Abstract: The disclosure relates to a method for operating a reciprocating piston engine having a valve controller, the method comprising five operating phases (Ph1, Ph2, Ph3, Ph4, Ph5), namely a regular combustion engine operation (Ph1), an overrun operation (Ph2), a shutdown process (Ph3), a restart (Ph4), as well as a transition back to the combustion engine operation (Ph5). During the transition to the overrun operation, a drag torque of the reciprocating piston engine is reduced by adjusting the valve controller. During the shutdown, the drag torque is increased. In the course of the restart that interrupts the shutdown process, the drag torque is temporarily reduced.

Abstract: The disclosure relates to a method for operating an internal combustion engine. The internal combustion includes an intake manifold via which a cylinder can be supplied with fresh air, an inlet valve via which, when it is open, the fresh air can flow from the intake pipe into the cylinder, and a variable valve drive by means of which the opening duration or the relative timing of the inlet valve event is variable in relation to a crankshaft position. During a starting of the internal combustion engine, when the intake manifold pressure differs from the intake manifold desired pressure, a filling pilot control of the cylinder is undertaken by the variable valve drive by the fresh air supply being reduced in comparison to the fresh air supply at the intake manifold desired pressure. The disclosure further relates to a control device for an internal combustion engine that enables low-emission operation.

Abstract: The disclosure relates to a method for operating a reciprocating piston engine having a valve controller, the method comprising five operating phases (Ph1, Ph2, Ph3, Ph4, Ph5), namely a regular combustion engine operation (Ph1), an overrun operation (Ph2), a shutdown process (Ph3), a restart (Ph4), as well as a transition back to the combustion engine operation (Ph5). During the transition to the overrun operation, a drag torque of the reciprocating piston engine is reduced by adjusting the valve controller. During the shutdown, the drag torque is increased. In the course of the restart that interrupts the shutdown process, the drag torque is temporarily reduced.

Abstract: The invention relates to a hydraulic camshaft adjuster (1) having a stator (2), a rotor (3) rotatable relative to the stator (2) within a limited angular range, and a hydraulic supply (4) having two working channels (5, 6) and a shifting valve (7), wherein the two working channels (5, 6) for adjusting the rotor (3) relative to the stator (2) in two opposite directions of action can be connected to a pump (10) for pressurisation or to a reservoir (11) for pressure relief, depending on the shifting position (8, 9) of the shifting valve (7), wherein the hydraulic supply (4) has a return pump (12) that can be actuated by displacing the shifting valve (7) between its shifting positions (8, 9) and by the actuation of which one of the two work-ing channels (6) can be pressurised for returning the rotor (3) into a predetermined position.

Abstract: A hydraulic camshaft adjuster having a stator, a rotor rotatable relative to the stator within a limited angular range, and a hydraulic supply having two working channels and a shifting valve. The two working channels or adjusting the rotor relative to the stator in two opposite directions of action can be connected to a pump for pressurization or to a reservoir for pressure relief, depending on a shifting position of the shifting valve. The hydraulic supply has a return pump hat can be actuated by displacing the shifting valve between its shifting positions and by the actuation of which one of the two working channels can be pressurized for returning the rotor into a predetermined position.

Abstract: The disclosure relates to a method for operating an internal combustion engine. The internal combustion includes an intake manifold via which a cylinder can be supplied with fresh air, an inlet valve via which, when it is open, the fresh air can flow from the intake pipe into the cylinder, and a variable valve drive by means of which the opening duration or the relative timing of the inlet valve event is variable in relation to a crankshaft position. During a starting of the internal combustion engine, when the intake manifold pressure differs from the intake manifold desired pressure, a filling pilot control of the cylinder is undertaken by the variable valve drive by the fresh air supply being reduced in comparison to the fresh air supply at the intake manifold desired pressure. The disclosure further relates to a control device for an internal combustion engine that enables low-emission operation.