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

1986-07-08

Lall, Parshotam S.

Boots, shoes, and leggings

123479, 123494, F02D 500, G06F 1130

Patent

active

045996962

ABSTRACT:
A system for diagnosing an internal combustion engine having an air-flow meter. The air-flow meter comprises a voltage divider including a variable resistor. A wiper of the variable resistor is operatively connected to a flap in an intake passage so as to produce an output voltage, responsive to the volume of the intake air, a computor is provided for computing the volume of the intake air from the output voltage and a fixed voltage at one end of the variable resistor, a smoothing capacitor is provided for charging the fixed voltage and a diagnosing circuit is provided to respond to the fixed voltage for producing a diagnosis signal when the fixed voltage exceeds a predetermined range.

REFERENCES:
patent: 3938075 (1976-02-01), Reddy
patent: 4155332 (1979-05-01), Yaegashi et al.
patent: 4219798 (1980-08-01), Frister
patent: 4244340 (1981-01-01), Herth et al.
patent: 4246566 (1981-01-01), Endo et al.
patent: 4414949 (1983-11-01), Honig et al.
patent: 4491112 (1985-01-01), Kanegae et al.

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