EXHAUST EMISSION CONTROL DEVICE FOR CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To quickly make a reductant injection device available by efficiently thawing a frozen reductant.;SOLUTION: An exhaust emission control device for a construction machine comprises a first heating section 141a and a second heating section 142a in which cooling water heated by an engine 190 flows. The first heating section 141a is configured in such a manner that a coolant flows near intakes 135a and 135b of a reductant passage disposed within a reductant tank 140, and the second heating section 142a is configured in such a manner that the cooling water flows at a position more separated from the intakes 135a and 135b of the reductant passage than the first heating section 141a. When it is determined based on a temperature of the reductant that the reductant around the first heating section 141a is in a frozen state, the cooling water is led only into the first heating section 141a. When it is determined based on the temperature of the reductant that the reductant around the first heating section 141a is not in the frozen state but the reductant around the second heating section 142a is in the frozen state, the coolant is led into at least the second heating section 142a.;COPYRIGHT: (C)2014,JPO&INPIT