Extended range electric vehicle energy management control method based on intelligent optimization

Abstract

The invention discloses an extended range electric vehicle energy management control method based on multi-objective optimization, which comprises the following steps of: establishing a multi-working-point energy control strategy: respectively selecting a working point when an engine is in a light load, a medium load and a high load, and respectively setting engine output powers corresponding to the three working points as P1, P2 and P3; setting two battery SOC trigger points and two vehicle speed trigger points, switching working points of an engine according to different power battery SOC values and the current vehicle speed value, and performing energy distribution on the whole vehicle under different loads; performing multi-objective optimization on the output power of the working point of the engine by adopting a genetic algorithm of non-dominated sorting with an elitist strategy; introducing the optimized working point parameters into an original multi-working-point control strategy, and the purpose of better fuel oil and emission performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of new energy vehicles, and in particular relates to an energy management control method for an extended-range electric vehicle. Background technique [0002] In recent years, countries around the world have vigorously developed new energy vehicles in order to reduce the impact of air pollution and the greenhouse effect on the environment. Among them, the pure electric vehicle is affected by the low energy density of its power battery, high cost and short driving range, so it is currently being hindered in the process of promotion. However, the range-extended electric vehicle, because of its small power battery, low cost, and considerable driving range, is currently a research hotspot for new energy vehicles. [0003] The core components of the power system of an extended-range electric vehicle include an auxiliary power unit (APU), a power battery system, a drive motor and its control system, and a thermal...

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Problems solved by technology

[0005] In order to solve the problems of power battery life attenuation and low engine efficiency in the existing control technology of range-extended electric vehicles, the present invention provides an energy management control method for range-extended electric vehicles based on multi-objective optimization. On the basis of the multi-point control strategy, the multi-objective optimization method is applied to optimize the output power of the set engine operating point, and the optimized operating point parameters are brought into the original multi-operating point control strategy. The purpose of better fuel and emission performance can improve the fuel economy and emission performance of extended-range electric vehicles, and improve urban air quality to a certain extent

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