A torque recovery control method and control system for a pure electric vehicle

Abstract

The invention discloses a torque recycling control method and control system of a pure electric vehicle. The method comprises the steps of calculating a current recyclable target torque according to current driving parameters of the vehicle, obtaining a current actual request torque, and presetting a biggest reclaimed torque not causing locking of the vehicle; when the anti-lock braking system ABS of the vehicle is activated and the brake pedal of the vehicle is not stepped on, determining to conduct filtering according to a fast filtering gradient or a regular filtering gradient based on the absolute value of the current recyclable target torque and the absolute value of the biggest reclaimed standardization torque. According to the torque recycling control method and control system of the pure electric vehicle, the vehicle can achieve steady transition before and after the interference of the ABS interference by controlling different filtering gradients, and it is guaranteed that the vehicle is provided with the corresponding reclaimed torque and meanwhile locking of vehicle wheels is not caused when the vehicle slides on a low attachment coefficient road; meanwhile, by setting the reset condition of a control state, the repeating interference of the ABS in the same reclaimed interval is avoided, and the problem of vehicle crowding is solved.

Description

technical field [0001] The present invention relates to the technical field of electronic control of electric vehicles, and more specifically, relates to a torque recovery control method and control system for pure electric vehicles. Background technique [0002] In recent years, pure electric vehicles have developed rapidly, but a major problem they still face is that the driving range is too short. In order to solve this problem, various OEMs have conducted a lot of research on battery power, motor efficiency, energy recovery, etc., and achieved certain results. In terms of energy recovery control, in order to recover more kinetic energy when the vehicle is coasting and braking, the current common practice is to calculate a limit energy recovery torque based on the charging capacity of the battery and the current recovery torque of the motor. When the vehicle is in the braking process, for example: the brake pedal is stepped on, there is a corresponding recovery torque at...

AI Technical Summary

Problems solved by technology

Using "immediately cancel recovery torque" under such working conditions will lead to figure 1 Phenomenon: First, after the ABS is activated, the motor torque directly drops to 0, and coasting recovery cannot be realized; second, the ABS intervenes in the control, and the ABS will exit after the front wheel lock is improved. At this time, the vehicle will resume the recovery torque, and the ABS will It will intervene again, causing the motor torque to fluctuate repeatedly, which is manifested in the driving experience of the vehicle as the vehicle moves forward and backward.

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