JPS6027776Y2 - Secondary air supply system for supercharged engines - Google Patents
Secondary air supply system for supercharged enginesInfo
- Publication number
- JPS6027776Y2 JPS6027776Y2 JP10372480U JP10372480U JPS6027776Y2 JP S6027776 Y2 JPS6027776 Y2 JP S6027776Y2 JP 10372480 U JP10372480 U JP 10372480U JP 10372480 U JP10372480 U JP 10372480U JP S6027776 Y2 JPS6027776 Y2 JP S6027776Y2
- Authority
- JP
- Japan
- Prior art keywords
- secondary air
- turbine
- air supply
- passage
- 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.)
- Expired
Links
Landscapes
- Supercharger (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【考案の詳細な説明】
(産業上の利用分野)
本考案は、排気ターボ過給機を備えたエンジンの二次空
気供給装置に関するものである。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a secondary air supply device for an engine equipped with an exhaust turbo supercharger.
(従来の技術)
従来より、エンジンの排気通路に介装されたタービンに
より吸気通路に介装されたブロアを駆動して吸気過給す
る排気ターボ過給機を備えて、エンジンの出力の向上を
図るようにすることは知られている(例えば特開昭55
−72627号公報参照)。(Prior art) Conventionally, engines have been equipped with exhaust turbo superchargers that supercharge the intake air by driving a blower installed in the intake passage with a turbine installed in the exhaust passage of the engine to improve the output of the engine. It is known to do so (for example, in JP-A-55
(Refer to Publication No.-72627).
また、従来、排気ガスの脈動を利用し、排気脈動の正圧
で閉じ負圧で開くリードバルブ等の逆止弁を、一端が大
気に開放された二次空気供給通路に介設し、該二次空気
供給通路の他端を触媒装置等の排気ガス浄化装置を介設
した排気通路に開口して、二次空気の供給により浄化性
能の向上を図るようにした二次空気供給装置も知らてい
る)例えば実開昭53−83915号公報参照)。Conventionally, a check valve such as a reed valve that utilizes the pulsation of exhaust gas and closes with the positive pressure of the exhaust pulsation and opens with the negative pressure is interposed in the secondary air supply passage whose one end is open to the atmosphere. There is also known a secondary air supply device in which the other end of the secondary air supply passage is opened to an exhaust passage in which an exhaust gas purification device such as a catalyst device is interposed to improve purification performance by supplying secondary air. For example, see Japanese Utility Model Application Publication No. 53-83915).
ところで、上記のような逆止弁式の二次空気供給装置を
上記排気ターボ過給機付エンジンに適用する場合、二次
空気供給通路をタービン下流の排気通路に開口すると、
該タービン下流の排気通路では排気脈動が弱められるた
め、リードバルブ等の逆止弁が十分に開作動せず、二次
空気の供給が十分に行われないことになる。By the way, when applying the above-described check valve type secondary air supply device to the above-mentioned engine with an exhaust turbo supercharger, if the secondary air supply passage is opened to the exhaust passage downstream of the turbine,
Since exhaust pulsation is weakened in the exhaust passage downstream of the turbine, check valves such as reed valves do not open sufficiently, resulting in insufficient supply of secondary air.
一方、上記二次空気供給通路をタービン上流の排気通路
に開口すると、該タービン上流の排気通路では排圧が全
体として高くなるため、排気脈動の負圧部分が実質的に
なくなり、二次空気の供給が行えなくなるといった問題
があった。On the other hand, when the secondary air supply passage is opened to the exhaust passage upstream of the turbine, the exhaust pressure increases as a whole in the exhaust passage upstream of the turbine, so the negative pressure part of the exhaust pulsation is substantially eliminated, and the secondary air There was a problem that supply could no longer be provided.
そのため、このような排気ターボ過給機付エンジンにお
ける逆止弁式の二次空気供給装置として、従来、特開昭
55−93919号公報に開示されるように、逆止弁を
備えた二次空気供給通路を、タービンにおける羽根車の
排出側外周部に臨む部位に開口させることにより、ター
ビンの羽根裏側に生じる断続的な負圧を拾って逆止弁を
開作動させ、二次空気を吸引するようにしたものが提案
されている。Therefore, as a check valve type secondary air supply device for such an engine with an exhaust turbo supercharger, a secondary air supply device equipped with a check valve has conventionally been used, as disclosed in Japanese Patent Application Laid-Open No. 55-93919. By opening the air supply passage in a part of the turbine facing the discharge side outer circumference of the impeller, the intermittent negative pressure generated on the back side of the turbine blade is picked up and the check valve is opened to draw in secondary air. It has been proposed to do so.
