CN115075971A - Single cylinder control method and device, electronic control unit and storage medium - Google Patents

Single cylinder control method and device, electronic control unit and storage medium Download PDF

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Publication number
CN115075971A
CN115075971A CN202210662786.8A CN202210662786A CN115075971A CN 115075971 A CN115075971 A CN 115075971A CN 202210662786 A CN202210662786 A CN 202210662786A CN 115075971 A CN115075971 A CN 115075971A
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preset
cylinder engine
single cylinder
output power
value
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CN202210662786.8A
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CN115075971B (en
Inventor
王惠林
王梦
王洪宝
孙晓东
王峰
史艳军
许晓颖
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1486—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor with correction for particular operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/3082—Control of electrical fuel pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The embodiment of the disclosure provides a single-cylinder engine control method, a single-cylinder engine control device, an electronic control unit and a storage medium, wherein the method comprises the steps of controlling a high-pressure oil pump to operate according to a preset low-rotation-speed default value after the single-cylinder engine is monitored to be started; when the output power of the single cylinder engine is detected to be in a rising trend, detecting whether the output power of the single cylinder engine is larger than a preset high-power limit value or not, and if so, controlling the high-pressure oil pump to operate according to a preset high-rotating-speed default value; when the high-pressure oil pump operates according to the high-rotation-speed default value and the output power of the single cylinder engine is detected to be in a descending trend, whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not is detected, and if yes, the high-pressure oil pump is controlled to operate according to the low-rotation-speed default value. The embodiment of the disclosure can avoid the problem that the rail pressure and the fuel oil combustion are unstable due to the fact that the rotating speed of the high-pressure oil pump is changed all the time by the PID controller, completely meets the fuel oil supply requirement of the single cylinder engine through switching the two rotating speed sections of the high-pressure oil pump, and improves the convenience.

Description

Single cylinder control method and device, electronic control unit and storage medium
Technical Field
The embodiment of the disclosure relates to the technical field of engines, in particular to a single cylinder engine control method and device, an electronic control unit and a storage medium.
Background
The single cylinder engine is supplied with oil by a high-pressure oil pump driven by an external variable frequency motor instead of an oil pump driven by an engine. Usually, the variable frequency motor adopts a constant default rotating speed, so that the rotating speed of the high-pressure oil pump of the single-cylinder engine is also constant. After the single cylinder engine is started, in a low-load region, the fuel consumption is low, excessive fuel supply and insufficient or too slow oil drainage capacity can be caused, the pressure of the feed oil and the return oil of the single cylinder engine is high, and the actual value of the rail pressure is higher than a set value and cannot be reduced. In a high-load area, fuel consumption is increased, and if the rotating speed of a high-pressure oil pump is not changed, insufficient fuel supply is easy to occur, so that the rail pressure is low, combustion is deteriorated, the exhaust temperature rises suddenly, protection and emergency stop are triggered, and great damage is caused to a single cylinder engine and an exhaust system.
Currently, the conventional method for controlling the rotation speed of the single-cylinder high-pressure oil pump generally uses a PID (proportional-integral-derivative) controller to control the rotation speed of the high-pressure oil pump.
However, the inventors found that the prior art has at least the following technical problems: the control characteristics of the PID controller such as continuous adjustment and oscillation can lead the rotating speed of the oil pump to be changed all the time, thus leading the fuel flow of the high-pressure oil pump of the single-cylinder engine to be changed, the rail pressure to be unstable, the fuel combustion to be unstable, and leading the fuel supply of the single-cylinder engine to be incapable of meeting the requirement.
Disclosure of Invention
The embodiment of the disclosure provides a single-cylinder engine control method, a single-cylinder engine control device, an electronic control unit and a storage medium, which are used for solving the problems that the rotating speed of an oil pump is constantly changed due to continuous adjustment and oscillation of a PID (proportion integration differentiation) controller, so that the fuel flow of a high-pressure oil pump of a single-cylinder engine is changed, the rail pressure is unstable, the fuel combustion is unstable, and the fuel supply of the single-cylinder engine cannot meet the requirement.
In a first aspect, an embodiment of the present disclosure provides a single cylinder engine control method, applied to an electronic control unit, including:
when the single-cylinder engine is monitored to be started, controlling the high-pressure oil pump to operate according to a preset low-rotation-speed default value;
when the output power of the single cylinder engine is detected to be in a rising trend, detecting whether the output power of the single cylinder engine is larger than a preset high-power limit value or not;
if the output power of the single cylinder engine is greater than the preset high power limit value, controlling the high-pressure oil pump to operate according to a preset high rotating speed default value;
when the high-pressure oil pump runs according to the preset high-rotation-speed default value and the output power of the single cylinder engine is detected to be in a descending trend, whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not is detected;
and if the output power of the single cylinder engine is smaller than the preset low-power limit value, controlling the high-pressure oil pump to operate according to the preset low-rotating-speed default value.
