Method of and apparatus for controlling valve operation in an in

Details Method of and apparatus for controlling valve operation in an in Method of and apparatus for controlling valve operation in an in

1988-11-18

1989-10-17

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9016, 123 9031, F01L 902, F01L 102

Patent

active

048739499

ABSTRACT:
A method and apparatus for controlling valve operation in an internal combustion engine having a crankshaft during with a cam for opening and closing an intake or exhaust valve which is spring-biased in a closing direction. The method comprises the steps of varying the angular phase of the crankshaft and the camshaft to control the timing of the opening of the valve and releasing the force applied by the cam to open the valve while it is being opened to control the timing of the closing of the intake or exhaust valve. The apparatus includes a phase control mechanism disposed between the crankshaft and the camshaft and a lift control mechanism disposed between the cam and the intake or exhaust valve. Both mechanisms are hydraulically operated and controlled in response to engine operating conditions.

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patent: 4787345 (1988-11-01), Thoma
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