CN-121973751-A - Control method and equipment for hybrid vehicle

CN121973751ACN 121973751 ACN121973751 ACN 121973751ACN-121973751-A

Abstract

The application discloses a control method and equipment for a hybrid vehicle, which belong to the technical field of vehicle control, wherein the hybrid vehicle comprises a hybrid system, the hybrid system comprises an electromagnetic one-way clutch, an engine, a generator and a driving motor, the method comprises the steps of determining a first target rotating speed of the engine according to an actual rotating speed of the driving motor, a first rotating speed ratio between the driving motor and the engine and a first rotating speed difference threshold value if the condition that the hybrid vehicle is switched into a parallel mode from a serial mode is detected, controlling the electromagnetic one-way clutch to be electrified after the actual rotating speed of the engine reaches the preset rotating speed threshold value if the first target rotating speed of the engine is larger than the preset rotating speed threshold value, controlling the actual rotating speed of the engine to reach the first target rotating speed after the electrifying of the electromagnetic one-way clutch is completed, and controlling the absolute value of torque of the generator to be reduced to zero after the actual rotating speed of the engine reaches the first target rotating speed, so that the working mode of the hybrid system is switched into the parallel mode from the serial mode.

Inventors

PI DONG
XIE WEN
Tan Huaqian
ZHANG ZHONG
LI YONGQIANG

Assignees

岚图汽车科技股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260227

Claims (15)

