EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE

• Main Author: AOYAMA TARO
• Format: Patent
• Language: English
• Published: 17.02.2011
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; 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; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; WEAPONS

There is provided a technology that enables easier adjustment of the temperature of an exhaust gas purification apparatus to a target value by supplying an appropriate quantity of fuel to the exhaust gas purification apparatus even in the case where sub-injection and exhaust addition are performed in an exhaust gas purification system for an internal combustion engine. The system includes a fuel addition valve that adds fuel to the exhaust gas in an exhaust passage upstream of the exhaust gas purification apparatus and unburned fuel discharge unit for discharging gas containing unburned fuel from the combustion chamber of the internal combustion engine to the exhaust passage, wherein when supplying fuel to the exhaust gas purification apparatus to make the temperature of the exhaust gas purification catalyst equal to a target temperature, the quantity of fuel supplied by the fuel addition valve is controlled by a feedback control, and the quantity of fuel supplied by the unburned fuel discharge unit is controlled by an open-loop control.