CN113864073B - Control method and system for oxygen sensor diagnosis of extended range hybrid electric vehicle - Google Patents
Control method and system for oxygen sensor diagnosis of extended range hybrid electric vehicle Download PDFInfo
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 48
- 239000001301 oxygen Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000003745 diagnosis Methods 0.000 title claims description 39
- 239000010705 motor oil Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 230000002045 lasting effect Effects 0.000 claims description 4
- 239000000446 fuel Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000779 smoke 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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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
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
- F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/18—Control of the engine output torque
- F02D2250/24—Control of the engine output torque by using an external load, e.g. a generator
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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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a control method and a system for diagnosing an oxygen sensor of a range-extending hybrid electric vehicle, which are based on road condition information provided by map navigation and accumulated driving mileage of the vehicle.
Description
Technical Field
The invention belongs to the field of automobile control, and particularly relates to a control method and a system for diagnosing an oxygen sensor of an extended-range hybrid electric vehicle.
Background
The automobile oxygen sensor is a key part for controlling automobile exhaust emission, reducing the environmental pollution of automobiles and improving the fuel combustion quality of automobile engines. When the front oxygen sensor fails, the engine controller cannot obtain information of oxygen concentration in the exhaust pipe, so that feedback control cannot be performed on the air-fuel ratio, the fuel consumption and exhaust pollution of the engine can be increased, and the engine has the failure phenomena of unstable idling, unfinished fire and the like; once the rear oxygen sensor fails, whether the three-way catalyst fails or not can not be timely identified, and the whole vehicle can be subjected to the failure phenomena of increased emission pollution, black smoke emission and the like.
The engine of the extended range hybrid electric vehicle is not directly driven, and the engine controller cannot perform oxygen sensor diagnosis (because the oxygen sensor diagnosis can be performed only under the reverse driving condition of the engine) due to the lack of the reverse driving condition of the engine; therefore, it is necessary to design a control method and system for oxygen sensor diagnosis of an extended-range hybrid vehicle.
Disclosure of Invention
The invention aims to provide a control method and a control system for diagnosing an oxygen sensor of an extended-range hybrid electric vehicle so as to form a reverse towing condition of an engine and facilitate the diagnosis of the oxygen sensor by an engine controller.
The invention relates to a control method for diagnosing an oxygen sensor of a range-extending type hybrid electric vehicle, which comprises the following steps:
s1, road condition information, accumulated driving mileage, oxygen sensor diagnosis state, engine speed, generator actual speed, vehicle speed and accelerator pedal opening are obtained, and then S2 is executed.
S2, judging whether the oxygen sensor diagnosis triggering condition is met, if so, executing S3, otherwise, ending.
S3, determining a generator rotating speed threshold value n according to the vehicle speed, sequentially sending i rotating speed values I to a generator controller as generator rotating speed request values according to the sequence from small to large, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold value to the engine controller as an engine torque request value, and then executing S4. Wherein the j-th rotation speed value in 1j The method meets the following conditions:
representing the dividing gradient of the rotating speed threshold value, wherein j is more than or equal to 1 and less than or equal to i.
S4, judging whether the actual rotation speed of the generator reaches a generator rotation speed threshold value n, if so, executing S5, otherwise, continuing executing S4.
S5, sending a generator rotating speed threshold value n as a generator rotating speed request value to a generator controller, sending an engine oil injection request to the engine controller, sending 0 as an engine torque request value to the engine controller, and continuously for a preset first time, and then executing S6.
And S6, sending a generator rotating speed threshold value n as a generator rotating speed request value to a generator controller, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold value as an engine torque request value to the engine controller, enabling the generator to rotate at the generator rotating speed threshold value n and drag the engine to operate, forming a reverse dragging working condition of the engine, lasting for a second time, and then executing S7. The engine controller may complete the oxygen sensor diagnostic within the second time.
And S7, judging whether the opening degree of the accelerator pedal is larger than 0, if so, executing S8, otherwise, executing S9.
