JPH0270921A - Supercharger for engine for vehicle - Google Patents

Supercharger for engine for vehicle

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Publication number
JPH0270921A
JPH0270921A JP62322759A JP32275987A JPH0270921A JP H0270921 A JPH0270921 A JP H0270921A JP 62322759 A JP62322759 A JP 62322759A JP 32275987 A JP32275987 A JP 32275987A JP H0270921 A JPH0270921 A JP H0270921A
Authority
JP
Japan
Prior art keywords
pressurized air
engine
injection nozzle
supercharging
pipe
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.)
Pending
Application number
JP62322759A
Other languages
Japanese (ja)
Inventor
Takahiko Ito
孝彦 伊東
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to JP62322759A priority Critical patent/JPH0270921A/en
Publication of JPH0270921A publication Critical patent/JPH0270921A/en
Pending legal-status Critical Current

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  • Supercharger (AREA)

Abstract

PURPOSE:To make it possible to supplement the shortage portion in the supercharge by a turbocompressor by installing an injection pump in parallel to or in series with the turbocompressor in the intake passage of an engine and a pressurized air feeding means into the injection nozzle of the injection pump. CONSTITUTION:In series with or in parallel to an intake supercharge compressor 5b driven by an exhaust turbine 5a, a bypass pipe 10 which constitutes an injection pump and a pressurized air reservoir 24 into which the pressurized air is jetted from an injection nozzle 19 are installed. As a result, even if the engine operation state is in a range in which the necessary supercharge pressure can not be obtained by the turbocompressor 5b, the necessary supercharge pressure can be obtained speedily. Then, the sharp increase of output can be secured, compensating the lag in the output increase due to the time lag of the supercharger. Further, the time lag of the supercharger can be reduced markedly.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はエンジンの排気ガスによって駆動される車両用
エンジンの過給装置に関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a supercharging device for a vehicle engine driven by engine exhaust gas.

(従来技術) 内燃機関の出力を向上させる手段として排気ガスタービ
ン過給装置、いわゆるターボチャージャーが古くから実
用に供されて著しい効果をあげている。特にディーゼル
エンジンと航空エンジンにおいてひろく普及している。
(Prior Art) Exhaust gas turbine supercharging devices, so-called turbochargers, have been in practical use for a long time as a means for improving the output of internal combustion engines, and have achieved remarkable effects. It is especially widespread in diesel engines and aero engines.

ターボチャージャーは近年、自動車等の車両にまて使用
されるようになり、それなりの効果をあげているか、車
両のエンジンは運転条件か広範囲に変化するのでエンジ
ン回転数やエンジン負荷トルク等がターボチャージャー
の正常な動作範囲から外れる場合もある。その典型的な
例は上り坂での発進直後のようにエンジンが低速回転数
でありながら高トルクか要求される場合である。この場
合にはエンジン回転数か低いので排気流量か少なくて、
排気タービルの回転数か上らないため、吸気の過給かで
きない。したかって、エンジンは無過給に近い状態で運
転され、軸負荷が加速可能であれば徐々に回転数か上っ
てゆき、排気量の増大に伴って過給可能領域に達すると
はじめて過給の効果か現われ、エンジンの出力か増大し
、正常な過給運転に移行する。それまでに要する時間遅
れはいわゆるターボラフと呼ばれている。
In recent years, turbochargers have come to be used in vehicles such as automobiles, and they have been shown to be effective to some extent.Since the operating conditions of a vehicle's engine vary widely, engine speed, engine load torque, etc. may be outside the normal operating range. A typical example is when high torque is required even though the engine is running at a low speed, such as immediately after starting up an uphill slope. In this case, the engine speed is low, so the exhaust flow rate is low,
Since the rotation speed of the exhaust turbine does not increase, it is not possible to supercharge the intake air. Therefore, the engine is operated in a state close to no supercharging, and if the shaft load can be accelerated, the rotation speed will gradually increase, and supercharging will start only when the engine reaches the range where supercharging is possible as the displacement increases. The effect appears, the engine output increases, and normal supercharging operation begins. The time delay required until then is called turbo rough.

