Method and device for controlling stepping motor self-learning

Abstract

The invention discloses a method and device for controlling self-learning of a stepping motor and belongs to the technical field of automobile electronic control. The method includes: determining first step number and an out-of-step protection value of the self-learning, and setting total step number of the self-learning according to the determined first step number and the out-of-step protection value of the self-learning; and controlling the self-learning of the stepping motor according the set total step number of the self-learning. The method and device for controlling the self-learning of the stepping motor controls the self-learning through the total step number of the self-learning set according to the first step number and the out-of-step protection value, thereby guaranteeing that the stepping motor moves to an off-position when the self-learning is ended, reducing out-of-step of the stepping motor, and improving idle speed control quality. Simultaneously, the method and device for controlling the self-learning of the stepping motor controls the stepping motor to perform self-learning by adopting a stepping preset step-back delayed preset time mode, reduces stepping speed of the stepping motor when the stepping motor is close to the off-position, can effectively prevent the stepping motor from rebounding, and prolongs service life of the stepping motor.

Description

technical field [0001] The invention relates to the technical field of automobile electronic control, in particular to a method and equipment for controlling self-learning of a stepping motor. Background technique [0002] In order to provide the ideal idle air volume under all possible working conditions, it is particularly important to control the idle speed of the car. The stepper motor is a very important component when controlling the idle speed of the car, and its control strategy directly affects the quality of the idle speed control. The control strategy of the stepper motor is open-loop control. The ECU (Electronic Control Unit, electronic control unit) controls according to the required position, but it cannot identify whether the stepper motor has really reached the predetermined position according to the demand through feedback. The stepper motor is often due to the signal Problems such as interference lead to stepping motor control out-of-step, and stepping mot...

AI Technical Summary

Problems solved by technology

[0005] Since the ECU drives the stepper motor to take the Step_currentt step in an open-loop control mode, this open-loop control method makes it impossible for the ECU to recognize the actual number of steps taken by the stepper motor after the ECU drives the stepper motor to take the Step_currentt step. The situation that the closed position has not been reached after learning, the self-learning has not reached the closed position, which will affect the idle speed control when the car starts next time; in addition, because the stepping motor uses a fixed frequency to step to the closed position during self-learning, When the out-of-step is small, the stepper motor keeps stepping in the closed position with a fixed frequency, which will cause the stepper motor to bounce back in the closed position to generate a new out-of-step, and also affect the service life of the stepper motor

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