Continuous variable valve duration apparatus and control method using the same
AssigneeHyundai Motor Company
InventorsKiyoung Kwon, Ingee Suh, Kyoung Pyo Ha, In Sang Ryu, Back Sik Kim
Life of this patent
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Abstract
A control method using a continuous variable duration apparatus provided to adjust opening duration of an intake valve of an engine includes: determining a reduction amount of a compression ratio to prevent knocking, when knocking of an engine is expected, setting a desired effective compression ratio required for the reduction amount of the effective compression ratio, setting desired duration for the set desired effective compression ratio, and controlling duration of the intake valve on the basis of the set desired duration.
Claims10
A continuous variable duration apparatus comprising:
- a plurality of wheels that are mounted on a camshaft, wherein each wheel includes a wheel key and corresponds to cylinders, respectively;
- a plurality of cam devices, wherein each of the cam devices includes cams and a cam key, and the camshaft is inserted into the cams, and wherein the cam devices have variable relative phases of the cams with respect to the camshaft and corresponding to the cylinders, respectively;
- a plurality of inner brackets that are connected to the wheel key and the cam key;
- a plurality of slider housings in which the inner brackets are rotatably inserted, wherein the slider housings are selectively movable vertically with respect to the engine;
- a controller that adjusts positions of rotational centers of the inner brackets by changing positions of the slider housings;
- and
- a guide device that guides the slider housings, wherein a compression ratio of the engine is controlled by controlling duration of a valve by adjusting the relative phases of the cams, wherein control teeth are formed on a side of each of the slider housings, and wherein the controller includes:
- a control shaft that is in parallel with the camshaft and has control gears engaged with the control teeth;
- and an actuator that selectively rotates the control shaft.
A control method using a continuous variable duration apparatus provided to adjust opening duration of an intake valve of an engine, the method comprising:
- determining, by a controller, a reduction amount of a compression ratio to prevent knocking, when the knocking of the engine is expected;
- setting, by the controller, a desired compression ratio required for the reduction amount of the compression ratio;
- setting, by the controller, a desired opening duration for the set desired compression ratio;
- and
- controlling, by the controller, the opening duration of the intake valve on a basis of the set desired opening duration,
- wherein the continuous variable duration apparatus includes:
- a plurality of wheels that are mounted on a camshaft, wherein each wheel includes a wheel key and corresponds to cylinders, respectively;
- a plurality of cam devices, wherein each of the cam devices includes cams and a cam key, and the camshaft is inserted into the cams, and wherein the cam devices have variable relative phases of the cams with respect to the camshaft and corresponding to the cylinders, respectively;
- a plurality of inner brackets that are connected to the wheel key and the cam key;
- a plurality of slider housings in which the inner brackets are rotatably inserted, wherein the slider housings are selectively movable vertically with respect to the engine;
- a controller that adjusts positions of rotational centers of the inner brackets by changing the positions of the slider housings;
- and
- a guide device that guides the slider housings,
- wherein a compression ratio of the engine is controlled by controlling duration of a valve by adjusting the relative phases of the cams.
Dependencies are inferred from the claim text.