Patent ID: 6125828
Filing Date: 2000-10-03
Classification: F01L

Abstract:
An internal combustion engine comprising:at least one engine cylinder exhaust valve which is selectively opened and closed;a cam having a plurality of lobes synchronized with possible openings of said at least one engine cylinder valve, wherein said plurality of lobes include a exhaust lobe, a compression release lobe and an exhaust gas recirculation lobe, and wherein said hydraulic fluid control is responsive to an engine operating mode;a hydraulic linkage containing hydraulic fluid operatively coupled between said cam and said at least one engine cylinder valve for selectively responding to said lobes by causing said at least one valve to open; anda hydraulic fluid control assembly for selectively controlling hydraulic fluid pressure in said hydraulic linkage to selectively modify the openings of said at least one engine cylinder valve in response to said lobes, said hydraulic fluid control being selectively operable to allow said at least one engine cylinder valve to remain completely closed in response to any first one of said lobes and to open in response to any second one of said lobes.