Electronic active lock pin control method for middle phase type continuously variable valve timing system
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorSung-Joo Kim
Life of this patent
Estimating the term…
Abstract
An electronic active lock pin control method may include checking whether a default position of a lock pin is present, determining whether the checked default position of the lock pin is due to lock pin parking or limphome, entering the default position of the lock pin into an active mode at a time of the lock pin default position by the lock pin parking, while entering the default position of the lock pin into a passive mode at a time of the lock pin default position by the limphome, and performing a phase control mode to track the middle phase type CVVT target value after the passive mode or the active mode.
Claims6
An electronic active lock pin control method, comprising:
- (A) checking whether a default position of a lock pin is present, when a continuously variable valve timing (CVVT) controller detects a generation of a middle phase type CVVT target value;
- (B) determining whether the checked default position of the lock pin is due to lock pin parking or limphome;
- (C) entering the default position of the lock pin into an active mode in which a lock pin unlocking delay is solved by applying a control duty of a middle phase type oil-flow control valve (OCV) at a time of the lock pin default position by the lock pin parking, while entering the default position of the lock pin into a passive mode in which the lock pin unlocking delay is solved by not applying the control duty of the middle phase type OCV supplying oil to a lock pin unlocking oil chamber in which the lock pin is accommodated at a time of the lock pin default position by the limphome;
- and
- (D) performing a phase control mode to track the middle phase type CVVT target value after the passive mode or the active mode.
A middle phase type continuously variable valve timing system using an electronic active lock pin control method, comprising:
- left and right rotor channels provided in a continuously variable valve timing (CVVT) cam and continued to left and right lock pin oil chambers which are each formed left and right respectively, of a rotor moving by an action of an oil pressure;
- a lock pin unlocking channel continued to a lock pin unlocking oil chamber which accommodates the lock pin changed from locking to unlocking by the action of the supplied oil pressure and form lock pin unlocking branch channels which are branched and connected to the left and right rotor channels, respectively;
- an oil-flow control valve (OCV) producing an oil pressure in the left and right rotor channels, respectively;
- a middle phase type OCV producing the oil pressure in the lock pin unlocking channel;
- left and right channel shut-off valves mounted at a connected portion between the left and right rotor channels and the lock pin unlocking channel and opened by the oil pressure of the lock pin unlocking channel;
- and
- a CVVT controller applying a control duty to the OCV, dividing the control duty applied to the middle phase type OCV into a holding control duty and an opening control duty, and forming the oil pressure in the lock pin unlocking channel to open the left and right channel shut-off valves at a time of the holding control duty.
Dependencies are inferred from the claim text.