JP2002147245A - Supercharging apparatus for engine of construction equipment - Google Patents
Supercharging apparatus for engine of construction equipmentInfo
- Publication number
- JP2002147245A JP2002147245A JP2000343399A JP2000343399A JP2002147245A JP 2002147245 A JP2002147245 A JP 2002147245A JP 2000343399 A JP2000343399 A JP 2000343399A JP 2000343399 A JP2000343399 A JP 2000343399A JP 2002147245 A JP2002147245 A JP 2002147245A
- Authority
- JP
- Japan
- Prior art keywords
- engine
- intercooler
- path
- present
- supercharger
- 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
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Supercharger (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、建設機械のエン
ジン過給装置の技術分野に属する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of an engine supercharger for a construction machine.
【０００２】[0002]
【従来の技術】建設機械搭載のエンジンにおいてもエン
ジンの効率を高めるために従来から過給器が利用されて
いる。過給器にはターボチャージャーとスーパーチャー
ジャ（機械式過給器ともいう）の２種類があり、前者は
排気ガスによってタービンを回転させてそれに直結した
圧縮機を回転させて吸入空気の圧力を高めることにより
吸入空気量を増加させる装置である。後者はエンジンの
出力の一部で、圧縮機を回転させて吸入空気の圧力を高
めることにより吸入空気量を増加させる装置である。前
者は排気ガスのエネルギーを利用するものであるから、
後者に比べてエンジンの効率はよくなる。2. Description of the Related Art Superchargers have conventionally been used in engines mounted on construction machines in order to increase the efficiency of the engine. There are two types of turbochargers: turbochargers and superchargers (also called mechanical superchargers). The former uses an exhaust gas to rotate a turbine and a compressor directly connected to it to increase the pressure of intake air. This is a device for increasing the amount of intake air. The latter is a device that increases the amount of intake air by rotating the compressor and increasing the pressure of the intake air with a part of the output of the engine. The former uses the energy of exhaust gas,
The efficiency of the engine is better than the latter.
【０００３】しかし、エンジンの排気ガスによってター
ビンを回し、タービンに連結された圧縮機によって過給
しているので、エンジンの無負荷最高回転状態（作業機
の低負荷状態）から高出力回転状態（作業機の高負荷状
態）に移行するときに空気供給量の増加に対するタイム
ラグ（いわゆるターボラグ）が大きいという欠点があ
る。又、インタークーラ（吸気冷却装置）を搭載した場
合はインタークーラ内部の圧力損失が生じ、さらに過給
遅れが発生してしまう。このために、過度的に空燃比が
小さくなりすぎて排気ガス中に不燃焼の燃料が多くな
り、スモーク及び燃料消費量の悪化を招く。同時にエン
ジンの回転数の低下する程度も増大するという課題があ
った。However, since the turbine is rotated by the exhaust gas of the engine and is supercharged by the compressor connected to the turbine, the engine rotates from the no-load maximum rotation state (low-load state of the working machine) to the high-output rotation state (low-load state). There is a disadvantage that a time lag (a so-called turbo lag) with respect to an increase in the air supply amount is large when shifting to a high load state of the working machine). Further, when an intercooler (intake cooling device) is mounted, a pressure loss occurs in the intercooler, and a supercharging delay occurs. For this reason, the air-fuel ratio becomes excessively small, and the amount of unburned fuel in the exhaust gas increases, resulting in smoke and deterioration of fuel consumption. At the same time, there is a problem that the degree of decrease in the engine speed increases.
【０００４】[0004]
【発明が解決しようとする課題】この発明は、上述のよ
うな背景の下になされたもので、建設機械に搭載したタ
ーボ過給器を利用したエンジンにおいてインタークーラ
による過給遅れ（タイムラグ）の弊害、即ちスモーク及
び燃料消費量の悪化を解決したエンジン過給装置を提供
することを目的としている。SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and has been developed in an engine utilizing a turbocharger mounted on a construction machine to reduce a supercharging delay (time lag) caused by an intercooler. It is an object of the present invention to provide an engine supercharging device which solves the adverse effects, that is, smoke and deterioration of fuel consumption.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に本発明は以下の手段を採用している。即ち、請求項１
記載の発明は、エンジンの吸気経路上に設けた過給器と
同経路上に設けたインタークーラを備えたエンジン過給
装置において、該過給器の下流経路に前記インタークー
ラを通過しないバイパス経路を設けたことを特徴として
いる。The present invention employs the following means to solve the above-mentioned problems. That is, claim 1
The present invention relates to an engine supercharger including a supercharger provided on an intake path of an engine and an intercooler provided on the same path, wherein a bypass path not passing through the intercooler is provided in a downstream path of the supercharger. It is characterized by having provided.
