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JP2010144700A - Exhaust reflux device - Google Patents

Exhaust reflux device Download PDF

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Publication number
JP2010144700A
JP2010144700A JP2008326207A JP2008326207A JP2010144700A JP 2010144700 A JP2010144700 A JP 2010144700A JP 2008326207 A JP2008326207 A JP 2008326207A JP 2008326207 A JP2008326207 A JP 2008326207A JP 2010144700 A JP2010144700 A JP 2010144700A
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egr
pipe
exhaust
valve
flow rate
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Kenichiro Imaoka
健一郎 今岡
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UD Trucks Corp
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UD Trucks Corp
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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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an EGR device which allows more accurate measurement of an EGR amount by suppressing the influence of pulsations of intake/exhaust gases and backflow of EGR gas as much as possible. <P>SOLUTION: An EGR device consists of an EGR pipe 10 which takes a part of exhaust out of an exhaust pipe 2 in an engine E to recirculate it to an intake pipe 1, an EGR valve 11 which is included in the EGR 10 to control a flow rate of the EGR gas, a check valve 12 which is included in the EGR pipe 10 on the exhaust pipe side from the EGR valve 11 to prevent backflow in a direction toward the exhaust pipe 2 from the intake pipe 1, a flow rate sensor 13 which is included in the EGR pipe 10 between the check valve 12 and EGR valve 11 to measure a flow rate of EGR gas and a control part 14 which control an opening of the EGR valve 11 based on output of the flow rate sensor 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、エンジンの排気還流（ＥＧＲ）装置に関する。   The present invention relates to an engine exhaust gas recirculation (EGR) device.

近年のエンジンは、排気の一部を吸気系に還流させることによりＮＯｘの削減を図るべく、ＥＧＲ装置を搭載している。ＥＧＲ装置は、排気マニホールド下流の排気管から排気の一部を取り出し、吸気マニホールド上流の吸気管へ還流させるＥＧＲ管を備え、このＥＧＲ管を流れるＥＧＲガスの流量をＥＧＲ弁により制御する。すなわち、ＥＧＲ管によって還流されるＥＧＲガスの吸気に対する流量比率（ＥＧＲ率）は、エンジンの運転領域に応じて、ＥＧＲ弁の開度により制御される。例えば、負荷が低く、燃料に対する吸気流量の比率が大きい場合は、空気不足によるスモーク発生の懸念がないことから、ＮＯｘ排出量低減のため、ＥＧＲガス流量を増加させ、ＥＧＲ率を大きくする等の制御が実行される。   Recent engines are equipped with an EGR device in order to reduce NOx by returning a part of the exhaust gas to the intake system. The EGR device includes an EGR pipe that extracts a part of exhaust gas from an exhaust pipe downstream of the exhaust manifold and returns it to the intake pipe upstream of the intake manifold, and controls the flow rate of EGR gas flowing through the EGR pipe by an EGR valve. That is, the flow rate ratio (EGR rate) of the EGR gas recirculated by the EGR pipe to the intake air is controlled by the opening degree of the EGR valve in accordance with the operating range of the engine. For example, when the load is low and the ratio of the intake air flow rate to the fuel is large, there is no concern of smoke generation due to air shortage. For this reason, the EGR gas flow rate is increased and the EGR rate is increased to reduce NOx emissions. Control is executed.

ＥＧＲ管を流れるＥＧＲガスの流量（ＥＧＲ量）は、ＥＧＲ管に設けられた流量センサにより測定され、該測定値に基づいてＥＣＵ（Electronic Control Unit）がＥＧＲ弁を制御する（特許文献１参照）。
特開２００５−３３７０１１号公報 The flow rate (EGR amount) of EGR gas flowing through the EGR pipe is measured by a flow sensor provided in the EGR pipe, and an ECU (Electronic Control Unit) controls the EGR valve based on the measured value (see Patent Document 1). .
JP 2005-337011 A

