An energy distribution method for an electric vehicle hybrid energy storage system

Abstract

The invention belongs to the technical field of electric vehicles and particularly relates to an energy distribution method of an electric vehicle hybrid energy storage system. The total power required by a whole vehicle is calculated according to various information in the running process of the electric vehicle; according to the calculated total power required by the whole vehicle and a Pontryagin minimum principle, and optimal battery power and a target current value and other relevant parameters of corresponding DCDC converter are calculated; a torque required by a motor and the target current value of the DCDC converter are transmitted to a motor control unit and a DCDC control unit for corresponding control. The optimality of energy distribution between a battery and a super-capacitor can be ensured, the calculated optimal energy distribution result can be also rapidly output in real time, and the energy consumption minimization problem of the hybrid energy storage system and the service life prolonging problem of the battery are further solved. In addition, the energy distribution method is similarly applicable to the situation of distribution of recovered power between the battery and the super-capacitor during recovery and braking of the electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of electric vehicles, and in particular relates to an energy distribution method for a hybrid energy storage system of an electric vehicle. Background technique [0002] At present, most electric vehicles use batteries as a single source of power. However, the current battery performance is limited, and its own physical characteristics make it unable to output high peak power well and cope with frequent charging and discharging. This usually occurs in urban driving conditions with frequent acceleration and deceleration. To cope with this load for a long time, the service life of the battery will also be seriously affected. The hybrid energy storage system for electric vehicles, that is, the combination of batteries and supercapacitors, was born in response to the above problems. Although the power density of the battery is low, the energy density is high, and it can store a large amount of energy to power...

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Problems solved by technology

[0005] Based on the above situation, the present invention aims at the electric vehicle hybrid energy storage system, in order to solve the problem of minimizing the energy consumption of the hybrid energy storage system and prolonging the battery life, and provides a hybrid energy storage system for electric vehicles based on optimal control theory System Energy Distribution Method

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