CN114233481A - Single-cylinder engine air intake and exhaust control method and device, electronic control unit and medium - Google Patents
Single-cylinder engine air intake and exhaust control method and device, electronic control unit and medium Download PDFInfo
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- 238000012937 correction Methods 0.000 claims description 39
- 238000012360 testing method Methods 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 3
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- 239000007789 gas Substances 0.000 description 1
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
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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
- F02D41/0002—Controlling intake air
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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
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1448—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an exhaust gas pressure
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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
- F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
- F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0614—Actual fuel mass or fuel injection amount
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
- F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
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- 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
Abstract
The embodiment of the invention discloses a method and a device for controlling air intake and exhaust of a single cylinder engine, an electronic control unit and a medium. The single-cylinder engine air inlet and exhaust control method comprises the following steps: when the engine runs, detecting the rotating speed and the fuel injection quantity of the engine in real time, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine; controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient; and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value. The control target intake and exhaust can be realized more accurately, rapidly and effectively, and the intake and exhaust state equivalent to that of a multi-cylinder machine can be obtained.
Description
Technical Field
The embodiment of the invention relates to the technical field of single-cylinder engine control, in particular to a single-cylinder engine air intake and exhaust control method, a single-cylinder engine air intake and exhaust control device, an electronic control unit and a medium.
Background
The single cylinder engine is the most original state of all engines and is the most common engine at present, and all multi-cylinder engines can be regarded as single cylinder engines combined according to different arrangement modes. For multi-cylinder engines, especially large-cylinder-diameter and high-power products, the product development process is complex, the cost of parts, fuel and manpower is high, the test period is long, the benefits are obvious if single-cylinder engine assistance is provided, and the engine huge heads at home and abroad have single-cylinder engine development technologies, so that the single-cylinder engine assistance multi-cylinder engine development is an indispensable and significant technical means.
The conventional product engine is ventilated through a supercharger, the air inlet pressure and the exhaust pressure of the supercharger can only be constant at the same working point, a single cylinder engine is only used for assisting a multi-cylinder engine test, and the air inlet and exhaust states of the single cylinder engine are controlled to be equivalent to those of the multi-cylinder engine, so that the single cylinder engine and the multi-cylinder engine are in the same state during the single cylinder engine test, and the development direction of the multi-cylinder engine is correctly guided. At present, the opening of a butterfly valve can be slowly adjusted only by manual operation in the process of controlling air intake and exhaust on a test bed, and the adjusting process is long and not accurate enough.
Disclosure of Invention
The embodiment of the invention provides a single-cylinder engine air intake and exhaust control method, a single-cylinder engine air intake and exhaust control device, an electronic control unit and a single-cylinder engine air intake and exhaust control medium, so that the aim of controlling air intake and exhaust can be accurately, quickly and effectively achieved, and an air intake and exhaust state equivalent to that of a multi-cylinder engine is obtained.
In a first aspect, an embodiment of the present invention provides a single-cylinder engine intake and exhaust control method, where the single-cylinder engine intake and exhaust control method includes:
when the engine runs, detecting the rotating speed and the fuel injection quantity of the engine in real time, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine;
controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient;
and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value.
Further, before the engine runs, the method also comprises the following steps:
generating an engine intake pressure basic value MAP table, an excess air coefficient MAP table and an engine exhaust pressure basic value MAP table based on the rotation speed and the fuel injection quantity of the engine based on configured universal test data of the multi-cylinder engine;
and calibrating and generating an engine intake pressure correction value MAP table and an engine exhaust pressure correction value MAP table according to the engine intake pressure basic value MAP table and the engine exhaust pressure basic value MAP table.
Further, determining an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value according to the engine speed and the fuel injection quantity, and the method comprises the following steps:
checking the engine intake pressure basic value MAP table, the excess air coefficient MAP table and the engine exhaust pressure basic value MAP table according to the engine rotating speed and the fuel injection quantity, and respectively and correspondingly obtaining an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value;
after the engine intake pressure basic value, the excess air coefficient set value and the engine exhaust pressure basic value are determined according to the engine speed and the fuel injection quantity, the method further comprises the following steps:
and checking the engine intake pressure correction value MAP table and the engine exhaust pressure correction value MAP table according to the engine rotating speed and the fuel injection quantity, and determining an engine intake pressure correction value and an engine exhaust pressure correction value.
