Wheel motor slip processing control system and slip processing method of wheel motor

Abstract

The invention discloses a wheel motor slip processing control system which comprises multiple motor controllers (MCUs), wherein the MCUs are mutually connected through a CAN (controller area network) bus, and all can work in a normal driving mode or slip processing mode; when working in the normal driving mode, the MCUs control corresponding wheel motors to output first torques T1; when working in the slip processing mode, the MCUs control the corresponding wheels motor to output second torques T2; the MCUs also can work in an auxiliary slip processing mode, and control the corresponding wheel motors to output third torques T3 when working in the auxiliary slip processing mode; and when any one of the MCUs works in the slip processing mode, the MCU working in the slip processing mode notifies the MCU working in the normal driving mode to switch to the auxiliary slip processing mode, wherein T1>T3>T2.

Description

technical field [0001] The invention relates to an automobile power system, in particular to a wheel-side motor slip treatment control system and a wheel-side motor slip treatment method. Background technique [0002] In the existing electric vehicle power control system, the motor controller calculates the output torque of the motor by receiving the gear position, brake, accelerator and parking status signals from the engine controller, and controls the motor to work to ensure the normal operation of the vehicle. run. [0003] When the vehicle enters a relatively slippery road (such as ice) from a normal road surface, the load of the motor suddenly decreases due to the reduction of tire friction, and the rotation speed of the motor rotor has a large step due to the sudden unloading of the load , the resulting inrush current is likely to cause the overcurrent protection of the motor, which directly leads to the loss of control of the motor due to power failure. In the exis...

AI Technical Summary

Problems solved by technology

[0004] However, at present, the slipping control of the motor is only aimed at a single motor controller and a single power control system. For the existing wheel-side drive system (that is, the wheel-side motors are respectively installed on different wheels of the vehicle, and each wheel-side motor uses an independent For electric vehicles controlled by motor controller and power control system), different wheels may be in different working conditions under special circumstances, such as a single wheel slipping, since different wheels are controlled by different wheel motors during driving While the other wheel is still in the normal driving condition, at this time, the motor controller of the slipping wheel enters the slipping processing mode and reduces the output torque of the wheel motor, while the motor controller of the normal wheel still controls the wheel motor according to the current torque Therefore, the wheel motors of different wheels have different output torques, and it is likely that the actual effective relative displacement of different wheels to the ground differs too much, resulting in unstable driving of the vehicle, and even a phenomenon of loss of direction control.

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