Contaminations detecting device for air filter utilized for filtering contamination particles of intake air in intake system of internal combustion engine of vehicle, has signal processing unit for outputting display signal at output device

摘要

The device (1) has a microphone (7) and an air filter (4) arranged in a housing (2), and a signal processing unit (8) connected with the microphone, where the signal processing unit has a comparison device and an output device (9). The signal processing unit is formed such that the comparison device compares a noise signal transmitted by the microphone with a stored noise signal. The signal processing unit outputs a display signal for contaminations of the air filter at the output device when a deviation is detected between the transmitted noise signal and the stored noise signal. An independent claim is also included for a method for detecting contaminations of an air filter.