JPS63255518A - Engine with supercharger - Google Patents

Engine with supercharger

Info

Publication number
JPS63255518A
JPS63255518A JP8901887A JP8901887A JPS63255518A JP S63255518 A JPS63255518 A JP S63255518A JP 8901887 A JP8901887 A JP 8901887A JP 8901887 A JP8901887 A JP 8901887A JP S63255518 A JPS63255518 A JP S63255518A
Authority
JP
Japan
Prior art keywords
pressure
working chamber
supercharger
engine
intake air
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
JP8901887A
Other languages
Japanese (ja)
Inventor
Haruo Okimoto
沖本 晴男
Seiji Tajima
誠司 田島
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor 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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP8901887A priority Critical patent/JPS63255518A/en
Publication of JPS63255518A publication Critical patent/JPS63255518A/en
Pending legal-status Critical Current

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  • Supercharger (AREA)

Abstract

PURPOSE:To enhance the charging efficiency by connecting a working chamber and an intake air passage of an engine, when a discharge opening of a supercharger is opened, by means of a pressure conduit equipped with a partitioning wall that is vibrated by a pressure-change in the working chamber, thereby generating the pulsation of the intake air. CONSTITUTION:A vibrating plate 10 of the diaphragm type is attached to the wall of a volume part 9, thereby forming a partitioning wall. A pressure chamber 11 located behind the plate 10 is connected with a pressure conduit 12 that transfers the pressure change in the working chamber 8a of an air pump 8. The pressure conduit 12 is branched into two branch conduits 12a and 12b, which are opened to the working chamber 8a, respectively, in the vicinity of both sides of a discharge opening 8b of an air pump 8, via a switching valve 13. The pressure of the air, which entered the working chamber 8a from an intake air opening 8e, stays at the atmospheric pressure while the discharge opening 8b is closed, but it suddenly rises up to the supercharging pressure as soon as the discharge opening begins to open. This change in the pressure produces pressure waves in pressure conduits 12, 12a, and 12b, thereby vibrating the vibrating plate 10. As a result, pulsation of intake air is produced in the intake air passage 3.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、容積型エアポンプを過給機として備えた過給
機付エンジンに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a supercharged engine equipped with a positive displacement air pump as a supercharger.

(従来技術) エンジンの充填効率を向上させるために吸気系に設けら
れる機械式過給機として、作動室の容積によって定まる
量の空気を強制的に送り出すいわゆる容積型のエアポン
プを利用したものが知られており、その代表的なものと
しては、例えば実開昭59−111928号公報に記載
されているようなルーツブロワタイプの過給機があるが
、このような容積型過給機の場合、例えばルーツポンプ
の作動室内の圧力は、ポンプ内部での圧縮が行われない
ことから吐出口が開くまでは吸入口上流側の圧力つまり
大気圧のままであり、吐出口が開いた時に下流の加圧さ
れた空気が逆流することによって大気圧から過給圧に急
変するので、吐出口が開く瞬間の狭いクリアランスを空
気が逆流するときに気流音が発生し、また吐出脈動や吸
入脈動による脈動音が発生するなど、騒音の面で問題が
ある。
(Prior art) A known mechanical supercharger installed in the intake system to improve engine filling efficiency uses a so-called positive displacement air pump that forcibly sends out an amount of air determined by the volume of the working chamber. A representative example of this is a roots blower type supercharger as described in Japanese Utility Model Application Publication No. 59-111928. The pressure in the working chamber of the Roots pump remains at the upstream side of the suction port, that is, atmospheric pressure, until the discharge port opens because there is no compression inside the pump, and when the discharge port opens, the pressure in the downstream increases. The reverse flow of the air causes a sudden change from atmospheric pressure to supercharging pressure, which causes airflow noise when the air flows backward through the narrow clearance at the moment the discharge port opens, and pulsation noise due to discharge pulsation and suction pulsation. There are problems in terms of noise.

