Auto-calibration of a solenoid operated valve

摘要

Operation of an electrically operated valve (20,22,34,36) is calibrated by applying a gradually increasing electric current (Ic) to the valve. While that is occurring pressure at either the inlet or outlet of the valve is measured to detect when the valve opens. When the valve opens the level of the electric current then being applied to the valve is employed to determine an initial current level (IINT) to use subsequently whenever the valve is to be opened.