| 摘要 |
PURPOSE:To measure exactly a power variation by deriving a differential value in the maximum part of a gradient in a periodical and pulsative signal variation of at least one of a revolving speed, a torque, and an internal pressure of a cylinder of an internal combustion engine. CONSTITUTION:An angle signal from an angle signal sensor 4 is shaped as to its waveform by a waveform shaping circuit 71A, and inputted to a revolving speed counting circuit 72. The revolving speed counting circuit 72 counts a period of the angle signal and sends it by a binary data to a CPU 74. The CPU 74 brings it to a reciprocal operation and obtains a revolving speed. A cylinder discriminating signal from a cylinder discriminating sensor 6 is shaped as to its waveform by a waveform shaping circuit 71B, and inputted to the CPU 74 through a reading circuit 73. A differential value of the maximum part of a gradient of a revolving speed of an engine calculated by the CPU 74 or a torque variation quantity is derived, and the derived differential value is decided to be a value corresponding to a fuel. Also, the torque variation quantity is converted to an analog signal by a D/A converter 75, sent to an air fuel ratio control device or an ignition time control device, which is not shown in the figure, and a power variation is measured exactly. |
