Air/fuel ratio monitoring system in IC engine using oxygen senso

Details Air/fuel ratio monitoring system in IC engine using oxygen senso Air/fuel ratio monitoring system in IC engine using oxygen senso

1983-01-27

1985-01-22

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

123440, 123489, 123589, F01N 320

Patent

active

044943741

ABSTRACT:
An air/fuel ratio monitoring system in an IC engine, using an oxygen sensor of the concentration cell type which has a laminate comprising an inner electrode layer, a microscopically porous layer of oxygen ion conductive solid electrolyte and an outer electrode layer exposable to exhaust gas and which exhibits a sharp change in output voltage level in response to a change in the air/fuel ratio in the engine across a stoichiometric ratio. To ensure accurate monitoring of the air/fuel ratio even when the engine is operated under conditions which cause a large rise or fall in an average level of the output of the oxygen sensor, the monitoring system has a signal treatment means for producing a variable reference voltage, with which the sensor output is compared, by first adding a definite voltage to or subtracting a definite voltage from the output of the oxygen sensor depending on the result of comparison between the sensor output and the reference voltage and then smoothing the voltage resulting from the addition or subtraction of the definite voltage.

REFERENCES:
patent: 4167925 (1979-09-01), Hosaka
patent: 4170965 (1979-10-01), Aono
patent: 4354468 (1982-10-01), Sone
patent: 4391256 (1983-07-01), Sawada
patent: 4392471 (1983-07-01), Miyagi

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