In one possible design, the detecting whether the output power of the single cylinder engine is greater than a preset high power limit when it is detected that the output power of the single cylinder engine is in an ascending trend includes:
if the output power of the single cylinder engine at any moment is larger than the output power of the single cylinder engine at the moment before the preset duration at any moment, determining that the output power of the single cylinder engine is in a rising trend, and detecting whether the output power of the single cylinder engine is larger than the preset high-power limit value or not.
In one possible design, the detecting whether the output power of the single cylinder engine is smaller than a preset high power limit when the output power of the single cylinder engine is detected to be in a downward trend includes:
if the output power of the single cylinder engine at any moment is smaller than the output power of the single cylinder engine at the moment before the preset duration at any moment, determining that the output power of the single cylinder engine is in a descending trend, and detecting whether the output power of the single cylinder engine is smaller than the preset low-power limit value or not.
In one possible design, the single cylinder control method further includes:
acquiring a rail pressure actual value of the common rail pipe;
determining the rail pressure deviation according to the rail pressure actual value and the rail pressure set value;
and if the absolute value of the rail pressure deviation is detected to be larger than a preset threshold value, correcting the rail pressure deviation.
In a possible design, the correcting the rail pressure deviation if it is detected that the absolute value of the rail pressure deviation is greater than a preset threshold includes:
if the rail pressure deviation is a positive value, gradually reducing the rotating speed of the high-pressure oil pump according to a first preset step length until the absolute value of the rail pressure deviation is smaller than or equal to a preset threshold value;
and if the rail pressure deviation is a negative value, gradually increasing the rotating speed of the high-pressure oil pump according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
In a possible design, if the rail pressure deviation is a positive value, the step-by-step decreasing the rotation speed of the high-pressure oil pump according to a first preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value includes:
if the rail pressure deviation is a positive value, reducing the rotating speed of the high-pressure oil pump according to the first preset step length, and after a preset time length, if the absolute value of the rail pressure deviation is detected to be still larger than the preset threshold value, continuing to gradually reduce the rotating speed of the high-pressure oil pump according to the first preset step length until the absolute value of the rail pressure deviation is smaller than or equal to the preset threshold value;
correspondingly, if the rail pressure deviation is a negative value, the rotating speed of the high-pressure oil pump is gradually increased according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value, and the method comprises the following steps:
if the rail pressure deviation is a negative value, the rotating speed of the high-pressure oil pump is increased according to the second preset step length, after the preset time length, if the absolute value of the rail pressure deviation is detected to be still smaller than the preset threshold value, the rotating speed of the high-pressure oil pump is continuously increased step by step according to the second preset step length until the absolute value of the rail pressure deviation is smaller than or equal to the preset threshold value.
In a second aspect, an embodiment of the present disclosure provides a single cylinder engine control apparatus, including:
the first control module is used for controlling the high-pressure oil pump to operate according to a preset low-rotating-speed default value after the single-cylinder engine is monitored to be started;
the first detection module is used for detecting whether the output power of the single cylinder engine is larger than a preset high-power limit value or not when the output power of the single cylinder engine is detected to be in a rising trend;
the second control module is used for controlling the high-pressure oil pump to operate according to a preset high-rotating-speed default value if the output power of the single cylinder engine is greater than the preset high-power limit value;
the second detection module is used for detecting whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not when the high-pressure oil pump operates according to the preset high-rotation-speed default value and the output power of the single cylinder engine is detected to be in a descending trend;
and the third control module is used for controlling the high-pressure oil pump to operate according to the preset low-rotating-speed default value if the output power of the single cylinder engine is smaller than the preset low-power limit value.
In a third aspect, an embodiment of the present disclosure provides an electronic control unit, including: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executes the computer-executable instructions stored by the memory such that the at least one processor performs the single cylinder control method as set forth in the first aspect above and in various possible designs of the first aspect.
In a fourth aspect, the embodiments of the present disclosure provide a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the single-cylinder control method according to the first aspect and various possible designs of the first aspect is implemented.
In a fifth aspect, embodiments of the present disclosure provide a computer program product comprising a computer program that, when executed by a processor, implements a single cylinder control method as set forth in the first aspect above and in various possible designs of the first aspect.
