A range extender start-stop control system and control method for a range extender electric vehicle

Abstract

The invention discloses a range extender start-stop control system and a control method for a range extender electric vehicle. The control system includes a control module, a vehicle speed acquisition module and a battery state acquisition module, as well as a pedal demand power determination module and a map navigation module. The acquisition module and the power maintenance point determination module; the control module is connected with the pedal demand power determination module, the vehicle speed acquisition module, the map navigation acquisition module, the battery state acquisition module, and the power maintenance point determination module, and the control module is based on the acquired pedal demand power W, vehicle speed V, map navigation information, battery SOC, battery discharge power W f and SOC sustain point SOC 0 Comprehensively judge the start and stop requirements of the range extender, and then control the start or stop of the range extender according to the start and stop status of the range extender. In the present invention, the start-stop control of the range extender is more reasonable, the energy waste of the whole vehicle can be avoided, and the driving experience can be improved.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle control, and in particular relates to a range extender start-stop control system and a control method for a range extender electric vehicle. Background technique [0002] With the increase of car ownership year by year, the problem of automobile emissions is becoming more and more serious, and at the same time, the oil resources are decreasing day by day, and new energy vehicles that are energy-saving and environmentally friendly have emerged as the times require. Slowness and other issues have been criticized by the public, so extended-range electric vehicles that take into account the advantages of both are gradually favored by the public. [0003] At present, the start-stop dimension of the range extender in general extended-range electric vehicles is relatively simple, and the range-extender start-stop control strategy in related technologies has the following problems: (1) Only the b...

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Problems solved by technology

[0003] At present, the start-stop dimension of the range extender of general range-extender electric vehicles is relatively single, and the start-stop control strategy of the range extender in related technologies has the following problems: (1) only considering the battery power and / or vehicle speed dimensions, and not fully considering the operation of the whole vehicle Working conditions, you can’t have a good NVH experience in the low speed section, and the brake coasting recovery condition may limit part of the energy recovery, resulting in a waste of vehicle energy; (2) does not consider the start-stop priority and Switching logic can easily cause the range extender to start and stop repeatedly; (3) The power maintenance point (ie SOC maintenance point) is fixed, without considering the ambient temperature, and the user cannot set it, resulting in poor user experience

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