Power split hybrid electric vehicle mode switching control system and control method considering driving working conditions

Abstract

The invention discloses a power split hybrid electric vehicle mode switching control system and method considering driving working conditions, and belongs to the field of automobile dynamic control. A mode switching control system adopted by the method comprises a mode switching identification module, a driving condition identification module, an engine starting rotating speed optimization module and a torque control distribution module. The mode switching identification module judges whether to switch from a pure electric mode to a hybrid mode; the driving condition identification module determines a driving condition; an engine starting rotating speed optimization module calculates an optimal engine starting rotating speed curve under different working conditions; the torque control distribution module carries out reasonable distribution based on a terminal sliding mode and a least square control distribution method. According to the mode switching method, different engine rotating speed optimization curves are selected according to actual requirements for the mode switching phenomenon of the power split type hybrid electric vehicle according to different driving working condition requirements, and the requirements of different working conditions for switching time, dynamic property and smoothness are met.

Description

technical field [0001] The invention relates to a mode switching control system and a control method of a power split hybrid electric vehicle considering driving conditions, and belongs to the field of vehicle dynamic control. Background technique [0002] my country's "Energy Saving and New Energy Vehicle Technology Route" figure 2 .0" clearly stated that we should focus on the development of hybrid electric vehicles, and power-split hybrid electric vehicles with high integration and high performance have become a hot research object at present. Power-split hybrid electric vehicles have multiple power sources. Faced with different driving environments, different working modes are divided according to the optimal working curve of the power source to achieve energy saving and emission reduction. The main working modes are engine drive, pure electric drive and Engine and electric motor hybrid drive mode, through the design of energy management strategy can ensure the reasonab...

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Problems solved by technology

[0004] In order to improve the mode switching quality of the power-split hybrid electric vehicle from the pure electric mode to the hybrid mode when facing different driving conditions, and improve the power and smoothness of the mode switching under different driving conditions, the present invention proposes A power-split hybrid electric vehicle mode switching control system and its control method, the purpose of which is to formulate a suitable engine starting speed curve in the face of complex vehicle driving conditions, and to meet the three requirements of mode switching time, torque demand and ride comfort room demand

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