Continuously variable valve duration system and operating method thereof
AssigneeHyundai Kefico Corporation
InventorsJin Wook Baek, Lae Kyeom Kim
Life of this patent
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Abstract
A continuously variable valve duration (CVVD) system includes an electronic control unit (ECU) configured to output a command for adjusting an actuator and a controller configured to determine a operation range of a control shaft of the actuator and adjust the control shaft in the determined operation range based on the command of the ECU. The controller positions the control shaft at a predetermined target phase and determines a control state of each target phase based on a target phase value transmitted from the actuator when the control shaft is positioned at the target phase.
Claims16
A continuously variable valve duration (CVVD) system configured to operate a CVVD by adjusting an actuator configured to control the CVVD comprising:
- an electronic control unit (ECU) configured to output a command for adjusting the actuator;
- and
- a controller configured to determine a operation range of a control shaft of the actuator and adjust the control shaft in the operation range based on the command of the ECU, wherein
- the controller is configured to position the control shaft at a predetermined target phase and determines a control state of each target phase on the basis of a target phase value transmitted by the actuator when the control shaft is positioned at the target phase.
An operating method of a continuously variable valve duration (CVVD) system configured to control a CVVD by adjusting an actuator for operating the CVVD, comprising:
- determining, by a controller, a first restricted phase value in a operation range of a control shaft of the actuator based on a determining command;
- determining, by the controller, a control state of each target phase while sequentially positioning the control shaft at predetermined target phases in a first direction after determining the first restricted phase value;
- and
- determining, by the controller, a second restricted phase value in the operation range of the control shaft of the actuator after determining the control state of each of the target phases.
Dependencies are inferred from the claim text.