ＥＧＲ量を測定する流量センサには、一般的に熱線流量計が使用される。このタイプの流量センサは、ＥＧＲ管を流れるＥＧＲガスの流れの方向を検知することができないので、排気の脈動やＥＧＲガスの逆流があったりすると、正確な流量を測定することが難しくなる。例えば、流量センサがＥＧＲ弁よりも排気管寄りに設けられていると、ＥＧＲ弁を閉じてＥＧＲを抑止しているときに、排気の脈動に影響されて流量センサが検出信号を誤発生する可能性がある。また、ＥＧＲを実行しているときでも、吸排気圧のバランスによって生じ得るＥＧＲガスの逆流を順方向の流れとして誤検出している可能性がある。   As a flow sensor for measuring the EGR amount, a hot wire flow meter is generally used. Since this type of flow rate sensor cannot detect the direction of the flow of EGR gas flowing through the EGR pipe, it is difficult to accurately measure the flow rate if there is an exhaust pulsation or a backflow of EGR gas. For example, if the flow sensor is provided closer to the exhaust pipe than the EGR valve, when the EGR valve is closed and EGR is suppressed, the flow sensor may erroneously generate a detection signal due to the exhaust pulsation. There is sex. Further, even when EGR is being executed, there is a possibility that the backflow of EGR gas that may occur due to the balance of intake and exhaust pressure is erroneously detected as a forward flow.

本発明はこのような技術背景に鑑みたもので、吸排気の脈動やＥＧＲガスの逆流による影響を極力抑え、より正確にＥＧＲ量を測定することを可能としたＥＧＲ装置を提案するものである。   The present invention has been made in view of such a technical background, and proposes an EGR device capable of measuring the amount of EGR more accurately by minimizing the effects of intake and exhaust pulsations and backflow of EGR gas as much as possible. .

本発明に係るＥＧＲ装置は、エンジンの排気管から排気の一部を取り出して吸気管へ還流させるＥＧＲ管と、該ＥＧＲ管に設けられ、ＥＧＲガスの流量を制御するＥＧＲ弁と、該ＥＧＲ弁よりも前記排気管側の前記ＥＧＲ管に設けられ、前記吸気管から前記排気管へ向かう方向の逆流を防止する逆止弁と、該逆止弁と前記ＥＧＲ弁との間の前記ＥＧＲ管に設けられ、ＥＧＲガスの流量を測定する流量センサと、該流量センサの出力に基づいて前記ＥＧＲ弁の開度を制御する制御部と、を含んで構成される。   An EGR device according to the present invention includes an EGR pipe that extracts a part of exhaust from an exhaust pipe of an engine and recirculates the exhaust gas to an intake pipe, an EGR valve that is provided in the EGR pipe and controls the flow rate of EGR gas, and the EGR valve A check valve that is provided in the EGR pipe on the exhaust pipe side to prevent backflow in the direction from the intake pipe to the exhaust pipe, and the EGR pipe between the check valve and the EGR valve. A flow rate sensor that measures the flow rate of the EGR gas, and a control unit that controls the opening of the EGR valve based on the output of the flow rate sensor.

本発明に係るＥＧＲ装置によれば、ＥＧＲ管において、流量センサよりも吸気管側にＥＧＲ弁が配設され且つ流量センサよりも排気管側に逆止弁が配設されている。したがって、ＥＧＲを行わないとき、つまりＥＧＲ弁が閉じているときには、該全閉のＥＧＲ弁によって流量センサに対する吸気の影響が排除される。且つ、排気管側に逆止弁が設けられているので、排気の脈動によるＥＧＲガスの流動が抑えられ、流量センサへの影響が抑制される。また、ＥＧＲ実行時には、排気管側の逆止弁によって流量センサ部位におけるＥＧＲガスの逆流が抑止されるので、より正確にＥＧＲ量を測定することができる。   According to the EGR device of the present invention, in the EGR pipe, the EGR valve is disposed closer to the intake pipe than the flow sensor, and the check valve is disposed closer to the exhaust pipe than the flow sensor. Therefore, when EGR is not performed, that is, when the EGR valve is closed, the influence of intake air on the flow sensor is eliminated by the fully closed EGR valve. In addition, since the check valve is provided on the exhaust pipe side, the flow of EGR gas due to exhaust pulsation is suppressed, and the influence on the flow sensor is suppressed. In addition, when EGR is performed, the backflow of EGR gas in the flow rate sensor portion is suppressed by the check valve on the exhaust pipe side, so that the EGR amount can be measured more accurately.

図１に、ＥＧＲ装置の第１実施形態を示す。第１実施形態に係るエンジンは、排気ターボ式過給器を備えた車両用エンジンである。
エンジンＥの吸気管１は、過給器ＣのコンプレッサＣ１を経て吸気マニホールドＥ１へ接続し、その途中にインタークーラー１ａが設けられている。また、エンジンＥの排気マニホールドＥ２に接続する排気管２には、過給器ＣのタービンＣ２が設けられており、該タービンＣ２からマフラーＭまで、排気管２が延設されている。 FIG. 1 shows a first embodiment of an EGR device. The engine according to the first embodiment is a vehicle engine that includes an exhaust turbocharger.
The intake pipe 1 of the engine E is connected to the intake manifold E1 via the compressor C1 of the supercharger C, and an intercooler 1a is provided in the middle thereof. The exhaust pipe 2 connected to the exhaust manifold E2 of the engine E is provided with a turbine C2 of the supercharger C. The exhaust pipe 2 extends from the turbine C2 to the muffler M.

