JP2008523300A - Regeneration control method for electrostatic particulate filter - Google Patents

Regeneration control method for electrostatic particulate filter Download PDF

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JP2008523300A
JP2008523300A JP2007544962A JP2007544962A JP2008523300A JP 2008523300 A JP2008523300 A JP 2008523300A JP 2007544962 A JP2007544962 A JP 2007544962A JP 2007544962 A JP2007544962 A JP 2007544962A JP 2008523300 A JP2008523300 A JP 2008523300A
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particulate filter
regeneration
threshold value
parameter includes
engine
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アリグザーンドゥル デュブレイ−デモル
クワーン ビエン フィーリープ ル
ピエリク モーレル
ピエール ダースィ
ファーブリース リーヴェール
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ルノー・エス・アー・エス
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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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F02D41/029—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 particulate filter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/12—Brake pedal position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2300/00—Purposes or special features of road vehicle drive control systems
    • B60Y2300/47—Engine emissions
    • B60Y2300/476—Regeneration of particle filters
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/06—Fuel or fuel supply system parameters
    • F02D2200/0625—Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F02D2200/0804—Estimation of the temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0812—Particle filter loading
    • 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
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

本発明は微粒子フィルタ（６）を電気的に加熱することによる微粒子フィルタ（６）の再生を制御する方法に関するものである。この方法によれば、計算機（３）が微粒子フィルタ（６）の負荷レベル（Ａ）および温度（Ｔ）に基づいて再生を開始する。この発明の方法は、計算機（３）が微粒子フィルタ（６）の電気的加熱によって生ずる燃料消費を考慮して乗り物の動作に関連したペダル位置等の複数のパラメータを同時に使用することを特徴とする。The present invention relates to a method for controlling regeneration of a particulate filter (6) by electrically heating the particulate filter (6). According to this method, the computer (3) starts regeneration based on the load level (A) and temperature (T) of the particulate filter (6). The method according to the invention is characterized in that the computer (3) simultaneously uses a plurality of parameters such as pedal position related to the operation of the vehicle, taking into account the fuel consumption caused by the electrical heating of the particulate filter (6). .

Description

本発明は自動車の内燃機関の排気パイプに設けられた静電式微粒子フィルタの再生制御方法に関するものである。   The present invention relates to a regeneration control method for an electrostatic particulate filter provided in an exhaust pipe of an internal combustion engine of an automobile.

再生は微粒子フィルタの電気的加熱によって行なわれる。再生の開始はコンピュータに送られる自動車のパラメータによって決定される。   Regeneration is performed by electrical heating of the particulate filter. The start of playback is determined by vehicle parameters sent to the computer.

内燃機関特にディーゼルエンジンから排出された煤微粒子を除去するシステムとしては、内燃機関の排気パイプに設けられた微粒子フィルタが知られている。この微粒子フィルタは排気ガスに含まれる煤微粒子を捕捉する。   As a system for removing soot particulates discharged from an internal combustion engine, particularly a diesel engine, a particulate filter provided in an exhaust pipe of the internal combustion engine is known. This particulate filter captures soot particulates contained in the exhaust gas.

電子制御再生システムは微粒子フィルタによって捕捉された微粒子を定期的に燃やすことによってフィルタの目詰まりを防止する。   Electronically controlled regeneration systems prevent filter clogging by periodically burning particulates captured by the particulate filter.

微粒子フィルタの再生は悪影響を与えず、内燃機関の燃料費への影響を最小限にすることが望まれる。   It is desirable to regenerate the particulate filter without adversely affecting the fuel cost of the internal combustion engine.

事実、煤微粒子は５００〜６００℃の温度で燃える。そして、ディーゼル自動車エンジンの排気ガスによってまれにこのような加熱温度に達することはあるが、たとえば市街地では排気ガスの温度は１５０〜２５０℃である。このため、排気ガスに頼ることなく煤を直接加熱する適切な手段が必要となる。   In fact, soot particles burn at temperatures of 500-600 ° C. And although it may reach such heating temperature rarely with the exhaust gas of a diesel vehicle engine, the temperature of exhaust gas is 150-250 degreeC, for example in an urban area. For this reason, an appropriate means for directly heating the soot without relying on the exhaust gas is required.

