Dual-motor automatic variable-speed drive system of electric vehicle

Abstract

The invention discloses a dual-motor automatic variable-speed drive system of an electric vehicle. The dual-motor automatic variable-speed drive system comprises a main motor and a transmission variable speed assembly. The transmission variable speed assembly comprises a box body, a power input shaft and a power output shaft, wherein the power input shaft and the power output shaft are arranged on the box body in the mode that the power input shaft and the power output shaft can rotate around the axis of the power input shaft and the axis of the power output shaft. The main motor can input power into the power input shaft to achieve gear shifting and speed changing, wherein the power can switched in the positive direction and the negative direction. The dual-motor automatic variable-speed drive system of the electric vehicle further comprises an auxiliary motor which provides auxiliary output power for the power output shaft when the main motor switches the rotation direction. The auxiliary motor in transmission connection with the power output shaft is arranged to provide the auxiliary output power for the power output shaft when the main motor switches the rotation direction to cause power failure in the gear shifting process, and smoothness of gear shifting and dynamic property of running of the vehicle are improved. In addition, in the vehicle regenerative brake process, the auxiliary motor can be used as an engine, part of the kinetic energy of the vehicle is converted into electric energy, part of electricity is stored, and therefore the driving range is prolonged.

Description

technical field [0001] The invention relates to a motor vehicle component, in particular to a double-motor automatic variable-speed drive system for an electric vehicle. Background technique [0002] An electric vehicle is a vehicle driven by electricity and powered by electricity. As a means of transportation, electric vehicles have the advantages of being friendly to the environment and low dependence on oil, and are receiving more and more attention in today's society that advocates energy conservation. [0003] Electric vehicles generally include power supply, motor, transmission, running assembly and control system. Due to the limitation of the electric motor's operating characteristics, most of the transmissions of electric vehicles in the early days did not have gear settings, or only had a single slow gear, which was extremely inconvenient to operate. With the continuous research in the field of electric vehicles, some variable speed drive systems specially designed...

AI Technical Summary

Problems solved by technology

[0003] Electric vehicles generally include power supply, motor, transmission, walking assembly and control system. Due to the limitation of the electric motor's operating characteristics, most of the transmissions of electric vehicles in the early days did not have gear settings, or only had a single slow gear, which was extremely inconvenient to operate.

With the continuous research in the field of electric vehicles, some variable speed drive systems specially designed for electric vehicles have emerged, but most of them have complex structures, space installation is not compact enough, and the shifting is not smooth enough, and power interruptions are prone to occur between gears. phenomenon, resulting in insufficient continuation of the power of the car body during driving; and when the car body of the existing electric car brakes, most of the kinetic energy is directly converted into heat energy generated by friction, which increases the power consumption and causes energy consumption. waste, thereby increasing the cost of the battery and reducing the driving range, which is not conducive to energy saving and poor economy

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