CN112963252A - Emission control method, device and equipment of engine - Google Patents
Emission control method, device and equipment of engine Download PDFInfo
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- CN112963252A CN112963252A CN202110290919.9A CN202110290919A CN112963252A CN 112963252 A CN112963252 A CN 112963252A CN 202110290919 A CN202110290919 A CN 202110290919A CN 112963252 A CN112963252 A CN 112963252A
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/224—Diagnosis of the fuel system
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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
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The embodiment of the application discloses an emission control method, device and equipment of an engine. In this way, by adjusting the air-fuel ratio of the engine in the failure state, the treatment efficiency of the catalyst can be ensured to be high in the engine failure state, and the discharged waste gas meets the emission requirement of the gas. And the fault grade of the type fault of the injection valve is reduced, and the reliability and the fault adaptability of the engine are improved.
Description
Technical Field
The application relates to the field of engine control, in particular to an emission control method, device and equipment of an engine.
Background
The engine is provided with a cylinder body and a corresponding injection valve, and the injection valve is used for injecting fuel into the cylinder body to realize the combustion of the fuel in the cylinder body.
When the injection valve breaks down, the concentration of fuel that probably leads to having in the cylinder body changes for the waste gas that the engine generated increases, can't handle, and then leads to the emission of waste gas to be not conform to the environmental protection needs. Therefore, how to control the emission of the engine under the fault condition so that the emission of the engine meets the emission requirement is an urgent problem to be solved.
Disclosure of Invention
In view of this, embodiments of the present application provide an emission control method, apparatus, and device for an engine, which can control an air-fuel ratio of the engine based on a working condition of the engine, so that the emission of the engine meets an environmental protection requirement.
In order to solve the above problem, the technical solution provided by the embodiment of the present application is as follows:
in a first aspect, the present application provides a method of emission control of an engine, the method comprising:
acquiring operating parameters of an engine, wherein the operating parameters comprise operating parameters of an injection valve and working condition parameters of the engine;
judging whether an injection valve of the engine is in a fault state or not according to the injection valve operation parameters;
if the injection valve is in a fault state, acquiring air-fuel ratio offset corresponding to the working condition parameters of the engine;
and adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset.
In one possible implementation, before the determining whether an injection valve of the engine is in a fault state according to the injection valve operating parameter, the method further includes:
and determining that the engine meets a preset adjusting condition according to the engine working condition parameters.
In one possible implementation, the engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters;
the preset adjustment condition is that the engine speed is greater than or equal to a preset speed threshold, the engine intake charge is greater than or equal to a preset intake charge, and the ignition system is operating normally.
In one possible implementation, the injection valve operating parameter includes a number of injection valve failures; before the adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset amount, the method further includes:
acquiring a correction coefficient corresponding to the number of the faults of the injection valve;
and calculating the product of the air-fuel ratio offset and the correction coefficient to obtain an updated air-fuel ratio offset.
In one possible implementation, if the engine is in a normal state, the method further includes:
acquiring an air-fuel ratio adjustment amount corresponding to the engine working condition parameter;
and adjusting the air-fuel ratio of the engine according to the air-fuel ratio adjustment amount.
In one possible implementation, the adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset amount includes:
acquiring a current air-fuel ratio set value of the engine, and adding the current air-fuel ratio set value and the air-fuel ratio offset to obtain an adjusted air-fuel ratio set value;
setting an air-fuel ratio of the engine to the adjusted air-fuel ratio setting value.
In one possible implementation, the air-fuel ratio offset amount is set in advance in accordance with the conversion efficiency of a catalyst in the exhaust system.
In a second aspect, the present application provides an emission control device of an engine, the device comprising:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring the operation parameters of the engine, and the operation parameters comprise the operation parameters of an injection valve and the working condition parameters of the engine;
the judging unit is used for judging whether an injection valve of the engine is in a fault state or not according to the injection valve operation parameters;
the second acquisition unit is used for acquiring air-fuel ratio offset corresponding to the working condition parameters of the engine if the injection valve is in a fault state;
and the first adjusting unit is used for adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset.
