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JP2019094878A - Post-treatment control device and post-treatment control method - Google Patents

Post-treatment control device and post-treatment control method Download PDF

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JP2019094878A
JP2019094878A JP2017227004A JP2017227004A JP2019094878A JP 2019094878 A JP2019094878 A JP 2019094878A JP 2017227004 A JP2017227004 A JP 2017227004A JP 2017227004 A JP2017227004 A JP 2017227004A JP 2019094878 A JP2019094878 A JP 2019094878A
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electric heater
injection
scr
post
sulfur purge
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JP6972967B2 (en
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美由紀 日▲高▼
Miyuki Hidaka
美由紀 日▲高▼
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Isuzu Motors Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

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Abstract

To suppress the thermal deterioration of an SCR.SOLUTION: A post-treatment control device 100 for controlling a post-treatment device in which an SCR is arranged in an exhaust passage in which an exhaust gas from an internal combustion engine of a vehicle flows comprises: a heating control part 110 for performing control so as to heat an electric heater arranged at an upstream side of the SCR; an injection control part 120 for performing control so as to start the injection of urea water to the electric heater after a temperature of the electric heater reaches a temperature at which urea is hydrolyzed to ammonia or higher; and a sulfur purge control part 130 for performing control so as to start a sulfur purge after the injection of urea water is started. The heating control part 110 and the injection control part 120 respectively perform control so as to heat the electric heater, and to inject the urea water for a prescribed time after the sulfur purge is started.SELECTED DRAWING: Figure 1

Description

本開示は、内燃機関から排出される排ガスの後処理を制御する後処理制御装置および後処理制御方法に関する。   The present disclosure relates to an aftertreatment control device and an aftertreatment control method for controlling the aftertreatment of exhaust gas discharged from an internal combustion engine.

従来、車両の内燃機関から排出される排ガス中のNOxを低減する触媒であるSCR(Selective Catalytic Reduction)を備えた後処理装置において、排ガスを高温かつリッチ状態に制御し、SCRに蓄積された硫黄酸化物(SOx)を除去する硫黄除去処理(以下、硫黄パージという)を実行することにより、NOx浄化性能を回復させることが知られている(例えば、特許文献1参照)。   Conventionally, in an aftertreatment device equipped with an SCR (Selective Catalytic Reduction), which is a catalyst for reducing NOx in exhaust gas emitted from an internal combustion engine of a vehicle, the exhaust gas is controlled to a high temperature and rich state, and sulfur accumulated in the SCR It is known to recover NOx purification performance by executing a sulfur removal process (hereinafter referred to as a sulfur purge) for removing oxides (SOx) (see, for example, Patent Document 1).

特開2017−110513号公報JP, 2017-110513, A

しかしながら、硫黄パージの実行により排ガスが高温になると、SCRが熱劣化するおそれがある。   However, if the exhaust gas becomes high temperature due to the execution of the sulfur purge, the SCR may be thermally deteriorated.

本開示の目的は、SCRの熱劣化を抑制できる後処理制御装置および後処理制御方法を提供することである。   An object of the present disclosure is to provide an aftertreatment control device and a aftertreatment control method capable of suppressing the thermal deterioration of the SCR.

本開示の態様の後処理制御装置は、車両の内燃機関から排出された排ガスが流れる排気通路にSCR(Selective Catalytic Reduction)が設けられた後処理装置を制御する後処理制御装置であって、前記SCRの上流側に設けられた電熱体を加熱するように制御する加熱制御部と、前記電熱体の温度が、尿素がアンモニアに加水分解する温度以上になった後、前記電熱体に対して尿素水の噴射を開始するように制御する噴射制御部と、前記尿素水の噴射が開始された後、硫黄パージを開始するように制御する硫黄パージ制御部と、を有し、前記加熱制御部および前記噴射制御部は、それぞれ、前記硫黄パージが開始された後の所定時間の間、前記電熱体の加熱および前記尿素水の噴射を実行するように制御する。   An aftertreatment control device according to an aspect of the present disclosure is an aftertreatment control device that controls an aftertreatment device in which an SCR (Selective Catalytic Reduction) is provided in an exhaust passage through which exhaust gas discharged from an internal combustion engine of a vehicle flows. A heating control unit configured to control an electric heater provided on the upstream side of the SCR, and a temperature of the electric heater, the temperature of the electric heater being equal to or higher than a temperature at which urea hydrolyses to ammonia; The heating control unit includes: an injection control unit that controls to start water injection; and a sulfur purge control unit that controls to start a sulfur purge after the injection of the urea water is started. The injection control unit controls the heating of the electric heater and the injection of the aqueous urea solution for a predetermined time after the start of the sulfur purge.

