JPH0143509Y2 - - Google Patents
Info
- Publication number
- JPH0143509Y2 JPH0143509Y2 JP1981194973U JP19497381U JPH0143509Y2 JP H0143509 Y2 JPH0143509 Y2 JP H0143509Y2 JP 1981194973 U JP1981194973 U JP 1981194973U JP 19497381 U JP19497381 U JP 19497381U JP H0143509 Y2 JPH0143509 Y2 JP H0143509Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- auxiliary
- injection valve
- engine
- auxiliary fuel
- 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
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- Combustion Methods Of Internal-Combustion Engines (AREA)
- High-Pressure Fuel Injection Pump Control (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【考案の詳細な説明】
本考案は燃焼室内に出力用燃料を噴射供給する
主燃料噴射弁の他に、フユーミゲーシヨン或いは
パイロツト噴射等出力用燃料噴射に先立つて補助
燃料を供給し、出力用燃料の着火性を助ける補助
燃料供給装置を備えたデイーゼルエンジンにおい
て、前記補助燃料供給装置を制御してエンジン騒
音の音低減を図つた装置に関する。[Detailed explanation of the invention] In addition to the main fuel injection valve that injects and supplies output fuel into the combustion chamber, the invention supplies auxiliary fuel prior to output fuel injection such as fumigation or pilot injection, and The present invention relates to a device for reducing engine noise by controlling the auxiliary fuel supply device in a diesel engine equipped with an auxiliary fuel supply device that helps the ignitability of fuel for use.
主燃料噴射弁から燃焼室内に出力用燃料を噴射
し、これを着火燃焼するに先立つて、燃焼室内に
補助燃料を予め供給し出力用燃料の着火性を良好
にする手段が知られている。即ち、フユーミゲー
シヨンやパイロツト噴射にあつては前記主燃料噴
射に先立つて補助燃料を微量噴射供給し、もつて
圧縮行程において更に燃料が噴射供給された場合
に着火し易い雰囲気に燃焼室内を維持しておく。
このような雰囲気に出力用燃料が噴射されると着
火遅れが極めて短かくなり、圧力上昇率を低減
し、もつてエンジン騒音を低下することが知られ
ている。 BACKGROUND ART There is a known method for improving the ignitability of the output fuel by injecting the output fuel into the combustion chamber from the main fuel injection valve and supplying auxiliary fuel into the combustion chamber before igniting and combusting the output fuel. In other words, in the case of fumigation or pilot injection, a small amount of auxiliary fuel is injected and supplied prior to the main fuel injection, thereby creating an atmosphere in the combustion chamber that is likely to cause ignition when additional fuel is injected during the compression stroke. Keep it.
It is known that when output fuel is injected into such an atmosphere, the ignition delay becomes extremely short, the rate of pressure rise is reduced, and engine noise is reduced.
一方、フユーミゲーシヨン、パイロツト噴射等
により噴射された燃料の一部は出力に供し得ず、
燃費が悪化する傾向にある。 On the other hand, some of the fuel injected by fumigation, pilot injection, etc. cannot be used for output,
Fuel efficiency tends to worsen.
ところで、自動車等の車両や第１図に示す如く
燃料噴射量が所定値以上になると急激にエンジン
騒音が増大し、また第２図に示す如く機関回転速
度が増大する程エンジン騒音も増大することが知
られている。しかもエンジン加速時には着火遅れ
が長くなつて、燃焼時の燃焼室内圧力が急激に増
大することにより極めてエンジン騒音が増大す
る。 By the way, as shown in FIG. 1 in vehicles such as automobiles, engine noise increases rapidly when the fuel injection amount exceeds a predetermined value, and as shown in FIG. 2, engine noise also increases as the engine rotation speed increases. It has been known. Moreover, when the engine accelerates, the ignition delay becomes longer, and the pressure in the combustion chamber during combustion increases rapidly, resulting in a significant increase in engine noise.
