| 摘要 |
<p>PURPOSE:To optimize a filter regeneration timing per filter by providing a before capturing pressure loss value detecting means which detects a filter pressure loss value before capturing particulates and a regeneration timing correcting means which captures a regeneration timing according to a filter pressure loss value. CONSTITUTION:In order to detect a rate of particulates captured by filters 2 and 3, differencial pressure sensors 15, 16 which detect a pressure loss value from exhaust pressures in front of and behind the filters 2 and 3 are provided. Their output signals are input to a control circuit 9. The control circuit 9 judges the particulate capturing condition of the filters 2 and 3 and a filter condition before regeneration based on the pressure loss value information of the filters 2 and 3 obtained through the differencial pressure sensors 15 and 16. Then it executes filter regeneration operation and lights an abnormality lamp 17. A regeneration timing is set in every filter, so that the regeneration timing is optimized in every filter. Regeneration malfunction, melting loss, and crack are prevented from occuring at the first regeneration.</p> |