S8, determining a generator rotating speed request value and an engine torque request value according to the driver demand, sending the generator rotating speed request value (namely, the generator rotating speed request value determined according to the driver demand) to a generator controller, sending the engine torque request value (namely, the engine torque request value determined according to the driver demand) and an engine oil injection request to the engine controller so as to enable the engine to normally generate electricity, and ending.
And S9, sequentially sending i rotating speed values II to the generator controller as generator rotating speed request values according to the sequence from large to small, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold value to the engine controller as an engine torque request value, stopping the engine, and ending. Wherein the kth rotational speed value IIn 2k The method meets the following conditions:
1≤k≤i。
preferably, if the condition 1a or the condition 1b is satisfied, it indicates that the oxygen sensor diagnosis trigger condition is satisfied.
Condition 1a is: when the road condition information is a high-speed road condition, dividing the accumulated driving mileage by a preset first mileage threshold value to be an integer, wherein the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine speed and the actual speed of the generator are equal to 0.
Condition 1b is: when the road condition information is non-high-speed road conditions, dividing the accumulated driving mileage by a preset second mileage threshold value to be an integer, wherein the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine speed and the actual speed of the generator are equal to 0.
The preset first mileage threshold value is larger than the preset second mileage threshold value.
Preferably, the method for determining the generator rotation speed threshold n according to the vehicle speed is as follows: inquiring a preset rotating speed threshold value table according to the vehicle speed to obtain a rotating speed threshold value n of the generator; the preset rotation speed threshold value table is a corresponding relation table of the vehicle speed and the rotation speed threshold value of the generator, which is obtained in a calibration mode, and the larger the vehicle speed is, the larger the rotation speed threshold value of the generator is.
The second time is determined according to the vehicle speed, and the specific mode is as follows: inquiring a preset time table according to the vehicle speed to obtain the second time; the preset timetable is a corresponding relation table of the vehicle speed and the second time, which is obtained through a calibration mode, and the second time is shorter as the vehicle speed is higher.
The control system for diagnosing the oxygen sensor of the extended-range hybrid electric vehicle comprises a whole vehicle controller, wherein the whole vehicle controller is programmed so as to execute the control method.
The invention can periodically start the engine based on the road condition information provided by map navigation and the accumulated driving mileage of the vehicle to form the reverse-towing working condition of the engine, thereby facilitating the diagnosis of the oxygen sensor by the engine controller; the engine controller can diagnose the fault of the oxygen sensor in time so as to maintain in time, and reduce the phenomena of unstable idling and increased oil consumption and emission.
Drawings
FIG. 1 is a schematic diagram showing the control interaction of the oxygen sensor diagnosis of the extended-range hybrid vehicle according to the present embodiment.
Fig. 2 is a timing chart showing the execution of engine stop after the completion of the diagnosis of the oxygen sensor in the present embodiment.
Fig. 3 is a timing chart showing the normal power generation of the engine after the diagnosis of the oxygen sensor is completed in this embodiment.
Fig. 4 is a control flow chart of the oxygen sensor diagnosis of the extended-range hybrid vehicle in the present embodiment.
Detailed Description
As shown in fig. 1, the control system for diagnosing the oxygen sensor of the extended-range hybrid electric vehicle in the embodiment comprises a whole vehicle controller, wherein the whole vehicle controller interacts with an instrument IP, a map navigation controller, an engine controller, a generator controller and the like through a CAN bus. The vehicle controller CAN acquire the accumulated driving mileage calculated by the instrument IP, CAN acquire road condition information (high-speed road condition and non-high-speed road condition) provided by the map navigation controller, CAN acquire the diagnosis state of the oxygen sensor and the engine rotating speed provided by the engine controller, CAN acquire the actual rotating speed of the generator provided by the generator controller, and CAN acquire the vehicle speed and the accelerator pedal opening from the CAN bus. The vehicle controller is programmed to execute the control method described below.
As shown in fig. 2 to 4, the control method of the oxygen sensor diagnosis of the extended-range hybrid vehicle in the present embodiment is executed by the vehicle controller, and includes:
s1, road condition information, accumulated driving mileage, oxygen sensor diagnosis state, engine speed, generator actual speed, vehicle speed and accelerator pedal opening are obtained, and then S2 is executed.
