CN113864073A - 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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- CN113864073A CN113864073A CN202111140177.8A CN202111140177A CN113864073A CN 113864073 A CN113864073 A CN 113864073A CN 202111140177 A CN202111140177 A CN 202111140177A CN 113864073 A CN113864073 A CN 113864073A
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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
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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
- F02D29/06—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
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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
- F02D41/30—Controlling fuel injection
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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
- 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 oxygen sensor diagnosis of an extended range hybrid electric vehicle, which are characterized in that based on road condition information provided by map navigation and accumulated driving mileage of the vehicle, different engine rotating speed request values are sent to a generator controller, an engine fuel cut/fuel injection request is sent to an engine controller, and different engine torque request values are sent to the engine controller, so that an engine is started regularly to form a towing working condition of the engine, and the oxygen sensor diagnosis is conveniently carried out by the engine controller.
Description
Technical Field
The invention belongs to the field of automobile control, and particularly relates to a control method and a system for oxygen sensor diagnosis 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 an automobile and improving the fuel combustion quality of an automobile engine. Once the front oxygen sensor fails, the engine controller cannot obtain the information of the oxygen concentration in the exhaust pipe, so that the air-fuel ratio cannot be subjected to feedback control, the oil consumption and exhaust pollution of the engine are increased, and the engine has the fault phenomena of unstable idling, misfire and the like; once the rear oxygen sensor fails, whether the three-way catalytic converter fails or not can not be identified in time, and the phenomena of increased emission pollution, black smoke emission and the like of the whole vehicle can occur.
The engine of the extended-range hybrid electric vehicle is not directly driven, the engine is lack of the back-dragging working condition of the engine, and the engine controller cannot carry out oxygen sensor diagnosis (because the oxygen sensor diagnosis must be carried out under the back-dragging working condition of the engine); therefore, it is necessary to design a method and a system for controlling oxygen sensor diagnosis of an extended range hybrid vehicle.
Disclosure of Invention
The invention aims to provide a control method and a system for oxygen sensor diagnosis of an extended range hybrid electric vehicle, so as to form a back-dragging working condition of an engine and facilitate oxygen sensor diagnosis of an engine controller.
The invention relates to a control method for oxygen sensor diagnosis of an extended range hybrid electric vehicle, which comprises the following steps:
and S1, acquiring road condition information, accumulating the driving mileage, diagnosing the state of the oxygen sensor, rotating speed of the engine, actual rotating speed of the generator, vehicle speed and opening degree of an accelerator pedal, and executing S2.
And S2, judging whether the oxygen sensor diagnosis trigger condition is met, if so, executing S3, and if not, ending.
S3, determining a generator rotating speed threshold value n according to the vehicle speed, sequentially sending i rotating speed values I as generator rotating speed request values to a generator controller, sending an engine fuel cut request to an engine controller, sending a preset engine torque threshold value as an engine torque request value to the engine controller, and then executing S4. Wherein the j-th rotation speed value In1jSatisfies the following conditions:
representing the division gradient of the rotating speed threshold value, j is more than or equal to 1 and less than or equal to i.
S4, judging whether the actual rotating speed of the generator reaches the threshold value n of the rotating speed of the generator, if so, executing S5, otherwise, continuing executing S4.
And S5, sending the generator speed threshold value n to the generator controller as a generator speed request value, sending an engine oil injection request to the engine controller, sending 0 to the engine controller as an engine torque request value for a preset first time, and then executing S6.
And S6, sending the generator rotating speed threshold value n to the generator controller as a generator rotating speed request value, sending an engine fuel cut request to the engine controller, sending a preset engine torque threshold value to the engine controller as an engine torque request value, so that the generator rotates at the generator rotating speed threshold value n and drags the engine to run, forming a dragging working condition of the engine, continuing for a second time, and then executing S7. The engine controller may complete the oxygen sensor diagnostic during 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 requested value of the generator speed and a requested value of the engine torque according to the driver ' S demand, transmitting the requested value of the generator speed (i.e., the requested value of the generator speed determined according to the driver ' S demand) to the generator controller, transmitting the requested value of the engine torque (i.e., the requested value of the engine torque determined according to the driver ' S demand) and a request of the engine fuel injection to the engine controller so that the engine normally generates power, and then ending.
