CN114592991B - Valve control method and device - Google Patents

Valve control method and device Download PDF

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Publication number
CN114592991B
CN114592991B CN202210223990.XA CN202210223990A CN114592991B CN 114592991 B CN114592991 B CN 114592991B CN 202210223990 A CN202210223990 A CN 202210223990A CN 114592991 B CN114592991 B CN 114592991B
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China
Prior art keywords
temperature
egr system
valve
opening
target
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CN114592991A (en
Inventor
封栋梁
张硕
孙国治
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Priority to CN202210223990.XA priority Critical patent/CN114592991B/en
Publication of CN114592991A publication Critical patent/CN114592991A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The embodiment of the application provides a valve control method which is used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the stopped state, the first valve may be controlled to maintain the maximum opening. The first valve is a coolant intake valve of the EGR system. In this way, when the vehicle is just started, the first valve is in the maximum opening state, and the EGR system is heated by the coolant, so that the temperature of the EGR system is kept in a high range, and coking due to the excessively low EGR temperature is prevented. During operation of the vehicle, an EGR system temperature may be obtained and a determination may be made as to whether the EGR system temperature reaches a first temperature threshold. If the temperature of the EGR system reaches the first temperature threshold, which indicates that the temperature of the EGR system is relatively high, the opening of the first valve may be adaptively adjusted to maintain the temperature of the EGR system within a suitable range. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the failure of the EGR system is avoided.

Description

Valve control method and device
Technical Field
The application relates to the technical field of automobiles, in particular to a valve control method and device.
Background
With environmental pollution, how to reduce pollutant emissions from vehicles becomes an important issue in solving environmental pollution. As a means, an Exhaust Gas Recirculation (EGR) system may be deployed in a vehicle. EGR systems may be used to reduce the content of nitrogen oxides (NOx) in engine exhaust. Specifically, the EGR system may mix exhaust gas generated by the engine combustion chamber with air entering the engine to reduce oxygen content in the engine intake, thereby reducing the temperature of the engine combustion chamber, reducing the amount of nitrogen oxides generated, and thereby reducing the amount of engine pollutant emissions.
However, in a cold and low-temperature environment, the temperature of the EGR system is close to the ambient temperature and is low. While the temperature of the exhaust gases exiting the combustion chamber may be relatively high. Higher temperature exhaust gases may coke when entering a lower temperature EGR system. The coking products can block the EGR system, and the jamming fault occurs, so that the normal operation of the EGR system is affected.
Disclosure of Invention
In view of this, the embodiment of the application provides a valve control method and a device, which aim to flexibly control the temperature of an EGR system and avoid the failure of the EGR system.
In a first aspect, an embodiment of the present application provides a valve control method, including:
controlling a first valve to maintain a maximum opening in response to a vehicle entering an operating state from a stopped state, wherein the first valve is a coolant water inlet valve of an Exhaust Gas Recirculation (EGR) system of the vehicle, and the coolant is used for raising the temperature of the EGR system;
acquiring the temperature of the EGR system;
and controlling the opening degree of the first valve according to the EGR system temperature in response to the EGR system temperature reaching a first temperature threshold.
In one possible design, the controlling the opening of the first valve according to the EGR system temperature includes:
calculating a target valve opening corresponding to the temperature of the EGR system according to a target valve opening corresponding relation, wherein the target valve opening corresponding relation comprises a corresponding relation between the temperature of the EGR system and the opening of the first valve;
and controlling the first valve according to the target opening so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with highest efficiency of the EGR system.
In one possible design, the calculating the target opening corresponding to the EGR system temperature according to the target valve opening correspondence includes:
acquiring engine operating parameters of the vehicle, wherein the engine operating parameters comprise load and/or rotating speed of an engine of the vehicle;
and determining the corresponding relation of the target valve opening from the corresponding relation of a plurality of valve openings according to the engine working parameters, wherein the corresponding relation of the plurality of valve openings is different in engine working parameters.