このエンジンＥに設けられた第１実施形態のＥＧＲ装置は、タービンＣ２からマフラーＭまでの排気管２の途中に一端が接続されて排気の一部を取り出すＥＧＲ管１０を備えている。ＥＧＲ管１０は、コンプレッサＣ１より吸気上流側の吸気管１に他端が接続されてＥＧＲガスを導入する。このＥＧＲ管１０の途中に、ＥＧＲガスの流量を制御するＥＧＲ弁１１と、吸気管１から排気管２へ向かう方向のＥＧＲガス逆流を防止する逆止弁１２と、ＥＧＲガスの流量を測定する流量センサ１３と、が設けられている。   The EGR device according to the first embodiment provided in the engine E includes an EGR pipe 10 that is connected to one end of the exhaust pipe 2 from the turbine C2 to the muffler M and extracts a part of the exhaust. The other end of the EGR pipe 10 is connected to the intake pipe 1 upstream of the compressor C1 to introduce EGR gas. In the middle of the EGR pipe 10, an EGR valve 11 that controls the flow rate of EGR gas, a check valve 12 that prevents EGR gas backflow in the direction from the intake pipe 1 to the exhaust pipe 2, and the flow rate of EGR gas are measured. A flow sensor 13 is provided.

逆止弁１２は、ＥＧＲ管１０においてＥＧＲ弁１１よりも排気管２側、つまり、ＥＧＲガスの順方向流上流側に設けられている。そして、流量センサ１３は、例えば熱線式流量計で、ＥＧＲ管１０において逆止弁１２とＥＧＲ弁１１との間に設けられている。すなわち、流量センサ１３に対し、ＥＧＲガスの順方向流下流側にはＥＧＲ弁１１が設けられ且つ順方向流上流側には逆止弁１２が設けられ、両者で流量センサ１３が挟み込まれている。   The check valve 12 is provided in the EGR pipe 10 on the exhaust pipe 2 side of the EGR valve 11, that is, on the upstream side of the forward flow of EGR gas. The flow sensor 13 is, for example, a hot-wire flow meter, and is provided between the check valve 12 and the EGR valve 11 in the EGR pipe 10. That is, with respect to the flow rate sensor 13, an EGR valve 11 is provided on the downstream side of the forward flow of EGR gas, and a check valve 12 is provided on the upstream side of the forward flow, and the flow rate sensor 13 is sandwiched between the two. .

ＥＧＲ装置の制御部となるＥＣＵ（Electronic Control Unit）１４は、エンジンＥＣＵＥ３とＣＡＮ等で通信し、エンジン回転速度、負荷、車速等の情報に従いＥＧＲ実行可否を判断し、流量センサ１３の出力に基づいてＥＧＲ弁１１の開度を制御する。   An ECU (Electronic Control Unit) 14 serving as a control unit of the EGR device communicates with the engine ECU E3 by CAN or the like, determines whether or not EGR can be executed according to information such as engine rotation speed, load, and vehicle speed, and is based on the output of the flow sensor 13. Thus, the opening degree of the EGR valve 11 is controlled.

