| 摘要 |
<p>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 (S2) 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 (S1) 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 (17A) in response to an output signal (S3) from the selecting part (50).</p> |
