Control of Active Regeneration

The active regeneration is carried out once the filter is plugged and when the pressure drop across the filter increases to the threshold level. The entire filter is plugged with soot. The regeneration process starts at the front end and progresses towards downstream.  Once the regeneration starts, heat released further heats-up the filter and soot burns at a progressively increasing rate. This may lead to uncontrolled rate of soot burning and high rates of heat release. Eventually, it may melt the filter substrate.  Therefore, the filter temperatures are to be monitored continuously. To control temperatures during regeneration, the burner may be shut off midway through the regeneration cycle to prevent melting of the filter substrate. The DOF regeneration is thus, a carefully controlled process.