Audi Ag

Aft Atlas Fahrzeugtechnik Gmbh

Uwe Finis

Markus Wilke

Armin Koehler

Ludger Hoelscher

Armin Köhler

Kave Kianer

Marco Rohe

Ludger HÖLSCHER

A method for determining the size of a leak in the liquid-containing tank device of a vehicle, in particular of a motor vehicle, the liquid influencing the pressure in the tank device by evaporation, with the following steps: generating a first pressure as a reference pressure in the tank device at a first instant, detecting a first pressure characteristic up to a second instant, generating a second pressure at a third instant, the first pressure and the second pressure being chosen to be different, detecting a second pressure characteristic up to the fourth instant, determining the pressure gradient of the first pressure characteristic at the second instant and of the pressure gradient of the second pressure characteristic at the third instant, determining the first pressure difference of the pressure at the second instant from the reference pressure, determining the second pressure difference of the pressure at the third instant from the reference pressure, computing the size of the leak depending on the determined pressure gradient and the pressure differences, and the assumption that the evaporation rate is constant in the tank device, and that a leak rate is established which is proportional to the square root of the respective pressure difference.

Method for determining the size of a leak

A method for adjustment of the relative angle of rotation between a camshaft and a crankshaft in an internal combustion engine through an electromechanical phase adjuster is provided. The invention provides a rapid and precise adjustment behavior. To that end, a deviation of the adjustment speed (&#x394;&#x3a9;) between a desired adjustment speed (&#x3a9;) and an actual adjustment speed (&#x3a9;) is calculated from at least one measurement parameter in a second control loop cascaded below the first control loop. An output parameter is calculated dependent on the deviation of the adjustment speed (&#x394;&#x3a9;) through an adjustment speed adjuster () cascaded below the angle of rotation adjuster (), with the output parameter being used to adjust the angle of rotation (&#x3a6;) using an electromechanical actuator (). The relative angle of rotation can be rapidly and precisely adjusted by adjusting the adjustment speed. A phase adjuster for controlling the relative angle of rotation is also provided.

Method for adjusting an angle of rotation, and phase displacement device for carrying out said method

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Neuenrade, Germany

Uwe Finis