Control system for internal combustion engines
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United States of America Patent
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Sep 21, 1993
Grant Date -
N/A
app pub date -
Aug 20, 1992
filing date -
Aug 20, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A control system (10) controls fuel injected into an internal combustion engine (14) having a fuel vapor recovery system (74) coupled to the air/fuel intake. To achieve stoichiometric combustion, delivery of liquid fuel is trimmed by a feedback variable (32) responsive to an exhaust gas oxygen sensor (26) and a learned value (40) representing quantity of recovered fuel vapor. Learning (40) is inhibited when an indication is provided of air/fuel operation rich of stoichiometry which is caused by factors other than vapor recovery.
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