このようなターボチャージャーに特有な特性を改善する
ために、従来、排気速度を上げて過給圧を得るための可
変スクロールを用いたり、タービンロータの軽量化によ
って特性の改善を試みたりしているか、いずれも部分的
に改善されるに過ぎない。
In order to improve the characteristics unique to such turbochargers, attempts have been made to improve the characteristics by increasing the exhaust speed and obtaining boost pressure by using variable scrolls, or by reducing the weight of the turbine rotor. , all of which are only partially improved.

(発明の目的および構成) 本発明は上記の点にかんがみてなされたもので、エンジ
ンの運転状態がターボコンプレッサによっては必要な過
給圧が得られない範囲にあっても、エンジンが必要とす
る過給圧を得ることを目的とし、この目的を大幅なコス
ト上昇を招くことなく達成するために、エンジンの吸気
経路のターボコンプレッサと並列または直列に噴流ポン
プおよび噴流ポンプの噴射ノズルに加圧空気供給手段を
設け、ターボコンプレッサによる過給の不足分を補充す
るように構成した。
(Purpose and Structure of the Invention) The present invention has been made in view of the above points, and provides that even if the operating state of the engine is in a range in which the necessary boost pressure cannot be obtained depending on the turbo compressor, the The purpose is to obtain boost pressure, and in order to achieve this purpose without incurring a significant increase in costs, pressurized air is supplied to the jet pump and the injection nozzle of the jet pump in parallel or in series with the turbo compressor in the intake path of the engine. A supply means was provided to supplement the lack of supercharging provided by the turbo compressor.

(実施例) 以下本発明を図面に基づいて説明する。(Example) The present invention will be explained below based on the drawings.

第1図は本発明による過給装置をディーゼルエンジンに
適用した例を示しており、lはエンジンのシリンダ、2
はピストン、3は排気バルブ、4は吸気バルブ、5は排
気タービン5aとコンプレッサ5bとから成るターボチ
ャージャー 6は燃料噴射ノズル、7は図示しない燃料
噴射ポンプから燃料噴射ノズル6に燃料を圧送する燃料
バイ7.8はコンプレッサ5bからエンジンに至る吸気
管、9はエアフィルタからコンプレッサ5bに至る吸気
管、lOは噴流ポンプを構成するバイパス管、11は吸
気流路を切替えるリードバルブ、12は過給圧によって
燃料噴射量を調節するための噴射ポンプへの連絡管、1
3は過給圧センサ15への連絡管、14はコンプレッサ
出口圧センサ16への連絡管、17は排気タービン5a
を経て排気管18に至る途中に設けた熱交換器である。
FIG. 1 shows an example in which the supercharging device according to the present invention is applied to a diesel engine, where l is the engine cylinder, and 2
3 is a piston, 3 is an exhaust valve, 4 is an intake valve, 5 is a turbocharger consisting of an exhaust turbine 5a and a compressor 5b, 6 is a fuel injection nozzle, and 7 is a fuel that pumps fuel from a fuel injection pump (not shown) to the fuel injection nozzle 6. 7.8 is an intake pipe from the compressor 5b to the engine, 9 is an intake pipe from the air filter to the compressor 5b, 1O is a bypass pipe that constitutes a jet pump, 11 is a reed valve that switches the intake flow path, and 12 is a supercharging pipe. A connecting pipe to the injection pump for adjusting the fuel injection amount by pressure, 1
3 is a communication pipe to the boost pressure sensor 15, 14 is a communication pipe to the compressor outlet pressure sensor 16, and 17 is an exhaust turbine 5a.
This is a heat exchanger provided on the way to the exhaust pipe 18 via the exhaust pipe 18.

19はバイパス管lOの中に加圧空気を噴出させる噴射
ノズル、20は加圧空気を噴射ノズルに送る管路である
19 is an injection nozzle for ejecting pressurized air into the bypass pipe IO, and 20 is a pipe line for sending pressurized air to the injection nozzle.

