JPH0564450U - Exhaust gas recirculation system for internal combustion engine - Google Patents

Exhaust gas recirculation system for internal combustion engine

Info

Publication number
JPH0564450U
JPH0564450U JP374192U JP374192U JPH0564450U JP H0564450 U JPH0564450 U JP H0564450U JP 374192 U JP374192 U JP 374192U JP 374192 U JP374192 U JP 374192U JP H0564450 U JPH0564450 U JP H0564450U
Authority
JP
Japan
Prior art keywords
exhaust gas
gas recirculation
pipe
catalytic converter
exhaust
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.)
Pending
Application number
JP374192U
Other languages
Japanese (ja)
Inventor
寛 ▲高▼田
洋 松田
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.)
UD Trucks Corp
Original Assignee
UD Trucks 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 UD Trucks Corp filed Critical UD Trucks Corp
Priority to JP374192U priority Critical patent/JPH0564450U/en
Publication of JPH0564450U publication Critical patent/JPH0564450U/en
Pending legal-status Critical Current

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  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

(57)【要約】 【目的】 本考案は、内燃機関の排気還流装置に関し、
アイドリング又は低負荷時のエンジンの燃焼を改善する
ことを目的とする。 【構成】 触媒コンバータが排気系に設けられ、触媒コ
ンバータ下流側から排気ガスが排気還流管を通って吸気
管に還流される内燃機関の排気ガス浄化装置において、
上記排気管の触媒コンバータ上流側に加熱ヒータを設け
ると共に、排気還流管に排気還流制御弁を設け、前記加
熱ヒータ及び排気還流制御弁にアイドリング又は低負荷
時にエンジン回転センサ及び負荷センサからの信号に基
づいてこれらを作動させる制御回路を接続した。
(57) [Abstract] [Purpose] The present invention relates to an exhaust gas recirculation system for an internal combustion engine,
The purpose is to improve engine combustion at idling or low load. In an exhaust gas purifying apparatus for an internal combustion engine, wherein a catalytic converter is provided in an exhaust system, and exhaust gas is returned from a downstream side of the catalytic converter to an intake pipe through an exhaust gas recirculation pipe,
A heater is provided on the upstream side of the catalytic converter of the exhaust pipe, and an exhaust gas recirculation control valve is provided on the exhaust gas recirculation pipe. Based on this, a control circuit for operating them was connected.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、内燃機関の排気還流装置に関する。 The present invention relates to an exhaust gas recirculation device for an internal combustion engine.

【0002】[0002]

【従来の技術】[Prior Art]

従来、内燃機関の排気還流装置は、排気ガスを、触媒コンバータが排気系に設 けられ、触媒コンバータ上流側又は下流側から排気還流管を通って吸気管に還流 させて排気ガス中に含まれるNOx(窒素酸化物)を除去している(例えば、実 開昭63−13066号公報,特開平3−33464号公報)。 Conventionally, in an exhaust gas recirculation system for an internal combustion engine, a catalytic converter is installed in an exhaust system, and exhaust gas is contained in the exhaust gas by being recirculated from an upstream side or a downstream side of the catalytic converter to an intake pipe through an exhaust gas recirculation pipe. NOx (nitrogen oxide) is removed (for example, Japanese Utility Model Laid-Open No. 63-13066 and Japanese Patent Laid-Open No. 3-33464).

【0003】 また、触媒コンバータが排気系に設けられ、触媒コンバータ上流側に、加熱ヒ ータを設けて排気ガス温度を上昇させ、触媒コンバータによる反応を促進して排 気ガスに含まれる有害成分を除去している(例えば、特開平3−31510号公 報)。Further, a catalytic converter is provided in the exhaust system, and a heating heater is provided on the upstream side of the catalytic converter to raise the temperature of the exhaust gas and accelerate the reaction by the catalytic converter to promote the harmful components contained in the exhaust gas. Are removed (for example, Japanese Patent Laid-Open No. 3-31510).