以上の事実から、本考案ではフユーミゲーシヨ
ン、パイロツトインジエクシヨン等の補助燃料の
供給を、最もエンジン騒音が増大する所定値以上
の機関負荷で、所定値以上の機関回転速度領域に
おける加速時にのみ前記補助燃料の供給を行なう
ことによつて、最も大きな騒音領域を解消し、同
時に燃費の悪化を最小限にとどめることができ
る。 Based on the above facts, the present invention reduces the supply of auxiliary fuel such as fumigation and pilot injection during acceleration in the engine speed range above a predetermined value and with an engine load above a predetermined value where engine noise increases the most. By only supplying the auxiliary fuel, the loudest noise region can be eliminated, and at the same time, deterioration in fuel efficiency can be kept to a minimum.
また、補助燃料を吸気通路内に噴射させる構成
とすることによつて、補助燃料供給システムの機
構が簡素化できる。 Furthermore, by injecting the auxiliary fuel into the intake passage, the mechanism of the auxiliary fuel supply system can be simplified.
以下に本考案の実施例を第４図に基づいて説明
する。 An embodiment of the present invention will be described below based on FIG. 4.
デイーゼルエンジン１の燃焼室２に主燃料噴射
弁３を臨設する。一方、デイーゼルエンジンの吸
気通路４に補助燃料噴射弁５を臨ませる。 A main fuel injection valve 3 is installed in a combustion chamber 2 of a diesel engine 1. On the other hand, an auxiliary fuel injection valve 5 is placed facing the intake passage 4 of the diesel engine.
これによつて、主燃料噴射弁３の燃料噴射に先
立つて、補助燃料噴射弁５から微量の補助燃料を
吸気通路４内に噴射供給し、燃焼室２内に混合気
を形成する。該補助燃料はピストン６の圧縮行程
において加圧、昇温され、極めて着火し易い雰囲
気下におかれる。その後、主燃料噴射弁３から燃
焼室２内に出力燃料が噴射されると、極めて短か
い着火遅れを経て主燃料が燃焼を開始するため、
燃焼室内圧力上昇率が低く、もつて燃焼騒音の低
減が図れる。 As a result, prior to fuel injection from the main fuel injection valve 3, a small amount of auxiliary fuel is injected and supplied from the auxiliary fuel injection valve 5 into the intake passage 4 to form an air-fuel mixture within the combustion chamber 2. The auxiliary fuel is pressurized and heated during the compression stroke of the piston 6, and placed in an atmosphere where it is extremely easy to ignite. After that, when the output fuel is injected into the combustion chamber 2 from the main fuel injection valve 3, the main fuel starts combustion after an extremely short ignition delay.
The rate of pressure rise in the combustion chamber is low, and combustion noise can be reduced.
かかる補助燃料噴射は常時なされる訳ではな
く、次に説明する構成によつて所定のエンジン運
転領域においてのみなされる。出力用燃料は燃料
噴射ポンプ７から噴射パイプ８を介して主燃料噴
射弁３に供給されるが、補助燃料噴射弁５には他
の圧力源例えば燃料フイードポンプ９から補助燃
料供給通路１０を介して補助燃料が供給される。
該補助燃料供給通路１０に電磁開閉弁１１が介装
される。該電磁開閉弁１１は補助噴射弁制御ユニ
ツト１２から開弁信号が出力されたときのみ補助
燃料供給通路１０を開弁する。補助噴射弁制御ユ
ニツト１２にはエンジンの種々の運転状態が入力
される。即ち、エンジンの負荷条件としては燃料
噴射ポンプ７の燃料量コントロールラツク１３の
位置を検出するポテンショメータ１４から前記燃
料量コントロールラツク１３の位置に応じた電気
出力が増幅器１５を介して補助噴射弁制御ユニツ
ト１２に入力される。 Such auxiliary fuel injection is not performed all the time, but is performed only in a predetermined engine operating range by the configuration described below. The output fuel is supplied from the fuel injection pump 7 to the main fuel injection valve 3 via the injection pipe 8, but the auxiliary fuel injection valve 5 is supplied from another pressure source such as a fuel feed pump 9 via the auxiliary fuel supply passage 10. Auxiliary fuel is supplied.
An electromagnetic on-off valve 11 is interposed in the auxiliary fuel supply passage 10 . The electromagnetic on-off valve 11 opens the auxiliary fuel supply passage 10 only when a valve opening signal is output from the auxiliary injection valve control unit 12. Various operating conditions of the engine are input to the auxiliary injection valve control unit 12. That is, as a load condition of the engine, an electrical output corresponding to the position of the fuel quantity control rack 13 of the fuel injection pump 7 is transmitted from the potentiometer 14 to the auxiliary injection valve control unit via the amplifier 15. 12 is input.
