JP5253074B2 - Fuel supply system for fuel injection system - Google Patents

Fuel supply system for fuel injection system Download PDF

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JP5253074B2
JP5253074B2 JP2008260482A JP2008260482A JP5253074B2 JP 5253074 B2 JP5253074 B2 JP 5253074B2 JP 2008260482 A JP2008260482 A JP 2008260482A JP 2008260482 A JP2008260482 A JP 2008260482A JP 5253074 B2 JP5253074 B2 JP 5253074B2
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pressure
fuel injection
temperature
cooling device
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康久 菅原
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Hino Motors Ltd
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Description

本発明は、燃料噴射圧の高圧化に伴って温度が上昇する燃料噴射系統内の燃料の温度を一定値以下に保持するための燃料噴射系統の燃料供給装置に関する。   The present invention relates to a fuel supply system for a fuel injection system for maintaining the temperature of fuel in a fuel injection system whose temperature rises with an increase in fuel injection pressure below a certain value.

近年、コモンレールとインジェクタを有する燃料噴射装置（蓄圧式燃料噴射装置）を採用したディーゼルエンジン等の内燃機関の燃料噴射系統においては、エンジン気筒での燃焼用空気との混合性を高めるために、燃料供給装置から蓄圧式燃料噴射装置に供給する燃料の高圧化が図られ、これによって燃料の温度上昇が著しくなっており、この燃料の温度上昇によりインジェクタ及び噴射ポンプ内の摺動部品等が熱的に厳しくなる場合が生じている。   2. Description of the Related Art In recent years, in a fuel injection system of an internal combustion engine such as a diesel engine that employs a fuel injection device (accumulation type fuel injection device) having a common rail and an injector, in order to improve the miscibility with combustion air in the engine cylinder, The pressure of the fuel supplied from the supply device to the pressure accumulating fuel injection device is increased, and the temperature of the fuel increases significantly, and the temperature of the fuel increases the temperature of the injector and the sliding parts in the injection pump. There are cases where it becomes severe.

又、近年では、前記エンジンの燃料にバイオ燃料を用いることが行われており、このようなエンジンにおいては燃料噴射系統内の温度をバイオ燃料の変質温度以下に抑える必要がある。   In recent years, biofuel has been used as the fuel for the engine. In such an engine, it is necessary to keep the temperature in the fuel injection system below the altered temperature of the biofuel.

このような問題に対処するために従来の燃料噴射系統では、燃料タンクへの燃料の戻り流路に燃料クーラを設置して燃料温度の上昇を抑制することが行われていた。   In order to cope with such a problem, in a conventional fuel injection system, a fuel cooler is installed in a fuel return path to a fuel tank to suppress an increase in fuel temperature.

図２は従来における蓄圧式燃料噴射装置と燃料供給装置とからなる燃料噴射系統の一例を示すもので、燃料タンク１の燃料は燃料供給流路２を介して燃料供給装置３を構成するフィードポンプ４により吸い上げられ、高圧ポンプ５で昇圧された後、蓄圧式燃料噴射装置６を構成するコモンレール７に供給された後、インジェクタ８から噴射されるようになっている。前記コモンレール７及びインジェクタ８での余剰の燃料は戻り流路９により前記燃料タンク１に戻すようにしている。又、前記高圧ポンプ５に設けた調圧弁１０からの余剰燃料は返送流路１１によりスルーフィードバルブ１２を介して前記戻し流路９からの燃料と合流して合流管１３により燃料タンク１に戻すようにしている。尚、前記燃料供給装置３を構成する前記フィードポンプ４と高圧ポンプ５は独立して配置した場合を示しているが、フィードポンプ４と高圧ポンプ５は一体に組み立てられたものが多く用いられている。   FIG. 2 shows an example of a conventional fuel injection system composed of an accumulator fuel injection device and a fuel supply device. The fuel in the fuel tank 1 is a feed pump that constitutes the fuel supply device 3 via the fuel supply passage 2. After being sucked up by 4 and boosted by the high-pressure pump 5, it is supplied to the common rail 7 constituting the accumulator fuel injection device 6 and then injected from the injector 8. Excess fuel in the common rail 7 and the injector 8 is returned to the fuel tank 1 by a return passage 9. Further, surplus fuel from the pressure regulating valve 10 provided in the high pressure pump 5 joins the fuel from the return passage 9 through the return feed passage 11 via the through feed valve 12 and returns to the fuel tank 1 through the junction pipe 13. I am doing so. Although the feed pump 4 and the high-pressure pump 5 constituting the fuel supply device 3 are arranged separately, the feed pump 4 and the high-pressure pump 5 are often assembled integrally. Yes.

