JP2010180788A - Internal combustion engine having plasma igniter - Google Patents

Internal combustion engine having plasma igniter Download PDF

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JP2010180788A
JP2010180788A JP2009025313A JP2009025313A JP2010180788A JP 2010180788 A JP2010180788 A JP 2010180788A JP 2009025313 A JP2009025313 A JP 2009025313A JP 2009025313 A JP2009025313 A JP 2009025313A JP 2010180788 A JP2010180788 A JP 2010180788A
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ignition device
discharge
internal combustion
motoring
combustion engine
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JP5035262B2 (en
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Daichi Okumura
大地 奥村
Koichi Nakada
浩一 中田
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Toyota Motor Corp
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  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (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)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine having a plasma igniter capable of miniaturizing a power source part by lowering discharge voltage required in cold starting. <P>SOLUTION: In the cold starting when the engine temperature is the preset temperature or lower (Step 102), motoring is performing for starting discharge of the plasma igniter before starting fuel injection (Step 104), and an intake quantity is reduced more than after starting the fuel injection when performing the motoring (Step 103). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、プラズマ点火装置を備える内燃機関に関する。   The present invention relates to an internal combustion engine including a plasma ignition device.

内燃機関において、点火装置により気筒内全体の均質混合気又は気筒内の一部に存在する混合気を確実に着火させなければならない。しかしながら、点火ギャップに火花を発生させる一般的な点火装置は、混合気の一点を着火させるものであり、それほど高い着火性を有してはいない。   In an internal combustion engine, it is necessary to reliably ignite a homogeneous mixture in the entire cylinder or a mixture existing in a part of the cylinder by an ignition device. However, a general ignition device that generates a spark in the ignition gap ignites one point of the air-fuel mixture and does not have a very high ignitability.

着火性に優れた点火装置として、プラズマジェットを噴射するプラズマ点火装置が提案されている（例えば、特許文献１参照）。プラズマ点火装置は、絶縁体側壁により形成されたチャンバと、チャンバの一端側に配置された中心電極と、チャンバの他端側に配置された接地電極とを具備し、中心電極と接地電極との間に電圧を印加して発生させた放電によってチャンバ内のガスをプラズマ化させ、こうしてチャンバ内の高温高圧のプラズマをプラズマジェットとしてチャンバと気筒内とを連通する噴孔から噴射するものであり、プラズマジェットの断面積に相当する混合気の所定面積を同時に着火させることによって、高い着火性を実現することができる。   As an ignition device having excellent ignitability, a plasma ignition device that injects a plasma jet has been proposed (see, for example, Patent Document 1). The plasma ignition device includes a chamber formed by an insulator side wall, a center electrode disposed on one end side of the chamber, and a ground electrode disposed on the other end side of the chamber. The gas in the chamber is turned into plasma by the discharge generated by applying a voltage between them, and thus the high-temperature and high-pressure plasma in the chamber is injected as a plasma jet from the nozzle hole communicating between the chamber and the cylinder, High ignitability can be realized by simultaneously igniting a predetermined area of the air-fuel mixture corresponding to the cross-sectional area of the plasma jet.

特開平０６−０６６２３６JP 06-066236

このようなプラズマ点火装置において、冷間始動時にはチャンバ内の温度が低く、確実に放電を発生させるためには非常に高い放電電圧が必要とされ、この非常に高い放電電圧を発生させるためにプラズマ点火装置の電源部は大型化されていた。   In such a plasma ignition device, the temperature in the chamber is low at the time of cold start, and a very high discharge voltage is required to surely generate a discharge, and plasma is generated to generate this very high discharge voltage. The power unit of the ignition device has been enlarged.

従って、本発明の目的は、冷間始動時に必要な放電電圧を低くして電源部の小型化を可能としたプラズマ点火装置を備える内燃機関を提供することである。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an internal combustion engine including a plasma ignition device capable of reducing the discharge voltage required at the time of cold start and reducing the size of the power supply unit.

