| 摘要 |
The circuit for automatically displaying disorder generated from a plurality of preheating plugs, facilitates checking of the engine starting in a short time. The circuit of the engine having a power- supply battery (1), preheating switch (2), preheating relay (3) for supplying power from battery (1) to preheating plugs (4a-4d), a plurality of the plugs (4a-4d) for preheating suction air in cylinder, comprises a comparing device (13) for converting variable voltage level from disorder of the plugs to the voltage signal and amplifying the signal and generating the output voltage signal; OP amplifier (14) for amplifying the signal from the device (13); transistor (19) for switching ON/OFF by the signals; light emitting diode (21) for displaying disorder of plugs.
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