Patent ID: 6267098
Filing Date: 2001-07-31
Classification: F01L

Abstract:
A valve actuation system having a slave piston for providing engine valve actuation motion, comprising:first and second hydraulic plungers; one or more cams for displacing said plunger out of phase;a slave piston;a hydraulic fluid supply;a hydraulic fluid system operatively connecting the first and second hydraulic plungers to both the slave piston and the hydraulic fluid supply;a first control valve positioned in the hydraulic fluid system to provide selective hydraulic communication of the first hydraulic plunger with the slave piston and the hydraulic fluid supply;a second control valve positioned in the hydraulic fluid system to provide selective hydraulic communication of the second hydraulic plunger with the slave piston and the hydraulic fluid supply; andmeans for controlling the hydraulic communication provided by the first and second control valves such that hydraulic connections provided by the hydraulic fluid system are selected from the group consisting of:(a) the first and second hydraulic plungers connected to the hydraulic fluid supply,(b) the first hydraulic plunger connected to the hydraulic fluid supply and the second hydraulic plunger connected to the slave piston,(c) the first hydraulic plunger connected to the slave piston and the second hydraulic plunger connected to the hydraulic fluid supply, and(d) the first and second hydraulic plungers connected to the slave piston.