CN114961992B - Vehicle fault simulation method, storage medium and vehicle - Google Patents
Vehicle fault simulation method, storage medium and vehicle Download PDFInfo
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- CN114961992B CN114961992B CN202110833219.XA CN202110833219A CN114961992B CN 114961992 B CN114961992 B CN 114961992B CN 202110833219 A CN202110833219 A CN 202110833219A CN 114961992 B CN114961992 B CN 114961992B
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- 238000004088 simulation Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 29
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 26
- 229910052760 oxygen Inorganic materials 0.000 claims description 26
- 239000001301 oxygen Substances 0.000 claims description 26
- 238000011217 control strategy Methods 0.000 claims description 22
- 230000003111 delayed effect Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000012827 research and development Methods 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/085—Safety, indicating, or supervising devices with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame
- F02B77/086—Sensor arrangements in the exhaust, e.g. for temperature, misfire, air/fuel ratio, oxygen sensors
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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
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present disclosure relates to a vehicle fault simulation method, a storage medium and a vehicle, and relates to the technical field of vehicles. Thus, the use of a misfire fault simulator is no longer necessary when performing OBD system fault parameter calibration. The vehicle research and development cost can be reduced to a certain extent, and the wiring harness arrangement and the placement position of the fire fault simulator do not need to be considered when the fire fault simulation is carried out, so that the working efficiency can be greatly improved.
Description
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a vehicle fault simulation method, a storage medium and a vehicle.
Background
The OBD (On Board Diagnostics, on-board diagnostic system) is used to monitor the emission control system of the vehicle, and when an emission-related component fails, the OBD system should detect the failure, store the corresponding failure code in the ECU (Electronic Control Unit ), and illuminate the failure indicator. Therefore, when performing OBD calibration, a corresponding fault needs to be loaded to calibrate the limit value of the corresponding fault. For example, a misfire simulation is performed on the engine to obtain a limit value of the misfire fault.
In the related art, when the OBD calibration is performed, a fault simulator is generally used to trigger the vehicle to generate a corresponding fault. However, when a wire harness is connected to some fault simulators, a wire breaking box is needed, so that the rotating drum calibration and three-high experiment are inconvenient, and the single power supply is needed for some fault simulators, so that the size and the weight are large, and the number of the wire harnesses is large when the real vehicle is arranged. In addition, the price of the fault simulator is high, and when the research and development projects of the vehicle are more, a plurality of fault simulators are required to be configured to meet the requirements, so that the cost is high.
Disclosure of Invention
An object of the present disclosure is to provide a vehicle failure simulation method, a storage medium, and a vehicle to solve the above technical problems in whole or in part.
According to a first aspect of embodiments of the present disclosure, there is provided a vehicle fault simulation method applied to an electronic control unit of a vehicle, the method including:
Determining a misfire pattern of an engine and a misfire parameter in the misfire pattern;
And according to the fire parameters, controlling the engine to perform fire simulation in combination with a fire control strategy corresponding to the fire mode.
In some embodiments, the misfire pattern is any one of a single cylinder single misfire pattern, a single cylinder sequential misfire pattern, and a multiple misfire pattern.
In some embodiments, where the misfire pattern is the single cylinder single misfire pattern, determining the misfire parameter in the misfire pattern includes:
determining a first number of misfires, a first interval of misfires, and a type of misfires in the single-cylinder single-misfire pattern, wherein the first number of misfires represents a total number of misfires of the engine, and the first interval of misfires represents a number of times the engine is normally ignited between each two misfires;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
Determining a misfired cylinder when the engine is in each misfire according to the first number of misfires and the first misfire interval; and
And aiming at the fire cylinder when the engine fires each time, controlling the fire cylinder to perform fire fault simulation according to the fire type, and controlling the normal ignition times of the engine to reach the first fire interval after the fire cylinder fires.
In some embodiments, where the misfire pattern is the single cylinder continuous misfire pattern, determining the misfire parameter in the misfire pattern includes:
determining a second number of misfires, a second interval of misfires, and a type of misfires in the single cylinder continuous misfire pattern, wherein the second number of misfires characterizes a number of continuous misfires for each cylinder of the engine, and the second interval of misfires characterizes a number of normal ignitions for all cylinders between a cylinder misfire and a next cylinder misfire;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
determining a misfired cylinder when the engine is in each misfire according to the second number of misfires and the second misfire interval;
and aiming at the fire cylinder when the engine fires each time, controlling the fire cylinder to fire according to the fire type, and controlling the normal ignition times of all cylinders of the engine to reach the second fire interval under the condition that the fire times of the fire cylinder reach the second fire times.
