Extended-range electric vehicle energy management control method

Abstract

The invention discloses an extended-range electric vehicle energy management control method which comprises the following steps: according to the power requirement of a whole vehicle, referring to a universal characteristic curve graph of an engine, respectively selecting a working point when the engine is in light, medium and high loads, and respectively defining the selected three working pointsas a working point 1, a working point 2 and a working point 3 of a range extender, wherein the engine output powers corresponding to the three working points are P1, P2 and P3; according to the performance of the power battery, setting two battery SOC trigger points, namely SOC_high and SOC_low; setting two vehicle speed triggering points, namely Vhigh and Vlow, according to the power performanceof the whole vehicle; and S3, according to different power battery SOC values and current vehicle speed values, taking the battery SOC trigger point and the vehicle speed trigger point selected in the step S2 as references, combining the accelerator pedal state and road slope information, switching working points of an engine, and carrying out energy distribution on the whole vehicle under different loads.

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 greenhouse effect and air pollution on the environment. Among them, the pure electric vehicle is affected by its short driving range, low power battery energy density and high cost, and is currently being hindered in the promotion process. However, compared with pure electric vehicles, extended-range electric vehicles have become a research hotspot of new energy vehicles because of their smaller power batteries, lower cost, and considerable driving range. [0003] The energy management and control technology of range-extended electric vehicles is one of its core research contents. At present, there are many studies on energy contr...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides an energy management control method for an extended-range electric vehicle, which properly avoids the problems of power battery life attenuation and low engine efficiency in the existing control technology of the extended-range electric vehicle, thereby ensuring The service life of the battery improves the working efficiency of the range extender; further ensures the power performance of the range-extended electric vehicle, improves the fuel economy and emission performance of the vehicle, and improves the urban air quality to a certain extent

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