JP7288395B2 - Twin scroll turbo communication passage mechanism - Google Patents

Twin scroll turbo communication passage mechanism Download PDF

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JP7288395B2
JP7288395B2 JP2019220141A JP2019220141A JP7288395B2 JP 7288395 B2 JP7288395 B2 JP 7288395B2 JP 2019220141 A JP2019220141 A JP 2019220141A JP 2019220141 A JP2019220141 A JP 2019220141A JP 7288395 B2 JP7288395 B2 JP 7288395B2
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JP2021088966A (en
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雅俊 柳沢
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Hino Motors Ltd
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    • 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
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Description

本発明は、ツインスクロールターボの連通路機構に関する。 The present invention relates to a communication passage mechanism for a twin scroll turbo.

エキゾーストマニホールドからターボチャージャのタービンハウジングへの流路が第１流路と第２流路とに分割されたツインスクロールターボが知られている。ツインスクロールターボでは、第１流路と第２流路との間に開閉自在な連通路を設け、回転数又は負荷に応じて連通路を開閉することによりポンピングロスが低減し、燃費が改善する。例えば、特許文献１には、連通路を板状部材により部分的に覆うことによって、連通路の開度を調整する技術が開示されている。 A twin scroll turbo is known in which the flow path from the exhaust manifold to the turbine housing of the turbocharger is divided into a first flow path and a second flow path. In the twin scroll turbocharger, an openable and closable communication passage is provided between the first and second passages, and pumping loss is reduced by opening and closing the communication passage according to the rotation speed or load, thereby improving fuel efficiency. . For example, Patent Literature 1 discloses a technique of adjusting the degree of opening of a communication path by partially covering the communication path with a plate member.

特表２０１７-５３７２５９号公報Japanese Patent Publication No. 2017-537259

ところで、上記特許文献１のような技術では、微小開度で連通路の開度を適切に制御するためには、高分解能のアクチュエータを必要とし、高コストをもたらすため、改善が望まれている。 By the way, the technique disclosed in Patent Document 1 requires a high-resolution actuator in order to appropriately control the opening of the communication path with a minute opening, which results in high cost. Therefore, improvement is desired. .

そこで本発明は、高分解能のアクチュエータを要さずに、単純な構成により、連通路の開度を適切に制御することができるツインスクロールターボの連通路機構を提供することを目的とする。 SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a communication passage mechanism for a twin scroll turbo that can appropriately control the degree of opening of the communication passage with a simple configuration without requiring a high-resolution actuator.

本発明は、エキゾーストマニホールドからターボチャージャのタービンハウジングへの流路が第１流路と第２流路とに分割され、第１流路と第２流路との間に開閉自在な連通路が設けられたツインスクロールターボの連通路機構であって、第１流路と第２流路との間の大連通路と、大連通路を開閉する大連通バルブと、大連通バルブの内部に設けられ、大連通路よりも断面積が小さい小連通路と、大連通バルブの内部に設けられ、小連通路を開閉する小連通バルブとを備え、小連通バルブが小連通路を閉鎖し、大連通バルブが大連通路を閉鎖することにより、第１流路と第２流路との間の連通路が閉鎖された閉鎖状態と、小連通バルブが小連通路を開放し、大連通バルブが大連通路を閉鎖することにより、第１流路と第２流路との間の連通路の最小断面積が小連通路の断面積である小開放状態と、小連通バルブが小連通路を開放し、大連通バルブが大連通路を開放することにより、第１流路と第２流路との間の連通路の最小断面積が大連通路の断面積である大開放状態とに変更自在なツインスクロールターボの連通路機構である。 According to the present invention, a flow path from an exhaust manifold to a turbine housing of a turbocharger is divided into a first flow path and a second flow path, and an openable and closable communication path is provided between the first flow path and the second flow path. A communication passage mechanism for a twin scroll turbo provided, comprising: a large communication passage between a first flow passage and a second flow passage; a large communication valve for opening and closing the large communication passage; A small communication passage having a smaller cross-sectional area than the large connection passage, and a small communication valve provided inside the large communication valve for opening and closing the small communication passage, the small communication valve closing the small communication passage, and the large communication valve closing the small communication passage. By closing the large communication passage, a closed state in which the communication passage between the first flow passage and the second flow passage is closed, and a small communication valve opens the small communication passage and the large communication valve closes the large communication passage. By doing so, a small open state in which the minimum cross-sectional area of the communication path between the first flow path and the second flow path is the cross-sectional area of the small communication path, and a small communication valve opens the small communication path to create a large communication state. By opening the large communication passage with the valve, the connection of the twin scroll turbo can be freely changed to a large open state in which the minimum cross-sectional area of the communication passage between the first flow passage and the second flow passage is the cross-sectional area of the large communication passage. passage mechanism.

