Abstract:
The present disclosure provides a system and a method for controlling valve timing of a continuous variable valve duration engine, including: classifying a plurality of control regions based on engine load and speed; applying a maximum duration to an intake valve and a long duration to an exhaust valve in a first control region; maintaining a maximum valve overlap in a second control region; advancing intake valve closing (IVC) timing and exhaust valve closing (EVC) timing in a third control region; applying a short duration to the exhaust valve and controlling the IVC timing to bottom dead center in a fourth control region; controlling a throttle valve to be fully opened, and controlling the IVC timing to an angle after BDC in a fifth control region; and applying the long duration to the exhaust valve, and controlling the IVC timing to prevent knocking in a sixth control region.
Abstract:
A method for controlling valve timing is provided for a turbo engine provided with a continuous variable valve duration(CVVD) device, a two stage variable valve duration device(VVD) and a continuous variable valve timing(CVVT) device. The method includes: classifying control regions; retarding an intake valve closing(IVC) timing and controlling an exhaust valve to limit a valve overlap in a first region; applying a maximum duration to an intake valve and applying a long duration to the exhaust valve in a second region; applying the long duration to the exhaust valve and advancing the IVC timing in a third region; controlling a throttle valve to be fully opened, applying a short duration to the exhaust valve and retarding an exhaust valve opening(EVO) timing in a fourth region; and controlling the throttle valve to be fully, applying the long duration to the exhaust valve and retarding the IVC timing in a fifth region.
Abstract:
The present disclosure provides a system and a method for controlling valve timing of continuous variable valve duration engine. The method includes: classifying control regions depending on engine speed and engine load; applying a maximum duration to an intake valve and controlling valve overlap between the intake valve and an exhaust valve in a first control region; applying the maximum duration to the intake valve and reducing the valve overlap by using exhaust valve closing (EVC) timing in a second control region; advancing intake valve closing (IVC) timing according to an increase of the engine load in a third control region; controlling a throttle valve to be fully opened and controlling the EVC timing to an angle after top dead center in a fourth control region; and controlling the throttle valve to be fully opened and controlling the IVC timing according to the engine speed in a fifth control region.
Abstract:
A continuous variable valve duration apparatus may include: a camshaft; first and second cam portions on which a cam is formed respectively, to which the camshaft is inserted and of which relative phase angles with respect to the camshaft are variable; first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively; a slider housing unit in which the first and second inner brackets are rotatably inserted and of which a relative positions with respect to the camshaft is variable; a control shaft parallel to the camshaft; a control rod eccentrically formed on the control shaft; a lifter on which a lifter hole and a rotation hole are formed; and a control portion selectively rotating the control shaft so as to controlling a position of the slider housing unit.
Abstract:
The present disclosure provides an engine with an oil supply system including a cam carrier in which a camshaft support hole is formed and in which an oil supply hole is formed to the camshaft support hole; a camshaft in which a camshaft oil line is formed, in which an inlet supplying oil from the cam carrier oil supply hole is formed and in which a first camshaft bifurcated line is formed; first and second cam portions on which cams are formed, of which the camshaft is inserted thereto, of which relative phase angles with respect to the camshaft are variable, disposed corresponding to a first and a second cylinders, and the first and second cam portions in which a cam portion oil line in fluid communication with first camshaft bifurcated line is formed.
Abstract:
A continuous variable valve duration apparatus may include: a camshaft; first and second cam portions on which a cam is formed respectively; first and second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively; a slider housing in which the first and the second inner brackets are rotatably inserted; first and second guiding portions formed on the slider housing; a cam cap on which a cam cap guide contacting the second guiding portion is formed; a control shaft parallel to the camshaft; a control rod eccentrically formed on the control shaft; a guide head on which a head guiding portion and a head hole are formed; a control portion selectively rotating the control shaft; and a stopper limiting movement of the guide head. The head guiding portion is connected to the first guiding portion, and the control rod is inserted into the head hole.
Abstract:
A continuously variable valve lift apparatus may include a camshaft, a cam portion on which two cams are formed and on which a rotation member is formed between the cams, a slider housing into which the rotation member is rotatably inserted, and rotatable around a pivot shaft, a control portion configured to selectively change a position of the slider housing, an output portion contacting the cams, rotatable around the pivot shaft and on which a valve shoe is formed, and a valve device configured to be driven by the valve shoe.
Abstract:
A continuously variable valve lift apparatus may include a camshaft, a cam portion of which a cam is formed thereto and the camshaft is inserted into therein, a slider housing of which the cam portion is rotatably inserted therein, of which a position with respect to the camshaft is movable and of which a guide slot is formed thereto, a control portion selectively changing the position of the slider housing, a guide shaft disposed parallel to the camshaft and inserted into the guide slot for guiding movement of the slider housing, an output portion rotatable around a pivot shaft and of which a valve shoe is formed thereto and a valve unit driven by the valve shoe.
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.
Abstract:
A method for controlling an EGR system includes determining whether diagnosis conditions for an EGR cooler are satisfied while the EGR system operates. The EGR system is turned off when the diagnosis conditions for the EGR cooler are satisfied and a retard amount of ignition timing is larger than a first reference value. The EGR cooler is diagnosed base on a comparison result of the retard amount of the ignition timing and a second reference value while the EGR system is off.