JPS5918528B2 - Secondary air supply device for exhaust turbocharged engine - Google Patents
Secondary air supply device for exhaust turbocharged engineInfo
- Publication number
- JPS5918528B2 JPS5918528B2 JP256879A JP256879A JPS5918528B2 JP S5918528 B2 JPS5918528 B2 JP S5918528B2 JP 256879 A JP256879 A JP 256879A JP 256879 A JP256879 A JP 256879A JP S5918528 B2 JPS5918528 B2 JP S5918528B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- secondary air
- engine
- air supply
- exhaust gas
- 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
【発明の詳細な説明】
本発明は、排気ガスタービンで駆動される過給機、つま
り排気ターボ過給機を備えたエンジンにおいて、その排
気系に、ＨＣ，ＣＯ等の未燃焼成分を浄化する目的で２
次空気を供給するための装置に関するものである。Detailed Description of the Invention The present invention purifies unburned components such as HC and CO in the exhaust system of an engine equipped with a supercharger driven by an exhaust gas turbine, that is, an exhaust turbo supercharger. purpose 2
The present invention relates to a device for supplying air.
＝般にエンジンの排気系に２次空気を供給する手段とし
ては、排気系における排気ガスの脈動を利用して２次空
気を自然吸入させるものと、排気系にエアポンプにて２
次空気を圧力供給するものとがあるが、排気ターボ過給
式エンジンにおいては、排気系での排気脈動は排気系に
設けた排気タービンによって低減されるから、排気脈動
によっては十分な量の２次空気を供給できず、２次空気
はエアポンプで圧力供給するようにしなければならず、
エアポンプの駆動分だけエンジン出力の損失を伴うと共
に燃費が悪くなるのである。=Generally speaking, there are two ways to supply secondary air to the engine exhaust system: one is to use the pulsation of exhaust gas in the exhaust system to naturally suck in the secondary air, and the other is to supply secondary air to the exhaust system using an air pump.
However, in exhaust turbocharged engines, the exhaust pulsation in the exhaust system is reduced by the exhaust turbine installed in the exhaust system, so depending on the exhaust pulsation, a sufficient amount of Secondary air cannot be supplied, and secondary air must be supplied under pressure using an air pump.
This results in a loss of engine output and poor fuel efficiency due to the drive of the air pump.
捷た、排気系の途中にベンチュリー等の絞り部を設は流
れによって圧力が低くなる部位を形成して２次空気を吸
引することも考えられるが、エンジンの排気ガス量はエ
ンジンの負荷に応じて大きく変化するため、前記絞り部
の口径を高負荷域の排気ガス量に合せて設定すれば、低
負荷域において所定の量の２次空気が確保できず、絞り
部の口径を低負荷域の排気ガス量に合せて設定すれば、
高負荷域において排気ガスの流れ抵抗が著しく増大し、
エンジンからの排気ガス圧力が高くなって出力ダウンに
なるばかりや、排気タービンの効率自体が低下すること
になる。It is also possible to install a restrictor such as a venturi in the middle of the exhaust system to create a part where the pressure is lowered by the flow and suck in secondary air, but the amount of exhaust gas from the engine depends on the engine load. Therefore, if the aperture of the throttle part is set to match the amount of exhaust gas in the high load range, a predetermined amount of secondary air cannot be secured in the low load range, and the aperture of the throttle part is set to match the exhaust gas volume in the low load range If you set it according to the exhaust gas amount of
Exhaust gas flow resistance increases significantly in high load ranges,
The exhaust gas pressure from the engine increases, which not only reduces the output, but also reduces the efficiency of the exhaust turbine itself.
本発明は、排気ターボ過給機の排気タービンにおいて、
その羽根車の各羽根の表側を排気ガスが流れ各羽根の裏
側には、排気ガスの流れ及び羽根車の回転によって負圧
域となる部位が在存することに鑑み、この羽根裏側に生
じる断続的な負圧域を拾って２次空気を吸引するように
したものである。The present invention provides an exhaust turbine for an exhaust turbocharger,
Exhaust gas flows on the front side of each blade of the impeller, and there is a negative pressure area on the back side of each blade due to the flow of exhaust gas and the rotation of the impeller. It is designed to pick up the negative pressure area and suck in secondary air.
次に本発明の一例を図面について説明するに、図におい
て１は吸気マニホールド２及び排気マニホールド３を有
するエンジン、４は排気タービン５とブロワ−圧縮機６
とを直結した排気ターボ過給機、７は排気ガスを大気に
放出するマフラー又は触媒コンバータを各々示し、前記
吸気マニホールド２にはエンジン１における各気筒ごと
に燃料噴射装置８を備えている。Next, an example of the present invention will be explained with reference to the drawings, in which 1 is an engine having an intake manifold 2 and an exhaust manifold 3, 4 is an exhaust turbine 5 and a blower-compressor 6.
7 indicates a muffler or a catalytic converter for discharging exhaust gas into the atmosphere, and the intake manifold 2 is provided with a fuel injection device 8 for each cylinder in the engine 1.