ところで、このような容積型のエアポンプのポンプ作用
のみで所要の充填量を確保しようとすると、どうしても
ポンプ容量を大きくせざるを得ないし、また、ポンプに
かかる負荷も大きくなる。
By the way, if you try to secure the required filling amount only by the pumping action of such a positive displacement air pump, you will inevitably have to increase the pump capacity and the load on the pump will also increase.

しかるに、容積型過給機を備えた従来のエンジンでは、
その特徴の一つである作動室内の圧力変動が、上記のよ
うに騒音の原因としてマイナスに作用することはあって
も、充填効率向上や負荷低減という面では何ら寄与する
ところがなかった。
However, in a conventional engine with a positive displacement supercharger,
Although pressure fluctuations in the working chamber, which is one of its characteristics, may have a negative effect as a cause of noise as described above, it has not contributed in any way to improving filling efficiency or reducing load.

(発明の目的) 本発明は上記問題点に鑑みてなされたものであって、容
積型エアポンプを過給機とする過給機付エンジンにおい
て、過給機の作動室内の圧力変動を利用して充填効率を
さらに向上させることを目的とする。
(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and is a supercharged engine using a positive displacement air pump as a supercharger. The aim is to further improve filling efficiency.

(発明の構成) 本発明は、過給機の作動室内の圧力変動を利用して吸気
に所定の脈動を発生させることにより、エンジンの充填
効率を向上させることができるという知見に基づくもの
であって、その構成はつぎのとおりである。すなわち、
本発明に係る過給機付エンジンは、非圧縮式容積型エア
ポンプを過給機とする過給機付エンジンにおいて、過給
機の吐出口が開いたときの作動室とエンジンの吸気通路
とを、作動室の圧力変動によって振動する隔壁を備えた
圧力導管によって接続したことを特徴とするものである
(Structure of the Invention) The present invention is based on the knowledge that engine charging efficiency can be improved by generating a predetermined pulsation in the intake air using pressure fluctuations in the working chamber of a supercharger. Its structure is as follows. That is,
A supercharged engine according to the present invention is a supercharged engine using a non-compressible positive displacement air pump as a supercharger, and the working chamber and the intake passage of the engine when the discharge port of the supercharger is opened. , is characterized in that it is connected by a pressure conduit with a partition wall that vibrates due to pressure fluctuations in the working chamber.

(作用) エンジンか作動して過給機が駆動されると、吸入空気は
過給機によって強制的に下流側吸気通路に送り込まれエ
ンジンの燃焼室内に吸入される。
(Operation) When the engine operates and the supercharger is driven, intake air is forcibly sent into the downstream intake passage by the supercharger and sucked into the combustion chamber of the engine.

過給機の作動室内の圧力は吐出口開時を境にして急激に
変動し、この圧力変動によって圧力導管内に圧力波が発
生ずる。そして、この圧力波が隔壁によって増幅されて
吸気を加振し、吸気に脈動を発生させる。この脈動がエ
ンジンの吸気タイミングあるいは過給機の吸入・吐出の
タイミングに対し適切な位相関係になるように設定され
ることにより、エンジンへの吸入空気の流入量、過給機
の吐出量が増大する。
The pressure in the working chamber of the supercharger fluctuates rapidly when the discharge port opens, and this pressure fluctuation generates pressure waves in the pressure conduit. This pressure wave is then amplified by the partition wall and excites the intake air, causing pulsations in the intake air. By setting this pulsation to have an appropriate phase relationship with the engine's intake timing or the turbocharger's intake/discharge timing, the amount of intake air flowing into the engine and the amount of discharge from the supercharger increases. do.

(実施例) 以下、本発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.

第1図は過給機の作動室の圧力変動によって振動する隔
壁を備えた圧力導管を過給機下流の吸気通路に接続する
ようにした本発明の第1の実施例を示している。
FIG. 1 shows a first embodiment of the invention in which a pressure conduit with a partition wall that vibrates due to pressure fluctuations in the working chamber of the supercharger is connected to an intake passage downstream of the supercharger.

