System for controlling continuously variable valve duration and operating method thereof
AssigneeHyundai Kefico Corporation
InventorsJin Wook Baek, Nam Kyu Kim
Life of this patent
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Abstract
A control system of a continuously variable valve duration (CVVD) is provided. A system for controlling a CVVD by adjusting an actuator for controlling the CVVD includes an electronic control unit (ECU) configured to output a command for adjusting the actuator based on a vehicle state and a cam position sensor is configured to measure a cam revolutions per minute (RPM). A controller is configured to calculate a crank RPM from the cam RPM when a failure occurs during communication with the ECU. A target phase angle is extracted based on the calculated crank RPM, and an electric current is output that corresponds to the extracted target phase angle to the actuator.
Claims8
A system for controlling a continuously variable valve duration (CVVD) by adjusting an actuator for controlling the CVVD, comprising:
- an electronic control unit (ECU) configured to output a command to adjust the actuator based on a vehicle state;
- a cam position sensor configured to measure a cam revolutions per minute (RPM);
- and
- a controller configured to calculate a crank RPM from the cam RPM when a failure occurs during communication with the ECU, extract a target phase angle based on the calculated crank RPM, and output an electric current corresponding to the extracted target phase angle to the actuator.
An operating method of a system for controlling a CVVD by a controller adjusting an actuator for controlling the CVVD according to a target phase angle originating from an ECU comprising:
- calculating, by the controller, a crank RPM from a cam RPM when a communication failure occurs between the ECU and the controller;
- extracting, by the controller, a target phase angle that corresponds to the calculated crank RPM from a control table;
- and
- outputting, by the controller, an electric current for adjusting the actuator on the basis of the extracted target phase angle.
Dependencies are inferred from the claim text.