排気ガスの温度を微粒子フィルタの微粒子を燃やすのに十分な温度に上昇させる種々の再生システム、特に電気抵抗加熱システムが提案された。
ＥＰ０６０３９０７Ａ ＥＰ１０６３１２０Ａ ＤＥ１０１２７７８２Ａ１ Various regeneration systems, particularly electrical resistance heating systems, have been proposed that raise the temperature of the exhaust gas to a temperature sufficient to burn the particulates of the particulate filter.
EP0603907A EP1063120A DE10127778A1

このような再生システムは制御コンピュータによって電子的に制御され、制御コンピュータは所定数のパラメータによって再生の時期を決定する。しかし、電気的加熱要素のような電気的装置が要求する電力は内燃機関によって駆動される発電機から供給される。微粒子フィルタの再生によって過大な燃料消費が生じ、発電機が即座の電力を供給することができず、電池から放電しなければならなくなることがある。   Such a playback system is electronically controlled by a control computer, and the control computer determines the playback timing according to a predetermined number of parameters. However, the power required by electrical devices such as electrical heating elements is supplied from a generator driven by an internal combustion engine. The regeneration of the particulate filter may cause excessive fuel consumption and the generator may not be able to supply immediate power and must be discharged from the battery.

本発明の目的は、微粒子フィルタの再生に使用される電気的加熱システムのための燃料消費を制限することにある。   It is an object of the present invention to limit fuel consumption for an electrical heating system used for regeneration of particulate filters.

この目的のために、本発明においては、再生制御コンピュータは、再生のために必要な加熱手段に要する電力の発生に関連した燃料消費を決定するためのパラメータを入力する。   For this purpose, in the present invention, the regeneration control computer inputs parameters for determining the fuel consumption related to the generation of power required for the heating means required for regeneration.

本発明の他の特徴は、乗り物から得られたパラメータが、たとえば、ペダル位置、自動車の速度、変速比である。   Another feature of the present invention is that the parameters obtained from the vehicle are, for example, pedal position, vehicle speed, and gear ratio.

本発明の他の特徴および効果は実施の形態の記述を、添付の図面を参照して読むことによって明らかになるであろう。   Other features and advantages of the present invention will become apparent by reading the description of the embodiments with reference to the accompanying drawings.

図１は本発明に係る方法を用いる微粒子フィルタが設けられた内燃機関を示す概略図である。   FIG. 1 is a schematic view showing an internal combustion engine provided with a particulate filter using the method according to the present invention.

図２は本発明に係る方法のフローチャートである。   FIG. 2 is a flowchart of a method according to the present invention.

同一または類似の要素には同じ符合を付した。   The same or similar elements are given the same reference numerals.

図１により提案の再生原理について非限定的に説明する。   The proposed reproduction principle will be described in a non-limiting manner with reference to FIG.

内燃機関１は自動車などの乗り物に使用されるように設計されている。たとえば、一列に並んだ４つのシリンダを有し、直接燃料を噴射するターボチャージャ付のディーゼルエンジンである。内燃機関１には煤微粒子を捕捉する装置を有する排気パイプ５が設けられている。内燃機関１には吸気回路２から空気が供給される。   The internal combustion engine 1 is designed to be used for a vehicle such as an automobile. For example, a diesel engine with a turbocharger that has four cylinders arranged in a row and directly injects fuel. The internal combustion engine 1 is provided with an exhaust pipe 5 having a device for capturing soot particles. Air is supplied from the intake circuit 2 to the internal combustion engine 1.

適切なセンサ、特に、流れセンサ８が、吸気回路２に設けられており、関連のパラメータ、たとえば、内燃機関１への供給圧を、制御コンピュータ３に供給する。シリンダへの燃料噴射は制御コンピュータ３によって電子的に制御される図示しない電磁噴射装置によってなされ、共通の噴射装置を有する高圧タイプの燃料圧縮システム４から燃焼室内に噴射される。内燃機関１から排出された排気ガスは微粒子フィルタ６を介して排気パイプ５から排気される。   Appropriate sensors, in particular the flow sensor 8, are provided in the intake circuit 2 and supply relevant parameters, for example supply pressure to the internal combustion engine 1, to the control computer 3. Fuel injection into the cylinder is performed by an electromagnetic injection device (not shown) that is electronically controlled by the control computer 3, and is injected into the combustion chamber from a high-pressure type fuel compression system 4 having a common injection device. The exhaust gas discharged from the internal combustion engine 1 is exhausted from the exhaust pipe 5 through the particulate filter 6.

