Control method for torque output during parking and starting, motor controller and automobile

Abstract

The invention provides a control method for torque output during parking and starting, a motor controller and an automobile. The control method comprises the steps of in a parking state, when a signal that an accelerator pedal is treaded is received, controlling a motor to output torque according to an initial torque change rate; determining a target gradient according to the obtained current output torque, the longitudinal acceleration signal and the current parking state information; when the current output torque reaches the target starting torque value, initiating a slow gradient output stage with the slow gradient torque change rate smaller than the initial torque change rate, and in the slow gradient output stage, switching the EPB from the locking state to the unlocking state; and the target starting torque value and the slow gradient torque change rate being determined according to the target gradient. The rising speed of the output torque of the motor is slow when braking is released, brake millstone sound caused by counterbalance of the motor and the EPB is avoided, and the safety and comfort of vehicle starting are guaranteed.

Description

technical field [0001] The invention relates to the field of dynamic control of electric vehicles, in particular to a control method for torque output when parking and starting, a motor controller and a vehicle. Background technique [0002] When the vehicle is in a parked state, the Electronic Park Brake (EPB) is in a locked state. If the driver depresses the accelerator pedal at this time, the vehicle with the EPB automatic release function will automatically release, but due to The torque of the motor increases rapidly and the release time of the EPB is too long. When starting, there will be a phenomenon of competition between the motor and the EPB, resulting in the sound of brake grinding at the moment of starting, which affects the user experience. Moreover, the slope when the vehicle starts is greatly affected by the change of the body posture, so that the accuracy of the dynamic slope is not high when starting, which in turn will affect the torque matching effect when...

AI Technical Summary

Problems solved by technology

[0003] The technical purpose to be achieved by the embodiments of the present invention is to provide a control method for torque output when parking and starting, a motor controller and an automobile, to solve the problem of the motor torque increasing rapidly and the EPB when the current vehicle is parking and starting. Issues with brake grinding sound caused by excessively long release times

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