また、吸気マニホールド２における集合部９には、エン
ジン１への空気量を増減するためのスロットル弁１０を
備え（この場合、他の実施例にあっては燃料噴射装置に
代え集合部又はプロワ−圧縮機の吸入側に気化器を設け
ても要い）、且つ重合部は過給通路１１を介して前記プ
ロワ−圧縮機６の吐出側に接続され、プロワ−圧縮機６
の吸入側はエアフローメータ１４付き空気吸入通路１２
を介してエアクリーナー１３に接続されている。Further, the collecting part 9 of the intake manifold 2 is provided with a throttle valve 10 for increasing or decreasing the amount of air to the engine 1 (in this case, in other embodiments, the collecting part or the propeller is installed instead of the fuel injection device). (It is also necessary to provide a vaporizer on the suction side of the compressor), and the polymerization section is connected to the discharge side of the blower-compressor 6 via the supercharging passage 11,
The suction side is an air suction passage 12 with an air flow meter 14.
It is connected to the air cleaner 13 via.
また、排気タービン５の排出側は排気管１５を介してマ
フラー１に、排気タービン５０入口側は排気通路１６を
介して排気マニホールド３に各々接１”続されている。Further, the exhaust side of the exhaust turbine 5 is connected to the muffler 1 via an exhaust pipe 15, and the inlet side of the exhaust turbine 50 is connected to the exhaust manifold 3 via an exhaust passage 16.
そして、前記排気タービン５の排出側には、羽根車５′
の排出側外周部に該当する個所に、例えば軸方向に細長
いスリット又は楕円状等の羽根裏側に生じる断続的な負
圧を受は易いような形状のボー） １ ｉ負圧を受は易
い態様で設け、該ボート１７に先端が大気吸入用フィル
ター１８又は前記エアクリーナ１３に接続された２次空
気供給通路１９を接続し、この２次空気供給通路１９中
に、フィルター１８からボート１７への方向にのみ開く
ようにした逆止弁２０を設けて成るものである。An impeller 5' is provided on the exhaust side of the exhaust turbine 5.
A shape that easily receives intermittent negative pressure generated on the back side of the blade, such as an axially elongated slit or an elliptical shape, is placed on the outer periphery of the discharge side of the blade. A secondary air supply passage 19 whose tip end is connected to the air intake filter 18 or the air cleaner 13 is connected to the boat 17, and a direction from the filter 18 to the boat 17 is connected to the secondary air supply passage 19. The check valve 20 is provided with a check valve 20 that is configured to open only when.
なお、図中符号２１は過給通路１１と吸入通路１２とを
プロワ−圧縮機６を迂回して接続した吸気迂回通路で、
該通路２１には、スロット弁１０を急閉しての減速時に
開き、過給通路１１内の圧力の急上昇を防止するブロー
オフ弁２２が設けられ、また符号２３は排気通路１６と
マフラー７又は排気管１５とを排気タービン５を迂回し
て接続した排気迂回通路で、該通路２３には、過給がエ
ンジンの危険回転を越えるような過過給になったとき開
き、排気ガスを排気タービン５を迂回して直接マフラー
等へ排出してエンジンの回転数を低下させるウェストゲ
ート弁２４が設けられている。In addition, the reference numeral 21 in the figure is an intake bypass passage connecting the supercharging passage 11 and the intake passage 12 by bypassing the blower compressor 6.
The passage 21 is provided with a blow-off valve 22 that opens during deceleration by rapidly closing the slot valve 10 and prevents a sudden increase in pressure within the supercharging passage 11. Reference numeral 23 indicates a connection between the exhaust passage 16 and the muffler 7 or the exhaust gas. This is an exhaust detour passage connecting the pipe 15 to the exhaust turbine 5 by bypassing the exhaust turbine 5. The passage 23 is opened when supercharging exceeds the engine's critical speed, and the exhaust gas is transferred to the exhaust turbine 5. A wastegate valve 24 is provided to reduce the engine speed by bypassing the engine and discharging it directly to the muffler or the like.
この構成において、エンジンの運転中にエンジンから排
出された排気ガスは、排気通路１６から排気タービン５
に入り、排気タービン５を回転するから、これに直結し
たプロワ−圧縮機６は回転駆動され、エンジンへの過給
が行なわれるのである。In this configuration, exhaust gas discharged from the engine during operation of the engine is transferred from the exhaust passage 16 to the exhaust turbine 5.
Since the engine enters the engine and rotates the exhaust turbine 5, the blower compressor 6 directly connected thereto is driven to rotate, thereby supercharging the engine.