本発明による請求項１に記載のプラズマ点火装置を備える内燃機関は、機関温度が設定温度以下である場合の冷間始動時において、燃料噴射を開始する前にプラズマ点火装置の放電を開始するモータリングを実施し、前記モータリングの実施中には燃料噴射の開始後に比較して吸気量を減少させることを特徴とする。   An internal combustion engine comprising the plasma ignition device according to claim 1 of the present invention is a motor that starts discharge of the plasma ignition device before starting fuel injection during cold start when the engine temperature is equal to or lower than a set temperature. Ring, and the amount of intake air is reduced during the motoring compared to after the start of fuel injection.

本発明による請求項２に記載のプラズマ点火装置を備える内燃機関は、請求項１に記載のプラズマ点火装置を備える内燃機関において、前記モータリングの実施中には燃料噴射の開始後に比較してスロットル弁の開度を小さくして吸気量を減少させることを特徴とする。   An internal combustion engine comprising the plasma ignition device according to claim 2 according to the present invention is an internal combustion engine comprising the plasma ignition device according to claim 1, wherein the throttle is compared with that after the start of fuel injection during the motoring. It is characterized in that the intake amount is reduced by reducing the opening of the valve.

本発明による請求項３に記載のプラズマ点火装置を備える内燃機関は、請求項１に記載のプラズマ点火装置を備える内燃機関において、前記モータリングの実施中には燃料噴射の開始後に比較して吸気弁の閉弁時期を遅角して吸気量を減少させることを特徴とする。   An internal combustion engine comprising the plasma ignition device according to claim 3 according to the present invention is an internal combustion engine comprising the plasma ignition device according to claim 1, wherein the intake air is compared to after the start of fuel injection during the motoring. The intake air amount is decreased by retarding the valve closing timing.

本発明による請求項１に記載のプラズマ点火装置を備える内燃機関によれば、機関温度が設定温度以下である場合の冷間始動時において、燃料噴射を開始する前にプラズマ点火装置の放電を開始するモータリングを実施し、モータリングの実施中には燃料噴射の開始後に比較して吸気量を減少させるようにしている。モータリング中は燃焼が実施されないために吸気量を減少させても特に問題はなく、吸気量の減少により圧縮行程末期の筒内圧力が低くなって放電し易くなり、冷間始動時であっても、放電のために非常に高い電圧は必要なく、モータリング中の比較的低い電圧での放電によってプラズマ点火装置が暖機されれば、燃料噴射が開始されて吸気量が増量されても、放電電圧は比較的低いままで確実な放電が可能となるために、冷間始動時のための非常に高い放電電圧は必要なく、プラズマ点火装置の電源部の小型化が可能となる。   According to the internal combustion engine comprising the plasma ignition device according to claim 1 of the present invention, at the cold start when the engine temperature is equal to or lower than the set temperature, the discharge of the plasma ignition device is started before the fuel injection is started. The motoring is performed, and the intake air amount is decreased during the motoring as compared with after the start of fuel injection. Since no combustion is performed during motoring, there is no particular problem even if the intake air amount is reduced, and the reduction of the intake air amount decreases the in-cylinder pressure at the end of the compression stroke, and discharge tends to occur. However, a very high voltage is not necessary for the discharge, and if the plasma ignition device is warmed up by a discharge at a relatively low voltage during motoring, even if the fuel injection is started and the intake air amount is increased, Since the discharge voltage remains relatively low and reliable discharge is possible, a very high discharge voltage for cold start is not required, and the power source unit of the plasma ignition device can be downsized.

本発明による請求項２に記載のプラズマ点火装置を備える内燃機関によれば、請求項１に記載のプラズマ点火装置を備える内燃機関において、モータリングの実施中には燃料噴射の開始後に比較してスロットル弁の開度を小さくして吸気量を減少させている。   According to the internal combustion engine comprising the plasma ignition device according to claim 2 of the present invention, the internal combustion engine comprising the plasma ignition device according to claim 1 is compared with after the start of fuel injection during motoring. The intake amount is reduced by reducing the opening of the throttle valve.

