Dual-motor transmission for electric vehicles and shift control method thereof

Abstract

The invention discloses a dual-motor two-speed transmission for an electric vehicle. The dual-motor two-speed transmission comprises two motors and a mechanical automatic transmission, a first gear is fixedly connected with an output shaft of the transmission, a first input shaft of the transmission is sleeved with a second gear and a third gear in an idle mode, a fourth gear is fixedly connected to a second input shaft of the transmission, an output shaft of the first motor is connected with the first input shaft of the transmission, an output shaft of the second motor is connected with the second input shaft of the transmission, a first coupling is fixedly connected to the first input shaft of the transmission in a sleeved mode and can be engaged with or disengaged from the second gear, a second coupling is fixedly connected to the first input shaft of the transmission in a sleeved mode and can be engaged with or disengaged from the third gear, and a third coupling is fixedly connected to the second input shaft of the transmission and can be engaged with or disengaged from the fourth gear. The dual-motor two-speed transmission is simple in structure, high in acceleration performance and gradeability, and smooth in gear shifting, it can be guaranteed that power is not intermittent, and kinetic energy generated in the driving process of the vehicle can be converted into part of electric energy in the braking process. The invention further discloses a gear shifting control method of the dual-motor two-speed transmission for the electric vehicle.

Description

technical field [0001] The invention belongs to the technical field of electric vehicle transmission, and in particular relates to a dual-motor transmission for an electric vehicle and a shift control method thereof. Background technique [0002] How to reduce the energy consumption and environmental pollution of automobiles has become the main theme of the current automobile industry development. In the past two years, my country's pure electric vehicles have developed rapidly. Many companies have launched pure electric vehicles on the market, and pure electric vehicles have entered industrialization. [0003] There are many kinds of drive mechanisms for pure electric vehicles, such as traditional drive trains with multi-speed transmissions and clutches, single-speed transmissions without clutches, two independent electric motors, and fixed-speed transmissions with drive shafts. The traditional drive system equipped with multi-gear transmission and clutch has multiple gear...

AI Technical Summary

Problems solved by technology

[0004] On the other hand, the car has different power requirements during the acceleration, low-speed and high-speed driving stages. If a single motor is used, it is difficult for the motor to work in the high-efficiency operating area all the time, which will easily cause waste of electric energy.

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