一方、フライホイール外周のリングギア１６の
回転速度を電磁ピツクアツプ１７が検出し、エン
ジン回転速度に相応する電気信号を増幅器１８を
介して補助噴射弁制御ユニツト１２に入力され
る。 On the other hand, an electromagnetic pickup 17 detects the rotational speed of a ring gear 16 on the outer periphery of the flywheel, and an electric signal corresponding to the engine rotational speed is inputted to the auxiliary injection valve control unit 12 via an amplifier 18.
また、前記電磁ピツクアツプ１７の出力信号は
微分回路１９によつて微分され、エンジン加速度
に相応する信号として補助噴射弁制御ユニツト１
２に入力される。 Further, the output signal of the electromagnetic pickup 17 is differentiated by a differentiation circuit 19, and is sent to the auxiliary injection valve control unit 1 as a signal corresponding to the engine acceleration.
2 is input.
以上の如くして、エンジンの負荷、回転速度、
加速度信号が補助噴射弁制御ユニツト１２に入力
され、第３図に斜線で示すように、負荷及びエン
ジン回転速度が所定値以上でかつエンジンが加速
領域にある場合のみ電磁開閉弁１１を開弁すべく
出力するのである。 As described above, the engine load, rotation speed,
The acceleration signal is input to the auxiliary injection valve control unit 12, and the electromagnetic on-off valve 11 is opened only when the load and engine speed are above a predetermined value and the engine is in the acceleration region, as shown by diagonal lines in FIG. output as much as possible.
以上のように本考案では、通常運転領域では主
燃料噴射弁からのみ燃料を噴射し、エンジン所定
値以上の負荷及び回転速度領域であつて、かつエ
ンジン加速時のみ主燃料即ち出力用燃料の噴射に
先立つて補助燃料供給装置から補助燃料を供給
し、前記出力用燃料が着火し易い雰囲気に燃焼室
内を保つようにしたので、最もエンジン騒音の高
いエンジン運転領域の騒音レベルを低減し、その
他の運転領域はかかる補助燃料噴射を行なわない
ために燃費を向上させることができる。また、補
助燃料噴射弁を吸気通路に配置したので、噴射圧
が低くてよく低圧用の低コストのものが使用でき
ると共に燃焼室に噴射する場合に比べて噴射タイ
ミングや噴射量を高精度にコントロールする必要
がなく電磁開閉弁によるON−OFF的な極めて簡
単な噴射制御でよい。従つて、制御システムが簡
単であり低コストにできる。 As described above, in the present invention, fuel is injected only from the main fuel injection valve in the normal operating range, and main fuel, that is, output fuel, is injected only when the engine load and rotation speed are above a predetermined value and when the engine is accelerating. Since the auxiliary fuel is supplied from the auxiliary fuel supply device prior to the engine operation, and the combustion chamber is maintained in an atmosphere in which the output fuel is easily ignited, the noise level in the engine operating region where the engine noise is highest is reduced, and the other Since such auxiliary fuel injection is not performed in the operating region, fuel efficiency can be improved. In addition, since the auxiliary fuel injection valve is placed in the intake passage, the injection pressure is low, allowing the use of low-pressure, low-cost injectors, and controlling injection timing and injection amount with higher precision than when injecting into the combustion chamber. There is no need to do so, and an extremely simple injection control such as ON-OFF using an electromagnetic on-off valve is sufficient. Therefore, the control system is simple and can be made at low cost.
尚、エンジン回転速度及び負荷並びに加速度の
検出手段は上記に限らず他の公知手段を用いるこ
とができる。 Note that the means for detecting the engine rotational speed, load, and acceleration are not limited to those described above, and other known means may be used.
また、補助燃料噴射弁に限らず、出力用燃料の
噴射に先立つて補助燃料が供給され、出力用燃料
の着火性を良好にする雰囲気にするための他の補
助燃料供給手段を用いてもよい。 Furthermore, other than the auxiliary fuel injection valve, other auxiliary fuel supply means may be used to provide an atmosphere in which auxiliary fuel is supplied prior to injecting the output fuel and improves the ignitability of the output fuel. .