S2, judging whether the oxygen sensor diagnosis triggering condition is met, if so, executing S3, otherwise, ending.
If the condition 1a or the condition 1b is satisfied, it indicates that the oxygen sensor diagnostic trigger condition is satisfied (corresponding to the oxygen sensor diagnostic trigger condition of 1 in fig. 2 and 3).
Condition 1a is: when the road condition information is a high-speed road condition, the accumulated driving mileage is divided by a preset first mileage threshold (for example, 1000 m) to be an integer, the diagnosis state of the oxygen sensor indicates that diagnosis is needed (namely, the diagnosis state of the oxygen sensor is 1), and the engine speed and the actual speed of the generator are equal to 0.
Condition 1b is: when the road condition information is a non-high-speed road condition, the accumulated driving mileage is divided by a preset second mileage threshold (for example, 500 m) to be an integer, the diagnosis state of the oxygen sensor indicates that diagnosis is required (namely, the diagnosis state of the oxygen sensor is 1), and the engine speed and the actual speed of the generator are equal to 0. The preset first mileage threshold value is larger than the preset second mileage threshold value.
S3, inquiring a preset rotating speed threshold value table according to the vehicle speed to obtain a generator rotating speed threshold value n, sequentially sending i rotating speed values I to a generator controller as generator rotating speed request values according to the sequence from small to large, sending an engine oil-cutting request (corresponding to the engine oil-cutting request 1 in the figures 2 and 3) to the engine controller, sending a preset engine torque threshold value to the engine controller as an engine torque request value, and then executing S4; wherein the j-th rotation speed value in 1j The method meets the following conditions:
the method is characterized in that a rotational speed threshold dividing gradient is represented, j is more than or equal to 1 and less than or equal to i, a preset rotational speed threshold table is a corresponding relation table of the speed of the vehicle and the rotational speed threshold of the generator, which is obtained in a calibration mode, and the larger the speed is, the larger the rotational speed threshold of the generator is. In the embodiment, the generator rotation speed threshold value N obtained by table lookup is 1500rpm, and the preset engine torque threshold value is-30 N.m.
S4, judging whether the actual rotation speed of the generator reaches a generator rotation speed threshold value n, if so, executing S5, otherwise, continuing executing S4. Step S3 and step S4 correspond to the (engine) start-up process in fig. 2 and 3.
S5, sending a generator rotating speed threshold value N as a generator rotating speed request value to a generator controller, sending an engine oil injection request (corresponding to the engine oil cut-off request of 0 in fig. 2 and 3) to the engine controller, sending 0 (namely 0 N.m) as an engine torque request value to the engine controller, and lasting for a preset first time (such as 1S), and then executing S6. Step S5 corresponds to the (engine) smoothing process in fig. 2, 3.
And S6, sending a generator rotating speed threshold value N as a generator rotating speed request value to a generator controller, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold (-30 N.m) as an engine torque request value to the engine controller, enabling the generator to rotate at the generator rotating speed threshold value N and drag the engine to operate, forming a reverse dragging working condition of the engine, lasting for a second time, and then executing S7. The engine controller may complete the oxygen sensor diagnostic within the second time. And inquiring a preset time table according to the vehicle speed to obtain a second time, wherein the preset time table is a corresponding relation table of the vehicle speed and the second time obtained through a calibration mode, and the larger the vehicle speed is, the shorter the second time is. The second time obtained by looking up the table in this example was 3s. Step S6 corresponds to the reverse dragging process in fig. 2 and 3.
And S7, judging whether the opening degree of the accelerator pedal is larger than 0, if so, executing S8, otherwise, executing S9.
S8, determining a generator rotating speed request value and an engine torque request value according to the driver demand, sending the generator rotating speed request value (namely, the generator rotating speed request value determined according to the driver demand) to a generator controller, sending the engine torque request value (namely, the engine torque request value determined according to the driver demand) and an engine oil injection request to the engine controller so as to enable the engine to normally generate electricity, and ending. Step S8 corresponds to the (engine) normal power generation process in fig. 3.
