A braking energy feedback control circuit and power distribution method

Abstract

The invention relates to a brake energy feedback control circuit and a power distribution method. By comparing the maximum charging power of the energy storage device and the electric braking power ofthe main motor when braking the vehicle, the required power of the braking resistor is allocated according to the electric braking power of the motor and the maximum charging power allowed by the battery. The invention can maintain the consistency of the electric braking force when the battery charging ability is weak or the battery temperature is low, appropriately improve the power of the current vehicle to the braking resistor, and reduce the charging current of the power battery in order to prevent over-charge and over-discharge of the power battery, effectively solving the problem that the electric braking force becomes smaller, the braking distance increases, and the braking is unstable when the driver steps on the brake pedal.

Description

technical field [0001] The invention belongs to the field of pure electric and hybrid electric vehicles, and in particular relates to a braking energy feedback control circuit and a power distribution method. Background technique [0002] Braking energy feedback is one of the key technologies for pure electric vehicles and hybrid vehicles to reduce fuel consumption. The current braking energy feedback control method simply superimposes the motor braking force and mechanical braking force, but the motor braking is limited by the battery capacity. limit. When the battery power is low, the battery can absorb the braking feedback energy, and the motor can brake, and the total braking force is the motor braking force plus the mechanical braking force; when the battery power is sufficient, the battery can no longer absorb the braking feedback energy. If the energy is low, the motor cannot perform braking, and the total braking force is only the mechanical braking force. [0003]...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a braking energy feedback control circuit and a power distribution method, which are used to solve the problem of electric braking force change when the driver steps on the brake pedal when the SOC of the power battery is high or the temperature of the battery is low during the braking process. Problems with small, increased braking distance, and unstable braking

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