In one possible implementation, the apparatus further includes:
and the determining unit is used for determining that the engine meets a preset adjusting condition according to the engine working condition parameters.
In one possible implementation, the engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters;
the preset adjustment condition is that the engine speed is greater than or equal to a preset speed threshold, the engine intake charge is greater than or equal to a preset intake charge, and the ignition system is operating normally.
In one possible implementation, the apparatus further includes:
a third acquisition unit configured to acquire a correction coefficient corresponding to the number of failures of the injection valve;
and the calculation unit is used for calculating the product of the air-fuel ratio offset and the correction coefficient to obtain an updated air-fuel ratio offset.
In one possible implementation, the apparatus further includes:
the fourth acquisition unit is used for acquiring the air-fuel ratio adjustment amount corresponding to the engine working condition parameter;
and the second adjusting unit is used for adjusting the air-fuel ratio of the engine according to the air-fuel ratio adjusting amount.
In a possible implementation manner, the first adjusting unit specifically includes:
acquiring a current air-fuel ratio set value of the engine, and adding the current air-fuel ratio set value and the air-fuel ratio offset to obtain an adjusted air-fuel ratio set value;
setting an air-fuel ratio of the engine to the adjusted air-fuel ratio setting value.
In one possible implementation, the air-fuel ratio offset amount is set in advance in accordance with the conversion efficiency of a catalyst in the exhaust system.
In a third aspect, the present application provides an emission control apparatus of an engine, comprising: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is used for storing one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of the above embodiment.
In a fourth aspect, the present application provides a computer-readable storage medium, which stores instructions that, when executed on a terminal device, cause the terminal device to perform the method of the foregoing embodiment.
Therefore, the embodiment of the application has the following beneficial effects:
according to the emission control method, the device and the equipment of the engine, the operation parameters of the engine are obtained, whether the injection valve is in a fault state or not is judged by using the operation parameters of the injection valve in the operation parameters, if yes, the corresponding air-fuel ratio offset is further obtained according to the working condition parameters of the engine in the operation parameters of the engine, and then the air-fuel ratio of the engine is adjusted according to the air-fuel ratio offset. In this way, by adjusting the air-fuel ratio of the engine in the failure state, the treatment efficiency of the catalyst can be ensured to be high in the engine failure state, and the discharged waste gas meets the emission requirement of the gas. And the fault grade of the type fault of the injection valve is reduced, and the reliability and the fault adaptability of the engine are improved.
Drawings
FIG. 1 is a flow chart of a method for controlling emissions from an engine according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for controlling emissions from an engine according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an emission control device of an engine according to an embodiment of the present application.
Detailed Description
In order to facilitate understanding and explaining the technical solutions provided by the embodiments of the present application, the following description will first describe the background art of the present application.
After studying the emission of the traditional engine, the inventor finds that the engine injects fuel into a cylinder through an injection valve, so that the fuel is mixed with air, and then the fuel is ignited to provide power. The ratio of air to fuel mixture affects the composition of the exhaust gas produced by the combustion of the fuel. The catalytic treatment is carried out on the waste gas through the catalytic converter, so that the content of pollution components in the waste gas can be reduced, and the waste gas can meet the emission requirement. However, when an injection valve in an engine malfunctions, it is difficult to distribute the fuel more uniformly in the cylinders, the fuel content in some cylinders is low, and the fuel combustion is insufficient, resulting in a high content of pollutant components in the engine exhaust gas. In addition, the conversion efficiency of the catalyst is also affected, so that the content of pollutant components in the discharged waste gas is high, and the requirement of emission standard cannot be met. Specifically, taking a 6-cylinder engine with single-point injection as an example, the working sequence is 1-5-3-6-2-4, and the fuel injection is executed in the working sequence of the cylinder blocks in the engine. For example, when 4-cylinder injection valves are out of order, only the remaining 5 injection valves can work normally, and the fuel injection cannot achieve uniform coverage of 6 cylinders, so that the air-fuel ratio of air and fuel is low when some cylinders work, and more NOx is generated during fuel combustion in an engine. In addition, the conversion efficiency of the catalyst is also reduced by the influence of the air-fuel ratio, so that the content of the pollutant gas in the discharged exhaust gas is high, and the exhaust gas cannot meet the exhaust emission standard.