S9, sequentially sending the i rotating speed values II as generator rotating speed request values to a generator controller, sending an engine fuel cut-off request to an engine controller, and sending a preset engine torque threshold value as an engine torque request value to the engine according to the sequence from large to smallAnd a controller to stop the engine and then end. Wherein the k-th rotation speed value IIn2kSatisfies the following conditions:
1≤k≤i。
preferably, the condition 1a or the condition 1b is satisfied, which indicates that the oxygen sensor diagnosis trigger condition is satisfied.
Condition 1a is: when the road condition information is a high-speed road condition, the accumulated driving mileage divided by a preset first mileage threshold value is an integer, the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine rotating speed and the actual rotating speed of the generator are both equal to 0.
Condition 1b is: and when the road condition information is the non-high speed road condition, the accumulated driving mileage divided by a preset second mileage threshold value is an integer, the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine rotating speed and the actual rotating speed of the generator are both equal to 0.
Wherein the preset first mileage threshold is greater than a preset second mileage threshold.
Preferably, the mode of determining the generator 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 rotating speed threshold value table is a corresponding relation table of the vehicle speed and the rotating speed threshold value of the generator obtained through a calibration mode, and the larger the vehicle speed is, the larger the rotating 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 time table is a corresponding relation table of the vehicle speed and the second time obtained in a calibration mode, and the larger the vehicle speed is, the shorter the second time is.
The control system for oxygen sensor diagnosis of the extended range hybrid electric vehicle comprises a vehicle control unit which is programmed to execute the control method.
The engine can be started regularly based on road condition information provided by map navigation and the accumulated driving mileage of the vehicle, so that the back-dragging working condition of the engine is formed, and the diagnosis of the oxygen sensor by the engine controller is facilitated; the engine controller can diagnose the fault of the oxygen sensor in time so as to be maintained in time, and the phenomena of unstable idling and increased oil consumption and emission are reduced.
Drawings
Fig. 1 is a control interaction diagram of oxygen sensor diagnosis of the extended range hybrid vehicle according to the embodiment.
Fig. 2 is an execution timing chart of the engine stop after the completion of the oxygen sensor diagnosis in the present embodiment.
Fig. 3 is an execution timing chart of normal power generation of the engine after completion of diagnosis of the oxygen sensor in the present embodiment.
Fig. 4 is a control flowchart of oxygen sensor diagnosis of the extended range hybrid vehicle according to the embodiment.
Detailed Description
As shown in fig. 1, the control system for oxygen sensor diagnosis of an extended range hybrid electric vehicle in the embodiment includes a vehicle controller, and the 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 control unit CAN acquire the accumulated running 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 diagnostic state of the oxygen sensor and the engine speed provided by the engine controller, CAN acquire the actual generator speed provided by the generator controller, and CAN acquire the vehicle speed and the opening degree of an accelerator pedal from the CAN bus. The vehicle control unit is programmed to execute the control method described below.
As shown in fig. 2 to 4, the control method for oxygen sensor diagnosis of the extended range hybrid electric vehicle in the embodiment is executed by the vehicle controller, and the control method includes:
and S1, acquiring road condition information, accumulating the driving mileage, diagnosing the state of the oxygen sensor, rotating speed of the engine, actual rotating speed of the generator, vehicle speed and opening degree of an accelerator pedal, and executing S2.
And S2, judging whether the oxygen sensor diagnosis trigger condition is met, if so, executing S3, and if not, ending.
