PARTICULATE MATTER DEPOSITION AMOUNT ESTIMATION DEVICE, EXHAUST GAS PURIFICATION SYSTEM, AND PARTICULATE MATTER DEPOSITION AMOUNT ESTIMATION METHOD

摘要

There are provided a differential pressure deposition amount of PM deposited in a DPF based on an exhaust gas flow rate and a differential pressure of the DPF, calculating a model deposition amount of the PM using a model in which a PM amount burned in the DPF is subtracted from the PM amount, calculating a time change rate of the differential pressure deposition amount, and setting a first coefficient to be larger than a second coefficient when the exhaust gas flow rate exceeds a predetermined value and setting the first coefficient to be small when the exhaust gas flow rate exceeds the predetermined value and the time change rate is a predetermined threshold or more when multiplying the differential pressure deposition amount and the model deposition amount by the first and second coefficients, respectively, and calculating an addition value of the respective multiplied values as the PM deposition amount.