In one possible design, the controlling the opening of the first valve according to the EGR system temperature includes:
determining a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, wherein the target opening degree is matched with the EGR system temperature;
and controlling the opening of the first valve to be the target opening.
In a second aspect, embodiments of the present application provide a valve control apparatus, the apparatus comprising:
a control unit for controlling a first valve to maintain a maximum opening in response to a vehicle entering an operating state from a stopped state, the first valve being a coolant intake valve of an exhaust gas recirculation EGR system of the vehicle, the coolant being for elevating a temperature of the EGR system;
an acquisition unit configured to acquire the EGR system temperature;
the control unit is further configured to control the opening of the first valve according to the EGR system temperature in response to the EGR system temperature reaching a first temperature threshold.
In one possible design, the control unit is specifically configured to calculate a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relationship, where the target valve opening corresponding relationship includes a corresponding relationship between the EGR system temperature and the opening of the first valve; and controlling the first valve according to the target opening so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with highest efficiency of the EGR system.
In one possible design, the control unit is specifically configured to obtain an engine operating parameter of the vehicle, where the engine operating parameter includes a load and/or a rotational speed of an engine of the vehicle; and determining the corresponding relation of the target valve opening from the corresponding relation of a plurality of valve openings according to the engine working parameters, wherein the corresponding relation of the plurality of valve openings is different in engine working parameters.
In one possible design, the control unit is configured to determine a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, the target opening degree matching the EGR system temperature; and controlling the opening of the first valve to be the target opening.
In a third aspect, embodiments of the present application provide an apparatus comprising a memory for storing instructions or code and a processor for executing the instructions or code to perform the valve control method of any of the preceding first aspects.
In a fourth aspect, an embodiment of the present application provides a vehicle, the vehicle including an EGR system and a controller for controlling a first valve of the EGR system to implement a valve control method according to any one of the first aspects described above
The embodiment of the application provides a valve control method and a valve control device, which are used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the stopped state, the first valve may be controlled to maintain the maximum opening. The first valve is a coolant intake valve of the EGR system. Therefore, when the vehicle is just started, the first valve is in the maximum opening state, and the temperature of the EGR system can be kept in a higher range by heating the EGR system through the cooling liquid, so that coking caused by too low temperature of the EGR system is avoided. During vehicle operation, as the temperature of the EGR system increases, the flow of coolant used to heat the EGR system may be reduced. Specifically, an EGR system temperature may be obtained and a determination may be made as to whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be reduced appropriately. Specifically, the opening degree of the first valve may be controlled according to the EGR system temperature. That is, in the case where the temperature of the EGR system is low, the cooling liquid is used to heat the EGR system; after the EGR system temperature increases to the first temperature threshold, the flow of coolant that heats the EGR system is reduced. Thus, the exhaust gas coking caused by the too low EGR temperature can be prevented, and the EGR temperature can be controlled within a reasonable range when the EGR temperature is increased. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the failure of the EGR system is avoided.
Drawings
In order to more clearly illustrate this embodiment or the technical solutions of the prior art, the drawings that are required for the description of the embodiment or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling a valve according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a valve control device according to an embodiment of the present application.
Detailed Description
When the engine works, air is sucked into the combustion chamber from the air inlet, and the air and fuel are mixed and combusted in the combustion chamber and then discharged out of the combustion chamber through the exhaust port. If the temperature in the combustion chamber is too high, combustion of the fuel may produce nitrogen oxides (NOx) such as nitric oxide, nitrogen dioxide, and the like. The pollution of nitrogen oxides to the environment is serious. In order to reduce the pollution of the vehicle, it is necessary to reduce the content of nitrogen oxides in the exhaust gas of the engine. Therefore, EGR systems are currently mostly deployed on vehicle engines.
