JPS63140856A - Exhaust gas recirculation controller - Google Patents
Exhaust gas recirculation controllerInfo
- Publication number
- JPS63140856A JPS63140856A JP61286023A JP28602386A JPS63140856A JP S63140856 A JPS63140856 A JP S63140856A JP 61286023 A JP61286023 A JP 61286023A JP 28602386 A JP28602386 A JP 28602386A JP S63140856 A JPS63140856 A JP S63140856A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- egr rate
- exhaust gas
- gas recirculation
- oxygen concentration
- 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.)
- Granted
Links
- 239000001301 oxygen Substances 0.000 claims abstract description 49
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 34
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 4
- 150000002926 oxygen Chemical class 0.000 abstract 1
- 230000004043 responsiveness Effects 0.000 abstract 1
- 239000000446 fuel Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、酸素濃度センサによりＥＧＲ率を測定し、
排気ガス再循環弁装置を制御する内燃機関の排気ガス再
循環制御装置に関する。[Detailed Description of the Invention] [Industrial Application Field] This invention measures the EGR rate with an oxygen concentration sensor,
The present invention relates to an exhaust gas recirculation control device for an internal combustion engine that controls an exhaust gas recirculation valve device.
内燃機関の排気ガス再循環（ＥＧＲ）装置において排気
ガス再循環率（ＥＧＲ率）を検出するため酸素濃度セン
サを設けたものが知られている。2. Description of the Related Art Exhaust gas recirculation (EGR) devices for internal combustion engines are known in which an oxygen concentration sensor is provided to detect the exhaust gas recirculation rate (EGR rate).
（例えば、特開昭６０−１３８２６３号参照、）このタ
イプのＥＧＲ検出装置は、排気ガスのデポジットの影響
を受けることなく正確なＥＧＲ率を知ることができる利
点がある。即ち、酸素濃度センサは還流排気ガスも含め
た全吸入空気中の酸素濃度を検出する。従って、もし空
燃比が一定に制御されていると仮定すれば、還流ガスの
流量の変化に応じて酸素濃度センサからの信号レベルが
変化し、酸素濃度センサの信号レベルはＥＧＲ率を表す
ことになる。そして、酸素濃度センサからの信号によっ
て、所望ＥＧＲ率となるようにＥＧＲ弁を制御すること
ができる。(For example, see Japanese Patent Laid-Open No. 60-138263.) This type of EGR detection device has the advantage of being able to accurately determine the EGR rate without being affected by exhaust gas deposits. That is, the oxygen concentration sensor detects the oxygen concentration in all intake air including recirculated exhaust gas. Therefore, if it is assumed that the air-fuel ratio is controlled to be constant, the signal level from the oxygen concentration sensor will change according to changes in the flow rate of recirculated gas, and the signal level of the oxygen concentration sensor will represent the EGR rate. Become. Then, the EGR valve can be controlled to achieve a desired EGR rate based on the signal from the oxygen concentration sensor.
従来技術では機関の運転条件で定まる目標ＥＧＲ率と、
酸素濃度センサにより実測されるＥＧＲ率との偏差を検
出し、この偏差が解消する方向にＥＧＲ弁の開度を増減
制御しいる。ところが、この制御方法では、運転状態が
急変し、ＥＧＲ弁の目標開度が大きく変化したとき、フ
ィードバック系の作動遅れが大きい。そのため、過渡的
に排気ガスの浄化性能が悪化することがある。In conventional technology, the target EGR rate is determined by the engine operating conditions,
A deviation from the EGR rate actually measured by the oxygen concentration sensor is detected, and the opening degree of the EGR valve is controlled to increase or decrease in a direction that eliminates this deviation. However, with this control method, when the operating state suddenly changes and the target opening degree of the EGR valve changes significantly, the feedback system has a large operational delay. Therefore, the exhaust gas purification performance may deteriorate transiently.
この発明では運転条件の急変時にもＥＧＲ率を目標値に
迅速に制御することができるようにすることを目的とす
る。An object of the present invention is to enable the EGR rate to be quickly controlled to a target value even when operating conditions suddenly change.
