| 摘要 |
PURPOSE:To check whether the lubricating oil of an engine is sufficient or not, by judging whether or not the oil pressure is kept proper in each of the rotational frequency stages from the starting of the engine to its normal rotational frequency. CONSTITUTION:A rotation sensor 1 detects the rotational frequency of an engine by the number of pulses proportional to the rotational frequency. The detected rotational frequency is applied to a plurality of comparators 3-8. Oil pressure contacts 23-25 are provided to detect the oil pressure of the lubrication system of the engine at a plurality of oil pressure levels. A logical circuit unit comprising AND circuits 10-16, OR circuits 17, 18, delaying elements 19, 20 and and flip-flop circuits 21, 22 performs discriminating operation on the signals from the comparators 3-8 and the oil pressure contacts 23-25 to judge whether or not the oil pressure of the engine is proper in each of its rotational frequency stages. |
