Kubota Corporation

Kenta Mitamura

Katsushi Inoue

Yasuo Fujii

Yuuki Ishii

Masanori Fujiwara

Noriyoshi Eguchi

Shuichi Yamada

Yongchol Lee

Tomohiro Ninomiya

Yasuo Fuji

The disclosed exhaust treatment device for a diesel engine can prevent heat damage to a DPF when regenerating said DPF. If a selection device (), which selects whether to allow or prohibit an automatic DPF regeneration process, is set to prohibit the automatic DPF regeneration process, a DPF regeneration control device () is made able to start a process to cancel execution of the automatic DPF regeneration process. If the selection device () is set to allow the automatic DPF regeneration process, the DPF regeneration control device () retracts the cancellation of the automatic DPF regeneration process, allowing execution of the previously-cancelled automatic DPF regeneration process to begin.

Exhaust treatment device for a diesel engine

Provided is an exhaust-treatment device for a diesel engine, said device being capable of suppressing engine noise. In a first stage Pof an exhaust-temperature-raising process, a target engine speed is set to a prescribed first target speed Rand an intake throttle valveis set to a prescribed first degree of opening O. In a second stage P, the target engine speed is maintained at the first target speed Rand the intake throttle valveis set to a position more closed than the first degree of opening O. When a set duration Tfor the second stage Phas come to an end, the intake throttle valveis at a second degree of opening O, which is maintained in third and subsequent stages P/P. In said third and subsequent stages P/P, as a set duration T/Tfor each stage P/Ppasses, the target engine speed is updated to a target speed R/Rhigher than the target speed R/Rduring the immediately prior stage P/P, and the temperature of DPFupstream exhaust gasis increased.

An object of the present invention is to provide the exhaust treatment device of a diesel engine which is capable of prohibiting the execution of DPF regenerating processing in a situation in which the DPF regenerating processing is inappropriate. In order to achieve the object, DPF regenerating mode switch manipulation means () switches a DPF regenerating mode to a normal and acceleration coexistence regenerating mode () or an acceleration-sole regenerating mode (), and DPF regenerating selection manipulation means () switches a position to a normal regenerating permission position (), a normal regenerating cancel position (), or an acceleration regenerating execution position (). When the DPF regenerating mode is in the acceleration-sole regenerating mode (), the DPF regenerating control means prohibits normal regenerating processing by the DPF regenerating means irrespective of a position selected by the DPF regenerating selection manipulation means ().

Exhaust treatment device of diesel engine

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Sakai, Japan

Kenta Mitamura