Valve timing control apparatus and valve timing control...

Details Valve timing control apparatus and valve timing control... Valve timing control apparatus and valve timing control...

2009-04-15

2010-10-19

Cronin, Stephen K (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S090170

Reexamination Certificate

active

07818113

ABSTRACT:
A valve timing control apparatus for a valve timing adjustment mechanism that adjusts timing of opening and closing an intake or exhaust valve of an engine includes an output-side rotor, a cam-side rotor, a hydraulic pump, a control device, a control valve, a storage device. The control device outputs a signal associated with rotation of one of the rotors relative to the other one. The control valve controls the speed of the rotation. The storage device prestores standard data indicating a predetermined relation between a dead zone width and a parameter correlated with the dead zone width for each hydraulic oil temperature. A value of the parameter of the adjustment mechanism during a hold state is learned by changing the signal. The control device computes the signal based on the value learned, the standard data, and hydraulic oil temperature.

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