Control method and control system for optimal power allocation of CVT (continuously variable transmission) hybrid electric vehicle

Abstract

The invention relates to the technical field of hybrid electric vehicles and discloses a control method and a control system for optimal power allocation of a CVT (continuously variable transmission) hybrid electric vehicle. According to the method, the maximum total efficiency of the entire hybrid system is used as the optimizing target, the optimal torque allocation of an engine and a motor is obtained by an off-line optimization, and the CVT speed ratio is determined simultaneously, so that the working state of the engine, the motor and a transmission system can obtain the best matching at any optional working condition, and the optimal working efficiency of the entire vehicle can be reached; and the fuel economy, the operability, the stability and the riding comfort of the entire vehicle are further improved while the dynamic property requirement of the vehicle is satisfied.

Description

technical field [0001] The present invention relates to the technical field of hybrid electric vehicles, and more specifically, relates to a method and system for power optimization distribution control of a CVT hybrid electric vehicle. Background technique [0002] Currently, a CVT (Continuously Variable Transmission) is widely used as an automatic transmission for motor vehicles and the like, which eliminates the concept of a gear position and continuously changes a transmission ratio. Cars using CVT often use automatically controlled stepless shifting, which improves the fuel economy of the vehicle, and improves the power and ride comfort of the vehicle. [0003] The existing hybrid electric vehicles equipped with CVT optimize the engine operating point, that is, let the engine work in the high-efficiency area as the optimization goal, distribute the engine and motor torque, and determine the CVT speed ratio. This method ignores the motor, battery, etc. Due to the influe...

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Problems solved by technology

[0005] In view of this, the present invention provides a method and system for power optimal distribution control of a CVT hybrid electric vehicle to overcome the failure of the vehicle in any driving condition due to the inability to distribute the torque of the power source reasonably in the prior art. It can realize the best matching of the working state of the engine, motor and transmission system according to the driver's operation intention, achieve the optimal work efficiency of the whole vehicle, and further improve the fuel economy, power, operability, stability and ride comfort of the whole vehicle The problem

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