JPH08218994A - How to start a Miller cycle spark ignition engine - Google Patents
How to start a Miller cycle spark ignition engineInfo
- Publication number
- JPH08218994A JPH08218994A JP7026353A JP2635395A JPH08218994A JP H08218994 A JPH08218994 A JP H08218994A JP 7026353 A JP7026353 A JP 7026353A JP 2635395 A JP2635395 A JP 2635395A JP H08218994 A JPH08218994 A JP H08218994A
- Authority
- JP
- Japan
- Prior art keywords
- starting
- valve
- engine
- spark ignition
- miller cycle
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/32—Miller cycle
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Ignition Timing (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、停止中のミラーサイク
ル火花点火機関の始動の改良に関する。FIELD OF THE INVENTION The present invention relates to improved starting of a Miller cycle spark ignition engine while it is stopped.
【０００２】[0002]
【従来の技術】ミラーサイクルによる火花点火機関（以
下「ミラーサイクル機関」という）では、吸気弁の閉じ
る時期を通常よりも早くするか（所謂「早閉じ」）、或
いは遅く（所謂「遅閉じ」）することにより、圧縮比は
そのままで膨脹比を大とすることができる。そして、こ
れによりノッキングを抑制し、かつ熱効率を向上させる
ことができるという優れた作用効果を奏するものとして
公知である。2. Description of the Related Art In a spark ignition engine using a Miller cycle (hereinafter referred to as "Miller cycle engine"), the intake valve is closed earlier than usual (so-called "early closing") or late (so-called "late closing"). By doing so, the expansion ratio can be increased while maintaining the compression ratio. And, it is known that the knocking can be suppressed and the thermal efficiency can be improved by this.
【０００３】ここで、ミラーサイクル機関では吸気弁が
開いている時期を通常のエンジンより短く（早閉じ）或
いは長く（遅閉じ）したため、実質的な吸気行程が短く
なり、吸入空気量（混合気量）が減少する。その結果、
出力不足にならない様に、ターボチャージャ等により過
給している。Here, in the Miller cycle engine, the intake valve is opened for a shorter time (early closing) or longer (late closing) than a normal engine, so that the intake stroke is substantially shortened and the intake air amount (mixture air Amount) decreases. as a result,
It is supercharged by a turbocharger, etc. so as not to run short of output.
【０００４】[0004]
【発明が解決しようとする課題】しかし、ミラーサイク
ル機関が停止しており、所謂「冷機時」である場合、始
動に際して、ターボチャージャが作用しないため吸入混
合気量が減少し、圧縮不足により温度が十分に上がら
ず、始動し難くなるという問題を有していた。However, when the Miller cycle engine is stopped and the engine is in the so-called "cold state", the turbocharger does not work at the time of starting, so that the intake air-fuel mixture amount decreases and the temperature becomes insufficient due to insufficient compression. Had a problem that it did not rise sufficiently and it became difficult to start.
【０００５】本発明は上述した様な問題点に鑑みて提案
されたものであり、ミラーサイクル火花点火機関の始動
を容易にすることが出来る様なミラーサイクル火花点火
機関の始動方法の提供を目的としている。The present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to provide a method for starting a Miller cycle spark ignition engine capable of facilitating the starting of the Miller cycle spark ignition engine. I am trying.
【０００６】[0006]
【課題を解決するための手段】本発明のミラーサイクル
火花点火機関の始動方法は、点火時期をクランクアング
ルで圧縮行程における上死点に近い位置まで遅らせてい
る。In the method for starting a Miller cycle spark ignition engine according to the present invention, the ignition timing is delayed by the crank angle to a position close to the top dead center in the compression stroke.
【０００７】また本発明のミラーサイクル火花点火機関
の始動方法は、機関の吸気弁の上流側に弁を設置し、そ
の弁を始動時に吸気行程下死点において閉じることを特
徴としている。ここで前記弁は、ロータリバルブで構成
されているか、リードバルブで構成されているか、バタ
フライバルブで構成されているのが好ましい。Further, the method for starting the Miller cycle spark ignition engine of the present invention is characterized in that a valve is installed upstream of the intake valve of the engine and the valve is closed at the bottom dead center of the intake stroke at the time of starting. Here, it is preferable that the valve is a rotary valve, a reed valve, or a butterfly valve.
