Title:
【発明の名称】内燃機関の空燃比制御装置
Document Type and Number:
Japanese Patent JP2917173
Kind Code:
B2
Abstract:
PCT No. PCT/JP91/01184 Sec. 371 Date May 1, 1992 Sec. 102(e) Date May 1, 1992 PCT Filed Sep. 4, 1991 PCT Pub. No. WO92/04538 PCT Pub. Date Mar. 19, 1992.An air/fuel ratio control method and system for an internal combustion engine employing first and second air/fuel ratio sensors, respectively upstream and downstream of a catalytic converter, sets and stores learnt correction values, by learning through an averaging process, for an air/fuel ratio correction value by a second air/fuel ratio sensor, stores a degree of progress of learning with respect to each learning, and modifies the learnt correction value with a modification ratio depending upon the degree of progress of learning. Accordingly, both a promotion of the learning and an enhancement of the accuracy of the learning can be achieved, and thus the emission control performance can be improved by progressively reducing an offset at the transition from an inactive state to an active state of the air/fuel ratio feedback control or at the transition of an engine driving range.
Inventors:
FURUYA JUNICHI
Application Number:
JP23249490A
Publication Date:
July 12, 1999
Filing Date:
September 04, 1990
Export Citation:
Assignee:
YUNISHIA JETSUKUSU KK
International Classes:
F02D41/14; F02D45/00; (IPC1-7): F02D41/14; F02D45/00
Domestic Patent References:
| JP422726A | ||||
| JP422725A |
Attorney, Agent or Firm:
Fumio Sasashima