たとえば圧力および温度センサなどの、種々のセンサ７は、微粒子フィルタ６の上流および下流に設けられており、制御コンピュータ３に関連のパラメータを供給する。また、排気パイプ５には不燃焼の炭化水素ＨＣおよび一酸化炭素ＣＯの放出を処理する酸化触媒ユニット１０が設けられている。排気ガスの一部はリサイクルシステム１１によって吸気に戻され、リサイクルシステム１１は制御コンピュータ３によって電子的に制御されるバルブ１２を有している。ターボチャージャは、従来と同様に、タービン１４および圧縮器１３を有している。   Various sensors 7, for example pressure and temperature sensors, are provided upstream and downstream of the particulate filter 6 and supply relevant parameters to the control computer 3. Further, the exhaust pipe 5 is provided with an oxidation catalyst unit 10 for treating the release of non-combusted hydrocarbon HC and carbon monoxide CO. Part of the exhaust gas is returned to the intake air by the recycle system 11, and the recycle system 11 has a valve 12 that is electronically controlled by the control computer 3. The turbocharger has a turbine 14 and a compressor 13 as in the prior art.

制御コンピュータ３は、限定的には、マイクロプロセッサすなわち中央処理ユニットＣＰＵ、少なくとも１つのランダムアクセスメモリ、少なくとも１つのリードオンリーメモリ、少なくとも１つのアナログからデジタルへのコンバータおよび少なくとも１つの入力／出力インターフェースを有する。制御コンピュータ３のマイクロプロセッサは電子回路および適切なソフトウエアプログラムを有し、特に電子的に制御される種々のアクチュエータのために設計されている。   The control computer 3 is limited to a microprocessor or central processing unit CPU, at least one random access memory, at least one read-only memory, at least one analog-to-digital converter and at least one input / output interface. Have. The microprocessor of the control computer 3 has electronic circuitry and appropriate software programs and is specifically designed for various actuators that are electronically controlled.

制御コンピュータ３は種々のセンサから送られたパラメータを使用して、燃料消費と性能が要求されるレベルに達するように、共通の噴射装置４内の燃料の圧力および噴射装置の開閉を制御し、特に吸気流量を制御して、エンジン回転数と方式を制御し、測定値を格納する。噴射装置の開動作は吸気開始の時期および噴射装置の開時間を決定し、開時間により燃料噴射量および燃焼室を満たす混合気の濃度に応じた供給圧力を制御する。   The control computer 3 uses parameters sent from various sensors to control the fuel pressure in the common injector 4 and the opening and closing of the injector so that fuel consumption and performance reach the required levels, In particular, the intake flow rate is controlled, the engine speed and method are controlled, and the measured value is stored. The opening operation of the injection device determines the intake start timing and the opening time of the injection device, and controls the supply pressure according to the fuel injection amount and the concentration of the air-fuel mixture that fills the combustion chamber according to the opening time.

また、制御コンピュータ３は排気システム、特に微粒子フィルタ６の動作の制御を行なう。制御コンピュータ３は微粒子フィルタ６の再生の開始を決定し、またその継続あるいは中断を決定する。   The control computer 3 controls the operation of the exhaust system, particularly the particulate filter 6. The control computer 3 determines the start of regeneration of the particulate filter 6, and determines whether to continue or stop the regeneration.

上述したように、再生段階では基本的に直接煤の温度を上昇させ、捕捉した煤を燃やす。温度の上昇はたとえば金属線のような電気的な加熱手段によって行なう。   As described above, in the regeneration stage, basically, the temperature of the soot is directly increased and the captured soot is burned. The temperature is raised by an electric heating means such as a metal wire.