本開示の態様の後処理制御方法は、車両の内燃機関から排出された排ガスが流れる排気通路にSCR(Selective Catalytic Reduction)が設けられた後処理装置を制御する後処理制御方法であって、前記SCRの上流側に設けられた電熱体を加熱し、前記電熱体の温度が、尿素がアンモニアに加水分解する温度以上になった後、前記電熱体に対して尿素水の噴射を開始し、前記尿素水の噴射が開始された後、硫黄パージを開始し、前記硫黄パージが開始された後の所定時間の間、前記電熱体の加熱および前記尿素水の噴射を実行する。   An aftertreatment control method according to an aspect of the present disclosure is an aftertreatment control method for controlling an aftertreatment device in which an SCR (Selective Catalytic Reduction) is provided in an exhaust passage through which an exhaust gas discharged from an internal combustion engine of a vehicle flows. The electric heater provided on the upstream side of the SCR is heated, and after the temperature of the electric heater becomes equal to or higher than the temperature at which urea hydrolyses to ammonia, injection of urea water to the electric heater is started, After injection of urea water is started, sulfur purge is started, and heating of the electric heater and injection of urea water are performed for a predetermined time after the sulfur purge is started.

本開示によれば、SCRの熱劣化を抑制することができる。   According to the present disclosure, thermal deterioration of the SCR can be suppressed.

本発明の実施の形態に係る後処理装置の構成の一例を示す模式図A schematic view showing an example of the configuration of a post-processing apparatus according to an embodiment of the present invention 本発明の実施の形態に係る後処理制御装置の構成の一例を示すブロック図Block diagram showing an example of the configuration of the post-processing control device according to the embodiment of the present invention 本発明の実施の形態に係る後処理制御装置の動作の一例を示すフローチャートA flowchart showing an example of the operation of the post-processing control device according to the embodiment of the present invention

以下、本発明の実施の形態について、図面を参照して詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

まず、本実施の形態に係る後処理装置10について、図1を用いて説明する。図1は、後処理装置10の構成の一例を示す模式図である。   First, a post-processing apparatus 10 according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic view showing an example of the configuration of the post-processing apparatus 10.

図1に示す後処理装置10は、車両に搭載され、内燃機関(図示略)から排出される排ガスを浄化する装置である。内燃機関は、例えば、ディーゼルエンジンまたはガソリンエンジンである。   The post-processing device 10 illustrated in FIG. 1 is a device mounted on a vehicle and purifying exhaust gas discharged from an internal combustion engine (not shown). The internal combustion engine is, for example, a diesel engine or a gasoline engine.

排気通路(排気管ともいう)1の上流側(図中の左側)は、内燃機関に接続された排気マニホールド(図示略)の下流側に接続されている。よって、排気マニホールドから排出された排ガスは、排気通路1を、図中の左側から右側へ流れる(図中の矢印参照)。   An upstream side (left side in the drawing) of the exhaust passage (also referred to as an exhaust pipe) 1 is connected to the downstream side of an exhaust manifold (not shown) connected to the internal combustion engine. Therefore, the exhaust gas discharged from the exhaust manifold flows through the exhaust passage 1 from the left side to the right side in the drawing (see the arrow in the drawing).

排気通路1には、その上流側から順に、尿素水噴射装置2、電熱体3、SCR(尿素SCR触媒)4、ASC(Ammonia Slip Catalyst)5が設けられている。   In the exhaust passage 1, a urea water injection device 2, an electric heater 3, an SCR (urea SCR catalyst) 4 and an ASC (Ammonia Slip Catalyst) 5 are provided in this order from the upstream side.

尿素水噴射装置2は、排気通路1内に設けられた電熱体3に直接当たるように尿素水を噴射する。尿素水噴射装置2の尿素水噴射処理は、後述する後処理制御装置100によって制御される(詳細は後述)。   The urea water injection device 2 injects urea water so as to directly contact the electric heater 3 provided in the exhaust passage 1. The urea water injection processing of the urea water injection device 2 is controlled by the after-treatment control device 100 described later (details will be described later).

