Adaptive vehicle engine closed loop air and fuel mixture control

Details Adaptive vehicle engine closed loop air and fuel mixture control Adaptive vehicle engine closed loop air and fuel mixture control

1979-04-30

1981-01-20

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123437, F02B 3300

Patent

active

042456037

ABSTRACT:
A closed loop air and fuel ratio controller is responsive to the oxidizing/reducing conditions in the exhaust gases from an internal combustion engine to provide a control signal having a value for adjusting both the idle and main fuel metering circuits of a carburetor so as to supply an air and fuel mixture to the engine at a predetermined ratio. Two memory elements are provided, each being associated with a respective one of the idle and main fuel metering circuit for storing a value of the control signal provided by the controller. During operation of each of the idle and main fuel metering circuits, the value of the control signal stored by the respective one of the storage elements is updated in accord with the average value of the control signal provided by the controller. When the carburetor shifts operation from one of the fuel metering circuits to the other, the control signal provided by the controller is preset to the average value stored in the respective storage element, which value produced the desired oxidizing/reducing condition during prior engine operation in the respective fuel metering circuit. The adjustment of the value of the signals stored by the storage elements is inhibited during the conditions of engine speed which are representative of conditions wherein the oxidizing/reducing conditions in the exhaust gases do not accurately represent the actual air/fuel ratio of the mixture supplied by the respective idle and main fuel metering circuits.

REFERENCES:
patent: 3906910 (1975-09-01), Szlago, Jr.
patent: 3973529 (1976-08-01), Wessel et al.
patent: 4030394 (1977-08-01), Wahl et al.
patent: 4057042 (1977-11-01), Aono
patent: 4136645 (1979-06-01), Ito et al.
patent: 4138979 (1979-02-01), Taplin
patent: 4173956 (1979-11-01), Ikeura et al.

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