【０００８】さらに本発明のミラーサイクル火花点火機
関の始動方法は、機関の吸気弁の上流に電気ヒータを設
置し、機関の始動時に前記ヒータに通電し吸気を加熱す
ることを特徴としている。Further, the method for starting the Miller cycle spark ignition engine of the present invention is characterized in that an electric heater is installed upstream of the intake valve of the engine, and the heater is energized to heat the intake air when the engine is started.
【０００９】そして本発明のミラーサイクル火花点火機
関の始動方法は、機関に設けられているターボチャージ
ャの水冷式インタークーラの冷却水通路にコックを設置
し、始動時にコックを閉じて冷却水の循環を停止するこ
とを特徴としている。A mirror cycle spark ignition engine starting method according to the present invention is to install a cock in a cooling water passage of a water-cooled intercooler of a turbocharger installed in the engine, and close the cock at the time of starting to circulate the cooling water. It is characterized by stopping.
【００１０】また本発明のミラーサイクル火花点火機関
の始動方法は、機関に設けられているターボチャージャ
の水冷式インタークーラの冷却水通路に切換コックを設
置し、始動時に切換コックを温水回路に切換えて温水を
循環している。Further, in the method for starting a mirror cycle spark ignition engine of the present invention, a switching cock is installed in a cooling water passage of a water-cooled intercooler of a turbocharger installed in the engine, and the switching cock is switched to a hot water circuit at the time of starting. Circulating hot water.
【００１１】[0011]
【作用】上記した様な構成を具備する本発明によれば、
冷機時の回転数の遅い始動において、点火のタイミング
がクランクアングルでできるだけ上死点に近い位置とす
れば、気筒内の混合気の温度は通常の機関の点火のタイ
ミングの位置よりさらに圧縮されて高くなっており、そ
れだけ着火しやすく始動性が向上する。According to the present invention having the above-mentioned structure,
If the ignition timing is set to a position that is as close to top dead center as possible at the crank angle when the engine is running at a slow speed during cold engine operation, the temperature of the air-fuel mixture in the cylinder will be compressed further than at the ignition timing of a normal engine. The higher the temperature, the easier it is to ignite and the better the starting performance.
【００１２】また、吸気弁の上流側にロータリバルブを
設置し、始動時には吸入行程の下死点から閉じれば、吸
気弁の閉じる位置に関係なく有効圧縮比が大となり、混
合気の圧力、温度が上昇し着火性が向上するので、始動
性はよくなる。ここで、ロータリバルブに替えて、リー
ドバルブやバタフライバルブでもよく、できるだけ吸気
弁に近いほうが効果が大である。If a rotary valve is installed on the upstream side of the intake valve and closed from the bottom dead center of the intake stroke at the time of starting, the effective compression ratio becomes large regardless of the closed position of the intake valve, and the pressure and temperature of the air-fuel mixture are increased. Is increased and the ignitability is improved, so that the startability is improved. Here, a reed valve or a butterfly valve may be used instead of the rotary valve, and the effect is larger when the valve is as close to the intake valve as possible.
【００１３】さらに、吸気弁の上流に電気ヒータを設置
し、始動時に通電して吸気を加熱することは効果が大で
あり、同様に始動時にインタークーラの冷却水の循環を
停止したり、積極的にボイラーの温水でインタークーラ
を加熱すれば、さらに効果がある。Further, it is very effective to install an electric heater upstream of the intake valve to heat the intake air by energizing it at the time of starting. Similarly, at the time of starting, the circulation of the cooling water of the intercooler is stopped, or positively. It is even more effective to heat the intercooler with hot water from the boiler.
【００１４】[0014]
【実施例】以下、図面を参照して、本発明の実施例に付
いて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１５】図１は本発明のミラーサイクル機関の始動
方法を実施するミラーサイクル機関のピストン・シリン
ダユニットの要部を示し、ピストン２はコネクチングロ
ッド３を介して図示しないクランクシャフトに連結され
ている。FIG. 1 shows a main part of a piston / cylinder unit of a Miller cycle engine for carrying out a method for starting a Miller cycle engine according to the present invention. A piston 2 is connected to a crankshaft (not shown) through a connecting rod 3. .
