JPH0712023A - Fuel supply device for diesel engine - Google Patents
Fuel supply device for diesel engineInfo
- Publication number
- JPH0712023A JPH0712023A JP18073893A JP18073893A JPH0712023A JP H0712023 A JPH0712023 A JP H0712023A JP 18073893 A JP18073893 A JP 18073893A JP 18073893 A JP18073893 A JP 18073893A JP H0712023 A JPH0712023 A JP H0712023A
- Authority
- JP
- Japan
- Prior art keywords
- fuel
- heating
- fuel supply
- diesel engine
- passage
- 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
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はディーゼルエンジンの燃
料供給装置に関し、寒冷時でも燃料噴射率の低下を防止
して、エンジン出力を高精度に安定化できるものを提供
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for a diesel engine, which can prevent a decrease in fuel injection rate even in cold weather and stabilize engine output with high accuracy.
【０００２】[0002]
【発明の背景】本発明の対象となるディーゼルエンジン
の燃料供給装置の基本構造は、図１又は図２に示すよう
に、ディーゼルエンジンＥに燃料タンク１及び燃料噴射
ポンプ２を設け、燃料タンク１を燃料供給路３を介して
燃料噴射ポンプ２に燃料供給可能に接続した形式のもの
である。BACKGROUND OF THE INVENTION The basic structure of a fuel supply system for a diesel engine, which is the subject of the present invention, is a diesel engine E provided with a fuel tank 1 and a fuel injection pump 2 as shown in FIG. 1 or 2. Is connected to the fuel injection pump 2 via the fuel supply path 3 so that fuel can be supplied.
【０００３】[0003]
【従来の技術】この形式の従来技術としては、図２に示
すように、ディーゼルエンジンＥの燃料供給路３にフィ
ードポンプ１１及び燃料フィルタ１２を介装し、燃料タ
ンク１内の燃料を燃料フィルタ１２で濾過し、フィード
ポンプ１１で圧送して燃料噴射ポンプ２に供給するよう
に構成したものが一般的である。2. Description of the Related Art As a conventional technique of this type, as shown in FIG. 2, a fuel pump 3 and a fuel filter 12 are provided in a fuel supply passage 3 of a diesel engine E so that the fuel in a fuel tank 1 is filtered by a fuel filter. It is general that the fuel is filtered by 12 and is pumped by the feed pump 11 to be supplied to the fuel injection pump 2.
【０００４】[0004]
【発明が解決しようとする課題】上記従来技術では、通
常、寒冷時には燃料の粘性が高くなるので、燃料噴射ポ
ンプ２の燃料吸入率が低下し、エンジンＥが出力不足に
なる虞れが大きい。本発明は、寒冷時でも燃料噴射ポン
プの吸入率の低下を防止して、エンジン出力を高く保持
することを技術的課題とする。In the above-mentioned prior art, since the viscosity of the fuel is usually high in cold weather, the fuel intake rate of the fuel injection pump 2 is reduced, and there is a high possibility that the output of the engine E will be insufficient. An object of the present invention is to prevent the intake rate of the fuel injection pump from decreasing even in cold weather and maintain a high engine output.
【０００５】[0005]
【課題を解決するための手段】上記課題を達成するため
の手段を、実施例を示す図１により以下に説明する。即
ち、本発明１は、前記基本構造のディーゼルエンジンの
燃料供給装置において、上記燃料供給路３に燃料加温手
段４を介装し、燃料加温手段４に加熱温度制御手段５を
連動し、加熱温度制御手段５で燃料加温手段４の加熱温
度を制御して、燃料供給路３内の燃料を所定温度域内に
保持するように構成したことを特徴とするものである。Means for achieving the above object will be described below with reference to FIG. 1 showing an embodiment. That is, the present invention 1 is the fuel supply device for a diesel engine having the above basic structure, in which the fuel heating means 4 is provided in the fuel supply passage 3, and the heating temperature control means 5 is interlocked with the fuel heating means 4. The heating temperature control means 5 controls the heating temperature of the fuel heating means 4 to keep the fuel in the fuel supply passage 3 within a predetermined temperature range.