本発明によれば、制御コンピュータ３は再生の開始時期の決定のために、微粒子フィルタ６および乗り物の種々のパラメータ、たとえばエンジン冷却水の温度、微粒子フィルタ６の上流側または下流側のガスの温度、圧力等、乗り物の速度、微粒子フィルタ６に溜まった煤の量、前の再生からの経過時間を入力する。   According to the present invention, the control computer 3 determines various parameters of the particulate filter 6 and the vehicle, such as the temperature of the engine cooling water, the temperature of the gas upstream or downstream of the particulate filter 6 in order to determine the regeneration start time. , Pressure, etc., the speed of the vehicle, the amount of soot collected in the particulate filter 6, and the elapsed time since the previous regeneration.

また、本発明によれば、制御コンピュータ３は加熱システムの動作のための電力発生のための燃料消費に関する他のパラメータを入力する。このパラメータとしてはペダル位置Ｐf、Ｐacc、乗り物の速度Ｖ、変速比Ｈ、エンジン回転数Ｎ、エンジントルクＭがある。   Also according to the present invention, the control computer 3 inputs other parameters relating to fuel consumption for power generation for operation of the heating system. These parameters include pedal position Pf, Pacc, vehicle speed V, gear ratio H, engine speed N, and engine torque M.

この場合、再生の実行において過大な燃料消費、電池の放電を避けるようにする。   In this case, excessive fuel consumption and battery discharge are avoided during regeneration.

図２に微粒子フィルタ再生制御方法のフローチャートを示す。   FIG. 2 shows a flowchart of the particulate filter regeneration control method.

段階１０において、制御コンピュータ３は種々のパラメータ、微粒子フィルタの負荷レベルＡ、乗り物の速度Ｖ、アクセルペダル位置Ｐacc、エンジントルクＭ、エンジン回転数Ｎ、変速比Ｈ、微粒子フィルタの温度Ｔを読み込む。   In step 10, the control computer 3 reads various parameters, the load level A of the particulate filter, the vehicle speed V, the accelerator pedal position Pacc, the engine torque M, the engine speed N, the speed ratio H, and the temperature T of the particulate filter.

段階１１において、制御コンピュータ３が微粒子フィルタ６の負荷レベルＡを読み込んだのち、微粒子フィルタ６の負荷レベルについて第１のチェックを行なう。   In step 11, the control computer 3 reads the load level A of the particulate filter 6, and then performs a first check on the load level of the particulate filter 6.

もし、負荷レベルＡが設定閾値Ｓ１よりも低いときには、段階１７に進み、再生を行なわない。この設定閾値Ｓ１は再生を必要としない閾値Ｓminiよりも高い。   If the load level A is lower than the set threshold value S1, the process proceeds to step 17 and no reproduction is performed. This set threshold value S1 is higher than a threshold value Smini that does not require reproduction.

もし、負荷レベルＡが設定閾値Ｓ１よりも高いときには、段階１２に進む。   If the load level A is higher than the set threshold value S1, the process proceeds to step 12.

段階１２では、ブレーキペダル位置Ｐfについて第２のチェックを行なう。   In step 12, a second check is made for the brake pedal position Pf.

もし、ブレーキペダルが踏み込まれているときすなわち位置Ｐf＝１のときには、段階１４で再生が行なわれる。再生は回生制動によって発生した電気的エネルギーによって行なわれる。回生制動は乗り物が制動されたときに行なわれ、発電機が乗り物の運動エネルギーを加熱手段に供給される電気的エネルギーに変換する。   If the brake pedal is depressed, that is, if the position Pf = 1, regeneration is performed in step 14. Regeneration is performed by electrical energy generated by regenerative braking. Regenerative braking occurs when the vehicle is braked, and a generator converts the kinetic energy of the vehicle into electrical energy supplied to the heating means.