同図に示すように、エンジン1の燃焼室2に開ロする吸
気通路3および排気通路4は、吸気弁5および排気弁6
によりそれぞれエンジンのサイクルに同期して開閉され
る。エアクリーナ7から吸気通路3に流入する燃焼用空
気は、途中、ルーツブロワタイプのエアポンプ8によっ
て強制的に吸気通路3下流側に送り込まれる。エアポン
プ8下流の吸気通路3にはボリューム部9が設けられ、
該ボリューム部9には、過給圧が所定値以上になると開
いて加圧空気を上流側吸気通路3ヘリークさせるリーク
弁が設けられている。
As shown in the figure, an intake passage 3 and an exhaust passage 4 that open into the combustion chamber 2 of the engine 1 are connected to an intake valve 5 and an exhaust valve 6.
The valves are opened and closed in synchronization with the engine cycle. Combustion air flowing into the intake passage 3 from the air cleaner 7 is forcibly sent to the downstream side of the intake passage 3 by a Roots blower type air pump 8 on the way. A volume portion 9 is provided in the intake passage 3 downstream of the air pump 8,
The volume portion 9 is provided with a leak valve that opens when the boost pressure exceeds a predetermined value to leak pressurized air to the upstream intake passage 3.

ボリューム部9の壁部にはダイアフラム式の振動板10
が装着されて隔壁を形成し、その背部の圧力室11には
、エアポンプ8の作動室8aの圧力変動を伝える圧力導
管12が接続されている。
A diaphragm-type diaphragm 10 is mounted on the wall of the volume section 9.
is attached to form a partition wall, and a pressure chamber 11 at the back thereof is connected to a pressure conduit 12 that transmits pressure fluctuations in the working chamber 8a of the air pump 8.

圧力導管12は切換弁13を介して2本12a。Two pressure pipes 12a are connected to each other via a switching valve 13.

+2bに別れ、エアポンプ8の吐出口8bの両側近傍位
置で作動室8aにそれぞれ開口している。
+2b, and open into the working chamber 8a at positions near both sides of the discharge port 8b of the air pump 8.

振動板10の背面には圧縮ばねが介設されている。A compression spring is provided on the back surface of the diaphragm 10.

ロータ8c、8dの回転により吸入口8eから作動室8
aに入った空気は、吐出口8bが開くまで一4= は大気圧で、吐出口8bが開き始めると急激に過給圧に
まで」1昇する。そして、この圧力変動が圧力導管12
.12a、12b内に圧力波を発生させ、振動板10を
振動させて吸気通路3内に吸気脈動を発生させる。この
振動板IOによって発生する脈動の周期あるいは位相は
、圧力導管12゜12a、12bの径や長さ、それに圧
縮ばねのばね定数や振動板10の重量等の設定によって
変えることができるので、この脈動の周期を、エンジン
の所定の回転数領域においてエンジン吸入周期と同期さ
せ、しかも、吸気弁の開閉によって生ずる吸気通路内の
通常の脈動と共振して吸入行程の終りに高い正圧を吸気
ボートに伝え4ように設定することによって、所定の回
転数領域において充填効率を向上させ、出力を高めるこ
とができる。
Due to the rotation of the rotors 8c and 8d, the working chamber 8 is
The air entering a is at atmospheric pressure until the discharge port 8b opens, and when the discharge port 8b begins to open, it rapidly rises to supercharging pressure. This pressure fluctuation causes pressure conduit 12
.. Pressure waves are generated within 12a and 12b, vibrating the diaphragm 10, and generating intake pulsation within the intake passage 3. The period or phase of the pulsation generated by this diaphragm IO can be changed by setting the diameter and length of the pressure conduits 12° 12a, 12b, the spring constant of the compression spring, the weight of the diaphragm 10, etc. The pulsation cycle is synchronized with the engine intake cycle in a predetermined engine speed range, and the intake boat generates high positive pressure at the end of the intake stroke by resonating with the normal pulsation in the intake passage caused by the opening and closing of the intake valve. By setting the speed to 4, it is possible to improve the filling efficiency and increase the output in a predetermined rotational speed range.