According to the single-cylinder engine control method, the single-cylinder engine control device, the electronic control unit and the storage medium, when it is monitored that the single-cylinder engine is started, the high-pressure oil pump is controlled to operate according to a preset low-rotation-speed default value, and when it is detected that the output power of the single-cylinder engine is in a rising trend, if it is detected that the output power of the single-cylinder engine is larger than a preset high-power limit value, the high-pressure oil pump is controlled to operate according to a preset high-rotation-speed default value. And the high-pressure oil pump operates according to a preset high-rotating-speed default value, and when the output power of the single cylinder engine is detected to be in a descending trend, if the output power of the single cylinder engine is detected to be smaller than a preset low-power limit value, the high-pressure oil pump is controlled to operate according to the preset low-rotating-speed default value. Therefore, the method can realize the automatic control of the rotating speed of the high-pressure oil pump based on the output power of the single cylinder engine, can completely meet the fuel supply requirement of the single cylinder engine only by switching two rotating speed sections of the high-pressure oil pump, and further can overcome the problem of unstable rail pressure and fuel combustion caused by the fact that the rotating speed of the high-pressure oil pump is changed all the time due to continuous adjustment and oscillation of a PID (proportion integration differentiation) controller.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can obtain other drawings without inventive labor.
FIG. 1 is a schematic diagram of a system architecture for single cylinder control provided by an embodiment of the present disclosure;
FIG. 2 is a first flowchart illustrating a single cylinder control method according to an embodiment of the present disclosure;
FIG. 3 is a second flowchart illustrating a single cylinder control method according to an embodiment of the present disclosure;
FIG. 4 is a third schematic flow chart illustrating a single cylinder control method provided in an embodiment of the present disclosure;
FIG. 5 is a fourth flowchart illustrating a single cylinder control method according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of a single cylinder control apparatus provided in an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a hardware structure of an electronic control unit ECU provided in the embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions in the embodiments of the present disclosure will be described clearly and completely with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The nouns to which this disclosure relates will be explained first:
single cylinder engine: refers to an engine having only one cylinder.
A high-pressure oil pump: refers to an engine fuel supply pump.
Rail pressure: refers to the fuel pressure in the common rail pipe of the high-pressure common rail system of the engine.
Rail pressure deviation: the difference value between the actual value and the set value of the rail pressure is referred to.
At present, in order to better adjust and control the rotating speed of a high-pressure oil pump of a single cylinder engine so as to meet the requirement of fuel supply, the technical method generally adopted is as follows: an operator manually changes the rotating speed of the high-pressure oil pump according to experience power sections and fuel consumption, or controls the rotating speed of the high-pressure oil pump by adopting a PID (proportion integration differentiation) controller.
However, the measure of manually changing the rotating speed of the high-pressure oil pump is easy to operate incorrectly, so that the rotating speed of the high-pressure oil pump is high in low power, the rotating speed of the high-pressure oil pump is low in high power, the problem is frequent, and the fuel supply requirement of a single cylinder engine cannot be met. If adopt the PID controller to control the high-pressure oil pump rotational speed, the control characteristics of PID controller itself, if keep adjusting, the oscillation can make the oil pump rotational speed change always, lead to the fuel flow of single cylinder engine high-pressure oil pump to change, the rail pressure is unstable, and the fuel combustion is unstable, makes the unable demand that satisfies of fuel feeding of single cylinder engine.
In order to solve the above technical problem, the embodiments of the present disclosure propose the following technical idea: in view of the above-mentioned deficiencies of the prior art single cylinder engine control methods, the present disclosure is based on the output power of the single cylinder engine to switch the high pressure oil pump speed. Based on the output power of the single cylinder engine, the rotating speed of the high-pressure oil pump is set to be switched between two rotating speed sections of a preset low rotating speed default value and a preset high rotating speed default value, and the defect that the rotating speed of the oil pump is changed all the time when the rotating speed of the high-pressure oil pump is controlled by a PID (proportion integration differentiation) controller is overcome. The problem that the existing single-cylinder engine control method cannot meet the fuel supply requirement of the single-cylinder engine is solved.
Fig. 1 is a schematic diagram of a system architecture for single cylinder control provided in an embodiment of the present disclosure. As shown in fig. 1, the system provided by the present embodiment includes: an electronic control unit ECU101, a high-pressure oil pump 102, a single cylinder engine 103 and an engine high-pressure common rail system common rail pipe 104. The high-pressure oil pump 102 is a fuel supply pump of a single cylinder engine 103 and is driven by an external variable frequency motor to supply oil. The electronic control unit ECU101 is in communication connection with the high-pressure oil pump 102, the single cylinder engine 103 and the common rail pipe 104 of the high-pressure common rail system of the engine, and the electronic control unit ECU101 can control the high-pressure oil pump 102, the single cylinder engine 103 and the common rail pipe 104 of the high-pressure common rail system of the engine.
Fig. 2 is a schematic flow chart of a single-cylinder control method according to an embodiment of the present disclosure, where an execution main body of the embodiment may be the electronic control unit ECU shown in fig. 1. As shown in fig. 2, includes:
s201: and monitoring the single-cylinder engine to drive.
A single cylinder engine refers to an engine having only one cylinder. The single cylinder engine is supplied with oil by a high-pressure oil pump driven by an external variable frequency motor.
