JPH0621549B2 - Filter playback device - Google Patents

Filter playback device

Info

Publication number
JPH0621549B2
JPH0621549B2 JP14568785A JP14568785A JPH0621549B2 JP H0621549 B2 JPH0621549 B2 JP H0621549B2 JP 14568785 A JP14568785 A JP 14568785A JP 14568785 A JP14568785 A JP 14568785A JP H0621549 B2 JPH0621549 B2 JP H0621549B2
Authority
JP
Japan
Prior art keywords
filter
exhaust gas
regeneration
gas temperature
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP14568785A
Other languages
Japanese (ja)
Other versions
JPS627912A (en
Inventor
伸一 竹島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP14568785A priority Critical patent/JPH0621549B2/en
Publication of JPS627912A publication Critical patent/JPS627912A/en
Publication of JPH0621549B2 publication Critical patent/JPH0621549B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はディーゼル機関の排気通路に設けられた排気微
粒子捕集用フィルタの再生装置に関する。Description: [Industrial field of application] The present invention relates to a regeneration device for an exhaust particulate collection filter provided in an exhaust passage of a diesel engine.

〔従来の技術および問題点〕[Conventional technology and problems]

ディーゼル機関から排出される排気ガス中の微粒子を捕
集するため、排気管中にフィルタを設け、またこのフィ
ルタにより捕集された微粒子によって排気管内の圧力損
失が増大するのを防止するため、一定走行毎にフィルタ
内の微粒子を焼却により除去することが知られている。
このフィルタの再生は、通常、まず電気ヒータによって
すす等の微粒子が着火され、次いですすの燃焼が伝播す
ることにより行なわれる。A filter is provided in the exhaust pipe to collect the particulates in the exhaust gas discharged from the diesel engine, and a fixed amount is used to prevent the particulates collected by the filter from increasing the pressure loss in the exhaust pipe. It is known to remove fine particles in the filter by incineration every time the vehicle runs.
Regeneration of this filter is usually performed by first igniting fine particles such as soot by an electric heater and then propagating soot combustion.

さて、フィルタの再生において、フィルタの溶損やクラ
ックの発生を防止することの他、再生の終了時を適確に
判断することが必要である。すなわち、例えば再生が不
充分であれば、早い時期にフィルタが再び目詰りを起こ
してしまい、また再生が終了する前にフィルタを迂回す
るバイパス通路を閉じてしまうと、フィルタの温度が上
がり過ぎてフィルタを溶損させるおそれがある。Now, in the regeneration of the filter, it is necessary to prevent the melting and cracking of the filter from occurring and to properly determine the end time of the regeneration. That is, for example, if the regeneration is insufficient, the filter will be clogged again at an early stage, and if the bypass passage bypassing the filter is closed before the regeneration is completed, the temperature of the filter rises too much. It may melt the filter.

なお、フィルタの下流側の温度を再生時期終了の判断に
用いる構成は、特開昭59−153913号公報および実開昭59
−170620号公報に開示されている。Incidentally, the construction in which the temperature on the downstream side of the filter is used to judge the end of the regeneration time is disclosed in JP-A-59-153913 and JP-A-59-59.
-170620 publication.

〔問題点を解決するための手段〕[Means for solving problems]

本発明に係るフィルタの再生装置は、微粒子の着火後、
フィルタの下流側の温度がフィルタの上流側の温度より
も低くなった時、再生を終了することを特徴としてい
る。The filter regeneration device according to the present invention, after ignition of the fine particles,
It is characterized in that the regeneration is terminated when the temperature on the downstream side of the filter becomes lower than the temperature on the upstream side of the filter.

〔実施例〕〔Example〕

以下図示実施例により本発明を説明する。 The present invention will be described below with reference to illustrated embodiments.