このような第１実施形態のＥＧＲ装置において、ＥＧＲ弁１１を閉じてＥＧＲを抑止している場合、流量センサ１３がＥＧＲ弁１１よりも排気管２側に設けられているので、吸気管１中の吸気の流動がＥＧＲ弁１１よりも排気管２側のＥＧＲ管１０内に伝わることがない。したがって、吸気の流動により流量センサ１３が影響を受けることはない。また、流量センサ１３よりも排気管２側に逆止弁１２が設けられているので、排気の脈動による影響も受けずに済む。すなわち、逆止弁１２が有ることにより、ＥＧＲ弁１１と逆止弁１２との間の部分のＥＧＲ管１０内圧が、逆止弁１２よりも排気管２側のＥＧＲ管１０内圧に比べて高くなるので、排気に脈動があったとしても逆止弁１２は開き難くなる。したがって、逆止弁１２とＥＧＲ弁１１との間の部分のＥＧＲ管１０内のＥＧＲガス流動が抑えられ、当該部分に設けられている流量センサ１３は影響を受け難くなる。これにより、従来に比べてより正確な測定値を得ることが可能である。   In such an EGR device of the first embodiment, when the EGR valve 11 is closed and EGR is suppressed, the flow rate sensor 13 is provided on the exhaust pipe 2 side with respect to the EGR valve 11. Is not transmitted to the EGR pipe 10 on the exhaust pipe 2 side of the EGR valve 11. Therefore, the flow sensor 13 is not affected by the flow of intake air. Further, since the check valve 12 is provided on the exhaust pipe 2 side of the flow rate sensor 13, it is not affected by the pulsation of the exhaust. In other words, the presence of the check valve 12 causes the EGR pipe 10 internal pressure in the portion between the EGR valve 11 and the check valve 12 to be higher than the EGR pipe 10 internal pressure on the exhaust pipe 2 side than the check valve 12. Therefore, even if there is a pulsation in the exhaust, the check valve 12 is difficult to open. Therefore, the EGR gas flow in the EGR pipe 10 in the portion between the check valve 12 and the EGR valve 11 is suppressed, and the flow rate sensor 13 provided in the portion is hardly affected. Thereby, it is possible to obtain a more accurate measurement value than in the past.

一方、ＥＧＲを実行している場合には、逆止弁１２の存在によって、流量センサ１２の設置部分におけるＥＧＲガスの逆流が防止されるので、より正確にＥＧＲ量を測定することができる。   On the other hand, when EGR is being executed, the presence of the check valve 12 prevents the backflow of EGR gas at the portion where the flow sensor 12 is installed, so that the EGR amount can be measured more accurately.

図２に、ＥＧＲ装置の第２実施形態を示す。この第２実施形態のエンジンも、排気ターボ式過給器を備えた、第１実施形態同様の車両用エンジンである。
第２実施形態のＥＧＲ装置において第１実施形態と相異しているのは、ＥＧＲ管１０の一端が、過給器ＣのタービンＣ２よりも排気上流側、すなわち排気マニホールドＥ２からタービンＣ２までの間の排気管２に接続されている点、及び、ＥＧＲ管１０の他端が、吸気マニホールドＥ１近傍の吸気管１に接続されている点である。排気管２において第２実施形態の位置にＥＧＲ管１０を接続することにより、より排気圧力の高い位置から排気を取り出すことができるので、ＥＧＲガスの逆流が、第１実施形態の場合に比べれば起こり難くなる。また特に、過給器Ｃを備えたエンジンＥでは、ＥＧＲ管１０において、吸気管１側の吸気圧力が排気管２側の排気圧力よりも高くなり、ＥＧＲガスが逆流し得る運転領域が存在するので、流量センサ１３よりも排気管２側に逆止弁１２を設けて逆流を阻止する効果は大きい。 FIG. 2 shows a second embodiment of the EGR device. The engine according to the second embodiment is also a vehicle engine similar to the first embodiment provided with an exhaust turbocharger.
The EGR device of the second embodiment differs from the first embodiment in that one end of the EGR pipe 10 is located upstream of the turbine C2 of the supercharger C, that is, from the exhaust manifold E2 to the turbine C2. The other end of the EGR pipe 10 is connected to the intake pipe 1 in the vicinity of the intake manifold E1. By connecting the EGR pipe 10 to the position of the second embodiment in the exhaust pipe 2, the exhaust gas can be taken out from a position where the exhaust pressure is higher, so that the backflow of EGR gas is compared to the case of the first embodiment. It becomes difficult to happen. In particular, in the engine E provided with the supercharger C, in the EGR pipe 10, there is an operating region in which the intake pressure on the intake pipe 1 side becomes higher than the exhaust pressure on the exhaust pipe 2 side and the EGR gas can flow backward. Therefore, the effect of preventing the backflow by providing the check valve 12 on the exhaust pipe 2 side than the flow rate sensor 13 is great.

