Patent ID: 9540967
Date: 2017-01-10
CPC Classifications: F01L

Claim:
1. A method of preventing sticking of a CVVT locking-pin, the method comprising: a condition determining step that determines, by a determiner, whether a CVVT operation condition is satisfied in accordance with an engine condition; a locking-pin unlocking step that unlocks, by a controller, the CVVT locking-pin which is installed to a CVVT by applying an electric signal to a solenoid valve before the CVVT is operated; an unlocking determining step that determines, by the determiner, whether the CVVT locking-pin has been fully unlocked, by comparing a time lapsing from a point of time when an electric signal is applied to the solenoid valve with a standard value; and a CVVT operating step that operates, by the controller, the CVVT when the CVVT locking-pin has been fully unlocked.