WO2012029603A1 - Start-up assist device - Google Patents

Start-up assist device Download PDF

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Publication number
WO2012029603A1
WO2012029603A1 PCT/JP2011/069031 JP2011069031W WO2012029603A1 WO 2012029603 A1 WO2012029603 A1 WO 2012029603A1 JP 2011069031 W JP2011069031 W JP 2011069031W WO 2012029603 A1 WO2012029603 A1 WO 2012029603A1
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Prior art keywords
supercharger
engine
compressor
intake
turbocharger
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PCT/JP2011/069031
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French (fr)
Japanese (ja)
Inventor
飯島　章
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いすゞ自動車株式会社
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Publication of WO2012029603A1 publication Critical patent/WO2012029603A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/32—Engines with pumps other than of reciprocating-piston type
    • F02B33/34—Engines with pumps other than of reciprocating-piston type with rotary pumps
    • F02B33/36—Engines with pumps other than of reciprocating-piston type with rotary pumps of positive-displacement type
    • F02B33/38—Engines with pumps other than of reciprocating-piston type with rotary pumps of positive-displacement type of Roots type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/04—Mechanical drives; Variable-gear-ratio drives
    • 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

Definitions

  • the present invention relates to a start assist device that uses a supercharger to smoothly start, and relates to a start assist device that makes the start smoother.
  • a starting assistance device in which a supercharger is further added to an engine with a turbocharger, and supercharging at the start is performed in two stages in series.
  • the conventional start assist device 51 includes a turbocharger 7 that drives a compressor 6 disposed in an intake pipe 5 by a turbine 4 disposed in an exhaust pipe 3 of the engine 2, and a shaft of the engine 2. Or the supercharger 9 driven with the electric motor which is not shown in figure is provided. Specifically, the inlet of the turbine 4 of the turbocharger 7 is connected to the exhaust manifold 10 of the engine 2, the turbine 4 and the compressor 6 are connected by a shaft inside the turbocharger 7, and the rotation of the turbine 4 by the exhaust gas is connected to the compressor 6. It is to be transmitted. An intake pipe 5 from the atmosphere is connected to the inlet of the compressor 6 through an air filter (not shown). A supercharge side intake pipe 11 is connected to the outlet of the compressor 6. The supercharging side intake pipe 11 is connected to an intake manifold 13 via an intercooler 12.
  • a bypass pipe 14 having a supercharger 9 is connected to the supercharging side intake pipe 11 between the intercooler 12 and the intake manifold 13.
  • an automatic switching valve 15 that mechanically switches the intake flow path due to a pressure difference is inserted into the supercharging-side intake pipe 11 in parallel with the bypass pipe 14.
  • the automatic switching valve 15 includes a swingable flap, and is opened when the upstream pressure is higher than the downstream, and is closed when the upstream pressure is lower than the downstream.
  • the signal from the engine speed sensor 16 provided in the engine 2 and the signal from the accelerator opening sensor 18 provided in the accelerator pedal 17 are input to the controller 19.
  • the controller 19 is a so-called electronic control unit (ECU), and receives well-known parameter signals for vehicles and engines other than those shown in the figure.
  • ECU electronice control unit
  • the supercharger 9 is connected to a supercharger pulley 21 by an electromagnetic clutch 20 so as to be freely connected and disconnected.
  • the supercharger pulley 21 and the crank pulley 22 attached to the shaft 8 of the engine 2 are connected via a belt 23.
  • the controller 19 operates the electromagnetic clutch 20, the supercharger 9 is driven by the rotation of the engine 2.
  • FIG. 6 shows a simplified intake / exhaust flow for the start assist device of FIG.
  • Exhaust gas from the engine 2 flows to an exhaust purification device (not shown) through the turbine 4 of the turbocharger 7.
  • intake air from an air filter (not shown) is compressed by the compressor 6 of the turbocharger 7 and reaches the engine 2 from the intercooler 12 through the automatic switching valve 15.
  • the supercharger 9 can be used not only at the time of starting but also when the engine speed is low even during normal driving when the engine 2 is in steady operation. As shown in FIG. 7, in the region where the engine rotation speed is as high as 2000 to 6000 rpm, supercharging is performed only by the turbocharger 7. When the engine rotation speed is 2000 rpm or less and a large torque is desired, the supercharger 9 Add supercharging.
  • the fuel consumption is reduced by setting the displacement of 3000 m 3 to 1500 m 3 . That is, the downsizing reduces the weight of the engine 2 and reduces the friction by reducing the size of the parts, thereby reducing fuel consumption.
  • the downsizing reduces the weight of the engine 2 and reduces the friction by reducing the size of the parts, thereby reducing fuel consumption.
  • the supercharger 9 is provided in series with the compressor 6 of the turbocharger 7. That is, the bypass pipe 14 having the supercharger 9 is connected to the supercharging side intake pipe 11 led from the outlet of the compressor 6.
  • an object of the present invention is to provide a start assist device that solves the above-described problems and makes the start more smoothly.
  • the present invention provides a turbocharger that drives a compressor disposed in an intake pipe by a turbine disposed in an exhaust pipe of an engine, and a supercharger that is driven by the shaft of the engine or an electric motor.
