A method for energy management and control of an extended-range electric vehicle

Abstract

The invention discloses an energy management control method for an extended-range electric vehicle, which comprises the following steps: according to the power demand of the whole vehicle and referring to the universal characteristic curve of the engine, selecting a working point when the engine is under light, medium and high load. , and define the selected three operating points as operating point 1, operating point 2, and operating point 3 of the range extender respectively. The engine output power corresponding to the three operating points is P1, P2, and P3; according to the performance of the power battery , set two battery SOC trigger points, namely SOC_high and SOC_low; according to the vehicle dynamic performance, set two vehicle speed trigger points, namely V_high and V_low; according to different power battery SOC values ​​and current vehicle speed values, and so The battery SOC trigger point and the vehicle speed trigger point selected in step S2 are used as a reference, and combined with the accelerator pedal state and road gradient information, the operating point of the engine is switched, and the energy is distributed to the 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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