(考案が解決しようとする問題点)
しかるに、上記提案のものでは、タービンの羽根裏側に
生じる断続的な負圧を利用するものであるので、タービ
ンの羽根が多数設けられている関係上、タービンが高速
回転すると、単位時間当りの負圧と正圧との繰返しが多
くなり、その結果、逆止弁の開閉作動が追従できなくな
り、二次空気の吸引がなされなくなる恐れがある。(Problem to be solved by the invention) However, since the above proposal utilizes the intermittent negative pressure generated on the back side of the turbine blades, the turbine has a large number of blades. When the valve rotates at high speed, negative pressure and positive pressure are repeated many times per unit time, and as a result, the opening and closing operations of the check valve may not be able to follow suit, and there is a possibility that secondary air will not be sucked.
また、エンジンのアイドリング時のような低回転時には
、タービンはほとんど回転しないため、負圧の発生がほ
とんどなくなり、二次空気がほとんど吸引されないとい
う問題もある。Furthermore, when the engine is idling, at low rotation speeds, the turbine hardly rotates, so there is little generation of negative pressure, and there is also the problem that almost no secondary air is sucked in.
本考案はかかる点に鑑み、上記のような排気ターボ過給
機付エンジンにおいてはタービンの出口直下流であって
該タービンの軸延長線上近傍は常に負圧が発生すること
に着目腰この部位の排気通路に、逆止弁を介して大気に
連通ずる二次空気供給通路を開口させることにより、上
記負圧作用により逆止弁を開作動させて、二次空気の供
給をエンジンの低速から高速に亘る全運転域で十分に行
い得るようにした過給機付エンジンの二次空気供給通路
を提供することを目的とする。In view of this, the present invention focuses on the fact that negative pressure is always generated immediately downstream of the turbine exit and near the axial extension line of the turbine in the exhaust turbocharged engine as described above. By opening a secondary air supply passage that communicates with the atmosphere through a check valve in the exhaust passage, the negative pressure action causes the check valve to open, thereby changing the supply of secondary air from low engine speed to high speed. It is an object of the present invention to provide a secondary air supply passage for a supercharged engine that can be used satisfactorily over the entire operating range.
(問題点を解決するための手段)
上記の目的を達成するため、本考案の解決手段は、排気
通路に介装されたタービンにより吸気通路に介装された
ブロアを駆動して吸気過給する排気ターボ過給機を備え
る一方、上記排気通路に逆止弁を介して大気に連通ずる
二次空気供給通路を開口してなる過給機付エンジンの二
次空気供給装置において、上記二次空気供給通路を上記
タービンの出口直下流であって該タービンの軸延長線上
近傍に開口させる構成としたものである。(Means for solving the problem) In order to achieve the above object, the solution of the present invention is to supercharge the intake air by driving a blower installed in the intake passage by a turbine installed in the exhaust passage. In a secondary air supply device for a supercharged engine, which is equipped with an exhaust turbo supercharger and has a secondary air supply passage opened in the exhaust passage to communicate with the atmosphere via a check valve, the secondary air The supply passage is configured to open immediately downstream of the outlet of the turbine and near the axial extension line of the turbine.
(作 用)
上記の構成により、本考案では、タービンの回転時には
タービンの出口直下流に生じる旋回流によってタービン
の軸延長線上近傍に常に負圧が発生するので、この負圧
作用により逆止弁が開作動して二次空気が吸引されるこ
とになる。(Function) With the above configuration, in the present invention, when the turbine rotates, negative pressure is always generated near the axis extension line of the turbine due to the swirling flow that occurs immediately downstream of the turbine outlet, and this negative pressure action causes the check valve to close. opens and secondary air is sucked in.
しかも、タービンの高回転時(エンジンの高速時)には
大きな負圧が発生して逆止弁を大きく開き、多量の二次
空気が吸引される。Moreover, when the turbine rotates at high speeds (when the engine runs at high speeds), a large negative pressure is generated, which causes the check valve to open wide and a large amount of secondary air to be sucked in.
また、タービンがほとんど回転しないエンジンの低速時
には、タービンの羽根が旋回流を生じさせるような形状
であることから、該タービンの羽根の間を流通する排気
ガスが旋回流となってタービン下流に流れ、この旋回流
によりタービンの軸延長線上近傍には高速時の負圧圧よ
りは小さい負圧が発生するので、この負圧作用により逆
止弁が開いて二次空気が吸引されることになる。In addition, when the engine is running at low speed, where the turbine hardly rotates, the turbine blades are shaped to create a swirling flow, so the exhaust gas flowing between the turbine blades becomes a swirling flow and flows downstream of the turbine. This swirling flow generates a negative pressure near the axial extension line of the turbine, which is smaller than the negative pressure at high speed, and this negative pressure action opens the check valve and sucks in the secondary air.
