CONTROL DEVICE, EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE, AND CONTROL METHOD OF EXHAUST EMISSION CONTROL DEVICE

• Main Author: TANIOKA KENICHI
• Format: Patent
• Language: English; Japanese
• Published: 27.11.2014
• Subjects: 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

PROBLEM TO BE SOLVED: To suppress superheating of a reducing agent injection valve due to sucking-back of urea water in a system including the reducing agent injection valve for injecting an urea water solution to an exhaust passage.SOLUTION: A control device 60 includes a signal receiving portion 62 for receiving a signal, an error detecting portion 64 detecting error of the received signal, and a reducing agent supply executing portion 69 continuing supply of a reducing agent to a reducing agent injection valve 34 for injecting the reducing agent to an exhaust passage 11 when the error is detected. As the supply of the reducing agent to the reducing agent injection valve 34 is continued even in occurrence of error, superheating of the reducing agent injection valve can be suppressed by heat exchange by the reducing agent. 【課題】尿素水溶液を排気通路に噴射する還元剤噴射弁を備えたシステムにおいて、尿素水の吸い戻しによる還元剤噴射弁の過熱を抑止する。【解決手段】本発明に係る制御装置６０は、信号を受信する信号受信部６２と、受信した信号のエラーを検出するエラー検出部６４と、エラーが検出された場合に、排気通路１１へ還元剤を噴射する還元剤噴射弁３４に対する還元剤の供給を継続する還元剤供給実行部６９と、を備える。これにより、エラーが発生した場合であっても、還元剤噴射弁３４に対する還元剤の供給が継続されるため、還元剤による熱交換によって還元剤噴射弁の過熱を抑止することが可能となる。【選択図】図２