The EGR system may direct a portion of the exhaust gas exiting the exhaust port to an intake port of the engine, mixing with the intake air of the engine into the combustion chamber. Thus, mixing the exhaust gas with air can reduce the oxygen content of the gas entering the combustion chamber of the engine, thereby suppressing the combustion of the fuel and reducing the temperature in the combustion chamber of the engine, due to the low oxygen content of the exhaust gas from the exhaust port. Thus, the content of nitrogen oxides in the exhaust gas generated by combustion is less, and the pollution of the engine exhaust gas to the environment is reduced.
In a severe cold environment, the temperature of each device in a vehicle in a parked state for a long time approaches the ambient temperature. The temperature of the EGR system is low. While the temperature of the exhaust gas discharged from the engine combustion chamber is high. In this way, the high temperature exhaust gas may be rapidly cooled by the EGR system as the exhaust gas enters the EGR system. The sudden drop in temperature causes condensation of water vapor, sulfides and other substances in the exhaust gas, and the condensation adheres to the surface of the EGR system in a solid state, so that coking occurs. With serious coking, a passage for transmitting exhaust gas in the EGR system may be blocked by coking, and a clamping stagnation fault occurs, so that normal running of a vehicle is affected.
In order to increase the temperature of an EGR system which is reasonably controlled, the embodiment of the application provides a valve control method and a valve control device.
Optionally, the technical scheme provided by the embodiment of the application can be applied to an electronic control unit (Electronic Control Unit, ECU) on a vehicle, and also can be applied to equipment with data processing capability on a vehicle such as a vehicle-mounted computer. Alternatively, if an EGR system is also applied to an engine of another device other than a vehicle, the valve control method provided in the embodiment of the present application may be applied to a control apparatus of the device.
From the electronic control unit point of view below. The valve control method provided by the embodiment of the application is described. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, fig. 1 is a flowchart of a method for controlling a valve according to an embodiment of the present application, including:
s101: and acquiring a vehicle starting signal, and controlling the first valve to keep the maximum opening.
If the vehicle is in a parking state, various components on the vehicle are in a dormant or closed state, and the engine of the vehicle is not operated. After the vehicle is started, the engine starts to operate. The coolant is used to cool the engine during operation of the engine so as to avoid overheating of the engine. That is, after the vehicle enters the operating state, the temperature of the coolant gradually increases due to the operation of the engine. Therefore, in order to increase the temperature of the EGR system, the EGR system may be heated by the coolant.
Therefore, in order to avoid coking of the EGR system due to too low a temperature of the EGR system, the first valve may be controlled to open immediately after the vehicle is started. The first valve is a cooling liquid inlet valve of the EGR system. If the first valve is in an open state, the coolant flows into the cooler of the EGR system, and the temperature of the EGR system increases due to the heating of the coolant. Thus, coking caused by too low temperature of the EGR system can be avoided to a certain extent.
However, the temperature of the coolant is relatively low when the temperature of the EGR system is the lowest at the time of starting the vehicle, and when the engine is in the operating state. Therefore, in order to improve the heating effect on the EGR system, coking can be further prevented, and the opening degree of the first valve can be controlled to be the maximum opening degree of the first valve, that is, the full opening of the first valve can be controlled. In this way, the flow rate of the cooling liquid for heating the EGR system is improved, so that the temperature of the EGR system can be quickly increased to a higher level, and coking of the EGR system is further prevented. As the vehicle operates, the higher temperature exhaust gas gradually increases the temperature of the EGR system, and the heating of the coolant also causes the temperature of the EGR system to rise. In this way, if the first valve is kept in the fully open state all the time, the temperature of the EGR system may be excessively high.
However, the temperature of the EGR system may vary and the efficiency of the exhaust gas circulation may vary. In particular, if the temperature of the EGR system is too high, resulting in the exhaust gas being maintained in a high temperature state, the temperature of the gas entering the combustion chamber after the exhaust gas is mixed with air may be high, resulting in the EGR system having a deteriorated effect of reducing the amount of nitrogen oxide emissions. Also, if the temperature of the EGR system is too high, resulting in the exhaust gas being maintained at a low temperature, the temperature of the gas entering the combustion chamber after the exhaust gas is mixed with air may be low, resulting in the EGR system having a deteriorated effect of reducing the amount of nitrogen oxide emissions. That is, in order to ensure the efficiency of the EGR system in reducing the amount of nitrogen oxide emissions, the temperature of the EGR system may be controlled within a reasonable range.
