| 摘要 |
<p>PURPOSE:To accurately estimate the quantity of collected particulate, and suppress the fluctuation of the collected particulate quantity at start of regeneration by relatively reducing corrective pressure loss to detected pressure loss, according to the increase of the flow of exhaust detected, and enlarging the ratio of reduction, according to the increase of the detected flow of exhaust. CONSTITUTION:The exhaust pressures detected by pressure sensors 7 and 17 are made P1 and P2, and the revolution (exhaust flow) of the engine detected by a revolution sensor 18 is made n. Corrective pressure loss DELTAPrqi=DELTAPX(523/ T)X(2600/n)X is sought by a correction formula so as to eliminate the influence of the revolution n to pressure loss (detected pressure loss), DELTAP=P1-P2 and the exhaust temperature detected by a temperature sensor 6. Here, 523 is reference exhaust temperature, and 2600 is reference engine revolution (reference exhaust flow), and index X is larger than 1. This device estimates the amount G of collection from the table which stores the relation between average corrective pressure difference DELTAPeqm and the quantity G of collected particulate from the memory built in a controller 8.</p> |
