Addition-amount controller for exhaust gas purifying agent and exhaust emission control system
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United States of America Patent
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Dec 25, 2012
Grant Date -
Jan 1, 2009
app pub date -
Jun 26, 2008
filing date -
Jun 27, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
In an addition-amount controller for an exhaust gas purifying agent to be used for an exhaust emission control system of an engine, one mode is executed based on satisfaction of an execution condition for each mode, from among a plurality of control modes. The control modes includes a purification control mode in which an addition amount of NH3 or an additive serving as a generating source of the NH3 is determined according to a predetermined parameter associated with an amount of NOx in the exhaust gas, and a storage control mode in which the addition amount is set to be larger than that in the purification control mode. When a load on an output shaft of the engine is higher than an allowable level, the execution condition of the storage control mode is determined to be satisfied.
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