System for diagnosing an internal combustion engine

Details System for diagnosing an internal combustion engine System for diagnosing an internal combustion engine

1983-09-26

1985-08-13

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

731173, 340 52F, G01M 1500

Patent

active

045342148

ABSTRACT:
A system for diagnosing an internal combustion engine having a coolant temperature sensor. A coolant temperature diagnosing circuit is provided which is responsive to the output voltage of the sensor for producing a signal when the voltage exceeds a predetermined range. A fail-safe signal generating circuit is provided which is responsive to engine speed and to produce fail-safe signals dependent on the engine speed so as to prevent stalling of the engine.

REFERENCES:
patent: 3938075 (1976-02-01), Reddy
patent: 3960011 (1976-06-01), Renz et al.
patent: 4219798 (1980-08-01), Frister
patent: 4244340 (1981-01-01), Herth et al.
patent: 4246566 (1981-01-01), Endo et al.

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