Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1999-01-15
2000-11-28
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123357, F02M 3704
Patent
active
061521167
ABSTRACT:
An appropriate learning of volumetric efficiency of an engine is ensured prior to enabling any purge flow, purge vapor learning or compensation. The volumetric efficiency of the engine is modeled is a matrix including a plurality of cells corresponding to an operating condition of the engine such as engine speed and manifold absolute pressure. Each cell is varied between a first mode and a second mode according to the learned state of volumetric efficiency for the corresponding operating condition based on oxygen sensor feedback. If the accessed cell of the matrix is in the first mode, then the volumetric efficiency for that operating condition has not yet been learned to within an acceptable tolerance. As such, any purge vapor concentration learning or compensation is disabled. If the accessed cell of the matrix is in the second mode, then the volumetric efficiency for that operating condition has been learned to within an acceptable tolerance. As such, purge flow, purge concentration learning and compensation is enabled.
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Calcaterra Mark P.
DaimlerChrysler Corporation
Miller Carl S.
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