また、圧力導管12は上記のように切換弁13の」1流
で2系統に別れ、別々の作動室8a、8bの圧力変動を
切り換えて導くようにされているので、振動板lOの位
相を選択的に切り換えることができ、したがって、広い
回転数範囲で充填効率を向」ニさせることができる。ま
た、このように、本来過給作用に寄与しない過給機内の
圧力変動を充填効率向上のために活用することができる
ので、その分たけ過給機の負荷が低減される。しかも、
このような圧力導管12.12a、+2bを設けること
で過給機内の圧力変化がゆるやかになり、吐出音の低減
ができる。
In addition, as mentioned above, the pressure conduit 12 is divided into two systems with one flow of the switching valve 13, and the pressure fluctuations in the separate working chambers 8a and 8b are switched and guided, so that the phase of the diaphragm lO can be adjusted. It can be switched selectively and thus the filling efficiency can be optimized over a wide rotational speed range. Furthermore, in this way, pressure fluctuations within the supercharger that do not originally contribute to supercharging can be utilized to improve charging efficiency, so the load on the supercharger is reduced accordingly. Moreover,
By providing such pressure conduits 12.12a and +2b, pressure changes within the supercharger become gentler and discharge noise can be reduced.

つぎに、本発明の第2の実施例を第2図によって説明す
る。
Next, a second embodiment of the present invention will be described with reference to FIG.

この実施例は、前記第1の実施例と同様の圧力導管を過
給機」1流の吸気通路に接続したものである。第1図と
共通する部分については同一の符号を付すにとどめて詳
細な説明を一部省略し、以下、この実施例に特有な点を
中心に説明する。
In this embodiment, a pressure conduit similar to that of the first embodiment is connected to the intake passage of the supercharger. Components common to those in FIG. 1 are designated by the same reference numerals, and detailed explanations are partially omitted, and the following will focus on the points unique to this embodiment.

この実施例では、第2図に示すように、エアポンプ8の
上流側に拡大部14が形成され、その壁面に振動板10
が装着されている。そして、振動板10背部の圧力室1
1に2本の圧力導管12a。
In this embodiment, as shown in FIG.
is installed. Then, the pressure chamber 1 at the back of the diaphragm 10
1 has two pressure conduits 12a.

+2bが別々に連通している。また、各圧力導管12a
、+2bの途中には、それぞれ切換弁13λ、13bが
介設されている。
+2b are communicated separately. In addition, each pressure conduit 12a
, +2b are provided with switching valves 13λ and 13b, respectively.

振動板IOは、前記第1の実施例の場合と同様に作動室
8a内の圧力変動によって振動し、過給機8上流の吸気
通路に脈動を発生させる。この脈動の周期をエアポンプ
8の吸入周期と同期させ、しかも、吸入時に正の圧力波
が来るよう設定することによってエアポンプ8自体の充
填量が増大し、それによってエンジンの充填効率が上が
り出力が高まる。またそれによってエアポンプ8の負荷
が低減する。さらに、吐出口8bが開いた瞬間の吹きも
どしが弱くなって気流音が低減する。
The diaphragm IO vibrates due to pressure fluctuations in the working chamber 8a, as in the first embodiment, and generates pulsations in the intake passage upstream of the supercharger 8. By synchronizing the period of this pulsation with the suction period of the air pump 8 and setting it so that a positive pressure wave occurs during suction, the filling amount of the air pump 8 itself increases, thereby increasing the filling efficiency of the engine and increasing the output. . This also reduces the load on the air pump 8. Furthermore, the blowback at the moment when the discharge port 8b opens becomes weaker, and air flow noise is reduced.

さらに、本発明の第3の実施例を第3図によって説明す
る。
Furthermore, a third embodiment of the present invention will be explained with reference to FIG.

