Method and system for controlling dynamic gear and economical gear of pure electric automobile

Abstract

The invention provides a method and a system for controlling a dynamic gear and an economical gear of a pure electric automobile. The system comprises an entire automobile controller, a gear shifter, an accelerator pedal, a brake pedal, a drive motor controller and a power battery controller, wherein the whole automobile controller is used for judging whether the automobile is in a dynamic running state, an economical running state, a driving state, a braking state or a sliding state according to a gear signal of the gear shifter, an opening signal of the accelerator pedal, an on-off signal of the brake pedal, an automobile speed signal and the like, and formulating a corresponding torque calculation strategy, as well as collecting a gear shifter fault signal, an accelerator pedal failure signal, a failure signal fed back by the drive motor controller, a fault signal fed back by the power battery controller and the like, performing fault diagnosis and finally sending target torque to control the power output of the automobile. By virtue of the gear shifting, the method and the system can be used for reducing the energy consumption rate of the system and improving the driving mileage of the whole automobile while meeting an automobile dynamic performance target.

Description

technical field [0001] The invention relates to the technical field of vehicle power system control, in particular to the control technology of pure electric vehicle power system. Background technique [0002] With the gradual scarcity of global oil resources and the increasingly prominent environmental problems, pure electric vehicles have gradually entered the stage of industrialization due to their advantages such as low noise and zero emissions. It is more and more inclined to improve the overall performance of power, economy, handling stability, driving comfort and so on. [0003] At present, the power transmission system of pure electric vehicles mostly adopts the structural form of a driving motor combined with a single-stage reducer, and only one power gear is set in the setting of the driving gear to meet the driving requirements of the vehicle. Although this method can meet performance indicators such as the maximum speed of the vehicle, acceleration time, and max...

AI Technical Summary

Problems solved by technology

Although this method can meet performance indicators such as the maximum speed of the vehicle, acceleration time, and maximum gradeability, it often ignores the use of the high-efficiency area of ​​the power system, especially when the vehicle is running at medium and high speeds, the reserve power of the vehicle is too large, causing the power system to fail. The waste of power and the high energy consumption rate will affect the mileage of the whole vehicle, making it difficult to balance the goals of vehicle power and economy

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