| 摘要 |
<p>PURPOSE:To enable correct judgement of the timing at which an exhaust particulates collecting trap is needed to be repurified, by detecting both exhaust pressure in the vicinity of an exhaust port and exhaust pressure just behind the trap and actuating a burner device according to the difference between those pressures so as to repurify the trap. CONSTITUTION:Exhaust particulates in exhaust gas is collected by a trap 26 which is disposed in an exhaust passage 25. When the trap 26 becomes clogged with particulates while the collection proceeds, differential pressure detected by a controller according to pressure signals fed from the first and second pressure sensors 38 and 41 which detect a high exhaust pressure at the exhaust outlet of the turbine 22b of a supercharger and another exhaust pressure just behind the trap is increased. When the differential pressure reaches a specified value and the timing at which trap is required to be repurified is discriminated, a glow plug 43 is electrified and preheated. Fuel cut-off valve 31, a fuel injection valve 29 and a change-over valve 36 are then actuated to have the burner device 27 operate to burn the collected particulates.</p> |