S202: and controlling the high-pressure oil pump to operate according to a preset low-rotating-speed default value.
In the disclosed embodiment, the default low speed may be 1000 to 1200 rpm. For example, the default low speed is 1000rpm, 1100rpm or 1200 rpm.
In the embodiment of the present disclosure, the operating state of the high-pressure oil pump may also be marked by setting the hysteresis flag bit FLG _ Loop. And when the high-pressure oil pump is controlled to operate according to a preset low-rotating-speed default value, setting the hysteresis zone bit to be 0.
S203: when the output power of the single cylinder engine is detected to be in the ascending trend, whether the output power of the single cylinder engine is larger than a preset high-power limit value or not is detected. If yes, go to step S204, otherwise go to step S202.
In the disclosed embodiment, the output power of the single cylinder engine
Refers to the effective work done by the engine per unit time. The output power of the engine is typically measured in kilowatts using a dynamometer.
In the disclosed embodiment, the preset high power limit may be 300 to 600 kW. For example, the preset high power limit is 300kW, 400kW, or 600 kW.
In an optional embodiment of the present disclosure, when it is detected that the output power of the single cylinder engine is in an ascending trend, the process of detecting whether the output power of the single cylinder engine is greater than the preset high power limit value includes: if the output power of the single cylinder engine at any moment is larger than the output power of the single cylinder engine at the moment before the preset duration at any moment, determining that the output power of the single cylinder engine is in a rising trend, and detecting whether the output power of the single cylinder engine is larger than a preset high-power limit value or not.
The preset time duration may be any time duration, and the embodiment of the present disclosure is not limited in any way.
S204: and controlling the high-pressure oil pump to operate according to a preset high-rotating-speed default value.
In the disclosed embodiment, the default value of the preset high rotation speed may be 1600 to 1800 rpm. For example, the default high speed is 1600rpm, 1700rpm or 1800 rpm.
In the embodiment of the present disclosure, the operating state of the high-pressure oil pump may also be marked by setting the hysteresis flag bit FLG _ Loop. And when the high-pressure oil pump is controlled to operate according to a preset high-rotating-speed default value, setting the hysteresis zone bit to be 1.
S205: and when the output power of the single cylinder engine is detected to be in a descending trend, detecting whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not. If yes, go to step S202, otherwise go to step S204.
In the disclosed embodiment, the preset low power limit may be 50 to 150 kW. For example, the preset high power limit is 50kW, 100kW, or 150 kW.
In an optional embodiment of the present disclosure, when it is detected that the output power of the single cylinder engine is in a downward trend, detecting whether the output power of the single cylinder engine is smaller than a preset high power limit value includes:
if the output power of the single cylinder engine at any moment is smaller than the output power of the single cylinder engine at the moment before the preset duration at any moment, determining that the output power of the single cylinder engine is in a descending trend, and detecting whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not.
The preset time duration may be any time duration, and the embodiment of the present disclosure is not limited in any way.
In the embodiment of the disclosure, after the single-cylinder engine is started, the electronic control unit switches the rotating speed of the high-pressure oil pump according to the output power of the single-cylinder engine, compares the output power of the single-cylinder engine with a preset high-power limit value and a preset low-power limit value, and switches the rotating speed of the high-pressure oil pump between two rotating speed sections, namely a low-rotating-speed default value and a high-rotating-speed default value according to the comparison result.
It can be known from the description of the above embodiment that, in the embodiment of the present disclosure, after it is detected that the single cylinder engine is driven, the high-pressure oil pump is first controlled to operate according to the preset low-rotation-speed default value, and when it is detected that the output power of the single cylinder engine is in the rising trend, if it is detected that the output power of the single cylinder engine is greater than the preset high-power limit value, the high-pressure oil pump is controlled to operate according to the preset high-rotation-speed default value. And the high-pressure oil pump operates according to a preset high-rotating-speed default value, and when the output power of the single cylinder engine is detected to be in a descending trend, if the output power of the single cylinder engine is detected to be smaller than a preset low-power limit value, the high-pressure oil pump is controlled to operate according to the preset low-rotating-speed default value. Therefore, the method can realize the automatic control of the rotating speed of the high-pressure oil pump based on the output power of the single cylinder engine, can completely meet the fuel supply requirement of the single cylinder engine only by switching two rotating speed sections of the high-pressure oil pump, and further can overcome the problem of unstable rail pressure and fuel combustion caused by the fact that the rotating speed of the high-pressure oil pump is changed all the time due to continuous adjustment and oscillation of a PID (proportion integration differentiation) controller. In addition, this disclosed embodiment can also avoid according to the misoperation that the manual change high-pressure oil pump rotational speed of operating personnel experience brought, has promoted the convenience, and can not produce the damage to the single cylinder engine.