【００１６】また、シリンダヘッド１の吸気ポート６に
は吸気弁４が設けられ、排気ポート７には排気弁５が設
けられ、その間にはスパークプラグ８が取付けられ、そ
のスパークプラグ８は図示しない任意公知の点火装置と
高圧コード９で接続されている。An intake valve 6 is provided in the intake port 6 of the cylinder head 1, an exhaust valve 5 is provided in the exhaust port 7, and a spark plug 8 is mounted between them, and the spark plug 8 is not shown. It is connected to any known ignition device by a high-voltage cord 9.
【００１７】そして、通常のオットーサイクル機関の場
合には、クランクアングルで、例えば上死点前１５〜３
０°で点火するよう構成されているが、本願の方法では
始動時に０〜１０°で点火されている。In the case of an ordinary Otto cycle engine, the crank angle is, for example, 15 to 3 before top dead center.
Although configured to ignite at 0 °, the method of the present application ignites at 0-10 ° at startup.
【００１８】したがって、この例の場合は始動時にクラ
ンクアングルで１５°だけ点火前に多く圧縮されるの
で、混合気の温度が上昇し着火しやすくなり、始動性が
向上する。そして、調整で対応できるので便利である。Therefore, in the case of this example, at the time of starting, the crank angle is much compressed by 15 ° before ignition, so that the temperature of the air-fuel mixture rises and ignition becomes easier, and the startability is improved. And it is convenient because it can be adjusted.
【００１９】図２は本発明の第２実施例を示し、吸気ポ
ート６にポートを閉じる弁であるロータリバルブ１０を
設置している。そして、ピストン２が吸気行程が終了す
る下死点付近に来たとき閉じる事により有効圧縮比が大
となり、混合気の圧力と温度が上昇して着火性が向上す
る。FIG. 2 shows a second embodiment of the present invention, in which a rotary valve 10 which is a valve for closing the intake port 6 is installed. The piston 2 closes when it reaches the bottom dead center near the end of the intake stroke, so that the effective compression ratio becomes large, the pressure and temperature of the air-fuel mixture rise, and the ignitability improves.
【００２０】図３は本発明の第２実施例の別の実施例を
を示し、第２実施例に対しロータリバルブに替えてリー
ドバルブ１１とした事以外同様であり、作用に付いても
変わりがない。FIG. 3 shows another embodiment of the second embodiment of the present invention, which is the same as the second embodiment except that the reed valve 11 is used instead of the rotary valve, and the operation is different. There is no.
【００２１】図４は本発明の第２実施例の他の実施例を
示し、第２実施例に対しロータリバルブに替えてバタフ
ライバルブ１２とした事以外同様であり、作用に付いて
も変わりがない。FIG. 4 shows another embodiment of the second embodiment of the present invention, which is similar to the second embodiment except that the butterfly valve 12 is used instead of the rotary valve, and the operation is the same. Absent.
【００２２】図５は本発明の第３実施例を示し、吸気ポ
ート６とインタークーラ１３との間に電気ヒータ１６を
設置して混合気を加熱する方法を示し、始動前にヒータ
に通電してヒータ１６を昇温しておけば混合気の温度が
上昇し着火し易くなる。なお、インタークーラ１３がな
い場合でも同様に作用する。FIG. 5 shows a third embodiment of the present invention in which an electric heater 16 is installed between the intake port 6 and the intercooler 13 to heat the air-fuel mixture, and the heater is energized before starting. If the heater 16 is heated to raise the temperature of the air-fuel mixture, it becomes easier to ignite. In addition, even if the intercooler 13 is not provided, the same operation is performed.
【００２３】図６は本発明の第４実施例を示している。
図６において、吸気ポート６に接続されたインタークー
ラ１３の冷却水の入口１４をコック１７を介してクーリ
ングタワー（又はラジエタ）１８に接続されている。通
常、クーリングタワー１８の冷却水はポンプＰにより循
環されるが、第４実施例においては、機関の始動時にポ
ンプＰをＯＦＦにするか、或いは、バイパス通路ＢＬを
設け且つ機関の始動時にコック１７を切換えることによ
り、冷却水がインタークーラ１３に循環しない様に構成
している。これにより、機関の始動時には冷却水はイン
タークーラを通らず、混合気は冷却されない。FIG. 6 shows a fourth embodiment of the present invention.