第１図および第２図において、機関本体１０から延びる
排気管１１には、ターボチャージャ１２のタービン（図
示せず）が設けられ、このターボチャージャ１２の下流
側に、排気微粒子を捕集するためのトラップ１３が配設
される。トラップ１３は、排気管１１を側方に膨出して
形成したケーシング１４と、このケーシング１４内に収
容されたフィルタ１５と、フィルタ１５の前面に設けら
れた電気ヒータ１６とを備え、フィルタ１５の後面から
延びるトラップ通路１７はフィルタ１５の外側を迂回し
て排気管１１の下流側に達する。一方、フィルタ１５の
前面側とトラップ通路１７の下流側とはバイパス通路１
８により連結される。バイパス弁１９はバイパス通路１
８の下流側とトラップ通路１７の下流側との接合部分に
設けられ、アクチュエータ２０により駆動されてバイパ
ス通路１８の開度を調節する。1 and 2, the exhaust pipe 11 extending from the engine body 10 is provided with a turbine (not shown) of a turbocharger 12 for collecting exhaust particulates on the downstream side of the turbocharger 12. The trap 13 of FIG. The trap 13 includes a casing 14 formed by laterally bulging the exhaust pipe 11, a filter 15 housed in the casing 14, and an electric heater 16 provided on the front surface of the filter 15. The trap passage 17 extending from the rear surface bypasses the outside of the filter 15 and reaches the downstream side of the exhaust pipe 11. On the other hand, the front side of the filter 15 and the downstream side of the trap passage 17 are connected to the bypass passage 1
8 are connected. Bypass valve 19 is bypass passage 1
8 is provided at the joint between the downstream side of 8 and the downstream side of the trap passage 17, and is driven by the actuator 20 to adjust the opening degree of the bypass passage 18.

通常の運転時、バイパス弁１９はバイパス通路１８を閉
じており、排気ガスはフィルタ１５を通過し、トラップ
通路１７を通って排気管１１の出口部２１へ排出され
る。これに対し、再生時、バイパス弁１９はバイパス通
路１８を開放し、これにより大部分の排気ガスはフィル
タ１５を通過することなく排気管１１の出口部２１側へ
流動し、一部の排気ガスだけがフィルタ１５を通過す
る。またこの時、電気ヒータ１６が通電されて発熱し、
フィルタ１５に捕集されたすすが着火して燃焼する。こ
の燃焼は、フィルタ１５の前側から後側へ帯状に進行す
る。電気ヒータ１６への通電が停止された後もフィルタ
１５の燃焼は徐々に進行し、この燃焼はフィルタ１５の
後面まで到達して終了する。その後、バイパス弁１９が
閉弁される。しかしてすすが焼却されて、フィルタ１５
は再生される。During normal operation, the bypass valve 19 closes the bypass passage 18, and the exhaust gas passes through the filter 15 and is discharged to the outlet 21 of the exhaust pipe 11 through the trap passage 17. On the other hand, during regeneration, the bypass valve 19 opens the bypass passage 18, so that most of the exhaust gas flows to the outlet portion 21 side of the exhaust pipe 11 without passing through the filter 15, and part of the exhaust gas is exhausted. Only pass through the filter 15. At this time, the electric heater 16 is energized to generate heat,
The soot collected by the filter 15 ignites and burns. This combustion proceeds in a band shape from the front side of the filter 15 to the rear side. The combustion of the filter 15 gradually progresses even after the power supply to the electric heater 16 is stopped, and the combustion reaches the rear surface of the filter 15 and ends. After that, the bypass valve 19 is closed. However, the soot is incinerated and the filter 15
Is played.

バイパス弁１９の開閉制御および電気ヒータ１６への電
力供給マイクロコンピュータを備えた電子制御部(ECU)2
2 により行なわれる。フィルタ再生時か否かの判断は、
トラップ１３に接続されフィルタに堆積したすすのイン
ピーダンスを検知するローディングセンサ２３の出力信
号により行なわれる。すなわち、ローディングセンサ２
３が検知したすすのインピーダンスを表わす信号は、EC
U 22に入力され、ECU 22はこの信号を基にしてフィルタ
１５上に捕集されたすすの量を検知し、フィルタ再生時
になったか否かを判断する。ECU 22は、再生時、リレー
２４を作動させて電気ヒータ１６への通電を開始させる
とともに、駆動回路２５を介してアクチュエータ２０を
作動させ、バイパス弁１９の開閉を制御する。An electronic control unit (ECU) 2 including a microcomputer for controlling the opening / closing of the bypass valve 19 and supplying electric power to the electric heater 16
Performed by 2. Judgment whether it is during filter regeneration,
This is performed by the output signal of the loading sensor 23 which is connected to the trap 13 and detects the impedance of soot deposited on the filter. That is, the loading sensor 2
The signal representing the soot impedance detected by 3 is EC
The ECU 22 detects the amount of soot collected on the filter 15 based on this signal input to the U 22, and determines whether or not it is time to regenerate the filter. During reproduction, the ECU 22 activates the relay 24 to start energization of the electric heater 16 and activates the actuator 20 via the drive circuit 25 to control opening / closing of the bypass valve 19.

