CN116857102A - Method for controlling starting of P-gear engine of hybrid electric vehicle - Google Patents
Method for controlling starting of P-gear engine of hybrid electric vehicle Download PDFInfo
- Publication number
- CN116857102A CN116857102A CN202210313875.1A CN202210313875A CN116857102A CN 116857102 A CN116857102 A CN 116857102A CN 202210313875 A CN202210313875 A CN 202210313875A CN 116857102 A CN116857102 A CN 116857102A
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- engine
- starting
- torque
- isg motor
- whole vehicle
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims 1
- 230000009467 reduction Effects 0.000 description 27
- 230000005540 biological transmission Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001960 triggered effect Effects 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
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0859—Circuits or control means specially adapted for starting of engines specially adapted to the type of the starter motor or integrated into it
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N11/00—Starting of engines by means of electric motors
- F02N11/08—Circuits or control means specially adapted for starting of engines
- F02N11/0803—Circuits or control means specially adapted for starting of engines characterised by means for initiating engine start or stop
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/02—Parameters used for control of starting apparatus said parameters being related to the engine
- F02N2200/022—Engine speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N2200/00—Parameters used for control of starting apparatus
- F02N2200/08—Parameters used for control of starting apparatus said parameters being related to the vehicle or its components
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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)
Abstract
The invention discloses a method for controlling the starting of a P-gear engine of a hybrid electric vehicle, which comprises the following steps: s1, triggering an engine starting condition; s2, entering a first stage of a starting process, enabling the ISG motor to enter a torque mode, and pulling up the rotating speed of the engine, wherein the running state of the engine is dragging rotation; s3, when the rotation speed of the engine is pulled up to the first set rotation speed, entering a second stage of the starting process, wherein the running state of the engine is starting; and S4, when the rotation speed of the engine is increased to the second set rotation speed, entering a third stage of the starting process, switching the running state of the engine into running, ending the starting process of the engine, and controlling the torque of the ISG motor to adjust the rotation speed of the engine and generate power for the whole vehicle, wherein the whole vehicle running mode is a mixed running condition. According to the method for controlling the starting of the P-gear engine of the hybrid electric vehicle, disclosed by the invention, the starting process is controlled in a sectionalized manner according to the actual rotating speed of the engine and the running state of the engine, so that the smoothness of starting the engine can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of hybrid electric vehicles, and particularly relates to a method for controlling the starting of a P-gear engine of a hybrid electric vehicle.
Background
Compared with the traditional automobile which can only rely on the engine as a power source, the hybrid electric vehicle has the characteristics of quick torque response, quietness and the like relative to the engine in terms of driving experience, can greatly improve the driving pleasure of a driver, simultaneously has the advantages of saving energy, reducing emission pollution, being more environment-friendly and the like, and is a new trend of technical development of the automobile industry when the regulations of oil consumption and emission policies are severe and the environment is green and environment-friendly.
The prior art has the problems that when the hybrid electric vehicle is started, the smoothness of the engine is poor, and the driving comfort is affected.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a method for controlling the starting of a P-gear engine of a hybrid electric vehicle, and aims to improve the smoothness of the starting of the engine.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the method for controlling the starting of the P-gear engine of the hybrid electric vehicle comprises the following steps:
s1, triggering an engine starting condition;
s2, entering a first stage of a starting process, enabling the ISG motor to enter a torque mode, and pulling up the rotating speed of the engine, wherein the running state of the engine is dragging rotation;
s3, when the rotation speed of the engine is increased to the first set rotation speed, entering a second stage of a starting process, and starting fuel injection and ignition of the engine, meanwhile, calculating torque required to be provided by the ISG motor by the whole vehicle controller, and sending the torque to the ISG motor for execution, wherein the running state of the engine is starting;
and S4, when the rotation speed of the engine is increased to the second set rotation speed, entering a third stage of a starting process, controlling the torque of the ISG motor by the whole vehicle controller, and when the engine can respond to the torque request and then the running state of the engine is switched to run, ending the starting process of the engine, and controlling the torque of the ISG motor to adjust the rotation speed of the engine and generate power for the whole vehicle under the condition that the whole vehicle running mode is a mixed running condition.
