Patent ID: 9617925
Date: 2017-04-11
CPC Classifications: F01L,F02D,Y02T

Claim:
1. A control method using a continuous variable valve duration apparatus which comprises a wheel being mounted on a camshaft and having a wheel key to control duration of an intake valve of an engine, a cam device having a cam and a cam key, being adapted that the camshaft is inserted thereinto, and being disposed to vary relative phase of the cam with respect to the camshaft, an inner bracket being connected with the wheel key and the cam key, a slider housing being adapted that the inner bracket is rotatably inserted thereinto and being disposed to move vertically with respect to the engine, a controller varying a position of the slider housing to adjust rotation center of the inner bracket, and guide device guiding motion of the sliding housing, the control method comprising: determining and learning a target effective compression ratio of the engine to prevent knocking by the controller when knocking of the engine is occurred; mapping an effective compression ratio of the engine in accordance with duration of the intake valve by the controller; setting a target valve duration for realizing the target effective compression ratio by the controller; and controlling duration of the intake valve according to the set target valve duration by the controller.