JPH0635830B2 - Exhaust timing control valve drive for 2-cycle engine - Google Patents
Exhaust timing control valve drive for 2-cycle engineInfo
- Publication number
- JPH0635830B2 JPH0635830B2 JP60016272A JP1627285A JPH0635830B2 JP H0635830 B2 JPH0635830 B2 JP H0635830B2 JP 60016272 A JP60016272 A JP 60016272A JP 1627285 A JP1627285 A JP 1627285A JP H0635830 B2 JPH0635830 B2 JP H0635830B2
- Authority
- JP
- Japan
- Prior art keywords
- opening
- control valve
- engine
- closing
- cylinder
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/028—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation for two-stroke engines
- F02D13/0284—Variable control of exhaust valves only
-
- 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
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- 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)
- Characterised By The Charging Evacuation (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、排気制御弁つき２サイクルエンジンの出力特
性の改善を図った、２サイクルエンジンの排気時期制御
弁駆動装置に関するものである。TECHNICAL FIELD The present invention relates to an exhaust timing control valve drive device for a two-cycle engine, which improves the output characteristics of a two-cycle engine with an exhaust control valve.
「従来の技術」 一般に、エンジンにあつては低回転時と高回転時とで排
気時期を変えることにより、出力特性を向上させること
が行なわれているが、２サイクルエンジンでは、その排
気通路とシリンダ内部との連通および遮断をシリンダ内
のピストンの上下動によつて行なうようにしているため
に、排気時期を変更する場合、排気通路の開口上端縁の
位置をピストンの移動方向に変化させる必要がある。"Prior Art" Generally, in an engine, the output characteristic is improved by changing the exhaust timing at the time of low rotation and at the time of high rotation. When the exhaust timing is changed, it is necessary to change the position of the upper end edge of the opening of the exhaust passage in the moving direction of the piston, because communication with and disconnection from the inside of the cylinder is performed by vertical movement of the piston in the cylinder. There is.
この種の２サイクルエンジンの排気時期制御装置として
は、本願出願人が先に提案した特願昭５９−１７８８７
３号がある。これは、制御弁が排気通路を閉塞した状態
において、シリンダの内面とほぼ連続する制御面を前記
制御弁に形成するとともに、該制御面とエンジンの他の
部位との接触を防止しつつ制御弁の開閉移動をなす駆動
機構を連設することにより、低回転時から高速回転時に
至る広い回転域で出力特性を向上させるようにしたもの
である。As an exhaust timing control device for a two-cycle engine of this type, Japanese Patent Application No. 59-17887 previously proposed by the applicant of the present application.
There is number 3. This is because the control valve forms a control surface that is substantially continuous with the inner surface of the cylinder in the control valve when the control valve closes the exhaust passage, and prevents the control surface from contacting other parts of the engine. By connecting the drive mechanism for the opening and closing movement, the output characteristics are improved in a wide rotation range from low rotation speed to high speed rotation.
「発明が解決しようとする問題点」 ところで、上述した排気制御弁つき２サイクルエンジン
にあっては、エンジン回転数が所定の値になったとき
に、スロットル開度のいかんにかかわらず一様に制御弁
の開閉を行っていたので、スロットル開度θthが4/4,1/
2,1/4と減少するに従って、エンジン出力Psの描くカー
ブ(出力カーブ)が第7図に示すように凹凸の大きなもの
になり、スムーズな出力特性が得られなくなるという欠
点があった。[Problems to be Solved by the Invention] By the way, in the above-described two-cycle engine with an exhaust control valve, when the engine speed reaches a predetermined value, it is uniform regardless of the throttle opening. Since the control valve was opened and closed, the throttle opening θth was 4 / 4,1 /
As it decreases to 2,1 / 4, the curve drawn by the engine output Ps (output curve) becomes more uneven as shown in FIG. 7, and smooth output characteristics cannot be obtained.
