JPH10318001A - Valve control system for exhaust turbo charged internal combustion engine - Google Patents
Valve control system for exhaust turbo charged internal combustion engineInfo
- Publication number
- JPH10318001A JPH10318001A JP14715297A JP14715297A JPH10318001A JP H10318001 A JPH10318001 A JP H10318001A JP 14715297 A JP14715297 A JP 14715297A JP 14715297 A JP14715297 A JP 14715297A JP H10318001 A JPH10318001 A JP H10318001A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- exhaust
- internal combustion
- combustion engine
- intake
- 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.)
- Granted
Links
Classifications
-
- 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
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Supercharger (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はターボ過給機付き内
燃機関の動弁制御システムに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve control system for an internal combustion engine with a turbocharger.
【０００２】[0002]
【従来の技術】ターボ過給機付き内燃機関においては、
発進加速時などには、ターボ過給機の回転上昇の遅れが
あるために、過給圧の上昇が遅れるとともに、排気ター
ビン側の流れの停滞により排圧が上昇する。これらの結
果、発進加速時には過給圧に比べて排圧が大幅に高くな
る現象が生じる。図１４に示すように定常運転すなわち
エンジンおよびターボ過給機の回転数が一定のときに
は、ほぼ全域で過給圧に対して排圧は＋１００mmHg程度
であるのに対して、発進加速時には、過給圧１００mmHg
のとき排圧は４００mmHgで両者の差圧は３００mmHgであ
り、さらに過給圧５００mmHgのとき排圧は１１００mmHg
で差圧は６００mmHgと、定常運転時の差圧に比べて３〜
６倍に達していることがわかる。2. Description of the Related Art In an internal combustion engine with a turbocharger,
At the time of starting acceleration or the like, there is a delay in the rise of the rotation of the turbocharger, so that the rise of the supercharging pressure is delayed and the exhaust pressure rises due to the stagnation of the flow on the exhaust turbine side. As a result, during start acceleration, a phenomenon occurs in which the exhaust pressure is significantly higher than the supercharging pressure. As shown in FIG. 14, the exhaust pressure is about +100 mmHg with respect to the supercharging pressure in almost all regions during steady operation, that is, when the rotation speeds of the engine and the turbocharger are constant. Pressure 100mmHg
At 400 mmHg, the differential pressure between them is 300 mmHg, and when the supercharging pressure is 500 mmHg, the exhaust pressure is 1100 mmHg.
And the differential pressure is 600mmHg, which is 3 ~
It turns out that it has reached 6 times.
【０００３】[0003]
【発明が解決しようとする課題】このように過給圧に比
べて排圧が大幅に高くなったとき、吸排気弁のバルブオ
ーバーラップが大きいと残留ガス量が増大してノックを
発生したり、充填効率が低下して出力が低下するなどの
問題が生じる。このためターボ仕様ではオーバーラップ
を小さく設定するのが一般的である。しかしその必要性
が高いのは発進加速時などの過渡時であり、定常時には
逆にある程度のオーバーラップを設定しておかないと、
吸排気上死点前後のバルブリフトを十分にとれず吸排ロ
スが大きくなり、定格出力が低下するという問題があっ
た。かかる問題点には従来の固定動弁方式で対応するの
は困難である。As described above, when the exhaust pressure is significantly higher than the supercharging pressure, if the valve overlap of the intake and exhaust valves is large, the residual gas amount increases and knocks may occur. This causes problems such as a decrease in filling efficiency and a decrease in output. For this reason, in the turbo specification, the overlap is generally set to be small. However, the necessity is high during transitions such as during start-up acceleration, and in the steady state, conversely, unless some overlap is set,
There was a problem that the valve lift before and after the top dead center of the intake and exhaust could not be sufficiently taken, so that the intake and exhaust loss increased and the rated output decreased. It is difficult to cope with such a problem by the conventional fixed valve system.
【０００４】本発明は上記問題点に鑑みてなされたもの
で、発進加速時などの過渡運転時において、シリンダ内
への残留ガス量の逆流を抑え、耐ノック性を向上させる
とともに充填効率を向上させて出力増加を図ることがで
きるターボ過給機付き内燃機関の動弁制御システムを提
供することを目的とする。The present invention has been made in view of the above problems, and suppresses the backflow of the residual gas amount into the cylinder during transient operation such as starting acceleration, thereby improving knock resistance and improving charging efficiency. It is an object of the present invention to provide a valve operating control system for an internal combustion engine with a turbocharger that can increase the output by increasing the output.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の本発明のターボ過給機付き内燃機関
の動弁制御システムは、作動角を連続可変制御して吸気
弁及び／又は排気弁の開閉時期を変化させる可変動弁制
御機構を備え、機関のアイドリング時には前記吸排気弁
のバルブオーバーラップを減少させるように制御される
ターボ過給機付き内燃機関において、加速の過渡運転条
件を検出する過渡運転条件検出手段を備え、過渡運転条
件が検出された時には前記吸排気弁のオーバーラップを
定常運転での同一負荷，同一回転数の運転条件における
設定値よりも小さくするように制御することを特徴とす
る。In order to achieve the above object, a valve operating control system for an internal combustion engine with a turbocharger according to the first aspect of the present invention is characterized in that the operating angle is continuously variably controlled to control the intake valve and the intake valve. In an internal combustion engine equipped with a turbocharger, which has a variable valve control mechanism for changing the opening / closing timing of an exhaust valve and is controlled so as to reduce the valve overlap of the intake and exhaust valves at the time of idling of the engine, the acceleration transient A transient operating condition detecting means for detecting an operating condition, wherein when the transient operating condition is detected, the overlap of the intake and exhaust valves is made smaller than a set value under the operating condition of the same load and the same speed in the steady operation. Is controlled.