Further, before controlling the operation of an intake butterfly valve based on the engine intake pressure basic value and controlling the excess air ratio set value to reach an excess air ratio target value, the method further includes:
measuring an actual value of the excess air coefficient by an oxygen sensor arranged on the exhaust pipe;
and generating an air inlet butterfly valve action command according to the set value of the excess air coefficient and the actual value of the excess air coefficient.
Further, controlling the action of an air inlet butterfly valve based on the engine air inlet pressure basic value and controlling the set value of the excess air coefficient to reach the target value of the excess air coefficient comprises the following steps:
and after controlling the action of the air inlet butterfly valve based on the basic value of the air inlet pressure of the engine, controlling the air inlet butterfly valve to act again according to the received action command of the air inlet butterfly valve until the set value of the excess air coefficient is controlled to reach the target value of the excess air coefficient.
Further, controlling an exhaust butterfly valve to act based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value, includes:
acquiring an actual value of the exhaust pressure of the engine, and determining a set value of the exhaust pressure of the engine based on the basic value of the exhaust pressure of the engine and the corrected value of the exhaust pressure of the engine;
and controlling an exhaust butterfly valve to act according to the actual value of the exhaust pressure of the engine and the set value of the exhaust pressure of the engine, and controlling the basic value of the exhaust pressure of the engine to reach the target value of the exhaust pressure of the engine.
Further, the single-cylinder engine intake and exhaust control method further comprises the following steps:
and controlling the engine intake pressure supplied by the external equipment to be greater than the sum of the engine intake pressure basic value and the engine intake pressure correction value.
In a second aspect, an embodiment of the present invention further provides a single-cylinder engine intake and exhaust control apparatus, where the single-cylinder engine intake and exhaust control apparatus includes:
the information acquisition module is used for detecting the rotating speed and the fuel injection quantity of the engine in real time when the engine runs, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine;
the air inlet butterfly valve control module is used for controlling the action of an air inlet butterfly valve based on the engine air inlet pressure basic value and controlling the set value of the excess air coefficient to reach the target value of the excess air coefficient;
and the exhaust butterfly valve control module is used for controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value.
In a third aspect, an embodiment of the present invention further provides an electronic control unit, including:
one or more processors;
a storage device for storing a plurality of programs,
when at least one of the programs is executed by the one or more processors, the one or more processors are caused to implement the method for controlling intake and exhaust of a single cylinder engine provided in the embodiment of the first aspect of the present invention.
In a fourth aspect, the embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for controlling intake and exhaust of a single cylinder engine provided in the embodiments of the first aspect of the present invention.
According to the technical scheme of the embodiment of the invention, the rotating speed and the fuel injection quantity of the engine are detected in real time when the engine runs, and the intake pressure basic value, the excess air coefficient set value and the exhaust pressure basic value of the engine are determined according to the rotating speed and the fuel injection quantity of the engine; controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient; and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value. The problems that the opening of a butterfly valve can only be slowly adjusted manually by controlling air intake and exhaust on the existing test bed, the adjusting process is long and not accurate enough are solved, the air intake and exhaust of a control target are realized more accurately, quickly and effectively, and the air intake and exhaust state equivalent to that of a multi-cylinder machine is obtained.
Drawings
FIG. 1 is a flow chart of a method for controlling intake and exhaust of a single cylinder engine according to an embodiment of the present invention;
FIG. 2 is a flow chart of a single cylinder engine intake and exhaust control method according to a second embodiment of the present invention;
FIG. 3 is a structural diagram of an intake and exhaust control device for a single cylinder engine according to a third embodiment of the present invention;
fig. 4 is a schematic diagram of a hardware structure of an electronic control unit according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention.
It should be further noted that, for the convenience of description, only some but not all of the relevant aspects of the present invention are shown in the drawings. Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Example one
Fig. 1 is a flowchart of a single-cylinder engine intake and exhaust control method according to an embodiment of the present invention, where the embodiment is applicable to a case where an electronic control unit ECU controls an opening of an intake and exhaust butterfly valve to adjust an intake and exhaust flow and a pressure, and the single-cylinder engine intake and exhaust control method may be executed by a single-cylinder engine intake and exhaust control device, and the single-cylinder engine intake and exhaust control device may be implemented in software and/or hardware. The single-cylinder engine air intake and exhaust control method specifically comprises the following steps:
and S110, when the engine runs, detecting the rotating speed and the fuel injection quantity of the engine in real time, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine.