よって、エンジンの低速から高速に亘る全運転域で二次
空気を吸引することが可能となる。Therefore, it becomes possible to suck secondary air in the entire engine operating range from low speed to high speed.
(実施例)
以下、本考案の実施例を図面に基づいて詳細に説明する
。(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.
図面において、1はエンジン、2は吸気通路、3は排気
通路、4は排気通路3に介装されたタービン5と吸気通
路2に介装されたタービン5により駆動されるブロア6
とからなる吸気過給を行う排気ターボ過給機、7はター
ビン5下流の排気通路3に介設された触媒装置である。In the drawing, 1 is an engine, 2 is an intake passage, 3 is an exhaust passage, 4 is a turbine 5 installed in the exhaust passage 3, and a blower 6 driven by the turbine 5 installed in the intake passage 2.
An exhaust turbo supercharger that performs intake supercharging consists of the following: 7 is a catalyst device installed in the exhaust passage 3 downstream of the turbine 5;
一方、8は一端がエアクリーナ9又は大気に連通されて
二次空気を排気通路3に供給する二次空気供給通路であ
って、該二次空気供給通路8の途中にはリードバルブで
構成された逆止弁10が介設されているとともに、該二
次空気供給通路8の他端8aは上記タービン5の出口直
下流であって該タービン5の軸延長線上近傍の排気通路
3に開口されており、排気通路3からの排気ガスが二次
空気供給通路8を介して逆流するのを防止するとともに
、上記タービン5の出口直下流であって該タービン5の
軸延長線上近傍に発生する負圧により逆止弁10を開作
動せしめて二次空気を排気通路3に吸引供給するように
構成されている。On the other hand, 8 is a secondary air supply passage whose one end is connected to the air cleaner 9 or the atmosphere to supply secondary air to the exhaust passage 3, and a reed valve is provided in the middle of the secondary air supply passage 8. A check valve 10 is interposed, and the other end 8a of the secondary air supply passage 8 is opened to the exhaust passage 3 immediately downstream of the outlet of the turbine 5 and near the axial extension of the turbine 5. This prevents the exhaust gas from the exhaust passage 3 from flowing backward through the secondary air supply passage 8, and also prevents the negative pressure generated immediately downstream of the outlet of the turbine 5 and near the axial extension line of the turbine 5. The check valve 10 is opened and the secondary air is sucked and supplied to the exhaust passage 3.
尚、11は吸気通路2のブロア6下流に設けたスロット
ル弁、12は吸気通路2のブロア6上流に配設したエア
フロメー、13はスロットル弁11下流の吸気通路2に
設けられ、上記エアフロメータ12の出力に応じた燃料
を吸気通路2に噴射する燃料噴射弁である。Note that 11 is a throttle valve provided downstream of the blower 6 in the intake passage 2, 12 is an air flow meter provided upstream of the blower 6 in the intake passage 2, and 13 is provided in the intake passage 2 downstream of the throttle valve 11. This is a fuel injection valve that injects fuel into the intake passage 2 according to the output of the engine.
したがって、上記実施例においては、一端が逆止弁10
を介して大気に連通ずる二次空気供給通路8の他端8a
を、排気ターボ過給機4のタービン5の出口直下流であ
って該タービン5の軸延長線上近傍の排気通路3に開口
したことにより、上記タービン5の回転時、タービン5
の出口直下流で生じる旋回流によってこの旋回中心線近
傍、すなわちタービン5の軸延長線上近傍には常に負圧
が発生し、タービン5の高回転時には大きな負圧が発生
するので、この負圧が二次空気供給通路8に作用して、
逆止弁10を開作動させることになり、二次空気供給通
路8から排気通路3に二次空気を十分に吸引供給し、タ
ービン高回転時には多量の二次空気を吸引することがで
き、触媒装置7等の排気ガス浄化性能の向上を図ること
ができる。Therefore, in the above embodiment, one end of the check valve 10
The other end 8a of the secondary air supply passage 8 communicates with the atmosphere via
is opened in the exhaust passage 3 immediately downstream of the outlet of the turbine 5 of the exhaust turbocharger 4 and near the axial extension line of the turbine 5, so that when the turbine 5 rotates, the turbine 5
Due to the swirling flow that occurs immediately downstream of the outlet of the turbine, negative pressure is always generated near the swirl center line, that is, near the axial extension line of the turbine 5, and a large negative pressure is generated when the turbine 5 rotates at high speed. Acting on the secondary air supply passage 8,
The check valve 10 is opened and a sufficient amount of secondary air is sucked and supplied from the secondary air supply passage 8 to the exhaust passage 3, and a large amount of secondary air can be sucked in when the turbine rotates at high speed. It is possible to improve the exhaust gas purification performance of the device 7 and the like.
