EP-4741243-A1 - CONTROL METHOD FOR DUAL-MOTOR HYBRID SYSTEM OF HYBRID VEHICLE, AND APPARATUS

Abstract

A control method for a dual-motor hybrid system of a hybrid vehicle, including: when the dual-motor hybrid system is in a parallel mode, obtaining an input shaft request torque requested to be output by an input shaft of a transmission (5) and a first motor request torque requested to be output by a first motor (2); and in response to the input shaft request torque being greater than a torque capability of a clutch (4), and a difference between the input shaft request torque and the torque capability of the clutch (4) being less than a speed regulation intervention torque capability of the input shaft, controlling the first motor (2) to output a sum of the first motor request torque and an intervention negative torque, and controlling an engine (1) to output an engine torque; where an absolute value of the intervention negative torque is less than or equal to the difference between the input shaft request torque and the torque capability of the clutch (4); the engine torque is a positive torque equal to a difference between the torque capability of the clutch (4) and the intervention negative torque; and the torque capability of the clutch (4) is a maximum torque that the clutch is capable of transmitting. The method can quickly increase a speed of the input shaft of the transmission. An apparatus for a dual-motor hybrid system of a hybrid vehicle is further disclosed.

Inventors

• JING, Junchao
• LIU, YIQIANG
• HUANG, Weishan
• ZUO, Botao
• YANG, Guikang

Assignees

• Aurobay (Ningbo) Intelligent Technology Co., Ltd.
• Aurobay (Yiwu) Drive Systems Co., Ltd.
• Aurobay Technology Co., Ltd

Dates

Publication Date

20260513

Application Date

20240206

Claims (16)

