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

1985-10-15

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

340 52F, G01M 1500

Patent

active

045466475

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 computer 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 filtering the output voltage and a resistor is connected in parallel to the capacitor for discharging thereof and a diagnosing circuit is provided to respond to the output voltage for producing a diagnosis signal when the output voltage decreases to a predetermined level.

REFERENCES:
patent: 3938075 (1975-02-01), Reddy
patent: 4217863 (1980-08-01), Ezoe
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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