In the step S1, the vehicle controller comprehensively determines whether the vehicle has a request for starting the engine according to the engine water temperature, the opening of the accelerator pedal, the SOC of the power battery, and the air conditioner refrigerating or heating request, and when the conditions are satisfied, the engine starting conditions are triggered.
In step S2, the whole vehicle controller sends a torque mode request to the ISG motor, calculates a target torque required by the towing engine according to a preset target angular acceleration of a sun gear connected with the engine, sends a target torque value to the ISG motor, and after the ISG motor enters the torque mode, increases the engine speed according to the target torque and a torque change gradient sent by the whole vehicle controller, in the process, fuel injection ignition of the engine is not allowed, and the engine running state is towing rotation.
In the step S3, after the jump condition of the second stage of the starting process is met, the whole vehicle controller sends an oil injection command to the engine controller, controls the engine to perform oil injection ignition and sends a target torque to the engine controller, and meanwhile, the whole vehicle controller calculates the torque required to be provided by the ISG motor through the actual rotation speed and the target rotation speed of the engine and sends the torque to the ISG motor to be executed, and the running state of the engine is started.
In the step S3, the target torque is 5Nm.
In the step S3, the first set rotational speed is 700rpm.
In the step S4, the second set rotational speed is 900rpm.
According to the method for controlling the starting of the P-gear engine of the hybrid electric vehicle, disclosed by the invention, the starting process is controlled in a sectional manner according to the actual rotating speed of the engine and the running state of the engine, the starting logic of the P-gear engine is reasonably formulated, and the smoothness of the starting of the engine can be effectively improved.
Drawings
The present specification includes the following drawings, the contents of which are respectively:
FIG. 1 is a timing diagram of the P-speed engine start logic signal of the present invention;
FIG. 2 is a schematic diagram of a power split hybrid transmission of the present invention;
marked in the figure as:
1. a housing; 2. a driving motor; 3. an ISG motor; 4. a first shaft; 5. a second shaft; 6. a third shaft; 7. a fourth shaft; 8. a first sun gear; 9. a second sun gear; 10. a first planetary gear; 11. a second planetary gear; 12. a torsional vibration damper; 13. a planet carrier; 14. a fifth shaft; 15. a first reduction gear; 16. a second reduction gear; 17. a third reduction gear; 18. a fourth reduction gear; 19. a fifth reduction gear; 20. a sixth reduction gear; 21. a differential assembly; 22. and a half shaft.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.
It should be noted that, in the following embodiments, the "first" and "second" do not represent an absolute distinction between structures and/or functions, and do not represent a sequential order of execution, but are merely for convenience of description.
The invention provides a method for controlling the starting of a P-gear engine of a hybrid electric vehicle. The invention relates to a control method of a P-gear engine starting logic of a hybrid electric vehicle, which divides the engine starting process into 3 stages, and after meeting the skip conditions of each stage, a whole vehicle controller controls an ISG motor and the engine to complete corresponding instructions, wherein the control method of the P-gear engine starting logic comprises the following steps:
s1, triggering an engine starting condition;
s2, entering a first stage of a starting process, enabling the ISG motor to enter a torque mode, and pulling up the rotating speed of the engine, wherein the running state of the engine is dragging rotation;
s3, when the rotation speed of the engine is increased to the first set rotation speed, entering a second stage of a starting process, and starting fuel injection and ignition of the engine, meanwhile, calculating torque required to be provided by the ISG motor by the whole vehicle controller, and sending the torque to the ISG motor for execution, wherein the running state of the engine is starting;
and S4, when the rotation speed of the engine is increased to the second set rotation speed, entering a third stage of a starting process, controlling the torque of the ISG motor by the whole vehicle controller, and when the engine can respond to the torque request and then the running state of the engine is switched to run, ending the starting process of the engine, and controlling the torque of the ISG motor to adjust the rotation speed of the engine and generate power for the whole vehicle under the condition that the whole vehicle running mode is a mixed running condition.
