Controller for cylinder cut-off type internal combustion engine
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United States of America Patent
Stats
-
Jun 25, 2002
Grant Date -
Aug 23, 2001
app pub date -
Feb 1, 2001
filing date -
Feb 17, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A controller for a cylinder cut-off type internal combustion engine is provided for ensuring an activated state of catalysts in cylinders, which are stopped during a partial cylinder operation, at all times to maintain favorable emission characteristics upon switching from the partial cylinder operation to a full cylinder operation, and for maintaining a satisfactory fuel consumption rate by conducting the partial cylinder operation to the utmost. The cylinder cut-off type internal combustion engine can be switched between the partial cylinder operation and the full cylinder operation. Exhaust gas from cylinders in a right bank, which are switched off during the partial cylinder operation, and from cylinders in a left bank is purified by two catalyst units in exhaust pipes independent of each other. The controller estimates an estimated catalyst temperature of the catalyst for the right bank, and disables the partial cylinder operation when the estimated catalyst temperature is below a predetermined temperature.
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