この発明の内燃機関の排気ガス再循環制御装置は、第１
図に示すように、内燃機関の排気管１ａから吸気管１ｂ
への還流排気ガスの流量を所望排気ガス再循環率を得る
ため制御するためのの排気ガス再循環弁２と、排気ガス
再循環弁２からの還流排気ガスを含めた状態で内燃機関
への全吸入空気中の酸素濃度を検出し、これよりＥＧＲ
率を算出するＥＧＲ率検出手段３と、エンジンの運転条
件に応じたＥＧＲ率の目標値を設定する手段４と、エン
ジンの運転条件に応じた排気ガス再循環弁２の目標開度
を設定する手段５と、ＥＧＲ率の検出値と目標値とによ
り、排気ガス再循環弁の開度のフィードバック因子を算
出する手段６と、上記フィードバック因子によって目標
開度を修正し、排気ガス再循環弁の駆動信号を形成する
手段７とから構成される。The exhaust gas recirculation control device for an internal combustion engine according to the present invention includes a first
As shown in the figure, from the exhaust pipe 1a of the internal combustion engine to the intake pipe 1b
an exhaust gas recirculation valve 2 for controlling the flow rate of recirculated exhaust gas to the internal combustion engine to obtain a desired exhaust gas recirculation rate; The oxygen concentration in the total intake air is detected, and EGR
EGR rate detection means 3 for calculating the EGR rate, means 4 for setting a target value of the EGR rate according to the engine operating conditions, and setting a target opening degree of the exhaust gas recirculation valve 2 according to the engine operating conditions. means 5; means 6 for calculating a feedback factor for the opening degree of the exhaust gas recirculation valve based on the detected value and target value of the EGR rate; and means 6 for correcting the target opening degree based on the feedback factor; and means 7 for forming a drive signal.
第２図において、１０はシリンダブロック、１２はピス
トン、１４はコネクティングロッド、１６は燃焼室、１
８はシリンダヘッド、２０は吸気弁、２２は吸気ポート
、２４は排気弁、２６は排気ボートである。吸気ボート
２２は吸気管２８、サージタンク３０、スロットル弁３
２を介してエアークリーナ３４に接続される。３５は燃
料インジェクタであり、吸気ポート２２に近接した吸気
管２８に配置される。排気ボート２６は排気マニホルド
３６に接続される。３８はディストリビュータを示して
いる。In FIG. 2, 10 is a cylinder block, 12 is a piston, 14 is a connecting rod, 16 is a combustion chamber, 1
8 is a cylinder head, 20 is an intake valve, 22 is an intake port, 24 is an exhaust valve, and 26 is an exhaust boat. The intake boat 22 includes an intake pipe 28, a surge tank 30, and a throttle valve 3.
2 to the air cleaner 34. 35 is a fuel injector, which is arranged in the intake pipe 28 close to the intake port 22. Exhaust boat 26 is connected to exhaust manifold 36. 38 indicates a distributor.
排気マニホルド３６と吸気管２８とを結ぶ排気ガス再循
環通路（ＥＧＲ通路）４０が設けられ、ＥＧＲ通路４０
上に排気ガス再循環制御弁（ＥＧＲ弁）４２が設置され
る。ＥＧＲ弁４２はダイヤフラム４４に連結され、ダイ
ヤフラム４４にかがる負圧に応じて、ＥＧＲ弁４２の開
度が制御される。An exhaust gas recirculation passage (EGR passage) 40 connecting the exhaust manifold 36 and the intake pipe 28 is provided.
An exhaust gas recirculation control valve (EGR valve) 42 is installed above. The EGR valve 42 is connected to a diaphragm 44, and the opening degree of the EGR valve 42 is controlled according to the negative pressure applied to the diaphragm 44.
ダイヤフラム４４は、第１の圧力導管４６によってサー
ジタンク３０の負圧ボート３０ａに接続されると共に、
第２の圧力導管４８によってスロットル弁３２の上流の
大気圧ボート５ｏに接続される。第１の圧力導管４６に
負圧制御弁５２が設けられ、第２の圧力導管４８に大気
圧制御弁５４が設置される。負圧制御弁５２及び大気圧
制御弁５４の開度を制御することにより、ダイヤフラム
４４に作用する負圧が制御され、ダイヤフラム４４は圧
縮ばね５６の付勢力とバランスするリフトをとり、還流
ガス量を任意に制御することが可能になる。The diaphragm 44 is connected to the negative pressure boat 30a of the surge tank 30 by a first pressure conduit 46, and
A second pressure conduit 48 is connected to the atmospheric pressure boat 5o upstream of the throttle valve 32. A negative pressure control valve 52 is provided in the first pressure conduit 46 and an atmospheric pressure control valve 54 is provided in the second pressure conduit 48 . By controlling the opening degrees of the negative pressure control valve 52 and the atmospheric pressure control valve 54, the negative pressure acting on the diaphragm 44 is controlled, and the diaphragm 44 takes a lift that balances the biasing force of the compression spring 56, thereby reducing the amount of recirculated gas. can be controlled arbitrarily.