Based on this, the embodiment of the application provides an emission control method of an engine, which includes obtaining operation parameters of the engine, firstly, judging whether an injection valve is in a fault state by using the operation parameters of the injection valve in the operation parameters, if so, further obtaining a corresponding air-fuel ratio offset according to engine working condition parameters in the operation parameters of the engine, and then, adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset. In this way, by adjusting the air-fuel ratio of the engine in the failure state, the treatment efficiency of the catalyst can be ensured to be high in the engine failure state, and the discharged waste gas meets the emission requirement of the gas.
In order to facilitate understanding of the technical solutions provided by the embodiments of the present application, an emission control method of an engine provided by the embodiments of the present application is described below with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of an emission control method of an engine according to an embodiment of the present disclosure is shown, and the method includes steps S101 to S104.
S101: the method comprises the steps of obtaining operation parameters of the engine, wherein the operation parameters comprise injection valve operation parameters and engine working condition parameters.
Operating parameters of the engine are obtained while the engine is running. The operation parameters refer to relevant parameters generated in the operation process of the engine, and the operation parameters at least comprise injection valve operation parameters and engine working condition parameters. The injection valve operating parameter is an operating parameter for indicating an operating state of the injection valve, and whether the injection valve is operating normally can be determined based on the injection valve operating parameter. The engine working condition parameters refer to relevant parameters of the engine under different running working conditions, and the running state of the engine can be determined according to the engine working condition parameters.
The embodiment of the application does not limit the specific acquisition mode of the engine operation parameters, and the engine operation parameters can be acquired according to a detection system arranged in the engine.
S102: and judging whether the injection valve of the engine is in a fault state or not according to the injection valve operation parameters.
Based on the operation parameters of the injection valves in the acquired operation parameters, the operation state of each injection valve can be determined, and whether the injection valve of the engine is in a failure state or not can be judged. In one possible implementation, the injection valve operating parameters may include parameters related to the operating state of the injection valve. Based on the parameters of the operating state of each injection valve, it can be determined whether the injection valve can operate normally or is in a failure state.
S103: and if the injection valve is in a fault state, acquiring the air-fuel ratio offset corresponding to the working condition parameter of the engine.
If the injection valve is in the failure state, the air-fuel ratio of air and fuel in the engine is changed. In order to ensure that the content of pollutant components in the exhaust gas is reduced and the conversion efficiency of the catalyst is high, an air-fuel ratio offset corresponding to an engine operating condition parameter is obtained.
It should be noted that the air-fuel ratios of the engine that need to be adjusted under different operating conditions are different, and a corresponding air-fuel ratio offset is obtained according to the engine operating condition parameters in the current operating parameters of the engine, so as to adjust the air-fuel ratios. Specifically, the engine operating condition parameters may include at least two parameters, engine speed and engine intake charge.
The air-fuel ratio offset amount may be set in advance in accordance with the conversion efficiency of the catalyst in the exhaust system. The air-fuel ratio offset amount may be a positive value or a negative value.
S104: and adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset.
And adjusting the air-fuel ratio of the engine according to the acquired air-fuel ratio offset. So can make the proportion of engine air-conditioning and gas for the gas can fully burn, reduce the formation of polluting components, and improve the conversion efficiency of catalyst converter, make the catalyst converter can be better to polluting the composition conversion.
In one possible implementation, the present embodiment provides a specific implementation manner of adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset, please refer to the following.