1. A control method of a hybrid vehicle, characterized in that the hybrid vehicle includes a hybrid system including an electromagnetic one-way clutch, an engine, a generator, and a drive motor, a driving end of the electromagnetic one-way clutch is connected with the engine, a driven end of the electromagnetic one-way clutch is connected with the drive motor, and the engine is further connected with the generator, the method comprising: If the condition of switching from the series mode to the parallel mode is detected, determining a first target rotating speed of the engine according to the actual rotating speed of the driving motor, a first rotating speed ratio between the driving motor and the engine and a first rotating speed difference threshold value; if the first target rotating speed of the engine is larger than a preset rotating speed threshold value, controlling the actual rotating speed of the engine to reach the preset rotating speed threshold value, and controlling the electromagnetic one-way clutch to be electrified; after the electromagnetic one-way clutch is electrified, controlling the actual rotating speed of the engine to reach the first target rotating speed; and after the actual rotating speed of the engine reaches the first target rotating speed, controlling the absolute value of the torque of the generator to be reduced to zero so as to switch the working mode of the hybrid system from a series mode to a parallel mode.
2. The control method of a hybrid vehicle according to claim 1, characterized in that the controlling the absolute value of the torque of the generator to decrease to zero includes: determining a torque slope of the generator based on a rotational speed difference between a driving end and a driven end of the electromagnetic one-way clutch and a resultant torque of the driving end of the electromagnetic one-way clutch; The absolute value of the torque of the generator is controlled to gradually decrease based on the torque slope until the absolute value of the torque of the generator decreases to zero.
3. The control method of a hybrid vehicle according to claim 2, wherein the determining a torque gradient of the generator based on a rotational speed difference between a driving end and a driven end of the electromagnetic one-way clutch and a resultant torque of the driving end of the electromagnetic one-way clutch includes: If the rotation speed difference is smaller than zero and the combined torque of the driving end of the electromagnetic one-way clutch is smaller than a preset torque, determining the torque slope of the generator as a first slope, wherein the first slope is larger than zero; And if the rotating speed difference is equal to zero, determining that the torque slope of the generator is a second slope, wherein the second slope is larger than the first slope.
4. A control method of a hybrid vehicle in accordance with claim 3, wherein said determining a torque gradient of said generator based on a rotational speed difference between a driving end and a driven end of said electromagnetic one-way clutch and a resultant torque of said driving end of said electromagnetic one-way clutch includes: And if the rotating speed difference is smaller than zero and the combined torque of the driving end of the electromagnetic one-way clutch reaches the preset torque, determining that the torque slope of the generator is zero.
5. The control method of a hybrid vehicle according to claim 2, characterized by further comprising: If the rotational speed difference is equal to zero, determining the combined torque of the drive end of the electromagnetic one-way clutch based on the actual torque of the engine, the actual torque of the generator and a second rotational speed ratio between the generator and the engine; Taking the product of the combined torque of the driving end of the electromagnetic one-way clutch and the third rotation speed ratio between the driving end of the electromagnetic one-way clutch and the front wheel end as the actual torque of the electromagnetic one-way clutch at the front wheel end; subtracting the actual torque of the electromagnetic one-way clutch at the front wheel end from the total required torque at the front wheel end to obtain the required torque of the driving motor at the front wheel end; Dividing the required torque of a driving motor at the front wheel end by a fourth rotation speed ratio between the driving motor and the front wheel end to obtain a first target torque of the driving motor; And controlling the actual torque of the driving motor based on the first target torque.
6. The control method of a hybrid vehicle according to any one of claims 1 to 5, characterized by further comprising: If the first target rotating speed is smaller than or equal to the preset rotating speed threshold value, adjusting the actual rotating speed of the engine to the first target rotating speed, and controlling the actual torque of the engine based on the actual rotating speed of the engine; Controlling the electromagnetic one-way clutch to be electrified; And after the electromagnetic one-way clutch is electrified, controlling the absolute value of the torque of the generator to gradually decrease until the absolute value of the torque of the generator decreases to zero, and switching the working mode of the hybrid system from a series mode to a parallel mode.
7. The control method of a hybrid vehicle according to any one of claims 1 to 5, characterized by further comprising: If the condition of switching from the parallel mode to the series mode is detected, the electromagnetic one-way clutch is controlled to be powered off, and in the power off process, the actual torque of the engine, the actual torque of the generator and the actual torque of the driving motor are controlled so that the rotating speed difference between the driving end and the driven end of the electromagnetic one-way clutch are smaller than zero; After the clutch is powered off and the rotation speed difference between the driving end and the driven end of the electromagnetic one-way clutch is smaller than a second rotation speed difference threshold value, controlling the actual rotation speed of the engine so that the rotation speed difference between the driving end and the driven end of the electromagnetic one-way clutch is smaller than or equal to the second rotation speed difference threshold value; and switching the working mode of the hybrid system from a parallel mode to a series mode.
8. The control method of a hybrid vehicle according to claim 7, characterized in that the controlling the actual torque of the engine, the generator, and the drive motor so that the difference in rotational speed between the drive end and the driven end of the electromagnetic one-way clutch is smaller than zero, includes: determining a second target torque corresponding to the engine in the fuel consumption economic interval based on the actual rotation speed of the engine; controlling an actual torque of the engine based on the second target torque and a target moment torque of the engine, wherein the target moment torque is the actual torque of the engine at a moment when it is determined that a switch from a parallel mode to a series mode is required; controlling an actual torque of the generator based on an actual rotational speed of the engine, the rotational speed difference, and vehicle speed variation information; the actual torque of the drive motor is controlled based on the total required torque of the front wheel end, the first speed ratio, the actual torque of the engine, the actual torque of the generator, and the second speed ratio between the generator and the engine.
9. The control method of the hybrid vehicle according to claim 8, characterized in that the controlling the actual torque of the engine based on the second target torque and the target time torque of the engine includes: If the second target torque is smaller than the target moment torque, determining a third target torque of the engine based on the second target torque; If the second target torque is greater than or equal to the target moment torque, determining a fourth target torque of the engine at the current moment based on the target moment torque, the second target torque, the maximum output torque of the generator and the external characteristic torque of the engine, and determining the smaller one of the fourth target torque at the current moment and the fourth target torque at the last moment as a third target torque of the engine; and controlling an actual torque of the engine based on the third target torque.
10. The control method of a hybrid vehicle according to claim 9, characterized by further comprising: and if the determined third target torque is smaller than or equal to zero, controlling the engine to cut off oil and stop.
11. The control method of a hybrid vehicle according to claim 8, characterized in that the controlling the actual torque of the generator based on the actual rotational speed of the engine, the rotational speed difference, and vehicle speed change information includes: determining a torque delta of the engine based on an actual rotational speed of the engine and the rotational speed difference; dividing the actual torque of the engine and the sum of the torque increment of the engine by the second rotation speed ratio to obtain a fifth target torque of the generator; Determining a torque variation gradient of the generator based on the vehicle speed variation information; the actual torque of the generator is controlled based on the fifth target torque and the torque variation gradient.
12. The control method of a hybrid vehicle according to claim 11, characterized in that the determining a torque variation gradient of the generator based on the vehicle speed variation information includes: If the vehicle speed change information represents the vehicle deceleration or uniform speed, determining the torque change gradient of the generator as a first gradient; and if the vehicle speed change information represents vehicle acceleration, determining that the torque change gradient of the generator is a second gradient, wherein the absolute value of the second gradient is smaller than that of the first gradient.
13. The control method of a hybrid vehicle according to claim 8, wherein the controlling the actual torque of the drive motor based on the total required torque of the front wheel end, the first speed ratio, the actual torque of the engine, the actual torque of the generator, and the second speed ratio between the generator and the engine includes: determining a resultant torque of a drive end of the electromagnetic one-way clutch based on an actual torque of the engine, an actual torque of the generator, and the second speed ratio; Taking the product of the combined torque of the driving end of the electromagnetic one-way clutch and the third rotation speed ratio between the driving end of the electromagnetic one-way clutch and the front wheel end as the actual torque of the electromagnetic one-way clutch at the front wheel end; Subtracting the larger one of the actual torque and zero torque of the electromagnetic one-way clutch at the front wheel end from the total required torque at the front wheel end to obtain the required torque of the driving motor at the front wheel end; Dividing the required torque of the driving motor at the front wheel end by a fourth rotation speed ratio between the driving motor and the front wheel end to obtain a sixth target torque of the driving motor; And controlling an actual torque of the driving motor based on the sixth target torque.
14. The control method of a hybrid vehicle according to any one of claims 7 to 13, characterized by controlling an actual rotation speed of the engine so that a rotation speed difference between a drive end and a driven end of the electromagnetic one-way clutch is less than or equal to the second rotation speed difference threshold value, comprising: determining a candidate target rotational speed of the engine based on an actual rotational speed of the drive motor, the first rotational speed ratio, and the second rotational speed difference threshold; determining the smaller of the candidate target rotational speed and the target rotational speed of the engine in the series mode as a second target rotational speed of the engine; An actual rotational speed of the engine is controlled based on the second target rotational speed.
15. A control device of a hybrid vehicle comprising a processor and a memory, characterized in that the memory stores computer program instructions executable by the processor, which processor, when executing the computer program instructions, carries out the steps of the method according to any one of claims 1 to 14.

