Patent ID: 6354563
Filing Date: 2002-03-12
Classification: F01L

Abstract:
An electromagnetic drive valve, comprising:a valve body that is movable between a first displacement end and a second displacement end based on a displacement request; an electromagnet that attracts an armature that cooperates with the valve body; a current supply that supplies a current to the electromagnet; a position detector that detects a position of the valve body between the first displacement end and the second displacement end when the valve body is moved from the first displacement end toward the second displacement end; and a controller that changes a waveform of the current to be supplied from the current supply to the electromagnet, based on at least the position of the valve body detected by the position detector, wherein the position detector at least detects the position of the valve body at an elapse of a first predetermined time after an output of the displacement request and at an elapse of a second predetermined time after the output of the displacement request, the second predetermined time being longer than the first predetermined time.