そして、図２の場合においては、前記合流管１３に燃料冷却装置１４を設置して燃料タンク１に戻る燃料の冷却を行うようにしている。   In the case of FIG. 2, a fuel cooling device 14 is installed in the junction pipe 13 to cool the fuel returning to the fuel tank 1.

上記燃料噴射系統では、燃料タンク１の燃料は燃料供給流路２を介してフィードポンプ４により吸い上げられて高圧ポンプ５で昇圧された後、蓄圧式燃料噴射装置６のコモンレール７に供給されてインジェクタ８からエンジンの気筒に噴射される。コモンレール７及びインジェクタ８の余剰の燃料は戻り流路９によって前記燃料タンク１に戻される。又、前記高圧ポンプ５に設けた調圧弁１０からの余剰燃料も返送流路１１により前記戻り流路９の燃料と合流して合流管１３により燃料タンク１に戻される。   In the fuel injection system, the fuel in the fuel tank 1 is sucked up by the feed pump 4 through the fuel supply passage 2 and boosted by the high-pressure pump 5, and then supplied to the common rail 7 of the accumulator fuel injection device 6. 8 is injected into the cylinder of the engine. Excess fuel in the common rail 7 and the injector 8 is returned to the fuel tank 1 by a return passage 9. Further, surplus fuel from the pressure regulating valve 10 provided in the high-pressure pump 5 also joins the fuel in the return flow path 9 through the return flow path 11 and is returned to the fuel tank 1 through the merge pipe 13.

この時、前記合流管１３には燃料冷却装置１４を設置しているので、燃料タンク１に戻される燃料の温度は燃料冷却装置１４によって所定の温度に冷却することができる。   At this time, since the fuel cooling device 14 is installed in the junction pipe 13, the temperature of the fuel returned to the fuel tank 1 can be cooled to a predetermined temperature by the fuel cooling device 14.

従来において、噴射弁の後方の戻し管路に冷却装置を設けると共に、高圧制御弁の後方の戻し管路に冷却装置を設けた構成について技術開示した先行技術情報としては特許文献１がある。
特表２００１−５１６８４３号公報 Conventionally, there is Patent Document 1 as prior art information that technically discloses a configuration in which a cooling device is provided in the return line behind the injection valve and a cooling device is provided in the return line behind the high-pressure control valve.
JP 2001-516843 A

しかしながら、前記図２に示した従来の燃料噴射系統の燃料供給装置においては、前記コモンレール７及びインジェクタ８からの戻りの燃料と高圧ポンプ５に設けた調圧弁１０からの余剰の燃料とを燃料タンク１に戻す合流管１３に燃料冷却装置１４を設置して、昇温した燃料を冷却するようにしているため、燃料噴射系統のいずれかの場所には燃料冷却装置１４の出口温度よりも温度が高い部分が存在することになるが、燃料噴射系統での燃料の温度を評価することが難しいという問題を有していた。   However, in the conventional fuel supply system of the fuel injection system shown in FIG. 2, the fuel returned from the common rail 7 and the injector 8 and the surplus fuel from the pressure regulating valve 10 provided in the high-pressure pump 5 are supplied to the fuel tank. Since the fuel cooling device 14 is installed in the merging pipe 13 that returns to 1 so as to cool the heated fuel, the temperature is higher than the outlet temperature of the fuel cooling device 14 at any location in the fuel injection system. Although there is a high portion, there is a problem that it is difficult to evaluate the temperature of the fuel in the fuel injection system.

