Patent ID: 8649934

Claim:
A method for checking the plausibility of the signals of a tank filling level sensor of a motor vehicle ( 120 ), characterized in that the roadway inclination of the roadway ( 130 ) which is traveled on by the motor vehicle ( 120 ) is determined, and definitive information about the possibility of using the signals of the tank filling level sensor is obtained as a function of the roadway inclination (N); the roadway inclination (N) is determined by sensing the change in the geodetic altitude (h) and the distance (Δs) which has been traveled by the vehicle in the process, using the following proximity formula: N =arctan(Δ h/Δs )·100[%] or: N =arccos(Δ h/Δs )·100[%]; the change in the geodetic altitude (h) is determined by sensing and storing the current altitude (h 1 , h 2 ) of the vehicle over the distance (Δs) which has been traveled by the vehicle ( 120 ) and forming the differences (Δh) between the respectively sensed and stored geodetic altitudes; and, the current altitude (h) is determined on the basis of the sensed ambient air pressure (p) using the international altitude formula: h ⁡ ( p ⁡ [ hPa ] ) = ( 1 - p 1 5.255 1013.25 ) · 288.15 0.0065 ⁡ [ m ] .