When the condition 1a or the condition 1b is satisfied, it indicates that the oxygen sensor diagnosis trigger condition is satisfied (corresponding to the oxygen sensor diagnosis trigger condition in fig. 2 and 3 being 1).
Condition 1a is: when the road condition information is a high-speed road condition, the accumulated driving mileage divided by a preset first mileage threshold (for example, 1000m) is an integer, the oxygen sensor diagnosis state indicates that diagnosis is required (that is, the oxygen sensor diagnosis state is 1), and the engine speed and the actual generator speed are both equal to 0.
Condition 1b is: when the road condition information is the non-highway condition, the accumulated driving mileage divided by the preset second mileage threshold (for example, 500m) is an integer, the oxygen sensor diagnosis state indicates that diagnosis is required (that is, the oxygen sensor diagnosis state is 1), and the engine speed and the actual generator speed are both 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 as generator rotating speed request values to a generator controller from small to large, sending an engine fuel cut request (corresponding to the engine fuel cut request value in the figures 2 and 3 is 1) to an engine controller, sending a preset engine torque threshold value as an engine torque request value to the engine controller, and then executing S4; wherein the j-th rotation speed value In1jSatisfies the following conditions:
and j is more than or equal to 1 and less than or equal to i, the preset rotating speed threshold value table is a corresponding relation table of the vehicle speed and the rotating speed threshold value of the generator obtained in a calibration mode, and the larger the vehicle speed is, the larger the rotating speed threshold value of the generator is. In the embodiment, the generator rotating speed threshold N obtained by looking up a table is 1500rpm, and the preset engine torque threshold is-30 N.m.
S4, judging whether the actual rotating speed of the generator reaches the threshold value n of the rotating speed of the generator, if so, executing S5, otherwise, continuing executing S4. Step S3 and step S4 correspond to the (engine) starting process in fig. 2 and 3.
S5, transmitting the generator speed threshold value N to the generator controller as a generator speed request value, transmitting an engine fuel injection request (corresponding to 0 for the engine fuel cut request in fig. 2 and 3) to the engine controller, transmitting 0 (i.e., 0N · m) to the engine controller as an engine torque request value, and continuing for a preset first time (e.g., 1S), and then executing S6. Step S5 corresponds to the (engine) smoothing process in fig. 2 and 3.
And S6, sending the generator rotating speed threshold value N to the generator controller as a generator rotating speed request value, sending an engine fuel cut request to the engine controller, sending a preset engine torque threshold value (-30N m) to the engine controller as an engine torque request value, so that the generator rotates at the generator rotating speed threshold value N and drags the engine to run, forming a back-dragging working condition of the engine, continuing for a second time, and then executing S7. The engine controller may complete the oxygen sensor diagnostic during the second time. And inquiring a preset time table according to the vehicle speed to obtain the second time, wherein the preset time table is a corresponding relation table of the vehicle speed and the second time obtained in a calibration mode, and the second time is shorter when the vehicle speed is higher. The second time obtained by looking up the table in this example was 3 s. Step S6 corresponds to the drag-and-drop 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 requested value of the generator speed and a requested value of the engine torque according to the driver ' S demand, transmitting the requested value of the generator speed (i.e., the requested value of the generator speed determined according to the driver ' S demand) to the generator controller, transmitting the requested value of the engine torque (i.e., the requested value of the engine torque determined according to the driver ' S demand) and a request of the engine fuel injection to the engine controller so that the engine normally generates power, and then ending. Step S8 corresponds to the (engine) normal power generation process in fig. 3.
S9, sequentially sending the i rotating speed values II as generator rotating speed request values to the generator controller from large to small, and sending the engine fuel cut-off request to the engine controllerAnd the controller is used for sending a preset engine torque threshold value (-30N m) as an engine torque request value to the engine controller so as to stop the engine, and then ending. Wherein the k-th rotation speed value IIn2kSatisfies the following conditions:
k is more than or equal to 1 and less than or equal to i. Step S9 corresponds to the engine stop in fig. 2.