又、コモンレール７及びインジェクタ８からの戻りの燃料と高圧ポンプ５に設けた調圧弁１０からの余剰の燃料とは合流管１３で合流することで全体の温度が平坦化して低下することになるため、燃料冷却装置１４による冷却効果は低くなり、よって燃料冷却装置１４が大型化するという問題がある。更に、この時、前記コモンレール７及びインジェクタ８を備えるエンジンと、燃料タンク１との間には大きな距離を有する場合が多い（例えばバスの場合には１０メートルにも及ぶ場合がある。）ため、合流管１３によって燃料タンク１へ導かれる燃料は放熱により更に温度が低下するようになる。   Moreover, since the return fuel from the common rail 7 and the injector 8 and the surplus fuel from the pressure regulating valve 10 provided in the high-pressure pump 5 are joined by the junction pipe 13, the overall temperature is flattened and lowered. The cooling effect of the fuel cooling device 14 is reduced, and the fuel cooling device 14 is increased in size. Further, at this time, there is often a large distance between the engine including the common rail 7 and the injector 8 and the fuel tank 1 (for example, in the case of a bus, it may be as long as 10 meters). The temperature of the fuel guided to the fuel tank 1 by the junction pipe 13 is further lowered due to heat radiation.

このため、燃料冷却装置１４をインジェクタ８出口に設けることも考えられるが、この場合には部品が密集するシリンダヘッド内への設置となるために、配置が困難となりレイアウト性が悪いという問題を有していた。   For this reason, it is conceivable to provide the fuel cooling device 14 at the outlet of the injector 8. However, in this case, since it is installed in the cylinder head where the parts are densely packed, there is a problem that the layout is difficult and the layout property is poor. Was.

又、戻りの燃料の温度を燃料冷却装置１４によって低下しても、前記したように燃料噴射系統には部分的に温度が高い部分が生じる問題があるため、エンジンの燃料にバイオ燃料を用いたような場合においては、例えばインジェクタの温度が所定温度よりも上昇し、これによってバイオ燃料の変質が発生するという問題を有していた。   Further, even if the temperature of the return fuel is lowered by the fuel cooling device 14, there is a problem that a part of the fuel injection system has a high temperature as described above, so that biofuel is used as fuel for the engine. In such a case, for example, there has been a problem that the temperature of the injector rises above a predetermined temperature, thereby causing the biofuel to be altered.

本発明は、上記実情に鑑みてなしたもので、蓄圧式燃料噴射装置に供給する燃料を効果的に冷却して燃料の温度を一定温度以下に確実に押えることができ、且つ冷却のための駆動動力も低減できるようにした燃料噴射系統の燃料供給装置を提供しようとするものである。   The present invention has been made in view of the above circumstances, and can effectively cool the fuel supplied to the accumulator fuel injection device to reliably keep the temperature of the fuel below a certain temperature, and for cooling. It is an object of the present invention to provide a fuel supply system for a fuel injection system that can reduce drive power.

本発明は、フィードポンプと高圧ポンプを備えた燃料供給装置によりコモンレールとインジェクタを有する蓄圧式燃料噴射装置に燃料を供給するようにしている燃料噴射系統の燃料供給装置であって、前記フィードポンプとコモンレールとの間に複数の高圧ポンプを備え、各高圧ポンプの前後に位置するように配置した燃料冷却装置を介して各高圧ポンプを直列に接続し、各高圧ポンプの入側で燃料冷却装置により燃料を冷却して容積を減少させてから加圧することを繰り返し且つ最終段の燃料冷却装置で冷却してからコモンレールに供給するようにしたことを特徴とする。 The present invention is a fuel supply system for a fuel injection system in which fuel is supplied to a pressure accumulating fuel injection apparatus having a common rail and an injector by a fuel supply apparatus including a feed pump and a high-pressure pump, the fuel supply system comprising: A plurality of high-pressure pumps are connected to the common rail, and each high-pressure pump is connected in series via a fuel cooling device arranged so as to be positioned before and after each high-pressure pump. The fuel is cooled and the volume is reduced, and then pressurization is repeated, and the fuel is cooled by the fuel cooling device at the final stage and then supplied to the common rail .