  • the intake port of the supercharger is provided closer to the atmosphere than the compressor.
  • the supercharger is a positive displacement supercharger.
  • the present invention exhibits the following excellent effects.
  • a start assist device 1 includes a turbocharger 7 that drives a compressor 6 disposed in an intake pipe 5 by a turbine 4 disposed in an exhaust pipe 3 of the engine 2, and an engine 2.
  • the intake port of the supercharger 9 is provided on the atmosphere side from the compressor 6.
  • the intake port of the supercharger 9 is connected to an outlet of an air filter (not shown), for example.
  • the difference from the conventional start assist device 51 is that the intake port of the supercharger 9 is provided on the atmosphere side from the compressor 6.
  • the supercharger 9 of the conventional starting assistance device 51 is arranged in series with the turbocharger 7
  • the supercharger 9 of the starting assistance device 1 of the present invention is arranged in parallel with the turbocharger 7.
  • the controller determines the start of the vehicle from an appropriate parameter signal, and operates the supercharger 9 at the start.
  • a known positive displacement supercharger such as a roots blower or a Rishorum compressor is used as the supercharger 9.
  • the roots blower which is one of the positive displacement superchargers, accommodates two rotors 42 and 43 in a twin cylindrical compression chamber 41 synthesized so that two cylinders are partially overlapped. It is what.
  • the compression chamber 41 has a cross section in which two circles are partially overlapped.
  • the rotors 42 and 43 rotate around the rotation shafts 44 and 45 respectively located at the two centers of the compression chamber 41 and have a diameter from a convex portion inscribed in the compression chamber 41 to the vicinity of the rotation shafts 44 and 45. The diameter continuously changes to the concave portion that has become smaller.
  • the rotors 42 and 43 are configured to rotate in opposite directions while maintaining a state of being in contact with each other and inscribed in the compression chamber 41.
  • the space in the compression chamber 41 is divided into three airtight spaces by the two rotors 42 and 43.
  • the upper right divided space communicating with the inlet 46 in the illustrated state moves counterclockwise as the rotor 42 rotates and is blocked from the inlet 46, and then communicates with the outlet 47.
  • the lower divided space that does not communicate with the inlet 46 or the outlet 47 moves clockwise as the rotor 43 rotates and communicates with the outlet 47.
  • the controller 19 determines that the vehicle has started and activates the supercharger 9 when the accelerator opening increases when the engine rotational speed is the idle rotational speed, for example. That is, the controller 19 operates the electromagnetic clutch 20 in contact. Since the rotation of the shaft 8 of the engine 2 is transmitted from the crank pulley 22 to the supercharger pulley 21 via the belt 23, when the electromagnetic clutch 20 is actuated, the supercharger 9 is proportional to the engine speed. Rotate.
  • the supercharger 9 immediately starts supercharging when the electromagnetic clutch 20 is engaged. Air from the outlet of the air filter is compressed by the supercharger 9 and reaches the engine 2. At this time, since the pressure at the outlet of the intercooler 12 is lower than the pressure at the outlet of the supercharger 9, the automatic switching valve 15 is closed, and the intake air from the supercharger 9 does not flow back to the intercooler 12. In this way, supercharging by only the supercharger 9 is realized. At this time, unlike the prior art, since there is no resistance to ventilation by the compressor 6 and the intercooler 12 upstream from the inlet of the supercharger 9, air is instantaneously sucked into the supercharger 9 and the supercharging pressure rises quickly. . Thereby, starting becomes smoother than before.
  • the controller 19 disconnects the electromagnetic clutch 20. Since the operation of the supercharger 9 stops and the pressure at the outlet of the intercooler 12 increases, the automatic switching valve 15 is opened, and the air from the turbocharger 7 passes through the intercooler 12 to the engine 2. Be supercharged. At this time, since the supercharger 9 is a positive displacement type, air does not circulate during the stop and does not flow backward.
  • the starting assisting device 1 of the present invention can increase the torque as shown by the solid line because the supercharging pressure by the supercharger 9 rises quickly.
  • the starting assistance device 1 of the present invention can be realized by branching the intake pipe 5 upstream from the compressor 6 and connecting it to the compressor 6 and the supercharger 9. Therefore, only the piping needs to be changed with respect to the conventional start assist device 51, which can be realized with a simple configuration.
  • the controller 19 does not start the vehicle even if the accelerator opening is increased. It is determined from the parameter signal that the vehicle has not started, and in that case, the supercharger 9 is not operated. For example, based on the gear stage signal obtained from the transmission, it can be determined that the vehicle is not starting unless it is the starting gear stage. That is, in the starting assistance device 1 of the present invention, the supercharger 9 is operated only when starting. As a result, the fuel efficiency is improved as compared with the prior art in which the supercharger 9 is operated even at times other than starting.
  • intake air that does not pass through the intercooler 12 is supplied to the engine 2 when the supercharger 9 is operated.
  • the intercooler 12 contributes to improving the engine efficiency by lowering the temperature of the intake air, and the intake air that does not pass through the intercooler 12 is considered to have a high temperature and impair the engine efficiency.
