Three-clutch three-gear speed change transmission device and three-clutch method thereof

Abstract

The invention relates to the field of electric automobiles and in particular relates to a three-clutch three-gear speed change transmission device for changing the speed of an electric automobile and a three-clutch method thereof. The three-clutch three-gear speed change transmission device comprises a box body, wherein an input shaft and an output shaft sleeved on the input shaft are arranged in the box body; the input shaft is connected with the output shaft through a first clutch; a first middle shaft and a second middle shaft are arranged in the box body; the first middle shaft is connected with the second middle shaft through a second clutch; a third middle shaft and a fourth middle shaft are arranged in the box body; the third middle shaft is connected with the fourth middle shaft through a third clutch; and the shafts are provided with gears which have different sizes and are meshed with one another. When the second clutch is controlled to be closed, the automobile can get relatively large traction and relatively large torque at a low speed; when the first clutch is closed, a motor is in a stable running state; when the third clutch is closed, the rotating speed of the motor is increased to a designed value; and therefore, the requirement of the electric automobile on high rotating speed is met.

Description

technical field [0001] The invention relates to the field of electric vehicles, and more specifically relates to a three-clutch three-speed transmission device for electric vehicle speed change and a three-clutch method for the transmission device. Background technique [0002] Cars are already an indispensable means of transportation for human beings, but with global warming and the increase in oil costs, people are forced to invest a lot of money in the development and research of electric vehicles to alleviate human dependence on oil and reduce environmental pollution. Traditional electric vehicles have two modes of DC and AC. The DC electric control system and the AC electric control system are the basic components to control the driving speed of electric vehicles. Although this electrical control system can adjust the speed of the motor to control the speed of the vehicle, it cannot change the difference. Different road conditions require different transmission torques...

AI Technical Summary

Problems solved by technology

When the electric vehicle is in the state of traction drive, the operating efficiency of the motor is the highest in the rated load and rated speed area, but in actual operation, the motor often operates at a low load and low speed, and a large amount of energy is consumed in copper consumption and In terms of iron loss, the maximum operating efficiency of the traction motor cannot be achieved

When the electric vehicle is in the braking state, the kinetic energy can be converted into electric energy to charge the battery pack, that is, energy recovery is performed on the electric vehicle. During the energy recovery process, according to the motor working efficiency curve, it is known that the motor can only work at the best efficiency In order to recover the braking energy effectively, the motor speed must be in the best efficiency range. When the motor speed is lower than the minimum speed required to reach a certain best efficiency range, this part of the braking energy cannot be recovered, which will greatly Reduced energy recovery efficiency

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