| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a temperature control device for an exhaust emission control device which allows temperature rise and rapid cooling of an exhaust gas purification means to facilitate wide temperature adjustment of the exhaust gas purification means. <P>SOLUTION: The temperature control device for the exhaust emission control device which raises temperature of exhaust air flowing into a DPF 21 provided in an exhaust passage 20 of an engine 1 to allow regeneration of the DPF 21 includes: an outside air introducing device 41 introducing outside air to an exhaust passage at an upstream side of the DPF 21; and a heat exchanger 53 provided in an exhaust passage 20 at a downstream side of the DPF 21 and allowing heat exchange between the exhaust air discharged from the DPF 21 and the outside air introduced by the outside air introducing device 41. In the device, by a switch valve 46, the outside air introduced into the exhaust passage 20 with the outside air introducing device 41 can be switched to the outside air subjected to heat exchange with the exhaust air through the heat exchanger 53 and the outside air introduced not through the heat exchanger 53. <P>COPYRIGHT: (C)2013,JPO&INPIT |