制御回路６０は、この発明に従ったＥＧＲ率の検出作動
、及びＥＧＲ率の制御作動を行うもので、マイクロコン
ピュータシステムとして構成される。The control circuit 60 performs an EGR rate detection operation and an EGR rate control operation according to the present invention, and is configured as a microcomputer system.
即ち、制御回路６０はマイクロプロセシングユニット（
ＭＰＵ）６０ａと、メモリ６０ｂと、入力ポートロ０ｃ
と、出力ポートロ０ｄと、これらを接続するバス６０ｅ
とを基本的な構成要素とする。That is, the control circuit 60 is a microprocessing unit (
MPU) 60a, memory 60b, input port 0c
, the output port 0d, and the bus 60e that connects them.
and are the basic components.
人力ポートロ０ｄは種々のセンサに接続され、各運転条
件信号が入力される。スロットルセンサ６２はスロット
ル弁３２に連結され、スロットル弁３２の開度に応じた
信号を発生する。吸気管圧力センサ６４はサージタンク
３０に接続され、す−ジタンク３０内の吸気管圧力に応
じた信号を発生する。クランク角センサ６６は、ディス
トリビュータ３８に設けられ、クランク軸の角度位置に
応じた、例えば３０°ＣＡ毎のパルス信号を発生し、周
知のように、エンジン回転数を知ることができる。第１
の酸素濃度センサ６８は排気マニホルド３６に設置され
る。第１の酸素濃度センサ６８は、酸素濃度に応じて連
続的に変化するレベルの信号を発生するりニア０□セン
サ（又はり一ンセンサ）として構成され、周知のように
０□センサからの信号によって燃料インジエクタ３５か
らの燃料噴射量が制御され、所定空燃比に維持される。The human power port 0d is connected to various sensors, and each operating condition signal is input thereto. The throttle sensor 62 is connected to the throttle valve 32 and generates a signal according to the opening degree of the throttle valve 32. The intake pipe pressure sensor 64 is connected to the surge tank 30 and generates a signal corresponding to the intake pipe pressure within the surge tank 30. The crank angle sensor 66 is provided in the distributor 38 and generates a pulse signal, for example, every 30° CA, depending on the angular position of the crankshaft, so that the engine rotation speed can be determined as is well known. 1st
An oxygen concentration sensor 68 is installed in the exhaust manifold 36. The first oxygen concentration sensor 68 is configured as a near 0□ sensor (or 1 sensor) that generates a signal at a level that continuously changes depending on the oxygen concentration, and as is well known, the first oxygen concentration sensor 68 generates a signal at a level that continuously changes depending on the oxygen concentration. The amount of fuel injected from the fuel injector 35 is controlled and maintained at a predetermined air-fuel ratio.
この発明によれば、第２の酸素濃度センサ７０が吸気管
７０に設けられ、ＥＧＲ通路４０からの還流ガスも含め
た全吸入空気中の酸素濃度を知ることができる。第２の
酸素濃度センサ７０も前記第１酸素濃度センサと同様に
リニア０２センサ（又はリーンセンサ）として周知の構
成のものであり、酸素濃度の連続的な変化を検出するこ
とができるものである。そして、吸気管圧力センサ６４
により検出される吸気管圧力と組合わせることによりＥ
ＧＲ率を検出することができる。このＥＧＲ率測定原理
を説明すると、第２の酸素濃度センサ７０によって、Ｅ
ＧＲガスも含めた形での全吸入空気中の酸素濃度ＭＰＯ
□を検出することができる。このようにして検出された
酸素濃度ＭＰＯｆを空気密度である０、２１で割ること
により全吸入空気中に占める新気の分圧を知ることがで
きる。従って、ＥＧＲガスを含めた全吸入空気の圧力を
ＰＭとすれば実測値としてのＥＧＲ率（ＥＧＲｃ ）は
、基本的には、
（Ｐ Ｍ −ＭＰＯ□１０．２１） ／ＰＭによって算
出することができる。尚、第３図はＥＧＲ率と酸素濃度
ＭＰＯ！との関係を各吸気管圧力ＰＭについて示すグラ
フである。更に、第２酸素濃度センサ７０による計測値
ＭＰＯｆは還流排気ガス中に残留される酸素濃度を計測
している。還流排気ガス中に残留される酸素濃度の影響
を排除するため、第１酸素濃度センサによる排気管中の
酸素濃度をＥＰＯ，とじたとき、ＥＧＲ率を測定するた
めの上記式は、
（Ｐ Ｍ −（？ＩＰＯ！ Ｉ！Ｐｏｔ） ／ ０．
２１） ／ Ｐ Ｍとして修正され、これによってより
正確なＥＧＲ率を知ることができる−
そして、この発明によるＥＧＲ率制種制御、エンジン運
転条件に応じてＥＧＲ弁の目標開度及び目標ＥＧＲ率を
算出し、前記ＥＧＲ弁の目標開度を、上記原理で実測さ
れるＥＧＲ率と目標ＥＧＲ率との偏差に基づくフィード
バック因子により補正するようにしている。According to this invention, the second oxygen concentration sensor 70 is provided in the intake pipe 70, and the oxygen concentration in all the intake air including the recirculated gas from the EGR passage 40 can be determined. Like the first oxygen concentration sensor, the second oxygen concentration sensor 70 also has a configuration known as a linear 02 sensor (or lean sensor), and is capable of detecting continuous changes in oxygen concentration. . And the intake pipe pressure sensor 64
By combining with the intake pipe pressure detected by E
GR rate can be detected. To explain the principle of this EGR rate measurement, the second oxygen concentration sensor 70 measures the EGR rate.