In some embodiments, where the misfire pattern is the multiple misfire pattern, determining the misfire parameter in the misfire pattern includes:
determining a misfire cylinder number and a misfire type in the multiple misfire pattern;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
And controlling the cylinder corresponding to the fire cylinder number to perform fire simulation according to the fire type.
In some embodiments, the misfire types include a no-oil misfire type and/or a no-ignition misfire type.
In some embodiments, the determining the misfire pattern of the engine and the misfire parameter in the misfire pattern includes:
acquiring a fire parameter corresponding to each fire mode under the condition that the plurality of fire modes of the engine are determined;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
determining a priority corresponding to each of the plurality of misfire patterns;
And according to the sequence of the priorities corresponding to the multiple fire modes, executing the fire parameters corresponding to the fire modes according to each fire mode, and controlling the engine to perform fire simulation by combining the fire control strategy corresponding to the fire mode.
In some embodiments, the method further comprises:
Acquiring a signal of an oxygen sensor;
Taking the signal of the oxygen sensor as the input of a delayer to obtain a delayed signal;
Taking the delayed signal as the input of a filter to obtain a filtered signal;
And controlling the vehicle to perform oxygen sensor fault simulation according to the filtered signal.
According to a second aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the first aspect of the present disclosure.
According to a third aspect of embodiments of the present disclosure, there is provided a vehicle comprising:
A memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method of the first aspect of the disclosure.
According to the technical scheme, the electronic control unit controls the engine to perform fire simulation according to the selected fire mode and the corresponding fire parameters. The use of a misfire fault simulator is no longer necessary when performing OBD system fault parameter calibration. The vehicle research and development cost can be reduced to a certain extent, and the wiring harness arrangement and the placement position of the fire fault simulator do not need to be considered when the fire fault simulation is carried out, so that the working efficiency can be greatly improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a vehicle fault simulation method according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating a single cylinder single misfire pattern control engine misfire simulation according to an exemplary embodiment;
FIG. 3 is a flowchart illustrating a single cylinder continuous misfire pattern control engine misfire simulation according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating multiple misfire patterns controlling an engine to perform a misfire simulation according to an exemplary embodiment;
FIG. 5 is a flow chart illustrating a method of oxygen sensor fault simulation according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
FIG. 1 is a flow chart illustrating a vehicle fault simulation method according to an exemplary embodiment. As shown in fig. 1, the vehicle fault simulation method is applied to an electronic control unit of a vehicle, and includes the following steps.
In step 110, a misfire pattern of the engine and a misfire parameter in the misfire pattern are determined.
Here, the misfire pattern of the engine may be set according to parameters that the OBD system needs to calibrate. In some embodiments, the misfire pattern of the engine is any one of a single cylinder single misfire pattern, a single cylinder sequential misfire pattern, and a multiple misfire pattern. The single-cylinder single-fire mode refers to that each cylinder of the engine fires once in turn, the single-cylinder continuous fire mode refers to that each cylinder of the engine fires continuously for a plurality of times, and the multiple fire mode refers to that a plurality of cylinders of the engine fire simultaneously.
It is worth noting that for different misfire patterns, a numerical representation may be used. For example, the number "1" indicates a single-cylinder single-fire mode, the number "2" indicates a single-cylinder continuous-fire mode, and the number "3" indicates a multiple-fire mode.
In some embodiments, the misfire parameters may include at least one of a number of misfires, a misfire interval, a misfire cylinder number, and a misfire type. It should be appreciated that the misfire parameters that need to be set for each misfire pattern may or may not be the same.
In step 120, according to the misfire parameter, the engine is controlled to perform a misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern.
Here, each of the misfire patterns corresponds to one of the misfire control strategies, and when the misfire pattern and the misfire parameter under the misfire pattern are determined, the electronic control unit controls the cylinder of the engine to misfire according to the misfire parameter and the misfire control strategy corresponding to the misfire pattern, so as to perform the misfire simulation corresponding to the misfire pattern, and obtain the calibration parameters of the OBD system under different misfire conditions. For example, if the single-cylinder single-fire mode is selected, the fire parameters in the single-cylinder single-fire mode are further set, and then the electronic control unit controls the engine to perform fire simulation according to the fire parameters corresponding to the single-cylinder single-fire mode and in combination with the control strategy of the single-cylinder single-fire mode.
