| 摘要 |
PURPOSE:To detect the injection amount highly accurately even though a valve opening time is changed over a wide range, by taking the counted value, by which the detected value close to the amount of the fuel injection is obtained, out of the counted values with respect to a plurality of measuring pulse signals. CONSTITUTION:The measuring pulse signal Pa generated by a first measuring pulse generating part 2a and the measuring pulse signal Pb generated by a second measuring pulse generating part 2b have different frequencies each other. The number of pulses counted by counter parts 4a and 4b are also different each other. When the pulse width of an injection pulse signal Pa is smaller than a specified value T, the counted value for the measuring pulse signal Pa having the higher frequency passes a switching circuit 5. When the pulse width is larger than the specified value T, the counted value of the signal Pb having the lower frequency passes the switching circuit 5. The counted value signal which has passed said circuit 5 displays the detected value on a display part 8 through a driving circuit 7. In this way, even though the valve opening time is changed over the wide range, the amount of the fuel injection can be detected highly accurately. |
