| 摘要 |
PURPOSE:To control ignition timing with high precision by detecting the actual top dead center position of a piston and correcting the standard crank angle position according to the actual top dead center position and obtaining the max. pressure angle on the basis of the corrected standard crank position angle and controlling the ignition timing. CONSTITUTION:A piezoelectric type pressure sensor 22 for detecting the cylinder internal pressure is arranged in each cylinder of an internal combustion engine 20, and the max. pressure value is obtained by measuring the interval between each standard crank position and the max. pressure value generating position by a peak hold circuit 28, comparison circuit 32, etc. on the basis of the output of each pressure sensor 22. In this case, the actual top dead center position of a piston is detected on the basis of the output signal of each crank sensor 36 installed in the vicinity of the revolution part of the internal combustion engine, and the standard crank angle position is corrected according to the actual top dead center position. The max. pressure angle is obtained on the basis of the standard crank angle position after correction is obtained, and the ignition timing is controlled by a control unit 24 according to the max. pressure angle. |