It should be noted that, when the electronic control unit controls the engine to perform the misfire simulation, the fuel injection and/or the ignition state of each cylinder can be calculated through control, and then a state request is sent out and output to the fuel injector controller and/or the ignition coil controller so as to control the ignition or the misfire of the corresponding cylinder.
Thus, the electronic control unit controls the engine to perform the fire simulation according to the selected fire mode and the corresponding fire parameters. The use of a misfire fault simulator is no longer necessary when performing OBD system fault parameter calibration. The vehicle research and development cost can be reduced to a certain extent, and the wiring harness arrangement and the placement position of the fire fault simulator do not need to be considered when the fire fault simulation is carried out, so that the working efficiency can be greatly improved.
FIG. 2 is a flow chart illustrating a single cylinder single misfire pattern control engine misfire simulation according to an exemplary embodiment. In some possible embodiments, as shown in fig. 2, when the determined misfire pattern is a single cylinder single misfire pattern, the engine is controlled to perform the misfire simulation by the following steps.
In step 220, a first number of misfires, a first interval of misfires, and a type of misfire in the single cylinder single misfire pattern is determined, wherein the first number of misfires characterizes a total number of misfires of the engine, and the first interval of misfires characterizes a number of normal ignitions of the engine between each two misfires.
Here, the first number of misfires of the single cylinder single misfire pattern characterizes a total number of misfires occurring in the engine. For example, if the first number of misfires is set to 5, the engine is controlled to simulate 5 misfires in total, and after reaching 5 misfires no longer progress. The first misfire interval refers to the number of times the engine fires normally between every two misfires, for example, the first misfire interval is set to 19 times, after the engine fires 1 st, the engine fires normally 19 times, and the engine fires 2 nd. At this time, the misfire rate=1/(1+second misfire interval) =5%. The misfire types include a non-fuel-injection misfire type and/or a non-ignition misfire type, wherein the non-fuel-injection misfire type refers to a misfire caused by a non-fuel injection of a cylinder of an engine, and the non-ignition misfire type refers to a misfire caused by a non-fuel injection of the cylinder of the engine.
In step 240, a misfired cylinder for each misfire of the engine is determined based on the first number of misfires and the first misfire interval.
Here, the misfiring cylinder refers to a cylinder that needs to perform a misfire, and for example, if the misfiring cylinder is a cylinder No. 3 in a 4-cylinder engine, cylinders No. 1,2, and 4 are normally ignited, and cylinder No. 3 is misfiring. In some embodiments, the misfired cylinder at each misfire may be calculated in combination with Misf Gen functions based on the first number of misfires and the first misfire interval. The specific principle is that the current cylinder is calculated according to the cylinder which is in the last fire, the fire interval and the current fire times. Taking a 4-cylinder engine as an example, the ignition sequence is as follows: 1-3-4-2, so that in the single-cylinder single-fire mode, the 1 st fire is the 1 st cylinder, the 2 nd fire is the 3 rd cylinder according to the last fire cylinder, the fire interval and the current fire times, the 3 rd fire is the 4 th cylinder, the 4 th fire is the 2 nd cylinder, the 5 th fire is the 1 st cylinder, and the cycle is performed in turn.
In step 260, for each of the cylinders that the engine is in a misfire, the cylinders are controlled to perform a misfire fault simulation according to the type of the misfire, and after the cylinders are in a misfire, the number of normal ignitions of the engine is controlled to reach the first misfire interval.
Here, for each calculated misfire cylinder, the electronic control unit controls the misfire cylinder according to the set misfire type to perform a misfire fault simulation, and controls the number of times of normal ignition of all cylinders of the engine to reach the first misfire interval after the misfire of the misfire cylinder occurs. Taking a 4-cylinder engine as an example, the first number of fires is 3 times, the first fire interval is 19 times, when the calculated fire cylinder is the 1 st cylinder, the 1 st cylinder is controlled to fire according to the fire type, meanwhile, the 2 nd, 3rd and 4 th cylinders are normally ignited, then the 1 st, 2 nd, 3rd and 4 th cylinders are normally ignited 19 times, after the 19 th normal ignition, if the 2 nd fire cylinder is the 3rd cylinder, the 3rd cylinder is controlled to fire according to the fire type, meanwhile, the 1 st, 2 nd and 4 th cylinders are normally ignited, then the 1 st, 2 nd, 3rd and 4 th cylinders are normally ignited 19 times, after the 19 th normal ignition, if the 3rd fire cylinder is the 2 nd cylinder, the 2 nd cylinder is controlled to fire according to the fire type, meanwhile, the 1 nd, 3 nd and 4 th cylinders are normally ignited, the total number of times of the engine reaches the first number of times, and the simulation of the fire is ended.
