Electric vehicle constant speed cruise deceleration control method and control system

Abstract

The invention discloses a control method and control system of electric vehicle constant speed cruising deceleration. The control method includes the steps of determining whether a deceleration request for an electric vehicle is processed, if so, determining target speed, controlling the electric vehicle to gradually decelerate, and carrying out closed loop control of vehicle speed; determining whether actual vehicle speed reaches the target speed, otherwise entering into the next step; outputting initial deceleration target torque, and controlling the initial deceleration target torque to gradually reduce until the initial deceleration target torque drops to zero; outputting recovery torque which is used as the target torque of the constant speed cruising deceleration control; outputtingthe target torque of conventional driving; and coordinately processing the recovery torque and the target torque of conventional driving, and obtaining the final target torque. Drive motor energy recovery control is introduced in this way, the requirements of vehicle deceleration and stability can be effectively met, at the same time, the energy recovery rate is increased, the energy consumption of the system is reduced, the braking deceleration is increased, and the vehicle driving mileage is effectively increased.

Description

technical field [0001] The invention relates to the technical field of vehicle power system control, and more specifically, to a constant-speed cruise deceleration control method and control system for an electric vehicle. Background technique [0002] At present, pure electric vehicles or hybrid vehicles are increasingly using vehicle assisted driving systems to reduce the driver's driving intensity and improve driving comfort. The cruise control system is one of the typical vehicle assisted driving systems. However, most of the cruise control systems and control methods currently applied to electric vehicles are simply transplanted from traditional vehicle cruise control systems to electric vehicles, without fully considering the configuration characteristics of the electric vehicle power system. Especially when the system performs constant speed cruise deceleration control, it only uses the decrease of the driving torque and the resistance between the vehicle and the grou...

AI Technical Summary

Problems solved by technology

However, most of the cruise control systems and control methods currently applied to electric vehicles are simply transplanted from traditional vehicle cruise control systems to electric vehicles, without fully considering the configuration characteristics of the electric vehicle power system.

Especially when the system performs constant speed cruise deceleration control, it only uses the decrease of the driving torque and the resistance between the vehicle and the ground to gradually reduce the actual driving speed of the vehicle, without considering the characteristics of the energy recovery of the drive motor, resulting in a relatively small deceleration of the vehicle, which cannot be well controlled. Meet the driver's deceleration needs; and do not fully reduce the energy consumption rate of the system to increase the mileage of the vehicle

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