【０００６】この請求項１記載のターボ過給機付き内燃
機関の動弁制御システムでは、発進加速時などの過渡運
転条件が検出された時には吸排気弁のオーバーラップを
小さくするように制御する。すなわち発進加速時などに
はターボ過給機の回転上昇が遅れるため、排圧が増大
し、シリンダ内に残留ガスが逆流しやすくなるが、本発
明ではオーバーラップを小さくすることで、残留ガス量
を抑えるようにする。これにより耐ノック性を向上させ
るとともに充填効率向上による出力増加が図られる。In the valve control system for an internal combustion engine with a turbocharger according to the first aspect, when a transient operation condition such as start acceleration is detected, the overlap of the intake and exhaust valves is controlled to be small. That is, during start-up acceleration, etc., the rise in the rotation of the turbocharger is delayed, so that the exhaust pressure increases and the residual gas easily flows back into the cylinder. However, in the present invention, by reducing the overlap, the residual gas amount is reduced. Try to suppress. As a result, the knock resistance is improved, and the output is increased by improving the filling efficiency.
【０００７】請求項１記載のターボ過給機付き内燃機関
の動弁制御システムにおいて、オーバーラップを小さく
するためには吸気弁の開弁時期を遅らせるか又は排気弁
の閉弁時期を早めるように制御することとなるが、その
具体的内容は特に限定されず、搭載されている弁駆動機
構に応じて決定することができる。なかでも請求項２記
載のターボ過給機付き内燃機関の動弁制御システムは、
機関のアイドリング時には吸気弁の作動角を小さくして
吸気弁の開弁時期を排気行程末期又は吸入行程初期まで
遅らせるとともに吸気弁の閉弁時期を圧縮下死点側に早
めるように制御され、前記過渡運転条件が検出された時
には吸気弁の作動角の拡大を遅らせるように制御される
ことを特徴とする。In the valve operating control system for an internal combustion engine with a turbocharger according to the first aspect, the opening timing of the intake valve is delayed or the closing timing of the exhaust valve is advanced in order to reduce the overlap. Although the control is performed, the specific contents are not particularly limited, and can be determined according to the mounted valve drive mechanism. In particular, the valve control system for an internal combustion engine with a turbocharger according to claim 2 is:
When the engine is idling, the opening angle of the intake valve is controlled to decrease the operating angle of the intake valve to delay the opening timing of the intake valve until the end of the exhaust stroke or the beginning of the intake stroke, and to advance the closing timing of the intake valve to the compression bottom dead center side. When a transient operation condition is detected, control is performed to delay the expansion of the operating angle of the intake valve.
【０００８】この請求項２記載のターボ過給機付き内燃
機関の動弁制御システムでは、前記過渡運転条件が検出
された時には、吸気弁の作動角の拡大を遅らせること
で、吸気弁の実質的な開弁時期を遅らせて、オーバーラ
ップを小さくしている。In the valve control system for an internal combustion engine with a turbocharger according to the present invention, when the transient operating condition is detected, the expansion of the operating angle of the intake valve is delayed to substantially reduce the intake valve. The valve opening timing is delayed to reduce the overlap.
【０００９】また請求項３記載のターボ過給機付き内燃
機関の動弁制御システムは、機関のアイドリング時には
排気弁の作動角を小さくして排気弁の閉弁時期を吸入行
程初期又は排気行程末期まで早めるように制御され、前
記過渡運転条件が検出された時には排気弁の作動角の拡
大を遅らせるように制御されることを特徴とする。According to a third aspect of the present invention, in the valve operating system for an internal combustion engine with a turbocharger, when the engine is idling, the operating angle of the exhaust valve is reduced so that the closing timing of the exhaust valve is set at the beginning of the intake stroke or at the end of the exhaust stroke. , And when the transient operation condition is detected, control is performed to delay the expansion of the operating angle of the exhaust valve.
【００１０】この請求項３記載のターボ過給機付き内燃
機関の動弁制御システムでは、前記過渡運転条件が検出
された時には、排気弁の作動角の拡大を遅らせること
で、排気弁の実質的な閉弁時期を早め、オーバーラップ
を小さくしている。In the valve control system for an internal combustion engine with a turbocharger according to the third aspect, when the transient operation condition is detected, the expansion of the operating angle of the exhaust valve is delayed to substantially reduce the exhaust valve. The valve closing time is advanced and the overlap is reduced.
