EXHAUST EMISSION CONTROL APPARATUS OF INTERNAL COMBUSTION ENGINE

• Main Authors: ODA TOMIHISA, ITO TAKEKAZU, WATABE SATORU, TAUCHI YUTAKA, NAKAMURA YOSHITAKA, TOSHIOKA TOSHISUKE
• Format: Patent
• Language: English
• Published: 04.12.2008
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; COMBUSTION ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INTERNAL-COMBUSTION PISTON ENGINES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide an exhaust emission control apparatus capable of inexpensively and surely detecting abnormality of urea water. SOLUTION: An NOx selective reduction catalyst 15 is arranged in an engine exhaust passage, and NOx is selectively reduced by supplying the urea water stored in a urea water tank 20 to the NOx selective reduction catalyst 15. Whether or not the urea water is replenished in the urea water tank 20 is determined by detecting that a urea water replenishing port 40 of the urea water tank 20 is opened and closed, and when operating an engine just after replenishing the urea water in the urea water tank 20, when determining that the NOx purification ratio is reduced up to an allowable level or less, it is determined that the replenished urea water is abnormal. COPYRIGHT: (C)2009,JPO&INPIT