System and method for driving four-wheel full-drive electric vehicle dragged by winding type asynchronous motors

Abstract

The invention provides a system for driving a four-wheel full-drive electric vehicle dragged by winding type asynchronous motors; the system is characterized by comprising a driver operating mechanism, a vehicle steering mechanism, a differential control mechanism, an energy management system, a storage battery, four independent traction control systems, four power conversion units and four winding type asynchronous traction motors, wherein the driver operating mechanism is connected to the vehicle steering mechanism on the one hand, and is connected to the differential control system on the other hand; the vehicle steering mechanism is also connected to the differential control system; the differential control system is respectively connected with the four independent traction control systems; the four independent traction control systems are respectively connected with the four power conversion units in a way of one-to-one correspondence; and the four power conversion units are respectively connected with the four winding type asynchronous traction motors in a way of one-to-one correspondence; and the energy management system and the storage battery are respectively connected with the four power conversion units. The system is capable of more effectively improving the maneuvering capability and the stability of the vehicle.

Description

technical field [0001] The patent of the invention belongs to a traction and differential speed control system of a four-wheel full-drive electric vehicle. Background technique [0002] At present, four-wheel all-wheel drive electric vehicles mostly use permanent magnet motors, switched reluctance motors and squirrel-cage asynchronous motors for traction. In the electric state, the battery provides energy for the motor, and in the braking state, the motor feeds energy back to the battery. When the car needs a large torque to speed up or brake, the required dynamic energy will increase significantly. Due to the strict limitation of the battery on the feed current, the transient energy of the system is difficult to meet the vehicle driving performance requirements. And the frequent charging and discharging between this accumulator and motor further shortens the service life of the accumulator. [0003] Wound asynchronous motors have fast dynamic response, flexible energy dis...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The present invention provides a driving system and method for a four-wheel all-wheel drive electric vehicle that adopts winding asynchronous motor traction. Adjust the speed of the left and right wheel traction motors when turning, improve the energy recovery rate, and solve the problem of unsatisfactory control effects of the previous control system

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