ECU 22は、後述するように、フィルタ１５の上流側およ
び下流側の排気温度に応じてヒータ１６への通電の遮断
およびバイパス弁１９の閉塞を行なう。このため、フィ
ルタ１５の上流側すなわちバイパス通路１８のフィルタ
１５の前面近傍には第１排気温センサ３１が設けられ、
またケーシング１４内であってフィルタ１５の後面近傍
には第２排気温センサ３２が設けられる。As will be described later, the ECU 22 shuts off energization to the heater 16 and closes the bypass valve 19 in accordance with the exhaust temperature on the upstream side and the downstream side of the filter 15. Therefore, the first exhaust temperature sensor 31 is provided on the upstream side of the filter 15, that is, in the vicinity of the front surface of the filter 15 in the bypass passage 18.
A second exhaust gas temperature sensor 32 is provided inside the casing 14 and near the rear surface of the filter 15.

第１排気温センサ３１により計測されるフィルタ１５へ
の流入ガス温度θ１、および第２排気温センサ３２によ
り計測されるフィルタ１５からの排出ガス温度θ２は、
定常走行時、第３図により示されるように変化する。す
なわち、フィルタ１５の再生前におけるバイパス弁１９
の閉塞時、流入ガス温度θ１の方が排出ガス温度θ２よ
りも若干高い。バイパス弁１９を開放すると、始め両温
度θ１，θ２共に多少低下するが、排出ガス温度θ２は
すすの燃焼が始まると徐々に上昇し、燃焼がフィルタ１
５の後面に達するとほぼ最高値に達する。一方、流入ガ
ス温度θ１はほぼ一定であり、その後排出ガス温度θ２
は低下して流入ガス温度θ２よりも低くなり、つまり流
入ガスはフィルタ１５により加熱されないこととなり、
フィルタ１５が発熱しておらず、再生が終了していると
判断される。なお定常走行では上記最高値に達した時点
において再生が終了したと判断することができるが、実
際には車両の加減速により排気温が変動し、排出ガス温
度θ２が極大値をとったからといって再生の終了を判断
することはできない。The inflow gas temperature θ 1 into the filter 15 measured by the first exhaust temperature sensor 31 and the exhaust gas temperature θ 2 from the filter 15 measured by the second exhaust temperature sensor 32 are
During steady running, it changes as shown in FIG. That is, the bypass valve 19 before the regeneration of the filter 15
At the time of closing, the inflow gas temperature θ 1 is slightly higher than the exhaust gas temperature θ 2 . When the bypass valve 19 is opened, both the temperatures θ 1 and θ 2 start to drop to some extent, but the exhaust gas temperature θ 2 gradually rises when the combustion of soot starts, and the combustion proceeds to the filter 1.
When it reaches the rear surface of 5, it reaches almost the maximum value. On the other hand, the inflow gas temperature θ 1 is almost constant, and thereafter the exhaust gas temperature θ 2
Becomes lower than the inflow gas temperature θ 2 , that is, the inflow gas is not heated by the filter 15,
It is determined that the filter 15 does not generate heat and the reproduction is completed. It should be noted that in steady running, it can be judged that the regeneration is completed when the maximum value is reached, but in reality, the exhaust gas temperature fluctuates due to the acceleration and deceleration of the vehicle, and the exhaust gas temperature θ 2 reaches the maximum value. It is not possible to judge the end of reproduction.

