Patent ID: 8155821

Claim:
A method of operation of a vacuum brake booster of a vehicle brake system, comprising a housing which is subdivided by at least one movable partition into at least one vacuum chamber and at least one working chamber, with the vacuum chamber being connected to a vacuum source by way of a vacuum port, and with a sensor unit associated with the vacuum chamber sensing a pressure in the vacuum chamber and supplying a sensed pressure value to an electronic control unit, the electronic control unit configured to evaluate the sensed pressure value in the vacuum chamber and calculate an operating point of the vacuum brake booster solely on the basis of the sensed pressure within the vacuum chamber, wherein verification of the sensed pressure measured by the sensor unit is performed to identify defects of the sensor unit or the vacuum brake booster, and wherein a model is calculated for the verification which estimates state variables in the vacuum chamber and the working chamber on the basis of empirically determined data in connection with fluidic and thermodynamic processes.