第１図は燃料噴射量即ちエンジン負荷と燃焼騒
音の相関関係を示すグラフ、第２図はエンジン回
転速度とエンジン騒音の相関関係を示すグラフ、
第３図は本考案にかかる補助燃料供給装置の作動
領域を示すグラフであつて該領域における加速運
転時にのみ補助燃料供給がなされることを示し、
第４図は本考案の一実施例を示す制御系統図であ
る。
１……デイーゼルエンジン、３……主燃料噴射
弁、５……補助燃料噴射弁（補助燃料供給装置）、
１０……補助燃料供給通路、１１……電磁開閉
弁、１２……補助噴射弁制御ユニツト。
Fig. 1 is a graph showing the correlation between fuel injection amount, that is, engine load, and combustion noise, Fig. 2 is a graph showing the correlation between engine rotation speed and engine noise,
FIG. 3 is a graph showing the operating range of the auxiliary fuel supply device according to the present invention, and shows that auxiliary fuel is supplied only during acceleration operation in this range,
FIG. 4 is a control system diagram showing an embodiment of the present invention. 1... Diesel engine, 3... Main fuel injection valve, 5... Auxiliary fuel injection valve (auxiliary fuel supply device),
10... Auxiliary fuel supply passage, 11... Solenoid on-off valve, 12... Auxiliary injection valve control unit.
Claims (1)
と、フユーミゲーシヨン或いはパイロツト噴射等
出力用燃料の噴射に先立つて補助燃料を供給し出
力用燃料の着火性を助ける補助燃料供給装置とを
備えたデイーゼルエンジンにおいて、前記主燃料
噴射弁を燃焼室内に臨ませる一方、前記補助燃料
供給装置の補助燃料噴射弁を吸気通路に臨ませ、
前記補助燃料噴射弁と燃料圧力源とを接続する補
助燃料供給通路に電磁開閉弁を介装すると共に、
エンジン運転状態検出装置と、該検出装置の出力
に基づき前記電磁開閉弁をエンジンの所定値以上
の高速高負荷領域でかつエンジン加速時に開弁さ
せる補助噴射弁制御ユニツトと、を設けたことを
特徴とするデイーゼルエンジンの騒音低減装置。 A main fuel injection valve that injects output fuel into a combustion chamber, and an auxiliary fuel supply device that supplies auxiliary fuel prior to injection of output fuel such as fumigation or pilot injection to help improve the ignitability of output fuel. In the diesel engine equipped with the above, the main fuel injection valve faces into the combustion chamber, while the auxiliary fuel injection valve of the auxiliary fuel supply device faces the intake passage,
An electromagnetic on-off valve is interposed in the auxiliary fuel supply passage connecting the auxiliary fuel injection valve and the fuel pressure source, and
The present invention is characterized in that it is provided with an engine operating state detection device, and an auxiliary injection valve control unit that opens the electromagnetic on-off valve based on the output of the detection device in a high-speed, high-load region of the engine equal to or higher than a predetermined value and when the engine accelerates. Diesel engine noise reduction device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19497381U JPS58102738U (en) | 1981-12-29 | 1981-12-29 | Diesel engine noise reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19497381U JPS58102738U (en) | 1981-12-29 | 1981-12-29 | Diesel engine noise reduction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58102738U JPS58102738U (en) | 1983-07-13 |
| JPH0143509Y2 true JPH0143509Y2 (en) | 1989-12-18 |
Family
ID=30108268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19497381U Granted JPS58102738U (en) | 1981-12-29 | 1981-12-29 | Diesel engine noise reduction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58102738U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6028243U (en) * | 1983-08-01 | 1985-02-26 | 日産自動車株式会社 | Direct cylinder injection engine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3924598A (en) * | 1972-11-01 | 1975-12-09 | Texaco Inc | Internal combustion engine |
| JPS526413A (en) * | 1975-07-07 | 1977-01-18 | Nippon Telegr & Teleph Corp <Ntt> | Colour picture recorder and reproducer |
-
1981
- 1981-12-29 JP JP19497381U patent/JPS58102738U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58102738U (en) | 1983-07-13 |
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