Valve timing control apparatus for engine

Details Valve timing control apparatus for engine Valve timing control apparatus for engine

1996-03-26

1997-05-13

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, F01L 134, F01L 1300

Patent

active

056282869

ABSTRACT:
An improvement of a valve timing control apparatus for an engine is disclosed. The apparatus has an intake valve and an exhaust valve which are alternately opened and closed in a valve timing sequence according to a rotation of a cam shaft. A timing pulley mounted on the cam shaft has a housing accommodating a plunger movable therein and a sleeve secured to the cam shaft. The housing has a first and second pressure chambers defined by the plunger and sealed with respect to each other. The plunger is arranged to move in an axial direction to selectively advance and retard the cam shaft based on differential pressure between the first pressure chamber and the second pressure chamber. A controller controls an electromagnetic valve with a specific control value to adjust the fluid pressure to be supplied to the first and second pressure chambers to maintain the valve timing sequence converged to a target valve timing. The controller corrects the specific value based on a rotational speed of the engine when the plunger is in one of the extreme positions in the chambers, and adjusts the fluid pressures based on the corrected specific value.

REFERENCES:
patent: 5243935 (1993-09-01), Kano et al.
patent: 5271360 (1993-12-01), Kano et al.
patent: 5333577 (1994-08-01), Shinojima
patent: 5363817 (1994-11-01), Ikeda et al.
patent: 5469818 (1995-11-01), Yoshioka et al.
patent: 5482012 (1996-01-01), Yoshioka
patent: 5522352 (1996-06-01), Adachi et al.

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