Extended range electric vehicle energy management method on basis of fuzzy control

Abstract

The invention relates to an extended range electric vehicle energy management method on the basis of fuzzy control, which particularly comprises the following steps that: 1, a vehicle control unit acquires a storage battery SOC (State of Charge) and bus demand power data; 2, the vehicle control unit judges whether the storage battery SOC is less than or equal to 90 percent, the step 3 is executed if yes, and if no, a range extender is controlled to be switched off by a CAN (Controller Area Network) bus; 3, a fuzzy control module carries out fuzzification on the storage battery SOC and the bus demand power data according to a membership function; 4, fuzzy reasoning is carried out on the fuzzified data according to a set fuzzy rule and the membership function; 5, defuzzification is carried out on a reasoning result by utilizing a centroid method and output power distribution values of the range extender and a storage battery are output; and 6, the vehicle control unit sends the output power distribution values of the range extender and the storage battery to the range extender and the storage battery by the CAN bus. Compared with the prior art, the extended range electric vehicle energy management method has the advantages of strong adaptability, capability of promoting the whole vehicle performance and the like.

Description

technical field [0001] The invention relates to an electric vehicle control method, in particular to an energy management method for an extended-range electric vehicle based on fuzzy control. Background technique [0002] As a new type of hybrid electric vehicle, the extended-range electric vehicle is not only different from the traditional internal combustion engine vehicle, but also different from the common gasoline-electric hybrid vehicle. A range-extended electric vehicle is based on a pure electric vehicle, equipped with an additional power device - a range extender. Generally, low-power gasoline, diesel internal combustion engines or fuel cells are used as the range extender. Because of its small power, the weight and price are relatively low, which is conducive to the popularization and use of the device. Although the power of the range extender is small, it can greatly improve the cruising range of the vehicle. Therefore, in the case of a high-power battery, the ve...

AI Technical Summary

Problems solved by technology

Although this type of strategy is easy to implement, its control effect cannot be dynamically changed with the working conditions and vehicle status. The working power of the range extender is often limited to one or several fixed values, so it is difficult to obtain a global optimal control effect, so the economy of the vehicle cannot be optimized

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