Filter regeneration control

摘要

A regeneration control device, which regenerates a filter ( 13 ) for trapping particulate matter in exhaust gas from an engine ( 1 ), is disclosed. The filter ( 13 ) supports a catalyst which oxidizes unburnt components in the exhaust gas. The regeneration control device has a temperature sensor ( 14 ) which detects a filter inlet exhaust gas temperature (Tdpf_in_mea); and a microcomputer ( 22 ). The microcomputer ( 22 ) is programmed to compute a filter outlet exhaust gas temperature (Tdpf_out_cal), not including temperature rise due to oxidation reaction of unburnt components based on the detected inlet exhaust gas temperature; compute the filter bed temperature (Tbed_cal) based on the detected inlet exhaust gas temperature and computed outlet exhaust gas temperature; compute a temperature rise (DeltaThc 1 ) due to oxidation reaction of unburnt components; correct the bed temperature based on the computed temperature rise (DeltaThc 1 ).