JP2008038855A - Particulate material-containing exhaust gas purifying method - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000011236 particulate material Substances 0.000 title 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003054 catalyst Substances 0.000 claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 230000003647 oxidation Effects 0.000 claims abstract description 4
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 4
- 239000013618 particulate matter Substances 0.000 claims description 36
- 238000000605 extraction Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 abstract description 40
- 101100224414 Caenorhabditis elegans dpf-1 gene Proteins 0.000 abstract description 2
- GWGQWFHTAOMUBD-UHFFFAOYSA-N [[3-[bis(phosphonomethyl)amino]-2-hydroxypropyl]-(phosphonomethyl)amino]methylphosphonic acid Chemical compound OP(=O)(O)CN(CP(O)(O)=O)CC(O)CN(CP(O)(O)=O)CP(O)(O)=O GWGQWFHTAOMUBD-UHFFFAOYSA-N 0.000 abstract description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 abstract 1
- 239000002956 ash Substances 0.000 abstract 1
- 239000004071 soot Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 238000000746 purification Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Filtering Of Dispersed Particles In Gases (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
本発明は粒子状物質含有排ガスの浄化方法に関し、特にディーゼルエンジン(DE)などの内燃機関からの排ガスに含まれる粒子状物質(PM)を除去するフィルタ(DPF)を用いる排ガスの浄化方法に関するものである。 The present invention relates to a method for purifying particulate matter-containing exhaust gas, and more particularly to a method for purifying exhaust gas using a filter (DPF) that removes particulate matter (PM) contained in exhaust gas from an internal combustion engine such as a diesel engine (DE). It is.
ディーゼル排ガス中の粒子状物質（PM，Particulate Matters)の除去に関する研究はDEメーカ及び自動車メーカを中心に各方面で行われており、優れた除去性能を有するフィルタや、酸化触媒により排ガス中の一酸化窒素(NO)を二酸化窒素(NO2)にして捕集したPMを酸化し、長期間詰まりを防止できるようにした研究・開発がなされている（非特許文献１）。これらの発明の多くは、多孔質セラミックスの薄壁に通して濾過することを目指し、板状または円筒状の金属、セラミックス焼結フィルタ、ハニカム状のセラミックス多孔体のガス流入部又は排出部の一方が、隣り合うセルで交互に封じられたDPF（ディーゼルパティキュレートフィルタ）などが広く用いられている。更に、これらにNOのNO2への酸化機能を付与し、低温から効率よく煤を燃焼することで長期間煤の詰まりを防止できるようにした技術などが知られている (特許文献１及び２）。
上記した従来技術を分散型電源装置などのDE排ガス中のPM除去に用いる場合の代表的なフローを図５及び図６に示す。これらの図において、ディーゼルエンジン７から排出された排ガスは、ディーゼルパティキュレートフィルタ（DPF）１に入って排ガス中のDPが除去され、浄化された排ガスはフィルタライン４を経て系外に排出される。この場合、流路切替手段３がDPFの前段（図５）または後段（図６）に設けられ、それぞれDPF１を迂回するバイパスライン５及び６を介してフィルタライン４に連結され、DPFの停止の場合のアイドリング操作（図５）やDPF内部の堆積物を除去するための抜き出し操作（図６）に用いられる。すなわち、DPFの停止操作では、停止信号の入力によりDEをアイドリング運転に切替え、その際、DPFのバイパスライン(図５の５)に排ガス流路を切替えたり、DPF内部の堆積物を抜出すライン(図６の６)に切替えたりする操作が行われる。
しかしながら、DPFにおけるPMの燃焼は、PMの堆積量とNO2濃度及び温度の関数で示され、停止時にバイパスラインに切替えてもDPF内部にPMは残存する。また、堆積物を抜出すラインでアイドリング運転を行った場合も排ガス温度は急速に低下するため、運転時の排ガス温度が400℃以下では、フィルタ内部などに残存する未燃分を酸化分解するのに十分な時間を確保できず、DPF内部に未燃の煤や灰が付着した状態で装置が停止される。その結果、装置を長期間停止した際には、吸水性の高い煤や灰分がフィルタ表面に固着するとともに、無機成分が溶解してDPFや触媒の細孔内に析出し、圧損上昇や触媒活性の低下を引き起こすという問題があった。また、再起動直後の高濃度のPMを処理することにより、セルの閉塞などのトラブルを引き起こし、急激な圧損上昇の要因となっている。
本発明の課題は、DE装置の長期間の停止時の吸湿によるDPF及び触媒の劣化を防止するために、排ガス温度400℃以下で運転しても、DPF内部に未燃分や灰が残らないように装置を停止することができる排ガス浄化方法、すなわちDPFの操作方法を提供することである。
FIGS. 5 and 6 show typical flows when the above-described conventional technology is used for removing PM in DE exhaust gas such as a distributed power supply device. In these figures, the exhaust gas discharged from the
However, the combustion of PM in the DPF is indicated by a function of the amount of accumulated PM, the concentration of NO 2 and the temperature, and the PM remains in the DPF even when switching to the bypass line when stopped. Also, when idling operation is performed on the line for extracting deposits, the exhaust gas temperature decreases rapidly, so if the exhaust gas temperature during operation is 400 ° C or less, the unburned fuel remaining inside the filter is oxidized and decomposed. Insufficient time is available, and the system is shut down with unburned soot and ash inside the DPF. As a result, when the device is stopped for a long time, soot and ash with high water absorption adhere to the filter surface, and inorganic components dissolve and precipitate in the pores of DPF and catalyst, increasing pressure loss and catalytic activity. There was a problem of causing a drop in In addition, processing high-concentration PM immediately after restarting causes troubles such as cell blockage, which causes a rapid increase in pressure loss.