【0004】[0004]

【考案が解決しようとする課題】[Problems to be solved by the device]

上記いずれも、排気ガスに含まれる有害成分を除去することができるが、前者 の装置にあっては、排気ガスを排気還流管を通って吸気管に還流させても、アイ ドリング又は低負荷時、排気ガスを還流させて吸気温度を充分に上げることはで きず、従って、エンジン燃焼がよくない。 All of the above can remove harmful components contained in the exhaust gas.However, in the former device, even if the exhaust gas is returned to the intake pipe through the exhaust gas recirculation pipe, it can be used at idling or under low load. , It is not possible to recirculate exhaust gas to raise the intake temperature sufficiently, and therefore engine combustion is not good.

【0005】 一方、後者の装置にあっては、単に排気ガスを加熱ヒータで予熱するだけであ るから、エンジン燃焼には何ら貢献するものではない。 本考案は上記に鑑みてなされたもので、アイドリング又は低負荷時のエンジン の燃焼を改善する内燃機関の排気還流装置を提供することを目的とする。On the other hand, the latter device does not contribute to engine combustion because it simply preheats the exhaust gas with the heater. The present invention has been made in view of the above, and an object thereof is to provide an exhaust gas recirculation device for an internal combustion engine, which improves combustion of the engine at idling or at low load.

【0006】[0006]

【課題を解決するための手段】[Means for Solving the Problems]

本考案は、触媒コンバータが排気系に設けられ、触媒コンバータ下流側から排 気ガスが排気還流管を通って吸気管に還流される内燃機関の排気還流装置におい て、上記排気管の触媒コンバータ上流側に加熱ヒータを設けると共に、排気還流 管に排気還流制御弁を設け、前記加熱ヒータ及び排気還流制御弁にアイドリング 又は低負荷時にエンジン回転センサ及び負荷センサからの信号に基づいてこれら を作動させる制御回路を接続したことを特徴とする。 The present invention relates to an exhaust gas recirculation device for an internal combustion engine in which a catalytic converter is provided in an exhaust system, and exhaust gas is returned from the downstream side of the catalytic converter to an intake pipe through an exhaust gas recirculation pipe. A heater is installed on the side of the exhaust gas, an exhaust gas recirculation control valve is installed on the exhaust gas recirculation pipe, and the heating heater and the exhaust gas recirculation control valve are operated based on signals from the engine rotation sensor and the load sensor when idling or at low load. It is characterized by connecting a circuit.

【0007】[0007]

【作用】[Action]

アイドリング又は低負荷時、加熱ヒータ及び排気還流制御弁を作動させること により加熱ヒータが加熱され、排気還流制御弁が開放され、加熱ヒータの加熱及 び加熱された触媒コンバータにより温められた排気ガスが排気還流制御弁が開放 された排気還流管を通って吸気側に還流される。 When idling or at low load, the heater is heated by operating the heater and the exhaust gas recirculation control valve, the exhaust gas recirculation control valve is opened, and the exhaust gas warmed by the heating heater and the heated catalytic converter is released. The exhaust gas recirculation control valve is recirculated to the intake side through the opened exhaust gas recirculation pipe.

【0008】 従って、アイドリング又は低負荷時に、吸気が還流する排気ガスにより良好に 温められ、エンジンの燃焼が改善される。Therefore, at the time of idling or low load, the intake air is favorably warmed by the recirculating exhaust gas, and the combustion of the engine is improved.

【0009】[0009]

【実施例】【Example】

以下、本考案を図に基づいて詳細に説明する。 図1は、本考案に係る内燃機関の排気還流装置の一実施例を示したものである 。 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of an exhaust gas recirculation system for an internal combustion engine according to the present invention.

【0010】 図において、1は車両の排気管で、その途中に触媒コンバータ2が設けられ、 後端にはマフラ3が設けられている。触媒コンバータ2の上流側には、排気ガス を加熱する加熱ヒータ4が備えられている。In the figure, reference numeral 1 is an exhaust pipe of a vehicle, a catalytic converter 2 is provided in the middle thereof, and a muffler 3 is provided at a rear end thereof. A heater 4 for heating exhaust gas is provided on the upstream side of the catalytic converter 2.

