A lift regulator for a variable lift valve gear has a cam contour arranged around an axis of rotation of the lift regulator for deflecting a lift adjustment of the valve gear on rotation of the lift regulator about the axis of rotation. The cam contour has a region deflecting from a resting position, a changeover region, and a region deflecting back to the resting position. A variable lift valve gear and a method for operating the variable lift valve gear are disclosed.

A first swing arm of each cylinder is swung by a fixed cam of an intake camshaft, so as to operate a first intake valve according to a profile thereof. A second swing arm is swung by a second cam and its swing range is changed by a variable mechanism. Hereby, a lift amount of a second intake valve changes continuously. The second cam is selected from a plurality of cams on a cam piece provided around the intake camshaft.

A control shaft of a cam shaft adjustment unit has axially spaced adjustment cams, which are designed in a first axial section of the control shaft for a continuous operation of a cylinder and in a second axial section for a cylinder shut-off. The adjustment cams for the continuous operation of a cylinder have, over the entire circumference of the cam circle, a radial extension which is greater than a zero stroke extension and the adjustment cams for the cylinder shut-off have, around their circumference, a shut-off section of the cam circle with a radial extension which is less than or equal to the zero stroke extension. The control shaft has a stop that reduces the rotation in both circumferential directions and functions as the calibration point for an engine electronics system.

A device for adjusting a camshaft of an internal combustion engine, comprising a lifting profile assembly (10) which is provided in a rotationally fixed manner on or at an axially movably mounted camshaft, and which forms a control groove (12), having a groove depth that varies along a direction of rotation, and comprising actuating means (FIG. 4) which are designed to cause an axial movement by controlled engaging in the control groove, and which have an electromagnetically drivable tappet unit (P1, P2), wherein the tappet unit cooperates with the control groove in such a way that, when rotating, same can exert a reset- or driver effect on the tappet unit in a predetermined groove section, characterized in that the tappet unit has at least two neighbouring and preferably axially parallel individual tappets (P1, P2), said tappets being independently drivable, the control groove, designed to engage using a first of the individual tappets (P2), forms a radially peripheral wall at least along a peripheral groove side in such a way that a neighbouring second of the individual tappets (P1) is positioned outside the control groove during rotation, and outside the control groove (12), and the lifting profile assembly is provided with a radially height-variable and/or ramp section (20) for cooperating with the second individual tappet, in such a way that a resetting and/or driving of the second individual tappet (P1) is caused when the first individual tappet (P2) is reset or driven against a tappet drive direction using the control groove.

A variable-lift valve train for a gas exchange valve of an internal combustion engine includes a lift adjuster, a lift actuator, and a lift lever. The lift adjuster has a working curve that is arrangeable at least in a first working position for setting a partial lift and in a second working position for setting a maximum lift. The working curve has a lift region and a base circle region. The lift actuator, which has an actuating contour configured to deflect the lift adjuster. The lift lever, which is deflectable via the working curve and thereby actuates a lift of the gas exchange valve. The valve train is configured to, in the first working position and in the second working position, actuate the gas exchange valve with an at least substantially equal maximum valve acceleration.

A hybrid vehicle includes a controller that executes catalyst warm-up control for warming up a catalyst, including first control that operates an internal combustion engine at a first operating point, and second control, after executing the first control, that operates the engine at a second operating point irrespective of driving force required to propel the vehicle. Engine output at the second point is larger than engine output at the first point. Ignition timing of the engine at the time when the first control is executed is controlled to a retarded side with respect to an ignition timing of the engine at the time when the second control is executed. When the second control is executed, at least one of a valve lift of an intake valve and a valve operating angle of the intake valve increases as charging of an electrical storage device is more limited.

An internal combustion engine includes a cylinder block that defines a cylinder and a cylinder head mounted to the cylinder block. A reciprocating piston is arranged inside the cylinder for compressing an air and fuel mixture at a geometric compression ratio of at least 10:1. A crankshaft is arranged in the cylinder block and rotated by the piston. An intake valve is operatively connected to the cylinder head and controls delivery of air to the cylinder for combustion therein. A mechanism provides a constant peak lift of the intake valve over an angle of rotation of the crankshaft that is at least 5 degrees, i.e., an extended dwell at peak lift. A multi-stage boosting system having first and second gas compressors is selectively controlled to pressurize air that is received from the ambient for delivery to the cylinder. A vehicle having such an engine is also disclosed.

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.

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.

Methods and systems are provided for reducing idling torque imbalances between cylinders by actuating a common camshaft to which the cylinders are coupled. The camshaft may be adjusted within camshaft limits during each combustion event of each cylinder. In this way, idling NVH issues may be addressed.