電熱体3は、例えば、板状に形成されており、排気通路1の内壁から排ガスの流れ方向(図中の矢印参照)に垂直な方向に沿って突出するように設けられている。   The electric heater 3 is formed, for example, in a plate shape, and is provided so as to protrude from the inner wall of the exhaust passage 1 along a direction perpendicular to the flow direction of the exhaust gas (see the arrow in the drawing).

また、電熱体3は、例えば車載バッテリ(図示略)と電気的に接続されており、その車載バッテリから電力の供給を受けて加熱される。電熱体3の加熱処理は、後述する後処理制御装置100によって制御される(詳細は後述)。   Further, the electric heater 3 is electrically connected to, for example, an on-board battery (not shown), and is supplied with electric power from the on-board battery to be heated. The heat treatment of the electric heater 3 is controlled by the after-treatment control device 100 described later (details will be described later).

SCR4は、排ガス中のNOxを低減する選択還元型触媒である。SCR4には、噴射された尿素水から発生したアンモニアが供給される。これにより、SCR4において、排ガス中のNOxは窒素に還元される。   The SCR 4 is a selective reduction catalyst that reduces NOx in the exhaust gas. The SCR 4 is supplied with ammonia generated from the injected urea water. Thereby, NOx in the exhaust gas is reduced to nitrogen in the SCR 4.

SCR4は、例えば、銅(Cu)が活性主成分の触媒であればよく、銅のみで構成されてもよいし、銅以外が含まれてもよい。   The SCR 4 may be, for example, a catalyst of copper (Cu) as an active main component, and may be made of only copper or may contain other than copper.

ASC5は、SCR4で消費しきれなかったアンモニアを酸化、分解する。これにより、アンモニアが大気中に排出されることを防止できる。   ASC5 oxidizes and decomposes ammonia that can not be consumed by SCR4. This can prevent ammonia from being discharged into the atmosphere.

SCR4およびASC5を通過した排ガスは、排出口(図示略)から車外へ排出される。   The exhaust gas having passed through the SCR 4 and the ASC 5 is discharged out of the vehicle through an exhaust port (not shown).

なお、排気通路1には、尿素水噴射装置2よりも上流側に、排ガス中の一酸化窒素や炭化水素を酸化させて二酸化窒素と水を生成する酸化触媒(例えば、DOC:Diesel Oxidation Catalyst)や、排ガス中のPM(粒子状物質)を捕集して取り除く微粒子捕集フィルタ(例えば、DPF:Diesel Particulate Filter)が設けられてもよい。   An oxidation catalyst (for example, DOC: Diesel Oxidation Catalyst) that oxidizes nitrogen monoxide and hydrocarbons in the exhaust gas to generate nitrogen dioxide and water on the upstream side of the urea aqueous solution injection device 2 in the exhaust passage 1 Alternatively, a particulate collection filter (for example, DPF: Diesel Particulate Filter) may be provided to collect and remove PM (particulate matter) in the exhaust gas.

以上、後処理装置10の構成について説明した。   The configuration of the post-processing device 10 has been described above.

次に、本実施の形態に係る後処理制御装置100の構成について、図2を用いて説明する。   Next, the configuration of the post-processing control device 100 according to the present embodiment will be described using FIG.

後処理制御装置100は、例えば、CPU(Central Processing Unit)、制御プログラムを格納したROM(Read Only Memory)等の記憶媒体、RAM(Random Access Memory)等の作業用メモリ、および通信回路などを有する。以下に説明する図2の各部の機能は、CPUが制御プログラムを実行することにより実現される。   The post-processing control device 100 includes, for example, a central processing unit (CPU), a storage medium such as a read only memory (ROM) storing a control program, a working memory such as a random access memory (RAM), and a communication circuit. . The functions of the units in FIG. 2 described below are realized by the CPU executing a control program.

後処理制御装置100は、上述した後処理装置10を制御する装置であり、図2に示すように、加熱制御部110、噴射制御部120、および硫黄パージ制御部130を有する。   The post-processing control device 100 is a device that controls the above-described post-processing device 10, and includes a heating control unit 110, an injection control unit 120, and a sulfur purge control unit 130, as shown in FIG.

