Patent ID: 7793624
Filing Date: 2010-09-14
Classification: F01L,F02D

Abstract:
1. A system for transferring engine valve actuation motion between first and second valve train elements, said system comprising: an actuator piston bore formed in the second valve train element; an actuator piston slideably disposed in the actuator piston bore; a solenoid control valve; a first hydraulic fluid supply passage connected to the solenoid control valve; a hydraulic circuit extending between the actuator piston bore and the solenoid control valve; a solenoid actuated valve disposed in said hydraulic circuit between the solenoid valve and the actuator piston bore; a means for expanding the volume of the hydraulic circuit during times when the solenoid control valve opens to provide hydraulic fluid from the first hydraulic fluid supply passage to the solenoid actuated valve; a bypass circuit included in the hydraulic circuit, the bypass circuit extending between the means for expanding and the actuator piston bore, and the bypass circuit extending around the solenoid actuated valve; and a first check valve disposed in the bypass circuit.