| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology enabling to control quantity of exhaust gas and quantity of reducing agent introduced in each exhaust emission control device by simple structure and control in an exhaust emission control system having two exhaust emission control devices combined in parallel. <P>SOLUTION: This system is provided with a rotary member 12 rotatably supported at a branch part 10c of an exhaust gas passage 5 branching to two branch passages in a middle. The rotary member 12 is provided with a reducing agent introduction passage 12c for introducing reducing agent to two branch passages 10a, 10b and exhaust communication passages 12f, 12g for making exhaust gas flow in two branch passages. The rotary member 12 is rotated to change opening area of the reducing agent introduction passage 12c and the exhaust gas communication passages 12f, 12g in relation to each of the two branch passages 10a, 10b. Consequently, quantity of auxiliary agent and exhaust gas flowing in each of the two branch passages 10a, 10b are controlled. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