図３には、ＥＧＲ装置の第３実施形態を示す。この第３実施形態のエンジンも、排気ターボ式過給器を備えた、第１実施形態同様の車両用エンジンである。
第３実施形態のＥＧＲ装置において第１実施形態と相異している点は、ＥＧＲ管１０の接続部分よりも排気下流側の排気管２に、絞り弁１５が設けられている点である。すなわち、ＥＧＲ管１０は、排気管２において過給器ＣのタービンＣ２よりも排気下流側に接続されており、該接続部分よりも排気下流側に、排気ガスの流れを絞るための絞り弁１５が介装されている。絞り弁１５は、制御部１４により開度制御され、ＥＧＲ実行時に閉の方、つまり排気流を絞る方に制御することができる。該絞り弁１５の制御により排気圧力を上げることができ、第１実施形態の場合に比べてＥＧＲガスの逆流を起こり難くすることができる。 FIG. 3 shows a third embodiment of the EGR device. The engine according to the third embodiment is also a vehicle engine similar to the first embodiment provided with an exhaust turbocharger.
The EGR device of the third embodiment differs from the first embodiment in that a throttle valve 15 is provided in the exhaust pipe 2 on the exhaust downstream side of the connection portion of the EGR pipe 10. That is, the EGR pipe 10 is connected to the exhaust gas downstream side of the turbine C2 of the supercharger C in the exhaust pipe 2, and the throttle valve 15 for restricting the flow of exhaust gas to the exhaust gas downstream side of the connecting portion. Is intervening. The opening degree of the throttle valve 15 is controlled by the control unit 14 and can be controlled to be closed when EGR is executed, that is, to throttle the exhaust flow. The exhaust pressure can be increased by controlling the throttle valve 15, and the backflow of the EGR gas can be made difficult to occur compared to the case of the first embodiment.

本発明に係るＥＧＲ装置の第１実施形態を示した図。The figure which showed 1st Embodiment of the EGR apparatus which concerns on this invention. 本発明に係るＥＧＲ装置の第２実施形態を示した図。The figure which showed 2nd Embodiment of the EGR apparatus which concerns on this invention. 本発明に係るＥＧＲ装置の第３実施形態を示した図。The figure which showed 3rd Embodiment of the EGR apparatus which concerns on this invention.

符号の説明Explanation of symbols

１ 吸気管
２ 排気管
１０ ＥＧＲ管
１１ ＥＧＲ弁
１２ 逆止弁
１３ 流量センサ
１４ 制御部
１５ 絞り弁 DESCRIPTION OF SYMBOLS 1 Intake pipe 2 Exhaust pipe 10 EGR pipe 11 EGR valve 12 Check valve 13 Flow sensor 14 Control part 15 Throttle valve

Claims (3)

エンジンの排気管から排気の一部を取り出して吸気管へ還流させるＥＧＲ管と、
該ＥＧＲ管に設けられ、ＥＧＲガスの流量を制御するＥＧＲ弁と、
該ＥＧＲ弁よりも前記排気管側の前記ＥＧＲ管に設けられ、前記吸気管から前記排気管へ向かう方向の逆流を防止する逆止弁と、
該逆止弁と前記ＥＧＲ弁との間の前記ＥＧＲ管に設けられ、ＥＧＲガスの流量を測定する流量センサと、
該流量センサの出力に基づいて前記ＥＧＲ弁の開度を制御する制御部と、
を含んで構成される排気還流装置。 An EGR pipe that extracts a part of the exhaust from the exhaust pipe of the engine and returns it to the intake pipe;
An EGR valve provided in the EGR pipe for controlling the flow rate of EGR gas;
A check valve that is provided in the EGR pipe closer to the exhaust pipe than the EGR valve and prevents a backflow in the direction from the intake pipe to the exhaust pipe;
A flow rate sensor that is provided in the EGR pipe between the check valve and the EGR valve and measures the flow rate of EGR gas;
A control unit for controlling the opening of the EGR valve based on the output of the flow sensor;
An exhaust gas recirculation device comprising: 前記排気管に排気ターボ式過給器のタービンが設けられており、
前記ＥＧＲ管は、該タービンよりも排気上流側の前記排気管に接続されている、
請求項１記載の排気還流装置。 The exhaust pipe is provided with a turbocharged turbocharger turbine,
The EGR pipe is connected to the exhaust pipe upstream of the turbine.
The exhaust gas recirculation apparatus according to claim 1. 前記排気管に排気ターボ式過給器のタービンが設けられており、
前記ＥＧＲ管は、該タービンよりも排気下流側の前記排気管に接続され、
該ＥＧＲ管接続部分よりも排気下流側の前記排気管に設けられ、前記制御部により開度制御される絞り弁をさらに含む、
請求項１記載の排気還流装置。 The exhaust pipe is provided with a turbocharged turbocharger turbine,
The EGR pipe is connected to the exhaust pipe on the exhaust downstream side of the turbine,
A throttle valve that is provided in the exhaust pipe on the exhaust downstream side of the EGR pipe connection portion and is controlled in opening by the control unit;
The exhaust gas recirculation apparatus according to claim 1.
JP2008326207A 2008-12-22 2008-12-22 Exhaust reflux device Pending JP2010144700A (en)

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