| 摘要 |
<p>PURPOSE:To prevent estimate drift incompliance with a change in pressure loss by compensating pressure loss of a filter by engine speed, correcting the compensated result according to regenerated times of the filter, and estimating particulate collected quantity according to the corrected results. CONSTITUTION:The exhaust pipe 3 of diesel engine 20 is connected to the upstream side of a case 1 containing a filter 2. An upstream side pressure sensor 7, a temperature sensor 6, a heater 11 and a downstream side pressure sensor 17 are arranged in the case 1 in order. An air supply pipe 10 branched from the exhaust pipe 3 is connected to a blower 13 via a solenoid valve 14. And the heater 11 and the blower 13 are controlled by a controller 8 based on respective detection signals from respective sensors 6, 7, 17 and an engine speed sensor 18. Namely, pressure loss of the filter 2 is compensated by the engine speed, the compensated result is collected according to regenerated times of the filter 2, and particulate collection quantity is estimated according to the corrected result.</p> |