Description

Control method and equipment for hybrid vehicle Technical Field The application belongs to the technical field of vehicle control, and particularly relates to a control method and equipment for a hybrid vehicle. Background The electromagnetic one-way clutch realizes the combination and separation of the driving end and the driven end by changing the position of the roller in the wedge-shaped groove. In a hybrid vehicle, when the driving end and the driven end of an electromagnetic one-way clutch are separated, a range extender consisting of an engine and a generator generates electricity and supplies energy to a driving motor, and then the vehicle is driven by the driving motor, which is called a series mode, and when the driving end and the driven end of the clutch are combined, the engine can drive the vehicle alone or together with the driving motor, which is called a parallel mode. When the hybrid vehicle is switched from the series mode to the parallel mode, the roller of the electromagnetic one-way clutch is likely to be unable to be pushed to the end with the narrower wedge-shaped groove, and the combination is unable to be successfully performed. Based on this, how to improve the engagement success rate of the electromagnetic one-way clutch in the hybrid vehicle is a problem that needs to be solved in the art. Disclosure of Invention The embodiment of the application provides a control method and control equipment for a hybrid vehicle, which can further avoid that a roller cannot be pushed to one end with a narrower wedge-shaped groove due to overlarge centrifugal force caused by overlarge rotating speed of a driving end of an electromagnetic one-way clutch to at least a certain extent, and further improve the success rate of combination of the driving end and a driven end of the electromagnetic one-way clutch. Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application. According to a first aspect of the embodiment of the application, a control method of a hybrid vehicle is provided, the hybrid vehicle comprises a hybrid system, the hybrid system comprises an electromagnetic one-way clutch, an engine, a generator and a driving motor, a driving end of the electromagnetic one-way clutch is connected with the engine, a driven end of the electromagnetic one-way clutch is connected with the driving motor, the engine is further connected with the generator, if a condition that a parallel mode is switched from a serial mode to a parallel mode is detected, a first target rotating speed of the engine is determined according to an actual rotating speed of the driving motor, a first rotating speed ratio between the driving motor and the engine and a first rotating speed difference threshold value, after the first target rotating speed of the engine is larger than a preset rotating speed threshold value, the electromagnetic one-way clutch is controlled to be electrified, after the electromagnetic one-way clutch is electrified, the actual rotating speed of the engine is controlled to reach the first target rotating speed, and after the actual rotating speed of the engine reaches the first target rotating speed, the absolute value of the torque of the generator is controlled to be reduced to zero, so that the working mode of the hybrid system is switched from the serial mode to the parallel mode. In some embodiments, controlling the absolute value of the torque of the generator to decrease to zero comprises: Determining a torque slope of the generator based on a rotational speed difference between the driving end and the driven end of the electromagnetic one-way clutch and a resultant torque of the driving end of the electromagnetic one-way clutch; The absolute value of the torque of the generator is controlled to gradually decrease based on the torque slope until the absolute value of the torque of the generator decreases to zero. In some embodiments, determining the torque slope of the generator based on the rotational speed difference between the driving and the driven ends of the electromagnetic one-way clutch and the resultant torque of the driving end of the electromagnetic one-way clutch includes: if the rotation speed difference is smaller than zero and the combined torque of the driving end of the electromagnetic one-way clutch is smaller than the preset torque, determining the torque slope of the generator as a first slope, wherein the first slope is larger than zero; And if the rotation speed difference is equal to zero, determining the torque slope of the generator as a second slope, wherein the second slope is larger than the first slope. In some embodiments, determining the torque slope of the generator based on the rotational speed difference between the driving and the driven ends of the electromagnetic one-way clutch and the resultant torque of the driving end of the electromagnetic one-way clutch