「問題点を解決するための手段」 上記問題点を解決するためにこの発明は、エンジンの回
転数を検出する回転数検出手段と、スロットルの開度を
検出するスロットル開度検出手段と、前記スロットルの
各開度毎に、制御弁の開閉切替を行うべきエンジン回転
数を開閉切替データとして記憶する記憶手段と、前記記
憶手段から読み出した開閉切替データによって前記制御
弁の開閉切替指令を出力する制御手段段と、前記開閉切
替指令に基づいてアクチュエータを駆動して前記制御弁
を開閉駆動させる駆動手段とを具備することを特徴とす
る。なお、上記開閉切替データは、各スロットル開度に
応じて出力カーブが最も滑らかになるデータを実験的に
求め、予め記憶手段に格納しておく。"Means for Solving Problems" In order to solve the above problems, the present invention relates to a rotation speed detecting means for detecting an engine speed, a throttle opening detecting means for detecting a throttle opening, and The opening / closing switching command for the control valve is output according to the opening / closing switching data read out from the storage means for storing the engine speed for opening / closing the control valve as opening / closing switching data for each opening of the throttle. It is characterized by comprising a control means stage and a drive means for driving the actuator based on the opening / closing switching command to open / close the control valve. As the opening / closing switching data, data for which the output curve becomes the smoothest is experimentally obtained according to each throttle opening, and is stored in advance in the storage means.
［作用］ 上記構成によれば、各スロットル開度に応じて出力カー
ブが最も滑らかになるデータが記憶手段から選択され、
これによって制御弁の全開／全閉の切替制御が行なわれ
るので、第6図に示すように、出力カーブを滑らかにす
ることができる。[Operation] According to the above configuration, the data that makes the output curve the smoothest is selected from the storage means according to each throttle opening,
As a result, the control valve is controlled to be fully opened / closed, so that the output curve can be made smooth as shown in FIG.
「実施例」 以下、本発明の好適な一実施例について第１図〜第５図
に基づき詳細に説明する。[Embodiment] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to Figs.
第１図中、符号１は本実施例による排気時期制御弁駆動
装置が適用された２サイクルエンジンを示すもので、シ
リンダ２と、該シリンダ２の側部に一体に設けられ、か
つ、シリンダ２の内面2aに開口３を有する排気通路４を
形成する排気管５と、該排気管５と前記シリンダ２との
接続部においてシリンダ２の壁を摺動可能に貫通しかつ
前記開口３の上部に突出する制御弁６とを備え、該制御
弁６に弁駆動装置７が連設されている。In FIG. 1, reference numeral 1 indicates a two-cycle engine to which the exhaust timing control valve drive system according to the present embodiment is applied. The cylinder 2 and the cylinder 2 are integrally provided on a side portion of the cylinder 2 and An exhaust pipe 5 forming an exhaust passage 4 having an opening 3 in an inner surface 2a of the cylinder 2, and a connecting portion between the exhaust pipe 5 and the cylinder 2 slidably penetrating a wall of the cylinder 2 and above the opening 3. A control valve 6 that projects is provided, and a valve drive device 7 is connected to the control valve 6.
次いでこれらの詳細について説明すれば、前記排気通路
４は、その開口３近傍から長さ方向に沿つて設けられた
補強材兼用の整流壁８によつてシリンダ２の周方向に沿
つて２分割されていて、該整流壁８の両側に、前記開口
３の上部を開閉する前記制御弁６が設けられている。Explaining these details, the exhaust passage 4 is divided into two along the circumferential direction of the cylinder 2 by a straightening wall 8 which also serves as a reinforcing member and is provided along the length direction from the vicinity of the opening 3. The control valves 6 for opening and closing the upper portion of the opening 3 are provided on both sides of the flow regulating wall 8.
前記制御弁６は、断面が正方形の直方体状に形成されて
おり、前記整流壁８に対し直交するようにシリンダ２の
壁を貫通し、排気通路４内でその開口３の上部に突出し
得るようになされており、かつ、前記開口３の上部を閉
塞する閉位置にある状態において前記シリンダ２の内部
に対向する面を、シリンダ２の内径と同一あるいは若干
大きい曲率に切削することによつて形成した円弧面状の
制御面6aが設けられている。このように制御弁６の断面
を正方形状とするのは、該制御弁６が閉位置にある時に
制御面6aの下端縁6bが排気通路４の開口３の上端縁3aと
平行となるようにする必要があるが、制御面6aをシリン
ダ２の内面形状に沿わせて円弧面とする場合、前述した
平行度を維持するための手段として、制御面6aの上下面
を平行にすることが好適であるからである。したがつ
て、前記制御面6aは、制御弁６が閉位置にある時に、前
記シリンダ２の内面にほぼ連続した状態となされる。The control valve 6 is formed in a rectangular parallelepiped shape having a square cross section, penetrates the wall of the cylinder 2 so as to be orthogonal to the flow regulating wall 8, and can project above the opening 3 in the exhaust passage 4. And is formed by cutting the surface facing the inside of the cylinder 2 to a curvature that is the same as or slightly larger than the inner diameter of the cylinder 2 in the closed position that closes the upper portion of the opening 3. A control surface 6a having a circular arc surface shape is provided. The square cross section of the control valve 6 is used so that the lower end edge 6b of the control surface 6a is parallel to the upper end edge 3a of the opening 3 of the exhaust passage 4 when the control valve 6 is in the closed position. However, when the control surface 6a is an arcuate surface along the inner surface of the cylinder 2, it is preferable to make the upper and lower surfaces of the control surface 6a parallel as a means for maintaining the parallelism described above. Because it is. Therefore, the control surface 6a is substantially continuous with the inner surface of the cylinder 2 when the control valve 6 is in the closed position.