  • the intake air temperature rises due to supercharging when the supercharging rate is considerably high.
  • intake air that does not pass through the intercooler 12 is supplied to the engine 2 only at the time of start. .
  • the supercharger 9 is driven by a belt, but is not limited thereto, and may be driven by a gear or by an electric motor.
  • the start assist device 1 of the present invention is preferably applied to the downsized engine 2, but is not limited to this, and can also be applied to a conventional normal size engine 2.
  • the start assisting device 1 of the present invention improves the start performance compared to the conventional case when the same size supercharger 9 is used as before, but if the start performance may be similar to the conventional case, a smaller supercharger can be used. 9 can be adopted, and further downsizing can be achieved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

Provided is a start-up assist device that makes start-ups take place more smoothly. A start-up assist device (1) comprises: a turbocharger (7) which, by way of a turbine (4)which is positioned in an exhaust pipe (3) of an engine (2), drives a compressor (6) which is positioned in an intake pipe (5); and a supercharger (9) which is driven by a shaft (8) of the engine (2). The intake port of the supercharger (9) is disposed closer than the compressor (6) to the atmosphere.

Description

発進補助装置Starting assistance device
　本発明は、スーパーチャージャを用いて発進を円滑にする発進補助装置に係り、発進がより円滑になる発進補助装置に関する。 The present invention relates to a start assist device that uses a supercharger to smoothly start, and relates to a start assist device that makes the start smoother.
　エンジンにターボチャージャを付加することで、過給を行って吸気量を増加させることができる。しかし、車両の発進性能については、無過給エンジンに比べて過給エンジンは劣る。これは、吸気量が少ない発進直前のアイドル状態から吸気量が十分に増加するまでの応答時間が長いためである。この傾向は、過給率が高いほど顕著となる。 ∙ By adding a turbocharger to the engine, it is possible to increase the intake air amount by supercharging. However, the supercharged engine is inferior to the non-supercharged engine in terms of vehicle start performance. This is because the response time from the idling state immediately before the start when the intake amount is small until the intake amount sufficiently increases is long. This tendency becomes more prominent as the supercharging rate is higher.
　そこで、ターボチャージャを付加したエンジンにさらにスーパーチャージャを追加し、発進時の過給を直列二段で行う発進補助装置が考えられている。 Therefore, a starting assistance device is considered in which a supercharger is further added to an engine with a turbocharger, and supercharging at the start is performed in two stages in series.
　図５に示されるように、従来の発進補助装置５１は、エンジン２の排気管３に配置されたタービン４により吸気管５に配置されたコンプレッサ６を駆動するターボチャージャ７と、エンジン２のシャフト又は図示しない電動モータで駆動されるスーパーチャージャ９とを備える。詳しくは、エンジン２の排気マニホールド１０にターボチャージャ７のタービン４の入口が接続され、タービン４とコンプレッサ６はターボチャージャ７の内部のシャフトで連結され、排気ガスによるタービン４の回転がコンプレッサ６に伝達されるようになっている。コンプレッサ６の入口には図示しないエアフィルタを介して大気からの吸気管５が接続される。コンプレッサ６の出口には、過給側吸気管１１が接続される。過給側吸気管１１は、インタークーラ１２を介して吸気マニホールド１３に接続される。 As shown in FIG. 5, the conventional start assist device 51 includes a turbocharger 7 that drives a compressor 6 disposed in an intake pipe 5 by a turbine 4 disposed in an exhaust pipe 3 of the engine 2, and a shaft of the engine 2. Or the supercharger 9 driven with the electric motor which is not shown in figure is provided. Specifically, the inlet of the turbine 4 of the turbocharger 7 is connected to the exhaust manifold 10 of the engine 2, the turbine 4 and the compressor 6 are connected by a shaft inside the turbocharger 7, and the rotation of the turbine 4 by the exhaust gas is connected to the compressor 6. It is to be transmitted. An intake pipe 5 from the atmosphere is connected to the inlet of the compressor 6 through an air filter (not shown). A supercharge side intake pipe 11 is connected to the outlet of the compressor 6. The supercharging side intake pipe 11 is connected to an intake manifold 13 via an intercooler 12.
　インタークーラ１２と吸気マニホールド１３の間の過給側吸気管１１に、スーパーチャージャ９を有するバイパス管１４が接続される。一方、バイパス管１４と並列になった過給側吸気管１１には、吸気流路が圧力差によって機械的に切り替わる自動切替バルブ１５が挿入される。自動切替バルブ１５は、揺動自在なフラップからなり、下流よりも上流の圧力が高ければ開放され、下流よりも上流の圧力が低ければ閉鎖される。 A bypass pipe 14 having a supercharger 9 is connected to the supercharging side intake pipe 11 between the intercooler 12 and the intake manifold 13. On the other hand, an automatic switching valve 15 that mechanically switches the intake flow path due to a pressure difference is inserted into the supercharging-side intake pipe 11 in parallel with the bypass pipe 14. The automatic switching valve 15 includes a swingable flap, and is opened when the upstream pressure is higher than the downstream, and is closed when the upstream pressure is lower than the downstream.
