Kubota Corporation

Yuuki Ishii

Katsushi Inoue

Yasuo Fujii

Kenta Mitamura

Shuichi Yamada

Masanori Fujiwara

Yongchol Lee

Tomohiro Ninomiya

Noriyoshi Eguchi

Tamotsu Kuno

Yusuke Komemushi

Kentarou Kita

Yuuji Takemura

Tomoya Hasegawa

Yasuo Fuji

The present invention provides a diesel engine capable of preventing a PM accumulation amount from increasing excessively. If DOC inlet exhaust gas temperature ('IEGT') does not reach a predetermined value T0, a control unit carries out air intake amount feedback control ('AIAFC'), and a target value of intake throttling is set to a predetermined air intake amount. If the DPF regenerating processing is not started even if elapsed time reaches a predetermined value t after AIAFC is started in a state where the DOC IEGT does not reach the predetermined value T0, the control unit changes AIAFC to exhaust gas temperature feedback control (&#x201c;EGTFC&#x201d;). In EGTFC, the control unit changes a target value of intake throttling to a predetermined DOC IEGT T0. If application of a load exceeding a predetermined amount is detected before the DOC IEGT reaches the predetermined value T0, the control unit returns EGTFC to AIAFC.

Diesel engine with reduced particulate material accumulation and related method

An exhaust gas processing device for a diesel engine includes a DPF, a PM deposition amount estimating unit for PM deposited in the DPF, a DPF regenerating unit, a DPF regeneration control unit, a storage unit, an acceleration regeneration request information notifying unit, an acceleration regeneration start operating unit, and a mode selecting unit. When a normal regeneration process is selected, the time at which acceleration regeneration request determination reserve period Telapses from the start of the normal regeneration process without the end of the normal regeneration process is time Tfor acceleration regeneration request determination, at which time, if the PM deposition amount estimation value is greater or equal to acceleration regeneration request determination value J, it is determined that there is the acceleration regeneration request. The DPF regeneration control unit allows the acceleration regeneration request information notifying unit to start notification of the acceleration regeneration request information.

Exhaust gas processing device for diesel engine

Provided is an exhaust gas processing device for a diesel engine which can carry out sufficient regeneration processing of a DPF. A DPF regeneration control section continues normal regeneration processing by a DPF regeneration control section when an accelerated regeneration starting operation section does not perform accelerated regeneration starting operation after notification of accelerated regeneration requiring information is started. The DPF regeneration control section prohibits the normal regeneration processing, and an accelerated regeneration re-requirement notification section starts notification of accelerated regeneration re-requiring information, when a PM accumulation amount estimate becomes equal to or higher than an accelerated regeneration re-requirement determination value J. Thereafter, the regeneration processing of the DPF is not carried out unless the accelerated regeneration starting operation section starts the accelerated regeneration starting operation to cause the DPF regeneration control section to carry out the accelerated regeneration processing by the DPF regeneration section.

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

The present invention has an object to provide an exhaust-gas processing device for a diesel engine, able to inhibit the deterioration of the fuel-consumption and the output reduction. In order to accomplish the above object, the device is provided with a DPF, a means for presuming the amount of PM to be deposited on the DPF, a DPF-regeneration means, a DPF-regeneration control means, a storing means, a means for sending message to demand an accelerated regeneration, and an operation means for starting the accelerated regeneration. While a normal regeneration processing is being continued (S) since it has started (S), the time when a term (T) for reserving judgment as to the demand for accelerated regeneration has elapsed is taken as the judging time (T). At this judging time (T), if the assumed value of the PM deposed amount exceeds a value (J) for judgment as to the demand for accelerated regeneration, the accelerated regeneration is deemed to be demanded. Then the DPF-regeneration control means allows the means for sending message to demand the accelerated regeneration to start (S) sending the message to demand the accelerated regeneration.

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Sakai, Japan

Yuuki Ishii