Rapid coordination optimal control method used for gear shifting process of multi-gear blade electric vehicle

Abstract

The invention discloses a rapid coordination optimal control method used for the gear shifting process of a multi-gear blade electric vehicle. As for the contradiction of dynamic property and riding comfort index requirement aspects in the gear shifting process, considering saturation constraint of a motor and a clutch execution mechanism, the motor active cooperation issue within the limited gear shifting time is described as the issue of time domain diminishing coordination optimal control over output torque of the motor and a clutch, the necessary condition of an optimal solution is obtained through a minimum principle, the optimal Lagrangian operator is solved through a method of bisection, and accordingly the solution of the optimal control problem is obtained, that is, the optimal control input acts on a motor and transmission system of the blade electric vehicle, and control at the sampling moment is finished; and optimal solution circulation at the new sampling moment is started till the end moment of an inertial phase.

Description

technical field [0001] The invention relates to a fast coordination and optimization control method for the shifting process of a multi-gear pure electric vehicle, which belongs to the control technology of the vehicle transmission system. Background technique [0002] The rapid development of the automobile industry has promoted the progress of society. At the same time, the continuous growth of car ownership has highlighted social problems such as energy crisis and environmental pollution. This has driven car manufacturers to gradually turn to the research and development of new energy vehicles represented by pure electric vehicles. At present, the most common form of mechanical drive arrangement for pure electric vehicles is to replace the internal combustion engine with an electric motor, retain the clutch, transmission, differential, etc., and adopt a single-speed transmission structure with a fixed transmission ratio. This structure is simple in design and low in cost,...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of contradictory goals such as power, economy and comfort that need to be met when shifting gears in a pure electric vehicle equipped with a multi-gear transmission mechanism, the present invention uses a multi-gear transmission mechanism The pure electric vehicle is the research object, and the dynamic analysis and modeling of the shifting process are carried out. Under the framework of model predictive control, a fast coordinated optimization control method for the shifting process of multi-gear pure electric vehicles is proposed. The fast rolling optimization control method of optimal theory and dichotomy solution, and the control performance verification result is given by simulation technology, the method of the present invention is fast, reliable and has optimization function

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