この実施例は、自然吸気通路と過給通路とを備え、吸気
行程の後半に過給通路から過給エアを押し込むことによ
って所定の運転領域で充填効率を高めるようにしたロー
クリピストンエンジンに適用されたものである。この実
施例についても、前記両実施例との共通部分については
同一の符号を付すにとどめて詳細な説明を一部省略する
This embodiment is applied to a low-replacement piston engine that is equipped with a natural intake passage and a supercharging passage, and is designed to increase charging efficiency in a predetermined operating range by pushing supercharging air from the supercharging passage in the latter half of the intake stroke. It is what was done. In this embodiment as well, the same reference numerals are given to the parts common to both the embodiments described above, and a detailed explanation thereof will be partially omitted.

この種の部分過給式エンジンIは、自然吸気通路3aと
、過給機8を備えた過給通路3bが設けられ、過給通路
3b側はロータリバルブ15により吸気行程の後半に開
かれるが、自然吸気側と過給側がオーバラップする期間
があるので、このオーバラップ期間中に過給エアが自然
吸気側に一部吹き抜けて充填量が下がったり、また吹き
返し音が発生ずるといった問題があったが、この実施例
では、前記第1および第2の両実施例と同様にエアポン
プ8の作動室8aの圧力変動によって振動する振動板1
0が自然吸気通路3aのポリコーム部9壁面に設けられ
ているので、振動板10によって強化された形の自然吸
気側の脈動がオーバラップ時期に丁度正圧となって作用
するよう設定することにより、自然吸気側からの吸気量
を増大させ、吹き返し量を低減して出力を高め、また、
吹き返し音を低減することができる。
This type of partially supercharged engine I is provided with a natural intake passage 3a and a supercharging passage 3b equipped with a supercharger 8, and the supercharging passage 3b side is opened by a rotary valve 15 in the latter half of the intake stroke. Since there is a period when the naturally aspirated side and the supercharged side overlap, there are problems such as part of the supercharged air blowing through to the naturally aspirated side during this overlap period, reducing the charging amount and causing blowback noise. However, in this embodiment, as in both the first and second embodiments, the diaphragm 1 vibrates due to pressure fluctuations in the working chamber 8a of the air pump 8.
0 is provided on the wall surface of the polycomb portion 9 of the natural intake passage 3a, so by setting it so that the pulsation on the naturally intake side strengthened by the diaphragm 10 acts as a positive pressure at the overlap period. , increases the amount of intake air from the naturally aspirated side, reduces the amount of blowback, and increases the output.
The blowback sound can be reduced.

なお、第3図には図示していないが、この第3の実施例
においても、2本の圧力導管+2a、12bには、前記
第2の実施例と同様に、それぞれ切換弁が設けられる。
Although not shown in FIG. 3, in this third embodiment, the two pressure conduits +2a and 12b are each provided with a switching valve, as in the second embodiment.

第2および第3の実施例では、これら2つの切換弁の開
閉によって前記第1の実施例と同様の位相の切り換えを
行っている。
In the second and third embodiments, the same phase switching as in the first embodiment is performed by opening and closing these two switching valves.

第1の実施例では圧力導管12を切換弁13のところで
2本に分岐させており、また、第2および第3の実施例
では、2本の圧力導管+2a、12bを別々に圧力室1
1に連通させているが、これら圧力導管の構成は適宜入
れ替えて用いることができる。
In the first embodiment, the pressure conduit 12 is branched into two at the switching valve 13, and in the second and third embodiments, the two pressure conduits +2a and 12b are separately connected to the pressure chamber 1.
1, the configurations of these pressure conduits can be changed as appropriate.