An object of the present invention is to prevent the DPF and catalyst from deteriorating due to moisture absorption during long-term shutdown of the DE apparatus, so that no unburned matter or ash remains in the DPF even when operated at an exhaust gas temperature of 400 ° C. or lower. It is an object to provide an exhaust gas purification method capable of stopping the apparatus, that is, a DPF operation method.
上記課題を解決するため、本発明者らは、DE装置の長期間の停止によるDPF及び触媒の劣化の機構について詳細に検討した結果、次にような結論に至った。即ち、排ガス温度が400℃以上の高温で運転したDPFは、長期停止してもDPF及び触媒の劣化は小さいが、400℃以下の運転後に長期停止した場合のDPF及び触媒の劣化は大きく、これは400℃以下の低温での運転を経て停止した場合、DPF内部に未燃の煤や灰が残存し、停止中に吸湿することにより劣化が進行するためであることが分った。そこで、400℃以下の運転条件からの装置の停止操作について鋭意検討したところ、停止時にDPF内部に未燃分である堆積物を残存させないように、抜き出しラインから除去するか、または堆積物が吸湿して付着しないように一旦昇温してから停止することにより、上記課題が解決できることを見出し、本発明に到達した。 In order to solve the above problems, the present inventors have studied in detail the mechanism of DPF and catalyst deterioration due to long-term shutdown of the DE apparatus, and have reached the following conclusions. In other words, the DPF operated at a high temperature of 400 ° C or higher has little deterioration of the DPF and the catalyst even if it is stopped for a long time, but the DPF and catalyst are greatly deteriorated when it is stopped for a long time after the operation at 400 ° C or less. It was found that when stopped after operation at a low temperature of 400 ° C. or less, unburned soot and ash remained inside the DPF, and the deterioration progressed due to moisture absorption during the stop. Therefore, when intensive investigations were made on the operation of stopping the equipment under operating conditions of 400 ° C or lower, it was removed from the extraction line so that unburned deposits would not remain inside the DPF during shutdown, or the deposits absorb moisture. Thus, the inventors have found that the above problem can be solved by raising the temperature once so as not to adhere and then stopping, and have reached the present invention.
