Engine valve operation timing control apparatus

Details Engine valve operation timing control apparatus Engine valve operation timing control apparatus

1995-08-08

1996-10-08

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 123 9031, F01L 134

Patent

active

055620710

ABSTRACT:
An engine valve operation timing control apparatus having a learning control function determines whether both of an actual phase difference angle and a target value between a crankshaft and a camshaft are almost constant for a predetermined time. When both of the actual phase difference angle and the target value become almost constant for the predetermined time, a control value is learned. A controller outputs the learned value to driving means to find a control value thereafter based on the learned value. As a result, the learning means learns the control value in correspondence with a rate of change of the actual phase difference angle and the control value found by the controller compensates for a disturbance factor. The learning operation is updated every time the actual phase difference angle and the target value converge to a constant value and is repeated when the convergence state continues.

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