Air-fuel ratio control apparatus for internal combustion engines

Details Air-fuel ratio control apparatus for internal combustion engines Air-fuel ratio control apparatus for internal combustion engines

1989-10-04

1990-07-31

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02M 5100

Patent

active

049442740

ABSTRACT:
An air-fuel ratio control apparatus for an internal combustion engine includes a solid electrolyte having a first electrode disposed on one surface thereof to contact with the atmosphere and a second electrode disposed on the other surface thereof to contact with the exhaust gas from the engine through a diffusing resistor, and means for applying a voltage across the first and second electrodes to detect an oxygen pump current flowing in the solid electrolyte whereby a correction factor relating to a change in the diffusion coefficient of the diffusing resistor is computed so that the oxygen pump current detected by the detecting means is corrected in accordance with the correction factor and the air-fuel ratio of the exhaust gas is determined in accordance with the corrected oxygen pump current, thereby controlling the quantity of fuel supplied to the engine in accordance with the determined air-fuel ratio.

REFERENCES:
patent: 4834051 (1989-05-01), Tanaka et al.
patent: 4842711 (1989-01-01), Asakura et al.
patent: 4860712 (1989-08-01), Nakajima et al.

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