First fault indicator for engines and the like

Details First fault indicator for engines and the like First fault indicator for engines and the like

G - Physics

01

M

340/51, 340/71,

G01M 15/00 (2006.01) B60K 28/00 (2006.01) F02B 77/08 (2006.01) G08C 19/12 (2006.01) F02B 3/06 (2006.01)

Patent

CA 1058720

ABSTRACT OF THE DISCLOSURE A plurality of indicating circuits are coupled to monitor the operating parameters or conditions, such as, for example, oil pressure, temperature, fuel level, and speed, of an engine or the like, and such indicating circuits provide an indication of the first occurring fault or failed parameter capable of causing engine shut down. Optical isolators are used to facili- tate coupling respective indicating circuits to conventional condition responsive switches, such as oil pressure and engine temperature switches, and in response to an analog input signal proportional to engine speed a speed detector provides a digital output signal indicative of whether the engine speed is above or below a predetermined level. Moreover, after one indicating cir- cuit has indicated a fault, a disabling circuit disables the other indicating subsequent faults, and an automatic reset cir- cuit effectively over-rides the disabling circuit to reset each of the indicating circuits upon engine start-up.

231897

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