Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1998-12-02
1999-11-09
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123357, F02M 3704
Patent
active
059794194
ABSTRACT:
An air-fuel ratio controlling apparatus for an internal combustion engine allows an air-fuel ratio learning control to be executed to a satisfactory extent during manufacture in a factory to thereby stabilize exhaust gases and driving performance. The apparatus is provided with a controller which sets air-fuel ratio learning execution counters in a plurality of learning zones. The counters judge whether an air-fuel ratio learning has been executed in an air-fuel ratio learning value storage map based on engine revolutions and engine load, and execute a forced learning control with the amount of purge as a fixed value where the air-fuel ratio learning is not performed at least a preset number of times in all the learning zones with the air-fuel ratio learning execution counters set therein.
REFERENCES:
patent: 5176123 (1993-01-01), Hosoda
patent: 5609142 (1997-03-01), Osanai
patent: 5634451 (1997-06-01), Tomisawa
patent: 5694904 (1997-12-01), Osanai
patent: 5735255 (1998-04-01), Farmer
patent: 5765541 (1998-06-01), Farmer
patent: 5767395 (1998-06-01), Goto
patent: 5850820 (1998-12-01), Tsutsumi
Miller Carl S.
Suzuki Motor Corporation
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