EXHAUST EMISSION TREATMENT DEVICE

To suppress the unnecessary consumption of urea water while properly purifying NOx.SOLUTION: An exhaust emission treatment device performs treatment including the following steps of: a step (S104) for setting a consumption suppression mode when an engine is in a warmup finish state (YES in S100), an...

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1. Verfasser:	KITANO TAKAYUKI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	BLASTING ENGINE PLANTS IN GENERAL GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MECHANICAL ENGINEERING STEAM ENGINES WEAPONS
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Zusammenfassung:	To suppress the unnecessary consumption of urea water while properly purifying NOx.SOLUTION: An exhaust emission treatment device performs treatment including the following steps of: a step (S104) for setting a consumption suppression mode when an engine is in a warmup finish state (YES in S100), and an SCR catalyst is in a warmup finish state (YES in S102); a step (S106) for calculating a target value of a NOx discharge amount; a step (S108) for calculating the NOx discharge amount; a step (S110) for controlling an addition amount of urea water so that the NOx discharge amount reaches the target value; and a step (S112) for performing normal control when the engine is not in the warmup finish shaft (NO in S100), and the SCR catalyst is not in the warmup finish state (NO in S102).SELECTED DRAWING: Figure 3 【課題】ＮＯｘを適切に浄化しつつ、不必要な尿素水の消費を抑制する。【解決手段】エンジンが暖機完了状態であって（Ｓ１００にてＹＥＳ）、かつ、ＳＣＲ触媒が暖機完了状態である場合（Ｓ１０２にてＹＥＳ）、消費抑制モードを設定するステップ（Ｓ１０４）と、ＮＯｘ排出量の目標値を算出するステップ（Ｓ１０６）と、ＮＯｘ排出量を算出するステップ（Ｓ１０８）と、ＮＯｘ排出量が目標値になるように尿素水の添加量を制御するステップ（Ｓ１１０）と、エンジンが暖機完了状態でなかったり（Ｓ１００にてＮＯ）、ＳＣＲ触媒が暖機完了状態でなかったりすると（Ｓ１０２にてＮＯ）、通常制御を実行するステップ（Ｓ１１２）と含む、処理を実行する。【選択図】図３