To shorten development time by enabling estimation of characteristic temperature by successfully combining a temperature characteristic of a filter represented as a physical model with filter outlet temperature and filter inlet temperature.
This exhaust gas after-treatment device for a diesel engine is provided with a means (16) having the filter (4) for collecting and accumulating particulates of exhaust gas and detecting temperature of either upstream or downstream side of the filter (4) as first temperature; a means (17) detecting temperature of the other of upstream or downstream side of the filter (4) as second temperature; a means (11) calculating estimated bed temperature of the filter (4) based on at least either of the first or second temperature; and a means (11) increasing exhaust temperature based on the estimated bed temperature and performing regeneration treatment of the filter (4). The exhaust gas after-treatment device for the diesel engine is further provided with a means (11) calculating estimated temperature of the second temperature of one of the upstream or downstream side of the filter (4) based on the first temperature of the other of the upstream or downstream side of the filter (4). The estimated bed temperature is determined, based on the detected second temperature and the estimated temperature of the second temperature.
KAWASHIMA JUNICHI
NAKANO MASAHIKO
KONDO MITSUNORI
OTAKE MAKOTO
TSUTSUMOTO NAOYA
KOGA TOSHIMASA
Yoshio Matsuda
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