Fig. 3 is a schematic flow diagram of a single cylinder control method provided in the embodiment of the present disclosure, and this embodiment is based on the embodiment of fig. 2, and the single cylinder control method performed simultaneously with the embodiment of fig. 2 may further include a process of correcting the rail pressure deviation. As shown in fig. 3, the method includes:
s301: and acquiring the actual rail pressure value of the common rail pipe.
In the embodiment of the disclosure, the rail pressure refers to the internal oil pressure of the common rail pipe of the high-pressure common rail system of the engine.
In the embodiment of the present disclosure, the method for obtaining the rail pressure actual value of the common rail pipe comprises: and arranging a pressure sensor in the common rail pipe, wherein the internal fuel pressure value acquired by the pressure sensor is used as the actual rail pressure value.
S302: and determining the rail pressure deviation according to the actual rail pressure value and the set rail pressure value.
In the embodiment of the present disclosure, the rail pressure deviation is a difference value between the rail pressure actual value and the rail pressure set value.
In the embodiment of the present disclosure, the rail pressure actual value is a rail pressure average value within a preset time period. The rail pressure of the single-cylinder engine fluctuates instantaneously by +/-20 bar, so that the actual rail pressure value cannot be an instantaneous value, and the rail pressure average value is stable under normal conditions.
The preset duration may be set as required, and the embodiment of the present disclosure is not limited in any way. For example, the preset time period is 2 seconds, 4 seconds, or 6 seconds.
S303: and detecting whether the absolute value of the rail pressure deviation is greater than a preset threshold value. If yes, go to step S304, otherwise, end the process.
In the embodiment of the present disclosure, the preset threshold may be set as needed, and the embodiment of the present disclosure is not limited in any way. For example, the preset threshold is 5bar, 10bar or 15 bar.
S304: and correcting the rail pressure deviation.
In the embodiment of the present disclosure, correcting the rail pressure deviation means adjusting an absolute value of the rail pressure deviation to be smaller than a preset threshold.
The rail pressure actual value of the common rail pipe of the high-pressure common rail system of the engine is not quickly followed and constantly stabilized at a rail pressure set value, and is also an index for evaluating that the oil supply capacity of the single cylinder engine can not meet the use requirement. Therefore, on the basis that the rotation speed of the high-pressure oil pump is switched based on the output power of the single-cylinder engine in the embodiment of fig. 2, slight adjustment and correction are needed to be carried out on certain working conditions of the single-cylinder engine. And if the difference value between the actual rail pressure value and the set rail pressure value is detected to be larger, the rail pressure deviation needs to be corrected.
It can be known from the description of the above embodiments that, in the embodiment of fig. 2, on the basis of switching the rotation speed of the high-pressure oil pump based on the output power of the single cylinder engine, the deviation between the actual rail pressure value and the set rail pressure value is corrected, so that the actual rail pressure value of the common rail pipe of the high-pressure common rail system of the engine can quickly follow and be constantly stabilized at the set rail pressure value, the oil supply of the single cylinder engine meets the use requirement, and the defects brought by the control method of the high-pressure oil pump in the prior art to the operation of the single cylinder engine are overcome.
In an embodiment of the present disclosure, on the basis of the embodiment in fig. 3, the step S304 corrects the rail pressure deviation, including:
and if the rail pressure deviation is a positive value, gradually reducing the rotating speed of the high-pressure oil pump according to a first preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
In the embodiment of the present disclosure, the first preset step may be set as needed, and the embodiment of the present disclosure is not limited in any way. For example, the first preset step is set to 20rpm, 30rpm, 40rpm or 50 rpm;
and if the rail pressure deviation is a negative value, gradually increasing the rotating speed of the high-pressure oil pump according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
In the embodiments of the present disclosure, the configuration may be set as needed, and the embodiments of the present disclosure are not limited in any way. For example, the second preset step may be set to 20rpm, 30rpm, 40rpm or 50 rpm.
It can be known from the above description of the embodiment that the rotating speed of the high-pressure oil pump is corrected in a step manner, and the step length for correction is set according to the actual requirement, so that the rotating speed of the high-pressure oil pump is corrected in a reasonable step length, the rotating speed of the high-pressure oil pump is not greatly changed in a short time, and the correction of the rail pressure deviation can be more precise.
Fig. 4 is a third schematic flow chart of a single cylinder control method provided in the embodiment of the present disclosure, and this embodiment describes in detail a method for correcting rail pressure deviation in the embodiment of fig. 3. As shown in fig. 4, includes:
s401: and if the rail pressure deviation is a positive value, reducing the rotating speed of the high-pressure oil pump according to a first preset step length, and if the rail pressure deviation is a negative value, reducing the rotating speed of the high-pressure oil pump according to a second preset step length.