Based on the above-mentioned correlation of S101 to S104, it is determined whether or not the injection valve of the engine has failed based on the injection valve operation parameter, and if the injection valve has failed, the corresponding air-fuel ratio offset amount is selected according to the engine operating condition parameter, and the air-fuel ratio of the engine is adjusted. Therefore, the air-fuel ratio of the engine can be automatically adjusted based on the fault condition of the injection valve of the engine and the working condition of the engine, the content of pollution components in the waste gas discharged by the engine is less, and the requirement of emission standards is met.
In a possible implementation, before determining whether an injection valve of the engine is faulty, it is also necessary to determine that an ignition system of the engine, and other parts of the injection system than the injection valve, are operating normally.
The embodiment of the present application further provides an emission control method of an engine, in addition to the above steps, before determining whether an injection valve of the engine is in a failure state according to the injection valve operating parameter, the method further includes:
and determining that the engine meets a preset adjusting condition according to the engine working condition parameters.
The engine operating condition parameters may be used to indicate an operating state of the engine, and the engine operating condition parameters may be used to determine that the engine satisfies a predetermined adjustment condition.
The preset adjustment condition may be a preset condition that needs to be satisfied before the air-fuel ratio of the engine is adjusted. Specifically, the preset adjustment condition may be that the system other than the injection valve is operating normally. It is understood that if the system of the engine other than the injection valve is not operating normally, the injection valve may not be detected or the air-fuel ratio of the engine may not be controlled. It is necessary to make a judgment as to whether the injection valve is malfunctioning after it is determined that the engine can satisfy the preset regulation condition.
And if the engine cannot meet the preset adjustment condition according to the working condition parameters of the engine, updating the acquired engine operating parameters until the engine meets the preset adjustment condition according to the working condition parameters of the engine in the engine operating parameters.
In one possible implementation, the engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters;
the preset adjustment condition is that the engine speed is greater than or equal to a preset speed threshold, the engine intake charge is greater than or equal to a preset intake charge, and the ignition system is operating normally.
The engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters. Where engine speed refers to the speed of the engine after start-up and the engine intake charge is a parameter used to gauge engine performance and whether the intake process is complete. The ignition system operation parameter is a parameter for judging whether the ignition system is normally operated.
Correspondingly, the preset adjustment conditions are that the engine speed is greater than or equal to a preset speed threshold, the engine intake charge is greater than or equal to a preset intake charge, and the ignition system is operating normally. The preset rotating speed threshold value is the lowest rotating speed of the engine after the engine is normally started. When the engine speed is greater than or equal to the preset speed threshold, it may be indicated that the engine may be operating normally. The predetermined intake charge is the lowest intake charge at normal engine operation. When the engine intake charge is greater than or equal to the predetermined intake charge, it is indicative of normal engine intake function. The ignition system operating parameters may be used to indicate an operating condition of the ignition system, and based on the ignition system operating parameters, it may be determined whether the ignition system is operating properly.
If the engine speed is greater than or equal to the preset speed threshold, the engine intake charge is greater than or equal to the preset intake charge, and the ignition system operates normally, the engine speed, the intake charge and the ignition system are considered to be normal, preset adjustment conditions can be met, and air-fuel ratio can be further adjusted when the injection valve fails.
In the embodiment of the application, the engine is determined to meet the preset adjustment condition based on the engine working condition parameters, and the running state of the engine can be judged before the air-fuel ratio of the engine with the fault injection valve is adjusted. After determining that the engine has no other faults and can normally run, further judging whether the engine has injection valve faults or not, and adjusting the air-fuel ratio when the faults exist. Therefore, the air-fuel ratio can be adjusted more accurately aiming at the fault of the injection valve, and the emission of the engine under the fault state of the injection valve can be optimized.
It will be appreciated that the number of failed injection valves will also affect the air-fuel ratio adjustment. In a possible implementation manner, the embodiment of the application further provides an emission control method of an engine, wherein the operation parameters of the injection valve comprise the fault number of the injection valve; before the adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset amount, the method further includes:
acquiring a correction coefficient corresponding to the number of the faults of the injection valve;
and calculating the product of the air-fuel ratio offset and the correction coefficient to obtain an updated air-fuel ratio offset.