【０００６】請求項２記載の発明は、請求項１記載のエ
ンジン過給装置において、前記バイパス経路の入口、出
口または該経路上に前記過給器の過給圧が所定圧以上に
なったときに開通する切換弁を設けたことを特徴として
いる。According to a second aspect of the present invention, in the engine supercharging device according to the first aspect, when the supercharging pressure of the supercharger at the inlet, outlet, or on the bypass path becomes equal to or higher than a predetermined pressure. And a switching valve that opens to the vehicle.
【０００７】請求項３記載の発明は、請求項２記載のエ
ンジン過給装置において、前記切換弁は急負荷時の短い
時間だけ開通するように設定したことを特徴としてい
る。According to a third aspect of the present invention, in the engine supercharging device according to the second aspect, the switching valve is set so as to be opened only for a short time during a sudden load.
【０００８】[0008]
【発明の実施形態】図１は本発明を実施した実施形態の
構成を示すブロック図である。以下、図面を参照してこ
の発明の実施形態について説明する。図１において、エ
ンジン１０の排気側経路１１にはターボ過給器１２が設
けられ、マフラ１３を通って大気中に排出される。ター
ボ過給器１２は排気ガスによって回転させるタービン１
２ａとタービン１２ａの出力軸に連結された圧縮器（過
給器）１２ｂから構成されている。一方、吸気側には吸
入空気をエンジン１０内にガイドするマニホールド１４
が設けられている。マニホールド１４にはエアクリーナ
１６、圧縮機１２ｂ、切換弁１７並びにインタークーラ
１８が順に配設された吸気経路１５とインタークーラ１
８をショートカットしてマニホールド１４に吸気するバ
イパス経路１９が接続されている。FIG. 1 is a block diagram showing a configuration of an embodiment in which the present invention is implemented. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, a turbocharger 12 is provided in an exhaust-side path 11 of an engine 10, and is discharged to the atmosphere through a muffler 13. The turbocharger 12 is a turbine 1 rotated by exhaust gas.
2a and a compressor (supercharger) 12b connected to the output shaft of the turbine 12a. On the other hand, a manifold 14 for guiding the intake air into the engine 10 is provided on the intake side.
Is provided. The manifold 14 has an intake passage 15 in which an air cleaner 16, a compressor 12 b, a switching valve 17 and an intercooler 18 are sequentially arranged, and an intercooler 1.
A bypass path 19 for connecting the manifold 8 to the manifold 14 by short-cutting the intake path 8 is connected.
【０００９】図２に切換弁１７の構成例を示す。図２
（Ａ）は吸気経路１５とバイパス経路１９の分岐点に切
換弁１７を設けた例である。切換弁１７は上流側の過給
圧Ｐが所定の圧力Ｐ１に達しないときはインタークーラ
と連通し、所定圧Ｐ１以上になったときに切り替わり、
バイパス経路に連通する。また、切換弁１７は連通後、
所定の短時間経過後に再度切換えてバイパス経路を閉鎖
するように構成してもよい。これは調節可能な遅れ要素
２０（図２（Ｃ）参照）を切換弁１７に付加することに
より可能である。バイパス経路が連通しているときはイ
ンタークーラ１８に吸気は流れない。図２（Ｂ）はバイ
パス経路１９上に切換弁１７を設けた例で、切換弁１７
は上流側の過給圧Ｐが所定の圧力Ｐ１に達しないときは
インタークーラと連通し、所定圧Ｐ１以上になったとき
に切り替わり、インタークーラ１８に連通すると共にバ
イパス経路１９も連通する。しかし、インタークーラ１
８は空気の流れ抵抗が大きいので、吸気の殆どがバイパ
ス経路を通って、吸気側マニホールド１４に流れる。従
って、図２（Ａ）の切換弁１７も図２（Ｂ）の切換弁１
７も作用、効果は殆ど等しい。同様に、切換弁１７はバ
イパス経路の合流点に設けてもよい。FIG. 2 shows a configuration example of the switching valve 17. FIG.