As shown in fig. 2, the power split type hybrid transmission structure is applied to a power split type hybrid vehicle, and the hybrid vehicle adopts a double-row planetary gear structure, wherein a first sun gear is connected to a generator, a second sun gear is connected to an engine, and a planet carrier PC is connected with a differential through two pairs of gears. Specifically, such a hybrid transmission includes a housing 1, a drive motor 2, an ISG motor 3, a differential assembly 21, a first shaft 4, a second shaft 5, a third shaft 6, a fourth shaft 7, a stepped planetary gear set, and a power transmission mechanism, the drive motor 2, the ISG motor 3, the differential assembly 21, the first shaft 4, the second shaft 5, the third shaft 6, the fourth shaft 7, the stepped planetary gear set, and the power transmission mechanism being provided inside the housing 1. The step type planetary gear set comprises a first sun gear 8, a second sun gear 9, first planet gears 10, second planet gears 11 and a planet carrier 13, wherein the first sun gear 8 and the second sun gear 9 are coaxially arranged, the first planet gears 10 and the second planet gears 11 are all arranged in a plurality, the number of the first planet gears 10 and the number of the second planet gears 11 are the same, and each first planet gear 10 is fixedly connected with one second planet gear 11 in a coaxial mode. The first sun gear 8 meshes with a first planetary gear 10, the second sun gear 9 meshes with a second planetary gear 11, and the first planetary gear 10 and the second planetary gear 11 are rotatably arranged on a planet carrier 13. The first sun gear 8 is connected with the first shaft 4, the first shaft 4 is connected with the ISG motor 3, the second sun gear 9 is connected with the second shaft 5, the second shaft 5 is connected with the torsional damper 12, the engine is connected with the torsional damper 12, and the first shaft 4 and the second shaft 5 are coaxially arranged. The driving motor 2 and the ISG motor 3 are coaxially arranged, a stepped planetary gear set is positioned between the driving motor 2 and the torsional damper 12, and the driving motor 2 is positioned between the stepped planetary gear set and the ISG motor 3. The power transmission mechanism includes a third shaft 6 connected to the carrier 13, a first reduction gear 15 connected to the third shaft 6, a second reduction gear 16 meshed with the first reduction gear 15, a fourth shaft 7 connected to the drive motor 2, a third reduction gear 17 connected to the fourth shaft 7, a fourth reduction gear 18 meshed with the third reduction gear 17, a fifth reduction gear 19 provided on the fifth shaft 14, and a sixth reduction gear 20 meshed with the fifth reduction gear 19, the sixth reduction gear 20 being provided on the differential assembly 21. The fifth shaft 14 is parallel to the first shaft 4, the second reduction gear 16, the fourth reduction gear 18 and the fifth reduction gear 19 are fixedly arranged on the fifth shaft 14, the sixth reduction gear 20 is fixedly connected with the differential assembly 21, the diameter of the fifth reduction gear 19 is smaller than that of the sixth reduction gear 20, and the fifth reduction gear 19 is located between the second reduction gear 16 and the fourth reduction gear 18.
As shown in fig. 2, the third shaft 6 and the fourth shaft 7 are hollow shafts, the third shaft 6 is sleeved on the second shaft 5, the second shaft 5 and the third shaft 6 are coaxially arranged, the fourth shaft 7 is sleeved on the first shaft 4, the fourth shaft 7 and the first shaft 4 are coaxially arranged, and the stepped planetary gear set is located between the first reduction gear 15 and the third reduction gear 17.
The P-gear engine starting strategy of the hybrid electric vehicle is applied to the power split type hybrid electric vehicle; the gearbox of a hybrid vehicle adopts a double row planetary gear structure in which a first sun gear 8 is connected to an ISG motor and a second sun gear 9 is connected to the engine, and a carrier 13 is connected to a differential through two pairs of gears.
After the whole vehicle is electrified strongly, the vehicle is fault-free and is in a P gear, when the engine starting requirement exists at the moment, the engine starting process is divided into 3 stages, after the jump condition of each stage is met, the whole vehicle controller controls the ISG motor and the engine to complete corresponding instructions, and then the whole engine starting process is completed.
In the step S1, the vehicle controller comprehensively determines whether the vehicle has a request for starting the engine according to the engine water temperature, the opening of the accelerator pedal, the SOC of the power battery, and the air conditioner refrigerating or heating request, and triggers the engine starting condition when the condition is satisfied.