この構成によれば、エキゾーストマニホールドからターボチャージャのタービンハウジングへの流路が第１流路と第２流路とに分割され、第１流路と第２流路との間に開閉自在な連通路が設けられたツインスクロールターボの連通路機構において、第１流路と第２流路との間の大連通路と、大連通路を開閉する大連通バルブと、大連通バルブの内部に設けられ、大連通路よりも断面積が小さい小連通路と、大連通バルブの内部に設けられ、小連通路を開閉する小連通バルブとを備え、小連通バルブが小連通路を閉鎖し、大連通バルブが大連通路を閉鎖することにより、第１流路と第２流路との間の連通路が閉鎖された閉鎖状態と、小連通バルブが小連通路を開放し、大連通バルブが大連通路を閉鎖することにより、第１流路と第２流路との間の連通路の最小断面積が小連通路の断面積である小開放状態と、小連通バルブが小連通路を開放し、大連通バルブが大連通路を開放することにより、第１流路と第２流路との間の連通路の最小断面積が大連通路の断面積である大開放状態とに変更自在である。そのため、高分解能のアクチュエータを要さずに、単純な構成により、連通路の開度を適切に制御することができる。 According to this configuration, the flow path from the exhaust manifold to the turbine housing of the turbocharger is divided into the first flow path and the second flow path, and the first flow path and the second flow path are freely openable and closable. In a communication passage mechanism of a twin scroll turbo provided with passages, provided inside the large communication passage between the first flow passage and the second flow passage, the large communication valve that opens and closes the large communication passage, and the large communication valve, A small communication passage having a smaller cross-sectional area than the large connection passage, and a small communication valve provided inside the large communication valve for opening and closing the small communication passage, the small communication valve closing the small communication passage, and the large communication valve closing the small communication passage. By closing the large communication passage, a closed state in which the communication passage between the first flow passage and the second flow passage is closed, and a small communication valve opens the small communication passage and the large communication valve closes the large communication passage. By doing so, a small open state in which the minimum cross-sectional area of the communication path between the first flow path and the second flow path is the cross-sectional area of the small communication path, and a small communication valve opens the small communication path to create a large communication state. By opening the large communication passage with the valve, the minimum cross-sectional area of the communication passage between the first flow passage and the second flow passage can be changed to a large open state in which the cross-sectional area of the large communication passage is the minimum cross-sectional area. Therefore, it is possible to appropriately control the opening of the communication path with a simple configuration without requiring a high-resolution actuator.

この場合、大開放状態のときに、大連通路は、タービンハウジングを迂回しつつタービンハウジングの下流の流路に連通するバイパス路に連通していてもよい。 In this case, in the wide open state, the large communication passage may communicate with a bypass passage that bypasses the turbine housing and communicates with the flow path downstream of the turbine housing.

この構成によれば、大開放状態のときに、大連通路は、タービンハウジングを迂回しつつタービンハウジングの下流の流路に連通するバイパス路に連通しており、大連通路の大きな断面積が律速となるため、大流量に対応でき、ウェストゲート量不足とならず、適切なウェストゲート量に制御することができる。 According to this configuration, in the large open state, the large connecting passage communicates with the bypass passage that bypasses the turbine housing and communicates with the flow path downstream of the turbine housing, and the large cross-sectional area of the large connecting passage is rate-limiting. Therefore, it is possible to handle a large amount of flow, prevent a shortage of the wastegate amount, and control the amount of the wastegate to an appropriate amount.

また、大連通バルブが大連通路を閉鎖する方向に付勢するバネと、小連通バルブ及び大連通バルブを作動させるアクチュエータとをさらに備え、小開放状態では、アクチュエータによって、バネにより付勢されることにより大連通路を閉鎖している大連通バルブの内部の小連通バルブが作動させられることにより小連通路が開放され、大開放状態では、小連通バルブを作動させて小連通路を開放させているアクチュエータによって、バネにより大連通路を閉鎖する方向に付勢されている大連通バルブが作動させられることにより大連通路が開放されてもよい。 In addition, a spring that biases the large communication valve in a direction to close the large communication passage, and an actuator that operates the small communication valve and the large communication valve are further provided. By actuating a small communication valve inside the large communication valve that closes the large communication passage, the small communication passage is opened, and in the large open state, the small communication valve is operated to open the small communication passage. The large communication passage may be opened by the actuator operating a large communication valve biased by a spring in a direction to close the large communication passage.

