| 摘要 |
PURPOSE:To measure the intake air quantity with high accuracy without being influenced by dust, carbon, etc., by calculating a cross-correlation function of damped waveform signals by two light emitting photodetectors and a flying time of a fuel mist with respect to an interval of the peaks and measuring the intake air quantity. CONSTITUTION:A fuel feeder 2 is provided at the upstream side of a throttle valve 5 in an internal combustion engine. Two light sources 3 with small luminous fluxs are provided at a prescribed interval mutually with respect to the direction of the inlet flow on an inlet pipe between the feeder 2 and the valve 5 and the photodetectors 4 are arranged at the positions in opposition respectively. Then, the respective damped waveform signals generating by the passing of the fuel mist are inputted to a detected signal processing circuit 6 and the cross-correlation function of two damped waveform signals is calculated and a time lag between the signals of two photodetectors 4 with respect to the peak value is calculated. In this way, the flow velocity of the fuel mist is detected and the intake air quantity is calculated from the flow velocity of the fuel mist.
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