In the embodiment of the application, the opening of the first valve can be adjusted to adjust the flow of the cooling liquid heated by the EGR system, so that the temperature of the EGR system is controlled within a reasonable range. Specifically, the electronic control unit of the vehicle may execute S102 and S103 described below.
S102: the EGR system temperature is obtained.
To adjust the flow of coolant heated for the EGR system, the vehicle's electronic control unit may first determine the temperature range that maximizes the efficiency of the EGR system. Specifically, an electronic control unit of the vehicle first acquires an EGR system temperature. For example, one or more temperature sensors may be deployed in an EGR system. The temperature sensor may detect the temperature of the EGR system and send it to the electronic control unit of the vehicle.
After the EGR system temperature is obtained, the electronic control unit of the vehicle may compare the EGR system temperature to a first temperature threshold. If the EGR system temperature is less than the first temperature threshold, it is indicated that the EGR system is still in a cooler state. If the flow of coolant to the EGR system is reduced, it may result in a cooler EGR system, which may lead to coking. Thus, if the EGR system temperature is less than the first temperature threshold, the electronic control unit of the vehicle may continue to maintain the first valve in a state of maximum opening. If the EGR system temperature is greater than or equal to the first temperature threshold, it is indicated that the temperature of the EGR system is relatively high. If the first valve remains fully closed, which may cause further increases in the temperature of the EGR system, the efficiency of the EGR system is reduced and damaged, so that if the temperature of the EGR system is greater than or equal to the first temperature threshold, the electronic control unit of the vehicle may perform S103 to control the opening of the first valve according to the temperature of the EGR system.
S103: and controlling the opening degree of the first valve according to the temperature of the EGR system in response to the temperature of the EGR system reaching the first temperature threshold.
If the EGR temperature is too high, the emission reduction efficiency of the EGR system may decrease; if the EGR temperature is too low, coking of the EGR system may occur. Even if the EGR system is not damaged or coked, the efficiency of the EGR system may be affected if the exhaust gas circulated in the EGR system is not maintained in a proper range, and nitrogen oxides may still be generated during the combustion of the engine.
Thus, after determining that the temperature of the EGR system reaches the first temperature threshold, the electronic control unit of the vehicle may determine a target valve opening of the first valve based on the EGR system temperature, and control the first valve based on the target valve opening of the first valve. Specifically, the electronic control system of the vehicle may calculate a target opening degree corresponding to the EGR system temperature from the target valve opening degree correspondence.
The corresponding relation of the target valve opening represents the corresponding relation between the temperature of the EGR system and the opening of the first valve, and the corresponding relation comprises the target valve opening corresponding to the first valve under different EGR waste gas temperatures. In the case where the opening degree of the first valve is the target valve opening degree, the exhaust gas in the EGR system is adjusted to the exhaust gas temperature that makes the EGR system most efficient.
In some possible implementations, a plurality of opening gear positions of the first valve may be preset. In this way, the electronic control unit may select one opening gear from the plurality of opening gears as the target opening gear of the first valve according to the EGR system temperature. For example, a plurality of opening gear positions may be provided including 25%, 50%, 75%, and 100%, corresponding to 25%, 50%, 75%, and 100% of the maximum opening, respectively. Accordingly, the first valve may be controlled by the switching circuit.
In some possible implementations, the electronic control unit of the vehicle may include a plurality of target valve opening correspondences. Each target valve corresponds to a coolant temperature. Thus, when determining the target valve opening of the first valve, the electronic control unit of the vehicle may acquire the coolant temperature and determine the target valve opening correspondence according to the coolant temperature. Thus, the target valve opening degree which is matched with the cooling liquid temperature and the EGR exhaust gas temperature to the highest degree can be obtained, and the highest efficiency of the EGR system is ensured.
