Abstract: A method for the functional testing of a pressure switch of a tank vent device for an internal combustion engine of a motor vehicle, enables the testing of the pressure switch even while the crankshaft is rotating. The pressure switch is located in a low pressure position if the pressure in the tank vent device is lower than a pressure threshold, and is otherwise in a high pressure position. In a rotating operating state of the crankshaft in which the pressure in an intake pipe exceeds the pressure threshold, a tank vent valve being disposed in a connecting line between a fuel vapor reservoir and the intake pipe is actuated such that the tank vent device and the intake pipe are pneumatically connected to each other. The pressure switch is assessed as defective if it is in the low pressure position after actuation of the tank vent valve.

Abstract: A method for checking the plausibility of a temperature value in an internal combustion engine has the following steps: ascertaining a measurement value (TCO) of the temperature value, ascertaining a model value (TCO_SUB) of the temperature value, comparing the measurement value (TCO) and/or the model value (TCO_SUB) to at least one threshold value (TCOMAX), determining the plausibility of the temperature value as a function of the comparison, and defining the threshold value (TCOMAX) as a function of the temperature value in the internal combustion engine.

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 a control method suitable for an internal combustion engine (1) of a motor vehicle with an automatic engine cut-off and starting system (33) by which the internal combustion engine (1) can be cut off and started independently from the driver of the motor vehicle, the starting of the internal combustion engine (1) is detected and a variable determined, which represents a measure for the work performed by the internal combustion engine (1) since it has been started. The cut-off of the internal combustion engine (1) is controlled by the automatic engine cut-off and starting system (33) according to the variable.

Abstract: In a method and a device for operating an internal combustion engine with a fuel pump, which on the drive side is coupled with a camshaft or a crankshaft, and a fuel accumulator, which is supplied by the fuel pump and to which a pressure sensor is assigned for sensing the pressure in the fuel accumulator, to each cycle of the internal combustion engine a first and a second crankshaft rotation (CRK_R1, CRK_R2) are assigned. Depending on a signal sequence (P_F_S) of the sensed pressure in the fuel accumulator which is characteristic of the respective crankshaft rotation it is ascertained whether the crankshaft is in its first or second rotation (CRK_R1, CRK_R2).

Abstract: A first camshaft misalignment value is determined from a measurement variable allocated to an engine air flow path. A second misalignment value is determined from a first operating variable outside of the air flow path. A trouble-free operation is identified when both values are smaller than a predefined first threshold. Misalignment is confirmed when one of both values is greater than the first and a difference between both values is smaller than a predefined second threshold. An air flow path fault is identified when the first value is greater and the second value is smaller than the first threshold and when the difference between both values is greater than the second threshold. A fault outside of the air flow path is identified, when the second value is greater and the first value is smaller than the first threshold and when the difference is greater than the second threshold.

Abstract: In a method and a device for controlling a pump (14, 20) connected to a fuel rail (12) in an internal combustion engine, in order to provide a predetermined quantity of fuel in the fuel rail (12) for a predetermined operating state, the following steps are provided: determining whether a process occurs that switches the internal combustion engine into a next predetermined operating state; determining a pump output of the pump (14, 20) if the process for switching the internal combustion engine into a predetermined operating state was detected, whereby the pump output of the pump (14, 20) is selected such that the predetermined quantity of fuel is provided for the operating state; and actuating the pump (14, 20) so that the pump (14, 20) provides the predetermined quantity of fuel when the predetermined operating state is reached.

Abstract: An internal combustion engine is provided with at least one modulator for adjusting an air mass in a cylinder. It is also provided with an injection valve for metering fuel to which fuel is supplied via a fuel supply device. A maximum fuel quantity which can be metered to the cylinder per working stroke is determined. Depending on the maximum meterable fuel quantity, a maximum producible torque is determined. An air mass flow is determined depending on an air/fuel ratio to be adjusted and the maximum meterable fuel quantity is adjusted by controlling the at least one modulator for adjusting the air mass. The injection valve is controlled in accordance with the maximum meterable fuel quantity when the required torque is greater or equal the maximum producible torque.

Abstract: In a method and a device for operating an internal combustion engine with a fuel pump, which on the drive side is coupled with a camshaft or a crankshaft, and a fuel accumulator, which is supplied by the fuel pump and to which a pressure sensor is assigned for sensing the pressure in the fuel accumulator, to each cycle of the internal combustion engine a first and a second crankshaft rotation (CRK_R1, CRK_R2) are assigned.

Abstract: There is described a method for detecting the ambient pressure by a pressure sensor in the intake pipe of an internal combustion engine. A throttle flap is opened so that the pressure drop via the throttle flap can be neglected. The dethrottling of the internal combustion engine is compensated by the appropriate adjustment of the cam shaft in accordance with the operating state of the internal combustion engine, so that the measuring method is not being felt by the driver.

Abstract: Disclosed is a fuel supplying device of an internal combustion engine, comprising a low-pressure circuit, a high-pressure pump coupled to the low-pressure circuit and conveys fuel into a fuel reservoir, a volume flow control valve assigned to the high-pressure pump, an electromechanical pressure regulator connected to the fuel reservoir and the low-pressure circuit and can direct fuel from the fuel reservoir into the low-pressure circuit, a regulating mechanism which generates an actuation signal for the volume flow control valve by a first controller in a first mode which generating an actuation signal for the electromechanical pressure regulator with the aid of a second controller in a second mode. The mode of the fuel supplying mechanism is switched in accordance with a fuel pressure error value resulting from a detected fuel pressure and a predefined fuel pressure. The mode can additionally be switched according to the throughput of the high-pressure pump.

