| 摘要 |
PURPOSE:To provide the titled system for use in the internal combustion engine, which is capable of warning troubles in its lubricating oil correctly and automatically under any operational conditions of the engine. CONSTITUTION:A voltage signal proportional to the engine speed, obtained a speed sensor 1, is afforded to a reference value setting circuit 3, which produces a hydraulic reference signal VL corresponding to the engine speed. On the other hand, a voltage signal proportional to the hydraulic pressure, obtained by a hydraulic-pressure sensor 2, is affored to an amplifying circuit 4, which produces a voltage signal VP. These two signals are supplied to a comparison circuit 6 for making comparison between them. Here, if the hydraulic output signal VP is lower than the reference voltage VL, a comparison signal of a predetermined voltage is produced. However, if the result of comparison is contrary, voltage of the comparison signal is rendered zero. In response to the comparison signal produced by the comparison circuit 6, current is supplied from a power source 9 to a warning means 8 by a driving circuit 7 for giving an alarm against the drop of hydraulic pressure. |