そして、このように構成された制御弁６は、前記整流壁
８の両側に前記シリンダ２の壁を貫通して同軸上に一体
に設けられ、かつ、長さ方向に正方形状の貫通孔が形成
された一組のガイド筒９、９のそれぞれに摺動自在に支
持されている。The control valve 6 configured as described above is coaxially and integrally provided on both sides of the straightening wall 8 through the wall of the cylinder 2 and has a square through hole formed in the length direction. It is slidably supported by each of the set of guide cylinders 9, 9.
前記弁駆動装置７は、前記制御弁６を開閉動させるため
の回転力を出力するアクチユエータ10と、該アクチユエ
ータ10から出力される回転力を前記制御弁６に伝達する
動力伝達機構11とから構成されている。The valve drive device 7 includes an actuator 10 that outputs a rotational force for opening and closing the control valve 6, and a power transmission mechanism 11 that transmits the rotational force output from the actuator 10 to the control valve 6. Has been done.
前記アクチユエータ10は、例えばサーボモータが用いら
れ、前記エンジン１あるいは車体フレーム（図示略）等
の前記シリンダ２の近傍に取り付けられる。The actuator 10 uses, for example, a servo motor, and is attached near the cylinder 2 such as the engine 1 or a vehicle body frame (not shown).
前記動力伝達機構11は、第１図および第２図に示すよう
に、前記制御弁６の制御面6aが形成された側と反対側の
端部のそれぞれに連結ピン12、12を介して回動自在に連
結された一組の作動レバー13、13と、該作動レバー13、
13を揺動させる一組の出力軸14、14と、該各出力軸14、
14に連動可能に連結された駆動軸15と、該駆動軸15に連
動可能に連結されかつ該駆動軸15を前記アクチユエータ
10へ連絡するフレキシブルジヨイント16と、前記各出力
軸14、14と駆動軸15との間および該駆動軸15とフレキシ
ブルジヨイント16との間に設けられ、かつ、駆動側をウ
オーム17とし従動側をウオームホイール18としたウオー
ムギヤ19とによつて構成されている。As shown in FIG. 1 and FIG. 2, the power transmission mechanism 11 rotates through connecting pins 12 and 12 at the ends of the control valve 6 on the side opposite to the side where the control surface 6a is formed. A pair of actuating levers 13, 13 movably connected to each other, and the actuating levers 13,
A set of output shafts 14 and 14 for swinging 13 and the output shafts 14 and 14,
A drive shaft 15 operably connected to the drive shaft 14, and a drive shaft 15 operably connected to the drive shaft 15 and connected to the actuator.
A flexible joint 16 that communicates with the drive shaft 10 is provided between the output shafts 14 and 14 and the drive shaft 15 and between the drive shaft 15 and the flexible joint 16 and is driven by a worm 17 on the drive side. It is configured by a worm gear 19 whose side is a worm wheel 18.
そして前記各出力軸14と駆動軸15との間に設けられる２
つのウオームギヤ19は、それぞれ逆ピツチとなされてい
て、駆動軸15の一方向の回転、すなわち、アクチユエー
タ10の一方向の回転に対して前記各作動レバー13、13、
出力軸14、14をそれぞれ逆方向に作動させて、前記両制
御弁６を相互に接近離反する方向に移動させるようにな
っている。2 provided between each output shaft 14 and the drive shaft 15
The two worm gears 19 are respectively formed as reverse pitches, and the actuating levers 13, 13 are actuated with respect to the rotation of the drive shaft 15 in one direction, that is, the rotation of the actuator 10 in one direction.