In some possible implementations, the target valve opening may be modified based on environmental factors. For example, during actual travel of the vehicle, the load and speed of the vehicle engine may affect the most appropriate EGR exhaust gas temperature. Accordingly, the electronic control unit of the vehicle may obtain vehicle engine operating parameters including the load of the engine and/or the rotational speed of the engine. Then, the target valve opening correspondence may be determined from among the plurality of valve opening correspondences in accordance with the engine operating parameter. Then, the electronic control unit determines a target valve opening corresponding to the first valve according to the target valve opening corresponding relation and the EGR temperature.
In addition, the opening of the target valve can be corrected according to environmental parameters such as the ambient temperature, the atmospheric pressure and the like, and the description is omitted here.
In some possible implementations, if the vehicle is running for a long period of time, the EGR temperature continues to increase, resulting in cooling of the EGR system by coolant alone, failing to control the EGR system within a reasonable range. For this purpose, the electronic control unit can monitor the temperature of the cooling fluid. If the coolant temperature reaches the second water temperature threshold, the electronic control unit may reduce the temperature of the coolant by initiating a large circulation. That is, if the EGR system temperature is less than the first temperature threshold, the electronic control unit performs open-loop control of the first valve, maintaining the first valve in a maximum opening state. If the EGR system temperature is between the first temperature threshold and the second temperature threshold, the electronic control unit performs closed-loop control on the first valve according to the EGR temperature, for example, the opening degree of the first valve can be controlled through a proportional-integral-derivative (Proportion Integral Differential, PID) control algorithm. In some possible implementations, even if the EGR system is heated by the coolant, it may not be possible to raise the EGR system to a temperature range where the emission reduction efficiency is highest due to a problem of the vehicle running environment. In this way, the electronic control unit of the vehicle may issue a reminder to the driver to inform the driver that the temperature of the EGR system is low.
The embodiment of the application provides a valve control method which is used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the stopped state, the first valve may be controlled to maintain the maximum opening. The first valve is a coolant intake valve of the EGR system. Therefore, when the vehicle is just started, the first valve is in the maximum opening state, and the temperature of the EGR system can be kept in a higher range by heating the EGR system through the cooling liquid, so that coking caused by too low temperature of the EGR system is avoided. During vehicle operation, as the temperature of the EGR system increases, the flow of coolant used to heat the EGR system may be reduced. Specifically, an EGR system temperature may be obtained and a determination may be made as to whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be reduced appropriately. Specifically, the opening degree of the first valve may be controlled according to the EGR system temperature. That is, in the case where the temperature of the EGR system is low, the cooling liquid is used to heat the EGR system; after the EGR system temperature increases to the first temperature threshold, the flow of coolant that heats the EGR system is reduced. Thus, the exhaust gas coking caused by the too low EGR temperature can be prevented, and the EGR temperature can be controlled within a reasonable range when the EGR temperature is increased. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the failure of the EGR system is avoided.
The embodiments of the present application provide some specific implementations of a valve control method, and based on this, the present application also provides a corresponding device. The apparatus provided by the embodiment of the present application will be described in terms of functional modularization.
Referring to the schematic structural diagram of the valve control device shown in fig. 2, the device 200 includes an acquisition unit 210 and a control unit 220. Wherein the obtaining unit 210 is configured to obtain the EGR system temperature.
The control unit 220 is configured to control a first valve to maintain a maximum opening in response to the vehicle entering an operating state from a stopped state, where the first valve is a coolant intake valve of an EGR system for recirculating exhaust gas of the vehicle, and the coolant is configured to raise a temperature of the EGR system.
The control unit 220 is further configured to control the opening of the first valve according to the EGR system temperature in response to the EGR system temperature reaching a first temperature threshold.