本発明による請求項３に記載のプラズマ点火装置を備える内燃機関によれば、請求項１に記載のプラズマ点火装置を備える内燃機関において、モータリングの実施中には燃料噴射の開始後に比較して吸気弁の閉弁時期を遅角して筒内へ吸入された吸気の一部を吸気ポートへ戻すことにより吸気量を減少させている。また、吸気弁の閉弁時期の遅角により実圧縮比も低下するために、圧縮行程末期の筒内圧力はさらに低下し、モータリング中に必要な放電電圧をさらに低くすることができる。   According to an internal combustion engine comprising the plasma ignition device according to claim 3 of the present invention, the internal combustion engine comprising the plasma ignition device according to claim 1 is compared with after the start of fuel injection during motoring. The intake amount is reduced by delaying the closing timing of the intake valve and returning a part of the intake air drawn into the cylinder to the intake port. Further, since the actual compression ratio also decreases due to the delay of the closing timing of the intake valve, the in-cylinder pressure at the end of the compression stroke further decreases, and the discharge voltage required during motoring can be further decreased.

本発明による内燃機関に取り付けられるプラズマ点火装置を示す概略縦断面図である。It is a schematic longitudinal cross-sectional view which shows the plasma ignition apparatus attached to the internal combustion engine by this invention. 図１のプラズマ点火装置の先端部の拡大断面図である。It is an expanded sectional view of the front-end | tip part of the plasma ignition apparatus of FIG. 機関始動時の制御を示す第一フローチャートである。It is a 1st flowchart which shows the control at the time of engine starting. 機関始動時の制御を示す第二フローチャートである。It is a 2nd flowchart which shows the control at the time of engine starting.

図１は本発明による内燃機関に取り付けられるプラズマ点火装置を示す概略縦断面図である。同図において、１は点火装置の軸線方向に延在するように絶縁体２の側壁により形成されてプラズマを生成する円筒状のチャンバであり、３はチャンバ１の基端側に配置された中心電極であり、４はチャンバ１の先端側に配置された接地電極である。５はチャンバ１と気筒内とを連通する噴孔である。６は、接地電極４を電気的及び機械的に固定すると共に絶縁体２を覆う金属製のハウジングである。   FIG. 1 is a schematic longitudinal sectional view showing a plasma ignition device attached to an internal combustion engine according to the present invention. In the figure, 1 is a cylindrical chamber that is formed by a side wall of an insulator 2 so as to extend in the axial direction of the ignition device and generates plasma, and 3 is a center disposed on the base end side of the chamber 1. 4 is a ground electrode disposed on the front end side of the chamber 1. Reference numeral 5 denotes an injection hole that communicates the chamber 1 with the inside of the cylinder. A metal housing 6 fixes the ground electrode 4 electrically and mechanically and covers the insulator 2.

本実施形態においては、噴孔５は、接地電極４に形成されているが、これは本発明を限定するものではなく、絶縁体２とハウジング６とを貫通するように形成することも可能であり、また、接地電極４又は絶縁体２の形状によってはハウジング６だけを貫通するように形成することも可能である。   In the present embodiment, the nozzle hole 5 is formed in the ground electrode 4, but this does not limit the present invention, and can be formed to penetrate the insulator 2 and the housing 6. In addition, depending on the shape of the ground electrode 4 or the insulator 2, it can be formed so as to penetrate only the housing 6.

中心電極３及び接地電極４は、耐熱性と高い導電性とを有する金属、例えば、ステンレス等の鉄系金属、ニッケル系金属、又は、イリジウム系金属又はイリジウム合金とすることができる。中心電極３に対して接地電極４を絶縁するための絶縁体２の材質は、セラミックス（例えばアルミナセラミックス）とすることが好ましい。７は絶縁体２とハウジング６との間の隙間を密閉するための金属ガスケットである。   The center electrode 3 and the ground electrode 4 can be made of a metal having heat resistance and high conductivity, for example, an iron-based metal such as stainless steel, a nickel-based metal, an iridium-based metal, or an iridium alloy. The material of the insulator 2 for insulating the ground electrode 4 from the center electrode 3 is preferably ceramics (for example, alumina ceramics). 7 is a metal gasket for sealing a gap between the insulator 2 and the housing 6.