Oxygen concentration MPO in total intake air including GR gas
□ can be detected. By dividing the oxygen concentration MPOf thus detected by the air density of 0.21, the partial pressure of fresh air in the total intake air can be determined. Therefore, if PM is the pressure of the total intake air including EGR gas, the EGR rate (EGRC) as an actual value can basically be calculated by (PM - MPO□10.21) /PM. can. Furthermore, Figure 3 shows EGR rate and oxygen concentration MPO! It is a graph showing the relationship between each intake pipe pressure PM. Furthermore, the measured value MPOf by the second oxygen concentration sensor 70 measures the oxygen concentration remaining in the recirculated exhaust gas. In order to eliminate the influence of the oxygen concentration remaining in the recirculated exhaust gas, when the oxygen concentration in the exhaust pipe measured by the first oxygen concentration sensor is expressed as EPO, the above formula for measuring the EGR rate is (P M -(?IPO! I!Pot) / 0.
21) Modified as /PM, thereby making it possible to know a more accurate EGR rate - And, the EGR rate type control according to the present invention, the target opening degree of the EGR valve and the target EGR rate are adjusted according to the engine operating conditions. The target opening degree of the EGR valve is corrected using a feedback factor based on the deviation between the EGR rate actually measured based on the above principle and the target EGR rate.
以上説明したこの発明のＥＧＲ率制種制御施する制御回
路６０の作動を第４図のフローチャートによって説明す
る。ステップ８０では、現在機関がＥＧＲ作動域にある
か否か判別される０例えば、スロットル弁３２が僅か開
けられた低負荷運転域はＥ Ｇ Ｒ領域である。ＥＧＲ
域でないときはステップ８２に進み、アイドル条件か否
かが判別される。アイドル条件はスロットル弁３２がア
イドル開度にあり、且つエンジン回転数が所定値より小
さいことによって把握することが可能である。アイドル
状態であるとすれば、ステップ８４に進み、アイドル状
態での吸気管における酸素濃度の基準値であるへｉｒＰ
鵠がメモリ６０ｂより入力される。The operation of the control circuit 60 that performs the EGR rate type control of the present invention described above will be explained with reference to the flowchart of FIG. In step 80, it is determined whether or not the engine is currently in the EGR operating range. For example, the low-load operating range where the throttle valve 32 is slightly opened is the EGR range. EGR
If the condition is not within the range, the process proceeds to step 82, where it is determined whether the idle condition is met. The idle condition can be determined by the throttle valve 32 being at the idle opening and the engine speed being lower than a predetermined value. If it is in the idle state, the process proceeds to step 84, where irP, which is the reference value of the oxygen concentration in the intake pipe in the idle state, is determined.
The mouse is input from the memory 60b.
ステップ８６では、出力較正値Ｋが、アイドル基準値Ａ
ｉｒＰＯ□の、第２ｅ１１素淵度センサ７０により実測
される酸素濃度ＭＰＯｆの比として算出される。即ち、
ＥＧＲ率と、第２酸素濃度センサ７０により実測される
酸素濃度ＭＰＯ□との間には吸気管圧力を固定すれば線
型関係があることは第３図の通りであるが、この場合比
例定数、即ち直線の傾斜は第５図のようにバラツキがあ
る。これを、そのままとすると正確なＥＧＲ率制種制御
きなくなる。そこで、ＥＧＲを行わない一定の運転時、
例えばアイドル時における酸素濃度の基準値を記憶して
おき、これと実際の運転時に第２酸素濃度センサ７０に
より実測されるアイドル時の酸素濃度値ＭＰＯ□との比
である出力較正値Ｋを算出し、この出力較正値Ｋをセン
サの実測値に乗算することで、酸素濃度センサの実測値
ＭＰ（ｈの較正を行い、バラツキを防止するものである
。In step 86, the output calibration value K is set to the idle reference value A.