FIG. 3 is a flowchart illustrating a single cylinder continuous misfire pattern control engine misfire simulation according to an exemplary embodiment. In some possible embodiments, as shown in FIG. 3, when the determined misfire pattern is a single cylinder continuous misfire pattern, the engine is controlled to perform a misfire simulation by the following steps.
In step 320, a second number of misfires, a second interval of misfires, and a type of misfire in the single cylinder continuous misfire pattern is determined, wherein the second number of misfires characterizes a number of continuous misfires per cylinder of the engine, and the second interval of misfires characterizes a number of normal firings of all cylinders between a cylinder misfire and a next cylinder misfire.
Here, the second misfire count refers to the number of consecutive misfires per cylinder of the engine, and the second misfire interval refers to the number of normal ignitions of all cylinders between the misfire of one cylinder and the misfire of the next cylinder.
In step 340, a misfired cylinder for each misfire of the engine is determined based on the second number of misfires and the second misfire interval.
Here, the misfiring cylinder refers to a cylinder that needs to perform a misfire, and for example, if the misfiring cylinder is a cylinder No. 3 in a 4-cylinder engine, cylinders No. 1,2, and 4 are normally ignited, and cylinder No. 3 is misfiring. In some embodiments, the misfired cylinder at each misfire may be calculated in combination with Misf Gen functions based on the second number of misfires and the second misfire interval. The specific principle is that the current cylinder is calculated according to the cylinder which is in the last fire, the fire interval and the current fire times. Taking a 4-cylinder engine as an example, the ignition sequence is as follows: 1-3-4-2, so that in the single-cylinder single-fire mode, the 1 st fire is the 1 st fire, the 2 nd fire is the 3 rd fire according to the last fire, the fire interval and the current fire times, the 3 rd fire is the 4 th fire, and the 4 th fire is the 2 nd fire.
In step 360, for each of the cylinders that the engine is in fire, the cylinder is controlled to fire according to the type of fire, and if the number of fires of the cylinder reaches the second number of fires, the number of normal fires of all cylinders of the engine is controlled to reach the second interval of fires.
Here, for each calculated misfire cylinder, the electronic control unit controls the misfire cylinder to continuously misfire according to the set type of misfire, and in the case where the number of times of misfire of the misfire cylinder reaches the second number of times of misfire, controls the number of times of normal ignition of all cylinders of the engine to reach the second misfire interval.
Taking a 4-cylinder engine as an example, the ignition sequence is as follows: 1-3-4-2, if the second number of misfires is set to 10 and the second misfire interval is set to 20, then the cylinder No. 1 is continuously misfired 10 times while the cylinders No. 2,3 and 4 are normally fired 10 times, then the cylinder No. 1,2, 3 and 4 are normally fired 20 times, then the cylinder No. 3 is continuously misfired 10 times while the cylinders No. 1,2 and 4 are normally fired 10 times, then the cylinder No. 1,2, 3 and 4 are normally fired 20 times, then the cylinder No. 4 is continuously fired 10 times while the cylinders No. 1,2 and 3 are normally fired 10 times, then the cylinder No. 1,2, 3 and 4 are normally fired 20 times, then the cylinder No. 2 is continuously fired 10 times while the cylinder No. 1,2 and 4 are normally fired 10 times, finally the cylinder No. 1,2, 3 and 4 are normally fired 20 times, and the fault simulation of the single cylinder continuous fire mode is ended.
FIG. 4 is a flow chart illustrating multiple misfire patterns controlling an engine to perform a misfire simulation according to an exemplary embodiment. In some possible embodiments, as shown in fig. 4, when the determined misfire pattern is a multiple misfire pattern, the engine is controlled to perform the misfire simulation by the following steps.
In step 420, a misfire cylinder number and a misfire type in the multiple misfire pattern are determined.
Here, the multiple misfire pattern means that a plurality of cylinders are simultaneously misfired, and therefore, after the multiple misfire pattern is determined, it is necessary to further set the misfire cylinder numbers and the misfire types corresponding to the respective misfire cylinder numbers.
