Utilization of air-assisted direct injection, cylinder deactivation and camshaft phasing for improved catalytic converter light-off in internal combustion engines
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United States of America Patent
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-
Dec 30, 2003
Grant Date -
Aug 21, 2003
app pub date -
Feb 19, 2002
filing date -
Feb 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vehicle engine control system controls an engine that includes a plurality of cylinders and that generates exhaust gas. An air-assisted direct injection fuel system supplies an air/fuel mixture to the cylinders. A catalytic converter reduces harmful emissions from the exhaust gas after the catalytic converter reaches a light-off temperature. A controller communicates with the engine, the catalytic converter and the air-assisted direct injection fuel system. The controller optimizes cam phasing, the air/fuel mixture and spark angle for full and partial engine operating modes. The controller deactivates at least one of the cylinders of the engine before the catalytic converter achieves the light-off temperature to hasten light-off of the catalytic converter.
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