It is calculated as a ratio of the oxygen concentration MPOf of irPO□ actually measured by the second e11 depth sensor 70. That is,
As shown in Fig. 3, there is a linear relationship between the EGR rate and the oxygen concentration MPO□ actually measured by the second oxygen concentration sensor 70 if the intake pipe pressure is fixed. That is, the slope of the straight line varies as shown in FIG. If this is left as is, accurate EGR rate control will not be possible. Therefore, during constant operation without EGR,
For example, a reference value of oxygen concentration during idling is stored, and an output calibration value K is calculated, which is the ratio between this value and the oxygen concentration value MPO□ during idling, which is actually measured by the second oxygen concentration sensor 70 during actual operation. However, by multiplying the actual measured value of the sensor by this output calibration value K, the actual measured value MP (h) of the oxygen concentration sensor is calibrated to prevent variations.
ステップ８８では、ＥＧＲ弁開度信号を格納するメモリ
番地ＥＧＲＤにＥＧＲ弁４２の全閉に相当する値である
０が入れられる。そのため、後述の通り、ＥＧＲ弁４２
は閉鎖される。In step 88, 0, which is a value corresponding to fully closing the EGR valve 42, is entered into the memory address EGRD that stores the EGR valve opening signal. Therefore, as described later, the EGR valve 42
will be closed.
ステップ８０でＥＧＲ条件と判別されるときはステップ
９０に流れ、機関運転条件によって決められる目標ＥＧ
Ｒ率であるＥＧＲ，の演算が実行される。ＥＧＲ６の値
は運転状態、例えば負荷としての吸気管圧力及び回転数
によって決まる。即ち、メモリ６０ｂには、負荷及び回
転数の組合せに対するＥＧＲ，の値が格納されてあり、
センサ６４．６６により実測される負荷及び回転数に対
するＥＧＲ，の値が補間演算される。When the EGR condition is determined in step 80, the flow goes to step 90, and the target EG condition determined by the engine operating condition is
The calculation of EGR, which is the R rate, is performed. The value of EGR6 is determined by the operating condition, for example, the intake pipe pressure as a load and the rotation speed. That is, the memory 60b stores EGR values for combinations of load and rotation speed.
The EGR values for the load and rotational speed actually measured by the sensors 64 and 66 are interpolated.
次のステップ９２ではステップ９０で演算されるＥＧＲ
率目標値ＥＧＲ，を得ることができる目標ＥＧＲ弁開度
（ＥＧＲ，）Ｄ）が算出される。ＥＧＲ，Ｄの算出方法
はＥＧＲ６の算出方法と同様であり、メモリに負荷、回
転数に応じたＥＧＲ，Ｄのデータが格納されてあり、セ
ンサ６４．６６により実測される負荷、回転数に対する
補間演算が実行される。In the next step 92, the EGR calculated in step 90 is
A target EGR valve opening degree (EGR, )D) that can obtain the rate target value EGR, is calculated. The calculation method of EGR, D is the same as the calculation method of EGR6, and the data of EGR, D according to the load and rotation speed are stored in the memory, and the data of EGR, D according to the load and rotation speed are actually measured by the sensors 64 and 66. The operation is executed.
ステップ９４では、第２酸素濃度センサ７０により算出
される酸素濃度信号値ＭＰＯＲにステップ８６で算出さ
れた較正値Ｋを乗算することで、酸素濃度信号のバラツ
キ補正が行われる。In step 94, the oxygen concentration signal value MPOR calculated by the second oxygen concentration sensor 70 is multiplied by the calibration value K calculated in step 86, thereby correcting the variation in the oxygen concentration signal.
ステップ９６は、現在実測されるＥＧＲ率であるＥＧＲ
ｃが、
（ＰＭ−（ＭＰＯ□−ＥＰＯ□） １０．２１） ／Ｐ
Ｍによって算出される。ここにＥＰＯｇは第１酸素濃度
センサ６８による排気ガス中の酸素濃度である。Step 96 is the EGR rate which is the currently measured EGR rate.
c is (PM-(MPO□-EPO□) 10.21) /P
Calculated by M. Here, EPOg is the oxygen concentration in the exhaust gas measured by the first oxygen concentration sensor 68.