加圧空気は熱交換器17の中の加圧空気加熱管17a内
で加熱されて噴射ノズル19に送られる。21は噴射さ
れる空気圧を検出するセンサ22へ至る連絡管である。
The pressurized air is heated in a pressurized air heating tube 17a in the heat exchanger 17 and sent to the injection nozzle 19. 21 is a communication pipe leading to a sensor 22 that detects the air pressure to be injected.

23は加圧空気の噴射を制御する制御弁、24は加圧空
気を貯留するタンク、25は図示しない空気圧縮ポンプ
の吐出口に至る加圧空気補給管である。26は加圧空気
噴射制御装置で、圧力センサ15,16.22から信号
ケーブル27,28.29を経て圧力信号を入力する。
23 is a control valve for controlling the injection of pressurized air, 24 is a tank for storing pressurized air, and 25 is a pressurized air supply pipe leading to a discharge port of an air compression pump (not shown). 26 is a pressurized air injection control device which inputs pressure signals from pressure sensors 15, 16.22 via signal cables 27, 28.29.

30は図示しないアクセルペダル踏込み量検出装置から
加圧空気噴射制御装置26に至る信号ケーブル、31は
図示しないエンジン回転数検出装置から加圧空気噴射ノ
ズルM26に至る信号ケーブルである。加圧空気噴射制
御弁23は加圧空気噴射制御装置26から出カケープル
32を経て制御、され、加圧空気りよ加圧空気タンク2
4から噴射制御弁23に供給される。
30 is a signal cable from an accelerator pedal depression amount detection device (not shown) to the pressurized air injection control device 26, and 31 is a signal cable from the engine rotation speed detection device (not shown) to the pressurized air injection nozzle M26. The pressurized air injection control valve 23 is controlled from the pressurized air injection control device 26 via the output cable 32, and the pressurized air is connected to the pressurized air tank 2.
4 to the injection control valve 23.

なお、吸気管8とバイパス管10との合流部の形状を工
夫すれば、コンプレッサ5bに吸気の逆流か生しないよ
うにすることができ、この場合はり−トハルブ11.l
laを省略することができる。
Note that by devising the shape of the confluence of the intake pipe 8 and the bypass pipe 10, it is possible to prevent the intake air from flowing backward into the compressor 5b. l
la can be omitted.

次に上記過給装置の動作を説明する。Next, the operation of the above-mentioned supercharging device will be explained.

リートバルブ11は加圧空気噴射ノズル19から加圧空
気の噴射が行なわれ、吸気管9およびバイパス管10を
経てエンジンに吸気が送られている状態を示す。
The Riet valve 11 is shown in a state where pressurized air is injected from a pressurized air injection nozzle 19 and intake air is sent to the engine via the intake pipe 9 and the bypass pipe 10.

加圧空気噴射制御装置26に入力される各センサからの
信号によって制御弁23か閉じられると、噴射ノズル1
9からの加圧空気噴射が停止され、コンプレッサ5bか
作動していればリードバルブllは支点11aを中心に
バイパス管10の出口を塞ぐように変位する。リードバ
ルブ11にアクチュエータを付加して制御装置によって
強制的に変位させてもよい、エンジンがアイドリング状
態にあるときまたはエンジンブレーキ状態にあってコン
プレッサ5bが正常に作動していない場合はリードバル
ブ11はどの位置にあってもよい 熱交換器17は原理的には不要であるが、加圧空気の圧
力が高い場合は噴射ノズル19におけるポリトロープ膨
張によって噴射空気の温度か低下して噴射ノズル19に
氷結を生ずるのを防止する、加圧空気のエンタルピを増
大させて噴射空気量を節減させることに役立ち、またガ
ソリンエンジンの場合には、過給吸気の温度が急変する
ことは混合比制御の上で好ましくなく、噴射空気加熱の
重要性か高い。本実施例てはバイパス管lOを設けてそ
の中に加圧空気噴射ノズル19を配置したか、バイパス
管lOを設けないで吸気管8の途中に加圧空気噴射ノス
ル19を設けて、吸気管を噴流ポンプとして利用するこ
ともできる。この場合にはリードバルブ11は省略でき
る。
When the control valve 23 is closed by signals from each sensor input to the pressurized air injection control device 26, the injection nozzle 1
If the compressor 5b is in operation, the reed valve ll is displaced about the fulcrum 11a so as to close the outlet of the bypass pipe 10. An actuator may be added to the reed valve 11 and the reed valve 11 may be forcibly displaced by a control device.When the engine is idling or under engine braking and the compressor 5b is not operating normally, the reed valve 11 The heat exchanger 17, which can be located at any position, is not necessary in principle, but when the pressure of the pressurized air is high, the temperature of the injection air decreases due to polytropic expansion in the injection nozzle 19, causing ice to form on the injection nozzle 19. It is useful for reducing the amount of injection air by increasing the enthalpy of the pressurized air, and in the case of gasoline engines, sudden changes in the temperature of the supercharged intake air can be This is not desirable, and the importance of heating the injection air is high. In this embodiment, a bypass pipe 10 is provided and the pressurized air injection nozzle 19 is disposed therein, or the bypass pipe 10 is not provided and the pressurized air injection nozzle 19 is provided in the middle of the intake pipe 8, and the pressurized air injection nozzle 19 is provided in the intake pipe. It can also be used as a jet pump. In this case, the reed valve 11 can be omitted.