The output shafts 14 and 14 are operated in the opposite directions to move the control valves 6 in the directions to move toward and away from each other.
次に、第５図は本実施例の電気的構成を示すものであ
る。この図において、２１は点火装置であり、エンジン
が１回転する毎に１個のパルス信号を出力する。該パル
ス信号は波形整形回路２２a によって整形された後、Ｆ
／Ｖ(周波数／電圧)変換器２２bによってパルス数に比
例した電圧に変換され、この電圧が制御回路２３に供給
される。なお、波形整形回路２２aとＦ／Ｖ変換器２２b
とが回転数検出回路２２を構成している。一方、２４は
スロットルの開度を検出するスロットル開度検出器であ
り、例えばスロットルに連結された３ビットのエンコー
ダからなり、その検出出力をアドレスデコーダ２５に供
給する。アドレスデコーダ２５の出力は、メモリ２６の
アドレス端に供給され、スロットル開度に対応するメモ
リアドレスをアクセスするようになっている。これらの
各メモリアドレスには、各スロットルの開度に応じて、
出力特性を最もスムーズに推移させる開閉切替データが
格納されている。これらの開閉切替データは、各スロッ
トル開度毎に制御弁６を開閉するべきエンジン回転数を
決定するもので、実験的に決定され、予めメモリ２６に
格納されている。このメモリ２６から読み出された開閉
切替データは、制御回路２３に供給される。制御回路２
３は、開閉切替データとエンジン回転数Ｎeとから制御
弁開度目標値(全閉／全開)を演算し、この目標値をアク
チュエータ１０の駆動回路２７に供給する。駆動回路２
７はアクチュエータ１０の回転量を検出するエンコーダ
２８からの信号によって、アクチュエータ１０の回転量
を検知しつつ、制御弁６の開度が制御弁開度目標値と一
致するように、フィードバック制御する。Next, FIG. 5 shows an electrical configuration of this embodiment. In this figure, reference numeral 21 denotes an ignition device, which outputs one pulse signal each time the engine makes one revolution. After the pulse signal is shaped by the waveform shaping circuit 22a, F
The voltage is converted into a voltage proportional to the number of pulses by the / V (frequency / voltage) converter 22b, and this voltage is supplied to the control circuit 23. The waveform shaping circuit 22a and the F / V converter 22b
And form a rotation speed detection circuit 22. On the other hand, reference numeral 24 is a throttle opening detector for detecting the opening of the throttle, which is composed of, for example, a 3-bit encoder connected to the throttle, and supplies the detection output thereof to the address decoder 25. The output of the address decoder 25 is supplied to the address end of the memory 26 to access the memory address corresponding to the throttle opening. In each of these memory addresses, depending on the opening of each throttle,
The open / close switching data that allows the output characteristics to transition most smoothly is stored. These opening / closing switching data determine the engine speed at which the control valve 6 should be opened / closed for each throttle opening, are determined experimentally, and are stored in the memory 26 in advance. The open / close switching data read from the memory 26 is supplied to the control circuit 23. Control circuit 2
Reference numeral 3 calculates a control valve opening target value (fully closed / fully opened) from the open / close switching data and the engine speed Ne, and supplies this target value to the drive circuit 27 of the actuator 10. Drive circuit 2
7 detects the rotation amount of the actuator 10 based on a signal from the encoder 28 that detects the rotation amount of the actuator 10, and performs feedback control so that the opening degree of the control valve 6 matches the control valve opening target value.
次に、上記の構成を有する本実施例の動作を説明する。Next, the operation of this embodiment having the above configuration will be described.