この構成によれば、大連通バルブが大連通路を閉鎖する方向に付勢するバネと、小連通バルブ及び大連通バルブを作動させるアクチュエータとをさらに備え、小開放状態では、アクチュエータによって、バネにより付勢されることにより大連通路を閉鎖している大連通バルブの内部の小連通バルブが作動させられることにより小連通路が開放され、大開放状態では、小連通バルブを作動させて小連通路を開放させているアクチュエータによって、バネにより大連通路を閉鎖する方向に付勢されている大連通バルブが作動させられることにより大連通路が開放されるため、バネと１つのアクチュエータとによる単純な構成により、連通路の開度を適切に制御することができる。 According to this configuration, the large communication valve further includes a spring that biases the large communication passage in a direction to close the large communication passage, and an actuator that operates the small communication valve and the large communication valve. When the force is applied, a small communication valve inside the large communication valve that closes the large communication passage is operated to open the small communication passage, and in the large open state, the small communication valve is operated to close the small communication passage. A large communication valve biased by a spring in a direction to close the large communication passage is operated by the actuator that opens the large communication passage, thereby opening the large communication passage. The degree of opening of the communication path can be appropriately controlled.

本発明のツインスクロールターボの連通路機構によれば、高分解能のアクチュエータを要さずに、単純な構成により、連通路の開度を適切に制御することができる。 According to the communication passage mechanism of the twin scroll turbo of the present invention, it is possible to appropriately control the opening degree of the communication passage with a simple configuration without requiring a high-resolution actuator.

実施形態に係るツインスクロールターボを示す図である。It is a figure which shows the twin scroll turbo which concerns on embodiment. 実施形態に係るツインスクロールターボの連通路機構の閉鎖状態を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a closed state of the communication passage mechanism of the twin scroll turbo according to the embodiment; 実施形態に係るツインスクロールターボの連通路機構の小開放状態を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing a slightly opened state of the communication passage mechanism of the twin-scroll turbo according to the embodiment; 実施形態に係るツインスクロールターボの連通路機構の大開放状態を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing a large open state of the communication passage mechanism of the twin-scroll turbo according to the embodiment;

以下、本発明の実施形態に係るツインスクロールターボの連通路機構について、図面を用いて詳細に説明する。図１に示されるように、本実施形態の連通路機構１は、ツインスクロールターボ１００に適用される。ツインスクロールターボ１００では、エンジン１０のエキゾーストマニホールド１５からタービンハウジング１９及びコンプレッサ２０を有するターボチャージャ１８のタービンハウジング１９への流路が、第１気筒１１及び第４気筒１４の排気を束ねた第１流路１６と、第２気筒１２及び第３気筒１３の排気を束ねた第２流路１７とに分割されている。第１流路１６と第２流路１７との間には開閉自在な連通路２が設けられている。連通路２は、ウェストゲートバルブ２２を介して、タービンハウジング１９を迂回しつつタービンハウジング１９の下流の流路に連通するバイパス路２１に連通している。 A communication passage mechanism for a twin scroll turbocharger according to an embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, the communication passage mechanism 1 of this embodiment is applied to a twin scroll turbo 100. As shown in FIG. In the twin scroll turbocharger 100, the flow path from the exhaust manifold 15 of the engine 10 to the turbine housing 19 of the turbocharger 18 having the turbine housing 19 and the compressor 20 is the first cylinder 11 and the exhaust gas of the fourth cylinder 14 bundled together. It is divided into a flow path 16 and a second flow path 17 that bundles exhaust gases from the second cylinder 12 and the third cylinder 13 . A freely openable/closable communication path 2 is provided between the first flow path 16 and the second flow path 17 . The communication passage 2 communicates with a bypass passage 21 that bypasses the turbine housing 19 and communicates with a flow path downstream of the turbine housing 19 via a waste gate valve 22 .