第2図、第3図、第4図、第5図は平坦な舗装路面上に
おける最大積載量の荷重を積載した手動変速機付き車両
の加速試験を行った結果を示している。各グラフの時間
軸はすべて同一である。
Figures 2, 3, 4, and 5 show the results of an acceleration test on a vehicle with a manual transmission loaded with the maximum load on a flat paved road surface. The time axes of each graph are all the same.

各グラフにおいて、時刻T。まではアクセルペダルから
足を離した状ぶて走行しており、時刻T、でアクセルを
全ストローク踏み込んで加速を開始する。第2図は時間
の経過に対して変化する過給圧で、グラフ33は本発明
による過給装置を装着したもの、グラフ34は従来の例
である。また、第3図は本発明による過給装置の加圧空
気噴射量の変化を示しており、グラフ35中の35aは
制御系で伝達関数に起因するオーバーシュートて、設計
の如何によっては除去することかできるが、多少発生す
る程度か応答性がよい。
In each graph, time T. Until then, the vehicle has been driving as if it had taken its foot off the accelerator pedal, and at time T, the vehicle depresses the accelerator to its full stroke and starts accelerating. FIG. 2 shows the supercharging pressure changing over time, graph 33 shows the supercharging device according to the present invention installed, and graph 34 shows the conventional example. Further, Fig. 3 shows the change in the pressurized air injection amount of the supercharging device according to the present invention, and 35a in the graph 35 indicates an overshoot caused by the transfer function in the control system, which can be removed depending on the design. It is possible to do this, but it only occurs to some extent and the responsiveness is good.

第4図はトルクの様子を示すグラフで、グラフ36は本
発明による過給装置を装着したもの、グラフ37は従来
例、第5図はエンジン回転数で、車速に相当する。図中
グラフ38は本発明による過給装置を装着したもの、グ
ラフ39は従来例である。
FIG. 4 is a graph showing the state of torque, graph 36 shows the supercharging device according to the present invention, graph 37 shows the conventional example, and FIG. 5 shows the engine speed, which corresponds to the vehicle speed. In the figure, a graph 38 shows a car equipped with a supercharging device according to the present invention, and a graph 39 shows a conventional example.