1. A control method for a dual-motor hybrid system of a hybrid vehicle, the dual-motor hybrid system comprising an engine, a first motor, a second motor, a transmission, and a clutch, wherein the first motor is drivably connected to the engine, an input shaft of the transmission is connected to the engine, the first motor, and the second motor, and the clutch is connected to the second motor and the first motor, respectively; the method comprising: in response to determining that the dual-motor hybrid system is in a parallel mode, obtaining an input shaft request torque and a first motor request torque; and in response to the input shaft request torque being greater than a torque capability of the clutch, and a difference between the input shaft request torque and the torque capability of the clutch being less than a speed regulation intervention torque capability of the input shaft, controlling the first motor to output a sum of the first motor request torque and an intervention negative torque, and controlling the engine to output an engine torque; wherein an absolute value of the intervention negative torque is less than or equal to the difference between the input shaft request torque and the torque capability of the clutch; the engine torque is a positive torque equal to a difference between the torque capability of the clutch and the intervention negative torque; and the torque capability of the clutch is a maximum torque that the clutch is capable of transmitting.
2. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 1, wherein controlling the first motor to output the sum of the first motor request torque and the intervention negative torque, and controlling the engine to output the engine torque comprises: controlling the first motor to output a sum of the first motor request torque and a maximum intervention negative torque that the first motor is capable of outputting; the engine torque being equal to a difference between the torque capability of the clutch and the maximum intervention negative torque.
3. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 2, wherein after controlling the engine to output the engine torque, the method comprises: in response to a sum of the engine torque output by the engine and the maximum intervention negative torque being less than the input shaft request torque, controlling the second motor to output a second motor torque, wherein a sum of the second motor torque, the engine torque, and the maximum intervention negative torque that the first motor is capable of outputting is equal to the input shaft request torque.
4. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 1, further comprising: in response to a speed request in a power-on upshift mode of the hybrid vehicle, obtaining a second motor request torque, and determining a speed regulation intervention torque of the input shaft according to the speed request; and in response to the speed regulation intervention torque being less than or equal to a speed regulation intervention torque capability of the second motor, controlling the second motor to output a sum of the speed regulation intervention torque and the second motor request torque.
5. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 4, comprising: in response to the speed regulation intervention torque being greater than the speed regulation intervention torque capability of the second motor and less than or equal to the speed regulation intervention torque capability of the input shaft, controlling the second motor to output a sum of the speed regulation intervention torque capability of the second motor and the second motor request torque, and controlling the first motor and/or the engine to output a remaining intervention torque, wherein the remaining intervention torque is a difference between the speed regulation intervention torque and the speed regulation intervention torque capability of the second motor.
6. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 5, wherein the hybrid vehicle comprises a battery, the first motor is electrically connected to the battery, and controlling the first motor and/or the engine to output the remaining intervention torque comprises: obtaining a negative power capacity of the battery; and in response to the negative power capacity being less than or equal to a negative power capacity threshold, controlling the first motor to output a first motor intervention torque; the first motor intervention torque being less than or equal to the remaining intervention torque, and the first motor intervention torque being a positive torque or a negative torque.
7. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 6, wherein controlling the first motor and/or the engine to output the remaining intervention torque comprises: in response to the negative power capacity being less than or equal to the negative power capacity threshold and the remaining intervention torque being less than or equal to a speed regulation intervention torque capability of the first motor, controlling the first motor to output the first motor intervention torque, wherein the first motor intervention torque is equal to the remaining intervention torque.
8. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 6, wherein controlling the first motor and/or the engine to output the remaining intervention torque comprises: in response to the negative power capacity being less than or equal to the negative power capacity threshold, and the remaining intervention torque being greater than a speed regulation intervention torque capability of the first motor, controlling the first motor to output the speed regulation intervention torque capability of the first motor, and controlling the engine to output an engine intervention torque, wherein the engine intervention torque is equal to a difference between the remaining intervention torque and the speed regulation intervention torque capability of the first motor.
9. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 6, after obtaining the negative power capacity of the battery, the method further comprises: in response to the negative power capacity being greater than the negative power capacity threshold, reducing a torque output by the first motor within a positive torque range.
10. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 9, after obtaining the negative power capacity of the battery, the method further comprises: in response to the negative power capacity being greater than the negative power capacity threshold and a positive torque output by the first motor being less than the remaining intervention torque, controlling the engine to output an engine intervention torque, wherein the engine intervention torque is equal to a difference between the remaining intervention torque and the positive torque output by the first motor.
11. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 6, wherein the clutch comprises a shift clutch, which is engaged in the power-on upshift mode of the hybrid vehicle; and the method further comprises: in response to the speed regulation intervention torque being greater than the speed regulation intervention torque capability of the input shaft, controlling the second motor to output the sum of the speed regulation intervention torque capability of the second motor and the second motor request torque, controlling the engine to output a speed regulation intervention torque capability of the engine, controlling the first motor according to the negative power capacity of the battery, and controlling the shift clutch to output a torque according to a difference between the speed regulation intervention torque and the speed regulation intervention torque capability of the input shaft.
12. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 11, wherein controlling the shift clutch to output the torque according to the difference between the speed regulation intervention torque and the speed regulation intervention torque capability of the input shaft comprises: determining a regulation torque according to the series/parallel mode of the dual-motor hybrid system, a gear-shifting mode, a gear, a target speed change rate of the input shaft, and an actual speed change rate of the input shaft; determining an output torque of the shift clutch according to the difference between the speed regulation intervention torque and the speed regulation intervention torque capability of the input shaft, a feedforward torque of the shift clutch, and the regulation torque; and controlling the shift clutch to output the output torque.
13. The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 1, wherein the speed regulation intervention torque capability of the input shaft is a sum of a speed regulation intervention torque capability of the first motor, a speed regulation intervention torque capability of the second motor, and a speed regulation intervention torque capability of the engine.
14. A computer-readable storage medium, comprising one or more processors for performing the control method for the dual-motor hybrid system of the hybrid vehicle according to any one of claims 1 to 13.
15. A control apparatus for a dual-motor hybrid system of a hybrid vehicle, comprising one or more processors for performing the control method for the dual-motor hybrid system of the hybrid vehicle according to any one of claims 1 to 13.
16. A hybrid vehicle, comprising: a dual-motor hybrid system, comprising an engine, a first motor, a second motor, a transmission, and a clutch, wherein the first motor is drivably connected to the engine, an input shaft of the transmission is connected to the engine, the first motor, and the second motor, and the clutch is connected to the second motor and the first motor, respectively; and the control apparatus for the dual-motor hybrid system of the hybrid vehicle according to claim 15, which is electrically connected to the dual-motor hybrid system.

