Japanese Patent JPH0531664

B2

PURPOSE:To prevent an overrich state of fuel when an engine is accelerated, by stopping a fuel increase of acceleration in a predetermined time after starting it, in the case of a carburetor in which air-fuel ratio is feedback controlled by an exhaust sensor. CONSTITUTION:A control device 19, comprising a CPU20, memory 21 and an I/O port 22, controls air-fuel ratio in a carburetor 4 with a suitable correction coeffcient by the output of an exhaust sensor 8. When an engine is accelerated, the correction coefficient is increased from a required point of time so as to provide a rich state of fuel for acceleration by signals from an acceleration condition detecting means 13 and an acceleration degree detecting means 14. Following the above increase action, the air-fuel ratio is also controlled to a rich side, but fuel is increased richer than necessary because the air-fuel ratio dilutes gradually to a lean side even if the necessity of providing the rich state of fuel for acceleration is eliminated at a required point of time. In order to prevent this increase of fuel richer than necessary, correction for providing a rich state of fuel is immediately stopped after a predetermined time, being transferred to the correction in accordance with a degree of acceleration.

JP4546872	Closed-loop electronic control system for combustion control of diesel engines operating with high premixed combustion
JPS5439726	DEVICE FOR OPERATNG VACUUM SECONDARY VALVE IN DUAL CARBURETOR

OOKAWA YOSHIAKI
KATO SHINZO
IWASHITA KENJI
SHIMONOMURA SHIGERU

JP20508783A

May 13, 1993

October 31, 1983

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NISSAN MOTOR

F02M7/00; F02D41/00; F02D41/10; F02D41/14; F02M7/06

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