Air/fuel ratio control method having fail-safe function for abno

Details Air/fuel ratio control method having fail-safe function for abno Air/fuel ratio control method having fail-safe function for abno

1983-05-27

1985-09-24

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 123438, 123480, F02M 700, F02B 300

Patent

active

045427291

ABSTRACT:
An air/fuel ratio control method in which the air/fuel ratio of an air/fuel mixture being supplied to an internal combustion engine is controlled to required values by the use of a first coefficient which has a value variable with a change in the output of the oxygen concentration detecting means, during feedback mode control, and by the use of a second coefficient which is a mean value of values of the first coefficient applied during the above feedback mode control, during operation of the engine in a mode other than the feedback mode control. When the above second coefficient has a value falling outside a predetermined range of values, the value of the same coefficient is set to a predetermined value. Preferably, the above predetermined value of the second coefficient is set at a constant value of 1.0 or a constant value adapted to obtain a required quantity of the air/fuel ratio of an air/fuel mixture to the engine in dependence upon the operating characteristics of the engine.

REFERENCES:
patent: 4375796 (1983-03-01), Ohgami et al.
patent: 4380986 (1983-04-01), Latsch et al.
patent: 4392471 (1983-07-01), Miyagi et al.
patent: 4397278 (1983-08-01), Hughes
patent: 4402292 (1983-09-01), Ohgami et al.
patent: 4408584 (1983-10-01), Yabuhara et al.

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