Control method of maximum energy recovery when electric vehicle brakes

Abstract

The invention discloses a control method of the maximum energy recovery when an electric vehicle brakes and belongs to the technical field of electric vehicles. The control method is characterized by comprising the following steps that (1), a calculation decision module of a vehicle control unit calculates needed brake torque according to the current state of the vehicle and the current road state, and the obtained brake torque is analyzed and processed according to the following situations; (2), according to the analysis result, through the coordinated logic control over the brake torque according to the brake process, the control over the maximum energy recovery when the electric vehicle brakes is finished finally. According to the control method of the maximum energy recovery when the electric vehicle brakes, the utilization rate of recovered energy of the electric vehicle is improved to be 50% from 20%, the driving range is increased by 75%, and the safety performance is ensured when the electric vehicle brakes; the road state can be sensed dynamically, the brake requirement by a driver is met in real time, the brake torque is adjusted, the brake requirement of the vehicle is met, and safety is ensured.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, in particular to a control method for maximum energy recovery when the electric vehicle brakes. Background technique [0002] With the increasing number of automobiles worldwide, the problems of energy crisis, environmental pollution and traffic safety brought to the society are becoming more and more serious. As an effective means to alleviate the pressure on the environment and resources, electric vehicles have achieved great development in recent years. As one of the cores of electric vehicles, the regenerative braking technology with the motor as the carrier is the key to realize its energy saving. [0003] When determining the braking torque that can be provided by a motor braking system controlled by a motor controller (MCU, Motor Control Unit), many factors often need to be considered. The existing regenerative braking control method cannot guarantee the safety of vehicle braki...

AI Technical Summary

Problems solved by technology

The existing regenerative braking control method cannot meet the driver's braking demand while ensuring the safety of vehicle braking, resulting in a very low energy recovery rate for vehicle braking, and the maximum energy recovery rate is less than 20%.

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