초록 ▼

A valve actuation system for an internal combustion engine is disclosed. The system includes two hydraulic plungers (master pistons) that are selectively hydraulically coupled to a slave piston. The hydraulic motion from one of the hydraulic plungers may provide a valve opening motion to the slave p

A valve actuation system for an internal combustion engine is disclosed. The system includes two hydraulic plungers (master pistons) that are selectively hydraulically coupled to a slave piston. The hydraulic motion from one of the hydraulic plungers may provide a valve opening motion to the slave piston and the hydraulic motion from the other hydraulic plunger may provide a valve closing motion. The net hydraulic motion of both hydraulic plungers may be zero, so that when both plungers have hydraulic communication with the slave piston, no slave piston motion occurs. The system may provide full authority over all engine valve actuations, such as main intake, main exhaust, compression release, and exhaust gas recirculation.

대표청구항 ▼

[ What I claim is:] [1.]1. 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 operativel

[ What I claim is:] [1.]1. 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.