| 摘要 |
PURPOSE:To give proper attention to the operator, by increasing reference setting oil pressure of warning in accordance with a rise of engine speed and surely detecting abnormal oil pressure down in a full range from idling to high speed high load operation. CONSTITUTION:An ignition coil 10 is synchronized with an engine speed to generate an ignition signal of fixed pulse width, and this ignition signal is fed to a frequency voltage converter circuit 12 then converted into a voltage signal. Then an output signal VA of the frequency voltage converter circuit 12 is compared with an output signal VB of an equalizer circuit 13 in a comparator 17. Either the signal VA or VB is input to a limiter circuit 20, and an upper limit of this input voltage signal is cut, then said signal is output to a comparator 22 as a warning reference signal of oil pressure. An actual oil pressure signal, detected by an oil pressure sensor 21, is compared with the warning reference signal of oil pressure in the comparator 22, if the oil pressure signal becomes smaller voltage than of the oil pressure warning signal, output is generated to turn on an oil pressure warning lamp 23. |
