| 摘要 |
In a thermal-maintaining device ( 40 ) which is mounted to thermally maintain a pipe ( 3 ) for supplying urea water solution U stored in the inside of a tank ( 2 ) to an exhaust gas post-treatment device ( 100 ), a selecting part ( 50 ) which selectively outputs an ambient temperature signal (S 2 ) when it is determined that the urea water solution (U) in the inside of the pipe ( 3 ) is frozen based on a flow state of the urea water solution (U) in the inside of the pipe ( 3 ), and selectively outputs a tank temperature signal (S 1 ) when it is determined that the urea water solution (U) in the inside of the pipe ( 3 ) flows is provided. Further, a drive current (Y) necessary for thermal-maintenance is supplied to a heater ( 17 A) in response to an output signal (S 3 ) from the selecting part ( 50 ).
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