【００１１】請求項１乃至３記載のターボ過給機付き内
燃機関の動弁制御システムにおいて、吸気弁又は排気弁
の作動角を連続可変制御する手段は、種々に改変するこ
とができる。例えば、請求項４記載のターボ過給機付き
内燃機関の動弁制御システムは、前記吸気弁又は排気弁
の作動角を連続可変制御する手段は、機関の回転に同期
して回転する駆動軸と、この駆動軸と同軸上に配設さ
れ、かつ吸気弁又は排気弁を駆動するカムを外周に有す
るカムシャフトと、このカムシャフトの端部に設けら
れ、かつ半径方向に沿って係合溝が形成された一方のフ
ランジ部と、この一方のフランジ部に対向するように前
記駆動軸側に設けられ、かつ半径方向に沿って係合溝が
形成された他方のフランジ部と、上記両フランジ部の間
に揺動自在に配設された環状ディスクと、この環状ディ
スクの両側部に互いに反対方向に突設されて、上記両フ
ランジ部の各係合溝内に各々係合するピンと、前記環状
ディスクを機関の運転状態に応じて揺動させる駆動機構
とを備えたことを特徴とする。In the valve control system for an internal combustion engine with a turbocharger according to any one of the first to third aspects, the means for continuously variably controlling the operating angle of the intake valve or the exhaust valve can be variously modified. For example, in the valve control system for an internal combustion engine with a turbocharger according to claim 4, the means for continuously variably controlling the operating angle of the intake valve or the exhaust valve includes a drive shaft that rotates in synchronization with the rotation of the engine. A camshaft disposed coaxially with the drive shaft and having a cam for driving an intake valve or an exhaust valve on the outer periphery thereof; and an engagement groove provided at an end of the camshaft and extending in a radial direction. One of the formed flange portions, the other flange portion provided on the drive shaft side so as to face the one flange portion, and having an engagement groove formed in a radial direction; An annular disk swingably disposed between the annular disk, pins protruding from both sides of the annular disk in opposite directions to engage in respective engagement grooves of the flange portions, Depending on the operating condition of the engine Characterized in that a drive mechanism for moving.
【００１２】この請求項４記載のターボ過給機付き内燃
機関の動弁制御システムでは、運転条件に対応して吸排
気弁の作動角を変化させ、吸排気弁の開閉時期を変化さ
せ、オーバーラップを変化させる。閉時期又は開時期の
みを大きく変化させる可変制御も可能となり、従来のカ
ムの位相差制御のような作動角が変化しない方式とは大
きく異なった動作をする。In the valve operating control system for an internal combustion engine with a turbocharger according to the fourth aspect, the operating angle of the intake / exhaust valve is changed according to the operating condition, and the opening / closing timing of the intake / exhaust valve is changed. Change the lap. Variable control in which only the closing timing or the opening timing is greatly changed is also possible, and the operation is significantly different from the conventional system in which the operating angle does not change, such as the phase difference control of the cam.
【００１３】請求項１乃至４記載のターボ過給機付き内
燃機関の動弁制御システムにおいて、過渡運転条件を検
出する手段は、種々に改変することができる。例えば、
請求項５記載のターボ過給機付き内燃機関の動弁制御シ
ステムでは、前記過渡運転条件検出手段は、吸気弁上流
の圧力を検出する過給圧力検出手段と、この過給圧力検
出手段で検出した過給圧を定常運転での同一負荷，同一
回転数の運転条件における過給圧と比較する比較手段と
からなる。In the valve control system for an internal combustion engine with a turbocharger according to any one of claims 1 to 4, means for detecting a transient operation condition can be modified in various ways. For example,
6. The valve operating control system for an internal combustion engine with a turbocharger according to claim 5, wherein the transient operating condition detecting means detects the pressure upstream of the intake valve and the supercharging pressure detecting means. And a comparing means for comparing the obtained boost pressure with the boost pressure under the operating conditions of the same load and the same rotational speed in the steady operation.
【００１４】また請求項６記載のターボ過給機付き内燃
機関の動弁制御システムでは、前記過渡運転条件検出手
段は、ターボ過給機の排気タービンの上流の圧力を検出
する排気圧力検出手段と、この排気圧力検出手段で検出
した排気圧を定常運転での同一負荷，同一回転数の運転
条件における排気圧と比較する比較手段とからなる。In the valve control system for an internal combustion engine with a turbocharger, the transient operating condition detecting means may include an exhaust pressure detecting means for detecting a pressure upstream of an exhaust turbine of the turbocharger. And a comparing means for comparing the exhaust pressure detected by the exhaust pressure detecting means with the exhaust pressure under the operating conditions of the same load and the same rotational speed in the steady operation.
【００１５】また請求項７記載のターボ過給機付き内燃
機関の動弁制御システムでは、前記過渡運転条件検出手
段は、吸気弁上流の圧力を検出する過給圧力検出手段
と、ターボ過給機の排気タービンの上流の圧力を検出す
る排気圧力検出手段とを備えてなる。Further, in the valve control system for an internal combustion engine with a turbocharger according to claim 7, the transient operating condition detecting means includes a supercharging pressure detecting means for detecting a pressure upstream of an intake valve, and a turbocharger. Exhaust pressure detecting means for detecting the pressure upstream of the exhaust turbine.
