System for purging sulfate from a NOx trap for a motor vehicle engine
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United States of America Patent
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Sep 1, 2009
Grant Date -
Jun 7, 2007
app pub date -
Nov 12, 2004
filing date -
Nov 25, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
System in which the NOx trap is associated with a catalyst integrated in an exhaust line of a vehicle engine, and in which the engine is associated with common manifold or “rail” fuel feeder for feeding it with fuel and adapted, by modifying control parameters for the operation of the engine, to cause the engine to switch between lean mixture operation and rich mixture, in which the fuel feeder is adapted to define three strategies for controlling lean mixture operation of the engine, and to cause the engine to switch between its various strategies in order to keep the trap in a temperature window of maximum effectiveness.
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