Apparatus for detecting reference position of servo-controlled m

Details Apparatus for detecting reference position of servo-controlled m Apparatus for detecting reference position of servo-controlled m

1993-06-01

1995-10-31

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

388811, 477175, 477180, 192103R, B60K 2604

Patent

active

054632986

ABSTRACT:
An apparatus that detects a reference position of a throttle valve. The throttle valve is forced in either a valve opening direction or a valve closing directions by an urging member. A DC motor, which is connected to the throttle valve, drives the throttle valve against the force created by the urging member within a rotatable angle that is restricted by a stopper. A throttle valve opening sensor detects an opening angle of the throttle valve. A lock current detecting circuit detects a lock current created by the DC motor when the DC motor is brought into contact with the stopper. A throttle valve reference position renewing circuit updates the reference position, which is memorized in a throttle valve reference position memory, on the basis of an opening angle of the throttle valve, which is detected by the throttle valve opening sensor, when the lock current detecting circuit detects the lock current.

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patent: 5252902 (1993-10-01), Uehara et al.

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