Self-diagnosis driving method and circuit for controlling electromagnetic actuator inside internal combustion engine

Abstract

The invention provides a self-diagnosis driving method for controlling an electromagnetic actuator inside an internal combustion engine. The method includes the following steps that: the driving cycleof an electromagnetic actuator L comprises three phases, namely, a first closed-loop control phase, an open-loop control phase, and a second closed-loop control phase; in the first closed-loop control phase, closed-loop control is performed on the driving current I of the electromagnetic actuator L, so that the driving current I can continuously rise until the driving current reaches a driving current peak value; in the open-loop control phase, open-loop control is performed on the driving current I of the electromagnetic actuator L, and the driving current of the electromagnetic actuator L is controlled with PWM signals, if the lowest point, namely, characteristic point of the driving current I in the open-loop control phase is found out, a time point corresponding to the characteristicpoint is the opening time of the electromagnetic actuator; and in the second closed-loop control phase, closed-loop control is performed on the driving current of the electromagnetic actuator L, so that maintenance current can be kept. With the method of the invention adopted, diagnosis cost can be reduced; and the driving process of the actuator is diagnosed, and therefore, opening cumulative error can be eliminated, and the accuracy of diagnosis can be improved.

Description

technical field [0001] The invention relates to the field of engine electric control drive, in particular to a self-diagnostic drive method for controlling an electromagnetic actuator inside an internal combustion engine. Background technique [0002] The drive of electromagnetic actuators in internal combustion engines, especially in the control of valve components of the throttle valve, requires precise drive control. Foreign patents such as EP1653066B1 are control methods in similar fields, but they only propose the basic framework of the drive, and do not design self-diagnosis during the drive process. Similarly, Japan's P2012-29312A also only optimized the details of the drive, such as the design of current control accuracy, and did not design related diagnostics. Domestic patent 201410145536.2 describes the online detection method of electrical parameters of medium and low-speed maglev trains. Although it also uses the non-mutable current characteristic of the inducto...

AI Technical Summary

Problems solved by technology

[0005] 1) Increased cost, not only the additional cost of the sensor itself, but also the cost of the entire process;

[0006] 2) To increase the complexity of the system, additional sensor processing circuits and signal processing circuits need to be added; in addition, additional requirements are placed on the design of the mechanical structure

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