In the embodiment of the present disclosure, the first preset step length may be set as needed, and the embodiment of the present disclosure is not limited in any way. For example, the first preset step is set to 20rpm, 30rpm, 40rpm or 50 rpm.
In the embodiment of the present disclosure, the second preset step may be set as needed, and no limitation is made to the embodiment of the present disclosure. For example, the second preset step may be set to 20rpm, 30rpm, 40rpm or 50 rpm.
S402: and after the preset time length, detecting whether the absolute value of the rail pressure deviation is still larger than a preset threshold value. If so, S403 is executed, otherwise, the operation is ended.
In the embodiment of the present disclosure, the preset duration may be set as needed, and the embodiment of the present disclosure is not limited in any way. For example, the preset time period is 5 seconds, 10 seconds or 15 seconds.
S403: and if the rail pressure deviation is a positive value, the rotating speed of the high-pressure oil pump is continuously and gradually reduced according to the first preset step length until the absolute value of the rail pressure deviation is smaller than or equal to a preset threshold value. And if the rail pressure deviation is a negative value, continuously increasing the rotating speed of the high-pressure oil pump step by step according to the second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
As can be seen from the above description of the embodiments, when the step-type adjustment is used to adjust the rotation speed of the high-pressure oil pump in this embodiment, the rotation speed of the high-pressure oil pump is not continuously adjusted, but after the preset time duration is waited after the adjustment is performed once according to the preset step length, whether the absolute value of the rail pressure deviation is still greater than the preset threshold is detected again. If the absolute value of the rail pressure deviation is still larger than the preset threshold value, once adjustment is performed again according to the preset step length, and so on. The continuous adjustment of the rotating speed of the high-pressure oil pump is avoided by the adjusting mode, so that the adjustment is more accurate, and the actual value of the rail pressure can be closer to the set value of the rail pressure.
In one embodiment of the disclosure, after the absolute value of the rail pressure deviation is smaller than the preset threshold, if the working condition of the single cylinder engine changes, the rail pressure deviation is detected and corrected again. If the working condition of the single-cylinder engine does not change, the rail pressure deviation is not detected and corrected.
Fig. 5 is a fourth flowchart illustrating a single cylinder control method according to an embodiment of the present disclosure. The embodiment is a specific application example of the single-cylinder control method, and is detailed as follows:
s501: the single cylinder engine is monitored for start-up.
S502: and controlling the high-pressure oil pump to operate according to a preset low-rotating-speed default value.
S503: when the output power of the single cylinder engine is detected to be in the ascending trend, whether the output power of the single cylinder engine is larger than a preset high-power limit value or not is detected. If yes, go to S504, otherwise go to S502.
S504: and controlling the high-pressure oil pump to operate according to a preset high-rotating-speed default value.
S505: and when the output power of the single cylinder engine is detected to be in a descending trend, detecting whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not. If yes, go to step S506, otherwise go to step S504.
S506: and controlling the high-pressure oil pump to operate according to a preset low-rotating-speed default value.
S507: while executing S501 to S506, the rail pressure actual value of the common rail pipe is acquired.
S508: and determining the rail pressure deviation, namely the difference value between the rail pressure actual value and the rail pressure set value according to the rail pressure actual value and the rail pressure set value.
S509: and detecting whether the absolute value of the rail pressure deviation is greater than a preset threshold value. If yes, go to step S510, otherwise, end the process.
S510: and if the rail pressure deviation is a positive value, gradually reducing the rotating speed of the high-pressure oil pump according to a first preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value. And if the rail pressure deviation is a negative value, gradually increasing the rotating speed of the high-pressure oil pump according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
All steps in the embodiment are carried out under the condition that no fuel system reports errors, otherwise, the single cylinder engine is forced to be unloaded, so that the single cylinder engine does not inject fuel, and the rotating speed of the high-pressure oil pump is controlled by a lowest-value low-rotating-speed default value.
It can be known from the description of the above embodiment that, in the embodiment of the present disclosure, the rotating speeds of the high-pressure oil pump are automatically adjusted in two rotating speed sections of the high-pressure oil pump based on the output power of the single cylinder engine, and on this basis, the deviation between the rail pressure actual value and the rail pressure set value is corrected at the same time, so that the rotating speed of the high-pressure oil pump is automatically adjusted, the fuel supply requirement is met, the convenience is improved, the single cylinder engine is not damaged, and the defect that the rotating speed control method of the high-pressure oil pump in the prior art brings about the operation of the single cylinder engine is overcome.
Fig. 6 is a schematic structural diagram of a single cylinder control device provided in the embodiment of the present disclosure. As shown in fig. 6, the single cylinder control apparatus 60 includes: a first control module 601, a first detection module 602, a second control module 603, a second detection module 604, and a third control module 605.
The first control module 601 is configured to control the high-pressure oil pump to operate according to a preset low-rotation-speed default value after it is monitored that the single-cylinder engine is started.
