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US 4,059,087 AGranted
Oil pressure detecting apparatus for internal combustion engines
AssigneeHitachi, Ltd.
InventorsTakahiko Tanigami, Akira Hasegawa, Shigeru Horikoshi
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Abstract
An oil pressure detecting apparatus for an internal combustion engine comprises an LC oscillator having an inductance variable in dependence upon variation in the oil pressure of the engine. The frequency or voltage of an output signal of the oscillator is compared with that of a reference signal having a predetermined relation to the number of revolutions of the engine, thereby to determine if the oil pressure is within an acceptable range.
Claims4
An apparatus for detecting an oil pressure in an internal combustion engine, comprising:
- first means for detecting the number of revolutions of the engine and producing a first signal representative of a critical value of the oil pressure in accordance with the detected number of revolutions;
- second means for detecting the oil pressure and producing a second signal representative of an actual oil pressure in accordance with the detected oil pressure;
- and
- third means for comparing the first signal with the second signal and producing an output when the second signal is smaller than a predetermined level.
1 more element
Dependencies are inferred from the claim text.