【0011】 また、5は吸気管で、吸気管5と排気管1の触媒コンバータ2の下流側が排気 還流管6で連結されている。排気還流管6の吸気管5に近い所には、排気還流制 御弁7が設けられている。吸気管5の排気還流管6が連結する上流側には、アク チュエータ8の駆動によりリンク9を介して開閉される吸気絞り弁10が設けら れている。Reference numeral 5 denotes an intake pipe, and the intake pipe 5 and the exhaust pipe 1 are connected to the downstream side of the catalytic converter 2 by an exhaust gas recirculation pipe 6. An exhaust gas recirculation control valve 7 is provided near the intake gas pipe 5 of the exhaust gas recirculation pipe 6. An intake throttle valve 10 that is opened and closed via a link 9 by driving an actuator 8 is provided on the upstream side of the intake pipe 5 to which the exhaust gas recirculation pipe 6 is connected.

【0012】 11はコントロールユニットからなる制御回路で、その入力側にはエンジンE に設けられた回転センサ12と負荷センサ13が接続されている。一方、その出 力側は、前記加熱ヒータ4,排気還流制御弁7及び排気絞り弁10のアクチュエ ータ8に接続されている。そして、前記エンジンの回転センサ12及び負荷セン サ13からの信号により、アイドリング又は低負荷時、制御回路11からこれら に指令信号を送くって作動させるようになっている。Reference numeral 11 denotes a control circuit including a control unit, and a rotation sensor 12 and a load sensor 13 provided on the engine E 2 are connected to the input side of the control circuit. On the other hand, the output side thereof is connected to the heater 8, the exhaust gas recirculation control valve 7 and the actuator 8 of the exhaust throttle valve 10. Then, in response to signals from the engine rotation sensor 12 and the load sensor 13, a command signal is sent from the control circuit 11 to these when the engine is idling or a low load is operated.

【0013】 従って、エンジン駆動時に、回転センサ12及び負荷センサ13によりエンジ ンの回転及び負荷を検知して図2に示すEGR領域、即ちアイドリング又は低負 荷時の時に、制御回路11から指令信号を加熱ヒータ4,排気還流制御弁7及び 排気絞り弁10のアクチュエータ8に送り、吸気絞り弁10を閉鎖して排気還流 制御弁7を開放し、加熱ヒータ4を作動させて、排気ガスを加熱ヒータ4及び加 熱された触媒コンバータ2により温めて、図3に示すような高い排気温度になっ た排気ガスを排気還流管6を通って吸気管5側に戻し、エンジンの燃焼室で再び 燃焼させる。Therefore, when the engine is driven, the rotation sensor 12 and the load sensor 13 detect the rotation and load of the engine, and the command signal from the control circuit 11 is output from the control circuit 11 in the EGR region shown in FIG. Is sent to the heater 4, the exhaust gas recirculation control valve 7 and the actuator 8 of the exhaust gas throttle valve 10, the intake gas throttle valve 10 is closed and the exhaust gas recirculation control valve 7 is opened, and the heater 4 is operated to heat the exhaust gas. Exhaust gas that has been heated by the heater 4 and the heated catalytic converter 2 and has a high exhaust temperature as shown in FIG. 3 is returned to the intake pipe 5 side through the exhaust gas recirculation pipe 6 and is burned again in the combustion chamber of the engine. Let

【0014】 このようして、アイドリング又は低負荷時の時に、吸気側に排気温度の高い排 気ガス(EGRガス)を還流させるので、エンジンの燃焼が改善されて、図4に 示すように燃費が大幅に改善される。In this way, the exhaust gas (EGR gas) having a high exhaust temperature is recirculated to the intake side at the time of idling or low load, so that the combustion of the engine is improved and the fuel consumption is reduced as shown in FIG. Is greatly improved.

