Abstract: A method for controlling intake and exhaust valves of an engine includes: controlling, by an intake continuous variable valve timing (CVVT) device and an exhaust CVVT device, opening and closing timings of the intake valve and exhaust valves; determining, by a controller, a target opening duration of the intake and exhaust valves based on an engine load and an engine speed; modifying, by an intake continuous variable valve duration (CVVD) device and by an exhaust two-stage variable valve duration device, current opening and closing timings of the intake valve and exhaust valve based on the target opening durations. In particular, the exhaust two-stage VVD device switches a current opening duration of the exhaust valve to a first exhaust opening duration or a second exhaust opening duration which is shorter than the first opening duration based on the target opening duration of the exhaust valve.

Abstract: A method for controlling intake and exhaust valves of an engine may include: determining, by a controller, a target opening duration of the intake and exhaust valves based on an engine load and an engine speed; modifying, by an intake continuous variable valve duration (CVVD) device and by an exhaust CVVD device, current opening and closing timings of the intake valve and/or exhaust valve based on the target opening duration of the valves; and advancing or retarding, by the intake and/or exhaust CVVD devices, the current opening timing of the intake and exhaust valves while simultaneously retarding or advancing the current closing timing of the intake and exhaust valve by a predetermined value based on the target opening duration.

Abstract: A method for controlling intake and exhaust valves of an engine includes: Controlling opening and closing timings of the intake and exhaust valves by an intake continuous variable valve timing (CVVT) device and an exhaust CVVT devices; determining, by a controller, target intake and exhaust opening durations of the intake and exhaust valves, and target opening and closing timings of the valves based on an engine load and an engine speed; modifying current intake and exhaust opening durations based on the target opening durations via an intake continuous variable valve duration (CVVD) device and an exhaust CVVD device; adjusting opening or closing timings of the valves to the target opening or closing timings of the valves while maintaining the modified opening durations of the valves.

Abstract: A method for controlling intake and exhaust valves of an engine includes: controlling, by an intake continuous variable valve timing (CVVT) device, opening and closing timings of the intake valve; controlling, by an exhaust CVVT device, opening and closing timing of the exhaust valve; determining, by a controller, first to fifth control regions based on engine load and speeds, and a target opening duration of the intake valve and target opening or target closing timings of the intake valve; modifying, by an intake continuous variable valve duration (CVVD) device, current opening and closing timings of the intake valve based on the target opening duration; and advancing or retarding, by the intake CVVD device, the current opening timing of the intake valve while simultaneously retarding or advancing the current closing timing of the intake valve by a predetermined value based on the target opening duration of the intake valve.

Abstract: A method for controlling intake and exhaust valves of an engine includes: controlling, by an intake continuous variable valve timing (CVVT) device, opening and closing timings of the intake valve; controlling, by an exhaust CVVT device, opening and closing timing of the exhaust valve; determining, by a controller, a target opening duration of the intake valve and target opening or target closing timings of the intake valve based on an engine load and an engine speed; modifying, by an intake continuous variable valve duration (CVVD) device, current opening and closing timings of the intake valve based on the target opening duration; and advancing or retarding, by the intake CVVD device, the current opening timing of the intake valve while simultaneously retarding or advancing the current closing timing of the intake valve by a predetermined value based on the target opening duration of the intake valve.

Abstract: The present disclosure provides a system and a method for controlling valve timing of a continuous variable valve duration. The method may include: classifying a plurality of control regions depending on an engine speed and an engine speed; applying a maximum duration to an intake valve in a first control region; maintaining the maximum duration of the intake valve and controlling the exhaust valve to reach a maximum duration in a second control region; advancing intake valve closing (IVC) timing and exhaust valve closing (EVC) timing in a third control region; controlling the IVC timing to be close to bottom dead center (BDC) 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 controlling the throttle valve to be fully opened and advancing the IVC timing in a sixth control region.

Abstract: An exhaust heat recovery system may include an exhaust pipe through which exhaust gas exhausted from an engine moves, a main channel through which a working fluid moves, a turbine rotated by the working fluid exhausted from the main channel to generate energy, an exhaust gas recirculation (EGR) line circulating a portion of the exhaust gas exhausted from the engine to an intake manifold, and channel control valves disposed in the main channel and configured to control movement of the working fluid so that the exhaust gas moving along the EGR line and the working fluid moving along the main channel exchange heat with each other.

Abstract: A continuous variable valve duration apparatus may include a camshaft, a first cam portion and a second cam portion of which a cam is formed thereto respectively, of which the camshaft is inserted thereto, of which relative phase angles with respect to the camshaft are variable, and the first and second cam portions disposed on one cylinder and the next cylinder respectively, a first inner bracket and a second inner bracket transmitting rotation of the camshaft to the first and second cam portions respectively, a slider housing of which the first and second inner brackets are rotatably inserted thereto and of which relative position with respect to the camshaft is variable and a control portion selectively changing the relative position of the slider housing.

Abstract: A continuously variable valve timing apparatus may include a camshaft, a plurality of wheels mounted to the camshaft, of which a wheel key is formed thereto respectively, a plurality of cam portions of which a cam and a cam key are formed thereto respectively, of which the camshaft is inserted thereto, of which relative phase angle with respect to the camshaft is variable, a plurality of inner brackets connected with the each wheel key and the each cam key, a plurality of a slider housings of which the each inner bracket is rotatably inserted thereto respectively, and rotatably configured around a hinge hole formed an upper side of a cam cap and a control portion selectively moving the slider housings to change relative position of a rotation center of the inner brackets.

