Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Yasuhiro Hattori

Daisuke Sato

Tomohide Yamada

Kazuki Nishizawa

A regeneration control device controlling a temperature increase unit of an exhaust gas treatment device including a DOC disposed in an exhaust passage of a diesel engine to regenerate the exhaust gas treatment device includes: a DOC temperature-increase-necessary-state detection part detecting a temperature increase necessary state including at least one of a blockage state, detected on the basis of comparison between a blockage parameter related to blockage of the DOC and a predetermined blockage threshold, of the DOC or a blockage risk state, detected when the diesel engine is in an operating state that is likely to cause blockage of the DOC, of the DOC; and a DOC temperature increase execution part executing a DOC temperature increase control including: a first temperature increase process to control the temperature increase unit, if the temperature increase necessary state of the DOC is detected, so as to increase the temperature of the DOC to a first temperature at which the DOC activates; and a second temperature increase process to control the temperature increase unit after completion of the first temperature increase process so as to increase the temperature of the DOC to a second temperature higher than the first temperature.

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Tokyo, Japan

Yasuhiro Hattori