すなわち、本願で特許請求される発明は下記のとおりである。
（１）一対の多孔質波板と多孔質平板を基本単位とし、これが交互に交差するように積層された成形体に一酸化窒素を酸化する触媒を担持したディーゼルパティキュレートフィルタ（DPF）、該DPF前流に配置された排ガスの温度検出器及びDPFのフィルタ操作の流路とDPF内部の堆積物を抜出す流路とを切替える流路切替手段から構成されるディーゼルエンジン排ガス中の粒子状物質(PM)除去装置を用い、DEの停止信号入力時に、前記温度検出器で検出されたDPF入口温度が400℃以下となった場合、前記流路切替手段によりDPF内部の堆積物を抜出す流路に切替え、該堆積物が実質的に除去されるように5分以上の定常運転を行った後、前記装置を停止することを特徴とする粒子状物質含有排ガスの浄化方法。
（２）一対の多孔質波板と多孔質平板を基本単位とし、これが交互に交差するように積層された成形体に一酸化窒素を酸化する触媒を担持したディーゼルパティキュレートフィルタ（DPF）、該DPF前流に配置された排ガスの温度検出器及びDPFのフィルタ操作の流路とDPF内部の堆積物を抜出す流路とを切替える流路切替手段から構成されるディーゼルエンジン排ガス中の粒子状物質(PM)除去装置を用い、DEの停止信号入力時に、温度検出器で検出されたDPF入口温度が400℃以下となった場合、該DPF内部の堆積物が吸湿して付着しないようにDPF入口温度を400℃以上に昇温し、前記流路切替手段によりDPF内部の堆積物を抜出す流路に切替えた後、装置を停止することを特徴とする粒子状物質含有排ガスの浄化方法。
（３）ハニカムの隣り合うセルのどちらか一方が交互に目封じされた構造物に一酸化窒素酸化触媒を担持するか、またはその前流に同触媒を設置したDPF、該DPF前流に配置された排ガスの温度検出器、該DPFのバイパスライン、及び該DPFのバイパスラインに流路を切替える流路切替手段から構成されるディーゼルエンジン（DE）排ガス中の粒子状物質除去装置を用い、DEの停止信号入力時に前記温度検出器で検出されたDPF入口温度が400℃以下となった場合、該DPF内部の堆積物が吸湿して付着しないようにDPF入口温度を400℃以上に昇温した後、前記流路切替手段により前記DPFのバイパス流路に切替え、装置を停止することを特徴とする粒子状物質含有排ガスの浄化方法。
That is, the invention claimed in the present application is as follows.
(1) A diesel particulate filter (DPF) having a pair of porous corrugated plates and porous flat plates as basic units, and a catalyst that oxidizes nitric oxide supported on a molded body laminated so as to alternately intersect, Particulate matter in diesel engine exhaust gas composed of exhaust gas temperature detector and DPF filter operation flow channel and DPF filter flow channel switching means for switching deposits inside DPF (PM) When a DE stop signal is input using a (PM) removal device, if the DPF inlet temperature detected by the temperature detector is 400 ° C. or less, the flow switching means extracts the deposits inside the DPF. A method for purifying particulate matter-containing exhaust gas, wherein the apparatus is stopped after switching to a road and performing a steady operation for 5 minutes or more so that the deposit is substantially removed.
(2) Diesel particulate filter (DPF) comprising a pair of porous corrugated plates and porous flat plates as basic units, and a catalyst that oxidizes nitric oxide on a molded body that is laminated so that these cross alternately. Particulate matter in diesel engine exhaust gas composed of exhaust gas temperature detector and DPF filter operation flow channel and DPF filter flow channel switching means for switching deposits inside DPF (PM) When a DPF stop signal is input using the (PM) removal device, if the DPF inlet temperature detected by the temperature detector is 400 ° C or lower, the DPF inlet will prevent the deposit inside the DPF from absorbing moisture and adhering. A method for purifying exhaust gas containing particulate matter, wherein the apparatus is stopped after the temperature is raised to 400 ° C. or higher and the flow path switching means is switched to a flow path for extracting deposits in the DPF.
(3) A nitric oxide oxidation catalyst is supported on a structure in which either one of adjacent cells of the honeycomb is alternately sealed, or a DPF in which the catalyst is installed in the upstream, and disposed in the upstream of the DPF Using a particulate matter removing device in exhaust gas from a diesel engine (DE) exhaust gas comprising a temperature detector for the exhaust gas, a DPF bypass line, and a flow path switching means for switching the flow path to the DPF bypass line, When the DPF inlet temperature detected by the temperature detector when the stop signal is input is 400 ° C. or lower, the DPF inlet temperature is raised to 400 ° C. or higher so that the deposit inside the DPF absorbs moisture and does not adhere. Then, the particulate matter-containing exhaust gas purifying method is characterized by switching to the DPF bypass passage by the passage switching means and stopping the apparatus.
本発明によれば、DE排ガス温度が400℃以下の条件においても、DPF内部に未燃分や灰分を残存させずに装置を停止することができ、装置が長期間停止された場合においても吸湿によるDPF及び触媒の劣化を防止できる。 According to the present invention, even when the DE exhaust gas temperature is 400 ° C. or less, the apparatus can be stopped without leaving unburned or ash content in the DPF, and even when the apparatus is stopped for a long period of time, moisture absorption is possible. Can prevent deterioration of DPF and catalyst.