The first detecting module 602 is configured to detect whether the output power of the single cylinder engine is greater than a preset high power limit when it is detected that the output power of the single cylinder engine is in an ascending trend.
And a second control module 603, configured to control the high-pressure oil pump to operate according to a preset high-rotation-speed default value if the output power of the single cylinder engine is greater than a preset high-power limit value.
The second detecting module 604 is configured to detect whether the output power of the single cylinder engine is smaller than a preset low-power limit value when the high-pressure oil pump operates according to a preset high-rotation-speed default value and the output power of the single cylinder engine is detected to be in a descending trend.
And a third control module 605, configured to control the high-pressure oil pump to operate according to a preset low-rotation-speed default value if the output power of the single cylinder engine is smaller than the preset low-power limit value.
It can be known from the description of the above embodiment that, this disclosed embodiment switches the high-pressure oil pump rotational speed between two rotational speed sections of predetermined low rotational speed default and predetermined high rotational speed default based on the output of single cylinder machine, has overcome the defect that the adoption PID controller carries out the messenger oil pump rotational speed that controls to the high-pressure oil pump rotational speed and changes always, has solved the problem that current single cylinder machine control method can't satisfy the fuel supply demand of single cylinder machine, has promoted the convenience, and can not produce the damage to the single cylinder machine.
In an embodiment of the disclosure, the first detecting module 602 is specifically configured to, if the output power of the single cylinder engine at any time is greater than the output power of the single cylinder engine at a time before the preset duration at any time, determine that the output power of the single cylinder engine is in an increasing trend, and detect whether the output power of the single cylinder engine is greater than a preset high power limit.
In an embodiment of the disclosure, the second detecting module 604 is specifically configured to, if the output power of the single cylinder engine at any time is smaller than the output power of the single cylinder engine at a time before the preset duration at any time, determine that the output power of the single cylinder engine is in a downward trend, and detect whether the output power of the single cylinder engine is smaller than a preset low-power limit.
In one embodiment of the present disclosure, the single cylinder control apparatus 60 further includes:
an obtaining module 606 is configured to obtain an actual rail pressure value of the common rail pipe.
And the determining module 607 is configured to determine the rail pressure deviation according to the rail pressure actual value and the rail pressure set value.
The third detecting module 608 is configured to correct the rail pressure deviation if the absolute value of the rail pressure deviation is greater than the preset threshold.
In an embodiment of the disclosure, the third detecting module 608 is specifically configured to, if the rail pressure deviation is a positive value, gradually decrease the rotation speed of the high-pressure oil pump according to a first preset step length until an absolute value of the rail pressure deviation is smaller than or equal to a preset threshold. And if the rail pressure deviation is a negative value, gradually increasing the rotating speed of the high-pressure oil pump according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
In an embodiment of the disclosure, the third detecting module 608 is further specifically configured to decrease the rotation speed of the high-pressure oil pump according to a first preset step length if the rail pressure deviation is a positive value, and after a preset time period elapses, if it is detected that the absolute value of the rail pressure deviation is still greater than a preset threshold, continue to decrease the rotation speed of the high-pressure oil pump step by step according to the first preset step length until the absolute value of the rail pressure deviation is less than or equal to the preset threshold. If the rail pressure deviation is a negative value, the rotating speed of the high-pressure oil pump is increased according to a second preset step length, after the preset time, if the absolute value of the rail pressure deviation is detected to be still smaller than the preset threshold value, the rotating speed of the pressure oil pump is continuously increased step by step according to the second preset step length until the absolute value of the rail pressure deviation is smaller than or equal to the preset threshold value.
Fig. 7 is a schematic diagram of a hardware structure of an electronic control unit ECU provided in the embodiment of the present disclosure. As shown in fig. 7, the electronic control unit ECU101 of the present embodiment includes: a processor 701 and a memory 702; wherein,
a memory 702 for storing computer-executable instructions;
processor 701 is configured to execute computer-executable instructions stored in the memory to implement the steps performed by the above-described method embodiments. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory 702 may be separate or integrated with the processor 701.
When the memory 702 is provided separately, the ECU further includes a bus 703 for connecting the memory 702 and the processor 701.
The embodiment of the disclosure also provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the processor executes the computer-executable instructions, the single-cylinder control method is implemented.