【００１６】さらに請求項８記載のターボ過給機付き内
燃機関の動弁制御システムでは、前記過渡運転条件検出
手段は、吸気絞り弁の開度を検出する絞り弁開度検出手
段を有し、絞り弁の開度の変化から過渡運転条件を検出
することを特徴とする。Further, in the valve operating control system for an internal combustion engine with a turbocharger according to claim 8, the transient operating condition detecting means includes a throttle valve opening detecting means for detecting an opening of an intake throttle valve. A transient operation condition is detected from a change in the opening degree of the throttle valve.
【００１７】これら請求項５乃至８記載のターボ過給機
付き内燃機関の動弁制御システムでは、過渡運転条件が
検出されたときに吸排気弁のオーバーラップを小さくす
るように制御する。In the valve operating control system for an internal combustion engine with a turbocharger according to the fifth to eighth aspects, when the transient operation condition is detected, the overlap of the intake and exhaust valves is controlled to be small.
【００１８】[0018]
【発明の効果】請求項１乃至８記載のターボ過給機付き
内燃機関の動弁制御システムによれば、発進加速時など
の過渡運転条件が検出された時には吸排気弁のオーバー
ラップを小さくするように制御するので、ターボ過給機
の回転上昇遅れにともなって排圧が高くなっても、シリ
ンダ内への残留ガス量の逆流を抑えることができる。こ
れにより耐ノック性を向上させるとともに充填効率向上
による出力増加を図ることができる。According to the valve control system for an internal combustion engine with a turbocharger according to any one of the first to eighth aspects, the overlap between the intake and exhaust valves is reduced when a transient operation condition such as starting acceleration is detected. Thus, even if the exhaust pressure increases due to a delay in the rotation of the turbocharger, the backflow of the residual gas amount into the cylinder can be suppressed. As a result, the knock resistance can be improved, and the output can be increased by improving the charging efficiency.
【００１９】[0019]
【発明の実施の形態】以下、添付図面を参照して本発明
に係るターボ過給機付き内燃機関の動弁制御システムの
実施形態を説明する。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a valve control system for an internal combustion engine with a turbocharger according to the present invention.
【００２０】図１は、本発明の動弁制御システムを備え
た内燃機関の構成を示す模式図である。FIG. 1 is a schematic diagram showing the configuration of an internal combustion engine provided with a valve train control system according to the present invention.
【００２１】図示の通りこの内燃機関では、吸気系にお
いてコンプレッサ１と吸気弁２との間の圧力を検出する
過給圧センサ３が備えられるとともに、排気系側には排
気弁４と排気タービン５との間の圧力を検出する排圧セ
ンサ６が備えられており、これらの検出圧力はコントロ
ールユニット７に入力されている。コントロールユニッ
ト７には内燃機関の回転数や冷却水温，油圧などの運転
条件が入力され、内部に記憶されたマップに従って、後
述するアクチュータ８を駆動制御する。なお９は排気バ
イパス弁（ウエストゲートバルブ）である。As shown in the figure, the internal combustion engine is provided with a supercharging pressure sensor 3 for detecting the pressure between the compressor 1 and the intake valve 2 in the intake system, and an exhaust valve 4 and an exhaust turbine 5 on the exhaust system side. And an exhaust pressure sensor 6 for detecting the pressure between them is provided. These detected pressures are input to the control unit 7. Operating conditions such as the rotation speed of the internal combustion engine, cooling water temperature, and oil pressure are input to the control unit 7, and drive control of an actuator 8 described later is performed according to a map stored therein. Reference numeral 9 denotes an exhaust bypass valve (a waste gate valve).
【００２２】図２は、吸気弁の作動角を連続可変制御す
るための動弁機構を示す斜視図である。FIG. 2 is a perspective view showing a valve operating mechanism for continuously and variably controlling the operating angle of the intake valve.
【００２３】図示の通りこの機構は、機関の回転に同期
して回転する駆動軸１０と、駆動軸１０と同軸上に配設
され、かつ吸気弁１１を駆動するカム１２を外周に有す
るカムシャフト１３と、カムシャフト１３の端部に設け
られ、かつ半径方向に沿って係合溝１４ａが形成された
一方のフランジ部１４と、この一方のフランジ部に対向
するように前記駆動軸１０側に設けられ、かつ半径方向
に沿って係合溝１５ａが形成された他方のフランジ部１
５と、両フランジ部１４，１５の間に揺動自在に配設さ
れた環状ディスク１６と、環状ディスク１６の両側部に
互いに反対方向に突設されて、上記両フランジ部１４，
１５の各係合溝１４ａ，１５ａ内に各々係合するピン１
７，１８と、環状ディスク１６を機関の運転状態に応じ
て揺動させる偏心カム１９と、偏心カム１９をコントロ
ールシャフト２０を介して回転させるアクチュータ８と
から構成されている。As shown, this mechanism comprises a drive shaft 10 which rotates in synchronization with the rotation of the engine, and a camshaft which is disposed coaxially with the drive shaft 10 and has a cam 12 for driving an intake valve 11 on its outer periphery. 13, one flange portion 14 provided at an end portion of the camshaft 13 and having an engagement groove 14a formed in a radial direction, and the drive shaft 10 side facing the one flange portion. The other flange portion 1 provided and having an engagement groove 15a formed along the radial direction
5, an annular disk 16 slidably disposed between the two flange portions 14, 15, and projecting from opposite sides of the annular disk 16 in opposite directions to each other.