而して、上記手段によれば、フィードポンプとコモンレールとの間に備えた複数の高圧ポンプが、各高圧ポンプの前後に位置するように配置した燃料冷却装置を介して直列に接続されているので、各高圧ポンプの入側の燃料冷却装置で冷却されて容積が減少した燃料が各高圧ポンプへ供給されて加圧されるようになる。   Thus, according to the above means, the plurality of high-pressure pumps provided between the feed pump and the common rail are connected in series via the fuel cooling device disposed so as to be positioned before and after each high-pressure pump. Therefore, the fuel that has been cooled by the fuel cooling device on the inlet side of each high-pressure pump and whose volume has been reduced is supplied to each high-pressure pump and pressurized.

本発明によれば、フィードポンプとコモンレールとの間に、複数の高圧ポンプの前後に位置するように燃料冷却装置を配置して各高圧ポンプを直列に接続したので、各高圧ポンプの入側の燃料冷却装置で冷却されて容積が減少した燃料が各高圧ポンプへ供給されて加圧されるため、各高圧ポンプにおいて効果的な加圧が行われるようになり、よって高い圧力に保持しても、各高圧ポンプを小型化できると共に、燃料の温度を一定温度以下に確実に冷却して蓄圧式燃料噴射装置に供給することができ、しかも各高圧ポンプの駆動動力を低減できるという優れた効果を奏し得る。   According to the present invention, the fuel cooling device is arranged between the feed pump and the common rail so as to be positioned before and after the plurality of high-pressure pumps, and the high-pressure pumps are connected in series. Since the fuel cooled by the fuel cooling device and reduced in volume is supplied to each high pressure pump and pressurized, effective pressurization is performed in each high pressure pump. In addition to reducing the size of each high-pressure pump, the fuel temperature can be reliably cooled below a certain temperature and supplied to the accumulator fuel injection device, and the driving power of each high-pressure pump can be reduced. Can play.

更に、蓄圧式燃料噴射装置に供給する燃料の温度を確実に低減できるため、バイオ燃料を用いる場合においても、バイオ燃料が変質する問題を防止できる効果がある。   Furthermore, since the temperature of the fuel supplied to the pressure accumulating fuel injection device can be reliably reduced, even when biofuel is used, there is an effect of preventing a problem that the biofuel is altered.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は本発明を実施する形態の一例を示すもので、図１中、図２と同一のものには同一の符号を付して説明を省略し、本発明の特徴部分についてのみ以下で詳述する。   FIG. 1 shows an example of an embodiment of the present invention. In FIG. 1, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Only the features of the present invention are described in detail below. Describe.

