An electric vehicle braking energy recovery system

Abstract

The invention discloses a brake energy recovery system for an electric vehicle, which comprises a hydraulic brake assembly, a brake energy recovery assembly, a vehicle controller, a brake controller and a vehicle speed sensor. The present invention arranges brake motors on both the front and rear wheels to maximize the braking energy and at the same time adjust the braking strength of the brake motors, especially for braking on road surfaces with low adhesion coefficients, so as to reasonably adjust and distribute braking The braking strength of the motor is conducive to optimizing the braking energy recovery rate and improving the braking stability of the car.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of new energy vehicles, and in particular relates to a braking energy recovery system for electric vehicles. Background technique [0002] Braking Energy Recovery System (BERS) is an important part of modern automotive technology, especially for electric vehicles, because the large-capacity batteries suitable for electric vehicles have not yet achieved a key technological breakthrough, at this time, braking The energy recovery system is the most important supplementary source of battery power. In the urban road environment, the energy consumed by the car in the form of heat energy in the braking process can account for up to 50% of the total driving energy. Through the braking energy recovery system, each time the car is fully charged, its mileage can be increased by as much as 10% to 30%. Governments of various countries have invested a lot of energy in this technology, and great...

AI Technical Summary

Problems solved by technology

However, the braking energy recovery is limited by the mechanical braking system, and the recovered energy is limited, and the regenerative braking will affect the comfort and smoothness of the driver's braking when the vehicle is braking.

However, because of its simplicity and practicality, it is still the strategy chosen by many electric vehicles even though the energy recovery rate is not high.

The third control strategy is the optimal energy recovery control strategy. This strategy is aimed at maximizing braking energy recovery, and the stability of the vehicle during braking is discarded to a certain extent.

Compared with the previous two control strategies, this control strategy has the highest energy recovery rate, but the stability is not good, and the driving wheel lock is prone to occur on roads with low adhesion coefficient

Because it is necessary to coordinate the control of the motor braking torque and the mechanical braking torque, the control is more complicated, and the requirements for hardware modification are high, so this strategy is rarely used in the actual products of electric vehicles.

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