The engine of the embodiment is a single-cylinder engine, the single-cylinder engine is an engine with only one cylinder, and the embodiment is equivalent to a multi-cylinder engine by controlling the air intake and exhaust states of the single-cylinder engine, so that correct guidance is provided for the development direction of the multi-cylinder engine.
The excess air factor is equal to the intake air quantity/the oil consumption/14.3, and represents a ratio of the actual intake air quantity to the theoretical intake air quantity, represents the charging efficiency or capacity of the engine, and is a parameter which is more significant than the intake pressure.
In this embodiment, before the engine is operated, the method further includes: generating an engine intake pressure basic value MAP table, an excess air coefficient MAP table and an engine exhaust pressure basic value MAP table based on the rotation speed and the fuel injection quantity of the engine based on configured universal test data of the multi-cylinder engine; and calibrating and generating an engine intake pressure correction value MAP table and an engine exhaust pressure correction value MAP table according to the engine intake pressure basic value MAP table and the engine exhaust pressure basic value MAP table.
The multi-cylinder engine universal test data is data corresponding to all working condition points of the engine in an operable range.
Specifically, based on universal test data of multi-cylinder engines with any configuration, an engine intake pressure basic value MAP table, an excess air coefficient MAP table and an engine exhaust pressure basic value MAP table based on the rotating speed and the fuel injection quantity are calculated, and an engine intake pressure correction value MAP table and an engine exhaust pressure correction value MAP table are pre-calibrated to adapt to different engine configurations.
Further, on the basis of the above embodiment, determining the basic value of the intake pressure, the setting value of the excess air factor and the basic value of the exhaust pressure of the engine according to the engine speed and the fuel injection quantity includes: checking the engine intake pressure basic value MAP table, the excess air coefficient MAP table and the engine exhaust pressure basic value MAP table according to the engine rotating speed and the fuel injection quantity, and respectively and correspondingly obtaining an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value;
after the engine intake pressure basic value, the excess air coefficient set value and the engine exhaust pressure basic value are determined according to the engine speed and the fuel injection quantity, the method further comprises the following steps: and checking the engine intake pressure correction value MAP table and the engine exhaust pressure correction value MAP table according to the engine rotating speed and the fuel injection quantity, and determining an engine intake pressure correction value and an engine exhaust pressure correction value.
And S120, controlling the action of an air inlet butterfly valve based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach the target value of the excess air coefficient.
Wherein an intake butterfly valve is installed between an external device and an engine, and the intake butterfly valve is a valve for controlling an intake air flow rate and pressure.
Specifically, during the operation of the engine, the external device supplies the charge air slightly larger than the set value of the intake pressure, that is, the basic value of the intake pressure of the engine of the embodiment, and after the charge air passes through the intake butterfly valve, the pressure is reduced to different degrees according to different opening degrees of the butterfly valve.
In addition to the above, the method further includes, before controlling the operation of an intake butterfly valve based on the engine intake pressure basic value and controlling the excess air ratio set value to reach an excess air ratio target value: measuring an actual value of the excess air coefficient by an oxygen sensor arranged on the exhaust pipe; and generating an air inlet butterfly valve action command according to the set value of the excess air coefficient and the actual value of the excess air coefficient.
Wherein, the oxygen sensor is arranged behind the exhaust butterfly valve and used for measuring the excess air coefficient in real time.
Further, in the above-described embodiments, controlling the excess air ratio set value to reach the excess air ratio target value by controlling the operation of the intake butterfly valve based on the engine intake pressure basic value includes: and after controlling the action of the air inlet butterfly valve based on the basic value of the air inlet pressure of the engine, controlling the air inlet butterfly valve to act again according to the received action command of the air inlet butterfly valve until the set value of the excess air coefficient is controlled to reach the target value of the excess air coefficient.
Specifically, after the air inlet butterfly valve is controlled to act based on the engine air inlet pressure basic value, an excess air coefficient set value is achieved, an excess air coefficient actual value is obtained through measurement of an oxygen sensor installed on an exhaust pipe, an output voltage signal is calculated by a PID regulator according to the deviation between the excess air coefficient set value and the excess air coefficient actual value, an air inlet butterfly valve action command is generated, the air inlet butterfly valve is controlled to act again until the excess air coefficient set value is controlled to reach an excess air coefficient target value, and the excess air coefficient is stably maintained at the excess air coefficient target value.