もし、ブレーキペダルが踏み込まれていないときすなわち位置Ｐf＝０のときには、次の段階１３において微粒子フィルタの負荷レベルについて他のチェックが行なわれる。負荷レベルＡが第２の設定閾値Ｓ２（運転者の制動を待つことなく行なわれる再生に要求される高背圧）と比較される。この閾値Ｓ２は設定閾値Ｓ１よりも高く、再生が必須となる閾値Ｓmaxよりも低い。   If the brake pedal is not depressed, that is, if the position Pf = 0, another check is made for the load level of the particulate filter in the next step 13. The load level A is compared with a second set threshold value S2 (high back pressure required for regeneration performed without waiting for the driver's braking). This threshold value S2 is higher than the set threshold value S1, and lower than the threshold value Smax at which reproduction is essential.

もし、負荷レベルＡが設定閾値Ｓ２よりも高いときには、段階１５に進む。この段階１５では制御コンピュータ３が燃料消費に影響する種々のパラメータ、たとえば、乗り物の速度Ｖ、アクセルペダル位置Ｐacc、エンジントルクＭ、エンジン回転数Ｎ、変速比Ｈ、微粒子フィルタの温度Ｔを選択する。   If the load level A is higher than the set threshold value S2, the process proceeds to step 15. In this stage 15, the control computer 3 selects various parameters that affect fuel consumption, such as vehicle speed V, accelerator pedal position Pacc, engine torque M, engine speed N, gear ratio H, and particulate filter temperature T. .

過大な燃料消費であると決定されたときには、まず選択されたパラメータを使用してエンジン効率Ｆを算出する。   When it is determined that the fuel consumption is excessive, the engine efficiency F is first calculated using the selected parameter.

制御コンピュータ３は種々のパラメータの値から、再生によって得られるエンジン効率Ｇと再生を行なわないときに得られるエンジン効率Ｆとを比較する。   The control computer 3 compares the engine efficiency G obtained by the regeneration with the engine efficiency F obtained when the regeneration is not performed from the values of various parameters.

このために、制御コンピュータ３に再生によって得られるエンジン効率Ｇのマップが格納されている。たとえば、内燃機関においては、エンジン効率ＧのマップはエンジントルクＭ、エンジン回転数Ｎに基づいて作成される。制御コンピュータ３によって読み込まれた値は格納されたマップからエンジン効率Ｆを決定するために使用される。エンジン効率Ｆは再生によって得られるエンジン効率Ｇと比較される。もし、再生がエンジン効率を向上させるときには、段階１４で再生が行なわれる。   For this purpose, a map of engine efficiency G obtained by reproduction is stored in the control computer 3. For example, in an internal combustion engine, a map of engine efficiency G is created based on engine torque M and engine speed N. The value read by the control computer 3 is used to determine the engine efficiency F from the stored map. The engine efficiency F is compared with the engine efficiency G obtained by regeneration. If regeneration improves engine efficiency, regeneration occurs at step 14.

もし、再生がエンジン効率を向上させないときには、段階１８で微粒子フィルタの負荷レベルＡが閾値Ｓmaxと比較される。   If regeneration does not improve engine efficiency, the particulate filter load level A is compared to a threshold value Smax at step 18.

もし、負荷レベルＡが閾値Ｓmaxよりも低いときには、段階１７に進み、再生は行なわれない。   If the load level A is lower than the threshold value Smax, the process proceeds to step 17 and reproduction is not performed.

もし、負荷レベルＡが閾値Ｓmaxよりも高いときには、再生がすぐに行なわれる。   If the load level A is higher than the threshold value Smax, regeneration is performed immediately.

本発明に係る方法を用いる微粒子フィルタが設けられた内燃機関を示す概略図である。1 is a schematic view showing an internal combustion engine provided with a particulate filter using the method according to the present invention. 本発明に係る方法のフローチャートである。3 is a flowchart of a method according to the present invention.