　エンジン２に設けられたエンジン回転速度センサ１６の信号と、アクセルペダル１７に設けられたアクセル開度センサ１８の信号がコントローラ１９に入力される。コントローラ１９は、いわゆる電子制御装置（ＥＣＵ）であり、図示以外にも車両やエンジンの公知のパラメータ信号が入力される。 The signal from the engine speed sensor 16 provided in the engine 2 and the signal from the accelerator opening sensor 18 provided in the accelerator pedal 17 are input to the controller 19. The controller 19 is a so-called electronic control unit (ECU), and receives well-known parameter signals for vehicles and engines other than those shown in the figure.
　スーパーチャージャ９は、電磁クラッチ２０によりスーパーチャージャ用プーリ２１に断接自在に連結される。スーパーチャージャ用プーリ２１とエンジン２のシャフト８に取り付けられたクランクプーリ２２は、ベルト２３を介して連結される。コントローラ１９が電磁クラッチ２０を作動させると、エンジン２の回転でスーパーチャージャ９が駆動されることになる。 The supercharger 9 is connected to a supercharger pulley 21 by an electromagnetic clutch 20 so as to be freely connected and disconnected. The supercharger pulley 21 and the crank pulley 22 attached to the shaft 8 of the engine 2 are connected via a belt 23. When the controller 19 operates the electromagnetic clutch 20, the supercharger 9 is driven by the rotation of the engine 2.
　スーパーチャージャ９が使用されないときは、コンプレッサ６の出口からの吸気は、インタークーラ１２、自動切替バルブ１５を経て吸気マニホールド１３に導入される。スーパーチャージャ９が使用されると、コンプレッサ６の出口からの吸気は、インタークーラ１２、スーパーチャージャ９を経て吸気マニホールド１３に導入される。この構成により、発進時にスーパーチャージャ９を使用することで、短時間での吸気量の増加が得られるようになり、無過給エンジンと同等の発進性能が期待できる。 When the supercharger 9 is not used, intake air from the outlet of the compressor 6 is introduced into the intake manifold 13 via the intercooler 12 and the automatic switching valve 15. When the supercharger 9 is used, intake air from the outlet of the compressor 6 is introduced into the intake manifold 13 via the intercooler 12 and the supercharger 9. With this configuration, by using the supercharger 9 at the time of starting, the intake amount can be increased in a short time, and starting performance equivalent to that of the non-supercharged engine can be expected.
　図５の発進補助装置について吸排気流れを単純化して図６に示す。エンジン２からの排気ガスは、ターボチャージャ７のタービン４を経て図示しない排気浄化装置に流れる。一方、図示しないエアフィルタからの吸気は、ターボチャージャ７のコンプレッサ６で圧縮され、インタークーラ１２から自動切替バルブ１５を通ってエンジン２に至る。 FIG. 6 shows a simplified intake / exhaust flow for the start assist device of FIG. Exhaust gas from the engine 2 flows to an exhaust purification device (not shown) through the turbine 4 of the turbocharger 7. On the other hand, intake air from an air filter (not shown) is compressed by the compressor 6 of the turbocharger 7 and reaches the engine 2 from the intercooler 12 through the automatic switching valve 15.
　なお、スーパーチャージャ９は、発進時に限らずエンジン２が定常運転されている通常走行時でもエンジン回転速度が低いとき使用することができる。図７に示されるように、エンジン回転速度が２０００～６０００ｒｐｍと高い領域では、ターボチャージャ７のみにより過給を行うが、エンジン回転速度が２０００ｒｐｍ以下において、大きなトルクを得たいとき、スーパーチャージャ９による過給を加える。 The supercharger 9 can be used not only at the time of starting but also when the engine speed is low even during normal driving when the engine 2 is in steady operation. As shown in FIG. 7, in the region where the engine rotation speed is as high as 2000 to 6000 rpm, supercharging is performed only by the turbocharger 7. When the engine rotation speed is 2000 rpm or less and a large torque is desired, the supercharger 9 Add supercharging.
特開２００９－２１００６０号公報JP 2009-210602 A
　ところで、近年では、エンジン２をダウンサイジングすることが要求される。例えば、排気量３０００ｍ3を１５００ｍ3にすることで、燃費の低減を図る。すなわち、ダウンサイジングにより、エンジン２が軽量化されると共に部品の小型化によって摩擦が低減されて燃費が低減できる。また、同じ出力を得るのに、排気量の大きいエンジン２を低トルク領域で稼動させるより、排気量の小さいエンジン２を高トルク領域で稼動させるほうが効率が良く、燃費が低減できることが知られている。 Incidentally, in recent years, it is required to downsize the engine 2. For example, the fuel consumption is reduced by setting the displacement of 3000 m 3 to 1500 m 3 . That is, the downsizing reduces the weight of the engine 2 and reduces the friction by reducing the size of the parts, thereby reducing fuel consumption. In addition, it is known that to obtain the same output, it is more efficient to operate the engine 2 with a small displacement in the high torque region than to operate the engine 2 with a large displacement in the low torque region, and the fuel consumption can be reduced. Yes.
