Air-fuel ratio detection system for engine exhaust gas

Details Air-fuel ratio detection system for engine exhaust gas Air-fuel ratio detection system for engine exhaust gas

1988-08-30

1989-11-21

Niebling, John F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204425, 204427, G01N 2746

Patent

active

048820300

ABSTRACT:
An air-fuel detection system comprising a solid electrolyte, first and second electrodes formed on the surface of the solid electrolyte, a diffusion resistor formed on the first electrode for controlling the gas diffusion into the first electrode, and a detector circuit for detecting conditions of the engine exhaust gas to detect the air-fuel ratio thereof, wherein the detector circuit measures the electromotive force generated between the first and second electrodes during a first period, and controls a selected one of the voltage and current applied between the first and second electrodes to keep the electromotive force constant during a second period, the selected one of the voltage and current being produced as a signal representing the air-fuel ratio.

REFERENCES:
patent: 4282080 (1981-08-01), Muller et al.
patent: 4578172 (1986-03-01), Yamada
patent: 4591421 (1986-05-01), Yamada et al.
patent: 4594139 (1986-06-01), Asayama et al.
patent: 4601793 (1986-07-01), Asayama et al.
patent: 4626338 (1986-12-01), Kondo et al.
patent: 4629549 (1986-12-01), Kojima et al.
SAE Technical Paper Series, "Air-Fuel Ratio Sensor for Rich, Stoichiometric and Lean Ranges", Reprint from SP-655, Sensor and Actuators (1986).

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