The pins 1 respectively engaged in the respective engagement grooves 14a, 15a
The eccentric cam 19 swings the annular disk 16 in accordance with the operating state of the engine, and the actuator 8 rotates the eccentric cam 19 via a control shaft 20.
【００２４】この機構では、アクチュータ８を駆動する
と環状ディスク１６の中心位置が駆動軸１０に対して揺
動し、環状ディスク１６による駆動軸１０からカムシャ
フト１３への回転の伝達がいわゆる不等速継手のように
作用して、カムの作動角を図３のように大きくしたり小
さくしたりすることができる。アクチュータ８の駆動は
図４のフローチャートに従って行われ、過給圧センサ３
および排圧センサ６の検出圧力から発進加速等の過渡運
転条件を検出すると、あらかじめ記憶された過渡運転の
マップに切換えて吸気弁の開閉時期を制御する。In this mechanism, when the actuator 8 is driven, the center position of the annular disk 16 swings with respect to the drive shaft 10, and the transmission of rotation from the drive shaft 10 to the camshaft 13 by the annular disk 16 is a so-called non-uniform speed. Acting like a joint, the working angle of the cam can be increased or decreased as shown in FIG. Driving of the actuator 8 is performed according to the flowchart of FIG.
When a transient operation condition such as starting acceleration is detected from the detected pressure of the exhaust pressure sensor 6, the switching to the transient operation map stored in advance is performed to control the opening / closing timing of the intake valve.
【００２５】図５にバルブリフト制御特性を示す。図示
の通り本実施形態では吸気弁のみについて開閉時期を可
変制御するようにしており、発進加速中の吸気弁の作動
角を定常時に比べて小さく抑えるように制御している。FIG. 5 shows valve lift control characteristics. As shown in the figure, in this embodiment, the opening / closing timing of only the intake valve is variably controlled, and the operating angle of the intake valve during start acceleration is controlled to be smaller than that in a steady state.
【００２６】図６は定常時における吸気弁の閉時期特性
を示している。通常の固定動弁方式の場合、運転条件に
かかわらず吸気弁の閉時期は下死点後（ＡＢＤＣ）５０
゜前後に設定され、この設定は中速域では良好である
が、低速域では慣性効果が小さいために圧縮行程の初期
にシリンダ内から吸気が逆流する特性となる。本発明で
は可変動弁機構を用いているために図示の通り機関回転
数に対応した最適な吸気弁閉時期特性を与えることがで
きている。これにより低速域の圧縮行程初期の吸気逆流
を防止することができ、低速トルクを増強させることが
できる。FIG. 6 shows the closing timing characteristics of the intake valve in a steady state. In the case of a normal fixed valve operating system, the closing timing of the intake valve is 50 BDC (ABDC) regardless of operating conditions.
゜ This is set before and after. This setting is good in the medium speed range, but in the low speed range, the inertia effect is small, so that the intake air flows backward from the cylinder at the beginning of the compression stroke. In the present invention, since the variable valve mechanism is used, an optimal intake valve closing timing characteristic corresponding to the engine speed can be given as shown in the figure. As a result, it is possible to prevent the intake air from flowing backward in the early stage of the compression stroke in the low-speed range, and to increase the low-speed torque.
【００２７】図７は定常時におけるバルブオーバーラッ
プの特性を、図９は過渡運転時におけるバルブオーバー
ラップの特性を示している。過渡運転時には定常時より
もバルブオーバーラップが小さく制御される。これによ
り高い排圧による残留ガスの増加を防止している。FIG. 7 shows the characteristics of the valve overlap in a steady state, and FIG. 9 shows the characteristics of the valve overlap in a transient operation. During the transient operation, the valve overlap is controlled to be smaller than in the steady state. This prevents an increase in residual gas due to a high exhaust pressure.
【００２８】なお、本発明は上記実施形態に限定される
ものではなく、例えば上記実施形態に以下のような変形
を加えてもよい。The present invention is not limited to the above-described embodiment. For example, the following modifications may be made to the above-described embodiment.
【００２９】上記実施形態では吸気弁について開閉時期
を可変制御するようにしたが、図１０に示すように排気
弁について開閉時期を可変制御するようにしてもよい。
また図１１に示すように吸排気弁ともに開閉時期を可変
制御するようにしてもよい。吸排気弁ともに制御するよ
うにすると、吸気弁の作動角設定の自由度を拡大するこ
とができる。またこのときには吸気弁の作動角を定常運
転時と同じ設定にしてもよい。また図１２には吸排気弁
ともに過渡補正を行った例を、図１３には吸気弁にのみ
過渡補正を行った例を示している。In the above embodiment, the opening and closing timing of the intake valve is variably controlled. However, as shown in FIG. 10, the opening and closing timing of the exhaust valve may be variably controlled.