図２に示されるように、連通路機構１は、第１流路１６と第２流路１７とが隣接している箇所に配置されている。連通路機構１は、第１流路１６と第２流路１７との間の大連通路３と、大連通路３を開閉する大連通バルブ５とを備える。図２に示される第１流路１６と第２流路１７との間の連通路２が閉鎖された閉鎖状態では、大連通路３は、大連通バルブ５により閉鎖されている。連通路機構１は、大連通バルブ５の内部に設けられ、大連通路３よりも断面積が小さい小連通路４と、大連通バルブ５の内部に設けられ、小連通路４を開閉する小連通バルブ６とを備える。図２に示される第１流路１６と第２流路１７との間の連通路２が閉鎖された閉鎖状態では、小連通路４は、小連通バルブ６により閉鎖されている。 As shown in FIG. 2, the communication path mechanism 1 is arranged at a location where the first flow path 16 and the second flow path 17 are adjacent to each other. The communication passage mechanism 1 includes a large communication passage 3 between the first flow passage 16 and the second flow passage 17 and a large communication valve 5 that opens and closes the large communication passage 3 . In the closed state shown in FIG. 2 in which the communication passage 2 between the first flow passage 16 and the second flow passage 17 is closed, the large communication passage 3 is closed by the large communication valve 5 . The communication passage mechanism 1 includes a small communication passage 4 provided inside the large communication valve 5 and having a smaller cross-sectional area than the large communication passage 3, and a small communication passage provided inside the large communication valve 5 for opening and closing the small communication passage 4. a valve 6; In the closed state shown in FIG. 2 in which the communication passage 2 between the first flow passage 16 and the second flow passage 17 is closed, the small communication passage 4 is closed by the small communication valve 6 .

連通路機構１は、大連通バルブ５が大連通路３を閉鎖する方向に付勢するバネ７と、小連通バルブ６及び大連通バルブ５を作動させるアクチュエータ８と備える。アクチュエータ８は、その駆動軸８ａが大連通バルブ５の内部の小連通バルブを電磁石又は油圧等の力によって押し込むことにより、小連通バルブ６が小連通路４を閉鎖する方向に力を加える。また、アクチュエータ８は、その駆動軸８ａが大連通バルブ５の内部の小連通バルブ６を電磁石又は油圧等の力によって引っ張ることにより、小連通バルブ６が小連通路４を開放し、大連通バルブ５の内部の小連通バルブ６を介して大連通バルブ５が大連通路３を開放する方向に力を加える。バネ７は、アクチュエータ８の駆動軸８ａの周囲に配置された圧縮バネであり、大連通バルブ５が大連通路３を閉鎖する方向に付勢する。大連通バルブ５の周囲は、バイパス路２１に連通している。 The communication passage mechanism 1 includes a spring 7 that biases the large communication valve 5 in a direction to close the large communication passage 3 , and an actuator 8 that operates the small communication valve 6 and the large communication valve 5 . The drive shaft 8a of the actuator 8 pushes the small communication valve inside the large communication valve 5 by electromagnet or hydraulic force, so that the small communication valve 6 applies force in the direction of closing the small communication passage 4. As shown in FIG. In addition, the drive shaft 8a of the actuator 8 pulls the small communication valve 6 inside the large communication valve 5 by a force such as an electromagnet or hydraulic pressure, so that the small communication valve 6 opens the small communication passage 4, and the large communication valve The large communication valve 5 applies force in the direction of opening the large communication passage 3 via the small communication valve 6 inside 5 . The spring 7 is a compression spring arranged around the drive shaft 8a of the actuator 8, and biases the large communication valve 5 in the direction of closing the large communication passage 3. As shown in FIG. The periphery of the large communication valve 5 communicates with the bypass passage 21 .

以下、本実施形態のツインスクロールターボ１００の連通路機構１の動作について説明する。図２に示される閉鎖状態では、アクチュエータ８の駆動軸８ａにより押し込まれた小連通バルブ６が小連通路４を閉鎖し、バネ７により付勢されている大連通バルブ５が大連通路３を閉鎖することにより、第１流路１６と第２流路１７との間の連通路２が閉鎖される。 The operation of the communication passage mechanism 1 of the twin scroll turbocharger 100 of this embodiment will be described below. In the closed state shown in FIG. 2, the small communication valve 6 pushed by the drive shaft 8a of the actuator 8 closes the small communication passage 4, and the large communication valve 5 biased by the spring 7 closes the large communication passage 3. By doing so, the communication path 2 between the first flow path 16 and the second flow path 17 is closed.

