Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1990-12-03
1991-09-17
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Fuel injection system
123520, F02D 4104, F02M 2508
Patent
active
050484931
ABSTRACT:
A system and method for controlling operation of an engine having a fuel vapor recovery system coupled between a fuel supply system and engine air/fuel intake. In response to a two-state exhaust gas oxygen sensor (EGO sensor), a feedback controller generates a desired fuel charge. This feedback controller is also responsive to an adaptive learning controller which provides corrections for long term air/fuel offsets caused by such factors as fuel injector variances. An adaptive fuel vapor learning controller measures fuel vapor concentration during purging operations of the fuel vapor recovery system. This adaptive fuel vapor learning controller provides a fuel vapor correction factor which is subtracted from the desired fuel charge to maintain proper air/fuel ratio operation during a fuel vapor purge. Purging operations are disabled when the measurement of fuel vapor concentration is below a preselected value. At that time, the offset learning controller is enabled for a preselected time. Purging operations occur until the learned measurement of fuel vapor content indicates purging is no longer necessary. Thereafter, adaptive offset learning is enabled for a preselected time. After such preselected time, adaptive offset learning is disabled, purging operations recommenced, nad adaptive vapor learning also reinitiated.
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Davenport Martin F.
Hamburg Douglas R.
Orzel Daniel V.
Abolins Peter
Ford Motor Company
Lippa Allan J.
Wolfe Willis R.
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