The different number of injection valves may have an influence on the fuel injected into the cylinder by the engine in the event of a malfunction. Corresponding correction factors may be preset for the number of different malfunctioning injection valves. After the correction coefficient corresponding to the number of failed injection valves is acquired, the acquired air-fuel ratio offset amount is multiplied by the correction coefficient, and the resultant product is the updated air-fuel ratio offset amount.
Based on the above, by obtaining the correction coefficient corresponding to the number of failed injection valves and calculating the updated air-fuel ratio offset value using the correction coefficient, a more accurate air-fuel ratio offset value can be obtained, and the air-fuel ratio of the engine can be adjusted more accurately.
In one possible implementation, the injection valve of the engine may also be non-malfunctioning. Correspondingly, the embodiment of the present application further provides an emission control method of an engine, which includes, in addition to the above steps, if the engine is in a normal state:
acquiring an air-fuel ratio adjustment amount corresponding to the engine working condition parameter;
and adjusting the air-fuel ratio of the engine according to the air-fuel ratio adjustment amount.
When the injection valve is not in fault, the air-fuel ratio of the engine can be dynamically adjusted according to the operation condition of the engine. Specifically, an air-fuel ratio adjustment amount corresponding to an engine operating condition parameter is obtained, wherein the air-fuel ratio adjustment amount may also be set correspondingly according to the conversion efficiency of a catalyst in an exhaust system. The air-fuel ratio adjustment amount is an amount of adjustment of the air-fuel ratio of the engine for the injection valve that is operating normally; the air-fuel ratio offset value is an amount by which the air-fuel ratio of the engine is adjusted for the failed injection valve. The air-fuel ratio adjustment amount and the air-fuel ratio offset value corresponding to the same engine operating condition parameter may be different or the same.
In the embodiment of the application, the air-fuel ratio is dynamically adjusted based on the working condition parameters of the engine when the injection valve normally operates, so that the emission of the engine can be optimized, and the emission of the engine can better meet the requirement of environmental protection.
In a possible implementation manner, the engine has an air-fuel ratio set value, and the air-fuel ratio set value needs to be adjusted according to the air-fuel ratio offset, so that the engine controls the content of the fuel gas injected by the injection valve according to the adjusted air-fuel ratio set value, and the optimization processing of the engine emission is realized.
The embodiment of the present application provides a specific implementation manner of adjusting an air-fuel ratio of the engine according to the air-fuel ratio offset amount, including:
acquiring a current air-fuel ratio set value of the engine, and adding the current air-fuel ratio set value and the air-fuel ratio offset to obtain an adjusted air-fuel ratio set value;
setting an air-fuel ratio of the engine to the adjusted air-fuel ratio setting value.
The current air-fuel ratio set value of the engine is used for representing the air-fuel ratio of the engine in the current running state, and a control system of the engine controls fuel entering a cylinder according to the current air-fuel ratio set value. The specific value of the air-fuel ratio may be related to the type of engine, the type of fuel, and the like. Specifically, a reasonable value of the air-fuel ratio is 1.
The adjusted air-fuel ratio setting value can be obtained by obtaining the current air-fuel ratio setting value of the engine and adding the obtained current air-fuel ratio setting value and the previously obtained air-fuel ratio offset. The adjusted air-fuel ratio setting value more closely conforms to the current operating state of the engine. The control system of the engine can adjust the content of the fuel entering the cylinder according to the adjusted air-fuel ratio set value, and further realize the control of the exhaust gas generated by the engine.
The embodiment of the present application does not limit the manner of obtaining the current air-fuel ratio setting value of the engine. In one possible implementation, the current air-fuel ratio set point may be obtained simultaneously with the acquisition of the operating parameters
Referring to fig. 2, a specific scenario is described below with reference to fig. 2, which is a flowchart of an emission control method of an engine according to an embodiment of the present application, where the method includes steps S201 to S208:
s201: acquiring operating parameters of an engine; the operating parameters include injection valve operating parameters and engine operating condition parameters.