Further, as shown in FIG. 11, the opening and closing timing of both the intake and exhaust valves may be variably controlled. By controlling both the intake and exhaust valves, the degree of freedom in setting the operating angle of the intake valve can be increased. At this time, the operating angle of the intake valve may be set to the same value as in the normal operation. FIG. 12 shows an example in which transient correction is performed for both the intake and exhaust valves, and FIG. 13 shows an example in which transient correction is performed only for the intake valve.
【００３０】すなわち、以上説明した実施の形態は、本
発明の理解を容易にするために記載されたものであっ
て、本発明を限定するために記載されたものではない。
したがって、上記の実施の形態に開示された各要素は、
本発明の技術的範囲に属する全ての設計変更や均等物を
も含む趣旨である。That is, the embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention.
Therefore, each element disclosed in the above embodiment is
It is intended to include all design changes and equivalents belonging to the technical scope of the present invention.
【図１】本発明の動弁制御システムを備えた内燃機関の
構成を示す模式図である。FIG. 1 is a schematic diagram showing a configuration of an internal combustion engine provided with a valve train control system of the present invention.
【図２】吸気弁の作動角を連続可変制御するための動弁
機構を示す斜視図である。FIG. 2 is a perspective view showing a valve operating mechanism for continuously and variably controlling the operating angle of an intake valve.
【図３】カムの作動角の変化によって得られるバルブリ
フト特性を説明する図である。FIG. 3 is a diagram for explaining a valve lift characteristic obtained by changing a working angle of a cam.
【図４】コントロールユニットにおける制御動作のフロ
ーチャートである。FIG. 4 is a flowchart of a control operation in the control unit.
【図５】実施形態における各種運転時のバルブリフト制
御特性を示す図である。FIG. 5 is a diagram showing valve lift control characteristics during various operations in the embodiment.
【図６】定常走行時における吸気弁閉時期の制御特性を
示すグラフである。FIG. 6 is a graph showing control characteristics of intake valve closing timing during steady running.
【図７】定常走行時におけるバルブオーバーラップの制
御特性を示すグラフである。FIG. 7 is a graph showing control characteristics of valve overlap during steady running.
【図８】過渡走行時における吸気弁閉時期の制御特性を
示すグラフである。FIG. 8 is a graph showing control characteristics of intake valve closing timing during transient running.
【図９】過渡走行時におけるバルブオーバーラップの制
御特性を示すグラフである。FIG. 9 is a graph showing control characteristics of valve overlap during transient running.
【図１０】第１の変形例における各種運転時のバルブリ
フト制御特性を示す図である。FIG. 10 is a diagram showing valve lift control characteristics during various operations in a first modified example.
【図１１】第２の変形例における各種運転時のバルブリ
フト制御特性を示す図である。FIG. 11 is a diagram showing valve lift control characteristics during various operations in a second modified example.
【図１２】第３の変形例における各種運転時のバルブリ
フト制御特性を示す図である。FIG. 12 is a diagram showing valve lift control characteristics during various operations in a third modified example.
【図１３】第４の変形例における各種運転時のバルブリ
フト制御特性を示す図である。FIG. 13 is a diagram showing valve lift control characteristics during various operations in a fourth modified example.
【図１４】従来技術の問題点を説明する図である。FIG. 14 is a diagram for explaining a problem of the related art.
１…コンプレッサ ２…吸気弁 ３…過給圧センサ ４…排気弁 ５…排気タービン ６…排圧センサ ７…コントロールユニット ８…アクチュータ ９…排気バイパス弁 １０…駆動軸 １１…吸気弁 １２…カム １３…カムシャフト １４…フランジ部 １４ａ…係合溝 １５…フランジ部 １５ａ…係合溝 １６…環状ディスク １７，１８…ピン １９…偏心カム ２０…コントロールシャフト DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Intake valve 3 ... Supercharging pressure sensor 4 ... Exhaust valve 5 ... Exhaust turbine 6 ... Exhaust pressure sensor 7 ... Control unit 8 ... Actuator 9 ... Exhaust bypass valve 10 ... Drive shaft 11 ... Intake valve 12 ... Cam 13 ... Camshaft 14 ... Flange part 14a ... Engagement groove 15 ... Flange part 15a ... Engagement groove 16 ... Circular disk 17, 18 ... Pin 19 ... Eccentric cam 20 ... Control shaft
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ０２Ｄ 23/00 Ｆ０２Ｄ 23/00 Ｋ 41/02 ３２０ 41/02 ３２０ Continued on the front page (51) Int.Cl. 6 Identification code FI F02D 23/00 F02D 23/00 K 41/02 320 41/02 320
Claims (8)
又は排気弁の開閉時期を変化させる可変動弁制御機構を
備え、機関のアイドリング時には前記吸排気弁のバルブ
オーバーラップを減少させるように制御されるターボ過
給機付き内燃機関において、 加速の過渡運転条件を検出する過渡運転条件検出手段を
備え、 過渡運転条件が検出された時には前記吸排気弁のオーバ
ーラップを定常運転での同一負荷，同一回転数の運転条
件における設定値よりも小さくするように制御すること
を特徴とするターボ過給機付き内燃機関の動弁制御シス
テム。1. An intake valve and / or an air intake valve, comprising:
Or an internal combustion engine with a turbocharger, which is provided with a variable valve control mechanism for changing the opening / closing timing of the exhaust valve, and is controlled so as to reduce the valve overlap of the intake and exhaust valves when the engine is idling. A transient operating condition detecting means for detecting a condition, wherein when the transient operating condition is detected, the overlap of the intake and exhaust valves is set to be smaller than a set value under the operating condition of the same load and the same speed in the steady operation. A valve control system for an internal combustion engine with a turbocharger, wherein the control is performed.