図３に示される小開放状態では、アクチュエータ８の駆動軸８ａによって、バネ７により付勢されることにより大連通路３を閉鎖している大連通バルブ５の内部の小連通バルブ６が引っ張られることによって作動させられることにより小連通路４が開放される。小開放状態では、小連通バルブ６が小連通路４を開放し、バネ７により付勢されている大連通バルブ５が大連通路３を閉鎖することにより、第１流路１６と第２流路１７との間の連通路２の最小断面積が小連通路４の断面積となる。つまり、小開放状態では、断面積が小さい小連通路４が律速となる。 In the small open state shown in FIG. 3, the drive shaft 8a of the actuator 8 pulls the small communication valve 6 inside the large communication valve 5 closing the large communication passage 3 by being biased by the spring 7. , the small communication passage 4 is opened. In the small open state, the small communication valve 6 opens the small communication passage 4, and the large communication valve 5 biased by the spring 7 closes the large communication passage 3, whereby the first flow path 16 and the second flow path are opened. 17 is the minimum cross-sectional area of the small communicating path 4 . In other words, in the small open state, the small communication passage 4 with a small cross-sectional area is rate-determining.

図４に示される大開放状態では、小連通バルブ６を作動させて小連通路４を開放させているアクチュエータ８の駆動軸８ａによって、大連通バルブ５の内部の小連通バルブ６を介して、バネ７により大連通路３を閉鎖する方向に付勢されている大連通バルブ５が引っ張られることによって作動させられることにより大連通路３が開放される。大開放状態では、小連通バルブ６が小連通路４を開放し、大連通バルブ５が大連通路３を開放することにより、第１流路１６と第２流路１７との間の連通路２の最小断面積が大連通路３の断面積となる。つまり、大開放状態では、断面積が大きい大連通路３が律速となる。大開放状態のときに、大連通路３は、タービンハウジング１９を迂回しつつタービンハウジング１９の下流の流路に連通するバイパス路２１に連通している。 In the large open state shown in FIG. 4, the drive shaft 8a of the actuator 8, which operates the small communication valve 6 to open the small communication passage 4, causes the small communication valve 6 inside the large communication valve 5 to The large communication passage 3 is opened by pulling the large communication valve 5 biased by the spring 7 in the direction to close the large communication passage 3 . In the large open state, the small communication valve 6 opens the small communication passage 4 and the large communication valve 5 opens the large communication passage 3, thereby opening the communication passage 2 between the first flow passage 16 and the second flow passage 17. becomes the cross-sectional area of the large communication passage 3. That is, in the large open state, the large connecting passage 3 having a large cross-sectional area becomes rate limiting. In the large open state, the large connecting passage 3 communicates with a bypass passage 21 that bypasses the turbine housing 19 and communicates with a flow path downstream of the turbine housing 19 .

以上のように、本実施形態のツインスクロールターボ１００の連通路機構１では、閉鎖状態と、小開放状態と、大開放状態とに変更自在である。 As described above, in the communication passage mechanism 1 of the twin scroll turbocharger 100 of the present embodiment, the closed state, the small open state, and the large open state can be changed freely.

ツインスクロールターボ１００では、第１流路１６と第２流路１７との間に開閉自在な連通路２を設け、回転数又は負荷に応じて連通路２を開閉することによりポンピングロスが低減し、燃費が改善することが判っている。しかし、本発明者による実験により、連通路２を開閉するバルブは、微小開度の特性が過敏であることが判った。微小開度で連通路２を開閉するバルブを精密な開度に調整するためには、高分解能のアクチュエータが必要となり、高コストをもたらす。一方、微小開度での特性を緩慢にするために、連通路２の断面積を絞った場合には、フルリフト時の全流量も低下するため、連通路２を開閉するバルブを全開にしたとしても、連通路２の連通量及びウェストゲート量が不足となる懸念がある。 In the twin scroll turbocharger 100, a communication passage 2 that can be freely opened and closed is provided between the first passage 16 and the second passage 17, and pumping loss is reduced by opening and closing the communication passage 2 according to the rotation speed or load. has been found to improve fuel efficiency. However, experiments by the present inventors have revealed that the valve for opening and closing the communication passage 2 is sensitive to minute opening characteristics. In order to precisely adjust the opening of the valve that opens and closes the communication passage 2 with a minute opening, a high-resolution actuator is required, resulting in high cost. On the other hand, if the cross-sectional area of the communicating path 2 is reduced in order to slow down the characteristics at a minute opening, the total flow rate at full lift will also decrease. Also, there is a concern that the amount of communication in the communication path 2 and the amount of the waste gate will be insufficient.