また、タービン5がほとんど回転しないエンジン1の低
速時にも、旋回流を生じさせるような形状をしたタービ
ン5の羽根の間を排気ガスが流通するため、この排気ガ
スは旋回流となってタービン5下流に流れ、この旋回流
によりタービン5の軸延長線上近傍には高速時の負圧よ
りは小さい負圧が発生するので、この負圧作用により逆
止弁10を開いて二次空気を吸引することができる。Further, even when the engine 1 is running at low speed, where the turbine 5 hardly rotates, the exhaust gas flows between the blades of the turbine 5, which are shaped to generate a swirling flow. Flows downstream, and this swirling flow generates negative pressure near the axial extension line of the turbine 5, which is smaller than the negative pressure at high speed, and this negative pressure action opens the check valve 10 to suck in secondary air. be able to.
よって、エンジンの低速から高速に亘る全運転域で二次
空気の供給を行うことができる。Therefore, secondary air can be supplied over the entire engine operating range from low speed to high speed.
しかも、上記実施例では、エアポンプ等を要さずに、二
次空気供給通路8に逆止弁10を設けるのみで二次空気
の供給を行うことができるので、構造の簡略化を図るこ
とができるとともにコストダウン化を図ることができる
。Furthermore, in the above embodiment, the secondary air can be supplied by simply providing the check valve 10 in the secondary air supply passage 8 without requiring an air pump or the like, so that the structure can be simplified. At the same time, it is possible to reduce costs.
(考案の効果)
以上の如く、本考案によれば、排気ターボ過給機を備え
る一方、排気通路に逆止弁を介して大気に連通ずる二次
空気供給通路を開口してなる過給機付エンジンの二次空
気供給通路において、上記二次空気供給通路をタービン
の出口直下流であって該タービンの軸延長線上近傍に開
口したことにより、排気ターボ過給機に対し簡単な構造
でもって二次空気の供給をエンジンの低速から高速に亘
る全運転域で十分に行うことができるものである。(Effects of the invention) As described above, according to the invention, the turbocharger is equipped with an exhaust turbo supercharger and has a secondary air supply passage opened in the exhaust passage communicating with the atmosphere via a check valve. In the secondary air supply passage of the attached engine, by opening the secondary air supply passage directly downstream of the turbine outlet and near the axial extension line of the turbine, a simple structure can be obtained for the exhaust turbo supercharger. It is possible to sufficiently supply secondary air over the entire operating range of the engine, from low speed to high speed.
図面は本考案の実施例を例示する全体概略構成図である
。
1・・・・・・エンジン、2・・・・・・吸気通路、3
・・・・・・排気通路、4・・・・・・排気ターボ過給
機、5・・・・・・タービン、6・・・・・・フロア、
7・・・・・・触媒装置、8・・・・・・二次空気供給
通路、10・・・・・・逆止弁。The drawing is an overall schematic diagram illustrating an embodiment of the present invention. 1...Engine, 2...Intake passage, 3
... Exhaust passage, 4 ... Exhaust turbo supercharger, 5 ... Turbine, 6 ... Floor,
7... Catalyst device, 8... Secondary air supply passage, 10... Check valve.
Claims (1)
れたブロアを駆動して吸気過給する排気ターボ過給機を
備える一方、上記排気通路に逆止弁を介して大気に連通
ずる二次空気供給通路を開口してなる過給機付エンジン
の二次空気供給装置において、上記二次空気供給通路を
上記タービンの出口直下流であって該タービンの軸延長
線上近傍に開口させたことを特徴とする過給機付エンジ
ンの二次空気供給装置。It is equipped with an exhaust turbo supercharger that supercharges intake air by driving a blower installed in the intake passage by a turbine installed in the exhaust passage, and a secondary turbocharger connected to the atmosphere through a check valve in the exhaust passage. In a secondary air supply device for a supercharged engine having an air supply passage open, the secondary air supply passage is opened immediately downstream of the outlet of the turbine and near the axial extension line of the turbine. Characteristic secondary air supply system for supercharged engines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10372480U JPS6027776Y2 (en) | 1980-07-21 | 1980-07-21 | Secondary air supply system for supercharged engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10372480U JPS6027776Y2 (en) | 1980-07-21 | 1980-07-21 | Secondary air supply system for supercharged engines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5726610U JPS5726610U (en) | 1982-02-12 |
JPS6027776Y2 true JPS6027776Y2 (en) | 1985-08-22 |
Family
ID=29465107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10372480U Expired JPS6027776Y2 (en) | 1980-07-21 | 1980-07-21 | Secondary air supply system for supercharged engines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6027776Y2 (en) |
-
1980
- 1980-07-21 JP JP10372480U patent/JPS6027776Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5726610U (en) | 1982-02-12 |
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