| 摘要 |
<p>An exhaust gas control apparatus for an internal combustion engine includes: a DPF provided in an exhaust passage of an internal combustion engine, which traps PM in exhaust gas discharged from the engine; and a differential pressure sensor used to estimate the amount of PM accumulated in the DPF. The temperature of the exhaust gas that flows through the DPF is raised (S102), if the PM accumulated amount, estimated based on the value output from the differential pressure sensor, is less than or equal to a predetermined amount (YES in S 101). The predetermined amount is a threshold used to determine whether the porosity of pores in cell walls of the DPF is so high that the likelihood that a nanoparticle included in the PM passes through the DPF is high or the porosity thereof is so low that the likelihood that the nanoparticle passes through the filter is low.</p> |
