EP-4741242-A1 - HYBRID ELECTRIC VEHICLE, AND CONTROL METHOD AND APPARATUS FOR DUAL-ELECTRIC-MOTOR HYBRID SYSTEM OF HYBRID ELECTRIC VEHICLE

EP4741242A1EP 4741242 A1EP4741242 A1EP 4741242A1EP-4741242-A1

Abstract

A hybrid vehicle and a control method and apparatus for a dual-motor hybrid system thereof. The dual-motor hybrid system includes an engine, a first motor, a second motor, a transmission, and a mode switching clutch. The first motor is connected to the engine, an input shaft of the transmission is connected to the engine, the first motor, and the second motor, and the mode switching clutch is connected to the second motor and the first motor, respectively. The method includes: in response to a speed request in a power-on upshift mode of the hybrid vehicle, obtaining a second motor request torque requested to be output by the second motor, and determining a speed regulation intervention torque of the input shaft; and if the speed regulation intervention torque is 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.

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: 20240108

Claims (11)

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 mode switching 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 mode switching clutch is connected to the second motor and the first motor, respectively, the method comprising: in response to a speed request in a power-on upshift mode of the hybrid vehicle, obtaining a second motor request torque requested to be output by the second motor, and determining a speed regulation intervention torque of the input shaft; and in response to determining that the speed regulation intervention torque is 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.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 1, further comprising: in response to determining that the speed regulation intervention torque is greater than the speed regulation intervention torque capability of the second motor and less than or equal to a 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, the remaining intervention torque being a difference between the speed regulation intervention torque and the speed regulation intervention torque capability of the second motor.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 2, 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 determining that the negative power capacity is not greater than a negative power capacity threshold, controlling at least 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.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 3, wherein controlling the first motor and/or the engine to output the remaining intervention torque comprises: in response to determining that the negative power capacity is not greater than the negative power capacity threshold, and the remaining intervention torque is 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, the first motor intervention torque being equal to the remaining intervention torque; and in response to determining that the negative power capacity is not greater than the negative power capacity threshold, and the remaining intervention torque is greater than the 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, the engine intervention torque being equal to a difference between the remaining intervention torque and the speed regulation intervention torque capability of the first motor.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 3, further comprising: in response to determining that the negative power capacity is greater than the negative power capacity threshold, reducing a torque output by the first motor within a positive torque range.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 5, further comprising: in response to determining that the negative power capacity is greater than the negative power capacity threshold and a positive torque output by the first motor is less than the remaining intervention torque, controlling the engine to output an engine intervention torque, the engine intervention torque being equal to a difference between the remaining intervention torque and the positive torque output by the first motor.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 3, wherein the hybrid vehicle comprises a shift clutch, and the shift clutch is engaged in the power-on upshift mode of the hybrid vehicle; and the method further comprises: in response to determining that the speed regulation intervention torque is 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.
The control method for the dual-motor hybrid system of the hybrid vehicle according to claim 7, 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 a 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.
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 8.
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 8.
A hybrid vehicle, comprising: a dual-motor hybrid system comprising an engine, a first motor, a second motor, a transmission, and a mode switching clutch, the first motor being drivably connected to the engine, an input shaft of the transmission being connected to the engine, the first motor, and the second motor, and the mode switching clutch being 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 10, 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 hybrid vehicle and a control method and apparatus for a dual-motor hybrid system thereof. BACKGROUND Currently, some hybrid vehicles are equipped with a dual-motor hybrid system. Control of a gear-shifting process of the dual-motor hybrid system may affect the power performance and drivability of the entire vehicle. SUMMARY The present disclosure provides a hybrid vehicle and a control method and apparatus for a dual-motor hybrid system thereof. 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 mode switching 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 mode switching clutch is connected to the second motor and the first motor, respectively; the method including: in response to a speed request in a power-on upshift mode of the hybrid vehicle, obtaining a second motor request torque requested to be output by the second motor, and determining a speed regulation intervention torque of the input shaft; andin response to determining that the speed regulation intervention torque is 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 further includes: in response to determining that the speed regulation intervention torque is greater than the speed regulation intervention torque capability of the second motor and less than or equal to a 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 negative power capacity of the battery;in response to determining that the negative power capacity is not greater than a negative power capacity threshold, controlling at least the first motor to output a first motor intervention torque; where the first motor intervention torque is less than or equal to the remaining intervention torque, and the first motor intervention torque is a positive torque or a negative torque. Optionally, controlling the first motor and/or the engine to output the remaining intervention torque includes: in response to determining that the negative power capacity is not greater than the negative power capacity threshold, and the remaining intervention torque is 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, where the first motor intervention torque is equal to the remaining intervention torque; andin response to determining that the negative power capacity is not greater than the negative power capacity threshold and the remaining intervention torque is greater than the 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, where 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. Optionally, the method further includes: in response to determining that the negative power capacity is greater than the negative power capacity threshold, reducing a torque output by the first motor within a positive torque range. Optionally, the method further includes: in response to determining that the negative power capacity is greater than the negative power capacity threshold and a positive torque output by the first motor is less than the remaining intervention torque, controlling the engine to output an engine intervention torque, where the engine intervention torque is equal to a difference between the remaining intervention torque and the positive torque output by the first motor. Optionally, the hybrid vehicle includes a shift clutch, and the shift clutch is engaged in the power-on upshift mode of the hybrid vehicle; and the method further includes: i