図２は図１の点火装置のチャンバ１近傍の拡大図である。チャンバ１内のガスをプラズマ化させるには、先ずは、中心電極３と接地電極４との間に高電圧を印加し、絶縁体２の側壁内面上に沿面放電Ｓ１を発生させる。こうして、チャンバ１内の沿面放電近傍のガス（混合気）をプラズマ化してイオン及び電子が生成されると、プラズマ化されたガスを通って比較的低い電圧での気中放電が可能となり、次いで、この気中放電Ｓ２を発生させる。   FIG. 2 is an enlarged view of the vicinity of the chamber 1 of the ignition device of FIG. In order to turn the gas in the chamber 1 into plasma, first, a high voltage is applied between the center electrode 3 and the ground electrode 4 to generate a creeping discharge S 1 on the inner surface of the side wall of the insulator 2. Thus, when ions and electrons are generated by converting the gas (mixture) in the vicinity of the creeping discharge in the chamber 1 into plasma, air discharge at a relatively low voltage is possible through the plasmaized gas, This air discharge S2 is generated.

こうして、気中放電Ｓ２によってチャンバ１内のガスの大部分がプラズマ化されると、チャンバ１内のガスは高温高圧となってプラズマジェットとして噴孔５から噴射され、気筒内の混合気を良好に着火させる。   Thus, when most of the gas in the chamber 1 is converted into plasma by the air discharge S2, the gas in the chamber 1 becomes high temperature and high pressure and is injected from the nozzle hole 5 as a plasma jet, and the mixture in the cylinder is excellent. Ignite.

ところで、沿面放電及び気中放電のいずれにおいても、冷間始動時のようにチャンバ１内の温度が低いと必要な放電電圧が非常に高くなり、前述のように沿面放電及び気中放電によりチャンバ１内のガスをプラズマ化する場合だけでなく、沿面放電又は気中放電だけによりチャンバ１内のガスをプラズマ化する場合においても、一般的には、冷間始動時に備えて非常に高い放電電圧を発生可能とするようにプラズマ点火装置の電源部は大型化されていた。   By the way, in any of the creeping discharge and the air discharge, the required discharge voltage becomes very high when the temperature in the chamber 1 is low as in the cold start, and the chamber is caused by the creeping discharge and the air discharge as described above. In general, not only when the gas in the chamber 1 is turned into plasma but also when the gas in the chamber 1 is turned into a plasma only by creeping discharge or air discharge, a very high discharge voltage is generally prepared for cold start. The power source portion of the plasma ignition device has been enlarged so that it can be generated.

これに対して本実施形態の内燃機関は、始動時において図３に示す第一フローチャートの制御を実施することにより冷間始動時に必要な放電電圧を比較的低くしてプラズマ点火装置の電源部の小型化を可能としている。第一フローチャートを以下に説明する。先ず、ステップ１０１において、始動時であるか否かが判断される。この判断が否定される時にはそのまま終了するが、肯定される時には、ステップ１０２において冷却水温ＴＨＷが設定温度ＴＨＷ１以下であるか否かが判断される。   On the other hand, the internal combustion engine of the present embodiment performs the control of the first flowchart shown in FIG. 3 at the time of starting to relatively reduce the discharge voltage required at the time of cold starting, Miniaturization is possible. The first flowchart will be described below. First, in step 101, it is determined whether or not it is a start time. When this determination is denied, the process is terminated as it is. When the determination is affirmed, it is determined at step 102 whether or not the coolant temperature THW is equal to or lower than the set temperature THW1.

