Pure electric vehicle dual-motor coupling driving device and hill-holding control method thereof

Abstract

The invention discloses a pure electric vehicle dual-motor coupling driving device and a hill-holding control method thereof. The pure electric vehicle dual-motor coupling driving device comprises a vehicle control unit, a first motor controller, a second motor controller, a main motor, an auxiliary motor, a first electromagnetic clutch, a second electromagnetic clutch, a planetary gear mechanism,a transmission shaft, a speed reducer and a differential mechanism. During work, when it is detected that the gradient is smaller than phi, the first motor controller controls the main motor to entera parking slope, the first electromagnetic clutch is closed, and the second electromagnetic clutch is disconnected; and when it is detected that the gradient is larger than or equal to phi, the torque M0 of the auxiliary motor is directly requested, the first motor controller calculates the torque needing to be output by the main motor according to the torque needed for achieving slope parking and the torque M0 provided by the auxiliary motor, and the first electromagnetic clutch and the second electromagnetic clutch are closed at the same time. The device can be used for the dual-motor electric automobile, and the motor utilization rate is effectively increased while a problem that an existing dual-motor electric automobile is parked on a slope under a large slope is solved.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to a dual-motor coupling drive device for a pure electric automobile and a standing slope control method thereof. Background technique [0002] Pure electric vehicle vehicle controller (vehicle controller) is the core control component of new energy vehicles, and the level of vehicle controller control technology directly affects the power, safety and economy of the vehicle. According to the system design requirements, the vehicle controller needs to participate in the control of the main functions of the vehicle, such as power on and off control, system working mode management, torque calculation, energy recovery, shift strategy, fault diagnosis and processing, etc. Among them, the parking slope control system scheme of some OEMs is as follows: the vehicle controller judges whether it is necessary to enter the parking slope according to the change of the motor speed and ...

AI Technical Summary

Problems solved by technology

Its novelty is that it can realize the parking function of electric vehicles without accelerator and brake pedals, but similarly, its control logic can only be applied to single-motor electric vehicles

[0003] In addition, there are many studies on the dual-motor coupling drive form of pure electric vehicles. Among them, Chu Liang et al. proposed a dual-motor coupling system for electric vehicles (publication number CN103587396B), which has a main motor single-working mode and an auxiliary motor single-working mode , dual-motor torque coupling working mode and other working modes, which can meet the problem of motor distribution and utilization under different working conditions, and increase the load rate of the motor. There is still room for improvement; Li Junqiu proposed a dual-motor speed-torque coupling drive assembly (publication number CN102133854A), which can realize large-scale non-power interruption torque and stepless transmission of the transmission system, and improves the dual-motor electric drive assembly. The smoothness during the shifting process of the car improves the utilization rate of the motor, but the device is too complicated and increases the load of the car

[0004] However, the current standing slope control technology can only solve the standing slope problem of single-motor pure electric vehicles. For dual-motor pure electric vehicles, there are still few standing slope control solutions.

Images