Air fuel ratio control system

Details Air fuel ratio control system Air fuel ratio control system

1994-04-05

1995-10-17

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

F02D 4106

Patent

active

054581028

ABSTRACT:
An air/fuel ratio control system for an internal combustion engine is effective for improving exhaust characteristics and fuel combustion efficiency. Air/fuel ratio control is carried out by monitoring combustion pressure and analyzing variations therein for frequencies indicative of surge torque. Upon detecting of such indications a map selection function selects data maps from memory for controling the air/fuel ratio to be gradually enriched according to a detected amount of surge torque. If the amount of surge torque is within a predetermined basic range, the system is active to perform lean control for reducing the air/fuel ratio such that the engine may always run as lean as possible without incurring torque loss due to an insufficiently rich air/fuel ratio.

REFERENCES:
patent: 4216750 (1980-08-01), Kobayashi
patent: 4543934 (1985-10-01), Morita et al.
patent: 5331933 (1994-07-01), Matsushita

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