まず、エンジン１が起動されると、点火装置２１から回
転数検出回路２２へパルス信号が供給され、エンジン回
転数Ｎeが検出されて、制御回路２３へ供給される。や
がて、エンジン１が所定の回転数に達し、スロットルが
操作されると、その開度がスロットル開度検出器２４に
よって検出され、この開度に対応するメモリアドレスが
アクセスされて開閉切替データが読み出され、制御回路
２３へ供給される。制御回路２３は、エンジン回転数Ｎ
eと開閉切替データとを比較して、制御弁開度目標値を
全開または全閉とする。First, when the engine 1 is started, a pulse signal is supplied from the ignition device 21 to the rotation speed detection circuit 22, the engine rotation speed Ne is detected, and the engine rotation speed Ne is supplied to the control circuit 23. Eventually, when the engine 1 reaches a predetermined rotation speed and the throttle is operated, the opening degree is detected by the throttle opening degree detector 24, the memory address corresponding to this opening degree is accessed, and the opening / closing switching data is read. It is output and supplied to the control circuit 23. The control circuit 23 determines the engine speed N
The control valve opening target value is set to fully open or fully closed by comparing e with the open / close switching data.
上記制御弁開度目標値が全開の場合(これは一般に、エ
ンジン回転数Ｎeが拘束の場合である)、上記指令が制御
回路２３から駆動回路２７へ供給されると、駆動回路２
７はアクチュエータ１０を回転駆動する。これによっ
て、ウォームギヤ１９、駆動軸１５、出力軸１４、作動
レバー１３が順次作動され、両制御弁６が相互に離反す
る方向に移動され、排気通路４の開口３の上部が開放さ
れる。なお、この場合のアクチュエータ１０の回転量は
エンコーダ２８によって検出され、制御弁開度のフィー
ドバック制御が行なわれる。When the control valve opening target value is fully opened (this is generally the case where the engine speed Ne is restricted), when the command is supplied from the control circuit 23 to the drive circuit 27, the drive circuit 2
Reference numeral 7 drives the actuator 10 to rotate. As a result, the worm gear 19, the drive shaft 15, the output shaft 14, and the actuating lever 13 are sequentially actuated, both control valves 6 are moved in directions away from each other, and the upper portion of the opening 3 of the exhaust passage 4 is opened. The amount of rotation of the actuator 10 in this case is detected by the encoder 28, and feedback control of the control valve opening is performed.
一方、制御弁開度目標値が全閉の場合(すなわち、エン
ジン回転数Ｎeが低速の場合)、上記と逆の動作により制
御弁６が閉じられる。On the other hand, when the control valve opening target value is fully closed (that is, when the engine speed Ne is low), the control valve 6 is closed by the operation reverse to the above.
このように、低速回転時に制御弁６を閉位置にセツトす
ることにより、その制御面6aで排気通路４の開口３の上
部を閉塞して排気通路の開口の上端縁3aをその実際のレ
ベルL1から第３図に示すように、見掛け上、制御面6aの
下端縁6bのレベルL2に下げ、したがつて、シリンダ２の
内部と排気通路４とを連通させるピストンＰの位置が、
前記開口３の上端縁3aと制御面6aの下端縁6bとの距離分
（L1とL2との間隔分）下方にずれることにより、排気の
開始時期が遅延させられ、低速回転時における排気系が
適切な状態となされる。In this way, by setting the control valve 6 to the closed position during low-speed rotation, the control surface 6a closes the upper portion of the opening 3 of the exhaust passage 4 so that the upper edge 3a of the opening of the exhaust passage is set to the actual level L. As shown in FIG. 1 to FIG. 3, it is apparently lowered to the level L 2 of the lower end edge 6b of the control surface 6a, and accordingly, the position of the piston P for communicating the inside of the cylinder 2 and the exhaust passage 4 is
By shifting downward by the distance (the distance between L 1 and L 2 ) between the upper edge 3a of the opening 3 and the lower edge 6b of the control surface 6a, the start timing of the exhaust is delayed, and the exhaust at low speed rotation is delayed. The system is in proper condition.
一方、高速回転時に制御弁６を開放すると、シリンダ２
の内部と排気通路４とを連通させるピストンＰの位置
が、前記開口３の上端縁3aのレベルL1に上昇することに
より、排気の開始時期が早められて、高速回転時におけ
る排気系が適切な状態となされる。On the other hand, when the control valve 6 is opened during high-speed rotation, the cylinder 2
The position of the piston P that communicates the interior of the exhaust passage with the exhaust passage 4 rises to the level L 1 of the upper end edge 3a of the opening 3, whereby the start timing of exhaust is advanced and the exhaust system during high speed rotation is appropriate. It is made into a state.