The embodiment of the application provides a valve control device which is used for flexibly controlling the temperature of an EGR system. Specifically, when the vehicle enters the working state from the stopped state, the first valve may be controlled to maintain the maximum opening. The first valve is a coolant intake valve of the EGR system. Therefore, when the vehicle is just started, the first valve is in the maximum opening state, and the temperature of the EGR system can be kept in a higher range by heating the EGR system through the cooling liquid, so that coking caused by too low temperature of the EGR system is avoided. During vehicle operation, as the temperature of the EGR system increases, the flow of coolant used to heat the EGR system may be reduced. Specifically, an EGR system temperature may be obtained and a determination may be made as to whether the EGR system temperature reaches a first temperature threshold. If the EGR system temperature reaches the first temperature threshold, indicating that the EGR system temperature is high, the opening of the first valve may be reduced appropriately. Specifically, the opening degree of the first valve may be controlled according to the EGR system temperature. That is, in the case where the temperature of the EGR system is low, the cooling liquid is used to heat the EGR system; after the EGR system temperature increases to the first temperature threshold, the flow of coolant that heats the EGR system is reduced. Thus, the exhaust gas coking caused by the too low EGR temperature can be prevented, and the EGR temperature can be controlled within a reasonable range when the EGR temperature is increased. Therefore, the temperature of the EGR system can be flexibly controlled by controlling the first valve in different control modes, so that the failure of the EGR system is avoided.
Optionally, in some possible implementations, the control unit 220 is configured to calculate a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relationship, where the target valve opening corresponding relationship includes a corresponding relationship between the EGR system temperature and the opening of the first valve; and controlling the first valve according to the target opening so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with highest efficiency of the EGR system.
Optionally, in some possible implementations, the control unit 220 is specifically configured to obtain an engine operating parameter of the vehicle, where the engine operating parameter includes a load and/or a rotational speed of an engine of the vehicle; and determining the corresponding relation of the target valve opening from the corresponding relation of a plurality of valve openings according to the engine working parameters, wherein the corresponding relation of the plurality of valve openings is different in engine working parameters.
Optionally, in some possible implementations, the control unit 220 is configured to determine a target opening from a plurality of candidate openings according to the EGR system temperature, where the target opening matches the EGR system temperature; and controlling the opening of the first valve to be the target opening.
The embodiment of the application also provides corresponding equipment and a computer storage medium, which are used for realizing any one of the valve control methods provided by the embodiment of the application. The apparatus includes a memory for storing instructions or code and a processor for executing the instructions or code to perform the valve control method of any of the embodiments of the present application. The device may be, for example, an electronic control unit of a vehicle, or may be an electronic control unit of a vehicle, and a control circuit connected to the electronic control unit. In addition, the embodiment of the application also provides an automobile, which comprises an EGR system and a controller, wherein the controller is used for realizing the valve control method provided by the embodiment of the application.
The "first" and "second" in the names of "first", "second" (where present) and the like in the embodiments of the present application are used for name identification only, and do not represent the first and second in sequence.
From the above description of embodiments, it will be apparent to those skilled in the art that all or part of the steps of the above described example methods may be implemented in software plus general hardware platforms. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a read-only memory (ROM)/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network communication device such as a router) to perform the method according to the embodiments or some parts of the embodiments of the present application.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
The foregoing description of the exemplary embodiments of the application is merely illustrative of the application and is not intended to limit the scope of the application.