ステップ９８では、この実測ＥＧＲ率であるＥＧＲＣか
らステップ９０で算出される目標ＥＧＲ率であるＥＧＲ
Ｏとの偏差Δが算出される。In step 98, EGR, which is the target EGR rate calculated in step 90, from EGRC, which is the actually measured EGR rate, is calculated.
The deviation Δ from O is calculated.
ステップ１００では、ＥＧＲ率フシフイードバック補正
係数るＦＥＧＲを格納するアドレスの内容が現在値にに
×Δを加えたものに更新される。ここにｋはフィードバ
ックゲインとなる。ステップ１０２では、ＥＧＲ弁開度
信号を入れるアドレスＥＧＲＤの内容が現在値にＥＧＲ
弁開度目標値ＥＧＲ，Ｄにフィードバラ補正係数ＦＥＧ
Ｒを乗算したものとされる。In step 100, the content of the address storing the EGR rate feedback correction coefficient FEGR is updated to the current value plus ×Δ. Here, k is the feedback gain. In step 102, the contents of the address EGRD into which the EGR valve opening signal is input are changed to the current value.
Feed variation correction coefficient FEG is added to the valve opening target value EGR, D.
It is assumed to be multiplied by R.
ステップ１０４ではＥＧＲ弁駆動信号形成処理が行われ
、ステップ１０２で算出されるＥＧＲ弁開度が得られる
よう、負圧制御弁５４、大気圧制御弁５２の駆動信号が
形成される。例えば、計算されたＥＧＲ弁開度が得られ
るようなデユーティ比を持ったパルス信号が形成され負
圧制御弁５２、大気圧制御弁５４に印加される。即ち、
負圧制御弁５２はＥＧＲＤに正比例するデユーティ比を
持ったパルス信号で駆動され、大気圧制御弁５４はＥＧ
ＲＤに反比例するデユーティ比を持ったパルス信号で駆
動される。In step 104, EGR valve drive signal formation processing is performed, and drive signals for the negative pressure control valve 54 and atmospheric pressure control valve 52 are formed so as to obtain the EGR valve opening calculated in step 102. For example, a pulse signal having a duty ratio that allows the calculated EGR valve opening degree to be obtained is generated and applied to the negative pressure control valve 52 and the atmospheric pressure control valve 54. That is,
The negative pressure control valve 52 is driven by a pulse signal with a duty ratio directly proportional to EGRD, and the atmospheric pressure control valve 54 is driven by a pulse signal having a duty ratio directly proportional to EGRD.
It is driven by a pulse signal with a duty ratio inversely proportional to RD.
コノ発明によるＥＧＲ率制御では、エンジン運転条件に
応じてＥＧＲ弁の目標開度（ＥＧＲ，Ｄ）及び目標ＥＧ
Ｒ率（ＥＧＲ６）を算出し、前記ＥＧＲ弁の目標開度（
１！ＧＲＯＤ）を、ＥＧＲ率の実測値と目標ＥＧＲ率と
の偏差（ＥＧＲＣ−ＥＧＲ，＝Δ）に基づくフィードバ
ック因子により補正するようにしている。そのため、運
転条件が急変し目標ＥＧＲ率が急変したとき、ＥＧＲ弁
４２はフィードホオワード制御により目標開度（ＥＧＲ
６Ｄ）の直ぐ近くの目標ＥＧＲ率まで即座に制御され、
それからフィードバックによって精密に目標ＥＧＲ率に
制御される。In the EGR rate control according to Kono's invention, the target opening degree (EGR, D) of the EGR valve and the target EG
The R rate (EGR6) is calculated, and the target opening degree of the EGR valve (
1! GROD) is corrected by a feedback factor based on the deviation (EGRC-EGR,=Δ) between the actual measured value of the EGR rate and the target EGR rate. Therefore, when the operating conditions suddenly change and the target EGR rate suddenly changes, the EGR valve 42 is controlled to the target opening (EGR) by feed forward control.
6D) is immediately controlled to the target EGR rate immediately nearby,
The EGR rate is then precisely controlled to the target EGR rate by feedback.
かくして、この発明により迅速に目標ＥＧＲ率への制御
が実現される。即ち、第６図で一点鎖線の目標値が急変
したとすると、この発明により実線のように迅速にＥＧ
Ｒ率を目標値に近づけることができる。従来方式では、
破線のように徐々に目標ＥＧＲ率に向かって制御される
ことになる。Thus, according to the present invention, control to the target EGR rate can be quickly realized. That is, if the target value indicated by the dashed line in Fig. 6 suddenly changes, the present invention can quickly change the EG value as indicated by the solid line.