一方、本実施形態では、エキゾーストマニホールド１５からターボチャージャ１８のタービンハウジング１９への流路が第１流路１６と第２流路１７とに分割され、第１流路１６と第２流路１７との間に開閉自在な連通路２が設けられたツインスクロールターボ１００の連通路機構１において、第１流路１６と第２流路１７との間の大連通路３と、大連通路３を開閉する大連通バルブ５と、大連通バルブ５の内部に設けられ、大連通路３よりも断面積が小さい小連通路４と、大連通バルブ５の内部に設けられ、小連通路４を開閉する小連通バルブ６とを備え、小連通バルブ６が小連通路４を閉鎖し、大連通バルブ５が大連通路３を閉鎖することにより、第１流路１６と第２流路１７との間の連通路２が閉鎖された閉鎖状態と、小連通バルブ６が小連通路４を開放し、大連通バルブ５が大連通路３を閉鎖することにより、第１流路１６と第２流路１７との間の連通路２の最小断面積が小連通路４の断面積である小開放状態と、小連通バルブ６が小連通路４を開放し、大連通バルブ５が大連通路３を開放することにより、第１流路１６と第２流路１７との間の連通路２の最小断面積が大連通路３の断面積である大開放状態とに変更自在である。そのため、高分解能のアクチュエータを要さずに、単純な構成により、連通路２の開度を適切に制御することができる。 On the other hand, in this embodiment, the flow path from the exhaust manifold 15 to the turbine housing 19 of the turbocharger 18 is divided into the first flow path 16 and the second flow path 17. In the communication passage mechanism 1 of the twin scroll turbo 100 in which the openable and closable communication passage 2 is provided between and a small communication passage 4 provided inside the large communication valve 5 and having a smaller cross-sectional area than the large communication passage 3; The small communication valve 6 closes the small communication passage 4 and the large communication valve 5 closes the large communication passage 3, thereby connecting the first flow path 16 and the second flow path 17. The closed state in which the passage 2 is closed, the small communication valve 6 opening the small communication passage 4, and the large communication valve 5 closing the large communication passage 3 cause the first passage 16 and the second passage 17 to be separated. A small open state in which the minimum cross-sectional area of the communication passage 2 between , and a large open state in which the minimum cross-sectional area of the communication path 2 between the first flow path 16 and the second flow path 17 is the cross-sectional area of the large communication path 3 . Therefore, the opening degree of the communication path 2 can be appropriately controlled with a simple configuration without requiring a high-resolution actuator.

つまり、小開放状態では、断面積が小さい小連通路４が律速となる。このため、微小開度の特性を緩慢にすることができる。一方、大開放状態では、断面積が大きい大連通路３が律速となる。このため、大流量に対応することができる。このように本実施形態では、定常運転時及び過渡運転時の急激な流量変化が抑えられることから、制御性向上が果たされる。 In other words, in the small open state, the small communication passage 4 with a small cross-sectional area is rate-determining. For this reason, the characteristics of the minute opening can be slowed down. On the other hand, in the large open state, the large connecting passage 3 having a large cross-sectional area becomes rate-determining. Therefore, it is possible to cope with a large flow rate. As described above, in the present embodiment, abrupt changes in the flow rate are suppressed during steady-state operation and during transient operation, thereby improving controllability.

また、本実施形態では、大開放状態のときに、大連通路３は、タービンハウジング１９を迂回しつつタービンハウジング１９の下流の流路に連通するバイパス路２１に連通しており、大連通路３の大きな断面積が律速となるため、大流量に対応でき、ウェストゲート量不足とならず、適切なウェストゲート量に制御することができる。 In addition, in the present embodiment, in the large open state, the large connecting passage 3 communicates with the bypass passage 21 that bypasses the turbine housing 19 and communicates with the flow path downstream of the turbine housing 19. Since the large cross-sectional area is rate-determining, it is possible to handle a large flow rate, prevent the wastegate from becoming insufficient, and control the wastegate to an appropriate amount.

