Method of controlling a solenoid valve

摘要

A solenoid valve such as a fuel injector of an automotive system is charged by a pulse width modulated (PWM) signal and is controlled by: determining a target end of command EOCtgt of the valve as a function of a PWM state and a time interval from a last change of PWM state; monitoring a current value, a PWM phase period and the PWM state of a last pulse width modulated signal; and correcting in the next pulse width modulated signal at least one of the current value and the PWM phase period, so that a next end of command of the valve will occur at the target end of command. The current value can be the maximum hold current Imax and the PWM phase period the phase period before the PWM holding phase. Both may be controlled using a weight value (k) between zero and one for the PWM phase period and one minus the weight value (1-k) for the maximum hold current.