加熱制御部110は、硫黄パージが実行されていないとき(後述する硫黄パージ不実行時間)に、車載バッテリから電熱体3へ電力が供給されるように制御する(例えば、車載バッテリと電熱体3との間に設けられたスイッチをオンに制御する)ことで、電熱体3の加熱を開始させる。   The heating control unit 110 controls so that the electric power is supplied from the in-vehicle battery to the electric heater 3 when the sulfur purge is not performed (the sulfur purge non-execution time described later) (for example, the in-vehicle battery and the electric heater 3) Control the switch provided between them to turn on the heating of the electric heater 3.

また、加熱制御部110は、尿素水の噴射が終了したときに、車載バッテリから電熱体3へ電力が供給されないように制御する(例えば、車載バッテリと電熱体3との間に設けられたスイッチをオフに制御する)ことで、電熱体3の加熱を終了させる。   Further, the heating control unit 110 controls so that the electric power is not supplied from the in-vehicle battery to the electric heater 3 when the injection of urea water is finished (for example, a switch provided between the in-vehicle battery and the electric heater 3) Is turned off to end the heating of the electric heater 3.

噴射制御部120は、電熱体3の加熱が開始されてから予め設定された時間(以下、第1設定時間という)が経過したときに、尿素水の噴射を開始するように尿素水噴射装置2を制御する。   The injection control unit 120 starts the injection of urea water when a preset time (hereinafter, referred to as a first set time) elapses after heating of the electric heater 3 is started. Control.

第1設定時間は、電熱体3の温度が、尿素水が効率良くアンモニアに加水分解する温度(例えば、130度)以上になるまでに要する時間である。この第1設定時間は、予め実施された実験やシミュレーション等の結果に基づいて設定される。   The first set time is a time required for the temperature of the electric heater 3 to reach a temperature (e.g., 130 degrees) at which the urea water efficiently hydrolyzes to ammonia. The first set time is set based on the results of experiments and simulations performed in advance.

なお、第1設定時間は、排気通路1内の温度に応じて、複数設定されていてもよい。その場合、噴射制御部120は、複数の第1設定時間の中から、排気通路1内の温度を検出可能なセンサ(図示略)で検出された温度に対応する第1設定時間を選択して用いてもよい。   Note that a plurality of first set times may be set in accordance with the temperature in the exhaust passage 1. In that case, the injection control unit 120 selects a first set time corresponding to the temperature detected by a sensor (not shown) capable of detecting the temperature in the exhaust passage 1 from among the plurality of first set times. You may use.

また、噴射制御部120は、噴射された尿素水の量が予め設定された量に達したときに、尿素水の噴射を終了するように尿素水噴射装置2を制御する。   In addition, the injection control unit 120 controls the urea water injection device 2 so as to end the injection of urea water when the amount of injected urea water reaches a preset amount.

硫黄パージ制御部130は、尿素水の噴射が開始されてから予め設定された時間(以下、第2設定時間という)が経過したときに、硫黄パージを開始するように燃料噴射装置(図示略)を制御する。硫黄パージは、例えば、内燃機関のポスト噴射またはアフター噴射で、SCR4に流入する排ガスを高温かつリッチ状態に制御することにより実現される。   The sulfur purge control unit 130 is a fuel injection device (not shown) so as to start sulfur purge when a preset time (hereinafter referred to as a second set time) has elapsed since injection of urea aqueous solution was started. Control. The sulfur purge is realized, for example, by controlling the exhaust gas flowing into the SCR 4 to a high temperature and rich state by post injection or after injection of the internal combustion engine.

第2設定時間は、活性主成分であるCuの被毒状態を回復させる量のアンモニアの発生に要する時間である。この第2設定時間は、予め実施された実験やシミュレーション等の結果に基づいて設定される。   The second set time is the time required to generate an amount of ammonia that restores the poisoning state of Cu, which is the active main component. The second set time is set based on the results of experiments and simulations performed in advance.

また、硫黄パージ制御部130は、硫黄パージの開始から予め設定された時間(以下、硫黄パージ実行時間という)が経過したときに、硫黄パージを終了するように燃料噴射装置を制御する。   In addition, the sulfur purge control unit 130 controls the fuel injection device to end the sulfur purge when a preset time (hereinafter referred to as a sulfur purge execution time) has elapsed from the start of the sulfur purge.