本発明の原理を図により説明する。図３は、一酸化窒素を酸化する触媒を担持したDPFにおける、NO2による排ガス中の煤燃焼の温度特性を示すが、燃焼速度は300℃前後で大きく上昇していることが分かる。また、図４は、所定の運転温度（排ガス温度）と、アイドリング状態に負荷を低下した際、DPF入口での排ガス温度が300℃まで低下するのに要する時間との関係を示すが、運転温度と所要時間はほぼ比例関係にあることが分かる。この結果、装置のアイドリング運転における酸化可能な煤の量は、運転温度の上昇に伴い、大幅に増加することが明らかである。 The principle of the present invention will be described with reference to the drawings. FIG. 3 shows the temperature characteristics of soot combustion in exhaust gas by NO 2 in a DPF carrying a catalyst that oxidizes nitric oxide, and it can be seen that the combustion rate is greatly increased around 300 ° C. FIG. 4 shows the relationship between the predetermined operating temperature (exhaust gas temperature) and the time required for the exhaust gas temperature at the DPF inlet to drop to 300 ° C. when the load is lowered to the idling state. It can be seen that the required time is almost proportional. As a result, it is clear that the amount of oxidizable soot in the idling operation of the apparatus greatly increases as the operating temperature increases.
一方、NO2によるPMの酸化分解を行う連続再生式のDPFの特徴として、所定の温度における煤の燃焼速度は、ガス中のNO2濃度とDPFに堆積しているPM量との積に比例の関係にあるため、NO2生成量の少ない低温運転ほどDPF内部に堆積しているPM量は多い。このため、400℃以下の低温運転から装置を停止する場合は、PM処理を行わない条件で、一定時間DPF内部に付着した未燃分を酸化分解することが有効である。そのため、DE停止信号が入力時に、DPF入口における排ガス温度が400℃以下であった場合、堆積物を抜出す条件で5分以上運転を継続することにより、DPF内部の煤や灰分を抜出すと共に、フィルタ内部などに残存する未燃分を酸化分解することができ、装置停止後のDPF内部への未燃分の残存を防止できる。さらに、運転時のPM堆積量が少なく、停止時の300℃以上の保持時間が長い400℃以上に昇温してから停止する操作によっても、同様の効果が得られる。その結果、装置の長期停止においても吸湿によるDPF及び触媒の劣化を防止でき、耐久性に優れた運用が可能となる。 On the other hand, as a feature of the continuous regeneration type DPF that oxidizes and decomposes PM with NO 2 , the soot burning rate at a given temperature is proportional to the product of the NO 2 concentration in the gas and the amount of PM accumulated in the DPF Therefore, the amount of PM deposited in the DPF increases as the temperature of the NO 2 generation decreases. For this reason, when the apparatus is stopped from a low temperature operation of 400 ° C. or lower, it is effective to oxidize and decompose the unburned portion adhering to the inside of the DPF for a certain time under the condition that the PM treatment is not performed. Therefore, when the DE stop signal is input and the exhaust gas temperature at the DPF inlet is 400 ° C or lower, the operation is continued for 5 minutes or more under conditions to extract the deposits, and soot and ash content inside the DPF is extracted. In addition, the unburned portion remaining in the filter or the like can be oxidized and decomposed, and the unburned portion remaining in the DPF after the apparatus is stopped can be prevented. Further, the same effect can be obtained by an operation of stopping the temperature after raising the temperature to 400 ° C. or higher, where the PM accumulation amount during operation is small and the holding time of 300 ° C. or longer at the time of stopping is long. As a result, even when the apparatus is stopped for a long time, the deterioration of the DPF and the catalyst due to moisture absorption can be prevented, and the operation with excellent durability is possible.
本発明において、温度検出器はDPF前流に配置されるが、DPF入口における排ガス温度を推定できれば、DE出口に設置し、それに応じた設定温度を変更しても構わない。また、上記400℃以上への昇温は、負荷変動、過熱器(バーナーや電気ヒータなど)、さらには可燃物添加などの公知の技術を用いて行なうことができる。 In the present invention, the temperature detector is disposed upstream of the DPF. However, as long as the exhaust gas temperature at the DPF inlet can be estimated, the temperature detector may be installed at the DE outlet and the set temperature may be changed accordingly. The temperature rise to 400 ° C. or higher can be performed using a known technique such as load fluctuation, superheater (burner, electric heater, etc.), and addition of combustible substances.
以下、実施例を用いて本発明を詳細に説明する。
［実施例１］
25kW-DEを用い、図１に示す系統の排ガス浄化装置のフィルタライン４により、DPF入口温度340℃での定常運転を行った。運転後、流路切替手段３により流路をDPF内部の堆積物抜出しラインに切替え30分間保持した。その後、アイドリング運転を5分間行ってDEを停止した。
［比較例１］
実施例１における流路切替え後に直ぐアイドリング運転を30分間行ってDEを停止した。
［実施例２］
実施例１のDPF入口温度を380℃、保持時間を５分に変更した以外は同様の操作によりDEを停止した。
［比較例２］
比較例２におけるアイドリング時間を10分に変更した以外は同様の操作によりDEを停止した。
Hereinafter, the present invention will be described in detail using examples.
