Diagnosis arrangement for operating condition of combustion engine, such as diesel motor having sound analysis unit arranged in air inlet and/or exhaust fume area

摘要

The arrangement includes a sound analysis unit (3, 3') arranged in an air inlet and/or exhaust fume area of a combustion drive (1) for converting sound waves to signals which are at least a measure for an amplitude of soundwaves of different frequencies in the air inlet and/or exhaust fume area. A comparison unit (5,5') compares signals from the sound analysis unit with nominal signals.