Audi Ag

Siemens Aktiengesellschaft

Johann Graf

Michael Henn

Martin Steinbrueck

Hong Zhang

Gerhard Schopp

Robert Fromm

Martin STEINBRÜCK

The invention relates to a coolant circuit () for an internal combustion engine (), wherein the coolant can circulate between the internal combustion engine () and a heat sink () depending upon a switchable valve (), which is closed in the initial state during a cold start of the internal combustion engine (), wherein the valve () can be switched to an at least partially opened sequential state depending on an exhaust gas mass flow emitted by the internal combustion engine (), and wherein a control device () determines an integral of the exhaust gas mass flow with respect to the time and switches the valve () into the sequential state when an integral threshold value is exceeded.

Coolant circuit for an internal combustion engine and method of operating a coolant circuit

A method and apparatus for operating a valve train of an internal combustion engine having a main camshaft for which at least one rotationally-fixed cam carrier is provided that can be shifted between two axial positions is disclosed. An actuator cooperates with at least one shift gate to axially shift the cam carrier into a target position. The actuator comprises a driver that is extended in the direction of at least one sliding slot of the shift gate to shift the cam carrier. The sliding slot has an ejection ramp in an ejection region that ejects the driver out of the sliding slot until the conclusion of the shift. A voltage induced in the actuator by the ejection is detected, the induced voltage is integrated across a rotational-angle range associated with the ejection region, and a confirmation signal is generated when the integrated voltage exceeds a threshold level.

Method for operating a valve train of an internal combustion engine and corresponding valve train

In a method and a device for diagnosing a switchable coolant pump for circulating a coolant in a coolant circuit of an internal combustion engine, an actual value of the cylinder head temperature of the internal combustion engine is measured and the actual value of the cylinder head temperature is compared with a model value of the cylinder head temperature. The functionality of the coolant pump is assessed according to the comparison result.

Method and apparatus for diagnosing a coolant pump for an internal combustion engine

In a motor vehicle having two different drives, in particular an internal combustion engine and an electric drive, there are two control units for the respective drives and a leading control unit (Hybrid), which preferably controls the internal combustion engine and assigns torque to the individual drives when there are torque requests. Corresponding request signals are sent and implemented only if the existence of a certain situation (key inserted, 'terminal) is detected by an engine immobilizer control unit (EI master). In order for not too much time to pass due to the querying of the engine immobilizer control unit, the leading control unit informs the other control units that a query is sent so that the other control units can also send a query already.

Method for operating drive control units in a motor vehicle, and motor vehicle

In a hybrid vehicle which has a plurality of drives, of which in particular one drive is a combustion engine and the other is an electric drive, all the drive control units, if appropriate even a transmission control unit, require enabling by an immobilizer control unit before the first control unit outputs control commands to communicate a torque request, input by a vehicle driver.

Hybrid vehicle with immobilizer

The invention relates to a method for operating at least one drive motor, particularly an internal combustion engine, of an automobile, particularly a motor vehicle, wherein the engine speed of the drive motor in the detected idle state of the motor vehicle does not exceed a predetermined maximum value by means of engine speed limitation. It is provided that the idle state detected is verified at least once by means of a test cycle.

Method for operating at least one drive motor of a motor vehicle

The activation of a swirl control valve which is seated downstream of a throttle valve in the intake tract of an internal combustion engine is diagnosed. The swirl control valve is activated by a specific adjustment travel within a supercritical operating range of the intake pipe pressure in the intake tract downstream of the throttle valve. If a specific jump in pressure that is dependent on the adjustment travel does not take place in the intake tract downstream of the throttle valve, a defect in the actuation of the swirl control valve is diagnosed.

Method for diagnosing the adjustment device of a swirl control valve

An internal combustion engine having cylinders with injection valves and air mass-setting actuators, an air/fuel ratio sensor detecting the ratio in the individual cylinders, and a sensor detecting a torque generated in the individual cylinders or differences in the torques generated in the cylinders includes individually determining the air/fuel ratio for each cylinder, individually correcting an activation of the fuel injection valve for each cylinder as a function of the detected air/fuel ratio and of a desired value of the air/fuel ratio, determining the variable characterizing the torque or the differences in the torque for each cylinder, individually correcting an activation of the air mass-setting actuator for each cylinder as a function of the detected value of the variable characterizing the torque or of the variable characterizing the difference in the torque specifically with the effect of assimilating the torques generated by the individual cylinders.

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Hausen, Germany

Johann Graf