こうして、本実施例においては、スロットル開度θthと
エンジン回転数Ｎeとの２変数によって制御弁６の開閉
制御を行うようにしたので、第６図に示すような滑らか
な出力カーブを得ることができる。In this way, in this embodiment, since the opening / closing control of the control valve 6 is performed by the two variables of the throttle opening θth and the engine speed Ne, it is possible to obtain a smooth output curve as shown in FIG. it can.
なお、本実施例の回転数検出回路２２は、波形整形回路
２２aと、Ｆ／Ｖ変換器２２bとで構成したが、これに限
定されることはない。例えば、波形整形回路とカウンタ
とで構成し、波形整形後の波形（パルス数）をカウント
し、このカウント値を制御回路２３へ供給し、これに基
づいて回転数を検出するようにしてもよい。The rotation speed detection circuit 22 of this embodiment is composed of the waveform shaping circuit 22a and the F / V converter 22b, but the invention is not limited to this. For example, it may be configured by a waveform shaping circuit and a counter to count the waveform (pulse number) after waveform shaping, supply this count value to the control circuit 23, and detect the rotation speed based on this. .
また、前記実施例において示した各構成部材の諸形状、
寸法あるいは駆動方法等は一例であつて、設計要求等に
基づき種々変更可能である。例えば、前記制御弁６はそ
の長さ方向沿つて移動させる例について説明したが、シ
リンダ２と排気管５との接続部近傍で開口３のシリンダ
２の周方向の側部に回動中心を有する作動レバーによつ
て、ピストンＰの移動方向と直交する面内で移動させる
ようにしてもよい。Further, various shapes of the respective constituent members shown in the above embodiment,
The dimensions, the driving method and the like are merely examples, and can be variously changed based on design requirements and the like. For example, the example in which the control valve 6 is moved along the length direction has been described, but the control valve 6 has a rotation center on the circumferential side portion of the cylinder 2 of the opening 3 in the vicinity of the connecting portion between the cylinder 2 and the exhaust pipe 5. The operating lever may be moved in a plane orthogonal to the moving direction of the piston P.
「発明の効果」 以上説明したように、本発明に係わる２サイクルエンジ
ンの排気時期制御弁駆動装置は、エンジンの回転数を検
出する回転数検出手段と、スロットルの開度を検出する
スロットル開度検出手段と、前記スロットルの各開度毎
に、制御弁の開閉切替を行うべきエンジン回転数を開閉
切替データとして記憶する記憶手段と、前記記憶手段か
ら読み出した開閉切替データによって前記制御弁の開閉
切替指令を出力する制御手段と、前記開閉切替指令に基
づいてアクチュエータを駆動して前記制御弁を開閉駆動
する駆動手段とを具備し、スロットルの開度とエンジン
回転数とに応じて制御弁の開度を調節するようにしたの
で、滑らかで良好なエンジン出力特性を得ることができ
る。[Advantages of the Invention] As described above, the exhaust timing control valve drive system for a two-cycle engine according to the present invention is provided with a rotation speed detecting means for detecting the rotation speed of the engine and a throttle opening degree for detecting the opening degree of the throttle. Opening and closing of the control valve by detecting means, storage means for storing the engine speed for opening and closing the control valve as opening and closing switching data for each opening of the throttle, and opening and closing switching data read from the storage means. A control means for outputting a switching command and a driving means for driving the actuator based on the opening / closing switching command to open / close the control valve are provided, and the control valve of the control valve is controlled according to the opening degree of the throttle and the engine speed. Since the opening is adjusted, it is possible to obtain a smooth and good engine output characteristic.
【図面の簡単な説明】 図面は本発明の実施例を示すもので、第１図は実施例が
適用されたエンジンの要部を断面した平面図、第２図は
第１図のII−II線に沿う矢視断面図、第３図は第１図の
III−III線に沿う矢視断面図、第４図は作動を説明する
ための第１図と同様の図、第５図は実施例の電気的構成
を示すブロック図、第６図は実施例の出力特性を示すグ
ラフ、第７図は従来のエンジンの出力特性を示すグラフ
である。 １……エンジン、２……シリンダ、2a……（シリンダ
の）内面、３……開口、3a……上端縁、４……排気通
路、６……制御弁、6a……制御面、6b……下端縁、７…
…（排気時期制御）弁駆動装置、10……アクチユエー
タ、11……動力伝達機構、22……回転数検出回路、23…
…制御回路、24……スロットル開度検出器、25……駆動
回路、26……メモリ(記憶手段)。BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention. FIG. 1 is a plan view of a cross section of a main part of an engine to which the embodiment is applied, and FIG. 2 is a II-II of FIG. FIG. 3 is a sectional view taken along the line of FIG.