硫黄パージ実行時間は、予め設定されている。また、硫黄パージが終了してから次の硫黄パージが開始されるまでの時間(以下、硫黄パージ不実行時間という)も、予め設定されている。硫黄パージ不実行時間は、硫黄パージ実行時間よりも長い。また、硫黄パージ実行時間は、尿素水の噴射が実行される時間よりも長い。   The sulfur purge execution time is preset. Further, the time from the end of the sulfur purge to the start of the next sulfur purge (hereinafter referred to as the sulfur purge non-execution time) is also preset. The sulfur purge non-execution time is longer than the sulfur purge execution time. In addition, the sulfur purge execution time is longer than the time when injection of urea aqueous solution is performed.

以上、後処理制御装置100の構成について説明した。   The configuration of the post-processing control device 100 has been described above.

次に、本実施の形態に係る後処理制御装置100の動作について、図3を用いて説明する。図3のフローのスタート時は、例えば、内燃機関の始動時である。また、図3のフローは、車両の走行中、繰り返し行われる。   Next, the operation of the post-processing control device 100 according to the present embodiment will be described with reference to FIG. The start of the flow of FIG. 3 is, for example, the start of the internal combustion engine. Further, the flow of FIG. 3 is repeated while the vehicle is traveling.

まず、加熱制御部110は、硫黄パージ不実行時間中に、電熱体3の加熱を開始させる(ステップS101)。   First, the heating control unit 110 starts heating the electric heater 3 during the sulfur purge non-execution time (step S101).

次に、噴射制御部120は、電熱体3の加熱開始から第1設定時間が経過したら、尿素水噴射装置2に尿素水の噴射を開始させる(ステップS102)。   Next, the injection control unit 120 causes the urea water injection device 2 to start injection of urea water when the first set time has elapsed from the start of heating of the electric heater 3 (step S102).

これにより、電熱体3へ噴射された尿素水からアンモニアが発生し、そのアンモニアは、排ガスに混じってSCR4に供給される。   As a result, ammonia is generated from the urea water injected to the electric heater 3, and the ammonia is mixed with the exhaust gas and supplied to the SCR 4.

次に、硫黄パージ制御部130は、尿素水の噴射開始から第2設定時間が経過したら、硫黄パージを開始するように燃料噴射装置を制御する(ステップS103)。硫黄パージが開始された後も、電熱体3の加熱および尿素水の噴射は、引き続き実行される。   Next, the sulfur purge control unit 130 controls the fuel injection device to start the sulfur purge when the second set time has elapsed from the start of injection of urea water (step S103). Even after the sulfur purge is started, the heating of the electric heater 3 and the injection of the urea water continue to be performed.

次に、噴射制御部120は、噴射された尿素水の量が予め設定された量に達したときに、尿素水の噴射を終了するように尿素水噴射装置2を制御し、加熱制御部110は、電熱体3の加熱を終了させる(ステップS104)。   Next, the injection control unit 120 controls the urea water injection device 2 to end the injection of urea water when the amount of injected urea water reaches a preset amount, and the heating control unit 110 Ends the heating of the electric heater 3 (step S104).

次に、硫黄パージ制御部130は、硫黄パージの開始から硫黄パージ実行時間が経過したら、硫黄パージを終了するように燃料噴射装置を制御する(ステップS105)。   Next, the sulfur purge control unit 130 controls the fuel injection device to end the sulfur purge when the sulfur purge execution time has elapsed from the start of the sulfur purge (step S105).

以上、後処理制御装置100の動作について説明した。   The operation of the post-processing control device 100 has been described above.

次に、本実施の形態の後処理制御装置100の作用効果について説明する。   Next, the operation and effect of the post-processing control device 100 of the present embodiment will be described.

本実施の形態によれば、硫黄パージの実行中にSCR4にアンモニアを供給するため、そのアンモニアによって脱硫黄が促進され、SCR4に蓄積された硫黄酸化物(SOx)を効率良く除去することができる。よって、硫黄パージの実行回数を減らすことができ、SCR4の熱劣化を抑制できる。   According to the present embodiment, since ammonia is supplied to the SCR 4 during execution of the sulfur purge, the ammonia promotes desulfurization, and sulfur oxides (SOx) accumulated in the SCR 4 can be efficiently removed. . Therefore, the number of times of execution of the sulfur purge can be reduced, and the thermal deterioration of the SCR 4 can be suppressed.

また、本実施の形態によれば、電熱体3を充分に加熱してからその電熱体3に対して尿素水の噴射を行うため、効率良くアンモニアを発生させることができ、尿素水の無駄を省くことができる。   Further, according to the present embodiment, since the urea water is injected to the electric heater 3 after the electric heater 3 is sufficiently heated, ammonia can be efficiently generated, and waste of the urea water can be reduced. It can be omitted.

また、本実施の形態によれば、硫黄パージの開始前に、電熱体3を加熱し、その電熱体3に対して尿素水の噴射を行うため、脱硫黄を促進するために充分なアンモニアを発生させてから硫黄パージを実行することができる。よって、SCR4に蓄積された硫黄酸化物を効率良く除去できる。   Further, according to the present embodiment, since the electric heater 3 is heated before the start of the sulfur purge and the urea water is injected to the electric heater 3, ammonia sufficient for promoting the desulfurization is used. Once generated, a sulfur purge can be performed. Therefore, the sulfur oxides accumulated in the SCR 4 can be efficiently removed.

また、本実施の形態によれば、硫黄パージの開始前に、電熱体3を加熱し、その電熱体3に対して尿素水の噴射を行うため、排ガスの温度が低い状況(例えば、内燃機関の始動時)であっても、効率良く尿素水からアンモニアを発生させることができる。   Further, according to the present embodiment, the electric heater 3 is heated before the start of the sulfur purge, and the urea water is injected to the electric heater 3 so that the temperature of the exhaust gas is low (for example, internal combustion engine The ammonia water can be efficiently generated from the aqueous urea solution even at the time of start-up).

また、本実施の形態によれば、板状の電熱体3を排気通路1の内壁から排ガスの流れ方向に垂直な方向に沿って突出するように設けたため、排ガスの一部の流れが阻害され、電熱体3の下流側かつSCR4の上流側の排ガスに乱流を発生させることができる。これにより、排ガス中のアンモニアを均一にすることができ、SCR4の上流側端面にアンモニアを満遍なく供給することができる。その結果、効率良く硫黄酸化物を除去できる。   Further, according to the present embodiment, since the plate-like electric heating body 3 is provided so as to protrude from the inner wall of the exhaust passage 1 along the direction perpendicular to the flow direction of the exhaust gas, the flow of part of the exhaust gas is obstructed. A turbulent flow can be generated in the exhaust gas downstream of the electric heater 3 and upstream of the SCR 4. As a result, ammonia in the exhaust gas can be made uniform, and ammonia can be uniformly supplied to the upstream end surface of the SCR 4. As a result, sulfur oxides can be efficiently removed.

以上、後処理制御装置100の作用効果について説明した。   The operation and effects of the post-processing control device 100 have been described above.

なお、本発明は、上述の実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。以下、各変形例について説明する。   The present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present invention. Each modification will be described below.

[変形例1]
実施の形態では、板状の電熱体3を排気通路1の内壁から排ガスの流れ方向に垂直な方向に沿って突出するように設ける場合を例に挙げて説明したが、これに限定されない。電熱体3は、電熱体3の下流側かつSCR4の上流側を流れる排ガスに乱流を発生させることができる角度(排ガスの流れ方向に対する角度)、形状、および長さを備えるものであればよい。
[Modification 1]
In the embodiment, the plate-like electric heater 3 is provided so as to protrude from the inner wall of the exhaust passage 1 along the direction perpendicular to the flow direction of the exhaust gas, but it is not limited thereto. The electric heater 3 may have an angle (an angle with respect to the flow direction of the exhaust gas), a shape, and a length that can generate turbulent flow in the exhaust gas flowing downstream of the electric heater 3 and upstream of the SCR 4 .

[変形例2]
実施の形態では、後処理制御装置100が加熱制御部110、噴射制御部120、および硫黄パージ制御部130を備える場合を例に挙げて説明したが、これに限定されない。例えば、加熱制御部110、噴射制御部120、および硫黄パージ制御部130は、それぞれ、異なる制御装置(例えば、ECU:Electric Control Unit)に備えられてもよい。
[Modification 2]
In the embodiment, although the case where the post-processing control device 100 includes the heating control unit 110, the injection control unit 120, and the sulfur purge control unit 130 has been described as an example, the present invention is not limited thereto. For example, the heating control unit 110, the injection control unit 120, and the sulfur purge control unit 130 may be included in different control devices (for example, ECU: Electric Control Unit).

以上、各変形例について説明した。   In the above, each modification was demonstrated.

本発明は、内燃機関から排出される排ガスの後処理を制御する技術に適用できる。   The present invention is applicable to the technology of controlling the aftertreatment of exhaust gas discharged from an internal combustion engine.

1 排気通路
2 尿素水噴射装置
3 電熱体
4 SCR
5 ASC
10 後処理装置
100 後処理制御装置
110 加熱制御部
120 噴射制御部
130 硫黄パージ制御部
1 exhaust passage 2 urea water injection device 3 electric heater 4 SCR
5 ASC
DESCRIPTION OF SYMBOLS 10 post-processing apparatus 100 post-processing control apparatus 110 heating control part 120 injection control part 130 sulfur purge control part

Claims (5)

車両の内燃機関から排出された排ガスが流れる排気通路にSCR(Selective Catalytic Reduction)が設けられた後処理装置を制御する後処理制御装置であって、
前記SCRの上流側に設けられた電熱体を加熱するように制御する加熱制御部と、
前記電熱体の温度が、尿素がアンモニアに加水分解する温度以上になった後、前記電熱体に対して尿素水の噴射を開始するように制御する噴射制御部と、
前記尿素水の噴射が開始された後、硫黄パージを開始するように制御する硫黄パージ制御部と、を有し、
前記加熱制御部および前記噴射制御部は、それぞれ、
前記硫黄パージが開始された後の所定時間の間、前記電熱体の加熱および前記尿素水の噴射を実行するように制御する、
後処理制御装置。
An aftertreatment control device for controlling an aftertreatment device in which an SCR (Selective Catalytic Reduction) is provided in an exhaust passage through which an exhaust gas discharged from an internal combustion engine of a vehicle flows.
A heating control unit configured to control heating of an electric heater provided on the upstream side of the SCR;
An injection control unit configured to control injection of urea water to the electric heater after the temperature of the electric heater becomes equal to or higher than a temperature at which urea hydrolyzes to ammonia;
And a sulfur purge control unit configured to control to start a sulfur purge after the injection of the urea aqueous solution is started.
The heating control unit and the injection control unit are respectively
The heating of the electric heater and the injection of the urea water are controlled to be performed for a predetermined time after the start of the sulfur purge.
Post-processing control device.
前記硫黄パージ制御部は、
前記尿素水の噴射の開始から、硫黄被毒物が活性化する量のアンモニアの発生に要する時間が経過した後で、前記硫黄パージを開始するように制御する、
請求項1に記載の後処理制御装置。
The sulfur purge control unit
The sulfur purge is controlled to start after the time required to generate an amount of ammonia that activates sulfur poisoning has passed from the start of injection of the aqueous urea solution.
The post-processing control device according to claim 1.
前記電熱体は、
前記電熱体の下流側かつ前記SCRの上流側を流れる前記排ガスに乱流を発生させる角度、形状、および長さを有する、
請求項1または2に記載の後処理制御装置。
The electric heater is
It has an angle, a shape, and a length that generate turbulence in the exhaust gas flowing downstream of the electric heater and upstream of the SCR.
The post-processing control device according to claim 1.
前記SCRは、
活性主成分が銅である、
請求項1から3に記載の後処理制御装置。
The SCR is
The active main ingredient is copper,
The post-processing control device according to any one of claims 1 to 3.
車両の内燃機関から排出された排ガスが流れる排気通路にSCR(Selective Catalytic Reduction)が設けられた後処理装置を制御する後処理制御方法であって、
前記SCRの上流側に設けられた電熱体を加熱し、
前記電熱体の温度が、尿素がアンモニアに加水分解する温度以上になった後、前記電熱体に対して尿素水の噴射を開始し、
前記尿素水の噴射が開始された後、硫黄パージを開始し、
前記硫黄パージが開始された後の所定時間の間、前記電熱体の加熱および前記尿素水の噴射を実行する、
後処理制御方法。
An aftertreatment control method for controlling an aftertreatment device in which an SCR (Selective Catalytic Reduction) is provided in an exhaust passage through which an exhaust gas discharged from an internal combustion engine of a vehicle flows.
Heating an electric heater provided on the upstream side of the SCR;
After the temperature of the electric heater becomes equal to or higher than the temperature at which urea hydrolyzes into ammonia, injection of urea water to the electric heater is started,
After the injection of the aqueous urea solution is started, the sulfur purge is started,
Heating the electric heater and injecting the urea water for a predetermined time after the start of the sulfur purge;
Post-processing control method.
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