Air-fuel ratio detecting device

Details Air-fuel ratio detecting device Air-fuel ratio detecting device

1991-07-16

1994-03-01

Raevis, Robert

Measuring and testing

Vehicle chassis

Steering

73 46, 73 232, G01M 1500

Patent

active

052897176

ABSTRACT:
An air fuel ratio detecting device has an air-fuel ratio sensor for producing an air-fuel ratio information indicative of the concentration of oxygen in an exhaust gas produced by a burned air-fuel mixture in the internal combustion engine. An air-fuel ratio is calculated on the basis of the air-fuel ratio information. A pressure in the exhaust gas is calculated on the basis of pressure information depending on the pressure of the exhaust gas. The difference between the pressure and a reference pressure which acts on the air-fuel ratio sensor when the air-fuel ratio sensor is placed in a reference environment, is calculated. The air-fuel ratio is corrected with the pressure difference. The corrected air-fuel ratio is free of pressure fluctuations of the exhaust gas, and is highly reliable for accurate air-fuel ratio control. The air-fuel ratio detecting device is effective for improved fuel economy, increased engine output power, a more stable idling engine speed, purified exhaust emission, and improved drivability.

REFERENCES:
patent: 3948081 (1976-04-01), Wessel et al.
patent: 4488529 (1984-12-01), Nishida et al.

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