Abstract: An apparatus and method for controlling deactivation of cylinders in an engine may include a sensor that measures pressure inside an intake manifold of the engine, an oil control valve (OCV) that deactivates the cylinders in the engine, and a controller that is configured to control the OCV to deactivate a specific cylinder in the engine, based on the pressure inside the intake manifold.

Abstract: An apparatus and method for controlling deactivation of cylinders in an engine may include a sensor that measures pressure inside an intake manifold of the engine, an oil control valve (OCV) that deactivates the cylinders in the engine, and a controller that is configured to control the OCV to deactivate a specific cylinder in the engine, based on the pressure inside the intake manifold.

Abstract: A variable valve control system may include a variable valve mechanism having latching pins for performing variable valve lift by a pressure difference of oil, an oil control circuit block having a low-pressure oil line and a high-pressure oil line to control ON/OFF of the latching pins, and a rotation shaft valve having oil passages for switching the low-pressure oil line and the high-pressure oil line.

Abstract: A system for controlling a variable valve apparatus may include a plurality of oil control valves (OCVs) configured to respectively supply oil from an oil pump to a plurality of variable valve apparatuses or block the supply of the oil, and a single relief valve coupled to the plurality of oil control valves, wherein pressure in a plurality of control galleries for providing an oil supply path from the plurality of oil control valves to the plurality of variable valve apparatuses is maintained constant by only the single relief valve.

Abstract: A system for controlling a variable valve apparatus may include a plurality of oil control valves (OCVs) configured to respectively supply oil from an oil pump to a plurality of variable valve apparatuses or block the supply of the oil, and a single relief valve coupled to the plurality of oil control valves, wherein pressure in a plurality of control galleries for providing an oil supply path from the plurality of oil control valves to the plurality of variable valve apparatuses is maintained constant by only the single relief valve.

Abstract: A variable valve control system may include a variable valve mechanism having latching pins for performing variable valve lift by a pressure difference of oil, an oil control circuit block having a low-pressure oil line and a high-pressure oil line to control ON/OFF of the latching pins, and a rotation shaft valve having oil passages for switching the low-pressure oil line and the high-pressure oil line.

Abstract: A variable valve lift apparatus that changes a lift of a valve in an engine may include: an outer body; an inner body; a cam contact portion disposed in the second space, rotatably connected to the inner body, and contacting the cam so that the inner body makes a lever motion according to rotation of the cam; a connecting shaft disposed and the one end of the inner body and connect the outer body with the inner body; and a lost motion spring, wherein the inner body is selectively fixed to the outer body or is selectively released from fixing with the outer body, and both ends of the connecting shaft protrude to both sides in the width direction of the outer body and a valve contact portion, which contacts a valve, is formed at the both ends.

Abstract: A variable valve lift apparatus to vary lift of a valve disposed at an engine may include an outer body selectively making a lever motion according to rotation of a cam, being adapted such that the valve is connected with one end thereof and a pivot axis of the lever motion is disposed at another end thereof, and forming an inside space, an inner body disposed in the inside space of the outer body and adapted such that one end thereof is rotatably connected with the one end of the outer body, a connecting shaft disposed so as to penetrate the one end of the outer body and the one end of the inner body and connect the outer body with the inner body, and a lost motion spring provided so as to return the inner body which is relatively rotated with the outer body around the connecting shaft.

Abstract: A variable valve lift apparatus that changes a lift of a valve in an engine may include an outer body selectively pivoting based on rotation of a cam, having a first end configured to be connected with a valve and a second end mounted with a pivot shaft, and having an internal space formed in the outer body, an inner body pivoting based on rotation of the cam, disposed in the internal space of the outer body, and having a first end rotatably connected to the first end of the outer body, a connecting shaft disposed through the first end of the outer body and the first end of the inner body and connecting the outer body and the inner body to each other, and a lost motion spring having a portion fixed to the outer body and another portion fixed to the inner body.

Abstract: A variable compression ratio engine may include a variable chamber housing communicated with a combustion chamber of the engine, a variable chamber piston slidably disposed within the variable chamber housing, forming a variable chamber communicated with the combustion chamber within the variable chamber housing, forming a hydraulic pressure chamber between the variable chamber piston and the variable chamber housing, and having a leaking line for flowing oil leaked from the hydraulic pressure chamber, a connecting shaft connected to the variable chamber piston, and having an oil drain line for exhausting the oil in the leaking line is formed thereto, an oil supplier supplying oil to the hydraulic pressure chamber, and a compression ratio controller connected to the connecting shaft and controlling a relative position of the variable chamber piston.

Abstract: A variable valve lift apparatus may include: an outer body selectively making a lever motion according to rotation of a cam, a first inner body disposed in the any one inside space of the outer body and adapted, a second inner body disposed in the other one inside space of the outer body, a connecting shaft disposed to penetrate the one end of the outer body, the one end of the first inner body, and the one end of the second inner body and connect the outer body with the first and second inner bodies, a first lost motion spring to return the first inner body relatively rotated with the outer body around the connecting shaft, and a second lost motion spring to return the second inner body relatively rotated with the outer body around the connecting shaft.

