Position controlling method of EOV (Electrically Operated Valve)

Abstract

The invention provides a position controlling method of an EOV (Electrically Operated Valve). The method comprises the steps of obtaining, a practical position signal through a controller, determining the rotating direction of a motor by comparing an objective position with a practical position, and calculating a deviation between an existing position and the practical position in the course of operating the EOV; when the position deviation is greater than a temporary parking scope, setting the objective position to be a temporary parking point, and calculating a proportional, an integral and a differential adjusted by a duty ratio of a PID (Proportion Integration Differentiation) of the motor; when the motor operates to be close to a temporary parking point, delaying for a period of time, and then setting the objective position to a primary objective position, and calculating the proportional, the integral and the differential adjusted by the duty ratio by virtue of a PID control strategy; and keeping an existing opening after the motor operates to an original objective position. The position controlling method has the advantages that a temporary parking strategy is increased on the basis of the PID control of the position of the EOV, the overshooting phenomenon of the EOV can be eliminated and the reliable and stable operation of the motor can be ensured under the precondition of improving the response time of the EOV.

Description

technical field [0001] The invention relates to the field of automobile electrical automation control, in particular to an electric valve position control method. Background technique [0002] If the electric valve overshoots at the fully open and fully closed positions, it will cause the valve to hit the mechanical limit mechanism, which will affect the reliability and durability of the valve body over time, resulting in shortened life of the valve body. At the same time, the overshoot phenomenon The adjustment process also increases the adjustment response time of the electronic valve. [0003] Chinese patent CN101573525A discloses an EGR valve control device, which includes: a motor for EGR valve switch control, a position sensor for detecting the actual opening of the EGR valve, and a motor drive duty cycle calculated according to the target position and actual position of the EGR valve motor control device. When the target position of the EGR valve is set, the motor c...

AI Technical Summary

Problems solved by technology

Therefore, the calculation of the rate of change of the valve opening is more complicated, and the reusability is not high

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