ところで、フィルタ１５の再生（すすの燃焼）の途中で
バイパス弁１９を閉じた場合における流入ガス温度θ１
および排出ガス温度θ２の変化を第４図に示すと、この
図から理解されるように、バイパス弁１９を閉じた瞬
間、排出ガス温度θ２すなわちフィルタ内温度は急激に
上昇し、フィルタ１５の許容温度（例えば1000℃）以上
になりやすい。このようにフィルタ１５の温度が上昇し
過ぎるとフィルタ１５の壁が溶損し、すすの捕収率が激
減してフィルタとしての機能が損なわれるおそれがあ
る。したがってバイパス弁１９を閉塞するのは、フィル
タ１５の再生が完全に終了した後でなければならない。By the way, the inflow gas temperature θ 1 when the bypass valve 19 is closed during the regeneration of the filter 15 (combustion of soot)
As shown in FIG. 4, the change in the exhaust gas temperature θ 2 and the change in the exhaust gas temperature θ 2 cause a rapid rise in the exhaust gas temperature θ 2, that is, the temperature inside the filter, at the moment the bypass valve 19 is closed. The temperature is likely to exceed the allowable temperature (for example, 1000 ° C). If the temperature of the filter 15 rises too much in this way, the wall of the filter 15 may melt and the collection rate of soot may be drastically reduced, impairing the function of the filter. Therefore, the bypass valve 19 should be closed only after the regeneration of the filter 15 is completed.

第５図はECU 22によるヒータ１６およびバイパス弁１９
の制御のフローチャートを示す。FIG. 5 shows the heater 16 and the bypass valve 19 by the ECU 22.
The flowchart of control of is shown.

ステップ101 ではその後の処理のために各種のイニシャ
ライズを行ない、ステップ102 ではローディングセンサ
２３の検知した、フィルタ上のすすのインピーダンスを
示す信号を読込む。次にステップ103 では排気ガス圧力
の大きさからフィルタ１５上のすすの量を推定し、フィ
ルタの再生の必要があるか否かを判別する。再生の必要
がなければ再びステップ102 へ戻るが、再生の必要があ
れば次のステップへ進む。In step 101, various initializations are performed for subsequent processing, and in step 102, a signal indicating the impedance of soot on the filter detected by the loading sensor 23 is read. Next, at step 103, the amount of soot on the filter 15 is estimated from the magnitude of the exhaust gas pressure, and it is determined whether or not the filter needs to be regenerated. If reproduction is not necessary, the process returns to step 102, but if reproduction is necessary, the process proceeds to the next step.

しかしてステップ104 ではバイパス弁１９を開放すると
ともにヒータ１６に通電して加熱を開始し、またタイマ
Ｔ１，Ｔ２のカウントアップを始める。これによりフィ
ルタの再生処理が開始する。次にステップ105 で流入ガ
ス温度θ１および排出ガス温度θ２を読込んだ後、ステ
ップ106 において流入ガス温度θ１が排出ガス温度θ２
よりも低いか否かを判別する。流入ガス温度θ１が排出
ガス温度θ２よりも低ければフィルタ１５は加熱されて
再生が開始されているが、もし排出ガス温度θ２の方が
低ければ、ステップ107 へ移ってタイマＴ２の値が所定
値ｔ２以上か否か判別して所定値ｔ２に達するまでステ
ップ105,106,107 を繰返す。タイマＴ２が所定値ｔ２に
達しても排出ガス温度θ２が上昇しなければ、ステップ
108 へ移り、ヒータ１６への通電を遮断するとともに警
告燈を点燈してこのプログラムを終了する。Then, in step 104, the bypass valve 19 is opened, the heater 16 is energized to start heating, and the timers T 1 and T 2 start counting up. This starts the filter regeneration process. Next, in step 105, the inflow gas temperature θ 1 and the exhaust gas temperature θ 2 are read, and in step 106, the inflow gas temperature θ 1 is changed to the exhaust gas temperature θ 2
Is lower than. If the inflow gas temperature θ 1 is lower than the exhaust gas temperature θ 2 , the filter 15 is heated and regeneration is started, but if the exhaust gas temperature θ 2 is lower, the process proceeds to step 107 and the timer T 2 is started. value repeats steps 105, 106 and 107 to to determine whether or not a predetermined value t 2 or reaches a predetermined value t 2. If the exhaust gas temperature θ 2 does not rise even if the timer T 2 reaches the predetermined value t 2 , step
The process proceeds to step 108, the power supply to the heater 16 is cut off, and the warning lamp is turned on to end the program.

