A vehicle sliding feedback control system and control method thereof

Abstract

A sliding feedback control method of a vehicle, the motor controller compares the maximum feedback torque value of the power battery, the maximum feedback torque value of the motor controller and the maximum feedback torque value of the motor, and sets the minimum value as the first feedback torque value Torque value; the motor controller stores a preset coasting feedback torque curve, and the motor controller calculates the second torque value based on the current vehicle speed signal, current slope signal and current vehicle operating mode, compared with the coasting feedback torque curve. Feedback torque value; the comparison unit compares the first feedback torque value with the second feedback torque value, and sets the minimum value as the final feedback torque value of the motor; the motor performs coasting feedback according to the final feedback torque value. The resulting final feedback torque value of the motor is more accurate, which improves the efficiency of the vehicle's sliding feedback and takes into account the smoothness of the vehicle.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a vehicle sliding feedback control system and a control method thereof. Background technique [0002] Electric vehicles use power batteries as the power source. How to fully improve the energy efficiency of electric vehicles to extend the driving range of vehicles is a key problem that electric vehicles need to solve. Energy feedback is an effective measure to solve this problem. [0003] Energy feedback includes vehicle braking feedback and coasting feedback. In the vehicle's coasting feedback control, the motor controller controls the motor to give feedback according to the calculated feedback torque value, thereby charging the power battery, increasing the driving range of the vehicle, and reducing the emission of pollutants. Wear from emissions and mechanical braking. [0004] The patent application with the publication number CN102490722A discloses a method and system for recoverin...

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Problems solved by technology

[0005] The above method obtains the final feedback torque of the motor through calculation. Although it can effectively improve the efficiency of energy recovery during vehicle coasting, there are still some defects: the motor controller is used to drive the motor, so the current state of the motor controller directly affects the power output of the motor. It will also affect the feedback torque of the motor. The above method does not calculate the constrained feedback torque of the motor controller; in addition, the above method does not fully consider the current road conditions and the impact of the vehicle's working mode on the vehicle's sliding feedback, so it is calculated by the above method The final feedback torque of the motor obtained is not perfect, and it will still affect the efficiency of vehicle coasting feedback

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