【0015】 なお、上記実施例において、吸気絞り弁10がなくも、排気ガスが吸気側に戻 されて、吸気と共にエンジンE側に流れるので、吸気絞り弁10は、必ずしも必 要ではない。In the above embodiment, the intake throttle valve 10 is not always necessary because the exhaust gas is returned to the intake side and flows with the intake air to the engine E side without the intake throttle valve 10.

【0016】[0016]

【考案の効果】[Effect of the device]

以上説明したように本考案は、アイドリング又は低負荷時のエンジンの燃焼が 改善され、燃費が大幅に改善される。 As described above, according to the present invention, combustion of the engine at idling or low load is improved, and fuel consumption is significantly improved.

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

【図1】本考案の一実施例の構成図である。FIG. 1 is a block diagram of an embodiment of the present invention.

【図2】本考案の一実施例の排気ガス還流(EGR)領
域図である。
FIG. 2 is an exhaust gas recirculation (EGR) region diagram of one embodiment of the present invention.

【図3】排気温度とエンジン負荷の関係を示す図であ
る。
FIG. 3 is a diagram showing a relationship between an exhaust temperature and an engine load.

【図4】燃費改善率とエンジン負荷の関係を示す図であ
る。
FIG. 4 is a diagram showing a relationship between a fuel efficiency improvement rate and an engine load.

【符号の説明】[Explanation of symbols]

1 排気管 2 触媒コンバータ 4 加熱ヒータ 6 排気還流管 7 排気還流制御弁 11 コントロールユニット(制御回路) 12 回転センサ 13 負荷センサ 1 Exhaust Pipe 2 Catalytic Converter 4 Heater 6 Exhaust Gas Recirculation Pipe 7 Exhaust Gas Recirculation Control Valve 11 Control Unit (Control Circuit) 12 Rotation Sensor 13 Load Sensor

フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 F02M 25/07 580 F 8923−3G Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI technical display location F02M 25/07 580 F 8923-3G

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 触媒コンバータが排気系に設けられ、触
媒コンバータ下流側から排気ガスが排気還流管を通って
吸気管に還流される内燃機関の排気還流装置において、
上記排気管の触媒コンバータ上流側に加熱ヒータを設け
ると共に、排気還流管に排気還流制御弁を設け、前記加
熱ヒータ及び排気還流制御弁にアイドリング又は低負荷
時にエンジン回転センサ及び負荷センサからの信号に基
づいてこれらを作動させる制御回路を接続したことを特
徴とする内燃機関の排気還流装置。
1. An exhaust gas recirculation device for an internal combustion engine, wherein a catalytic converter is provided in an exhaust system, and exhaust gas is returned from a downstream side of the catalytic converter to an intake pipe through an exhaust gas recirculation pipe.
A heater is provided on the upstream side of the catalytic converter of the exhaust pipe, and an exhaust gas recirculation control valve is provided on the exhaust gas recirculation pipe. An exhaust gas recirculation system for an internal combustion engine, characterized in that a control circuit for activating them is connected.
JP374192U 1992-02-04 1992-02-04 Exhaust gas recirculation system for internal combustion engine Pending JPH0564450U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP374192U JPH0564450U (en) 1992-02-04 1992-02-04 Exhaust gas recirculation system for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP374192U JPH0564450U (en) 1992-02-04 1992-02-04 Exhaust gas recirculation system for internal combustion engine

Publications (1)

Publication Number Publication Date
JPH0564450U true JPH0564450U (en) 1993-08-27

Family

ID=11565641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP374192U Pending JPH0564450U (en) 1992-02-04 1992-02-04 Exhaust gas recirculation system for internal combustion engine

Country Status (1)

Country Link
JP (1) JPH0564450U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014517191A (en) * 2011-05-02 2014-07-17 ボルボ テクノロジー コーポレイション Method and internal combustion engine system for keeping an exhaust gas aftertreatment system within an operating temperature range

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014517191A (en) * 2011-05-02 2014-07-17 ボルボ テクノロジー コーポレイション Method and internal combustion engine system for keeping an exhaust gas aftertreatment system within an operating temperature range

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