In the several embodiments provided in the present disclosure, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present disclosure may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods according to the embodiments of the present disclosure.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present disclosure are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present disclosure, and not for limiting the same; while the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims (10)

1. A single cylinder control method is characterized by being applied to an electronic control unit and comprising the following steps:
when the single-cylinder engine is monitored to be started, controlling the high-pressure oil pump to operate according to a preset low-rotation-speed default value;
when the output power of the single cylinder engine is detected to be in a rising trend, detecting whether the output power of the single cylinder engine is larger than a preset high-power limit value or not;
if the output power of the single cylinder engine is greater than the preset high power limit value, controlling the high-pressure oil pump to operate according to a preset high rotating speed default value;
when the high-pressure oil pump runs according to the preset high-rotation-speed default value and the output power of the single cylinder engine is detected to be in a descending trend, whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not is detected;
and if the output power of the single cylinder engine is smaller than the preset low-power limit value, controlling the high-pressure oil pump to operate according to the preset low-rotating-speed default value.
2. The method of claim 1, wherein when it is detected that the output power of the single cylinder engine is in an upward trend, then detecting whether the output power of the single cylinder engine is greater than a preset high power limit value comprises:
if the output power of the single cylinder engine at any moment is larger than the output power of the single cylinder engine at the moment before the preset duration at any moment, determining that the output power of the single cylinder engine is in a rising trend, and detecting whether the output power of the single cylinder engine is larger than the preset high-power limit value or not.
3. The method of claim 1, wherein when it is detected that the output power of the single cylinder engine is in a downward trend, then detecting whether the output power of the single cylinder engine is less than a preset low power limit value comprises:
if the output power of the single cylinder engine at any moment is smaller than the output power of the single cylinder engine at the moment before the preset duration at any moment, determining that the output power of the single cylinder engine is in a descending trend, and detecting whether the output power of the single cylinder engine is smaller than the preset low-power limit value.
4. The method of any of claims 1 to 3, further comprising:
acquiring a rail pressure actual value of the common rail pipe;
determining the rail pressure deviation according to the rail pressure actual value and the rail pressure set value;
and if the absolute value of the rail pressure deviation is detected to be larger than a preset threshold value, correcting the rail pressure deviation.
5. The method according to claim 4, wherein the correcting the rail pressure deviation if the absolute value of the rail pressure deviation is detected to be greater than a preset threshold value comprises:
if the rail pressure deviation is a positive value, gradually reducing the rotating speed of the high-pressure oil pump according to a first preset step length until the absolute value of the rail pressure deviation is smaller than or equal to a preset threshold value;
and if the rail pressure deviation is a negative value, gradually increasing the rotating speed of the high-pressure oil pump according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value.
6. The method of claim 5, wherein if the rail pressure deviation is positive, the step-wise decreasing the high-pressure oil pump rotation speed by a first preset step size until the absolute value of the rail pressure deviation is less than or equal to a preset threshold comprises:
if the rail pressure deviation is a positive value, reducing the rotating speed of the high-pressure oil pump according to the first preset step length, and after a preset time length, if the absolute value of the rail pressure deviation is detected to be still larger than the preset threshold value, continuously reducing the rotating speed of the high-pressure oil pump step by step according to the first preset step length until the absolute value of the rail pressure deviation is smaller than or equal to the preset threshold value;
correspondingly, if the rail pressure deviation is a negative value, the rotating speed of the high-pressure oil pump is gradually increased according to a second preset step length until the absolute value of the rail pressure deviation is less than or equal to a preset threshold value, and the method comprises the following steps:
if the rail pressure deviation is a negative value, the rotating speed of the high-pressure oil pump is increased according to the second preset step length, after the preset time length, if the absolute value of the rail pressure deviation is detected to be still smaller than the preset threshold value, the rotating speed of the high-pressure oil pump is continuously increased step by step according to the second preset step length until the absolute value of the rail pressure deviation is smaller than or equal to the preset threshold value.
7. A single cylinder control apparatus, comprising:
the first control module is used for controlling the high-pressure oil pump to operate according to a preset low-rotating-speed default value after the single-cylinder engine is monitored to be started;
the first detection module is used for detecting whether the output power of the single cylinder engine is larger than a preset high-power limit value or not when the output power of the single cylinder engine is detected to be in a rising trend;
the second control module is used for controlling the high-pressure oil pump to operate according to a preset high-rotating-speed default value if the output power of the single cylinder engine is greater than the preset high-power limit value;
the second detection module is used for detecting whether the output power of the single cylinder engine is smaller than a preset low-power limit value or not when the high-pressure oil pump operates according to the preset high-rotation-speed default value and the output power of the single cylinder engine is detected to be in a descending trend;
and the third control module is used for controlling the high-pressure oil pump to operate according to the preset low-rotating-speed default value if the output power of the single cylinder engine is smaller than the preset low-power limit value.
8. An electronic control unit, comprising: at least one processor and memory;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the single cylinder control method of any of claims 1-6.
9. A computer-readable storage medium having computer-executable instructions stored thereon which, when executed by a processor, implement the single cylinder control method of any one of claims 1 to 6.
10. A computer program product, characterized in that it comprises a computer program which, when executed by a processor, implements the single cylinder control method of any one of claims 1 to 6.
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