ステップ１０２の判断が否定される時には温間始動時であり、プラズマ点火装置においてチャンバ１内に放電を発生させるのにそれほど高い電圧は必要なく、ステップ１０５において、スロットル弁の開度Ａは通常の始動時開度Ａ１とされ、ステップ１０６において、最初に始動する気筒から燃料噴射を開始し、燃料噴射を開始した気筒から点火時期においてプラズマ点火装置による点火を開始する。ここで、最初に始動する気筒とは、例えば、吸気非同期ポート噴射の場合には最初に膨張行程となると判断された気筒であり、吸気同期ポート噴射の場合には最初に吸気行程となると判断された気筒であり、吸気行程筒内噴射の場合には最初に吸気行程となると判断された気筒であり、圧縮行程筒内噴射の場合には最初に圧縮行程となると判断された気筒である。   When the determination in step 102 is negative, it is a warm start, and the plasma ignition device does not require a very high voltage to generate a discharge in the chamber 1, and in step 105, the opening A of the throttle valve is a normal value. The starting opening is set to A1, and in step 106, fuel injection is started from the cylinder to be started first, and ignition by the plasma ignition device is started at the ignition timing from the cylinder that has started fuel injection. Here, the cylinder that starts first is, for example, a cylinder that is first determined to be in the expansion stroke in the case of the intake asynchronous port injection, and is determined to be the intake stroke in the first case in the case of the intake synchronous port injection. In the case of the intake stroke in-cylinder injection, the cylinder is determined to be the intake stroke first, and in the case of the compression stroke in-cylinder injection, the cylinder is determined to be the compression stroke first.

しかしながら、ステップ１０２の判断が肯定される時には冷間始動時であり、チャンバ１内の温度が低いために、そのままでは小型化された電源部により発生可能な電圧ではチャンバ１内に放電を発生させることはできない。それにより、本フローチャートでは、ステップ１０３において、スロットル弁の開度Ａを通常の始動時開度Ａ１から設定量ａだけ小さくし、ステップ１０４において、燃料噴射を開始することなくスタータモータにより機関駆動して点火時期においてプラズマ点火装置のチャンバ１内の放電を開始するモータリングを実施する。   However, when the determination in step 102 is affirmative, it is a cold start and the temperature in the chamber 1 is low, so that a discharge can be generated in the chamber 1 at a voltage that can be generated by a miniaturized power supply unit. It is not possible. Accordingly, in this flowchart, in step 103, the throttle valve opening A is reduced by a set amount a from the normal starting opening A1, and in step 104, the engine is driven by the starter motor without starting fuel injection. Then, motoring for starting discharge in the chamber 1 of the plasma ignition device is performed at the ignition timing.

モータリング時においては、燃焼が実施されないためにスロットル弁の開度を小さくして吸気量を減少させても特に問題はなく、吸気量の減少により圧縮行程末期の点火時期における筒内圧力が低くなって放電し易くなるために、冷間始動時であっても、小型化された電源部により発生可能な電圧によりプラズマ点火装置のチャンバ１内に放電を発生させることができる。   During motoring, since combustion is not performed, there is no particular problem even if the throttle valve opening is reduced to reduce the intake air amount, and the in-cylinder pressure at the ignition timing at the end of the compression stroke is lowered due to the reduction of the intake air amount. Therefore, even during cold start, a discharge can be generated in the chamber 1 of the plasma ignition device by a voltage that can be generated by the miniaturized power supply unit.

こうして、各気筒において数回の点火時期での放電が実施されれば、各プラズマ点火装置のチャンバ１内の温度が高まり、筒内圧力が高くても小型化された電源部により発生可能な電圧でプラズマ点火装置のチャンバ１内に放電を発生させることができるようになり、ステップ１０５において、スロットル弁の開度Ａは通常の始動時開度Ａ１とされ、ステップ１０６において燃料噴射時期（例えば、吸気非同期ポート噴射の場合には膨張行程、吸気同期ポート噴射の場合には吸気行程、筒内噴射の場合には吸気行程又は圧縮行程）となっている気筒から燃料噴射を開始し、圧縮行程末期の点火時期においてプラズマ点火装置の点火を開始する。   Thus, if the discharge at several ignition timings is performed in each cylinder, the temperature in the chamber 1 of each plasma ignition device increases, and the voltage that can be generated by the reduced power supply unit even if the in-cylinder pressure is high. Thus, discharge can be generated in the chamber 1 of the plasma ignition device. In step 105, the opening A of the throttle valve is set to the normal starting opening A1, and in step 106, the fuel injection timing (for example, In the case of intake asynchronous port injection, fuel injection is started from the cylinder that is in the expansion stroke, in the case of intake synchronous port injection, the intake stroke, and in the case of in-cylinder injection, the end of the compression stroke. The ignition of the plasma ignition device is started at the ignition timing.

