Energy management system and method for electric automobile

Abstract

The invention relates to the field of energy management of electric automobiles, and provides an energy management method for an electric automobile, so that the running cost of the hybrid power electric automobile is lowered. Automobile speed information of the electric automobile is collected and analyzed, and the running working condition type of the electric automobile is identified through the average automobile speed Va or / and the highest automobile speed Vmax of the electric automobile; the corresponding Markov probability transition torque is selected according to the working condition type, so that the predicted automobile speed Vk+n of the electric automobile is obtained; and according to the predicted automobile speed Vk+n, control commands are sent to an auxiliary power unit (APU) controller and a composite power supply controller through a composite power supply control strategy optimized by the Bellman dynamic programming theory, so that the discharge power of an APU system and a composite power supply is equal to the required power PND of a driving motor, and the power consumption of the composite power supply is the minimum. The energy management method is used for managing energy of the composite power supply of the electric automobile, so that the number of use times of a super-capacitor is increased, the working time of the APU system is shortened, and the fuel economy of the electric automobile is improved.

Description

technical field [0001] The invention relates to the field of energy management of electric vehicles, in particular to an energy management system and management method of electric vehicles. Background technique [0002] With the increasingly serious urban air pollution, more and more attention has been paid to energy-saving and environmentally friendly electric vehicles, and they have gradually become the focus of the development of automobile companies. Although the existing pure electric vehicles can achieve zero emission of air pollutants during driving, the short driving range of pure electric vehicles and the long time spent charging power batteries seriously restrict the promotion of pure electric vehicles. [0003] In order to improve the mileage of electric vehicles and reduce pollution, a plug-in hybrid electric vehicle has been introduced on the market. During driving, when in a traffic jam, the plug-in hybrid electric vehicle can work in a pure electric mode, the...

AI Technical Summary

Problems solved by technology

However, the existing energy management system of plug-in hybrid electric vehicles cannot reasonably control the distribution of the discharge power of the battery and supercapacitor according to its driving conditions, which leads to the inefficiency of the composite power supply.

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