| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve the exhaust purifying performance and effectively clean the filters of an exhaust emission control system by constituting a purifying body by two, the first and second purifying chambers made through the splitting of an exhaust pipe in its halfway portion and arranged in parallel to each other and by arranging in the respective purifying chambers injection nozzles which selectively inject fluid to clean the filter SOLUTION: When the engine is running, a fluid force feed part 40 is controlled to force-feed fluid in an fluid tank 24 to a second fluid supply pipe 30-2 for example, which pipe is selected by the switching of a valve 16, and injects the fluid from a second fluid injection nozzle 32-2 toward the filter in a second purifying chamber 8-2 to clean the filter through the removal of products adhering thereto. At which time exhaust gas from the engine flows through a first fluid supply pipe 30-1, thus the fluid is not injected from a first fluid injection nozzle 32-1, and products in the exhaust gas is removed by the filter in a first purifying chamber 8-1. An ozone supply means 44 supplies ozone to oxidize Nox in the exhaust gas.</p> |
