Automatic gearshift device of electric vehicle

Abstract

The invention discloses an automatic gearshift device of an electric vehicle and relates to the field of vehicle-speed control components. The present electric vehicle is controlled by a Hall rotating handle opening ring, cannot realize the automatic conversion of the road condition and the torsion, restricts the application in mountainous and hilly regions and starts heavy current so as to shorten the service life of a storage battery, an electric motor, a controller and other important components., therefore, according to the technical scheme provided by the invention, the automatic gearshift device comprises a tower type transmission gear which is rotatably connected with the electric motor; the tower type driving gear is rotatably connected with a disc spring cam differential drive sensor which is connected with a cam transmission ECU (Electronic Control Unit) controller; and the ECU controller is connected with an electrical signal of the electric motor to form closed loop control. The invention has the advantages of strong climbing capability, long trip mileage, high automatic degree, quick response, energy saving and long service life.

Description

technical field [0001] The invention relates to the field of vehicle speed control components, in particular to an automatic shifting device for an electric vehicle. Background technique [0002] The driving power of the electric vehicle comes from the electric motor, but the range of torque of the electric motor is small, and the traction force and speed cannot adapt to the changing requirements of various complex resistance ranges. At present, the speed of electric vehicles is adjusted only by adjusting the duty cycle (pwm). The duty cycle is the ratio of the cycle time occupied by the high level to the entire cycle time. When starting, accelerating or climbing a slope, the driving wheels are very easy to slip excessively, resulting in poor driving performance, handling performance and stability of the vehicle; the moment of starting is maintained by a large current, which has a large impact on the battery and controller, and downhill and coasting The medium back electrom...

AI Technical Summary

Problems solved by technology

[0002] The driving power of the electric vehicle comes from the electric motor, but the range of torque of the electric motor is small, and the traction force and speed cannot adapt to the changing requirements of various complex resistance ranges.

At present, the speed of electric vehicles is adjusted only by adjusting the duty cycle (pwm). The duty cycle is the ratio of the cycle time occupied by the high level to the entire cycle time. When starting, accelerating or climbing a slope, the driving wheels are very easy to slip excessively, resulting in poor driving performance, handling performance and stability of the vehicle; the moment of starting is maintained by a large current, which has a large impact on the battery and controller, and downhill and coasting The medium back electromotive force has a great impact on the controller and the motor itself, and the controller and the motor are easy to burn out during climbing and long downhill; it cannot meet the requirements of complex road conditions, and it is necessary to frequently turn the handle and brake, resulting in a large waste of battery energy , which shortens the mileage of the electric vehicle; at the same time, the impact on the controller MOS tube is too large

Therefore, at present, the speed is adjusted only by the duty cycle, which restricts the application in mountains and hills, and shortens the service life of the battery, controller, and motor.

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