In some embodiments, the different data bits each represent a cylinder number of a cylinder of an engine. Taking a 4-cylinder engine as an example, data bit "0" represents cylinder number 1, data bit "1" represents cylinder number 3, data bit "2" represents cylinder number 4, and data bit "3" represents cylinder number 2. The cylinder that needs to be misfiring may be selected by setting a value on the data bit. For example, the value "0" indicates a cylinder that does not require a misfire, and the value "1" indicates a cylinder that does require a misfire. If the cylinders 1 and 3 are required to be set for misfire, the data bit 0 and the data bit 1 are both set to 1, and the data bit 2 and the data bit 3 are set to 0.
In step 440, the cylinder corresponding to the misfire cylinder number is controlled to perform the misfire simulation according to the misfire type.
Here, when performing the misfire simulation of the multiple misfire pattern, the electronic control unit controls the cylinder corresponding to the misfire cylinder number to misfire according to the corresponding misfire type according to the misfire cylinder number and the misfire type.
It is noted that the number of misfires and the misfire interval may also be set for each of the misfired cylinders in the multiple misfire pattern.
In some implementations that may be implemented, determining a misfire pattern of the engine and a misfire parameter in the misfire pattern in step 110 includes:
acquiring a fire parameter corresponding to each fire mode under the condition that the plurality of fire modes of the engine are determined;
in step 120, according to the misfire parameter, in combination with a misfire control strategy corresponding to the misfire pattern, controlling the engine to perform a misfire simulation may include:
determining a priority corresponding to each of the plurality of misfire patterns;
And according to the sequence of the priorities corresponding to the multiple fire modes, executing the fire parameters corresponding to the fire modes according to each fire mode, and controlling the engine to perform fire simulation by combining the fire control strategy corresponding to the fire mode.
Here, if it is determined that the engine needs to simulate a plurality of misfire patterns, it is necessary to further determine the priority corresponding to each of the misfire patterns. Then, according to the priority sequence of the multiple fire modes, the fire parameters corresponding to each fire mode are sequentially aimed, and the fire simulation is controlled to be carried out on the engine by combining the fire control strategy corresponding to the fire mode, so that logic confusion caused when the user sets the multiple fire modes simultaneously is avoided.
For example, the priority of the misfire pattern is: single-cylinder single fire mode > single-cylinder continuous fire mode > multiple fire mode. The electronic control unit controls the engine to perform fire simulation according to the fire parameters of the single-cylinder single-fire mode and the corresponding fire control strategies, then controls the engine to perform fire simulation according to the fire parameters of the single-cylinder continuous-fire mode and the corresponding fire control strategies, and finally controls the engine to perform fire simulation according to the fire parameters of the multiple-fire mode and the corresponding fire control strategies.
FIG. 5 is a flow chart illustrating a method of oxygen sensor fault simulation according to an exemplary embodiment. As shown in fig. 5, there is provided an oxygen sensor fault simulation method including the following steps.
In step 510, a signal of an oxygen sensor is acquired.
Here, the oxygen sensor may be a linear oxygen sensor or a two-point oxygen sensor. In some embodiments, the electronic control unit may preprocess the received signal of the oxygen sensor according to preset calibration parameters to correct the signal of the oxygen sensor.
In step 520, the signal of the oxygen sensor is used as an input of a delayer, and a delayed signal is obtained.
Here, a delay device is provided in the electronic control unit, and after the electronic control unit receives the signal of the oxygen sensor, the signal of the oxygen sensor is input into the delay device to perform delay processing on the signal of the oxygen sensor.
It is worth to say that the delay time of the delayer can be set according to the fault degree simulated by actual needs, and the delayer delays the signal of the oxygen sensor according to the set delay time.
In step 530, the delayed signal is used as an input to a filter to obtain a filtered signal.
Here, the delayed signal is input to a filter, so that the filter performs filtering processing on the delayed signal to obtain a filtered signal.
It is worth to say that the filter coefficient of the filter can be set according to the fault degree simulated by actual needs, and the filter carries out filtering processing on the delayed signals according to the set filter coefficient.
In step 540, the vehicle is controlled to perform oxygen sensor fault simulation according to the filtered signal.
Here, the filtered signal may be input into other functional modules of the vehicle to perform oxygen sensor fault simulation. For example, the filtered signal is input into an air-fuel ratio closed loop control system or an oxygen sensor diagnostic system. It should be understood that the filtered signal may be subjected to clipping processing to obtain a clipped signal, and the clipped signal may be input to other functional modules for oxygen sensor fault simulation.
Thus, the signal of the oxygen sensor is processed through the delay device and the filter, so that a fault mode that the signal response of the oxygen sensor is slow and/or the signal response is delayed can be simulated.
