Pure electric power assembly and control method thereof

Abstract

The invention discloses a pure electric power assembly and a control method thereof. The pure electric power assembly comprises a first motor, a second motor, a main gearbox and an auxiliary gearbox,and the main gearbox comprises a main gearbox output shaft, a first input shaft, a second input shaft, a first gear shifting shaft and a second gear shifting shaft; a first-gear gear and a second-geargear are fixedly connected to the first input shaft and the second input shaft respectively, a first-gear meshing gear and a second-gear meshing gear are arranged on the first gear shifting shaft andthe second gear shifting shaft respectively in an empty sleeving mode and fixedly connected with gear shifting output gears respectively, and a gear shifting mechanism is arranged between the first-gear meshing gear and the second-gear meshing gear. An output shaft of the main gearbox is provided with a main speed changing gear meshed with the gear shifting output gear, the output end of the output shaft of the main gearbox is the input end of the auxiliary gearbox, and a speed reducing mechanism is arranged in the auxiliary gearbox. The dynamic load of parts such as a bearing can be reducedunder the large-torque working condition, and the reliability of the parts is improved.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a pure electric powertrain and a control method thereof. Background technique [0002] With the continuous development of new energy vehicles, more and more pure electric vehicles have become the mainstream of new energy vehicles. However, the current pure electric vehicle powertrain, especially the dual-motor powertrain, still has unreasonable powertrain layout and cannot meet the application requirements of heavy-duty commercial vehicles. Heavy-duty commercial vehicles have the application requirements of high-speed efficiency and low-speed torque. The maximum speed is required to reach 80km / h-90km / h, and the powertrain is also required to be able to exert a very large torque in the low-speed area. For example, urban construction dump trucks require The powertrain can output a torque of 20,000 to 30,000 N·m. At the same time, under such a large torque, the dynamic ...

AI Technical Summary

Problems solved by technology

At present, the existing technology mainly uses a high-speed motor with a maximum speed of more than 10,000r / m to reduce the torque of the motor. However, after the maximum speed is increased, the magnetic field weakening loss of the motor will also increase accordingly.

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