| 摘要 |
PURPOSE:To use a filter continuously by eliminating the exhaust particulate piled on a filter without using a reconditioning device for recondition a filter with a burner, which gives a damage to the fuel economy and a heater, which invites the increase of the capacity of a buttery or a motor. CONSTITUTION:A first after-treatment device 34 provided with a filter 31 and the catalyst 33 and a second after-treatment device 36 provided with a filter 35 are located in parallel with each other. When the collection quantity of the exhaust particulate exceeds a predetermined quantity, and at the time of reconditioning the filter 31 and 35, a part of the exhaust passed through one after-treatment device is passed through the other after-treatment device by the inverted flow, and with this passed exhaust, the particulate collected by the other after-treatment device is fed back to an intake system to burn it in a combustion chamber. |