第2図〜第4図かられかるように、本発明による過給装
置の装着によってエンジンの低速トルクか大幅に上昇し
て車両の加速性が向上する。また、エンジン回転数か低
いところから過給か行なわれるので1回転数か低いとこ
ろても排気量および排気エネルギーか大きくなり、排気
タービンの出力が十分に得られる。これによって加圧空
気噴射時間が一層短くなることか示されている。加圧空
気タンク24に、加圧空気を補給する空気圧縮機は車両
走行中の余剰エネルギーを利用してもよい。たとえばブ
レーキ(エンジンブレーキ)使用時に重点的に圧縮機を
駆動したりあるいはターボチャージャーに発電機を装着
し、排気タービンの余剰出力を利用して圧縮機を駆動し
てもよい、またブレーキ用空気圧縮機を備えた車両では
その余剰空気を利用することもできる。
As can be seen from FIGS. 2 to 4, by installing the supercharging device according to the present invention, the low-speed torque of the engine is significantly increased, and the acceleration performance of the vehicle is improved. Furthermore, since supercharging is performed from a low engine speed, the displacement and exhaust energy are large even at one low engine speed, and sufficient output from the exhaust turbine can be obtained. This has been shown to result in a shorter pressurized air injection time. The air compressor that supplies pressurized air to the pressurized air tank 24 may utilize surplus energy while the vehicle is running. For example, the compressor may be driven intensively when the brake (engine brake) is used, or a generator may be attached to the turbocharger and the excess output of the exhaust turbine may be used to drive the compressor. Vehicles equipped with air vents can also utilize the excess air.

上記実施例では本発明による過給装置をディーゼルエン
ジン車に適用したものを例示したか、本発明はディーゼ
ルエンジン車に限らずガソリンエンジン車に適用しても
同様の効果か得られる。
In the above embodiment, the supercharging device according to the present invention is applied to a diesel engine vehicle, but the present invention is not limited to a diesel engine vehicle, but can also be applied to a gasoline engine vehicle to obtain similar effects.

(発明の効果) 以上説明したように、本発明おいては、排気タービンに
よって駆動される吸気過給コンプレッサと直列または並
列に、噴流ポンプと、該噴流ポンプの噴射ノズルから噴
射する加圧空気を供給する手段とを設けたので、エンジ
ンの運転状態がターボコンプレッサによっては必要な過
給圧が得られない範囲にあっても必要な過給圧が迅速に
得られ、過給装置のタイムラグによる出力増加の遅れを
補償して急激な出力増加を得ることができるとともに過
給装置のタイムラグを極めて小さくすることができる。
(Effects of the Invention) As explained above, in the present invention, a jet pump and pressurized air injected from an injection nozzle of the jet pump are connected in series or parallel to an intake supercharging compressor driven by an exhaust turbine. Since the system is equipped with a supply means, the necessary boost pressure can be quickly obtained even if the engine operating condition is in a range where the necessary boost pressure cannot be obtained by the turbo compressor, and the output due to the time lag of the supercharging device can be obtained. A rapid increase in output can be obtained by compensating for the delay in increase, and the time lag of the supercharger can be made extremely small.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明による車両用エンジン過給装置の一実施
例、第2図は本発明によるエンジン過給装置を用いた場
合の過給圧を従来の場合と比較して示すグラフ、第3図
は本発明によるエンジン過給装置を用いた場合の加圧空
気噴射量の経時変化を示すグラフ、第4図は本発明によ
るエンジン過給装置を用いた場合のエンジン出力トルク
を従来の場合と比較して示すグラフ、第5図は本発明に
よるエンジン過給装置を用いた場合のエンジン回転数を
従来の場合と比較して示すグラフである。 l・・・シリンダ、2・・・ピストン、3・・・排気バ
ルブ、4・・・内気バルク、5・・・ターボチャージャ
ー5a・・・排気タービン、5b・・・コンプレッサ、
6・・・燃料噴射ノズル、7・・・燃料パイプ、8.9
−・・吸気管、10・・・バイパス管、11−・・リー
トバルブ、11 a−−−支点、12.13,14.2
1−・・連絡管、15,16.22・・・圧力センサ、
17・・・熱交換器、17a・・・熱交換パイプ、18
・・・排気管、19・・・ノズル、20・・・加圧空気
管、23・・・制御弁、24・・・加圧空気留、25・
・・加圧空気バイブ、26・・・制御装置(コントロー
ラー)、27゜28.29,30.31・・・信号ケー
ブル、32・・・制御比カケープル、
FIG. 1 is an embodiment of a vehicle engine supercharging device according to the present invention, FIG. 2 is a graph showing supercharging pressure when using the engine supercharging device according to the present invention in comparison with a conventional case, and FIG. The figure is a graph showing the change in pressurized air injection amount over time when using the engine supercharging device according to the present invention, and Figure 4 shows the engine output torque when using the engine supercharging device according to the present invention compared to the conventional case. FIG. 5 is a graph showing the engine speed when using the engine supercharging device according to the present invention in comparison with the conventional case. l... Cylinder, 2... Piston, 3... Exhaust valve, 4... Internal air bulk, 5... Turbocharger 5a... Exhaust turbine, 5b... Compressor,
6... Fuel injection nozzle, 7... Fuel pipe, 8.9
--Intake pipe, 10...Bypass pipe, 11--Leet valve, 11 a---Fulcrum, 12.13, 14.2
1-...Connection pipe, 15, 16.22...Pressure sensor,
17... Heat exchanger, 17a... Heat exchange pipe, 18
... Exhaust pipe, 19... Nozzle, 20... Pressurized air pipe, 23... Control valve, 24... Pressurized air reservoir, 25...
... Pressurized air vibe, 26... Control device (controller), 27°28.29, 30.31... Signal cable, 32... Control ratio cable,

