Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr

Malte Koeller

Olaf Magnor

Matthias Schultalbers

Michael Schnaubelt

Daniel Reitebuch

Ulf Lezius

A method is used for determining an operating point of a compressor that includes at least one impeller, compressor blades attached to the impeller, a housing and at least two sensors. The method includes calculating a deflection of the compressor blades. An operating point and a surge margin with respect to a surge limit are determined based on the calculating of the deflection by measuring passage times of the compressor blades at a sensor. A signal that is representative of a rotation speed is determined and is associated with the compressor impeller. In a learning or adaptation mode, compressor blade-specific, state-induced and position-induced deviations from an ideal state are determined using compressor blade-specific passage times that are measured and compared with ideal passage times. In a working mode, compressor blade-specific passage times are measured and the compressor blade-specific passage times are corrected using the determined state-induced and position-induced deviations.

Device and method for reliably operating a compressor at the surge limit

A method for estimating the cylinder interior pressure of an internal combustion engine from a cylinder pressure model having at least the input variables load, speed of rotation, and crank angle (P), which forms the cylinder interior pressure (P) to be determined, corrected by a pressure correction value (&#x394;P). The pressure correction value (&#x394;P) is determined from an observation of the alternating moments at the crankshaft. The modeled value of the cylinder interior pressure from the pressure model is obtained as a pre-control value, and corrected with a correction value formed from the measured value of the non-uniformity of rotation.

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Ribnitz-Damgarten, Germany

Malte Koeller