Patent ID: 6173684
Filing Date: 2001-01-16
Classification: F01L

Abstract:
A reciprocating valve actuation and control system for the cylinders of an internal combustion engine including a crankshaft and a crankshaft position sensor, comprising:a poppet valve moveable between a first and second position;a source of pressurized hydraulic fluid;a hydraulic actuator including an actuator piston coupled to the poppet valve and reciprocating between a first and second position responsive to flow of the pressurized hydraulic fluid to the hydraulic actuator;an electrically operated valve controlling flow of the pressurized hydraulic fluid to the actuator;means for determining the position and direction of rotation of the crankshaft from the electrical outputs of the crankshaft position sensor; andan engine control unit generating electrical pulses for controlling the electrically operated valve.