　エンジン２をダウンサイジングして同じ出力を得るためには、過給率を高くすることが必要となる。前述したように、過給率を高くすると発進時の吸気量増加が遅れるので、スーパーチャージャ９が必要となる。 In order to obtain the same output by downsizing the engine 2, it is necessary to increase the supercharging rate. As described above, if the supercharging rate is increased, an increase in the intake air amount at the time of start is delayed, so the supercharger 9 is required.
　しかし、従来の発進補助装置５１は、ターボチャージャ７のコンプレッサ６に対してスーパーチャージャ９が直列に設けられている。すなわち、コンプレッサ６の出口から導かれた過給側吸気管１１にスーパーチャージャ９を有するバイパス管１４が接続されている。 However, in the conventional starting assistance device 51, the supercharger 9 is provided in series with the compressor 6 of the turbocharger 7. That is, the bypass pipe 14 having the supercharger 9 is connected to the supercharging side intake pipe 11 led from the outlet of the compressor 6.
　このため、発進時のスーパーチャージャ作動時に、コンプレッサ６とインタークーラ１２を経由してスーパーチャージャ９に空気が入る。このときターボチャージャ７の回転がまだ上昇していないので、コンプレッサ６のブレードが通気の抵抗となり、さらにインタークーラ１２の熱交換器が通気の抵抗となるため、スーパーチャージャ９に空気が入りにくくなる。これに加え、インタークーラ１２の容積が大きいため、スーパーチャージャ９の吸い込みに対する応答が遅れる。これらの要因のため、過給圧が上がりにくくなる。この結果、スーパーチャージャ９で過給することにより発進を円滑にする効果がそがれ、期待通りには発進が補助できない。 Therefore, air enters the supercharger 9 via the compressor 6 and the intercooler 12 when the supercharger is activated at the start. At this time, since the rotation of the turbocharger 7 has not yet risen, the blades of the compressor 6 provide resistance to ventilation, and the heat exchanger of the intercooler 12 provides resistance to ventilation, so that it is difficult for air to enter the supercharger 9. . In addition, since the volume of the intercooler 12 is large, the response to the suction of the supercharger 9 is delayed. Because of these factors, the boost pressure is difficult to increase. As a result, the supercharger 9 supercharges the effect of smooth start, and start cannot be assisted as expected.
　そこで、本発明の目的は、上記課題を解決し、発進がより円滑になる発進補助装置を提供することにある。 Therefore, an object of the present invention is to provide a start assist device that solves the above-described problems and makes the start more smoothly.
　上記目的を達成するために本発明は、エンジンの排気管に配置されたタービンにより吸気管に配置されたコンプレッサを駆動するターボチャージャと、前記エンジンのシャフト又は電動モータで駆動されるスーパーチャージャとを備えた発進補助装置において、前記スーパーチャージャの吸気入口が前記コンプレッサより大気側に設けられたものである。 To achieve the above object, the present invention provides a turbocharger that drives a compressor disposed in an intake pipe by a turbine disposed in an exhaust pipe of an engine, and a supercharger that is driven by the shaft of the engine or an electric motor. In the starting assistance apparatus provided, the intake port of the supercharger is provided closer to the atmosphere than the compressor.
　前記スーパーチャージャが容積型スーパーチャージャであること。 The supercharger is a positive displacement supercharger.
　本発明は次の如き優れた効果を発揮する。 The present invention exhibits the following excellent effects.
　（１）発進がより円滑になる。 (1) Start is smoother.
本発明の一実施形態を示す発進補助装置の吸排気流れ図である。It is an intake-exhaust flow chart of the starting assistance device showing one embodiment of the present invention. 容積型スーパーチャージャの断面図である。It is sectional drawing of a positive displacement supercharger. 本発明の発進補助装置における発進時過給器切り替えの特性図である。It is a characteristic view of supercharger switching at the time of start in the start auxiliary device of the present invention. 本発明の一実施形態を示す発進補助装置の上面図である。It is a top view of the starting assistance apparatus which shows one Embodiment of this invention. 従来の発進補助装置の上面図である。It is a top view of the conventional starting assistance apparatus. 従来の発進補助装置の吸排気流れ図である。It is an intake / exhaust flow diagram of a conventional start assist device. 従来の発進補助装置におけるエンジン回転速度と出力トルクに対する過給器切り替えの特性図である。It is a characteristic diagram of the supercharger switching with respect to the engine speed and output torque in the conventional starting assistance apparatus.
　以下、本発明の一実施形態を添付図面に基づいて詳述する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
　図１に示されるように、本発明に係る発進補助装置１は、エンジン２の排気管３に配置されたタービン４により吸気管５に配置されたコンプレッサ６を駆動するターボチャージャ７と、エンジン２のシャフト８で駆動されるスーパーチャージャ９とを備えた発進補助装置１において、スーパーチャージャ９の吸気入口がコンプレッサ６より大気側に設けられたものである。スーパーチャージャ９の吸気入口は、例えば、図示しないエアフィルタの出口に接続される。 As shown in FIG. 1, a start assist device 1 according to the present invention includes a turbocharger 7 that drives a compressor 6 disposed in an intake pipe 5 by a turbine 4 disposed in an exhaust pipe 3 of the engine 2, and an engine 2. In the starting assistance device 1 provided with the supercharger 9 driven by the shaft 8, the intake port of the supercharger 9 is provided on the atmosphere side from the compressor 6. The intake port of the supercharger 9 is connected to an outlet of an air filter (not shown), for example.