Description

TECHNICAL FIELD The present disclosure relates to the field of vehicle control technologies, and in particular, to a control method and apparatus for a dual-motor hybrid system of a hybrid vehicle. BACKGROUND Currently, some hybrid vehicles are equipped with a dual-motor hybrid system. Control of an output torque of the dual-motor hybrid system may affect the power performance and drivability of the entire vehicle. A clutch of the dual-motor hybrid system is connected between two motors. The dual-motor hybrid system includes a series mode and a parallel mode. When the hybrid vehicle operates in the parallel mode, and if an input shaft request torque of a transmission is greater than a torque capability of the clutch, it is necessary to perform torque intervention control on the dual-motor hybrid system without exceeding the torque capability of the clutch. SUMMARY The present disclosure provides a control method and apparatus for a dual-motor hybrid system of a hybrid vehicle. The present disclosure provides a control method for a dual-motor hybrid system of a hybrid vehicle, the dual-motor hybrid system including an engine, a first motor, a second motor, a transmission, and a clutch, where the first motor is drivably connected to the engine, an input shaft of the transmission is connected to the engine, the first motor, and the second motor, and the clutch is connected to the second motor and the first motor, respectively; the method including: in response to determining that the dual-motor hybrid system is in a parallel mode, obtaining an input shaft request torque and a first motor request torque; andin response to the input shaft request torque being greater than a torque capability of the clutch, and a difference between the input shaft request torque and the torque capability of the clutch being less than a speed regulation intervention torque capability of the input shaft, controlling the first motor to output a sum of the first motor request torque and an intervention negative torque, and controlling the engine to output an engine torque; where an absolute value of the intervention negative torque is less than or equal to the difference between the input shaft request torque and the torque capability of the clutch; the engine torque is a positive torque equal to a difference between the torque capability of the clutch and the intervention negative torque; and the torque capability of the clutch is a maximum torque that the clutch is capable of transmitting. Optionally, controlling the first motor to output the sum of the first motor request torque and the intervention negative torque, and controlling the engine to output the engine torque includes: controlling the first motor to output a sum of the first motor request torque and a maximum intervention negative torque that the first motor is capable of outputting; the engine torque being equal to a difference between the torque capability of the clutch and the maximum intervention negative torque. Optionally, after controlling the engine to output the engine torque, the method includes: in response to a sum of the engine torque output by the engine and the maximum intervention negative torque being less than the input shaft request torque, controlling the second motor to output a second motor torque, where a sum of the second motor torque, the engine torque, and the maximum intervention negative torque that the first motor is capable of outputting is equal to the input shaft request torque. Optionally, the method further includes: in response to a speed request in a power-on upshift mode of the hybrid vehicle, obtaining a second motor request torque, and determining a speed regulation intervention torque of the input shaft according to the speed request; andin response to the speed regulation intervention torque being less than or equal to a speed regulation intervention torque capability of the second motor, controlling the second motor to output a sum of the speed regulation intervention torque and the second motor request torque. Optionally, the method includes: in response to the speed regulation intervention torque being greater than the speed regulation intervention torque capability of the second motor and less than or equal to the speed regulation intervention torque capability of the input shaft, controlling the second motor to output a sum of the speed regulation intervention torque capability of the second motor and the second motor request torque, and controlling the first motor and/or the engine to output a remaining intervention torque, where the remaining intervention torque is a difference between the speed regulation intervention torque and the speed regulation intervention torque capability of the second motor. Optionally, the hybrid vehicle includes a battery, the first motor is electrically connected to the battery, and controlling the first motor and/or the engine to output the remaining intervention torque includes: obtaining a