図１に示す如く、燃料タンク１の燃料が燃料供給流路２によりフィードポンプ４と高圧ポンプ５を備えた燃料供給装置３に供給され、続いて、コモンレール７及びインジェクタ８を有する蓄圧式燃料噴射装置６に供給されるようにした燃料噴射系統において、フィードポンプ４とコモンレール７との間に、複数の高圧ポンプ５ａ，５ｂ，５ｃを設け、且つ各高圧ポンプ５ａ，５ｂ，５ｃの前後に位置するように燃料冷却装置１５（図１では１５ａ，１５ｂ，１５ｃ，１５ｄ）を配置し、１〜３段の燃料冷却装置１５ａ，１５ｂ，１５ｃからの燃料は高圧ポンプ５ａ，５ｂ，５ｃの調圧弁５ａ’，５ｂ’，５ｃ’に供給するようにして各燃料冷却装置１５ａ，１５ｂ，１５ｃ，１５ｄと各高圧ポンプ５ａ，５ｂ，５ｃとを直列に接続し、最終段の高圧ポンプ５ｃで加圧した燃料は最終段の燃料冷却装置１５ｄで冷却した後前記コモンレール７に供給するようにしている。尚、図１では３つの高圧ポンプ５ａ，５ｂ，５ｃを備え、且つ各高圧ポンプ５ａ，５ｂ，５ｃの前後に位置するように４つの燃料冷却装置１５ａ，１５ｂ，１５ｃ，１５ｄを配置した例を示したが、２つの高圧ポンプ５ａ，５ｂと３つの燃料冷却装置１５ａ，１５ｂ，１５ｃを直列に接続配置するようにしてもよく、又、図１の３つの高圧ポンプ５ａ，５ｂ，５ｃと４つの燃料冷却装置１５ａ，１５ｂ，１５ｃ，１５ｄよりも多い数の高圧ポンプと燃料冷却装置を組み合わせて直列に接続配置してもよい。   As shown in FIG. 1, the fuel in the fuel tank 1 is supplied to a fuel supply device 3 having a feed pump 4 and a high-pressure pump 5 through a fuel supply flow path 2, followed by a pressure accumulation fuel injection having a common rail 7 and an injector 8. In the fuel injection system supplied to the apparatus 6, a plurality of high-pressure pumps 5a, 5b, 5c are provided between the feed pump 4 and the common rail 7, and are positioned before and after each of the high-pressure pumps 5a, 5b, 5c. The fuel cooling device 15 (15a, 15b, 15c, 15d in FIG. 1) is arranged so that the fuel from the first to third fuel cooling devices 15a, 15b, 15c is a pressure regulating valve of the high pressure pumps 5a, 5b, 5c. The fuel cooling devices 15a, 15b, 15c, 15d and the high-pressure pumps 5a, 5b, 5c are connected in series so as to be supplied to 5a ′, 5b ′, 5c ′, and the final stage The fuel pressurized by the high pressure pump 5c are to be supplied to the common rail 7 After cooling in the fuel cooling device 15d of the final stage. In FIG. 1, an example in which three high-pressure pumps 5a, 5b, 5c are provided and four fuel cooling devices 15a, 15b, 15c, 15d are arranged so as to be positioned before and after each of the high-pressure pumps 5a, 5b, 5c. As shown, the two high-pressure pumps 5a, 5b and the three fuel cooling devices 15a, 15b, 15c may be connected in series, and the three high-pressure pumps 5a, 5b, 5c, 4 in FIG. A higher number of high-pressure pumps and fuel cooling devices than the two fuel cooling devices 15a, 15b, 15c, and 15d may be combined and connected in series.

更に、最終段の高圧ポンプ５ｃの調圧弁５ｃ’からの余剰燃料は返送流路１１により前記コモンレール７及びインジェクタ８からの余剰の燃料と合流管１３で合流し、前記燃料タンク１に戻すようにしている。   Further, surplus fuel from the pressure regulating valve 5 c ′ of the high-pressure pump 5 c at the final stage is merged with surplus fuel from the common rail 7 and the injector 8 through the junction pipe 13 through the return flow path 11 and returned to the fuel tank 1. ing.

而して、上記図１の燃料噴射系統の燃料供給装置によれば、複数の高圧ポンプ５ａ，５ｂ，５ｃの前後に位置するように燃料冷却装置１５ａ，１５ｂ，１５ｃ，１５ｄを配置して各高圧ポンプ５ａ，５ｂ，５ｃを直列に接続したので、各高圧ポンプ５ａ，５ｂ，５ｃの入側の燃料冷却装置１５ａ，１５ｂ，１５ｃで冷却して容積を減少させた燃料が各高圧ポンプ５ａ，５ｂ，５ｃへ供給されて加圧されるため、各高圧ポンプ５ａ，５ｂ，５ｃでは効果的な加圧が行われるようになるため、高い圧力に維持保持しても、各高圧ポンプ５ａ，５ｂ，５ｃを小型化することができると共に、燃料の温度を一定温度以下に確実に冷却して蓄圧式燃料噴射装置６に供給することができ、しかも各高圧ポンプ５ａ，５ｂ，５ｃよる駆動動力を低減することができる。   Thus, according to the fuel supply system of the fuel injection system of FIG. 1, the fuel cooling devices 15a, 15b, 15c, and 15d are arranged so as to be positioned before and after the plurality of high-pressure pumps 5a, 5b, and 5c. Since the high-pressure pumps 5a, 5b, 5c are connected in series, the fuel cooled by the fuel cooling devices 15a, 15b, 15c on the inlet side of the high-pressure pumps 5a, 5b, 5c to reduce the volume is supplied to the high-pressure pumps 5a, 5b, 5c. Since the high pressure pumps 5a, 5b, and 5c are effectively pressurized by being supplied to the pressures 5b and 5c, the high pressure pumps 5a and 5b are maintained even at a high pressure. , 5c can be reduced in size, and the temperature of the fuel can be reliably cooled below a certain temperature and supplied to the accumulator fuel injection device 6, and the driving power from each of the high-pressure pumps 5a, 5b, 5c can be reduced. To reduce It can be.

