Method for controlling fuel supply to internal combustion engine

Internal-combustion engines – Charge forming device – Having fluidic logic control means

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60277, 123492, F02B 300, F01N 320

Patent

active

045427283

ABSTRACT:
A fuel supply control method for controlling the quantity of fuel being supplied to an internal combustion engine having a catalytic means for purifying detrimental ingredients in exhaust gases, in a feedback manner responsive to the output of a means for detecting the concentration of an ingredient in the exhaust gases. When the engine is operating in a predetermined high speed operating region wherein the rotational speed of the engine is higher than a predetermined speed, the above feedback control is interrupted and the fuel quantity is increased by a predetermined amount so as to make the air/fuel ratio of a mixture being supplied to the engine richer than a theoretical mixture ratio. Preferably, the above predetermined speed is set at a value which is a maximum value of rpm above which the catalyst bed temperature of the exhaust gas purifying means will exceed a predetermined maximum allowable value, if the air/fuel ratio is controlled to the theoretical mixture ratio or a value close thereto. Further, preferably, the above predetermined fuel amount by which the fuel quantity is increased in the above predetermined high speed operating region is set to larger values as the intake pipe absolute pressure increases.

REFERENCES:
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patent: 4319451 (1982-03-01), Tajima
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patent: 4388903 (1983-06-01), Yoshida

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