Kubota Corporation

Katsushi Inoue

Yuuki Ishii

Masanori Fujiwara

Yasuo Fujii

Shuichi Yamada

Masahiko Sugimoto

Kenta Mitamura

Mikio Ishida

Toshio Nakahira

Tamotsu Kuno

Hiroaki Okano

Kentaro Kita

Yongchol Lee

Tomohiro Ninomiya

Noriyoshi Eguchi

Masahiro Aketa

Koichi Funaki

Yuki Yoshita

Kazunari Tsujino

Akihiko Kai

Yusuke Komemushi

Hirozumi Kuwabara

Gen Nakamura

Hiroki Murata

Kentarou Kita

Yuuji Takemura

Tomoya Hasegawa

Hideo Shimoji

Ryota Sakai

Kouji Horikiri

Yasuo Fuji

There is provided an exhaust treatment device for a diesel engine capable of accurately estimating an amount of ash deposition. In the exhaust treatment device, an ash deposition estimation device estimates an amount of ash deposition on a DPF after ending of regenerating treatment for the DPF, based on data regarding differential pressure and exhaust flow rate stored in a memory device over a period immediately before the end of regeneration, the period ranging from the end point of regenerating treatment for the DPF to a point in time going back a predetermined duration. An electronic control device preferably makes an alarm device issue an alarm, upon arrival of an estimated value of ash deposition at a predetermined alarm request value.

Exhaust treatment device for diesel engine

An engine promoting DPF regeneration processing is provided. Catalyst activation processing and thereafter DPF regeneration processing are performed under control of a device. In the catalyst activation processing, a target temperature of exhaust at an exhaust exit of a catalyst is set to be in a first temperature region, and then the opening degree of an exhaust throttle device is controlled. In the DPF regeneration processing, the target temperature is set to be in a second temperature region. A target temperature of the exhaust at an exhaust inlet of a DPF is set to be in a third temperature region. The opening degree of the exhaust throttle device is controlled, and unburned fuel is supplied into the exhaust. The temperature regions are set to be successively higher, and a temperature difference between successive temperature regions is set to be successively lower.

Engine

An engine promoting activation of a catalyst is provided, including an exhaust manifold, an exhaust lead-out path led out from a manifold exit of the exhaust manifold, a catalyst case provided on the exhaust lead-out path, and a catalyst housed in the catalyst case. The exhaust manifold and the catalyst case are extended in the front-back direction of crankshaft extension and disposed side by side orthogonally to the front-back direction. The engine may further include a supercharger attached to the exit of the exhaust manifold, and the catalyst case is attached to a turbine exit of the supercharger. The engine may further include an exhaust relay pipe attached to the exit of the exhaust manifold, and the catalyst case is attached to a relay pipe exit of the exhaust relay pipe. The engine may further include an exhaust throttle device provided on an exhaust downstream side of the catalyst.

There is provided an exhaust treatment device for a diesel engine that can prevent unnecessary alarm for ash deposition from being issued. In the exhaust treatment device, a timer measures integrated time of a state of non-regenerative operation which ranges from an end of DPF regeneration to a next time point where the differential pressure reaches a regeneration request value. A counter acquires the short interval count if the integrated time is a short interval shorter than a predetermined decision time. An alarm device issues an alarm if the consecutive short interval count reaches a predetermined plural necessary count for alarm. A short interval count having been already acquired is preferably reset to 0 if the integrated time of the state of non-regenerative operation is a long interval, not shorter than a predetermined decision time, before the short interval count reaches the predetermined necessary count for alarm.

A fluid heating device of an engine is provided that is capable of reducing power consumption of a heat source required for heating a fluid. The fluid heating device of the engine includes a heat radiation pipe through which a fluid passes and an induction heating coil. Heat of the heat radiation pipe that is inductively heated by the induction heating coil is radiated to the fluid. A whole periphery of the heat radiation pipe is surrounded by the induction heating coil. The induction heating coil is supported by the heat radiation pipe. A holder is included, and the induction heating coil is supported by the heat radiation pipe via the holder. The holder, to which the induction heating coil is attached, is detachably supported by the heat radiation pipe.

Fluid heating device of engine

An exhaust apparatus for a diesel engine rapidly burns an unburned deposit in an upstream exhaust catalyst with heat of a heater. The exhaust apparatus includes a downstream exhaust cleaner, an upstream exhaust catalyst provided in an exhaust passage, upstream of the downstream exhaust cleaner, a heater disposed at an exhaust inlet of the upstream exhaust catalyst, and an engine starter apparatus. A control unit controls the power supply to the heater and an engine start process is performed by the engine starter apparatus. A start command unit is connected to the control unit. When the engine has been stopped and then the start command unit gives the control unit a start command, the control unit powers the heater without performing an engine start process, thereby keeping the engine stopped for a predetermined period of time after the start command has been given, and subsequently performing the engine start process.

Exhaust apparatus for diesel engine

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.

Exhaust-gas processing device for a diesel engine

The present invention has an object to provide an exhaust device for a diesel engine capable of surely burning flammable gas in an exhaust route. In the exhaust device for the diesel engine, liquid fuel () is supplied from a liquid-fuel supply source () to a gas generator (). The gas generator () converts the liquid fuel () to flammable gas () and has a flammable-gas flow outlet () of the with which an exhaust route () is communicated upstream of a diesel-particulate-filter (). The flammable gas () flowed out from the flammable-gas flow outlet () is burnt with oxygen in exhaust gas () to produce combustion heat. The exhaust gas () heated by the thus produced combustion heat can burn the exhaust-gas fine particles remaining at the filter (). The gas generator () is provided with a catalyst chamber () which houses a catalyst (). Catalyst-combustion heat is generated in the catalyst chamber () which is arranged along an external periphery of a peripheral wall () of the exhaust route ().

Exhaust device for a diesel engine

An exhaust device for a diesel engine supplies liquid fuel () from a supply source () of the liquid fuel () to a gas generator () which converts the liquid fuel () to flammable gas () and from which a flammable-gas supply passage () is conducted, the flammable-gas supply passage () having a flammable-gas outlet () communicated with an exhaust-gas route () upstream of a diesel-particulate-filter (), the flammable gas () flowed out of the flammable-gas outlet () being burnt in exhaust gas () to generate combustion heat which can burn fine particles of the exhaust gas () remaining at the filter (). In this exhaust device for a diesel engine, a case () for containing the filter () accommodates at least part of the gas generator ().

Growing community of inventors

Sakai, Japan

Katsushi Inoue