更に、蓄圧式燃料噴射装置６に供給する燃料の温度を確実に低減できるため、バイオ燃料を用いる場合においても、バイオ燃料が変質する問題を防止することができる。   Furthermore, since the temperature of the fuel supplied to the pressure accumulating fuel injection device 6 can be reliably reduced, even when biofuel is used, it is possible to prevent the problem of deterioration of the biofuel.

なお、図１の燃料冷却装置１５には、空冷式、水冷式等の種々の冷却方式のものが採用できること、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   The fuel cooling device 15 shown in FIG. 1 can employ various cooling methods such as an air cooling method and a water cooling method, and can be variously modified without departing from the scope of the present invention. is there.

本発明を実施する形態の一例を示す概略側面図である。It is a schematic side view which shows an example of the form which implements this invention. 従来における蓄圧式燃料噴射装置と燃料供給装置とからなる燃料噴射系統の一例を示す概略側面図である。It is a schematic side view which shows an example of the fuel injection system which consists of a conventional pressure accumulation type fuel injection device and a fuel supply apparatus.

符号の説明Explanation of symbols

３ 燃料供給装置
４ フィードポンプ
５ 高圧ポンプ
５ａ，５ｂ，５ｃ 高圧ポンプ
６ 蓄圧式燃料噴射装置
７ コモンレール
８ インジェクタ
１５ （１５ａ，１５ｂ，１５ｃ，１５ｄ） 燃料冷却装置 DESCRIPTION OF SYMBOLS 3 Fuel supply apparatus 4 Feed pump 5 High pressure pump 5a, 5b, 5c High pressure pump 6 Accumulation type fuel injection apparatus 7 Common rail 8 Injector 15 (15a, 15b, 15c, 15d) Fuel cooling apparatus

Claims (1)

フィードポンプと高圧ポンプを備えた燃料供給装置によりコモンレールとインジェクタを有する蓄圧式燃料噴射装置に燃料を供給するようにしている燃料噴射系統の燃料供給装置であって、前記フィードポンプとコモンレールとの間に複数の高圧ポンプを備え、各高圧ポンプの前後に位置するように配置した燃料冷却装置を介して各高圧ポンプを直列に接続し、各高圧ポンプの入側で燃料冷却装置により燃料を冷却して容積を減少させてから加圧することを繰り返し且つ最終段の燃料冷却装置で冷却してからコモンレールに供給するようにしたことを特徴とする燃料噴射系統の燃料供給装置。 A fuel supply system for a fuel injection system configured to supply fuel to an accumulator fuel injection apparatus having a common rail and an injector by a fuel supply apparatus including a feed pump and a high-pressure pump. A plurality of high-pressure pumps are connected to each other in series via a fuel cooling device disposed so as to be positioned before and after each high-pressure pump, and the fuel is cooled by the fuel cooling device on the inlet side of each high-pressure pump. The fuel supply system of the fuel injection system is characterized in that the pressurization is repeated after the volume is reduced and the fuel is supplied to the common rail after being cooled by the fuel cooling device at the final stage .
JP2008260482A 2008-10-07 2008-10-07 Fuel supply system for fuel injection system Expired - Fee Related JP5253074B2 (en)

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JP2010138821A (en) * 2008-12-12 2010-06-24 Bosch Corp Accumulator fuel supply device and fuel supply pump
JP6387905B2 (en) * 2015-06-10 2018-09-12 株式会社デンソー Gasoline fuel supply system
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