Specifically, the injection valve operating parameters include injection valve fault status and injection valve fault number, and the engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters.
S202: and judging whether the engine meets a preset adjusting condition or not according to the engine working condition parameters.
If the preset adjusting condition is met, executing S203 and the subsequent steps; if the preset adjustment condition cannot be satisfied, S201 is executed again.
S203: and judging whether the injection valve of the engine is in a fault state or not according to the injection valve operation parameters.
In one possible implementation, the determination of whether an injection valve is malfunctioning may be made based on a failure status of the injection valve in the operating parameters of the injection valve.
If the injection valve is in a normal state, executing S208; if the injection valve is in the failure state, S204 is executed.
S204: and if the injection valve is in a fault state, acquiring the air-fuel ratio offset corresponding to the working condition parameter of the engine.
If the injection valve is in the fault state, the engine speed and the engine in the engine working condition parameters are utilizedIntake charge, corresponding air-fuel ratio offset lambdaB。
S205: and acquiring a correction coefficient corresponding to the fault number of the injection valve.
Obtaining a correction coefficient lambda corresponding to the number of failed injection valvesC。
S206: and calculating the product of the air-fuel ratio offset and the correction coefficient to obtain an updated air-fuel ratio offset.
Updated air-fuel ratio offset lambdaD＝λB×λC。
S207: and adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset.
By shifting the air-fuel ratio by an amount lambdaDWith the current air-fuel ratio set value lambdaAAdding to obtain the adjusted air-fuel ratio set value lambdaE，λE＝λD+λA。
S208: and acquiring an air-fuel ratio adjustment amount corresponding to the engine working condition parameter.
If the injection valve is in the normal state, the corresponding air-fuel ratio adjustment amount lambda is obtained by utilizing the engine speed and the engine intake charge in the engine working condition parametersF。
S209: and adjusting the air-fuel ratio of the engine according to the air-fuel ratio adjustment amount.
In one possible implementation, the air-fuel ratio may be adjusted by an amount λFWith the current air-fuel ratio set value lambdaAAdding to obtain the adjusted air-fuel ratio set value lambdaE，λE＝λF+λA。
Based on the method for controlling the emission of the engine provided by the embodiment of the method, the embodiment of the application also provides an emission control device of the engine, and the emission control device of the engine is described below with reference to the accompanying drawings.
Referring to fig. 3, the drawing is a schematic structural diagram of an emission control device of an engine according to an embodiment of the present application. As shown in fig. 3, the emission control device of the engine includes:
a first obtaining unit 301, configured to obtain operating parameters of an engine, where the operating parameters include an injection valve operating parameter and an engine operating condition parameter;
a determining unit 302, configured to determine whether an injection valve of the engine is in a fault state according to the injection valve operating parameter;
a second obtaining unit 303, configured to obtain an air-fuel ratio offset corresponding to the engine operating condition parameter if the injection valve is in a fault state;
a first adjusting unit 304, configured to adjust an air-fuel ratio of the engine according to the air-fuel ratio offset amount.
In one possible implementation, the apparatus further includes:
and the determining unit is used for determining that the engine meets a preset adjusting condition according to the engine working condition parameters.
In one possible implementation, the engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters;
the preset adjustment condition is that the engine speed is greater than or equal to a preset speed threshold, the engine intake charge is greater than or equal to a preset intake charge, and the ignition system is operating normally.
In one possible implementation, the apparatus further includes:
a third acquisition unit configured to acquire a correction coefficient corresponding to the number of failures of the injection valve;
and the calculation unit is used for calculating the product of the air-fuel ratio offset and the correction coefficient to obtain an updated air-fuel ratio offset.
In one possible implementation, the apparatus further includes:
the fourth acquisition unit is used for acquiring the air-fuel ratio adjustment amount corresponding to the engine working condition parameter;
and the second adjusting unit is used for adjusting the air-fuel ratio of the engine according to the air-fuel ratio adjusting amount.