And S9, sequentially sending i rotating speed values II to the generator controller as generator rotating speed request values according to the sequence from large to small, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold (-30 N.m) to the engine controller as an engine torque request value so as to stop the engine, and ending. Wherein the kth rotational speed value IIn 2k The method meets the following conditions:
k is more than or equal to 1 and less than or equal to i. Step S9 corresponds to the engine shutdown in fig. 2. />
Claims (4)
1. A control method for oxygen sensor diagnosis of an extended-range hybrid vehicle, comprising:
s1, acquiring road condition information, accumulated driving mileage, an oxygen sensor diagnosis state, an engine speed, an actual speed of a generator, a vehicle speed and an accelerator pedal opening, and then executing S2;
s2, judging whether the oxygen sensor diagnosis triggering condition is met, if so, executing S3, otherwise, ending;
s3, determining a generator rotating speed threshold n according to the vehicle speed, sequentially sending i rotating speed values I to a generator controller as generator rotating speed request values according to the sequence from small to large, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold as an engine torque request value to the engine controller, and then executing S4; wherein the j-th rotation speed value in 1j The method meets the following conditions:
，
representing the dividing gradient of the rotating speed threshold value, wherein j is more than or equal to 1 and less than or equal to i;
s4, judging whether the actual rotation speed of the generator reaches a generator rotation speed threshold value n, if so, executing S5, otherwise, continuing executing S4;
s5, sending a generator rotating speed threshold value n as a generator rotating speed request value to a generator controller, sending an engine oil injection request to the engine controller, sending 0 as an engine torque request value to the engine controller, and continuously for a preset first time, and then executing S6;
s6, sending a generator rotating speed threshold value n as a generator rotating speed request value to a generator controller, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold value as an engine torque request value to the engine controller, lasting for a second time, and then executing S7;
s7, judging whether the opening of the accelerator pedal is larger than 0, if so, executing S8, otherwise, executing S9;
s8, determining a generator rotating speed request value and an engine torque request value according to the driver demand, sending the generator rotating speed request value to a generator controller, sending the engine torque request value and an engine oil injection request to the engine controller, and ending;
s9, sequentially sending i rotating speed values II as generator rotating speed request values to a generator controller according to the sequence from large to small, sending an engine oil-break request to the engine controller, sending a preset engine torque threshold value as an engine torque request value to the engine controller, and ending; wherein the kth rotational speed value IIn 2k The method meets the following conditions:
， 1≤k≤i。
2. the control method for oxygen sensor diagnosis of an extended-range hybrid vehicle according to claim 1, characterized in that:
if the condition 1a or the condition 1b is satisfied, the condition indicates that the oxygen sensor diagnosis triggering condition is satisfied;
condition 1a is: when the road condition information is a high-speed road condition, dividing the accumulated driving mileage by a preset first mileage threshold value to be an integer, wherein the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine speed and the actual speed of the generator are equal to 0;
condition 1b is: when the road condition information is a non-high-speed road condition, dividing the accumulated driving mileage by a preset second mileage threshold value to be an integer, wherein the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine speed and the actual speed of the generator are both equal to 0;
the preset first mileage threshold value is larger than the preset second mileage threshold value.
3. The control method for oxygen sensor diagnosis of an extended-range hybrid vehicle according to claim 1 or 2, characterized in that:
the mode of determining the generator rotation speed threshold value n according to the vehicle speed is as follows: inquiring a preset rotating speed threshold value table according to the vehicle speed to obtain a rotating speed threshold value n of the generator; the preset rotation speed threshold value table is a corresponding relation table of the vehicle speed and the rotation speed threshold value of the generator, which is obtained in a calibration mode, wherein the larger the vehicle speed is, the larger the rotation speed threshold value of the generator is;
the second time is determined according to the vehicle speed, and the specific mode is as follows: inquiring a preset time table according to the vehicle speed to obtain the second time; the preset timetable is a corresponding relation table of the vehicle speed and the second time, which is obtained through a calibration mode, and the second time is shorter as the vehicle speed is higher.
4. The utility model provides a control system of oxygen sensor diagnosis of range-extending hybrid vehicle, includes whole car controller, its characterized in that: the vehicle controller is programmed to execute the control method according to any one of claims 1 to 3.
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