A pure electric powertrain and its control method

Abstract

The invention discloses a pure electric power assembly and a control method thereof. The pure electric power assembly includes a first motor, a second motor, a main gearbox and an auxiliary gearbox. The main gearbox includes an output shaft of the main gearbox, a first The input shaft and the second input shaft, the first shifting shaft and the second shifting shaft, the first and second input shafts are fixedly connected with a first gear and a second gear, and the first and second shifting shafts are fixedly connected. The empty sleeve is provided with a first-speed meshing gear and a second-speed meshing gear, and both are fixedly connected with a shift output gear, a shifting mechanism is arranged between the first-speed and second-speed meshing gears, and the output shaft of the main gearbox is provided with a shifting output gear. The output end of the output shaft of the main gearbox is the input end of the auxiliary gearbox, and the auxiliary gearbox is provided with a deceleration mechanism. The invention can reduce the dynamic load of components such as bearings and improve the reliability under the condition of high torque.

Description

technical field [0001] The invention relates to the technical field of new energy vehicles, in particular to a pure electric power assembly 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 the development of new energy vehicles. However, the current pure electric vehicle powertrain, especially the dual-motor powertrain, still has unreasonable layout of the powertrain, which does not meet the application requirements of heavy commercial vehicles. Heavy-duty commercial vehicles have high-speed, high-efficiency and low-speed torque application requirements. The maximum vehicle speed is required to reach 80km / h to 90km / h, and the powertrain is required 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 la...

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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