ステップ106 において、流入ガス温度θ１の方が排出ガ
ス温度θ２よりも低いと、ステップ109 が実行され、タ
イマＴ１の値が所定値ｔ１になるまで待機する。次にス
テップ110 へ移ってヒータ１６への通電が遮断される。
ステップ111 では、その時における流入ガス温度θ１お
よび排出ガス温度θ２を読込み、ステップ112 へ移って
流入ガス温度θ１が排出ガス温度θ２よりも高いか否か
判別する。もし流入ガス温度θ１の方が低ければ、まだ
フィルタ１５は再生中であるのでステップ111 へ戻り，
逆に、流入ガス温度θ１の方が高ければ、フィルタ１５
の加熱は終了しておりステップ113 へ移ってバイパス弁
１９を閉塞し、このプログラムを終了する。When the inflow gas temperature θ 1 is lower than the exhaust gas temperature θ 2 in step 106, step 109 is executed and the process waits until the value of the timer T 1 reaches the predetermined value t 1 . Next, in step 110, the power supply to the heater 16 is cut off.
At step 111, the inflow gas temperature θ 1 and the exhaust gas temperature θ 2 at that time are read, and the routine proceeds to step 112, where it is determined whether or not the inflow gas temperature θ 1 is higher than the exhaust gas temperature θ 2 . If the inflow gas temperature θ 1 is lower, the filter 15 is still being regenerated, so the process returns to step 111.
Conversely, if the inflow gas temperature θ 1 is higher, the filter 15
Heating has been completed and the routine proceeds to step 113, where the bypass valve 19 is closed and this program ends.

以上のように本実施例によれば、フィルタ１５の再生終
了時を正確に判断することができ、フィルタ１５の再生
中にバイパス弁１９を閉塞するおそれがなくなり、フィ
ルタ１５の溶損を防止することができる。したがってフ
ィルタ１５のトラップ率を常に保持でき、排気ガス中の
パティキュレートの規制値を長期にわたって維持するこ
とができる。またヒータ１５への通電後に再生が開始さ
れない場合には、運転者に異常を知らせることができ、
フィルタ１５が目詰りしたまま車両を走行させたり，あ
るいはフィルタ１５が溶損してパティキュレートの捕集
率が低下したまま車両を走行させたりすることが回避さ
れる。As described above, according to the present embodiment, it is possible to accurately determine the end of regeneration of the filter 15, eliminate the possibility of blocking the bypass valve 19 during regeneration of the filter 15, and prevent melting damage of the filter 15. be able to. Therefore, the trap rate of the filter 15 can always be maintained, and the regulation value of the particulate matter in the exhaust gas can be maintained for a long period of time. If the regeneration is not started after the heater 15 is energized, the driver can be notified of the abnormality,
It is possible to avoid running the vehicle while the filter 15 is clogged, or running the vehicle while the filter 15 is melted and the collection rate of particulates is reduced.

なお本発明は、上記実施例のようにECU 22による制御の
ようにソフトウェアを含むものではなく、電気回路等を
含むハードウェアにより構成することもできる。It should be noted that the present invention does not include software such as the control by the ECU 22 as in the above embodiment, but may be configured by hardware including an electric circuit or the like.

〔発明の効果〕〔The invention's effect〕

以上のように本発明によれば、フィルタの再生終了時を
正確に判断することができ、ひいてはフィルタを確実に
再生することが可能になるという効果が得られる。As described above, according to the present invention, it is possible to accurately determine the end time of the filter regeneration, and thus it is possible to reliably regenerate the filter.

【図面の簡単な説明】[Brief description of drawings]

