| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust emission control device having improved urea water utilizing efficiency without reducing fuel consumption. <P>SOLUTION: In an exhaust pipe 2 in which exhaust gas from a diesel engine 1 distributes, an oxidation catalyst 3, a SCR catalyst 4, an oxidation catalyst 5, and a DPF 6 are provided. Between the oxidation catalyst 3 and the SCR catalyst 4, an injection nozzle 7 is provided for injecting urea water. The injection nozzle 7 is communicated via a pipe 8 with a urea water tank 9 which stores the urea water. In the pipe 8, a urea water adding system 10 is provided for supplying the urea water from the urea water tank 9 into the injection nozzle 7. In starting the regeneration of the DPF 6, an ECU 14 stops the operation of the urea water adding system 10. During regenerating the DPF 6, it stops the addition of the urea water. <P>COPYRIGHT: (C)2010,JPO&INPIT |