Claims (11)

微粒子フィルタを電気的に加熱することによって、上記微粒子フィルタ（６）の再生を制御する方法であって、コンピュータ（３）が上記微粒子フィルタ（６）の負荷レベル（Ａ）および温度（Ｔ）に基づいて再生を開始し、上記コンピュータ（３）が上記微粒子フィルタ（６）の電気的加熱によって生ずる燃料消費を考慮して乗り物の動作に関連した複数のパラメータを同時に使用することを特徴とする微粒子フィルタ（６）の再生制御方法。   A method of controlling the regeneration of the particulate filter (6) by electrically heating the particulate filter, wherein the computer (3) sets the load level (A) and temperature (T) of the particulate filter (6). And the computer (3) simultaneously uses a plurality of parameters related to the operation of the vehicle in consideration of fuel consumption caused by electrical heating of the particulate filter (6). A regeneration control method for the filter (6). 上記パラメータがブレーキペダル位置（Ｐf）を含むことを特徴とする請求項１に記載の微粒子フィルタ（６）の再生制御方法。   2. The method according to claim 1, wherein the parameter includes a brake pedal position (Pf). −上記負荷レベル（Ａ）が設定閾値Ｓ１よりも高く、
−かつブレーキペダルが踏み込まれていて、Ｐf＝１であるとき、
上記コンピュータ（３）が上記微粒子フィルタ（６）の再生を行なうことを特徴とする請求項１または２に記載の微粒子フィルタ（６）の再生制御方法。 The load level (A) is higher than the set threshold S1,
-And when the brake pedal is depressed and Pf = 1,
The regeneration control method for the particulate filter (6) according to claim 1 or 2, wherein the computer (3) performs regeneration of the particulate filter (6). 上記閾値Ｓ１は再生を必要としない低い閾値Ｓminiよりも高いことを特徴とする請求項３に記載の微粒子フィルタ（６）の再生制御方法。   4. The regeneration control method for the particulate filter (6) according to claim 3, wherein the threshold value S1 is higher than a low threshold value Smini that does not require regeneration. −上記負荷レベル（Ａ）が上記閾値Ｓ１よりも高い設定閾値Ｓ２よりも高く、
−ブレーキペダルが踏み込まれておらず、Ｐf＝０であり、
−かつ選択されたパラメータによって算出されたエンジン効率（Ｆ）が、微粒子フィルタ（６）の再生によって得られるエンジン効率（Ｇ）よりも低いとき、
上記コンピュータ（３）が上記微粒子フィルタ（６）の再生を行なうことを特徴とする請求項３または４に記載の微粒子フィルタ（６）の再生制御方法。 The load level (A) is higher than a set threshold S2 higher than the threshold S1,
-The brake pedal is not depressed, Pf = 0,
-And when the engine efficiency (F) calculated by the selected parameter is lower than the engine efficiency (G) obtained by regeneration of the particulate filter (6),
The regeneration control method for the particulate filter (6) according to claim 3 or 4, wherein the computer (3) regenerates the particulate filter (6). 上記閾値Ｓ２が再生を必須とする閾値Ｓmaxよりも低いことを特徴とする請求項５に記載の微粒子フィルタ（６）の再生制御方法。   The method for controlling regeneration of a particulate filter (6) according to claim 5, wherein the threshold value S2 is lower than a threshold value Smax that requires regeneration. 上記パラメータが変速比（Ｈ）を含むことを特徴とする請求項５または６に記載の微粒子フィルタ（６）の再生制御方法。   The method according to claim 5 or 6, wherein the parameter includes a gear ratio (H). 上記パラメータがアクセルペダル位置（Ｐacc）を含むことを特徴とする請求項５または６に記載の微粒子フィルタ（６）の再生制御方法。   The method according to claim 5 or 6, wherein the parameter includes an accelerator pedal position (Pacc). 上記パラメータが乗り物の速度（Ｖ）を含むことを特徴とする請求項５または６に記載の微粒子フィルタ（６）の再生制御方法。   The method according to claim 5 or 6, wherein the parameter includes a vehicle speed (V). 上記パラメータがエンジン回転数（Ｎ）を含むことを特徴とする請求項５または６に記載の微粒子フィルタ（６）の再生制御方法。   The method according to claim 5 or 6, wherein the parameter includes an engine speed (N). 上記パラメータがエンジントルク（Ｍ）を含むことを特徴とする請求項５または６に記載の微粒子フィルタ（６）の再生制御方法。   The method according to claim 5 or 6, wherein the parameter includes an engine torque (M).
JP2007544962A 2004-12-13 2005-12-07 Regeneration control method for electrostatic particulate filter Withdrawn JP2008523300A (en)

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