Valve timing control apparatus for internal combustion engine

Details Valve timing control apparatus for internal combustion engine Valve timing control apparatus for internal combustion engine

1993-11-30

1995-03-28

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F01L 134

Patent

active

054007470

ABSTRACT:
A valve timing control apparatus in an internal combustion engine, designed to improve its controllability by deciding a control value by taking into consideration the number of the internal combustion engine and the direction to which the valve timing is to be changed, said valve timing control apparatus which changes the valve timing by changing the rotational phase of the camshaft with respect to the crankshaft comprising: means for detecting the operating condition of the internal combustion engine; means for deciding an optimum timing of the valve from the operating condition detected; means for grasping the present timing of the valve by detecting a phase difference of the camshaft from the crankshaft; and means for causing the present timing to become the optimum timing, wherein there is further provided means for discriminating the direction (advance, retard) to which the valve timing is to be changed from a phase difference between the present timing and the optimum timing in order that the change of direction is reflected in the decision of the control value.

REFERENCES:
patent: 4651684 (1987-03-01), Masuda et al.
patent: 4811698 (1989-03-01), Akasaka et al.
patent: 4856465 (1989-08-01), Denz et al.
patent: 4928640 (1990-05-01), van Vuuren et al.
patent: 5184578 (1993-02-01), Quinn, Jr. et al.

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