The R rate can be brought closer to the target value. In the conventional method,
Control is gradually performed toward the target EGR rate as shown by the broken line.
第１図はこの発明の構成を示す図。
第２図はこの発明の実施例の構成を示す図。
第３図はＥＧＲ率と酸素濃度センサの出力との関係を各
吸気管圧力に対しで示すグラフ。
第４図はＥＧＲＩＩＩ？ＩＩのための制御回路の作動を
説明するフローチャート。
第５図は吸気管圧力を固定したときのＥＧＲ率と酸素濃
度センサの出力変動を説明するグラフ。
第６図は目標ＥＧＲ率が急変したときのＥＧＲ率追従特
性を従来との比較で説明する模式図。
２８・・・吸気管
３０・・・サージタンク
３２・・・スロットル弁
３６・・・排気マニホルド
４０・・・ＥＧＲ通路
４２・・・ＥＧＲ弁
５２・・・負圧制御弁
５４・・・大気圧制御弁
６０・・・制御回路
６４・・・吸気管圧力センサ
６８・・・第１１素濃度センサ
７０・・・第２酸素濃度センサ
第１図
０ １０ ２０％ＥＧＲ率
第３図
ＥＧＲ率
第５図
−−−従来
第６図FIG. 1 is a diagram showing the configuration of the present invention. FIG. 2 is a diagram showing the configuration of an embodiment of the invention. FIG. 3 is a graph showing the relationship between the EGR rate and the output of the oxygen concentration sensor for each intake pipe pressure. Is Figure 4 EGRIII? Flowchart illustrating the operation of the control circuit for II. FIG. 5 is a graph explaining the EGR rate and the output fluctuation of the oxygen concentration sensor when the intake pipe pressure is fixed. FIG. 6 is a schematic diagram illustrating EGR rate follow-up characteristics when the target EGR rate suddenly changes in comparison with a conventional one. 28... Intake pipe 30... Surge tank 32... Throttle valve 36... Exhaust manifold 40... EGR passage 42... EGR valve 52... Negative pressure control valve 54... Atmospheric pressure Control valve 60... Control circuit 64... Intake pipe pressure sensor 68... Eleventh elementary concentration sensor 70... Second oxygen concentration sensor Fig. 1 0 10 20% EGR rate Fig. 3 EGR rate No. 5 Figure --- Conventional Figure 6
Claims (1)
装置、 内燃機関の排気管から吸気管への還流排気ガスの流量を
所望排気ガス再循環率を得るため制御するための排気ガ
ス再循環弁、 排気ガス再循環装置からの還流排気ガスを含めた状態で
内燃機関への全吸入空気中の酸素濃度を検出し、これよ
りＥＧＲ率を算出するＥＧＲ率検出手段と、 エンジンの運転条件に応じたＥＧＲ率の目標値を設定す
る手段、 エンジンの運転条件に応じた排気ガス再循環弁の目標開
度を設定する手段、 ＥＧＲ率の検出値と目標値とにより、排気ガス再循環弁
の開度のフィードバック因子を算出する手段、 上記フィードバック因子によって目標開度を修正し、排
気ガス再循環弁の駆動信号を形成する手段。[Claims] An exhaust gas recirculation control device for an internal combustion engine, comprising the following components, for controlling the flow rate of recirculated exhaust gas from an exhaust pipe to an intake pipe of an internal combustion engine to obtain a desired exhaust gas recirculation rate. an exhaust gas recirculation valve, an EGR rate detection means for detecting the oxygen concentration in the total intake air to the internal combustion engine including the recirculated exhaust gas from the exhaust gas recirculation device, and calculating the EGR rate from this; Means for setting a target value of the EGR rate according to the engine operating conditions; Means for setting the target opening degree of the exhaust gas recirculation valve according to the engine operating conditions; Means for calculating a feedback factor for the opening degree of the gas recirculation valve; Means for correcting the target opening degree by the feedback factor and forming a drive signal for the exhaust gas recirculation valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61286023A JPH0819880B2 (en) | 1986-12-02 | 1986-12-02 | Exhaust gas recirculation control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61286023A JPH0819880B2 (en) | 1986-12-02 | 1986-12-02 | Exhaust gas recirculation control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63140856A true JPS63140856A (en) | 1988-06-13 |
| JPH0819880B2 JPH0819880B2 (en) | 1996-02-28 |
Family
ID=17698978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61286023A Expired - Fee Related JPH0819880B2 (en) | 1986-12-02 | 1986-12-02 | Exhaust gas recirculation control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0819880B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003516495A (en) * | 1999-12-09 | 2003-05-13 | インターナショナル エンジン インテレクチュアル プロパティー カンパニー リミテッド ライアビリティ カンパニー | Closed loop diesel engine EGR control including event monitoring |
| JP2013083207A (en) * | 2011-10-11 | 2013-05-09 | Mitsubishi Motors Corp | Engine control device |