Claims (6)

1. A method of valve control, the method comprising:
controlling a first valve to maintain a maximum opening in response to a vehicle entering an operating state from a stopped state, wherein the first valve is a coolant water inlet valve of an Exhaust Gas Recirculation (EGR) system of the vehicle, and the coolant is used for raising the temperature of the EGR system;
acquiring the temperature of the EGR system;
controlling the opening of the first valve according to the EGR system temperature in response to the EGR system temperature reaching a first temperature threshold;
wherein said controlling the opening of the first valve according to the EGR system temperature includes:
calculating a target valve opening corresponding to the temperature of the EGR system according to a target valve opening corresponding relation, wherein the target valve opening corresponding relation comprises a corresponding relation between the temperature of the EGR system and the opening of the first valve;
controlling a first valve according to the target opening so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with highest efficiency of the EGR system;
wherein, according to the corresponding relation of the target valve opening, calculating the target opening corresponding to the temperature of the EGR system comprises:
acquiring engine operating parameters of the vehicle, wherein the engine operating parameters comprise load and/or rotating speed of an engine of the vehicle;
and determining the corresponding relation of the target valve opening from the corresponding relation of a plurality of valve openings according to the engine working parameters, wherein the corresponding relation of the plurality of valve openings is different in engine working parameters.
2. The method of claim 1, wherein said controlling the opening of the first valve in accordance with the EGR system temperature comprises:
determining a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, wherein the target opening degree is matched with the EGR system temperature;
and controlling the opening of the first valve to be the target opening.
3. A valve control apparatus, the apparatus comprising:
a control unit for controlling a first valve to maintain a maximum opening in response to a vehicle entering an operating state from a stopped state, the first valve being a coolant intake valve of an exhaust gas recirculation EGR system of the vehicle, the coolant being for elevating a temperature of the EGR system;
an acquisition unit configured to acquire the EGR system temperature;
the control unit is further used for controlling the opening degree of the first valve according to the temperature of the EGR system in response to the temperature of the EGR system reaching a first temperature threshold;
the control unit is specifically configured to calculate a target valve opening corresponding to the EGR system temperature according to a target valve opening corresponding relation, where the target valve opening corresponding relation includes a corresponding relation between the EGR system temperature and the opening of the first valve; controlling a first valve according to the target opening so that the temperature of the EGR system is matched with a target temperature interval, wherein the target temperature interval is a temperature interval with highest efficiency of the EGR system;
the control unit is specifically configured to obtain an engine operating parameter of the vehicle, where the engine operating parameter includes a load and/or a rotational speed of an engine of the vehicle; and determining the corresponding relation of the target valve opening from the corresponding relation of a plurality of valve openings according to the engine working parameters, wherein the corresponding relation of the plurality of valve openings is different in engine working parameters.
4. The apparatus of claim 3, wherein the device comprises a plurality of sensors,
the control unit is used for determining a target opening degree from a plurality of candidate opening degrees according to the EGR system temperature, and the target opening degree is matched with the EGR system temperature; and controlling the opening of the first valve to be the target opening.
5. An apparatus comprising a memory for storing instructions or code and a processor for executing the instructions or code to perform the valve control method of claim 1 or 2.
6. A vehicle comprising an EGR system and a controller for controlling a first valve of the EGR system to implement the valve control method according to claim 1 or 2.
CN202210223990.XA 2022-03-07 2022-03-07 Valve control method and device Active CN114592991B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202228217U (en) * 2011-09-15 2012-05-23 潍柴动力股份有限公司 Control equipment of EGR (exhaust gas recirculation) valve
CN104930257A (en) * 2015-04-29 2015-09-23 潍柴动力股份有限公司 Control method and device of valve
JP2018084222A (en) * 2016-11-25 2018-05-31 トヨタ自動車株式会社 Control device of internal combustion engine
CN109083755A (en) * 2018-09-30 2018-12-25 潍柴动力股份有限公司 A kind of engine valve control method and device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202228217U (en) * 2011-09-15 2012-05-23 潍柴动力股份有限公司 Control equipment of EGR (exhaust gas recirculation) valve
CN104930257A (en) * 2015-04-29 2015-09-23 潍柴动力股份有限公司 Control method and device of valve
JP2018084222A (en) * 2016-11-25 2018-05-31 トヨタ自動車株式会社 Control device of internal combustion engine
CN109083755A (en) * 2018-09-30 2018-12-25 潍柴动力股份有限公司 A kind of engine valve control method and device

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