POSITION DETECTING DEVICE OF NEEDLE OF ELECTROMAGNETIC ACTUATOR AND DETECTING METHOD THEREFOR, INTAKE AIR RATE CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE AND CONTROL METHOD THEREFOR, AND DIAGNOSTIC METHOD FOR AUTOMOBILE ACTUATOR

摘要

PROBLEM TO BE SOLVED: To reduce the parts weight of an actuator by detecting starting speed of current which flows in an electromagnetic coil when a rectangular voltage is imputted, and detecting the position of movable member from start speed of current which is detected thereby. ;SOLUTION: The current command value c of an air control valve is read in and memorized in S701, a table in which the staitonary state D of the current command value C is used is found out referably, and the inductance value D is memorized in s702. The starting characteristic of current which flows on an electromagnetic coil is detected as change caused when voltage of a shaft for detecting current is reduced, and a real inductance E is found out and memorized from an inclining in S703. The stationary state inductance D and the real inductance E are compared with each other in S704, it is judged that an air control valve is locked at an opening large in the case where the real inductance E is smaller than the stationary state inductance D, for example, reduction of fuel is made and an ignition timing is delayed, and thereby, real rotational speed is controlled to approach a target rotational speed.;COPYRIGHT: (C)1998,JPO