Continuously variable valve lift system including valve deactivation capability on one of two dual intake valves
View Patent ↗In a dual intake valve arrangement for an internal combustion engine, a continuously variable valve lift (CVVL) system controls two intake valves for one or more engine cylinders. In each cylinder, one of the intake valves includes an associated valve deactivation device, and the other intake valve does not. To improve in-cylinder air flow turbulence under low valve lift, one of the intake valves may be deactivated, resulting in mixture intake through only one valve, resulting in strong swirl by unbalanced flow. A CVVL-equipped engine including a valve deactivation device provides the same amount of air flow for the same engine load as a prior art CVVL engine. A method of introducing a swirl to the mixture is also described.
1. A system for variable actuation of first and second intake valves of a cylinder in an internal combustion engine having a camshaft, comprising:
a) a continuously variable valve lift system for variably transmitting motion of a camshaft lobe to said first and second valves; said continuously variable valve lift system including a rocker subassembly pivotable about a rocker subassembly shaft, a rocker subassembly positioning crank supporting a positioning shaft that is pivotably attached to said rocker subassembly, wherein rotation of said rocker subassembly positioning crank causes counter-rotation of said rocker subassembly shaft, thereby altering the angle at which said rocker subassembly contacts said camshaft; and
b) a valve deactivating device associated with only one of said first and second valves for selective activation and deactivation of said one valve.
2. A system in accordance with claim 1 wherein said valve deactivating device is a deactivation hydraulic lash adjuster.
3. A system in accordance with claim 1 wherein said valve deactivating device is a deactivating rocker arm.
4. A system in accordance with claim 3 wherein said deactivating rocker arm is a deactivating roller finger follower.
5. A system in accordance with claim 1 wherein control of said selective activation and deactivation of said one valve is independent of said continuously variable valve lift system.
6. An engine in accordance with claim 1 wherein said engine is selected from the group consisting of compression ignited and spark ignited.