また、本実施形態では、大連通バルブ５が大連通路３を閉鎖する方向に付勢するバネ７と、小連通バルブ６及び大連通バルブ５を作動させるアクチュエータ８とをさらに備え、小開放状態では、アクチュエータ８によって、バネ７により付勢されることにより大連通路３を閉鎖している大連通バルブ５の内部の小連通バルブ６が作動させられることにより小連通路４が開放され、大開放状態では、小連通バルブ６を作動させて小連通路４を開放させているアクチュエータ８によって、バネ７により大連通路３を閉鎖する方向に付勢されている大連通バルブ５が作動させられることにより大連通路３が開放されるため、バネ７と１つのアクチュエータ８とによる単純な構成により、連通路２の開度を適切に制御することができる。 Further, in this embodiment, the large communication valve 5 is further provided with a spring 7 that biases the large communication passage 3 in the closing direction, and an actuator 8 that operates the small communication valve 6 and the large communication valve 5. The small communication valve 6 inside the large communication valve 5 which closes the large communication passage 3 is operated by the actuator 8 by being biased by the spring 7, thereby opening the small communication passage 4, and the large open state is achieved. Then, the large communication valve 5 urged by the spring 7 in the direction of closing the large communication passage 3 is operated by the actuator 8 that operates the small communication valve 6 to open the small communication passage 4, and the large communication valve 5 is actuated. Since the passage 3 is opened, the opening degree of the communication passage 2 can be appropriately controlled with a simple configuration using the spring 7 and one actuator 8 .

以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく様々な形態で実施される。例えば、上記実施形態の連通路機構１において、小連通バルブ６の内部に設けられ、小連通路４よりも断面積が小さい極小連通路と、小連通バルブ６の内部に設けられ、極小連通路を開閉する極小連通バルブとをさらに備えてもよい。この場合、連通路機構１は、上述した閉鎖状態と、小開放状態と、大開放状態とに加えて、極小連通バルブが極小連通路を開放し、小連通バルブ６が小連通路４を閉鎖し、大連通バルブ５が大連通路３を閉鎖することにより、第１流路１６と第２流路１７との間の連通路２の最小断面積が極小連通路の断面積である極小開放状態との４つの状態に変更自在でもよい。同様に、連通路機構１は５以上の状態に変更自在でもよい。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be implemented in various forms. For example, in the communication path mechanism 1 of the above-described embodiment, a minimal communication path provided inside the small communication valve 6 and having a cross-sectional area smaller than that of the small communication path 4, and a minimal communication path provided inside the small communication valve 6, It may further include a minimal communication valve that opens and closes the . In this case, in addition to the closed state, the small open state, and the large open state, the communication path mechanism 1 has the minimum communication valve opening the minimum communication path and the small communication valve 6 closing the small communication path 4. Then, when the large communication valve 5 closes the large communication passage 3, the minimum cross-sectional area of the communication passage 2 between the first flow passage 16 and the second flow passage 17 is the minimum cross-sectional area of the minimum communication passage. It may be freely changeable to four states. Similarly, the communication path mechanism 1 may be freely changeable to five or more states.

また、上記実施形態の連通路機構１において、大連通バルブ５の内部に小連通バルブ６が小連通路４を閉鎖する方向に付勢する小連通バルブ用バネをさらに備え、閉鎖状態では、小連通バルブ用バネにより付勢されている小連通バルブ６が小連通路４を閉鎖し、バネ７により付勢されている大連通バルブ５が大連通路３を閉鎖することにより、第１流路１６と第２流路１７との間の連通路２が閉鎖されてもよい。これにより、アクチュエータ８は、駆動軸８ａを引っ張る方向に力を与える機能のみを有すればよくなる。 In the communication passage mechanism 1 of the above-described embodiment, a small communication valve spring is further provided inside the large communication valve 5 to bias the small communication valve 6 in a direction to close the small communication passage 4. The small communication valve 6 biased by the communication valve spring closes the small communication passage 4, and the large communication valve 5 biased by the spring 7 closes the large communication passage 3, thereby opening the first flow path 16. and the second channel 17 may be closed. As a result, the actuator 8 only needs to have the function of applying force in the direction of pulling the drive shaft 8a.

１…連通路機構、２…連通路、３…大連通路、４…小連通路、５…大連通バルブ、６…小連通バルブ、７…バネ、８…アクチュエータ、８ａ…駆動軸、１０…エンジン、１１…第１気筒、１２…第２気筒、１３…第３気筒、１４…第４気筒、１５…エキゾーストマニホールド、１６…第１流路、１７…第２流路、１８…ターボチャージャ、１９…タービンハウジング、２０…コンプレッサ、２１…バイパス路、２２…ウェストゲートバルブ、１００…ツインスクロールターボ。 DESCRIPTION OF SYMBOLS 1... Communication path mechanism, 2... Communication path, 3... Large connection path, 4... Small communication path, 5... Large communication valve, 6... Small communication valve, 7... Spring, 8... Actuator, 8a... Drive shaft, 10... Engine , 11... First cylinder, 12... Second cylinder, 13... Third cylinder, 14... Fourth cylinder, 15... Exhaust manifold, 16... First flow path, 17... Second flow path, 18... Turbocharger, 19 ... turbine housing, 20 ... compressor, 21 ... bypass passage, 22 ... waste gate valve, 100 ... twin scroll turbo.