角を小さくして吸気弁の開弁時期を排気行程末期又は吸
入行程初期まで遅らせるとともに吸気弁の閉弁時期を圧
縮下死点側に早めるように制御され、前記過渡運転条件
が検出された時には吸気弁の作動角の拡大を遅らせるよ
うに制御されることを特徴とする請求項１記載のターボ
過給機付き内燃機関の動弁制御システム。2. When the engine is idling, the opening angle of the intake valve is delayed until the end of the exhaust stroke or the beginning of the intake stroke by shortening the operating angle of the intake valve, and the closing timing of the intake valve is advanced to the compression bottom dead center side. 2. A valve control system for an internal combustion engine with a turbocharger according to claim 1, wherein when the transient operation condition is detected, the expansion of the operating angle of the intake valve is controlled to be delayed.
角を小さくして排気弁の閉弁時期を吸入行程初期又は排
気行程末期まで早めるように制御され、前記過渡運転条
件が検出された時には排気弁の作動角の拡大を遅らせる
ように制御されることを特徴とする請求項１記載のター
ボ過給機付き内燃機関の動弁制御システム。3. When the engine is idling, the operating angle of the exhaust valve is reduced so that the closing timing of the exhaust valve is advanced to the beginning of the intake stroke or the end of the exhaust stroke, and when the transient operation condition is detected, the exhaust valve is controlled. 2. The valve operating control system for an internal combustion engine with a turbocharger according to claim 1, wherein the control is performed so as to delay the expansion of the operating angle of the internal combustion engine.
制御する手段は、 機関の回転に同期して回転する駆動軸と、 この駆動軸と同軸上に配設され、かつ吸気弁又は排気弁
を駆動するカムを外周に有するカムシャフトと、 このカムシャフトの端部に設けられ、かつ半径方向に沿
って係合溝が形成された一方のフランジ部と、 この一方のフランジ部に対向するように前記駆動軸側に
設けられ、かつ半径方向に沿って係合溝が形成された他
方のフランジ部と、 上記両フランジ部の間に揺動自在に配設された環状ディ
スクと、 この環状ディスクの両側部に互いに反対方向に突設され
て、上記両フランジ部の各係合溝内に各々係合するピン
と、 前記環状ディスクを機関の運転状態に応じて揺動させる
駆動機構とを備えたことを特徴とする請求項１乃至３い
ずれか記載のターボ過給機付き内燃機関の動弁制御シス
テム。4. A means for continuously and variably controlling the operating angle of the intake valve or the exhaust valve, comprising: a drive shaft that rotates in synchronization with the rotation of the engine; a drive shaft arranged coaxially with the drive shaft; A camshaft having a cam on the outer periphery for driving the exhaust valve; one flange provided at an end of the camshaft and having an engagement groove formed in a radial direction; and facing the one flange The other flange portion provided on the drive shaft side and having an engagement groove formed in the radial direction so as to be rotatable; and an annular disk disposed swingably between the two flange portions. A pin protruding from both sides of the annular disk in opposite directions to engage in respective engagement grooves of the flange portions, and a drive mechanism for swinging the annular disk according to an operating state of the engine. 2. The device according to claim 1, wherein 4. The valve operating control system for an internal combustion engine with a turbocharger according to any one of claims 3 to 3.
流の圧力を検出する過給圧力検出手段と、この過給圧力
検出手段で検出した過給圧を定常運転での同一負荷，同
一回転数の運転条件における過給圧と比較する比較手段
とからなる請求項１乃至４いずれか記載のターボ過給機
付き内燃機関の動弁制御システム。5. The transient operating condition detecting means includes a supercharging pressure detecting means for detecting a pressure upstream of an intake valve, and a supercharging pressure detected by the supercharging pressure detecting means, the same load and the same rotation in a steady operation. The valve control system for an internal combustion engine with a turbocharger according to any one of claims 1 to 4, further comprising comparison means for comparing the boost pressure with a number of operating conditions.
給機の排気タービンの上流の圧力を検出する排気圧力検
出手段と、この排気圧力検出手段で検出した排気圧を定
常運転での同一負荷，同一回転数の運転条件における排
気圧と比較する比較手段とからなる請求項１乃至４いず
れか記載のターボ過給機付き内燃機関の動弁制御システ
ム。6. The transient operating condition detecting means detects an exhaust pressure detected upstream of an exhaust turbine of a turbocharger, and detects an exhaust pressure detected by the exhaust pressure detecting means at the same load in a steady operation. A valve control system for an internal combustion engine with a turbocharger according to any one of claims 1 to 4, further comprising a comparison means for comparing the exhaust pressure with an operating condition at the same rotational speed.