(A) is an example in which a switching valve 17 is provided at a branch point between the intake path 15 and the bypass path 19. The switching valve 17 communicates with the intercooler when the upstream supercharging pressure P does not reach the predetermined pressure P1, and switches when the supercharging pressure P exceeds the predetermined pressure P1,
Communicate with the bypass route. Also, after the switching valve 17 is connected,
The bypass path may be closed by switching again after a lapse of a predetermined short time. This is possible by adding an adjustable delay element 20 (see FIG. 2C) to the switching valve 17. When the bypass path is in communication, intake air does not flow to the intercooler 18. FIG. 2B shows an example in which the switching valve 17 is provided on the bypass path 19.
Is connected to the intercooler when the upstream supercharging pressure P does not reach the predetermined pressure P1, and is switched when the supercharging pressure P becomes equal to or higher than the predetermined pressure P1. However, intercooler 1
8 has a large air flow resistance, so that most of the intake air flows into the intake side manifold 14 through the bypass path. Therefore, the switching valve 17 shown in FIG.
7 also works and has almost the same effect. Similarly, the switching valve 17 may be provided at the junction of the bypass path.
【００１０】図３は本実施形態の過渡応答（Ｂ）とバイ
パス経路１９を設けない従来装置（図５参照）の過渡応
答（Ａ）との比較を示す。これらは低負荷状態から高負
荷状態に急激に変化させた場合の応答を示す。低負荷状
態では排気流量が少ないため過給圧は低く、高負荷にな
るにつれて排気流量と共に過給圧も上昇する。従来装置
ではピークを持つ１次系の応答をする。しかし、本実施
形態では過給圧がＰ１に達するとバイパス経路が連通す
るので過給圧は圧力Ｐ１で頭打ちになる。また、空気の
吸気流量は従来装置では大きなタイムラグ（過給遅れ）
ＤＬを伴う。これはインタークーラ１８を通過する時間
に略等しい。一方、本実施形態の場合のタイムラグは切
換弁１７の切換時間Ｄｔに略等しい。切換時間Ｄｔはイ
ンタークーラ１８を通過する時間に比べて著しく小さい
ので、本実施形態による場合の過給のタイムラグは非常
に小さいものとなる。FIG. 3 shows a comparison between the transient response (B) of the present embodiment and the transient response (A) of the conventional device without the bypass path 19 (see FIG. 5). These show responses when the load is suddenly changed from the low load state to the high load state. In a low load state, the supercharging pressure is low because the exhaust flow rate is small, and the supercharging pressure increases with the exhaust flow rate as the load increases. In the conventional apparatus, a response of a primary system having a peak is made. However, in this embodiment, when the supercharging pressure reaches P1, the bypass path is connected, and the supercharging pressure reaches a plateau at the pressure P1. In addition, the air intake flow rate is a large time lag in conventional equipment (supercharging delay).
With DL. This is approximately equal to the time of passing through the intercooler 18. On the other hand, the time lag in the case of the present embodiment is substantially equal to the switching time Dt of the switching valve 17. Since the switching time Dt is significantly shorter than the time for passing through the intercooler 18, the time lag of supercharging in the case of the present embodiment is very small.
【００１１】図４は油圧ポンプの吐出圧力とエンジン回
転数について本実施形態の過渡応答（Ｂ）とバイパス経
路１９を設けない従来装置（図５参照）の過渡応答
（Ａ）との比較を示す。図４に示されているように、油
圧ポンプ側から同一の負荷が加わったときのエンジン回
転数の整定時間及び最大変動振幅は本実施形態の場合が
従来装置に比べて相当に小さくなることが理解される。FIG. 4 shows a comparison between the transient response (B) of the present embodiment and the transient response (A) of the conventional device without the bypass path 19 (see FIG. 5) with respect to the discharge pressure of the hydraulic pump and the engine speed. . As shown in FIG. 4, the settling time and the maximum fluctuation amplitude of the engine speed when the same load is applied from the hydraulic pump side can be considerably smaller in the case of the present embodiment than in the conventional device. Understood.
【００１２】以上に説明したように、本実施形態によれ
ば、空気の吸気流量の遅れ及びエンジンの回転数の整定
時間が従来装置に比べて著しく小さくなり、その結果、
排気ガス中のスモーク量を抑えることができ、又同時に
燃料消費量の低減を図ることが可能となる。As described above, according to the present embodiment, the delay of the air intake flow rate and the settling time of the engine speed are significantly reduced as compared with the conventional apparatus.
The amount of smoke in the exhaust gas can be suppressed, and the fuel consumption can be reduced at the same time.
