| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent a lowering of engine performance while automatically switching an exhaust gas flow passage when a trap filter is clogged by opening a trap pipe in the case where the engine exhaust pressure is lower than the set value so as to hold a burning device of the particulate trap filter in the ON condition. SOLUTION: In a control device 27 for burning device 18 for regenerating a particulate trap filter 16, a temperature discriminating means 33 compares the all detected temperature with the set temperature so as to discriminate whether the detected temperature is lower than the set temperature or not, and in the case of YES, a trap pipe 15 is opened and a branch pipe 14 is closed so as to hold a burning device 18 in the ON condition. In the case where any one temperature is higher than the set temperature, the trap pipe 15 is closed and the branch pipe 14 is opened so as to hold the burning device 18 in the OFF condition. In the case where the engine exhaust pressure is lower than the maximum set exhaust pressure, a pressure comparing means 34 outputs a command for opening the trap pipe 15 to a first operating valve 20 so as to hold the burning device 18 in the ON condition, and the filter 16 is thereby regenerated.</p> |