Abstract: A method and system for controlling an internal combustion engine is provide. The engine has a fuel-supply device, a low-pressure circuit and a high-pressure pump, to which a control valve for a volumetric flow is allocated is provided. Said pump is coupled on the inlet side to the low-pressure circuit and transports fuel to a fuel accumulator. An estimated value of the drive torque of the high-pressure pump is determined in accordance with the fuel pressure in the fuel accumulator. A loss torque is determined in accordance with the estimated value for the drive torque of the high-pressure pump and additional loss-torque fractions, which are dependent on a motor speed and additional operating variables. A target torque is determined in accordance with the loss torque and an actuating signal for controlling an actuator of the internal combustion engine is generated from the target torque.

Abstract: The invention relates to n internal combustion engine and method for controlling a supercharged internal combustion engine, wherein a deviation of the actual lambda value from a calculated lambda value is detected. The value for the exhaust back pressure is corrected subject to the detected deviation for the event of a valve overlap, when the gas exchange valves of the burner head are simultaneously open. The corrected value for the exhaust back pressure is used to determine the air volume in the cylinder.

Abstract: The tank venting device has a fuel vapor reservoir connected to a fuel tank to deliver escaping fuel vapors to the fuel vapor reservoir, and is connected to the internal combustion engine in such a manner that during a tank venting operation the fuel vapors contained in the fuel vapor reservoir are delivered as regeneration gas. To check the operability of the venting device the fuel concentration in the regeneration gas is ascertained at a minimum of two different points in time during the venting operation. The fuel concentration values in the regeneration gas are compared with respective reference values representing the regeneration gas fuel concentration in the situation in which no additional fuel vapors are delivered during the venting operation. The assessment of the venting device operability is carried out by comparison of the values ascertained for the fuel concentration in the regeneration gas with the reference values.

Abstract: The invention relates to an internal combustion engine comprising a fuel supplying device. Said fuel supplying device comprises a low-pressure circuit provided with a low-pressure pump and a high-pressure pump that is coupled to the low-pressure circuit on the input side and transports fuel into a fuel accumulator. A fuel transporting flow of the low-pressure pump is corrected according to an actual and a previously pre-determined nominal value of the fuel pressure in the fuel accumulator.

Abstract: In a method and a device for controlling a pump (14, 20) connected to a fuel rail (12) in an internal combustion engine, in order to provide a predetermined quantity of fuel in the fuel rail (12) for a predetermined operating state, the following steps are provided: determining whether a process occurs that switches the internal combustion engine into a next predetermined operating state; determining a pump output of the pump (14, 20) if the process for switching the internal combustion engine into a predetermined operating state was detected, whereby the pump output of the pump (14, 20) is selected such that the predetermined quantity of fuel is provided for the operating state; and actuating the pump (14, 20) so that the pump (14, 20) provides the predetermined quantity of fuel when the predetermined operating state is reached.

Abstract: An internal combustion engine (30) with a supercharger device (50, 52) for increasing the charging pressure in an air inlet system (33) has a number of cylinders (32). Each cylinder (32) has at least one exhaust valve (36) which is connected to the exhaust system (40) and at least one inlet valve (34), which is connected to the air inlet system (33). Scavenging is carried out with a valve overlap between the inlet valve (34) and the exhaust valve (36). For controlling the operation of the internal combustion engine the system monitors whether the scavenging was successful.

Abstract: The invention relates to a fuel supplying device comprising a low-pressure circuit, a high-pressure pump which is coupled to the low-pressure circuit on the input side thereof and transports fuel into a fuel accumulator, and an actuator which controls the fuel flow rate of the high-pressure pump. In the event of a stationary load, a first value of a fuel pressure and a first actuating signal of the actuator are determined, a second value of the fuel pressure is set, and said second value being larger or smaller than the first value of the fuel pressure by a pre-determined amount, a second actuating signal of the actuator is determined once the second value of the fuel pressure has been set, and an error in the fuel supplying device is detected according to the first and second actuating signals of the actuator.

Abstract: An internal combustion engine is provided with at least one modulator for adjusting an air mass in a cylinder. It is also provided with an injection valve for metering fuel to which fuel is supplied via a fuel supply device. A maximum fuel quantity which can be metered to the cylinder per working stroke is determined. Depending on the maximum meterable fuel quantity, a maximum producible torque is determined. An air mass flow is determined depending on an air/fuel ratio to b adjusted and the maximum meterable fuel quantity is adjusted by controlling the at least one modulator for adjusting the air mass. The injection valve is controlled in accordance with the maximum meterable fuel quantity when the required torque is greater or equal the maximum producible torque.

Abstract: The invention relates to a fuel supplying device comprising a low-pressure circuit, a high-pressure pump which is coupled to the low-pressure circuit on the input side thereof and transports fuel into a fuel accumulator, and an actuator which controls the fuel flow rate of the high-pressure pump. In the event of a stationary load, a first value of a fuel pressure and a first actuating signal of the actuator are determined, a second value of the fuel pressure is set, and said second value being larger or smaller than the first value of the fuel pressure by a pre-determined amount, a second actuating signal of the actuator is determined once the second value of the fuel pressure has been set, and an error in the fuel supplying device is detected according to the first and second actuating signals of the actuator.