　図６との比較で分かるように、従来の発進補助装置５１との相違点は、スーパーチャージャ９の吸気入口がコンプレッサ６より大気側に設けられた点である。従来の発進補助装置５１のスーパーチャージャ９がターボチャージャ７と直列配置であるのに対し、本発明の発進補助装置１のスーパーチャージャ９はターボチャージャ７と並列配置となる。 As can be seen from a comparison with FIG. 6, the difference from the conventional start assist device 51 is that the intake port of the supercharger 9 is provided on the atmosphere side from the compressor 6. Whereas the supercharger 9 of the conventional starting assistance device 51 is arranged in series with the turbocharger 7, the supercharger 9 of the starting assistance device 1 of the present invention is arranged in parallel with the turbocharger 7.
　また、本発明の発進補助装置１では、コントローラ（図４参照）は、適宜なパラメータ信号から車両の発進を判定し、発進時にはスーパーチャージャ９を作動させるようになっている。 In the start assisting device 1 of the present invention, the controller (see FIG. 4) determines the start of the vehicle from an appropriate parameter signal, and operates the supercharger 9 at the start.
　また、本発明の発進補助装置１では、スーパーチャージャ９には、ルーツブロア、リショルムコンプレッサ等の公知の容積型スーパーチャージャが使用される。 In the start assisting device 1 of the present invention, a known positive displacement supercharger such as a roots blower or a Rishorum compressor is used as the supercharger 9.
　図１中、従来の発進補助装置５１と同等の部材は、説明を省略する。 In FIG. 1, the description of the same members as those of the conventional start assist device 51 is omitted.
　容積型スーパーチャージャのひとつであるルーツブロアは、図２に示されるように、２つの円筒が部分的に重ねられるように合成された双子円筒形の圧縮室４１に２つの回転子４２，４３を収容したものである。圧縮室４１は、２つの円形を部分的に重ねたような断面を有する。各回転子４２，４３は、圧縮室４１の２つの中心にそれぞれ位置する回転軸４４，４５の回りを回転するもので、圧縮室４１に内接する凸部から回転軸４４，４５近くまで径が小さくなった凹部まで連続的に径が変化している。各回転子４２，４３は、相互に接しかつ圧縮室４１に内接した状態を保ちつつ、互いに逆方向に回転するようになっている。圧縮室４１内の空間は、２つの回転子４２，４３によって、３つの気密な空間に分割される。分割空間のうち、図示状態で入口４６に連通している右上の分割空間が回転子４２の回転に伴って左回りに移動して入口４６から遮断され、その後、出口４７に連通する。図示状態で入口４６にも出口４７にも連通していない下の分割空間は回転子４３の回転に伴って右回りに移動して出口４７に連通する。 As shown in FIG. 2, the roots blower, which is one of the positive displacement superchargers, accommodates two rotors 42 and 43 in a twin cylindrical compression chamber 41 synthesized so that two cylinders are partially overlapped. It is what. The compression chamber 41 has a cross section in which two circles are partially overlapped. The rotors 42 and 43 rotate around the rotation shafts 44 and 45 respectively located at the two centers of the compression chamber 41 and have a diameter from a convex portion inscribed in the compression chamber 41 to the vicinity of the rotation shafts 44 and 45. The diameter continuously changes to the concave portion that has become smaller. The rotors 42 and 43 are configured to rotate in opposite directions while maintaining a state of being in contact with each other and inscribed in the compression chamber 41. The space in the compression chamber 41 is divided into three airtight spaces by the two rotors 42 and 43. Of the divided spaces, the upper right divided space communicating with the inlet 46 in the illustrated state moves counterclockwise as the rotor 42 rotates and is blocked from the inlet 46, and then communicates with the outlet 47. In the illustrated state, the lower divided space that does not communicate with the inlet 46 or the outlet 47 moves clockwise as the rotor 43 rotates and communicates with the outlet 47.
　以下、本発明の発進補助装置１の動作を説明する。 Hereinafter, the operation of the starting assistance device 1 of the present invention will be described.
　コントローラ１９は、例えば、エンジン回転速度がアイドル回転速度のときにアクセル開度が大きくなると、車両の発進と判定してスーパーチャージャ９を作動させる。すなわち、コントローラ１９は、電磁クラッチ２０を接に作動させる。エンジン２のシャフト８の回転がクランクプーリ２２からベルト２３を介してスーパーチャージャ用プーリ２１に伝達されているため、電磁クラッチ２０が接に作動されると、スーパーチャージャ９はエンジン回転速度に比例して回転する。 The controller 19 determines that the vehicle has started and activates the supercharger 9 when the accelerator opening increases when the engine rotational speed is the idle rotational speed, for example. That is, the controller 19 operates the electromagnetic clutch 20 in contact. Since the rotation of the shaft 8 of the engine 2 is transmitted from the crank pulley 22 to the supercharger pulley 21 via the belt 23, when the electromagnetic clutch 20 is actuated, the supercharger 9 is proportional to the engine speed. Rotate.