And S130, controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value.
Wherein the exhaust butterfly valve is installed between the engine and the exhaust gas suction device, and the exhaust butterfly valve is a valve for controlling the exhaust flow and pressure
On the basis of the above embodiment, controlling the operation of the exhaust butterfly valve based on the engine exhaust pressure basic value and controlling the engine exhaust pressure basic value to reach the engine exhaust pressure target value includes: acquiring an actual value of the exhaust pressure of the engine, and determining a set value of the exhaust pressure of the engine based on the basic value of the exhaust pressure of the engine and the corrected value of the exhaust pressure of the engine; and controlling an exhaust butterfly valve to act according to the actual value of the exhaust pressure of the engine and the set value of the exhaust pressure of the engine, and controlling the basic value of the exhaust pressure of the engine to reach the target value of the exhaust pressure of the engine.
Specifically, after the operation of the intake butterfly valve is controlled based on the engine intake pressure basic value, the excess air coefficient set value is realized, and meanwhile, the electronic control unit ECU calculates an output voltage signal by a PID regulator based on the deviation between the engine exhaust pressure actual value and the engine exhaust pressure set value, controls the operation of the exhaust butterfly valve, and controls the engine exhaust pressure basic value to reach the engine exhaust pressure target value, namely controls the exhaust pressure to be stably maintained at the engine exhaust pressure target value.
It can be understood that, the exhaust butterfly valve is controlled to act to realize the set value of the exhaust pressure of the engine, but the exhaust pressure of the engine changes, even if the intake pressure of the engine is not changed, the excess air coefficient also changes, so that the intake butterfly valve acts again, and likewise, the exhaust pressure of the engine changes, therefore, the intake butterfly valve and the exhaust butterfly valve are a continuous dynamic adjusting process, the deviation is gradually reduced, the excess air coefficient and the exhaust pressure of the engine can be controlled to the set value to stably operate by slow convergence, and the embodiment realizes that the automatic control is faster and more accurate than the manual adjustment.
Further, in the above embodiment, the engine intake pressure supplied from the external device is controlled to be greater than the sum of the engine intake pressure base value and the engine intake pressure correction value.
The external device is an air conditioner, which is not limited in this embodiment.
Specifically, under any working condition of the engine, the intake pressure of the engine supplied by the external equipment, namely the intake pressure of the butterfly valve, is higher than the sum of the basic value of the intake pressure of the engine and the correction value of the intake pressure of the engine, and the intake pressure of the butterfly valve is not lower than the basic value of the intake pressure of the engine and the correction value of the intake pressure of the engine too much when the intake butterfly valve is partially closed, so that sufficient intake is ensured to realize the control of the excess air coefficient.
According to the technical scheme of the embodiment of the invention, the rotating speed and the fuel injection quantity of the engine are detected in real time when the engine runs, and the intake pressure basic value, the excess air coefficient set value and the exhaust pressure basic value of the engine are determined according to the rotating speed and the fuel injection quantity of the engine; controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient; and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value. The problems that the opening of a butterfly valve can only be slowly adjusted manually by controlling air intake and exhaust on the existing test bed, the adjusting process is long and not accurate enough are solved, the air intake and exhaust of a control target are realized more accurately, quickly and effectively, and the air intake and exhaust state equivalent to that of a multi-cylinder machine is obtained.
Example two
Fig. 2 is a flowchart of a single-cylinder engine intake and exhaust control method according to a second embodiment of the present invention, which is optimized based on the second embodiment.
Correspondingly, the method of the embodiment specifically includes:
and S210, controlling the engine intake pressure supplied by the external equipment to be larger than the sum of the engine intake pressure basic value and the engine intake pressure correction value.
And S220, generating an engine intake pressure basic value MAP table, an excess air coefficient MAP table and an engine exhaust pressure basic value MAP table based on the rotation speed and the fuel injection quantity of the engine based on configured multi-cylinder engine universal test data.
And S230, calibrating and generating an engine intake pressure correction value MAP table and an engine exhaust pressure correction value MAP table according to the engine intake pressure basic value MAP table and the engine exhaust pressure basic value MAP table.
And S240, detecting the rotating speed and the fuel injection quantity of the engine in real time when the engine runs.