[Example 1]
Using 25 kW-DE, steady operation was performed at a DPF inlet temperature of 340 ° C. by the filter line 4 of the exhaust gas purification system of the system shown in FIG. After operation, the flow path switching means 3 switched the flow path to the deposit extraction line inside the DPF and held it for 30 minutes. After that, idling operation was performed for 5 minutes to stop DE.
[Comparative Example 1]
The idling operation was performed for 30 minutes immediately after the flow path switching in Example 1 to stop DE.
[Example 2]
The DE was stopped by the same operation except that the DPF inlet temperature in Example 1 was changed to 380 ° C. and the holding time was changed to 5 minutes.
[Comparative Example 2]
The DE was stopped by the same operation except that the idling time in Comparative Example 2 was changed to 10 minutes.
［比較例３］
比較例におけるDPF入口温度を400℃に変更した以外は同様の操作によりDEを停止した。
［実施例３］
25kW-DEを用い、図２に示す系統の排ガス浄化装置のフィルタライン４により340℃で定常運転後、DPF入口温度が400℃となるよう負荷を上げて差圧が安定した後、流路切替手段３によりバイパスライン５に流路を切替え、5分間のアイドリング運転後にDEを停止した。
［比較例４］
25kW-DEを用い、図２に示す系統の排ガス浄化装置のフィルタライン４により340℃で定常運転後、流路切替手段３によりバイパスライン５に流路を切替え、5分間のアイドリング運転後にDEを停止した。
[Comparative Example 3]
The DE was stopped by the same operation except that the DPF inlet temperature in the comparative example was changed to 400 ° C.
[Example 3]
After 25 kW-DE, steady operation at 340 ° C by filter line 4 of the exhaust gas purification system of the system shown in Fig. 2, the load is increased so that the DPF inlet temperature becomes 400 ° C, and the differential pressure is stabilized, then the flow path is switched The flow path was switched to the bypass line 5 by
[Comparative Example 4]
Using 25 kW-DE, after the steady operation at 340 ° C. by the filter line 4 of the exhaust gas purification system of the system shown in FIG. 2, the flow path switching means 3 switches the flow path to the bypass line 5, and after the idling operation for 5 minutes, the DE is Stopped.
実施例１〜３及び比較例１〜４における試験後のDPFの質量を測定し、DPF内部に残存しているPM量を比較した結果を表１に示す。実施例１〜３と比較例１、２、４との比較により、停止信号入力後に一定時間の煤の燃焼運転を行うか、又は400℃以上までの昇温運転を行うことで、DE停止後にDPF内部に残存する未燃分を低減できることが分った。更に実施例１、２と比較例３の比較から400℃以下での低温運転時に有効な操作であることが分った。 Table 1 shows the results of measuring the mass of DPF after the tests in Examples 1 to 3 and Comparative Examples 1 to 4, and comparing the amount of PM remaining inside the DPF. By comparing Examples 1 to 3 with Comparative Examples 1, 2, and 4, by performing a soot combustion operation for a certain time after a stop signal is input, or by performing a temperature rising operation up to 400 ° C. or higher, after DE stop It has been found that unburned fuel remaining in the DPF can be reduced. Further, it was found from the comparison between Examples 1 and 2 and Comparative Example 3 that the operation was effective during low temperature operation at 400 ° C. or lower.
１：DPF、２：温度検出器、３：流路切替手段、4：フィルタライン、５：バイパスライン、６：DPF内部の堆積物抜出しライン、７：ディーゼルエンジン
1: DPF, 2: temperature detector, 3: flow path switching means, 4: filter line, 5: bypass line, 6: deposit extraction line inside DPF, 7: diesel engine
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013119771A (en) * | 2011-12-06 | 2013-06-17 | Toyota Motor Corp | Exhaust emission control device of internal combustion engine |
| KR101619665B1 (en) | 2014-12-11 | 2016-05-10 | 현대자동차주식회사 | An apparatus of preventing dpf failure of commercial engine and a control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013119771A (en) * | 2011-12-06 | 2013-06-17 | Toyota Motor Corp | Exhaust emission control device of internal combustion engine |
| KR101619665B1 (en) | 2014-12-11 | 2016-05-10 | 현대자동차주식회사 | An apparatus of preventing dpf failure of commercial engine and a control method thereof |
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