computer program, when executed by a processor, implementing the steps of the engine electronic water pump control method described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules, so as to perform all or part of the above described functions.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims (10)

1. An electronic water pump control method for an engine is characterized by comprising the following steps:
determining real-time water temperature of an engine in a vehicle, and determining a control mode of an electronic water pump according to the real-time water temperature;
if the control mode of the electronic water pump is determined to be an open-loop control mode, acquiring the real-time rotating speed and the real-time load of the engine;
determining whether the engine has overheating risks or not according to the real-time water temperature and the real-time load;
if the engine is determined to have no overheating risk, inquiring the real-time rotating speed and a first rotating speed corresponding to the real-time load in first preset data, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data are rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine;
and controlling the electronic water pump according to the target rotating speed.
2. The engine electric water pump control method according to claim 1, after determining whether the engine is at risk of overheating based on the real-time water temperature and second preset data, the method further comprising:
and if the engine is determined to have overheating risks, inquiring second rotating speed corresponding to the real-time water temperature and the real-time load in second preset data, and taking the second rotating speed as the target rotating speed of the electronic water pump, wherein the second preset data are electronic water pump rotating speed data determined after the overheating risks of the engine are evaluated according to different engine water temperatures and engine loads.
3. The engine electronic water pump control method of claim 1, wherein before the obtaining the real-time speed and the real-time load of the engine, the method further comprises:
determining whether the real-time water temperature is greater than a first open loop temperature;
if the real-time water temperature is less than or equal to the first open-loop temperature, acquiring the external environment temperature of the vehicle, and controlling the rotating speed of the electronic water pump according to the real-time water temperature and the environment temperature;
and if the real-time water temperature is higher than the first open-loop temperature, acquiring the real-time rotating speed and the real-time load of the engine.
4. The engine electronic water pump control method according to claim 3, wherein the controlling the rotation speed of the electronic water pump according to the real-time water temperature and the ambient temperature includes:
acquiring third preset data, wherein the third preset data are rotation speed data required by the electronic water pump under different engine water temperatures and external environment temperatures;
inquiring a third rotating speed corresponding to the real-time water temperature and the ambient temperature in the third preset data;
and controlling the output rotating speed of the electronic water pump to be the third rotating speed.
5. The electronic water pump control method for the engine according to claim 1, wherein the real-time water temperature includes a water temperature of a cylinder in the engine block, and the controlling the electronic water pump according to the target rotation speed includes:
acquiring the real-time speed of the vehicle, and acquiring fourth preset data, wherein the fourth preset data is a corrected value for correcting the rotating speed of the electronic water pump at different speeds and ambient temperatures;
inquiring a correction value corresponding to the real-time vehicle speed in the fourth preset data;
correcting the target rotating speed according to the correction value to obtain a corrected rotating speed;
acquiring an external cooling demand outside the engine, and determining the cooling rotating speed of the electronic water pump according to the external cooling demand;
determining the cylinder body rotating speed of the electronic water pump according to the water temperature of the cylinder body;
and determining the output rotating speed of the electronic water pump according to the corrected rotating speed, the cooling rotating speed and the cylinder rotating speed.
6. The electronic water pump control method of an engine according to claim 5, wherein said determining an output rotation speed of the electronic water pump based on the correction rotation speed, the cooling rotation speed, and the block rotation speed includes:
determining a maximum rotation speed among the correction rotation speed, the cooling rotation speed and the cylinder rotation speed;
acquiring fifth preset data, wherein the fifth preset data is the rotating speed range of the electronic water pump under different engine water temperatures;
determining the rotating speed range of the electronic water pump under the water temperature of the cylinder body in the fifth preset data;
determining whether the maximum rotating speed is in a rotating speed range of the electronic water pump at the water temperature of the cylinder body;
and if the maximum rotating speed is in the rotating speed range of the electronic water pump under the water temperature of the cylinder body, determining the output rotating speed of the electronic water pump as the maximum rotating speed.
7. The electronic water pump control method for an engine according to any one of claims 1 to 6, wherein after determining the control mode of the electronic water pump based on the real-time water temperature, the method further comprises:
if the control mode of the electronic water pump is determined to be a warming control mode, determining whether the water temperature of the cylinder body in the real-time water temperature is lower than a first preset temperature, wherein the water temperature of the warming control mode is lower than that of the open-loop control mode;
if the water temperature of the cylinder body is lower than the first preset temperature, controlling the output rotating speed of the electronic water pump to be a first warming rotating speed;
if the water temperature of the cylinder body is greater than or equal to the first preset temperature, determining whether the water temperature of the cylinder body is greater than a second preset temperature;
if the water temperature of the cylinder body is less than or equal to the second preset temperature, controlling the output rotating speed of the electronic water pump to be a second warming-up rotating speed;
and if the water temperature of the cylinder body is higher than the second preset temperature, determining a third warming-up rotating speed of the electronic water pump according to the water temperature of the cylinder body, and controlling the output rotating speed of the electronic water pump to be the third warming-up rotating speed.
8. The engine electric water pump control method according to claim 7, characterized in that after the control of the output rotation speed of the electric water pump to a second warm-up rotation speed, the method further comprises:
determining whether the water temperature of a cylinder cover in the real-time water temperatures is higher than a third preset temperature, wherein the third preset temperature is lower than the second preset temperature and higher than the first preset temperature;
if the water temperature of the cylinder cover is higher than the third preset temperature, determining whether an external cooling demand outside the engine is received;
if an external cooling demand outside the engine is received, determining the cooling rotating speed of the electronic water pump according to the external cooling demand;
determining a fourth warming-up rotating speed of the electronic water pump according to the water temperature of the cylinder body and the cooling rotating speed;
and controlling the output rotating speed of the electronic water pump to be the fourth warming-up rotating speed.
9. The engine electric water pump control method according to claim 7, characterized in that after the control of the output rotation speed of the electric water pump to the third warm-up rotation speed, the method further comprises:
acquiring the ambient temperature of the vehicle, and determining whether the ambient temperature is less than a preset ambient temperature;
if the environment temperature is lower than the preset environment temperature, determining whether the cylinder cover water temperature in the real-time water temperature is higher than a fourth preset temperature which is lower than a first open-loop temperature;
if the water temperature of the cylinder cover is higher than the fourth preset temperature, timing, and inquiring the warming-up time corresponding to the environment temperature in sixth preset data;
and if the timing duration is longer than the warming-up duration corresponding to the environment temperature, determining that the control mode of the electronic water pump is an open-loop control mode.
10. An electronic water pump control device for an engine, characterized by comprising:
the system comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining the real-time water temperature of an engine in a vehicle and determining the control mode of an electronic water pump according to the real-time water temperature;
the acquisition module is used for acquiring the real-time rotating speed and the real-time load of the engine if the control mode of the electronic water pump is determined to be an open-loop control mode;
a second determination module for determining whether the engine is at risk of overheating based on the real-time water temperature and the real-time load;
the query module is used for querying the real-time rotating speed and a first rotating speed corresponding to the real-time load in first preset data if the engine is determined not to have overheating risk, and taking the first rotating speed as a target rotating speed of the electronic water pump, wherein the first preset data are rotating speed data calibrated by the electronic water pump under the steady-state working condition of the engine;
and the control module is used for controlling the electronic water pump according to the target rotating speed.
CN202110017802.3A 2021-01-07 2021-01-07 Engine electronic water pump control method and device Active CN114738101B (en)

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