そして、排気ターヒフ５０羽根車５′における各羽根法
排気ガスが各羽根の間に入るときの衝動又は各羽根の間
から出るときの反動を受は得るように軸線に対してねじ
った形状になっており、しかも各羽根は羽根車の軸線の
回りに回転するから、各羽根の裏側には、羽根の表側に
沿う排気ガスの流れ及び羽根車の回転によって大気圧よ
シも低い負圧域ができることになり、この負圧域は羽根
車の回転によってその外周部に設けたボート１７個所に
間欠的に臨んでポート１７個所には脈動が発生し、前記
負圧域がボート１７に合致したとき換計ればボート１７
が負圧になったときのみ逆止弁２０が開いて、２次空気
を２次空気供給通路１９から吸引する作用を間欠的に繰
り返して行なうから、排気系には２次空気が遂次供給さ
れるのであり、この場合、各羽根の裏面における負圧域
の負圧値は、排気ガス量及び羽根車の回転数に略比例し
、排気ガス量及び羽根車の回転数はエンジン負荷に比例
するから、２次空気の供給量はエンジン負荷に略比例し
て増加するものである。Each vane in the exhaust turbine 50 impeller 5' has a twisted shape with respect to the axis so as to receive the impulse when the exhaust gas enters between the vanes or the reaction when it exits from between the vanes. Moreover, since each blade rotates around the axis of the impeller, a negative pressure area that is lower than atmospheric pressure is created on the back side of each blade due to the flow of exhaust gas along the front side of the blade and the rotation of the impeller. As the impeller rotates, this negative pressure area intermittently faces the 17 boats provided on the outer periphery of the impeller, causing pulsations at the 17 ports, and when the negative pressure area matches the boat 17. If you count it, boat 17
The check valve 20 opens only when the pressure becomes negative, and the action of suctioning secondary air from the secondary air supply passage 19 is repeated intermittently, so secondary air is continuously supplied to the exhaust system. In this case, the negative pressure value in the negative pressure area on the back surface of each blade is approximately proportional to the amount of exhaust gas and the rotation speed of the impeller, and the amount of exhaust gas and the rotation speed of the impeller are proportional to the engine load. Therefore, the amount of secondary air supplied increases approximately in proportion to the engine load.
従って本発明によれば、ターボ過給式エンジンの全負荷
域について所定量の２次空気を確実に供給できて、ＨＣ
，Ｃｏ等の未然焼成分を的確に浄化できるのであり、し
かも、２次空気の供給を排気タービンの出口側を利用す
るから、従来の排気系に絞シ部を設けた場合のようにエ
ンジンの排気ガス圧力の上昇によるエンジン出力の低下
、或いは従来のエアポンプ駆動によるエンジン出力の損
失を伴うことがない効果を有する。Therefore, according to the present invention, a predetermined amount of secondary air can be reliably supplied over the entire load range of a turbocharged engine, and the HC
, Co, and other unburnt components can be accurately purified. Moreover, since the outlet side of the exhaust turbine is used for supplying secondary air, it is possible to clean the engine by using a throttle section in the conventional exhaust system. This has the effect of not causing a decrease in engine output due to an increase in exhaust gas pressure or a loss in engine output due to conventional air pump drive.
第１図は本発明実施例装置の図、第２図は第１図におけ
る排気ターボ過給機の一部切欠拡大図である。
１・・・エンジン、４・・・排気ターボ過給機、６・・
・プロワ−圧縮機、５・・・排気タービン、５′・・・
羽根車、１７・・・ボート、１９・・・２次空気供給通
路、２０・・・逆止弁。FIG. 1 is a diagram of an apparatus according to an embodiment of the present invention, and FIG. 2 is a partially cutaway enlarged view of the exhaust turbo supercharger in FIG. 1. 1...Engine, 4...Exhaust turbo supercharger, 6...
・Prower compressor, 5...exhaust turbine, 5'...
Impeller, 17... Boat, 19... Secondary air supply passage, 20... Check valve.
Claims (1)
ターボ過給機における排気タービンの排出側には、当該
排気タービンにおける羽根車の排出側外周部に臨む部位
にボー）ｆ設け、該ポートに逆止弁を備えた２次空気供
給通路を接続したことを特徴とする排気ターボ過給式エ
ンジンにおける２次空気供給装置。1. In an engine equipped with an exhaust turbo supercharger, on the discharge side of the exhaust turbine in the exhaust turbo supercharger, a bow) f is provided at a portion facing the discharge side outer periphery of the impeller of the exhaust turbine, and a A secondary air supply device for an exhaust turbocharged engine, characterized in that a secondary air supply passage provided with a stop valve is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP256879A JPS5918528B2 (en) | 1979-01-11 | 1979-01-11 | Secondary air supply device for exhaust turbocharged engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP256879A JPS5918528B2 (en) | 1979-01-11 | 1979-01-11 | Secondary air supply device for exhaust turbocharged engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5593919A JPS5593919A (en) | 1980-07-16 |
| JPS5918528B2 true JPS5918528B2 (en) | 1984-04-27 |
Family
ID=11532965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP256879A Expired JPS5918528B2 (en) | 1979-01-11 | 1979-01-11 | Secondary air supply device for exhaust turbocharged engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5918528B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03110122U (en) * | 1990-02-28 | 1991-11-12 |
-
1979
- 1979-01-11 JP JP256879A patent/JPS5918528B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5593919A (en) | 1980-07-16 |
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