Abstract: Methods and devices are provided for controlling an engine provided with a continuously variable valve timing (CVVT) device disposed on an intake valve side, and with a continuous variable valve duration (CVVD) device and a continuously variable valve timing (CVVT) disposed on an exhaust valve side according to an exemplary form of the present disclosure. A method may include classifying a plurality of control regions depending on an engine speed and an engine load, and based upon which of the plurality of control regions is a control region of the engine, controlling opening and closing timing of the intake valve, controlling opening and closing timing of the exhaust valve, and controlling open duration of the exhaust valve.

Abstract: A continuously variable valve lift apparatus may include a camshaft, a cam portion on which a cam is formed and into which the camshaft is inserted, a slider housing into which the cam portion is rotatably inserted and of which a position is rotatable around a pivot shaft, a control portion engaged with the slider housing and configured to selectively rotate the slider housing around the pivot shaft, an output portion rotatable around the pivot shaft, contacting the cam and onto which a valve shoe is formed, and a valve device contacting the valve shoe and driven by rotation of the cam.

Abstract: A method for controlling valve timing for an engine includes: classifying a plurality of control regions depending on an engine speed and an engine load; applying a maximum duration to an intake valve and controlling an exhaust valve to limit a valve overlap in a first region; controlling the intake valve and the exhaust valve to maintain the maximum duration in a second region; advancing an intake valve closing (IVC) timing and an exhaust valve closing (EVC) timing in a third region; approaching the IVC timing to a bottom dead center (BDC) in a fourth region; controlling a throttle valve to be fully opened, advancing an intake valve opening (IVO) timing before a top dead center (TDC), and controlling the IVC timing to be a predetermined value after the BDC in a fifth region; and controlling the throttle valve to be fully opened and advancing the IVC timing in a sixth region.

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 system and a method for controlling valve timing of a continuous variable valve duration engine including classifying control regions depending on engine speed and load; applying a maximum duration to an intake valve and a long duration to an exhaust valve and limiting an overlap; applying the maximum duration to the intake valve and the long duration to the exhaust valve, and adjusting the overlap according to the engine load; applying the long duration to the exhaust valve, fixing an exhaust valve open timing and an exhaust valve close timing, and advancing an intake valve close timing according to an increase of engine load; controlling a wide open throttle valve and applying a short duration to the exhaust valve; and controlling a wide open throttle valve, applying the long duration to the exhaust valve, delaying the intake valve close timing according to an increased engine speed.

Abstract: A continuously variable valve lift apparatus may include a camshaft, a cam portion on which a cam is formed and into which the camshaft is inserted, a slider housing into which the cam portion is rotatably inserted and a position thereof is rotatable around a pivot shaft, a control portion configured to selectively push the slider housing to be rotated, a spring guide connected to the slider housing for elastically supporting the slider housing, a rotation deliverer configured to transmit rotation of the camshaft to the cam portion, an output portion rotatable around the pivot shaft and onto which a valve shoe is formed, and a valve unit configured to be driven by the valve shoe.

Abstract: The method for controlling valve timing of an engine includes: classifying control regions; applying a maximum duration to an intake valve and a long duration to an exhaust valve in a first control region; advancing Intake Valve Closing timing, applying the long duration to the exhaust valve, and maintaining a maximum valve overlap in a second control region; applying the long duration to the exhaust valve and advancing the IVC timing and Exhaust Valve Closing timing in a third control region; applying a short duration to the exhaust valve and controlling the EVC timing in a fourth control region; controlling a throttle valve, applying the short duration to the exhaust valve, and retarding Exhaust Valve Opening timing in a fifth control region; and controlling the throttle valve and the EVC timing, applying the long duration to the exhaust valve, advancing the EVO timing in a sixth control region.

Abstract: A method for controlling valve timing of an engine includes: classifying control regions depending on an engine speed and an engine load, and applying a maximum duration to an intake valve and controlling a valve overlap in the first control region; advancing an intake valve closing (IVC) timing and applying the maximum duration to the exhaust valve in the second control region; advancing both the IVC timing and an exhaust valve closing (EVC) timing in the third control region; fixing an exhaust valve opening (EVO) timing and approaching the EVC timing to a top dead center (TDC) in the fourth control region; controlling a wide open throttle valve (WOT) and retarding the EVO timing in the fifth control region; and controlling the WOT, advancing the EVO timing, and approaching the EVC timing to the TDC in the sixth control region.

Abstract: A continuously variable valve lift apparatus may include a camshaft, a cam portion on which two rotation portions are formed, on which a cam is formed between the two rotation portions and into which the camshaft is inserted, two slider housings into which each rotation portion is rotatably inserted therein, of which a position is moved for changing a relative position of the cam portion with respect to the camshaft and onto which a guide slot is formed, a control portion configured to selectively move the position of each of the two slider housings, a guide shaft 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 onto 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 on which a cam is formed and into which the camshaft is inserted, a slider housing into which the cam portion is rotatably inserted and disposed to be rotatable around a pivot shaft, a control portion configured to selectively rotate the slider housing around the pivot shaft, a rotation deliverer configured to transmit rotation of the camshaft to the cam portion, an output portion 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 continuous variable valve duration apparatus may include a camshaft, first and second cam portions, of which the camshaft is inserted thereto, of which relative phase angles with respect to the camshaft are variable, a first and a second inner brackets transmitting rotation of the camshaft to the first and second cam portions respectively, a slider housing of which the first and second inner brackets are rotatably inserted thereto, of which relative position with respect to the camshaft is variable and of which a guide protruded portion is formed to an upper side thereof, cam caps of which each cam cap engaging portion is rotatably connected thereto, a connecting bracket connecting the cam caps and of which a guide slot for the guide protruded portion to be inserted thereto is formed thereto and a control portion selectively changing a position of the slider housing.