Claims (3)

エキゾーストマニホールドからターボチャージャのタービンハウジングへの流路が第１流路と第２流路とに分割され、前記第１流路と前記第２流路との間に開閉自在な連通路が設けられたツインスクロールターボの連通路機構であって、
前記第１流路と前記第２流路との間の大連通路と、
前記大連通路を開閉する大連通バルブと、
前記大連通バルブの内部に設けられ、前記大連通路よりも断面積が小さい小連通路と、
前記大連通バルブの内部に設けられ、前記小連通路を開閉する小連通バルブと、
を備え、
前記小連通バルブが前記小連通路を閉鎖し、前記大連通バルブが前記大連通路を閉鎖することにより、前記第１流路と前記第２流路との間の前記連通路が閉鎖された閉鎖状態と、
前記小連通バルブが前記小連通路を開放し、前記大連通バルブが前記大連通路を閉鎖することにより、前記第１流路と前記第２流路との間の前記連通路の最小断面積が前記小連通路の断面積である小開放状態と、
前記小連通バルブが前記小連通路を開放し、前記大連通バルブが前記大連通路を開放することにより、前記第１流路と前記第２流路との間の前記連通路の最小断面積が前記大連通路の断面積である大開放状態と、に変更自在なツインスクロールターボの連通路機構。 A flow path from the exhaust manifold to the turbine housing of the turbocharger is divided into a first flow path and a second flow path, and an openable and closable communication path is provided between the first flow path and the second flow path. A communication passage mechanism for a twin scroll turbo,
a large communication passage between the first flow channel and the second flow channel;
a Dalian communication valve that opens and closes the Dalian passage;
a small communication passage provided inside the large communication valve and having a smaller cross-sectional area than the large communication passage;
a small communication valve provided inside the large communication valve for opening and closing the small communication passage;
with
The small communication valve closes the small communication passage, and the large communication valve closes the large communication passage, thereby closing the communication passage between the first flow passage and the second flow passage. state and
The small communication valve opens the small communication passage and the large communication valve closes the large communication passage, so that the minimum cross-sectional area of the communication passage between the first flow passage and the second flow passage is a small open state, which is the cross-sectional area of the small communication path;
The small communication valve opens the small communication passage, and the large communication valve opens the large communication passage, so that the minimum cross-sectional area of the communication passage between the first flow passage and the second flow passage is A communication passage mechanism of a twin scroll turbo that can be freely changed between a large open state, which is the cross-sectional area of the large communication passage. 前記大開放状態のときに、前記大連通路は、前記タービンハウジングを迂回しつつ前記タービンハウジングの下流の流路に連通するバイパス路に連通している、請求項１に記載のツインスクロールターボの連通路機構。 2. The communication of the twin scroll turbo according to claim 1, wherein, in said large open state, said large communication passage bypasses said turbine housing and communicates with a bypass passage communicating with a flow path downstream of said turbine housing. passage mechanism. 前記大連通バルブが前記大連通路を閉鎖する方向に付勢するバネと、
前記小連通バルブ及び前記大連通バルブを作動させるアクチュエータと、
をさらに備え、
前記小開放状態では、前記アクチュエータによって、前記バネにより付勢されることにより前記大連通路を閉鎖している前記大連通バルブの内部の前記小連通バルブが作動させられることにより前記小連通路が開放され、
前記大開放状態では、前記小連通バルブを作動させて前記小連通路を開放させているアクチュエータによって、前記バネにより前記大連通路を閉鎖する方向に付勢されている前記大連通バルブが作動させられることにより前記大連通路が開放される、請求項１又は２に記載のツインスクロールターボの連通路機構。 a spring biasing the large communication valve in a direction to close the large communication passage;
an actuator that operates the small communication valve and the large communication valve;
further comprising
In the small open state, the actuator actuates the small communication valve inside the large communication valve that closes the large communication passage by being biased by the spring, thereby opening the small communication passage. is,
In the large open state, the large communication valve biased by the spring in the direction of closing the large communication passage is operated by the actuator that operates the small communication valve to open the small communication passage. 3. A communication passage mechanism for a twin-scroll turbo according to claim 1, wherein said large communication passage is thereby opened.
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