流の圧力を検出する過給圧力検出手段と、ターボ過給機
の排気タービンの上流の圧力を検出する排気圧力検出手
段とを備えてなる請求項１乃至４いずれか記載のターボ
過給機付き内燃機関の動弁制御システム。7. The transient operating condition detecting means includes a supercharging pressure detecting means for detecting a pressure upstream of an intake valve, and an exhaust pressure detecting means for detecting a pressure upstream of an exhaust turbine of a turbocharger. The valve control system for an internal combustion engine with a turbocharger according to any one of claims 1 to 4.
弁の開度を検出する絞り弁開度検出手段を有し、絞り弁
の開度の変化から過渡運転条件を検出することを特徴と
する請求項１乃至４いずれか記載のターボ過給機付き内
燃機関の動弁制御システム。8. The transient operating condition detecting means includes throttle valve opening detecting means for detecting an opening of an intake throttle valve, and detects a transient operating condition from a change in the opening of the throttle valve. A valve control system for an internal combustion engine with a turbocharger according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14715297A JP3932600B2 (en) | 1997-05-21 | 1997-05-21 | Valve control system for internal combustion engine with turbocharger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14715297A JP3932600B2 (en) | 1997-05-21 | 1997-05-21 | Valve control system for internal combustion engine with turbocharger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10318001A true JPH10318001A (en) | 1998-12-02 |
| JP3932600B2 JP3932600B2 (en) | 2007-06-20 |
Family
ID=15423769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14715297A Expired - Fee Related JP3932600B2 (en) | 1997-05-21 | 1997-05-21 | Valve control system for internal combustion engine with turbocharger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3932600B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1162350A2 (en) * | 2000-06-09 | 2001-12-12 | Nissan Motor Co., Ltd. | Variable valve timing device of internal combustion engine |
| US6904881B2 (en) | 2003-09-09 | 2005-06-14 | Toyota Jidosha Kabushiki Kaisha | Apparatus and method for controlling internal combustion engine |
| JP2008215327A (en) * | 2007-03-08 | 2008-09-18 | Hitachi Ltd | Variable valve gear and control device for internal combustion engine |
| EP2208877A1 (en) * | 2007-11-13 | 2010-07-21 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine controller |
| WO2010092678A1 (en) * | 2009-02-13 | 2010-08-19 | トヨタ自動車株式会社 | Internal combustion engine control device |
| US20170167398A1 (en) * | 2015-12-09 | 2017-06-15 | Hyundai Motor Company | System and method for controlling valve timing of continuous variable valve duration engine |
| US10550738B2 (en) | 2017-11-20 | 2020-02-04 | Hyundai Motor Company | Continuously variable valve duration apparatus and engine provided with the same |
| KR20210029092A (en) * | 2019-09-05 | 2021-03-15 | 만 에너지 솔루션즈 에스이 | Valve train and method for actuating gas exchange valves |
-
1997
- 1997-05-21 JP JP14715297A patent/JP3932600B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1162350A2 (en) * | 2000-06-09 | 2001-12-12 | Nissan Motor Co., Ltd. | Variable valve timing device of internal combustion engine |
| EP1162350A3 (en) * | 2000-06-09 | 2002-09-11 | Nissan Motor Co., Ltd. | Variable valve timing device of internal combustion engine |
| US6904881B2 (en) | 2003-09-09 | 2005-06-14 | Toyota Jidosha Kabushiki Kaisha | Apparatus and method for controlling internal combustion engine |
| DE102004043265B4 (en) * | 2003-09-09 | 2008-02-21 | Toyota Jidosha Kabushiki Kaisha, Toyota | Device and method for controlling an internal combustion engine |
| JP2008215327A (en) * | 2007-03-08 | 2008-09-18 | Hitachi Ltd | Variable valve gear and control device for internal combustion engine |
| EP2208877A4 (en) * | 2007-11-13 | 2012-11-21 | Toyota Motor Co Ltd | Internal combustion engine controller |
| EP2208877A1 (en) * | 2007-11-13 | 2010-07-21 | Toyota Jidosha Kabushiki Kaisha | Internal combustion engine controller |
| WO2010092678A1 (en) * | 2009-02-13 | 2010-08-19 | トヨタ自動車株式会社 | Internal combustion engine control device |
| JP4816812B2 (en) * | 2009-02-13 | 2011-11-16 | トヨタ自動車株式会社 | Control device for internal combustion engine |
| US8086385B2 (en) | 2009-02-13 | 2011-12-27 | Toyota Jidosha Kabushiki Kaisha | Control apparatus for internal combustion engine |
| US20170167398A1 (en) * | 2015-12-09 | 2017-06-15 | Hyundai Motor Company | System and method for controlling valve timing of continuous variable valve duration engine |
| US10202918B2 (en) * | 2015-12-09 | 2019-02-12 | Hyundai Motor Company | System and method for controlling valve timing of continuous variable valve duration engine |
| US10550738B2 (en) | 2017-11-20 | 2020-02-04 | Hyundai Motor Company | Continuously variable valve duration apparatus and engine provided with the same |
| KR20210029092A (en) * | 2019-09-05 | 2021-03-15 | 만 에너지 솔루션즈 에스이 | Valve train and method for actuating gas exchange valves |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3932600B2 (en) | 2007-06-20 |
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