Patent ID: 9732679
Date: 2017-08-15
CPC Classifications: F01L,F02D,Y02T

Claim:
1. An engine for performing cylinder deactivation (CDA), the engine comprising: a plurality of cylinders; an intake camshaft; an intake CDA/variable valve duration apparatus that is provided in the intake camshaft to perform a general operation mode and a CDA mode of an intake valve of one cylinder of the plurality of cylinders and to perform a long duration mode and a short duration mode of an intake valve of a cylinder neighboring the one cylinder; a controller that controls operation of the intake CDA/variable valve duration apparatus according to an operation state of the engine; and a variable valve timing controller that varies valve timing of the intake valve of each cylinder, wherein the controller controls operation of the valve timing controller, and the controller delays timing of the intake valve by operating the intake CDA/variable valve timing controller when an operation state of the engine is changed to a predetermined high load state, in a state in which the intake CDA/variable valve duration apparatus operates to implement the CDA mode and the short duration mode of the intake valve, wherein the intake CDA/variable valve duration apparatus comprises: a first cam unit that can move in an axial direction of the intake camshaft on the intake camshaft and that rotates together with the intake camshaft, and in which a first long duration cam and a first short duration cam are formed at one side thereof and in which a first general cam and a first CDA cam are formed at another side thereof; a first solenoid that selectively moves the first cam unit in a first direction; a second cam unit that can move in the axial direction of the intake camshaft on the intake camshaft and that rotates together with the intake camshaft, and in which a second general cam and a second CDA cam are formed at one side thereof and in which a second long duration cam and a second short duration cam are formed at another side thereof; a second solenoid that selectively moves the second cam unit in a second direction; and an interlocking unit that is disposed between the first and second cam units and that is moved by movement of the first cam unit or the second cam unit to push the second cam unit or the first cam unit, wherein the controller controls operation of the first solenoid or the second solenoid according to an operation state of the engine.