第１図は本発明の一実施例を適用したディーゼル機関を
示す部分断面側面図、 第２図は第１図のディーゼル機関の平面図、 第３図はフィルタの再生終了時期を正確に判断した場合
における流入ガス温度および排出ガス温度の変化を示す
グラフ、 第４図はバイパス弁をフィルタ再生中に閉じた場合にお
ける流入ガス温度および排出ガス温度の変化を示すグラ
フ、 第５図はECU による制御を示すフローチャートである。 １１……排気管（排気通路）、 １５……フィルタ、 １６……電気ヒータ、 １８……バイパス通路、 １９……バイパス弁、 ３１……第１排気温センサ、 ３２……第２排気温センサ。FIG. 1 is a partial cross-sectional side view showing a diesel engine to which an embodiment of the present invention is applied, FIG. 2 is a plan view of the diesel engine of FIG. 1, and FIG. Fig. 4 is a graph showing changes in inflow gas temperature and exhaust gas temperature, Fig. 4 is a graph showing changes in inflow gas temperature and exhaust gas temperature when the bypass valve is closed during filter regeneration, and Fig. 5 is control by ECU It is a flowchart showing. 11 ... Exhaust pipe (exhaust passage), 15 ... Filter, 16 ... Electric heater, 18 ... Bypass passage, 19 ... Bypass valve, 31 ... First exhaust temperature sensor, 32 ... Second exhaust temperature sensor .

フロントページの続き (56)参考文献 特開 昭59−20513（ＪＰ，Ａ) 特開 昭59−153912（ＪＰ，Ａ) 特開 昭60−22014（ＪＰ，Ａ) 特開 昭61−112717（ＪＰ，Ａ) 特開 昭59−20515（ＪＰ，Ａ) 特開 昭59−153913（ＪＰ，Ａ) 実開 昭59−105015（ＪＰ，Ｕ) 実開 昭59−105016（ＪＰ，Ｕ) 特公 昭62−31165（ＪＰ，Ｂ２) 実公 昭63−35152（ＪＰ，Ｙ２)Continuation of the front page (56) References JP 59-20513 (JP, A) JP 59-153912 (JP, A) JP 60-22014 (JP, A) JP 61-112717 (JP , A) JP 59-20515 (JP, A) JP 59-153913 (JP, A) Actually opened 59-105015 (JP, U) Actually opened 59-105016 (JP, U) JP 62-31165 (JP, B2) Actual public Sho 63-35152 (JP, Y2)

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】ディーゼル機関の排気通路に設けられたフ
ィルタの再生装置であって、上記フィルタに堆積した微
粒子の補集状態を検知し、フィルタ再生の要否を判断す
る再生時期検出手段と、この再生時期検出手段の信号に
基き、フィルタに堆積した微粒子を着火燃焼する着火手
段と、上記排気通路のフィルタより上流側における排気
ガスの温度を検知する第１排気温センサと、上記排気通
路のフィルタより下流側における排気ガスの温度を検知
する第２排気温センサとを備え、上記着火手段による微
粒子の着火後、上記第２排気温センサにより検知された
温度が上記第１排気温センサにより検知された温度より
も低くなった時、フィルタの再生動作を終了することを
特徴とするフィルタの再生装置。1. A regeneration device for a filter provided in an exhaust passage of a diesel engine, the regeneration time detecting means for detecting a collection state of fine particles accumulated on the filter and determining whether or not the filter needs to be regenerated. Based on the signal from the regeneration timing detection means, an ignition means for igniting and burning the particulates deposited on the filter, a first exhaust temperature sensor for detecting the temperature of exhaust gas upstream of the filter in the exhaust passage, and an exhaust passage for the exhaust passage. A second exhaust gas temperature sensor for detecting the temperature of the exhaust gas downstream of the filter, and the temperature detected by the second exhaust gas temperature sensor is detected by the first exhaust gas temperature sensor after ignition of the fine particles by the ignition means. A filter regeneration device characterized by terminating a filter regeneration operation when the temperature becomes lower than a predetermined temperature.
JP14568785A 1985-07-04 1985-07-04 Filter playback device Expired - Fee Related JPH0621549B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14568785A JPH0621549B2 (en) 1985-07-04 1985-07-04 Filter playback device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14568785A JPH0621549B2 (en) 1985-07-04 1985-07-04 Filter playback device

Publications (2)

Publication Number Publication Date
JPS627912A JPS627912A (en) 1987-01-14
JPH0621549B2 true JPH0621549B2 (en) 1994-03-23

Family

ID=15390767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14568785A Expired - Fee Related JPH0621549B2 (en) 1985-07-04 1985-07-04 Filter playback device

Country Status (1)

Country Link
JP (1) JPH0621549B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3869333B2 (en) * 2002-08-12 2007-01-17 ボッシュ株式会社 Exhaust gas purification device

Also Published As

Publication number Publication date
JPS627912A (en) 1987-01-14

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