Abstract: A variable valve lift apparatus may include an outer body, an inner body inserted in the outer body to move up and down in the outer body, a valve cylinder inserted in the outer body on a lower side of the inner body to have one side coupled to the inner body and the other side coupled to the valve, a latching member provided either to the outer body or to the inner body to be operated by a hydraulic pressure for coupling to the outer body and the inner body selectively, a hydraulic chamber formed between the outer body and the inner body, a latching flow passage formed in the outer body to supply the hydraulic pressure to the latching member, and an oil removal valve provided to drain a fluid.

Abstract: A variable valve lift apparatus that changes a lift of a valve in an engine may include: an outer body; an inner body; a cam contact portion disposed in the second space, rotatably connected to the inner body, and contacting the cam so that the inner body makes a lever motion according to rotation of the cam; a connecting shaft disposed and the one end of the inner body and connect the outer body with the inner body; and a lost motion spring, wherein the inner body is selectively fixed to the outer body or is selectively released from fixing with the outer body, and both ends of the connecting shaft protrude to both sides in the width direction of the outer body and a valve contact portion, which contacts a valve, is formed at the both ends.

Abstract: A variable compression ratio engine includes a variable chamber housing in fluidic communication with a combustion chamber of the engine, a chamber plunger slidably disposed within the variable chamber housing and forming a variable chamber together with the variable chamber housing, a hydraulic pressure cylinder connected with the variable chamber housing, a hydraulic piston slidably disposed within the hydraulic pressure cylinder, having a slider protruded to form first and second operation chambers with the hydraulic pressure cylinder and connected with the chamber plunger, a control plunger connected with the hydraulic piston, a control cylinder for receiving the control plunger and slidable with respect to the control plunger, a compression ratio control portion selectively moving the control cylinder along the length direction, and hydraulic pressure lines supplying control hydraulic pressure to the first or second operation chamber or releasing the control hydraulic pressure from the first or second op

Abstract: A variable valve device for varying a lift amount of a valve includes a first valve and a second valve that are respectively disposed to open or close a port, a swing arm in which first and second valve pressing portions are formed at both sides to press the first valve and the second valve, one supporting portion that supports a part that is apart from the first and the second valve pressing portions on the swing arm, a lost body that is rotatably disposed on the swing arm through a lost pin, a camshaft on which a first cam and a second cam are formed to respectively press the lost body and the swing arm, and a latching pin that selectively fixes the swing arm with the lost body and is disposed to move in a direction that the first and the second valves are arranged.

Abstract: A variable valve lift apparatus operated to change lift of a valve provided to an engine may include an outer body having an inside space formed therein, an inner body arranged in the inside space of the outer body, the inner body being selectively secured to the outer body to make a lever motion centered on a lever motion pivot shaft together with the outer body as a cam rotates, a connection shaft arranged to pass through the first end of the outer body and the first end of the inner body to connect the outer body to the inner body, a lost motion spring provided to return the inner body rotated relative to the outer body centered on the connection shaft to an original position, and a latching device provided to the outer body for selectively securing the inner body to the outer body.

Abstract: A variable valve lift apparatus may include: an outer body selectively making a lever motion according to rotation of a cam, a first inner body disposed in the any one inside space of the outer body and adapted, a second inner body disposed in the other one inside space of the outer body, a connecting shaft disposed to penetrate the one end of the outer body, the one end of the first inner body, and the one end of the second inner body and connect the outer body with the first and second inner bodies, a first lost motion spring to return the first inner body relatively rotated with the outer body around the connecting shaft, and a second lost motion spring to return the second inner body relatively rotated with the outer body around the connecting shaft.

Abstract: A cylinder deactivation engine may include: one or more deactivation cylinders to be selectively deactivated; one or more non-deactivation cylinders not to be deactivated; cylinder deactivation apparatuses operably connected to the deactivation cylinders and operated by hydraulic pressure to selectively implement a zero lift of a valve or valves of the deactivation cylinders; one or more variable valve lift apparatuses operably connected to the non-deactivation cylinders and operated by the hydraulic pressure to selectively change a lift of a valve of the non-deactivation cylinders; a hydraulic pump that generates the hydraulic pressure for operating the variable valve lift apparatuses and the cylinder deactivation apparatuses; and one or more oil control valves that control the hydraulic pressure from the oil pump so that the hydraulic pressure is selectively supplied to the variable valve lift apparatuses and the cylinder deactivation apparatuses.

Abstract: A variable valve lift apparatus to vary lift of a valve disposed at an engine may include an outer body selectively making a lever motion according to rotation of a cam, being adapted such that the valve is connected with one end thereof and a pivot axis of the lever motion is disposed at another end thereof, and forming an inside space, an inner body disposed in the inside space of the outer body and adapted such that one end thereof is rotatably connected with the one end of the outer body, a connecting shaft disposed so as to penetrate the one end of the outer body and the one end of the inner body and connect the outer body with the inner body, and a lost motion spring provided so as to return the inner body which is relatively rotated with the outer body around the connecting shaft.

Abstract: A variable valve lift apparatus that changes a lift of a valve in an engine may include an outer body selectively pivoting based on rotation of a cam, having a first end configured to be connected with a valve and a second end mounted with a pivot shaft, and having an internal space formed in the outer body, an inner body pivoting based on rotation of the cam, disposed in the internal space of the outer body, and having a first end rotatably connected to the first end of the outer body, a connecting shaft disposed through the first end of the outer body and the first end of the inner body and connecting the outer body and the inner body to each other, and a lost motion spring having a portion fixed to the outer body and another portion fixed to the inner body.