　スーパーチャージャ９は、電磁クラッチ２０の接により、即座に過給を開始することになる。エアフィルタの出口からの空気がスーパーチャージャ９で圧縮され、エンジン２に至る。このとき、インタークーラ１２の出口の圧力はスーパーチャージャ９の出口の圧力より低いので、自動切替バルブ１５は閉鎖され、スーパーチャージャ９による吸気がインタークーラ１２に逆流することがない。このようにして、スーパーチャージャ９のみによる過給が実現される。このとき、従来技術とは異なり、スーパーチャージャ９の入口より上流にはコンプレッサ６やインタークーラ１２による通気の抵抗がないため、瞬時にスーパーチャージャ９に空気が吸い込まれ、過給圧が迅速に立ち上がる。これにより、従来よりも発進が円滑になる。 The supercharger 9 immediately starts supercharging when the electromagnetic clutch 20 is engaged. Air from the outlet of the air filter is compressed by the supercharger 9 and reaches the engine 2. At this time, since the pressure at the outlet of the intercooler 12 is lower than the pressure at the outlet of the supercharger 9, the automatic switching valve 15 is closed, and the intake air from the supercharger 9 does not flow back to the intercooler 12. In this way, supercharging by only the supercharger 9 is realized. At this time, unlike the prior art, since there is no resistance to ventilation by the compressor 6 and the intercooler 12 upstream from the inlet of the supercharger 9, air is instantaneously sucked into the supercharger 9 and the supercharging pressure rises quickly. . Thereby, starting becomes smoother than before.
　発進後、ある程度（例えば、２秒）時間が経過すると、ターボチャージャ７の回転が上昇し、ターボチャージャ７のみでエンジン２が運転可能となる。そこで、コントローラ１９は、電磁クラッチ２０を断にする。スーパーチャージャ９の作動が停止し、その一方で、インタークーラ１２の出口の圧力が上昇してくるので、自動切替バルブ１５は開放され、ターボチャージャ７からの空気がインタークーラ１２を経てエンジン２に過給されるようになる。このとき、スーパーチャージャ９は、容積型であるので、停止中は空気が流通せず、逆流することがない。 When a certain amount of time (for example, 2 seconds) elapses after starting, the rotation of the turbocharger 7 rises and the engine 2 can be operated only by the turbocharger 7. Therefore, the controller 19 disconnects the electromagnetic clutch 20. Since the operation of the supercharger 9 stops and the pressure at the outlet of the intercooler 12 increases, the automatic switching valve 15 is opened, and the air from the turbocharger 7 passes through the intercooler 12 to the engine 2. Be supercharged. At this time, since the supercharger 9 is a positive displacement type, air does not circulate during the stop and does not flow backward.
　図３に示されるように、エンジン２が定常運転されている通常走行時、エンジン回転速度が１０００ｒｐｍ程度では、一点鎖線で示すように、トルクは小さい。エンジン２の暖気が不十分な走行開始時は、二点鎖線で示すように、トルクはさらに小さい。このような状況で発進を行うとき、本発明の発進補助装置１は、スーパーチャージャ９による過給圧が迅速に立ち上がるので、実線で示すように、トルクが大きくできる。 As shown in FIG. 3, during normal running when the engine 2 is in steady operation, the torque is small as indicated by the alternate long and short dash line at an engine speed of about 1000 rpm. When the engine 2 starts running with insufficient warm-up, the torque is even smaller, as indicated by the two-dot chain line. When starting in such a situation, the starting assisting device 1 of the present invention can increase the torque as shown by the solid line because the supercharging pressure by the supercharger 9 rises quickly.
　図４に示されるように、本発明の発進補助装置１は、コンプレッサ６より上流で吸気管５を分岐してコンプレッサ６とスーパーチャージャ９に接続することで実現できる。従って、従来の発進補助装置５１に対して配管のみを変更すればよく、簡素な構成で実現できる。 As shown in FIG. 4, the starting assistance device 1 of the present invention can be realized by branching the intake pipe 5 upstream from the compressor 6 and connecting it to the compressor 6 and the supercharger 9. Therefore, only the piping needs to be changed with respect to the conventional start assist device 51, which can be realized with a simple configuration.
　ところで、坂路下りのように無負荷時に惰行走行してエンジン２をアイドル回転速度にしているときは、アクセル開度が大きくなっても、車両の発進ではないので、コントローラ１９は、車速やその他のパラメータ信号から車両の発進ではないことを判定し、その場合はスーパーチャージャ９を作動させない。例えば、変速機から得られるギア段信号に基づき、発進ギア段でなければ車両の発進でないと判定することができる。すなわち、本発明の発進補助装置１では、スーパーチャージャ９を発進のときのみしか作動させない。これにより、スーパーチャージャ９を発進以外のときにも作動させていた従来技術に比べて、燃費が改善される。 By the way, when the engine 2 is set to the idling rotational speed while coasting when there is no load, such as downhill, the controller 19 does not start the vehicle even if the accelerator opening is increased. It is determined from the parameter signal that the vehicle has not started, and in that case, the supercharger 9 is not operated. For example, based on the gear stage signal obtained from the transmission, it can be determined that the vehicle is not starting unless it is the starting gear stage. That is, in the starting assistance device 1 of the present invention, the supercharger 9 is operated only when starting. As a result, the fuel efficiency is improved as compared with the prior art in which the supercharger 9 is operated even at times other than starting.
