DEVICE FOR TESTING AN INTERNAL-COMBUSTION ENGINE

摘要

1. A device for the detection of faults and operating troubles accompanied by a change in vibration behaviour, comprising an internal combustion engine (1) which is at least partially assembled and is driven externally for testing purposes, a vibration detector (6) and an evaluation unit (12) connected thereto, wherein, for the purpose of measuring surface vibrations, said vibration detector (6) is provided with one or more lasers (9) whose beam (s) (10) can be directed at the spots (16) to be measured on the surface of the internal combustion engine (1), and is further provided with a receiver (18) for the radiation reflected from said engine (1), and wherein said evaluation unit (12) includes a demodulation unit, which will separate and process as a test signal the effect of vibrations of the reflecting surface on the laser radiation reflected from the spot to be measured, and wherein is provided a control unit (8) cooperating with an adjusting device (7), which control unit (8) will direct laser (9) and receiver (18) at the particular spot (16) to be measured on the surface of the internal combustion engine (1).