Patent ID: 9470600
Filing Date: 2016-10-18
CPC Classification: F02M,G01L

Claim Text:
1. A method for diagnosing a differential pressure sensor, the method comprising: selecting a tolerance range of predetermined values of a pressure difference that prevails across a low-pressure exhaust-gas recirculation valve for an output signal to be output by the differential pressure sensor when a predefined operating condition is present, wherein the differential pressure sensor is situated in a first air duct and the first air duct is located downstream of an exhaust-gas turbine with respect to an exhaust gas flow, as part of a low-pressure exhaust-gas recirculation system of an internal combustion engine, and the differential pressure sensor is configured to measure the pressure difference; receiving the output signal output by the differential pressure sensor while the predefined operating condition is detected to be present; and ignoring an error, in which output signal falls out of the tolerance range, if, subsequent to the detection of the presence of the predefined operating condition, a disturbance pressure is detected in the first air duct; wherein: