WO2011125258A1 - エンジンの排気浄化装置 - Google Patents
エンジンの排気浄化装置 Download PDFInfo
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- WO2011125258A1 WO2011125258A1 PCT/JP2010/071712 JP2010071712W WO2011125258A1 WO 2011125258 A1 WO2011125258 A1 WO 2011125258A1 JP 2010071712 W JP2010071712 W JP 2010071712W WO 2011125258 A1 WO2011125258 A1 WO 2011125258A1
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- urea
- amount
- exhaust
- engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
- F02D41/0245—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus by increasing temperature of the exhaust gas leaving the engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/228—Warning displays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to an exhaust purification device that selectively reduces and purifies nitrogen oxides (NOx) contained in engine exhaust.
- NOx nitrogen oxides
- Patent Document 1 As an exhaust purification system for purifying NOx contained in engine exhaust, an exhaust purification device as described in JP 2009-127472 A (Patent Document 1) has been proposed.
- This exhaust purification device injects an aqueous urea solution according to the engine operating condition upstream of the exhaust of a selective catalytic reduction (SCR) converter disposed in the exhaust pipe of the engine, and generates ammonia by hydrolysis.
- SCR selective catalytic reduction
- urea aqueous solution droplets attached to the exhaust system, for example, when the exhaust temperature becomes higher than the boiling point (about 100 ° C.) of the solvent (water) and lower than the boiling point (about 135 ° C.) of the solute (urea), urea
- water as a solvent evaporates from the aqueous solution, and urea crystals are precipitated in the exhaust system.
- urea crystals are deposited in the exhaust system, the cross-sectional area of the exhaust flow path is reduced, which causes, for example, a reduction in output and fuel consumption due to an increase in exhaust pressure.
- the crystal of the urea aqueous solution is deposited on the SCR converter, the contact area of the exhaust gas in the SCR converter is reduced, so that the NOx purification rate is lowered.
- the present invention estimates the amount of urea crystals deposited in the exhaust system located downstream of the injection point of the aqueous urea solution, for example, forcing the urea crystals to be removed.
- An object of the present invention is to provide an exhaust emission control device for an engine that makes it possible to grasp the execution time and the like.
- the engine exhaust gas purification device is disposed in the exhaust pipe of the engine and uses an ammonia generated from the urea aqueous solution to selectively reduce and purify NOx, and the engine exhaust state upstream of the SCR converter is in an engine operation state.
- a reducing agent injection device that injects an aqueous urea solution at a corresponding flow rate; a temperature sensor that detects an exhaust gas temperature upstream of the reducing agent injection device; and a control unit that includes a computer. Then, the control unit deposits on the exhaust system located downstream from the injection point of the urea aqueous solution based on the temperature of the exhaust detected by the temperature sensor and the flow rate of the aqueous urea solution injected from the reducing agent injection device.
- the amount of urea crystals deposited per unit time is estimated, and the amount of urea crystals detached from the exhaust system per unit time is estimated based on the exhaust temperature detected by the temperature sensor. Based on the amount of precipitation per unit and the amount of separation, the amount of urea crystals deposited in the exhaust system is estimated.
- FIG. 1 shows an example of an exhaust purification device.
- An intake pipe 14 connected to the intake manifold 12 of the diesel engine 10 includes an air cleaner 16 that filters dust and the like in the intake air along a direction of intake air flow, a compressor 18A of a turbocharger 18 that supercharges intake air, and a turbocharger 18.
- An intercooler 20 that cools the intake air that has passed through and becomes hot is arranged in this order.
- the exhaust pipe 24 connected to the exhaust manifold 22 of the diesel engine 10 includes a turbine 18B of the turbocharger 18 and a continuously regenerating diesel particulate filter (DPF) device 26 along the exhaust circulation direction.
- a reducing agent injection device 28 that injects urea aqueous solution, an SCR converter 30 that selectively reduces and purifies NOx using ammonia generated from the urea aqueous solution by hydrolysis, and an oxidation catalytic converter 32 that oxidizes ammonia that has passed through the SCR converter 30 Arranged in this order.
- the continuous regeneration type DPF device 26 includes a diesel oxidation catalyst (DOC) converter 26A that oxidizes at least nitric oxide (NO) into nitrogen dioxide (NO 2 ), and particulate matter (PM) in exhaust gas.
- DOC diesel oxidation catalyst
- DPF26B which collects and removes (Matter).
- CSF Catalyzed Soot Filter
- CSF Catalyzed Soot Filter
- the reducing agent injection device 28 includes a tank for storing the urea aqueous solution, a pump for sucking the urea aqueous solution from the tank and pumping it, a flow rate control valve for controlling the injection flow rate of the urea aqueous solution, an injection nozzle for injecting the urea aqueous solution to the exhaust pipe 24, and the like. Although not shown in detail.
