Patent ID: 7308872

Claim:
An internal combustion engine using compression ignition having an intake valve camshaft and an exhaust valve camshaft, comprising: a) a plurality of cylinders; b) first and second intake valves for each of said cylinders; c) first and second exhaust valves for each of said cylinders; d) a variable valve actuator including a two-step roller finger follower for each of said intake and exhaust valves, said variable valve actuator being used for varying the opening and closing timing of each of said intake and exhaust valves during a combustion cycle of said engine operation; e) a two-step camshaft lobe for each of said two-step roller finger followers, said two-step camshaft lobes being disposed on at least one of said camshafts; f) a first intake oil control valve for controlling the actuation of two-step roller finger followers for said first intake valves; g) a second intake oil control valve for controlling the actuation of two-step roller finger followers for said second intake valves; h) a first exhaust oil control valve for controlling the actuation of roller finger followers for said first exhaust valves; i) a second exhaust oil control valve for controlling the actuation of roller finger followers for said second exhaust valves; and j) at least one cam phaser for varying the opening and closing timing of at least one of said first and second intake valves or said first and second exhaust valves during a combustion cycle of said engine operation, wherein operating parameters characteristic of said engine using compression ignition may be varied to improve engine performance and fuel efficiency over a plurality of Operating Modes.