System controlling any air/fuel ratio with stoichiometric sensor

Internal-combustion engines – Charge forming device – Fuel injection system

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60276, F02D 500

Patent

active

043005071

ABSTRACT:
In a fuel management system for an internal combustion engine, a system utilizing a stoichiometric gas sensor in the exhaust gas system for supplying an electrical signal to an asymmetrical integrator which controls and maintains any desired air/fuel ratio to the engine. By means of the system, the air/fuel ratio may be maintained slightly richer than stoichiometric for optimum catalytic converter operation. For very lean air/fuel ratios, a delay circuit is used in the system to continue the time the fuel mixture is in a lean condition before the mixture is controllably changed to a rich mixture for sensing by the sensor.

REFERENCES:
patent: 3782347 (1974-01-01), Schmidt et al.
patent: 3831564 (1974-08-01), Schmidt et al.
patent: 4073269 (1978-02-01), Herth et al.
H. Eisele: "Electronic Fuel Injection in Europe", Paper presented at International Colloquium on Automotive Electronics Technology--Convergence 1974, Troy, Mich., Oct. 1974.
J. Camp et al.: "Closed-Loop Electronic Fuel and Air Control of Internal Combustion Engines", SAE paper at Automotive Engineering Congress and Exposition, Feb. 24-28, 1975, Detroit, Mich.

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