Claims (4)
1. A control method for oxygen sensor diagnosis of an extended range hybrid vehicle is characterized by comprising the following steps:
s1, acquiring road condition information, accumulating the driving mileage, diagnosing the state of an oxygen sensor, the rotating speed of an engine, the actual rotating speed of a generator, the vehicle speed and the opening degree of an accelerator pedal, and then executing S2;
s2, judging whether the oxygen sensor diagnosis trigger condition is met, if so, executing S3, otherwise, ending;
s3, determining a generator rotating speed threshold value n according to the vehicle speed, sequentially taking the i rotating speed values I as generator rotating speed request values to be sent to a generator controller from small to large, sending an engine fuel cut request to an engine controller, taking a preset engine torque threshold value as an engine torque request value to be sent to the engine controller, and then executing S4; wherein the j-th rotation speed value In1jSatisfies the following conditions:
j is more than or equal to 1 and less than or equal to i;
s4, judging whether the actual rotating speed of the generator reaches the rotating speed threshold n of the generator, 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 an engine controller, sending 0 as an engine torque request value to the engine controller, continuing for a preset first time, and then executing S6;
s6, sending the generator speed threshold value n as a generator speed request value to a generator controller, sending an engine fuel cut request to an engine controller, sending a preset engine torque threshold value as an engine torque request value to the engine controller, continuing for a second time, and then executing S7;
s7, judging whether the opening degree of an accelerator pedal is larger than 0, if so, executing S8, otherwise, executing S9;
s8, determining a requested value of the rotating speed of the generator and a requested value of the torque of the engine according to the requirement of a driver, sending the requested value of the rotating speed of the generator to a generator controller, sending the requested value of the torque of the engine and a request of fuel injection of the engine to the engine controller, and then ending;
s9, sequentially taking the i rotating speed values II as generator rotating speed request values to be sent to a generator controller, sending an engine fuel cut-off request to an engine controller, taking a preset engine torque threshold value as an engine torque request value to be sent to the engine controller, and then ending; wherein the k-th rotation speed value IIn2kSatisfies the following conditions:
2. the control method of the oxygen sensor of the extended range hybrid vehicle according to claim 1, characterized in that:
if the condition 1a or the condition 1b is satisfied, indicating that the oxygen sensor diagnosis trigger condition is satisfied;
condition 1a is: when the road condition information is a high-speed road condition, the accumulated driving mileage divided by a preset first mileage threshold value is an integer, the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine rotating speed and the actual rotating speed of the generator are both equal to 0;
condition 1b is: when the road condition information is a non-high speed road condition, the accumulated driving mileage divided by a preset second mileage threshold value is an integer, the diagnosis state of the oxygen sensor indicates that diagnosis is required, and the engine rotating speed and the actual rotating speed of the generator are both equal to 0;
wherein the preset first mileage threshold is greater than a preset second mileage threshold.
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 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 rotating speed threshold value table is a corresponding relation table of a vehicle speed and a generator rotating speed threshold value obtained through a calibration mode, and the larger the vehicle speed is, the larger the generator rotating speed threshold value 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 time table is a corresponding relation table of the vehicle speed and the second time obtained in a calibration mode, and the larger the vehicle speed is, the shorter the second time is.
4. The utility model provides a diagnostic control system of oxygen sensor of extended range formula hybrid vehicle, includes vehicle control unit, its characterized in that: the vehicle control unit is programmed to carry out the control method according to any one of claims 1 to 3.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116006338A (en) * | 2023-01-31 | 2023-04-25 | 重庆长安新能源汽车科技有限公司 | Control method and device for electronic injection system of range-extending engine and vehicle |
| CN116006338B (en) * | 2023-01-31 | 2024-06-21 | 深蓝汽车科技有限公司 | Control method and device for electronic injection system of range-extending engine and vehicle |
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