このような制御により、冷間始動時であっても、放電のために非常に高い電圧は必要なく、プラズマ点火装置の電源部の小型化が可能となる。第一フローチャートにおいて、スロットル弁の始動時開度Ａ１は、早期暖機のために、温間始動時に比較して冷間始動時（ＴＨＷ＜＝ＴＨＷ１）には大きくするようにしても良く、また、冷却水温ＴＨＷが低いほど大きくするようにしても良い。   Such a control does not require a very high voltage for discharging even during cold start, and allows the power source unit of the plasma ignition device to be downsized. In the first flowchart, the opening A1 at the time of starting the throttle valve may be set larger at the time of cold start (THW <= THW1) than at the time of warm start for early warm-up. The lower the coolant temperature THW, the larger the temperature may be.

図４は、図３に代えて実施される第二フローチャートであり、第一フローチャートとの違いについてのみ以下に説明する。第二フローチャートにおいては、ステップ２０３において、吸気弁の閉弁時期ＶＣは、通常の始動時閉弁時期ＶＣ１から設定値ｂだけ遅角しており、また、温間始動時及びモータリングの終了後には、ステップ２０５において、吸気弁の閉弁時期ＶＣは通常の始動時閉弁時期ＶＣ１としている。   FIG. 4 is a second flowchart implemented in place of FIG. 3, and only differences from the first flowchart will be described below. In the second flowchart, in step 203, the closing timing VC of the intake valve is retarded by the set value b from the normal starting closing timing VC1, and at the time of warm starting and after the end of motoring. In step 205, the intake valve closing timing VC is set to the normal starting valve closing timing VC1.

それにより、モータリング時においては、吸気弁の閉弁時期の遅角により、一部の吸気が吸気ポートへ戻されて吸気量が減少し、圧縮行程末期の点火時期における筒内圧力が低くなることに加えて、実圧縮比も低下して圧縮行程末期の点火時期における筒内圧力がさらに低くなって、さらに放電し易くなるために、冷間始動時であっても、さらに低い電圧でプラズマ点火装置のチャンバ１内に放電を発生させることができる。こうして、第二フローチャートの制御によれば、プラズマ点火装置の電源部のさらなる小型化も可能となる。   As a result, during motoring, due to the delay in the closing timing of the intake valve, a portion of the intake air is returned to the intake port and the intake air amount decreases, and the in-cylinder pressure at the ignition timing at the end of the compression stroke decreases. In addition, since the actual compression ratio also decreases and the in-cylinder pressure at the ignition timing at the end of the compression stroke becomes lower and discharge becomes easier, plasma is generated at a lower voltage even during cold start. A discharge can be generated in the chamber 1 of the ignition device. Thus, according to the control of the second flowchart, the power supply unit of the plasma ignition device can be further reduced in size.

第二フローチャートにおいて、可変動弁機構によっては、吸気弁の閉弁時期ＶＣの遅角と同時に吸気弁の開弁時期も遅角されることとなるが、例えば、吸気弁が電磁又は油圧アクチュエータ等により駆動される場合には、吸気弁の閉弁時期だけを遅角するようにすることも可能である。   In the second flowchart, depending on the variable valve mechanism, the intake valve opening timing is also delayed at the same time as the intake valve closing timing VC. For example, the intake valve may be an electromagnetic or hydraulic actuator or the like. It is also possible to retard only the valve closing timing of the intake valve.

第一及び第二フローチャートの制御において、モータリング中におけるプラズマ点火装置の放電は、圧縮行程末期の点火時期だけとしたが、さらに、圧縮行程末期以外の時期（吸気行程、末期を除く圧縮行程、膨張行程、排気行程）は点火時期より筒内圧力が低く放電し易いために、追加してプラズマ点火装置の放電を実施しても良く、それにより、プラズマ点火装置のチャンバ１内の温度を早期に高めることができ、モータリング期間を短縮することができる。   In the control of the first and second flowcharts, the discharge of the plasma ignition device during motoring is only the ignition timing at the end of the compression stroke, but further, the timing other than the end of the compression stroke (the intake stroke, the compression stroke excluding the end, In the expansion stroke and the exhaust stroke), since the in-cylinder pressure is lower than the ignition timing and discharge is easy, the discharge of the plasma ignition device may be additionally performed, so that the temperature in the chamber 1 of the plasma ignition device is increased early. The motoring period can be shortened.

