| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of efficiently regenerate an NOx storage reduction catalyst even in a relatively low temperature range and improving an NOx reduction rate while keeping deterioration of fuel economy minimum. <P>SOLUTION: An exhaust pipe 4 circulating exhaust gas 3 discharged from a diesel engine 1 via an exhaust manifold 2 is branched to two ways in a middle thereof and is merged again. An exhaust emission control means 8 including a fuel adding device 5, a heating device 6 and the NOx storage reduction catalyst 7 is arranged in a middle of each of the exhaust pipes 4 branched to two ways. An exhaust gas distribution change over means 9 distributing exhaust gas 3 to one of the exhaust emission control means 8 and limiting flow rate of exhaust gas to another is provided at a branch section of the exhaust pipe 4. <P>COPYRIGHT: (C)2007,JPO&INPIT |