Claims (1)

【特許請求の範囲】[Claims] 排気タービンによって駆動される吸気過給コンプレッサ
と並列または直列に、噴流ポンプと、該噴流ポンプの噴
射ノズルから噴射する加圧空気を供給する手段とを設け
たことを特徴とする車両エンジンの過給装置。
Supercharging of a vehicle engine, characterized in that a jet pump and means for supplying pressurized air injected from an injection nozzle of the jet pump are provided in parallel or in series with an intake supercharging compressor driven by an exhaust turbine. Device.
JP62322759A 1987-12-22 1987-12-22 Supercharger for engine for vehicle Pending JPH0270921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62322759A JPH0270921A (en) 1987-12-22 1987-12-22 Supercharger for engine for vehicle

Applications Claiming Priority (1)

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JP62322759A JPH0270921A (en) 1987-12-22 1987-12-22 Supercharger for engine for vehicle

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JPH0270921A true JPH0270921A (en) 1990-03-09

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102359413A (en) * 2011-09-28 2012-02-22 奇瑞汽车股份有限公司 Turbocharging system
WO2013069675A1 (en) * 2011-11-07 2013-05-16 いすゞ自動車株式会社 Start acceleration assistance device
WO2013069674A1 (en) * 2011-11-07 2013-05-16 いすゞ自動車株式会社 Start acceleration assistance device
JP2015086810A (en) * 2013-10-31 2015-05-07 いすゞ自動車株式会社 Turbocharger auxiliary system of internal combustion engine and turbocharger auxiliary method of internal combustion engine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752633A (en) * 1980-09-17 1982-03-29 Hino Motors Ltd Supplementary acceleration system of internal combustion engine with exhaust gas turbine supercharger
JPS6114428A (en) * 1984-06-29 1986-01-22 Hino Motors Ltd Blowing controller for compressed air to internal-combustion engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752633A (en) * 1980-09-17 1982-03-29 Hino Motors Ltd Supplementary acceleration system of internal combustion engine with exhaust gas turbine supercharger
JPS6114428A (en) * 1984-06-29 1986-01-22 Hino Motors Ltd Blowing controller for compressed air to internal-combustion engine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102359413A (en) * 2011-09-28 2012-02-22 奇瑞汽车股份有限公司 Turbocharging system
WO2013069675A1 (en) * 2011-11-07 2013-05-16 いすゞ自動車株式会社 Start acceleration assistance device
WO2013069674A1 (en) * 2011-11-07 2013-05-16 いすゞ自動車株式会社 Start acceleration assistance device
JP2013096398A (en) * 2011-11-07 2013-05-20 Isuzu Motors Ltd Assist device for starting and acceleration
JP2013096397A (en) * 2011-11-07 2013-05-20 Isuzu Motors Ltd Start acceleration assistance device
JP2015086810A (en) * 2013-10-31 2015-05-07 いすゞ自動車株式会社 Turbocharger auxiliary system of internal combustion engine and turbocharger auxiliary method of internal combustion engine

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