An electric drive axle system based on a two-speed transmission and its control method

Abstract

The invention discloses an electric drive axle system based on a two-gear transmission and a control method thereof. The electric drive axle system comprises a shell, a motor, a two-gear speed change mechanism and a differential mechanism, wherein the motor is fixed to one side of the inside of the shell and comprises a drive motor shaft; the two-gear speed change mechanism is fixed into the shell, is connected with the drive motor shaft and performs speed change on output power; and the differential mechanism is connected with the two-gear speed change mechanism and is fixed to the other side of the inside of the shell, and the differential mechanism comprises a first output shaft and a second output shaft. The output end of the first output shaft stretches out of the shell. The output end of the second output shaft stretches out of the shell. The differential mechanism conducts constant speed or differential speed output on the output power after speed change through the first output shaft and the second output shaft. According to the electric drive axle system, the motor, the two-gear speed change mechanism and the differential mechanism are integrated into an integral structure through the shell. Hence, the electric drive axle system has the advantages that the number of parts is small, the structure is compact, and installation is convenient; and moreover, the number of engaged gears in the transmission process is small, and transmission efficiency can be effectively improved.

Description

technical field [0001] The invention relates to the driving field, in particular to an electric drive axle system based on a two-speed transmission and a control method thereof. Background technique [0002] Electric vehicles are new, energy-saving and environmentally friendly vehicles, especially in today's environment with severe air pollution, they have great development potential and broad application prospects. An electric vehicle uses an electric motor to replace the engine of a traditional car. The electric motor can be started with load and can meet the requirements of the car through reasonable configuration, which is a big difference from the engine. It is no longer suitable to use multi-speed transmissions on electric vehicles, but if the variable speed transmission device is cancelled, it will be difficult to meet the requirements of vehicle climbing and high-speed driving, especially for small and medium-sized vehicles, it is necessary to redesign the power of e...

AI Technical Summary

Problems solved by technology

The layout of the existing two-speed transmissions for electric vehicles mostly adopts the parallel shaft type and the planetary row type. The two-speed transmissions that adopt the parallel shaft type layout usually use synchronizers or clutches to switch gears. If synchronizers, etc. are used to achieve The shifting of the gears has the following disadvantages: it is necessary to install a shift actuator separately, which increases the volume of the drive system, which is not convenient for the layout of the vehicle, and there is a power interruption during the shifting process; Two-speed transmissions mostly switch between gears through a combination of clutches or brakes, but they have the following disadvantages: the shifting actuators are scattered, and the size of the transmission and differential is large, resulting in an insufficiently compact drive system.

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