また、モーリング中においては、排気弁を閉弁させたままとすることが好ましい。それにより、圧縮行程において圧縮して温度を高めた筒内の吸気は、排気系に排出せず、排気行程末期の吸気弁の開弁により吸気系へ逆流するが、吸気行程において再び筒内へ吸入され次の圧縮行程において再び圧縮されて温度がさらに高められ、このように高められた吸気温度によりプラズマ点火装置のチャンバ１内の温度を早期に高めることができ、モータリング期間を短縮することができる。   Further, it is preferable to keep the exhaust valve closed during the mooring. As a result, the intake air in the cylinder, which has been compressed during the compression stroke and whose temperature has been increased, is not discharged into the exhaust system, but flows back into the intake system due to the opening of the intake valve at the end of the exhaust stroke. The air is sucked and compressed again in the next compression stroke to further increase the temperature, and the temperature in the chamber 1 of the plasma ignition device can be increased early by the intake air temperature thus increased, and the motoring period can be shortened. Can do.

また、モータリング中において吸気弁及び排気弁がいずれも開弁するバルブオーバーラップ期間を長くするようにすれば、圧縮行程において圧縮により温度が高められた吸気は、吸気系へ逆流して再び筒内へ吸入され、また、排気系へ排出しても一部は筒内へ戻され、筒内へ残留する量が増大するために、次の圧縮行程において再び圧縮されて温度がさらに高められ、このように高められた吸気温度によりプラズマ点火装置のチャンバ１内の温度を早期に高めることができ、モータリング期間を短縮することができる。   In addition, if the valve overlap period during which both the intake valve and the exhaust valve are opened during motoring is lengthened, the intake air whose temperature has been increased by the compression in the compression stroke flows back to the intake system and again becomes a cylinder. Even if it is sucked in and exhausted to the exhaust system, a part of it is returned into the cylinder, and the amount remaining in the cylinder increases, so that it is compressed again in the next compression stroke, and the temperature is further increased. The intake air temperature thus increased can raise the temperature in the chamber 1 of the plasma ignition device at an early stage, and the motoring period can be shortened.

１ チャンバ
２ 絶縁体
３ 中心電極
４ 接地電極
５ 噴孔 DESCRIPTION OF SYMBOLS 1 Chamber 2 Insulator 3 Center electrode 4 Ground electrode 5 Injection hole

Claims (3)

機関温度が設定温度以下である場合の冷間始動時において、燃料噴射を開始する前にプラズマ点火装置の放電を開始するモータリングを実施し、前記モータリングの実施中には燃料噴射の開始後に比較して吸気量を減少させることを特徴とするプラズマ点火装置を備える内燃機関。   At the time of cold start when the engine temperature is equal to or lower than the set temperature, motoring for starting the discharge of the plasma ignition device is performed before starting fuel injection, and after the start of fuel injection during the motoring, An internal combustion engine comprising a plasma ignition device characterized in that the intake air amount is reduced in comparison. 前記モータリングの実施中には燃料噴射の開始後に比較してスロットル弁の開度を小さくして吸気量を減少させることを特徴とする請求項１に記載のプラズマ点火装置を備える内燃機関。   2. The internal combustion engine having a plasma ignition device according to claim 1, wherein during the motoring, the amount of intake air is reduced by making the opening of the throttle valve smaller than after the start of fuel injection. 前記モータリングの実施中には燃料噴射の開始後に比較して吸気弁の閉弁時期を遅角して吸気量を減少させることを特徴とする請求項１に記載のプラズマ点火装置を備える内燃機関。   2. The internal combustion engine having a plasma ignition device according to claim 1, wherein during the motoring, the intake air amount is decreased by retarding a closing timing of the intake valve as compared with after the start of fuel injection. .
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