In the step S2, the whole vehicle controller sends a torque mode request to the ISG motor, calculates a target torque required by the towing engine according to a preset target angular acceleration of a sun gear connected with the engine, sends a target torque value to the ISG motor, and after the ISG motor enters the torque mode, increases the engine speed according to a target torque and a torque change gradient sent by the whole vehicle controller, in the process, fuel injection ignition of the engine is not allowed, and the engine running state is towing.
In the step S3, after the jump condition of the second stage of the starting process is met, the whole vehicle controller sends an oil injection command to the engine controller, controls the engine to perform oil injection ignition and sends a target torque to the engine controller, and meanwhile, the whole vehicle controller calculates the torque required to be provided by the ISG motor through the actual rotation speed and the target rotation speed of the engine and sends the torque to the ISG motor to be executed, and the running state of the engine is started.
In the above step S3, the target torque is 5Nm.
In the above step S3, the first set rotational speed is 700rpm.
In the above step S4, the second set rotational speed was 900rpm.
The invention is described above by way of example with reference to the accompanying drawings. It will be clear that the invention is not limited to the embodiments described above. As long as various insubstantial improvements are made using the method concepts and technical solutions of the present invention; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.
Claims (7)
1. The method for controlling the starting of the P-gear engine of the hybrid electric vehicle is characterized by comprising the following steps:
s1, triggering an engine starting condition;
s2, entering a first stage of a starting process, enabling the ISG motor to enter a torque mode, and pulling up the rotating speed of the engine, wherein the running state of the engine is dragging rotation;
s3, when the rotation speed of the engine is increased to the first set rotation speed, entering a second stage of a starting process, and starting fuel injection and ignition of the engine, meanwhile, calculating torque required to be provided by the ISG motor by the whole vehicle controller, and sending the torque to the ISG motor for execution, wherein the running state of the engine is starting;
and S4, when the rotation speed of the engine is increased to the second set rotation speed, entering a third stage of a starting process, controlling the torque of the ISG motor by the whole vehicle controller, and when the engine can respond to the torque request and then the running state of the engine is switched to run, ending the starting process of the engine, and controlling the torque of the ISG motor to adjust the rotation speed of the engine and generate power for the whole vehicle under the condition that the whole vehicle running mode is a mixed running condition.
2. The method according to claim 1, wherein in step S1, the vehicle controller comprehensively determines whether the vehicle has an engine starting request according to an engine water temperature, an accelerator pedal opening, a power battery SOC, an air conditioner cooling or heating request, and triggers an engine starting condition when a condition is satisfied.
3. The method according to claim 1 or 2, wherein in the step S2, the whole vehicle controller sends a torque mode request to the ISG motor, calculates a target torque required by the towing engine according to a preset target angular acceleration of a sun gear connected with the engine, sends a target torque value to the ISG motor, and after the ISG motor enters the torque mode, increases the engine speed according to the target torque and a torque change gradient sent by the whole vehicle controller, in the process, fuel injection and ignition of the engine are not allowed, and the engine running state is towing.
4. The method according to claim 1 or 2, wherein in step S3, after the skip condition of the second stage of the starting process is satisfied, the whole vehicle controller sends an oil injection command to the engine controller to control the oil injection ignition of the engine and send a target torque to the engine controller, and meanwhile, the whole vehicle controller calculates the torque required by the ISG motor through the actual engine speed and the target engine speed and sends the torque to the ISG motor for execution, and the engine running state is the starting state.
5. The method according to claim 4, wherein in step S3, the target torque is 5Nm.
6. The method according to claim 1 or 2, characterized in that in step S3, the first set rotational speed is 700rpm.
7. The method according to any one of claims 1 to 6, characterized in that in step S4, the second set rotational speed is 900rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210313875.1A CN116857102A (en) | 2022-03-28 | 2022-03-28 | Method for controlling starting of P-gear engine of hybrid electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210313875.1A CN116857102A (en) | 2022-03-28 | 2022-03-28 | Method for controlling starting of P-gear engine of hybrid electric vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116857102A true CN116857102A (en) | 2023-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210313875.1A Pending CN116857102A (en) | 2022-03-28 | 2022-03-28 | Method for controlling starting of P-gear engine of hybrid electric vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116857102A (en) |
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2022
- 2022-03-28 CN CN202210313875.1A patent/CN116857102A/en active Pending
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