And S250, checking the engine intake pressure basic value MAP table, the excess air coefficient MAP table and the engine exhaust pressure basic value MAP table according to the engine rotating speed and the fuel injection quantity, and respectively and correspondingly obtaining an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value.
And S260, checking the engine intake pressure correction value MAP table and the engine exhaust pressure correction value MAP table according to the engine rotating speed and the fuel injection quantity, and determining an engine intake pressure correction value and an engine exhaust pressure correction value.
And S270, measuring by an oxygen sensor arranged on the exhaust pipe to obtain an actual value of the excess air coefficient, and generating an air inlet butterfly valve action instruction according to the set value of the excess air coefficient and the actual value of the excess air coefficient.
And S280, controlling the action of an air inlet butterfly valve based on the basic value of the air inlet pressure of the engine to realize an excess air coefficient set value, controlling the excess air coefficient set value to reach an excess air coefficient target value, and controlling the action of an exhaust butterfly valve based on the actual value of the exhaust pressure of the engine and the set value of the exhaust pressure of the engine to control the basic value of the exhaust pressure of the engine to reach the target value of the exhaust pressure of the engine.
Further, controlling the action of an air inlet butterfly valve based on the engine air inlet pressure basic value and controlling the set value of the excess air coefficient to reach the target value of the excess air coefficient comprises the following steps: and after controlling the action of the air inlet butterfly valve based on the basic value of the air inlet pressure of the engine, controlling the air inlet butterfly valve to act again according to the received action command of the air inlet butterfly valve until the set value of the excess air coefficient is controlled to reach the target value of the excess air coefficient.
According to the single-cylinder engine air intake and exhaust control method provided by the embodiment of the invention, the electronic control unit ECU controls the opening of the air intake and exhaust butterfly valve and adjusts the air intake and exhaust flow and pressure to obtain the air intake and exhaust state equivalent to that of a multi-cylinder engine, manual adjustment is not needed, the electronic control unit ECU automatically controls to obtain the air intake and exhaust state equivalent to that of the multi-cylinder engine through the set air intake and exhaust pressure and excess air coefficient, the control target can be accurately, quickly and effectively realized, and the air intake and exhaust state equivalent to that of the multi-cylinder engine is obtained.
EXAMPLE III
Fig. 3 is a structural diagram of a single-cylinder engine intake and exhaust control device according to a third embodiment of the present invention, which is applicable to a case where an electronic control unit ECU controls an opening of an intake and exhaust butterfly valve to adjust an intake and exhaust flow and a pressure.
As shown in fig. 3, the single cylinder engine intake and exhaust control apparatus includes: an information acquisition module 310, an intake butterfly valve control module 320, and an exhaust butterfly valve control module 330, wherein:
the information acquisition module 310 is used for detecting the rotating speed and the fuel injection quantity of the engine in real time when the engine runs, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine;
the air inlet butterfly valve control module 320 is used for controlling the action of an air inlet butterfly valve based on the engine air inlet pressure basic value and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient;
and the exhaust butterfly valve control module 330 is configured to control an exhaust butterfly valve to act based on the engine exhaust pressure basic value, and control the engine exhaust pressure basic value to reach an engine exhaust pressure target value, so as to control the engine to stably operate according to the excess air factor target value and the engine exhaust pressure target value.
The single-cylinder engine intake and exhaust control device of the embodiment detects the rotating speed and the fuel injection quantity of an engine in real time when the engine runs, and determines an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value according to the rotating speed and the fuel injection quantity of the engine; controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient; and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value. The problems that the opening of a butterfly valve can only be slowly adjusted manually by controlling air intake and exhaust on the existing test bed, the adjusting process is long and not accurate enough are solved, the air intake and exhaust of a control target are realized more accurately, quickly and effectively, and the air intake and exhaust state equivalent to that of a multi-cylinder machine is obtained.
On the basis of the above embodiments, before the engine is operated, the method further includes:
generating an engine intake pressure basic value MAP table, an excess air coefficient MAP table and an engine exhaust pressure basic value MAP table based on the rotation speed and the fuel injection quantity of the engine based on configured universal test data of the multi-cylinder engine;
and calibrating and generating an engine intake pressure correction value MAP table and an engine exhaust pressure correction value MAP table according to the engine intake pressure basic value MAP table and the engine exhaust pressure basic value MAP table.
