Thermal protection control method and device for steering motor

Abstract

The invention discloses a thermal protection control method and device for a steering motor. The method comprises the following steps: acquiring a first duration of operation of the steering motor in a preset maximum working current value state; judging whether the first duration is greater than a preset first assistance duration or not; enabling the first power-assisted duration to be the duration when heat accumulated when the steering motor works at the maximum working current value reaches a thermal protection temperature value; and when the first duration is greater than the first power-assisted duration, controlling the working current value of the steering motor to be reduced to a protection current value according to a preset current coefficient, wherein the current coefficient is the rate for adjusting the current value, and the protection current value is the current value for balancing heating and heat dissipation when the steering motor works. The problem that the steering motor is overheated to be ablated or stop working due to the fact that the steering motor exceeds the maximum bearing temperature can be avoided, the working stability of the steering motor is guaranteed, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method and device for thermal protection control of a steering motor. Background technique [0002] When a car driver manipulates the steering wheel, he needs the steering motor to provide assistance to reduce the operating force of the steering wheel. The current thermal protection of the motor generally requires that the thermal protection is not activated before 15 cycles of in-situ driving, and the thermal protection means that the motor is turned off. In the prior art, thermal protection of the motor is performed by detecting the temperature sensor of the motor to determine the temperature of the motor. The motor will generate high temperature after working for a long time, and if the temperature is too high, the motor will be ablated. Generally, after 15 cycles, the motor will start thermal protection and turn off the power assist. In some extreme cases, although t...

AI Technical Summary

Problems solved by technology

In some extreme cases, this kind of protection measures can meet the needs of users, but the steering motor will often work at a relatively high temperature, resulting in unstable service life of the steering motor, and the steering motor is prone to failure

[0003] Therefore, the control strategy for the steering motor in the prior art is too simple, which will easily lead to the long-term high-temperature operation of the steering motor, resulting in a short service life of the steering motor

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