In FIG. 6, the cooling water inlet 14 of the intercooler 13 connected to the intake port 6 is connected to a cooling tower (or radiator) 18 via a cock 17. Normally, the cooling water of the cooling tower 18 is circulated by the pump P, but in the fourth embodiment, the pump P is turned off when the engine is started, or the bypass passage BL is provided and the cock 17 is turned on when the engine is started. By switching, the cooling water is configured not to circulate in the intercooler 13. As a result, the cooling water does not pass through the intercooler when the engine is started, and the air-fuel mixture is not cooled.
【００２４】また、図７は第５実施例を示し、インター
クーラー１３の冷却水入口１４は切換弁である３方コッ
ク２０を介して、タンク１８とボイラー１９とに接続さ
れており、３方コック２０をボイラー１９側に切換え、
ボイラー１９から温水をインタークーラ１３に供給すれ
ば混合気加熱の効果が大であり、始動後にタンク１８側
に切換える。FIG. 7 shows the fifth embodiment, in which the cooling water inlet 14 of the intercooler 13 is connected to the tank 18 and the boiler 19 via a three-way cock 20 which is a switching valve. Switch 20 to the boiler 19 side,
If hot water is supplied from the boiler 19 to the intercooler 13, the effect of heating the air-fuel mixture is great, and the tank 18 side is switched after starting.
【００２５】また、上記の実施例に示された点火時期の
リタード、吸気ポートに弁を設ける方法、ヒータによる
混合気の加熱、インタークーラの冷却水の循環停止の方
法は同時に実施してもよいが、いずれも負荷運転時に適
用する事は好ましくない。Further, the retard of ignition timing, the method of providing a valve in the intake port, the heating of the air-fuel mixture by the heater, and the method of stopping the circulation of the cooling water of the intercooler shown in the above embodiment may be carried out at the same time. However, it is not preferable to apply them during load operation.
【００２６】[0026]
【発明の効果】本発明は上記の通り構成されており、以
下に述べる優れた効果を奏することができる。 （１） ミラーサイクル火花点火機関の始動時に混合気
の圧力や温度を高くし、混合気の着火を容易にする方法
を提供している。 （２） したがって、容易にかつ安価にミラーサイクル
火花点火機関の始動性を向上することができる。The present invention is configured as described above, and can exhibit the following excellent effects. (1) A method for facilitating ignition of an air-fuel mixture by increasing the pressure and temperature of the air-fuel mixture at the time of starting the Miller cycle spark ignition engine is provided. (2) Therefore, the startability of the Miller cycle spark ignition engine can be improved easily and inexpensively.
【図１】本発明の一実施例を示すミラーサイクル機関の
始動方法を実施する装置の模式図。FIG. 1 is a schematic diagram of an apparatus for carrying out a method for starting a Miller cycle engine according to an embodiment of the present invention.
【図２】本発明の第２実施例を示す図。FIG. 2 is a diagram showing a second embodiment of the present invention.
【図３】図２の別の実施例を示す図。FIG. 3 is a diagram showing another embodiment of FIG.
【図４】図２の他の実施例を示す図。FIG. 4 is a diagram showing another embodiment of FIG.
【図５】本発明の第３実施例を示す図。FIG. 5 is a diagram showing a third embodiment of the present invention.
【図６】本発明の第４実施例を示す図。FIG. 6 is a diagram showing a fourth embodiment of the present invention.
【図７】本発明の第５実施例を示す図。FIG. 7 is a diagram showing a fifth embodiment of the present invention.
１…シリンダヘッド ２…ピストン ３…コネクチンブロッド ４…吸気弁 ５…排気弁 ６…吸気ポート ７…排気ポート ８…スパークプラグ ９…高圧コード １０…ロータリバルブ １１…リードバルブ １２…バタフライバルブ １３…インタークーラ １６…ヒーター １７…コック １８…クーリングタワー 1 ... Cylinder head 2 ... Piston 3 ... Connecting rod 4 ... Intake valve 5 ... Exhaust valve 6 ... Intake port 7 ... Exhaust port 8 ... Spark plug 9 ... High pressure cord 10 ... Rotary valve 11 ... Reed valve 12 ... Butterfly valve 13 ... Inter Cooler 16 ... Heater 17 ... Cock 18 ... Cooling tower
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｎ 17/00 Ｆ０２Ｎ 17/04 Ａ 17/04 Ｆ０２Ｍ 31/12 ３０１Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location F02N 17/00 F02N 17/04 A 17/04 F02M 31/12 301G
Claims (8)
における上死点に近い位置まで遅らせることを特徴とす
るミラーサイクル火花点火機関の始動方法。1. A method for starting a Miller cycle spark ignition engine, comprising: delaying an ignition timing by a crank angle to a position close to a top dead center in a compression stroke.