- the diesel engine 10 is provided with an exhaust gas recirculation (EGR) device 34 that reduces NOx by lowering the combustion temperature by introducing a part of the exhaust gas into the intake air and recirculating it.
- the EGR device 34 introduces an exhaust gas flowing through the exhaust pipe 24 into the intake pipe 14, an EGR pipe 34 ⁇ / b> A for cooling the exhaust gas flowing through the EGR pipe 34 ⁇ / b> A, and the intake pipe 14.
- an EGR control valve 34C for controlling the EGR rate of the exhaust.
- a temperature sensor that detects a temperature (exhaust temperature) T of exhaust gas upstream of the reducing agent injection device 28 between the DPF 26B of the continuous regeneration type DPF device 26 and the reducing agent injection device 28. 36 is attached.
- the output signal of the temperature sensor 36 is input to a control unit 38 having a built-in computer.
- output signals of a rotation speed sensor 40 that detects the rotation speed Ne and a load sensor 42 that detects the load Q are also input to the control unit 38.
- the load Q of the diesel engine 10 for example, a state quantity closely related to the torque, such as a fuel supply amount, an intake flow rate, an intake pressure, a supercharging pressure, an accelerator opening degree, and a throttle opening degree, can be applied.
- the rotational speed Ne and the load Q of the diesel engine 10 may be read from an engine control unit (not shown) that electronically controls the diesel engine 10 via a CAN (Controller (Area Network) or the like.
- the control unit 38 executes a control program stored in a non-volatile memory such as a ROM (Read Only Memory), based on the output signals of the temperature sensor 36, the rotation speed sensor 40, and the load sensor 42. It is determined whether or not urea crystals exceeding an allowable value have accumulated in the exhaust system located downstream of the reducing agent injection device 28, that is, downstream of the exhaust point of the urea aqueous solution injection. Further, when the control unit 38 determines that urea crystals exceeding the allowable value have accumulated in the exhaust system, the fuel injection device attached to the diesel engine 10 is used to raise the exhaust temperature and forcibly separate the urea crystals. In response to this, a fuel increase command is output, and a warning lamp 44 (notification device) attached to the combination meter is turned on.
- the “exhaust system” refers to a system including at least the exhaust pipe 24 and the SCR converter 30.
- FIG. 2 shows the contents of a control program that the control unit 38 repeatedly executes every unit time (for example, 1 second) when the diesel engine 10 is started.
- the control unit 38 electronically controls the reducing agent injection device 28 and the EGR control valve 34C in accordance with the engine operating state and the like according to a control program different from the control program shown in FIG.
- step 1 the control unit 38 calculates the urea aqueous solution addition flow rate (injection amount per unit time) according to the engine operating state. That is, the control unit 38 refers to a map (not shown) in which the addition flow rate corresponding to the rotation speed and the load is set, and the rotation speed Ne detected by the rotation speed sensor 40 and the load detected by the load sensor 42. The addition flow rate of the urea aqueous solution according to Q is calculated.
- the urea aqueous solution addition flow rate may be read from a module that electronically controls the reducing agent injection device 28.
- step 2 the control unit 38 estimates the precipitation amount of urea crystals per unit time deposited on the exhaust system based on the exhaust temperature and the addition flow rate of the urea aqueous solution. That is, as shown in FIG. 3, the control unit 38 refers to the deposition amount map (first map) in which the deposition amount corresponding to the exhaust temperature and the addition flow rate is set, and the exhaust temperature detected by the temperature sensor 36. Precipitation amount of urea crystals corresponding to the addition flow rate of T and urea aqueous solution is estimated. In addition, what is necessary is just to obtain
- step 4 the control unit 38 estimates the amount of urea crystal detachment per unit time from the exhaust system based on the exhaust temperature T detected by the temperature sensor 36.
- “departure” means that the urea crystal deposited in the exhaust system is dissolved or vaporized and disappears from the exhaust system. That is, as shown in FIG. 4, the control unit 38 refers to the separation amount map (second map) in which the separation amount corresponding to the exhaust temperature is set, and determines the separation amount of the urea crystals according to the exhaust temperature T. presume. Note that the separation amount map is set to “0” in which the urea crystal cannot be separated in the region where the exhaust temperature is equal to or lower than the separation temperature T 0 of the urea crystal.
- step 6 the control unit 38 determines whether or not the amount of urea crystals deposited is greater than or equal to a predetermined value.
- the predetermined value is a threshold value for determining whether or not the forced detachment process of urea crystals deposited in the exhaust system is to be executed, and is, for example, from an allowable deposition amount of urea crystals allowed in the exhaust system. Slightly lower value.
