| 摘要 |
PURPOSE:To widely improve the workability of diagnosis by using a sensor to detect a prominent and high-level signal for the injection end timing, using a stroboscope to determine the injection end timing during an actual operation, and obtaining whether the diagnosis result is good or bad in a binary signal. CONSTITUTION:A vibration or acoustic sensor 12 is fitted to the head of a fuel injection valve 3, a signal in response to the injection end timing is extracted in a signal processing circuit 32 from its output signals, and this signal is delayed by an optional time to trigger a stroboscope 33. In addition, the output level of a reference voltage generator 18 is set in response to the type of a diagnosed device 26, the standard crank angle information is read out from a standard value memory 35, and a delay time regulator 21 is operated so that the specific cylinder TDC mark 30 can be observed in coincidence with the reference TDC mark 29. When the injection end timing of the diagnosed device is normal, that effect is displayed on a display unit 37 via the output of a comparator 36. |