の弁を始動時に吸気行程下死点において閉じることを特
徴とするミラーサイクル火花点火機関の始動方法。2. A method for starting a Miller cycle spark ignition engine, which comprises installing a valve upstream of an intake valve of the engine and closing the valve at the bottom dead center of the intake stroke at the time of starting.
し、機関の始動時に前記ヒータに通電し吸気を加熱する
ことを特徴とするミラーサイクル火花点火機関の始動方
法。3. A method for starting a Miller cycle spark ignition engine, wherein an electric heater is installed upstream of an intake valve of the engine, and the heater is energized to heat intake air when the engine is started.
の水冷式インタークーラの冷却水通路にコックを設置
し、始動時にコックを閉じて冷却水の循環を停止するこ
とを特徴とするミラーサイクル火花点火機関の始動方
法。4. A mirror cycle spark ignition, characterized in that a cock is installed in a cooling water passage of a water-cooled intercooler of a turbocharger installed in an engine, and the cock is closed at the time of starting to stop the circulation of the cooling water. How to start the engine.
の水冷式インタークーラの冷却水通路に切換コックを設
置し、始動時に切換コックを温水回路に切換えて温水を
循環することを特徴とするミラーサイクル火花点火機関
の始動方法。5. A mirror cycle characterized in that a switching cock is installed in a cooling water passage of a water-cooled intercooler of a turbocharger installed in an engine, and the switching cock is switched to a hot water circuit at the time of starting to circulate hot water. How to start a spark ignition engine.
２に記載のミラーサイクル火花点火機関の始動方法。6. The method for starting a Miller cycle spark ignition engine according to claim 2, wherein the method comprises a rotary valve.
請求項２に記載のミラーサイクル火花点火機関の始動方
法。7. The method for starting a Miller cycle spark ignition engine according to claim 2, wherein the valve is a reed valve.
いる請求項２に記載のミラーサイクル火花点火機関の始
動方法。8. The method for starting a Miller cycle spark ignition engine according to claim 2, wherein the valve is a butterfly valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7026353A JPH08218994A (en) | 1995-02-15 | 1995-02-15 | How to start a Miller cycle spark ignition engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7026353A JPH08218994A (en) | 1995-02-15 | 1995-02-15 | How to start a Miller cycle spark ignition engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08218994A true JPH08218994A (en) | 1996-08-27 |
Family
ID=12191115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7026353A Pending JPH08218994A (en) | 1995-02-15 | 1995-02-15 | How to start a Miller cycle spark ignition engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08218994A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009508046A (en) * | 2005-09-12 | 2009-02-26 | フィアット・オートモベイス・エス．エー−フィリアル・メカニカ | Cold start assistance system for alcohol and flex engines with intake and alcohol warming |
| JP2010261425A (en) * | 2009-05-11 | 2010-11-18 | Yamaha Motor Co Ltd | Spark ignition internal combustion engine |
| JP2013079589A (en) * | 2011-10-03 | 2013-05-02 | Daihatsu Diesel Mfg Co Ltd | Air cooler for internal combustion engine |
-
1995
- 1995-02-15 JP JP7026353A patent/JPH08218994A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009508046A (en) * | 2005-09-12 | 2009-02-26 | フィアット・オートモベイス・エス．エー−フィリアル・メカニカ | Cold start assistance system for alcohol and flex engines with intake and alcohol warming |
| JP2010261425A (en) * | 2009-05-11 | 2010-11-18 | Yamaha Motor Co Ltd | Spark ignition internal combustion engine |
| JP2013079589A (en) * | 2011-10-03 | 2013-05-02 | Daihatsu Diesel Mfg Co Ltd | Air cooler for internal combustion engine |
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