EXHAUST EMISSION CONTROL DEVICE TEMPERATURE RISING SYSTEM AND TEMPERATURE RISING METHOD FOR EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device temperature rising system for an internal combustion engine that simultaneously enables efficient cooling of EGR gas and efficient temperature rising to a temperature necessary for activation of a catalyst of an exhaust emission control device by using part or all of the EGR gas for temperature rising of the catalyst of the exhaust emission control device in the internal combustion engine including an EGR system and an exhaust emission control system and that simultaneously enables reduction of fuel consumption in the internal combustion engine and reduction of an exhaust gas component, and a temperature rising method for the exhaust emission control device for the internal combustion engine.SOLUTION: An internal combustion engine 10 includes an EGR system 20 and an exhaust emission control system 30 disposed in an exhaust passage 15. A heat exchange mechanism 32 is arranged on the upstream side of an exhaust emission control device 31, and the heat exchange mechanism 32 is connected to EGR passages 21a, 21b of the EGR system 20. EGR gas Ge passing through the EGR passage 21a is made to pass through the heat exchange mechanism 32, so as to increase a temperature of exhaust gas Go passing through the exhaust emission control device 31.