A sectional view taken along the line III-III, FIG. 4 is a view similar to FIG. 1 for explaining the operation, FIG. 5 is a block diagram showing an electrical configuration of the embodiment, and FIG. 6 is an embodiment. FIG. 7 is a graph showing the output characteristic of the engine, and FIG. 7 is a graph showing the output characteristic of the conventional engine. 1 ... Engine, 2 ... Cylinder, 2a ... (Cylinder) inner surface, 3 ... Opening, 3a ... Upper edge, 4 ... Exhaust passage, 6 ... Control valve, 6a ... Control surface, 6b ... … Bottom edge, 7…
… (Exhaust timing control) Valve drive, 10 …… Actuator, 11 …… Power transmission mechanism, 22 …… Rotation speed detection circuit, 23…
… Control circuit, 24 …… Throttle opening detector, 25 …… Drive circuit, 26 …… Memory (storage means).
Claims (1)
られ該シリンダと連通した排気通路の開口上部を開閉す
る制御弁と、前記制御弁を開閉動させるための回転力を
出力するアクチユエータと、該アクチユエータから出力
される回転力を前記制御弁に伝達する動力伝達機構とを
有する２サイクルエンジン装置において、前記エンジン
の回転数を検出する回転数検出手段と、スロットルの開
度を検出するスロットル開度検出手段と、前記スロット
ルの各開度毎に、前記制御弁の開閉切替を行うべきエン
ジン回転数を開閉切替データとして記憶する記憶手段
と、前記記憶手段から読み出した開閉切替データによっ
て前記制御弁の開閉切替指令を出力する制御手段と、前
記開閉切替指令に基づいて前記アクチュエータを駆動し
て前記制御弁を開閉駆動させる駆動手段とを具備するこ
とを特徴とする２サイクルエンジンの排気時期制御弁駆
動装置。1. A control valve provided near a cylinder of a two-cycle engine for opening and closing an upper opening of an exhaust passage communicating with the cylinder, an actuator for outputting a rotational force for opening and closing the control valve, and the actuator. In a two-cycle engine device having a power transmission mechanism that transmits the rotational force output from the engine to the control valve, a rotational speed detection unit that detects the rotational speed of the engine and a throttle opening detection that detects the opening of the throttle. Means, storage means for storing, as opening / closing switching data, the engine speed at which opening / closing switching of the control valve is performed for each opening of the throttle, and opening / closing of the control valve based on opening / closing switching data read from the storage means. Control means for outputting a switching command, and driving the actuator based on the opening / closing switching command to open / close the control valve Exhaust timing control valve actuating device of a two-stroke engine, characterized by comprising driving means for moving.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60016272A JPH0635830B2 (en) | 1985-01-30 | 1985-01-30 | Exhaust timing control valve drive for 2-cycle engine |
| EP85306064A EP0174149B1 (en) | 1984-08-28 | 1985-08-27 | Two-stroke engine with variable port timing |
| US06/770,056 US4706617A (en) | 1984-08-28 | 1985-08-27 | Two-cycle engine |
| DE8585306064T DE3564982D1 (en) | 1984-08-28 | 1985-08-27 | Two-stroke engine with variable port timing |
| AU46838/85A AU581019B2 (en) | 1984-08-28 | 1985-08-28 | Two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60016272A JPH0635830B2 (en) | 1985-01-30 | 1985-01-30 | Exhaust timing control valve drive for 2-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61175227A JPS61175227A (en) | 1986-08-06 |
| JPH0635830B2 true JPH0635830B2 (en) | 1994-05-11 |
Family
ID=11911906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60016272A Expired - Lifetime JPH0635830B2 (en) | 1984-08-28 | 1985-01-30 | Exhaust timing control valve drive for 2-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0635830B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014054732A1 (en) | 2012-10-03 | 2014-04-10 | 株式会社Ihi | Uniflow scavenging 2-cycle engine |
-
1985
- 1985-01-30 JP JP60016272A patent/JPH0635830B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014054732A1 (en) | 2012-10-03 | 2014-04-10 | 株式会社Ihi | Uniflow scavenging 2-cycle engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61175227A (en) | 1986-08-06 |
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