ところで、上記第1の実施例では、振動板の振動による
脈動の正の圧力波がエンジン吸入行程に同期するように
設定しているが、振動板の振動の周期あるいは位相をエ
アポンプの吐出周期あるいは吐出時期とずらした形に設
定すれば、エアポンプの吐出脈動が減衰して騒音が低減
する。一方、」−記第2の実施例では、振動板の振動に
よる脈動の正の圧力波がエアポンプの吸入時期と同期す
るよう設定されているか、振動板の振動の周期あるいは
位相をエアポンプの吸入周期あるいは吸入時期とずらし
た形に設定すれば、エアポンプの吸入脈動が減衰して騒
音が低減する。
By the way, in the first embodiment, the pulsating positive pressure waves caused by the vibration of the diaphragm are set to be synchronized with the engine intake stroke, but the period or phase of the vibration of the diaphragm is set to be different from the discharge period of the air pump or the If the discharge timing is set to be different from the discharge timing, the discharge pulsation of the air pump will be attenuated and the noise will be reduced. On the other hand, in the second embodiment, the pulsating positive pressure waves caused by the vibration of the diaphragm are set to be synchronized with the suction timing of the air pump, or the period or phase of the vibration of the diaphragm is set to be the same as the suction period of the air pump. Alternatively, if the timing is set to be different from the suction timing, the suction pulsation of the air pump will be attenuated and the noise will be reduced.

本発明は、上記実施例に限定されず、その他いろいろな
態様で実施することができる。
The present invention is not limited to the above embodiments, and can be implemented in various other ways.

(発明の効果) 本発明は以上のように構成されているので、過給機の作
動室内に生ずる圧力変動を活用してエンジンの充填効率
を向上させ出力を高めることができる。
(Effects of the Invention) Since the present invention is configured as described above, it is possible to improve the charging efficiency of the engine and increase the output by utilizing pressure fluctuations occurring in the working chamber of the supercharger.

4、発明の詳細な説明 第1図は本発明の第1の実施例を示す全体図、第2図は
本発明の第2の実施例を示す全体図、第3図は本発明の
第3の実施例を示す全体図である。
4. Detailed Description of the Invention Fig. 1 is an overall view showing a first embodiment of the invention, Fig. 2 is an overall view showing a second embodiment of the invention, and Fig. 3 is an overall view showing a third embodiment of the invention. FIG.

1:エンジン、3・吸気通路、8 エアポンプ、lO:
振動板、12.12a、12b:圧力導管。
1: Engine, 3. Intake passage, 8 Air pump, lO:
Diaphragm, 12.12a, 12b: pressure conduit.

Claims (1)

【特許請求の範囲】[Claims] (1)非圧縮式容積型エアポンプを過給機とする過給機
付エンジンにおいて、過給機の吐出口が開いたときの作
動室とエンジンの吸気通路とを、作動室の圧力変動によ
って振動する隔壁を備えた圧力導管によって接続したこ
とを特徴とする過給機付エンジン。
(1) In a supercharged engine using a non-compressible positive displacement air pump as a supercharger, when the discharge port of the supercharger opens, the working chamber and the engine intake passage vibrate due to pressure fluctuations in the working chamber. A supercharged engine characterized in that the supercharged engine is connected by a pressure conduit having a bulkhead.
JP8901887A 1987-04-10 1987-04-10 Engine with supercharger Pending JPS63255518A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8901887A JPS63255518A (en) 1987-04-10 1987-04-10 Engine with supercharger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8901887A JPS63255518A (en) 1987-04-10 1987-04-10 Engine with supercharger

Publications (1)

Publication Number Publication Date
JPS63255518A true JPS63255518A (en) 1988-10-21

Family

ID=13959166

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8901887A Pending JPS63255518A (en) 1987-04-10 1987-04-10 Engine with supercharger

Country Status (1)

Country Link
JP (1) JPS63255518A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170107921A1 (en) * 2015-10-19 2017-04-20 GM Global Technology Operations LLC External Vehicle Sound Field Enhancement
US10294878B2 (en) 2016-02-24 2019-05-21 GM Global Technology Operations LLC Wastegate control systems and methods for engine sound emission

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170107921A1 (en) * 2015-10-19 2017-04-20 GM Global Technology Operations LLC External Vehicle Sound Field Enhancement
US9828921B2 (en) * 2015-10-19 2017-11-28 GM Global Technology Operations LLC External vehicle sound field enhancement
US10294878B2 (en) 2016-02-24 2019-05-21 GM Global Technology Operations LLC Wastegate control systems and methods for engine sound emission

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