On the basis of the above embodiments, determining an engine intake pressure basic value, an excess air factor setting value, and an engine exhaust pressure basic value according to the engine speed and the fuel injection quantity includes:
checking the engine intake pressure basic value MAP table, the excess air coefficient MAP table and the engine exhaust pressure basic value MAP table according to the engine rotating speed and the fuel injection quantity, and respectively and correspondingly obtaining an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value;
after the engine intake pressure basic value, the excess air coefficient set value and the engine exhaust pressure basic value are determined according to the engine speed and the fuel injection quantity, the method further comprises the following steps:
and checking the engine intake pressure correction value MAP table and the engine exhaust pressure correction value MAP table according to the engine rotating speed and the fuel injection quantity, and determining an engine intake pressure correction value and an engine exhaust pressure correction value.
In addition to the above embodiments, before controlling the operation of the intake butterfly valve based on the engine intake pressure basic value and controlling the excess air ratio set value to reach the excess air ratio target value, the method further includes:
measuring an actual value of the excess air coefficient by an oxygen sensor arranged on the exhaust pipe;
and generating an air inlet butterfly valve action command according to the set value of the excess air coefficient and the actual value of the excess air coefficient.
In addition to the above embodiments, the controlling the excess air ratio set value to reach the excess air ratio target value by controlling the operation of the intake butterfly valve based on the engine intake pressure basic value includes:
and after controlling the action of the air inlet butterfly valve based on the basic value of the air inlet pressure of the engine, controlling the air inlet butterfly valve to act again according to the received action command of the air inlet butterfly valve until the set value of the excess air coefficient is controlled to reach the target value of the excess air coefficient.
In addition to the above embodiments, the controlling an exhaust butterfly valve based on the engine exhaust pressure basic value to control the engine exhaust pressure basic value to reach an engine exhaust pressure target value includes:
acquiring an actual value of the exhaust pressure of the engine, and determining a set value of the exhaust pressure of the engine based on the basic value of the exhaust pressure of the engine and the corrected value of the exhaust pressure of the engine;
and controlling an exhaust butterfly valve to act according to the actual value of the exhaust pressure of the engine and the set value of the exhaust pressure of the engine, and controlling the basic value of the exhaust pressure of the engine to reach the target value of the exhaust pressure of the engine.
On the basis of the above embodiments, the single-cylinder engine intake and exhaust control device further includes:
and controlling the engine intake pressure supplied by the external equipment to be greater than the sum of the engine intake pressure basic value and the engine intake pressure correction value.
The single-cylinder engine air intake and exhaust control device provided by each embodiment can execute the single-cylinder engine air intake and exhaust control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the single-cylinder engine air intake and exhaust control method.
Example four
Fig. 4 is a schematic structural diagram of an electronic control unit according to a fourth embodiment of the present invention, as shown in fig. 4, the electronic control unit includes a processor 410, a memory 420, an input device 430, and an output device 440; the number of the processors 410 in the electronic control unit may be one or more, and one processor 410 is taken as an example in fig. 4; the processor 410, the memory 420, the input device 430 and the output device 440 in the electronic control unit may be connected by a bus or other means, and the connection by the bus is exemplified in fig. 4.
The memory 420 serves as a computer-readable storage medium and may be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the single-cylinder air intake and exhaust control method in the embodiment of the present invention (for example, the information acquisition module 310, the air intake butterfly valve control module 320, and the air exhaust butterfly valve control module 330 in the single-cylinder air intake and exhaust control device). The processor 410 executes software programs, instructions and modules stored in the memory 420 to execute various functional applications of the electronic control unit and data processing, namely, to realize the single-cylinder air intake and exhaust control method.
The memory 420 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 420 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 420 may further include memory located remotely from the processor 410, which may be connected to the electronic control unit via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 430 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the electronic control unit. The output device 440 may include a display device such as a display screen.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform a single-cylinder air intake and exhaust control method, including:
when the engine runs, detecting the rotating speed and the fuel injection quantity of the engine in real time, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine;
controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient;
and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the method for controlling intake and exhaust of a single cylinder engine provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the single-cylinder engine intake and exhaust control device, the units and modules included in the embodiment are merely divided according to the functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for controlling air intake and exhaust of a single cylinder engine is characterized by comprising the following steps:
when the engine runs, detecting the rotating speed and the fuel injection quantity of the engine in real time, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine;
controlling an air inlet butterfly valve to act based on the engine air inlet pressure basic value, and controlling the set value of the excess air coefficient to reach a target value of the excess air coefficient;
and controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value, and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value.