| US20130268176A1 (en) * | 2012-04-05 | 2013-10-10 | GM Global Technology Operations LLC | Exhaust gas recirculation control systems and methods for low engine delta pressure conditions |
| US9157390B2 (en) | 2011-09-21 | 2015-10-13 | GM Global Technology Operations LLC | Selective exhaust gas recirculation diagnostic systems and methods |
| US9228524B2 (en) | 2013-08-15 | 2016-01-05 | GM Global Technology Operations LLC | Static and dynamic pressure compensation for intake oxygen sensing |
| US9249764B2 (en) | 2012-03-06 | 2016-02-02 | GM Global Technology Operations LLC | Engine control systems and methods with humidity sensors |
| US9267449B2 (en) | 2011-06-16 | 2016-02-23 | GM Global Technology Operations LLC | Control system and method for coordinating throttle and boost |
| US9341133B2 (en) | 2013-03-06 | 2016-05-17 | GM Global Technology Operations LLC | Exhaust gas recirculation control systems and methods |
| US9932917B2 (en) | 2012-03-21 | 2018-04-03 | GM Global Technology Operations LLC | Exhaust gas recirculation control systems and methods |
| US10066564B2 (en) | 2012-06-07 | 2018-09-04 | GM Global Technology Operations LLC | Humidity determination and compensation systems and methods using an intake oxygen sensor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120770A (en) * | 1982-12-28 | 1984-07-12 | Suzuki Motor Co Ltd | Egr control device of internal-combustion engine |
| JPS60138264A (en) * | 1983-12-27 | 1985-07-22 | Mitsubishi Electric Corp | Exhaust gas recirculation mechanism for engine |
| JPS62284950A (en) * | 1986-05-31 | 1987-12-10 | Mitsubishi Electric Corp | Exhaust gas reflux controller for internal combustion engine |
-
1986
- 1986-12-02 JP JP61286023A patent/JPH0819880B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59120770A (en) * | 1982-12-28 | 1984-07-12 | Suzuki Motor Co Ltd | Egr control device of internal-combustion engine |
| JPS60138264A (en) * | 1983-12-27 | 1985-07-22 | Mitsubishi Electric Corp | Exhaust gas recirculation mechanism for engine |
| JPS62284950A (en) * | 1986-05-31 | 1987-12-10 | Mitsubishi Electric Corp | Exhaust gas reflux controller for internal combustion engine |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003516495A (en) * | 1999-12-09 | 2003-05-13 | インターナショナル エンジン インテレクチュアル プロパティー カンパニー リミテッド ライアビリティ カンパニー | Closed loop diesel engine EGR control including event monitoring |
| US9267449B2 (en) | 2011-06-16 | 2016-02-23 | GM Global Technology Operations LLC | Control system and method for coordinating throttle and boost |
| US9157390B2 (en) | 2011-09-21 | 2015-10-13 | GM Global Technology Operations LLC | Selective exhaust gas recirculation diagnostic systems and methods |
| JP2013083207A (en) * | 2011-10-11 | 2013-05-09 | Mitsubishi Motors Corp | Engine control device |
| US9249764B2 (en) | 2012-03-06 | 2016-02-02 | GM Global Technology Operations LLC | Engine control systems and methods with humidity sensors |
| US9932917B2 (en) | 2012-03-21 | 2018-04-03 | GM Global Technology Operations LLC | Exhaust gas recirculation control systems and methods |
| US20130268176A1 (en) * | 2012-04-05 | 2013-10-10 | GM Global Technology Operations LLC | Exhaust gas recirculation control systems and methods for low engine delta pressure conditions |
| US10066564B2 (en) | 2012-06-07 | 2018-09-04 | GM Global Technology Operations LLC | Humidity determination and compensation systems and methods using an intake oxygen sensor |
| US9341133B2 (en) | 2013-03-06 | 2016-05-17 | GM Global Technology Operations LLC | Exhaust gas recirculation control systems and methods |
| US9228524B2 (en) | 2013-08-15 | 2016-01-05 | GM Global Technology Operations LLC | Static and dynamic pressure compensation for intake oxygen sensing |
| US9631567B2 (en) | 2013-08-15 | 2017-04-25 | GM Global Technology Operations LLC | Sensor based measurement and purge control of fuel vapors in internal combustion engines |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0819880B2 (en) | 1996-02-28 |
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