- control unit 38 determines that the urea crystal deposition amount is greater than or equal to the predetermined value, the control unit 38 proceeds to step 7 (Yes), whereas if the control unit 38 determines that the urea crystal deposition amount is less than the predetermined value, the control unit 38 performs processing. Is terminated (No).
- step 7 the control unit 38 turns on the warning lamp 44 attached to the combination meter so as to notify that the forced detachment process of the urea crystals accumulated in the exhaust system is being executed.
- a buzzer as an example of a notification device may be operated.
- step 8 the control unit 38 raises the exhaust gas temperature above the separation temperature of the urea crystals, so that the urea crystals deposited in the exhaust system are forcibly separated, so that the fuel injection device attached to the diesel engine 10 is used. In response to this, a command for increasing the fuel supply amount is output.
- known forced separation processes such as intake / exhaust shutter opening / closing control, variable turbocharger vane opening control, and post-injection may be executed.
- exhaust gas from the diesel engine 10 is introduced into the DOC converter 26A of the continuous regeneration type DPF device 26 through the exhaust manifold 22 and the turbine 18B of the turbocharger 18.
- Exhaust introduced into the DOC converter 26A flows to being part of the NO is oxidized to NO 2 DPF26B.
- PM in the exhaust gas is collected and removed, and PM is oxidized using NO 2 generated by the DOC converter 26A, so that PM is collected, removed, and regenerated at the same time.
- the urea aqueous solution injected from the reducing agent injection device 28 at a flow rate corresponding to the engine operating state is hydrolyzed using exhaust heat and water vapor in the exhaust, and converted into ammonia that functions as a reducing agent.
- This ammonia is known to be selectively reduced with NOx in the exhaust gas in the SCR converter 30 and purified to water (H 2 O) and nitrogen gas (N 2 ), which are harmless components.
- the ammonia that has passed through the SCR converter 30 is oxidized by the oxidation catalytic converter 32 disposed downstream of the exhaust gas, so that it is possible to suppress the ammonia from being released into the atmosphere as it is.
- the urea crystal precipitation amount estimated from the urea aqueous solution addition flow rate and the exhaust temperature is sequentially integrated, and the urea crystal detachment amount corresponding to the exhaust temperature is sequentially subtracted from this integrated value.
- the amount of urea crystals deposited in the exhaust system located downstream of the exhaust point of the urea aqueous solution injection can be estimated.
- the urea crystals deposited in the exhaust system pay attention to the characteristic that the exhaust temperature decreases in the region where the exhaust temperature is higher than the separation temperature of the urea crystals, and by considering not only the precipitation amount of urea crystals but also the separation amount thereof, The estimation accuracy of the amount of deposited urea crystals can be improved.
- the warning lamp 44 attached to the combination meter is turned on, and the urea crystal forced detachment process is executed.
- the amount of urea crystals deposited in the exhaust system located downstream of the injection point of the urea aqueous solution is written to the nonvolatile memory when the engine is stopped, while the control unit 38 writes the amount of urea crystals from the nonvolatile memory when the engine is started. You may make it read. In this way, since the urea crystal deposition amount is not reset when the engine is stopped, the value calculated so far can be taken over, and a decrease in the estimation accuracy of the urea crystal deposition amount can be suppressed.
