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ADDITION-AMOUNT CONTROLLER FOR EXHAUST GAS PURIFYING AGENT AND EXHAUST EMISSION CONTROL SYSTEM

  • US 20090000278A1
  • Filed: 06/26/2008
  • Published: 01/01/2009
  • Est. Priority Date: 06/27/2007
  • Status: Abandoned Application
First Claim
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1. An addition-amount controller for an exhaust gas purifying agent, the controller being applied to an exhaust emission control system for purifying exhaust gas emitted from an internal combustion engine, the exhaust emission control system including a catalyst for promoting a specific exhaust gas purification reaction in a temperature range having a critical reaction temperature as a lower limit, and an addition valve for adding an additive of NH3 (ammonia) or an additive serving as a generating source of the NH3 to the catalyst itself or the exhaust gas on an upstream side with respect to the catalyst, the additive being adapted to purify NOx (nitrogen oxides) in the exhaust gas by the exhaust gas purification reaction on the catalyst, the addition-amount controller being adapted to control an amount of addition by the addition valve, the catalyst having properties of storing NH3 and further decreasing the critical reaction temperature as the amount of NH3 storage is increased, the addition-amount controller comprising:

  • mode selection means for selecting one mode to be executed at that time based on satisfaction of an execution condition for each mode, from among a plurality of control modes, the control modes including a purification control mode in which the addition amount by the addition valve 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 by the addition valve is set to be larger than that in the purification control mode; and

    condition determining means for determining whether a rotation speed of an output shaft of the internal combustion engine is decelerated from a higher speed state than an allowable level,wherein the execution condition of the storage control mode is set to be satisfied after a predetermined dissatisfaction time period from start of the deceleration when the condition determining means determines that the rotation speed is decelerated from the higher speed state.

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