【００１３】以上、この発明の実施形態、実施例を図面
により詳述してきたが、具体的な構成はこの実施例に限
られるものではなく、この発明の要旨を逸脱しない範囲
の設計の変更等があってもこの発明に含まれる。Although the embodiments and examples of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the examples, and changes in the design and the like may be made without departing from the gist of the present invention. Even if there is, it is included in the present invention.
【００１４】[0014]
【発明の効果】以上説明したように、この発明の構成に
よれば、過給器による吸気流量の遅れ及びエンジンの回
転数の整定時間を小さくすることが可能となり、その結
果、排気ガス中のスモーク量を抑えることができ、又同
時に燃料消費量の低減を図ることが可能となるという効
果が得られる。As described above, according to the structure of the present invention, it is possible to reduce the delay of the intake air flow rate by the supercharger and the settling time of the engine speed. The effect that the amount of smoke can be suppressed and the fuel consumption can be reduced at the same time is obtained.
【図１】 本発明を実施した実施形態のブロック図を示
す。FIG. 1 shows a block diagram of an embodiment implementing the present invention.
【図２】 本実施形態における切換弁の構成例を示す。FIG. 2 shows a configuration example of a switching valve in the present embodiment.
【図３】 本実施形態の装置（Ｂ）と従来装置（Ａ）と
の応答の比較を示す。FIG. 3 shows a comparison of the response between the device (B) of the present embodiment and the conventional device (A).
【図４】 本実施形態の装置（Ｂ）と従来装置（Ａ）と
の応答の比較を示す。FIG. 4 shows a comparison of the response between the device (B) of the present embodiment and the conventional device (A).
【図５】 従来装置を示す。FIG. 5 shows a conventional device.
１０ エンジン １１ 排気経路 １２ ターボ過給器 １４ 吸気マニホールド １５ 吸気経路 １７ 切換弁 １８ インタークーラ DESCRIPTION OF SYMBOLS 10 Engine 11 Exhaust path 12 Turbocharger 14 Intake manifold 15 Intake path 17 Switching valve 18 Intercooler
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｆ０２Ｄ 23/00 Ｆ０２Ｂ 37/00 ３０３Ｚ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) F02D 23/00 F02B 37/00 303Z
Claims (3)
同経路上に設けたインタークーラを備えたエンジン過給
装置において、該過給器の下流経路に前記インタークー
ラを通過しないバイパス経路を設けたことを特徴とする
建設機械のエンジン過給装置。1. An engine supercharger comprising a supercharger provided on an intake path of an engine and an intercooler provided on the same path, wherein a bypass path not passing through the intercooler is provided in a downstream path of the supercharger. An engine supercharging device for a construction machine, comprising:
て、前記バイパス経路の入口、出口または該経路上に前
記過給器の過給圧が所定圧以上になったときに開通する
切換弁を設けたことを特徴とする建設機械のエンジン過
給装置。2. The engine supercharging device according to claim 1, further comprising: a switching valve that opens when the supercharging pressure of the supercharger becomes equal to or higher than a predetermined pressure, at an inlet, an outlet, or on the bypass path. An engine supercharging device for a construction machine, comprising:
て、前記切換弁は急負荷時の短い時間だけ開通するよう
に設定したことを特徴とする建設機械のエンジン過給装
置。3. The engine supercharging device according to claim 2, wherein the switching valve is set to be opened only for a short time during a sudden load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000343399A JP2002147245A (en) | 2000-11-10 | 2000-11-10 | Supercharging apparatus for engine of construction equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000343399A JP2002147245A (en) | 2000-11-10 | 2000-11-10 | Supercharging apparatus for engine of construction equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002147245A true JP2002147245A (en) | 2002-05-22 |
Family
ID=18817773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000343399A Pending JP2002147245A (en) | 2000-11-10 | 2000-11-10 | Supercharging apparatus for engine of construction equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002147245A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006004739A1 (en) * | 2006-02-02 | 2007-08-09 | Volkswagen Ag | Operating method for internal combustion engine of motor vehicle, involves determining difference between target load pressure essential for load requirement and actual load pressure |
-
2000
- 2000-11-10 JP JP2000343399A patent/JP2002147245A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006004739A1 (en) * | 2006-02-02 | 2007-08-09 | Volkswagen Ag | Operating method for internal combustion engine of motor vehicle, involves determining difference between target load pressure essential for load requirement and actual load pressure |
| DE102006004739B4 (en) * | 2006-02-02 | 2016-08-18 | Volkswagen Ag | Method for operating an internal combustion engine |
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