　本発明の発進補助装置１では、スーパーチャージャ９の作動時はインタークーラ１２を通らない吸気がエンジン２に供給される。一般に、インタークーラ１２は吸気の温度を低下させることでエンジン効率の向上に寄与しており、インタークーラ１２を通さない吸気は温度が高くエンジン効率を損なうと考えられている。しかし、過給によって吸気温度が上がるのは過給率が相当に高いときである。その点、本発明の発進補助装置１では、発進時のみインタークーラ１２を通らない吸気がエンジン２に供給されるのであり、その時の吸気温度はエンジン効率に影響するほど高くはないので、問題ない。 In the start assist device 1 of the present invention, intake air that does not pass through the intercooler 12 is supplied to the engine 2 when the supercharger 9 is operated. In general, the intercooler 12 contributes to improving the engine efficiency by lowering the temperature of the intake air, and the intake air that does not pass through the intercooler 12 is considered to have a high temperature and impair the engine efficiency. However, the intake air temperature rises due to supercharging when the supercharging rate is considerably high. In that respect, in the start assisting device 1 of the present invention, intake air that does not pass through the intercooler 12 is supplied to the engine 2 only at the time of start. .
　本実施形態では、スーパーチャージャ９をベルト駆動としたが、これに限らず、ギア駆動でもよいし、電動モータで駆動するようにしてもよい。 In the present embodiment, the supercharger 9 is driven by a belt, but is not limited thereto, and may be driven by a gear or by an electric motor.
　本発明の発進補助装置１は、ダウンサイジングされたエンジン２に好適に適用されるが、これに限らず、従来どおりの通常サイズのエンジン２に対しても適用することができる。 The start assist device 1 of the present invention is preferably applied to the downsized engine 2, but is not limited to this, and can also be applied to a conventional normal size engine 2.
　本発明の発進補助装置１は、従来と同一サイズのスーパーチャージャ９を用いた場合に、従来より発進性能が向上するが、発進性能は従来と同程度でよいとした場合、より小型のスーパーチャージャ９を採用することができ、いっそうのダウンサイジングを図ることができる。 The start assisting device 1 of the present invention improves the start performance compared to the conventional case when the same size supercharger 9 is used as before, but if the start performance may be similar to the conventional case, a smaller supercharger can be used. 9 can be adopted, and further downsizing can be achieved.
　１　発進補助装置
　２　エンジン
　３　排気管
　４　タービン
　５　吸気管
　６　コンプレッサ
　７　ターボチャージャ
　８　シャフト
　９　スーパーチャージャ DESCRIPTION OF SYMBOLS 1 Start assistance device 2 Engine 3 Exhaust pipe 4 Turbine 5 Intake pipe 6 Compressor 7 Turbocharger 8 Shaft 9 Supercharger

Claims (2)

  1. 　エンジンの排気管に配置されたタービンにより吸気管に配置されたコンプレッサを駆動するターボチャージャと、前記エンジンのシャフト又は電動モータで駆動されるスーパーチャージャとを備えた発進補助装置において、
    　前記スーパーチャージャの吸気入口が前記コンプレッサより大気側に設けられたことを特徴とする発進補助装置。     In a starting assistance device comprising a turbocharger that drives a compressor arranged in an intake pipe by a turbine arranged in an exhaust pipe of an engine, and a supercharger that is driven by a shaft of the engine or an electric motor,
    A start assisting device, wherein the intake port of the supercharger is provided on the atmosphere side of the compressor.
  2. 　前記スーパーチャージャが容積型スーパーチャージャであることを特徴とする請求項１記載の発進補助装置。 The start assisting device according to claim 1, wherein the supercharger is a positive displacement supercharger.
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US20150240826A1 (en) * 2012-09-11 2015-08-27 IFP Energies Nouvelles Method of determining a pressure upstream of a compressor for an engine equipped with double supercharging
US20230014159A1 (en) * 2021-07-14 2023-01-19 Southwest Research Institute Internal Combustion Engine Air Intake System for Avoiding Turbocharger Surge

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KR101786331B1 (en) 2016-04-20 2017-10-17 현대자동차주식회사 Intercooler device for engine

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US20150240826A1 (en) * 2012-09-11 2015-08-27 IFP Energies Nouvelles Method of determining a pressure upstream of a compressor for an engine equipped with double supercharging
US9739281B2 (en) * 2012-09-11 2017-08-22 IFP Energies Nouvelles Method of determining a pressure upstream of a compressor for an engine equipped with double supercharging
US20230014159A1 (en) * 2021-07-14 2023-01-19 Southwest Research Institute Internal Combustion Engine Air Intake System for Avoiding Turbocharger Surge

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