Control method and system for driving mode switching of hybrid vehicle

Abstract

The invention provides a control method and system for driving mode switching of a hybrid vehicle. The control method comprises steps that the information of all to-be-passed road sections and the vehicle information in a navigation map are acquired, the target road section information comprises a target distance L between a starting point and an ending point in a target road section and the roadgradient information of the target road section, and the vehicle information comprises the vehicle speed information of the target road section; the current remaining available power SOCp of a batterypack of the vehicle at a starting point of the target road section and the target remaining available power SOCt of the battery pack at a terminal point of the target road section are obtained; according to the SOCp, the SOCt and the target distance L, the starting and stopping basic power P0 of an engine of the vehicle is obtained; calculation is performed to obtain engine start-stop power Pu according to the start-stop basic power P0, the road slope information and the vehicle speed information; the required power Pre in the current driving process is obtained, the required power Pre is compared with the engine starting and stopping power Pu, if Pe is larger than or equal to Pu, the engine is started, if Pe is smaller than Pu, the engine is not started.

Description

technical field [0001] The present invention relates to the technical field of hybrid vehicles, and in particular, to a control method and system for switching a driving mode of a hybrid vehicle. Background technique [0002] Common new energy vehicles with hybrid structure can be driven in three different driving modes: pure electric, hybrid or pure engine. Control the vehicle to drive in pure electric mode in more road conditions and control the start and stop of the engine with a more precise power demand, avoid long-term intervention of the engine, optimize the energy management of the vehicle, and achieve better economic control. [0003] Therefore, based on the plug-in hybrid system of new energy vehicles, energy management has become the key technology of hybrid vehicle control, and its design success directly affects the performance of the whole vehicle. Energy management is related to different factors such as vehicle state, driving environment, and driver's drivin...

AI Technical Summary

Problems solved by technology

This solution has the following problems: 1) the power of each power component is only allocated according to the required power, and it is impossible to perform predictive processing on each road section; 3) It is impossible to accurately control the start and stop of the engine

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