In another exemplary embodiment, there is also provided a vehicle including:
A memory having a computer program stored thereon;
A processor for executing the computer program in the memory, with the steps of the vehicle fault simulation method according to the above embodiment.
In another exemplary embodiment, a computer readable storage medium is also provided that includes program instructions that, when executed by a processor, implement the steps of the vehicle fault simulation method described above.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (8)
1. A vehicle fault simulation method, characterized by being applied to an electronic control unit of a vehicle, the method comprising:
Determining a misfire pattern of an engine and a misfire parameter in the misfire pattern;
According to the fire parameters, controlling the engine to perform fire simulation by combining a fire control strategy corresponding to the fire mode;
The fire mode is any one of a single-cylinder single fire mode, a single-cylinder continuous fire mode and a multiple fire mode;
In the case where the misfire pattern is the single-cylinder single-shot misfire pattern, determining the misfire parameter in the misfire pattern includes:
determining a first number of misfires, a first interval of misfires, and a type of misfires in the single-cylinder single-misfire pattern, wherein the first number of misfires represents a total number of misfires of the engine, and the first interval of misfires represents a number of times the engine is normally ignited between each two misfires;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
Determining a misfired cylinder when the engine is in each misfire according to the first number of misfires and the first misfire interval; and
And aiming at the fire cylinder when the engine fires each time, controlling the fire cylinder to perform fire fault simulation according to the fire type, and controlling the normal ignition times of the engine to reach the first fire interval after the fire cylinder fires.
2. The vehicle fault simulation method according to claim 1, wherein, in the case where the misfire pattern is the single cylinder continuous misfire pattern, determining a misfire parameter in the misfire pattern includes:
determining a second number of misfires, a second interval of misfires, and a type of misfires in the single cylinder continuous misfire pattern, wherein the second number of misfires characterizes a number of continuous misfires for each cylinder of the engine, and the second interval of misfires characterizes a number of normal ignitions for all cylinders between a cylinder misfire and a next cylinder misfire;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
determining a misfired cylinder when the engine is in each misfire according to the second number of misfires and the second misfire interval;
and aiming at the fire cylinder when the engine fires each time, controlling the fire cylinder to fire according to the fire type, and controlling the normal ignition times of all cylinders of the engine to reach the second fire interval under the condition that the fire times of the fire cylinder reach the second fire times.
3. The vehicle fault simulation method according to claim 1, wherein, in the case where the misfire pattern is the multiple misfire pattern, determining a misfire parameter in the misfire pattern includes:
determining a misfire cylinder number and a misfire type in the multiple misfire pattern;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
And controlling the cylinder corresponding to the fire cylinder number to perform fire simulation according to the fire type.
4. A vehicle failure simulation method according to any one of claims 1 to 3, characterized in that the misfire type includes a non-injection misfire type and/or a non-ignition misfire type.
5. The vehicle fault simulation method according to claim 1, wherein the determining the misfire pattern of the engine and the misfire parameter in the misfire pattern includes:
acquiring a fire parameter corresponding to each fire mode under the condition that the plurality of fire modes of the engine are determined;
and according to the misfire parameter, controlling the engine to perform misfire simulation in combination with a misfire control strategy corresponding to the misfire pattern, including:
determining a priority corresponding to each of the plurality of misfire patterns;
And according to the sequence of the priorities corresponding to the multiple fire modes, executing the fire parameters corresponding to the fire modes according to each fire mode, and controlling the engine to perform fire simulation by combining the fire control strategy corresponding to the fire mode.
6. The vehicle fault simulation method according to claim 1, characterized in that the method further comprises:
Acquiring a signal of an oxygen sensor;
Taking the signal of the oxygen sensor as the input of a delayer to obtain a delayed signal;
Taking the delayed signal as the input of a filter to obtain a filtered signal;
And controlling the vehicle to perform oxygen sensor fault simulation according to the filtered signal.
7. A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that the program, when executed by a processor, implements the vehicle fault simulation method of any of claims 1-6.
8. A vehicle, characterized by comprising:
A memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the vehicle fault simulation method of any one of claims 1-6.
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| JP2017155605A (en) * | 2016-02-29 | 2017-09-07 | トヨタ自動車株式会社 | Misfire detection device for multi-cylinder internal combustion engine |
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| KR19990059908A (en) * | 1997-12-31 | 1999-07-26 | 정몽규 | Engine misfire detection device and method |
| CN101271042A (en) * | 2008-04-11 | 2008-09-24 | 湖北天运汽车电控系统有限公司 | Software miss-fire generator |
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