2. The single cylinder engine intake and exhaust control method according to claim 1, further comprising, before the engine is running:
generating an engine intake pressure basic value MAP table, an excess air coefficient MAP table and an engine exhaust pressure basic value MAP table based on the rotation speed and the fuel injection quantity of the engine based on configured universal test data of the multi-cylinder engine;
and calibrating and generating an engine intake pressure correction value MAP table and an engine exhaust pressure correction value MAP table according to the engine intake pressure basic value MAP table and the engine exhaust pressure basic value MAP table.
3. The single cylinder engine intake and exhaust control method of claim 2, wherein determining an engine intake pressure baseline, an excess air factor set point, and an engine exhaust pressure baseline from the engine speed and fuel injection quantity comprises:
checking the engine intake pressure basic value MAP table, the excess air coefficient MAP table and the engine exhaust pressure basic value MAP table according to the engine rotating speed and the fuel injection quantity, and respectively and correspondingly obtaining an engine intake pressure basic value, an excess air coefficient set value and an engine exhaust pressure basic value;
after the engine intake pressure basic value, the excess air coefficient set value and the engine exhaust pressure basic value are determined according to the engine speed and the fuel injection quantity, the method further comprises the following steps:
and checking the engine intake pressure correction value MAP table and the engine exhaust pressure correction value MAP table according to the engine rotating speed and the fuel injection quantity, and determining an engine intake pressure correction value and an engine exhaust pressure correction value.
4. The single cylinder engine intake and exhaust control method of claim 1, further comprising, before controlling the excess air factor set value to the excess air factor target value by controlling an intake butterfly valve action based on the engine intake pressure base value:
measuring an actual value of the excess air coefficient by an oxygen sensor arranged on the exhaust pipe;
and generating an air inlet butterfly valve action command according to the set value of the excess air coefficient and the actual value of the excess air coefficient.
5. The single cylinder engine intake and exhaust control method of claim 4, wherein controlling the excess air factor setting to an excess air factor target value based on controlling an intake butterfly valve action based on the engine intake pressure base value comprises:
and after controlling the action of the air inlet butterfly valve based on the basic value of the air inlet pressure of the engine, controlling the air inlet butterfly valve to act again according to the received action command of the air inlet butterfly valve until the set value of the excess air coefficient is controlled to reach the target value of the excess air coefficient.
6. The single cylinder engine intake and exhaust control method according to claim 3, wherein controlling an exhaust butterfly valve action based on the engine exhaust pressure base value and controlling the engine exhaust pressure base value to reach an engine exhaust pressure target value comprises:
acquiring an actual value of the exhaust pressure of the engine, and determining a set value of the exhaust pressure of the engine based on the basic value of the exhaust pressure of the engine and the corrected value of the exhaust pressure of the engine;
and controlling an exhaust butterfly valve to act according to the actual value of the exhaust pressure of the engine and the set value of the exhaust pressure of the engine, and controlling the basic value of the exhaust pressure of the engine to reach the target value of the exhaust pressure of the engine.
7. The single cylinder engine intake and exhaust control method according to claim 3, further comprising:
and controlling the engine intake pressure supplied by the external equipment to be greater than the sum of the engine intake pressure basic value and the engine intake pressure correction value.
8. An intake and exhaust control device for a single cylinder engine, comprising:
the information acquisition module is used for detecting the rotating speed and the fuel injection quantity of the engine in real time when the engine runs, and determining an intake pressure basic value, an excess air coefficient set value and an exhaust pressure basic value of the engine according to the rotating speed and the fuel injection quantity of the engine;
the air inlet butterfly valve control module is used for controlling the action of an air inlet butterfly valve based on the engine air inlet pressure basic value and controlling the set value of the excess air coefficient to reach the target value of the excess air coefficient;
and the exhaust butterfly valve control module is used for controlling the action of an exhaust butterfly valve based on the engine exhaust pressure basic value and controlling the engine exhaust pressure basic value to reach an engine exhaust pressure target value so as to control the engine to stably run according to the excess air coefficient target value and the engine exhaust pressure target value.
9. An electronic control unit, characterized in that it comprises:
one or more processors;
storage means for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the single cylinder engine induction and exhaust control method of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the single-cylinder engine intake-exhaust control method according to any one of claims 1 to 7.
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