| 摘要 |
<P>PROBLEM TO BE SOLVED: To constantly induce ammonia production reaction on an upstream side of an SCR catalyst, and to suppress deterioration in thermal efficiency of an internal combustion engine by removing condensed water, which is produced on an outlet side of an intercooler, from suction air. <P>SOLUTION: A condensed water storage tank 28 is provided in an outlet of an intercooler 26, and a condensed water produced in the intercooler 26 is stored in the condensed water storage tank 28. The condensed water storage tank 28 and an upstream-side exhaust pipe 18 of a catalyst converter 50 are connected by a water vapor supply pipe 68, and an electric heater 70 is arranged on an outer peripheral surface of the water vapor supply pipe 68. When an exhaust temperature of an urea aqueous solution supply area does not reach an ammonia production temperature, the condensed water c is heated by the electric heater 70 and turned into water vapor s, and the water vapor is sprayed on the urea aqueous solution supply area. Consequently, the exhaust temperature is set equal to or higher than the ammonia production temperature, and ammonia production and NOx detoxification reaction can be maintained. <P>COPYRIGHT: (C)2013,JPO&INPIT |