In a possible implementation manner, the first adjusting unit 304 specifically includes:
acquiring a current air-fuel ratio set value of the engine, and adding the current air-fuel ratio set value and the air-fuel ratio offset to obtain an adjusted air-fuel ratio set value;
setting an air-fuel ratio of the engine to the adjusted air-fuel ratio setting value.
In one possible implementation, the air-fuel ratio offset amount is set in advance in accordance with the conversion efficiency of a catalyst in the exhaust system.
Based on the method for controlling the emission of the engine provided by the embodiment of the method, the application provides an emission control device of the engine, which comprises the following steps: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is used for storing one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of the above embodiment.
Based on the method for controlling the emission of the engine provided by the embodiment of the method, the application provides a computer-readable storage medium, wherein instructions are stored in the computer-readable storage medium, and when the instructions are executed on the terminal device, the terminal device is caused to execute the method provided by the embodiment.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system or the device disclosed by the embodiment, the description is simple because the system or the device corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An emission control method of an engine, characterized in that the method comprises:
acquiring operating parameters of an engine, wherein the operating parameters comprise operating parameters of an injection valve and working condition parameters of the engine;
judging whether an injection valve of the engine is in a fault state or not according to the injection valve operation parameters;
if the injection valve is in a fault state, acquiring air-fuel ratio offset corresponding to the working condition parameters of the engine;
and adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset.
2. The method of claim 1, wherein prior to said determining whether an injection valve of said engine is in a failed state based on said injection valve operating parameter, said method further comprises:
and determining that the engine meets a preset adjusting condition according to the engine working condition parameters.
3. The method of claim 2, wherein the engine operating condition parameters include engine speed, engine intake charge, and ignition system operating parameters;
the preset adjustment condition is that the engine speed is greater than or equal to a preset speed threshold, the engine intake charge is greater than or equal to a preset intake charge, and the ignition system is operating normally.
4. The method of claim 1, wherein the injection valve operating parameter comprises a number of injection valve failures; before the adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset amount, the method further includes:
acquiring a correction coefficient corresponding to the number of the faults of the injection valve;
and calculating the product of the air-fuel ratio offset and the correction coefficient to obtain an updated air-fuel ratio offset.
5. The method of claim 1, wherein if the engine is in a normal state, the method further comprises:
acquiring an air-fuel ratio adjustment amount corresponding to the engine working condition parameter;
and adjusting the air-fuel ratio of the engine according to the air-fuel ratio adjustment amount.
6. The method according to any one of claims 1-5, wherein said adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset amount comprises:
acquiring a current air-fuel ratio set value of the engine, and adding the current air-fuel ratio set value and the air-fuel ratio offset to obtain an adjusted air-fuel ratio set value;
setting an air-fuel ratio of the engine to the adjusted air-fuel ratio setting value.
7. The method according to any one of claims 1 to 5, characterized in that the air-fuel ratio offset amount is set in advance in accordance with a conversion efficiency of a catalyst in an exhaust system.
8. An emission control device of an engine, characterized in that the device comprises:
the system comprises a first acquisition unit, a second acquisition unit and a control unit, wherein the first acquisition unit is used for acquiring the operation parameters of the engine, and the operation parameters comprise the operation parameters of an injection valve and the working condition parameters of the engine;
the judging unit is used for judging whether an injection valve of the engine is in a fault state or not according to the injection valve operation parameters;
the second acquisition unit is used for acquiring air-fuel ratio offset corresponding to the working condition parameters of the engine if the injection valve is in a fault state;
and the first adjusting unit is used for adjusting the air-fuel ratio of the engine according to the air-fuel ratio offset.
9. An emission control apparatus of an engine, characterized by comprising: a processor, a memory, a system bus;
the processor and the memory are connected through the system bus;
the memory is to store one or more programs, the one or more programs comprising instructions, which when executed by the processor, cause the processor to perform the method of any of claims 1-7.
10. A computer-readable storage medium having stored therein instructions that, when executed on a terminal device, cause the terminal device to perform the method of any one of claims 1-7.
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| CN112963252B (en) | 2022-08-23 |
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