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Abstract
Description
図1は、排気浄化装置の一例を示す。
ディーゼルエンジン10の吸気マニフォールド12に接続される吸気管14には、吸気流通方向に沿って、吸気中の埃などを濾過するエアクリーナ16,吸気を過給するターボチャージャ18のコンプレッサ18A,ターボチャージャ18を通過して高温となった吸気を冷却するインタークーラ20がこの順番で配設される。
ステップ4では、コントロールユニット38が、温度センサ36により検出された排気温度Tに基づいて、排気系から離脱する単位時間当たりの尿素結晶の離脱量を推定する。ここで、「離脱」とは、排気系に堆積した尿素結晶が溶解又は気化することで、排気系からなくなることをいう。即ち、コントロールユニット38は、図4に示すように、排気温度に対応した離脱量が設定された離脱量マップ(第2のマップ)を参照し、排気温度Tに応じた尿素結晶の離脱量を推定する。なお、離脱量マップには、排気温度が尿素結晶の離脱温度T0以下の領域では、尿素結晶が離脱され得ない「0」であることが設定されている。
ステップ6では、コントロールユニット38が、尿素結晶の堆積量が所定値以上であるか否かを判定する。ここで、所定値は、排気系に堆積された尿素結晶の強制離脱処理を実行すべきか否かを判定するための閾値であって、例えば、排気系に許容される尿素結晶の許容堆積量より若干低い値を持つ。そして、コントロールユニット38は、尿素結晶の堆積量が所定値以上であると判定すれば処理をステップ7へと進める一方(Yes)、尿素結晶の堆積量が所定値未満であると判定すれば処理を終了させる(No)。
ステップ8では、コントロールユニット38が、排気温度を尿素結晶の離脱温度よりも昇温させることで、排気系に堆積された尿素結晶を強制離脱させるために、ディーゼルエンジン10に取り付けられた燃料噴射装置に対して、燃料供給量の増量指令を出力する。なお、排気温度を上昇させるために、吸気シャッタ又は排気シャッタの開閉制御,可変ターボチャージャのベーン開度制御,ポスト噴射などの公知の強制離脱処理を実行するようにしてもよい。
24 排気管
28 還元剤噴射装置
30 SCRコンバータ
36 温度センサ
38 コントロールユニット
40 回転速度センサ
42 負荷センサ
44 警告灯
Claims (9)
- エンジンの排気管に配設され、尿素水溶液から生成されるアンモニアを使用して窒素酸化物を選択還元浄化する選択触媒還元コンバータと、
前記選択触媒還元コンバータの排気上流にエンジン運転状態に応じた流量の尿素水溶液を噴射する還元剤噴射装置と、
前記還元剤噴射装置の排気上流における排気の温度を検出する温度センサと、
コンピュータを内蔵したコントロールユニットと、
を有し、
前記コントロールユニットが、
前記温度センサにより検出された排気の温度、及び、前記還元剤噴射装置から噴射された尿素水溶液の流量に基づいて、前記尿素水溶液の噴射地点よりも排気下流に位置する排気系に析出する単位時間当たりの尿素結晶の析出量を推定し、
前記温度センサにより検出された排気の温度に基づいて、前記排気系から離脱する単位時間当たりの尿素結晶の離脱量を推定し、
前記尿素結晶の単位時間当たりの析出量及び離脱量に基づいて、前記排気系に堆積されている尿素結晶の堆積量を推定する、
ことを特徴とするエンジンの排気浄化装置。 - 前記コントロールユニットが、更に、前記尿素結晶の堆積量が所定値以上になったときに、前記排気系に堆積されている尿素結晶を強制的に離脱させる時期が到来したと判定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、前記尿素結晶を強制的に離脱させる時期が到来したと判定したときに、報知装置を作動させることを特徴とする請求項2に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、前記尿素結晶を強制的に離脱させる時期が到来したと判定したときに、前記排気系に流入する排気の温度を尿素結晶の離脱温度よりも昇温させる強制離脱処理を実行することを特徴とする請求項2に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、エンジン停止時に、前記尿素結晶の堆積量を不揮発性メモリに書き込む一方、エンジン始動時に、前記不揮発性メモリから尿素結晶の堆積量を読み出すことを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、更に、外部からの指示に応答して、前記尿素結晶の堆積量を強制的にリセットすることを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、排気の温度及び尿素水溶液の噴射流量に対応した析出量が設定された第1のマップを参照して、前記尿素結晶の析出量を推定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、排気の温度に対応した離脱量が設定された第2のマップを参照して、前記尿素結晶の離脱量を推定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
- 前記コントロールユニットが、前記尿素結晶の単位時間当たりの析出量を順次積算しつつ、この積算値から尿素結晶の単位時間当たりの離脱量を順次減算することで、前記尿素結晶の蓄積量を推定することを特徴とする請求項1に記載のエンジンの排気浄化装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112010005468T DE112010005468T5 (de) | 2010-04-09 | 2010-12-03 | Abgasreinigungsvorrichtung für einen Motor |
CN201080065875XA CN102869863A (zh) | 2010-04-09 | 2010-12-03 | 发动机的排气净化装置 |
BR112012025151A BR112012025151A2 (pt) | 2010-04-09 | 2010-12-03 | aparelho de purificação de escape para motor |
US13/647,057 US20130028792A1 (en) | 2010-04-09 | 2012-10-08 | Exhaust purification apparatus for engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-090439 | 2010-04-09 | ||
JP2010090439A JP2011220232A (ja) | 2010-04-09 | 2010-04-09 | エンジンの排気浄化装置 |
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- 2010-12-03 BR BR112012025151A patent/BR112012025151A2/pt not_active IP Right Cessation
- 2010-12-03 DE DE112010005468T patent/DE112010005468T5/de not_active Ceased
- 2010-12-03 CN CN201080065875XA patent/CN102869863A/zh active Pending
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CN103775180A (zh) * | 2014-01-22 | 2014-05-07 | 东风商用车有限公司 | 一种利用废气引流控制排气温度的进气装置 |
Also Published As
Publication number | Publication date |
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CN102869863A (zh) | 2013-01-09 |
DE112010005468T5 (de) | 2013-01-24 |
US20130028792A1 (en) | 2013-01-31 |
BR112012025151A2 (pt) | 2019-09-24 |
JP2011220232A (ja) | 2011-11-04 |
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