Abstract: The invention relates to the operation of an internal combustion engine, a first model value or a second model value of the exhaust gas counter pressure is determined upstream of the exhaust gas catalytic converter of the internal combustion engine as a function of at least one operating variable of the internal combustion engine, which is representative of the exhaust gas counter pressure in a current operating mode of the internal combustion engine, assuming a low valve lift or a high valve lift.

Abstract: In one aspect, a method for controlling an internal combustion engine using valve lift switchover is provided. Within the scope of this method, a switchover intake manifold model for the switchover-relevant pressure range for valve lift switchover is applied in addition to the use of a basic intake manifold model. This ensures a valve lift switchover with approximately constant torque of the internal combustion engine.

Abstract: The invention relates to an internal combustion engine comprising a manifold, from which an induction pipe leads to an intake of a cylinder of the internal combustion engine. A gas intake valve is located at the intake of the cylinder. A pulse charging valve is positioned upstream of the gas intake valve in the induction pipe, the latter being released or sealed depending on the selected position of the pulse charging valve. The internal combustion engine is also provided with a pressure sensor, which is located in the induction tract and detects an induction pipe pressure. The progression of the detected induction pipe pressure is compared to that of a reference induction pipe pressure, which characterizes a predetermined operating state of the pulse charging valve. A malfunction of the pulse charging valve is detected depending on said comparison, thus guaranteeing a reliable monitoring of the pulse charging valve.

Abstract: The invention relates to an internal combustion engine comprising a manifold, from which an induction pipe leads to an intake of a cylinder of the internal combustion engine. A gas intake valve is located at the intake of the cylinder. A pulse charging valve is positioned upstream of the gas intake valve in the induction pipe, the latter being released or sealed depending on the selected position of the pulse charging valve. The internal combustion engine is also provided with a pressure sensor, which is located in the induction tract and detects an induction pipe pressure. The progression of the detected induction pipe pressure is compared to that of a reference induction pipe pressure, which characterizes a predetermined operating state of the pulse charging valve. A malfunction of the pulse charging valve is detected depending on said comparison, thus guaranteeing a reliable monitoring of the pulse charging valve.

Abstract: In one aspect, a method for controlling an internal combustion engine using valve lift switchover is provided. Within the scope of this method, a switchover intake manifold model for the switchover-relevant pressure range for valve lift switchover is applied in addition to the use of a basic intake manifold model. This ensures a valve lift switchover with approximately constant torque of the internal combustion engine.

Abstract: The invention relates to a method for determining a boost pressure in an internal combustion engine having an exhaust gas turbocharger in which a wastegate is actuated via the compressed boost air. Since a basic force is required in order to enable actuation of the wastegate, the setpoints for the boost pressure are limited to a minimum value.

Abstract: The invention relates to a method for determining a boost pressure in an internal combustion engine having an exhaust gas turbocharger in which a wastegate is actuated via the compressed boost air. Since a basic force is required in order to enable actuation of the wastegate, the setpoints for the boost pressure are limited to a minimum value.

Abstract: A method for setting the valve lift of an inlet valve of an internal combustion engine at full load. A full-load demand triggers an adaptation function by use of which the valve lift can be set to realize a maximum air mass flow into a cylinder of the internal combustion engine.

Abstract: A device for adjusting a valve stroke course of a gas exchange valve includes a first camshaft which is coupled mechanically to a crankshaft, a second camshaft which is coupled mechanically to the first camshaft, an actuating drive which sets the phase of the second camshaft relative to the first camshaft and a transmission member which transmits the stroke of the camshafts to the gas exchange valve. An apparatus and a method for controlling the device have an actuating drive sensor which detects the angle of rotation of a drive shaft of the actuating drive. Furthermore, the apparatus has a determination unit which determines a quantity characterizing the valve stroke course as a function of the angle of rotation.