【０００６】本発明２は、上記本発明１において、水冷
ディーゼルエンジンＥの水冷装置に冷却水路６を並列状
に接続し、この冷却水路６に加温水槽７と流量調節弁８
を介装し、加熱水槽７内に燃料供給路３を通して燃料供
給路３の燃料と加温水槽７の冷却水とを熱交換可能に構
成して、この加温水槽７で前記燃料加温手段４を構成
し、上記燃料供給路３と冷却水路６とのいずれかに温度
検出器１０を臨ませ、この温度検出器１０を流量制御装
置１７を介して上記流量調節弁８に制御操作可能に接続
したもので、前記加熱温度制御手段５を構成し、上記流
量制御装置１７は、温度検出器１０の検出温度に基づ
き、流量調節弁８を弁開閉操作または弁開量調節操作す
るように構成したことを特徴とするものである。A second aspect of the present invention is the same as the first aspect of the present invention, in which the cooling water passage 6 is connected in parallel to the water cooling device of the water-cooled diesel engine E, and the heating water tank 7 and the flow control valve 8 are connected to the cooling water passage 6.
The fuel in the fuel supply path 3 and the cooling water in the heating water tank 7 can exchange heat with each other through the fuel supply path 3 in the heating water tank 7. 4, the temperature detector 10 is exposed to either the fuel supply passage 3 or the cooling water passage 6, and the temperature detector 10 can be controlled by the flow control valve 8 via the flow control device 17. The heating temperature control means 5 is configured by the connection, and the flow rate control device 17 is configured to perform the valve opening / closing operation or the valve opening amount adjustment operation of the flow rate control valve 8 based on the temperature detected by the temperature detector 10. It is characterized by having done.
【０００７】[0007]
（1）本発明１では、燃料供給路３に燃料加温手段４を
介装するので、燃料供給路３内の燃料は、当該加温手段
４で所定温度域に加温される。このため、寒冷時でも燃
料の粘性を低く抑制して燃料噴射ポンプ２の吸入率が低
下することを円滑に防止できる。また、燃料は、加熱温
度制御手段５で温度制御されながら所定温度域内に保持
されるので、燃料の加温の過不足を無くすことができ
る。(1) In the first aspect of the present invention, the fuel heating means 4 is provided in the fuel supply passage 3, so that the fuel in the fuel supply passage 3 is heated to a predetermined temperature range by the heating means 4. Therefore, the viscosity of the fuel can be suppressed to be low even in cold weather, and the suction rate of the fuel injection pump 2 can be prevented from decreasing. Further, since the fuel is held in the predetermined temperature range while being controlled in temperature by the heating temperature control means 5, it is possible to eliminate excess or deficiency in heating the fuel.
【０００８】（2）本発明２では、水冷エンジンＥの冷
却水の熱を利用して燃料を加温するので、燃料加温のた
めの専用のヒータなどの熱源が要らない。(2) In the present invention 2, the heat of the cooling water of the water-cooled engine E is used to heat the fuel, so a heat source such as a dedicated heater for heating the fuel is not required.
【０００９】[0009]
（1）本発明１では、燃料加温手段で燃料を所定温度域
に加温するので、寒冷時でも燃料の粘性を低く抑えて燃
料噴射ポンプの吸入率の低下を防止し、エンジン出力の
低下を防止できる。 （2）本発明２では、エンジンの冷却水の熱を利用して
燃料を加温するので、燃料加温のための専用のヒータな
どの熱源が要らず、安価に実施できる。(1) In the present invention 1, since the fuel is heated to a predetermined temperature range by the fuel heating means, the viscosity of the fuel is suppressed to a low level even in cold weather to prevent a reduction in the intake rate of the fuel injection pump and a reduction in engine output. Can be prevented. (2) In the second aspect of the present invention, the heat of the engine cooling water is used to heat the fuel, so a heat source such as a dedicated heater for heating the fuel is not required, and the present invention can be performed at low cost.
【００１０】[0010]
【実施例】以下、本発明の実施例を図面に基づいて述べ
る。図１は縦型水冷ディーゼルエンジンの燃料供給装置
の概略系統図である。図１に示すように、縦型ディーゼ
ルエンジンＥに燃料タンク１を搭載し、燃料タンク１を
燃料供給路３で燃料フィルタ１２及びフィードポンプ１
１を介して燃料噴射ポンプ２に接続し、燃料タンク１の
燃料を燃料フィルタ１２で濾過し、フィードポンプ１１
で圧送して燃料噴射ポンプ２に燃料供給可能に構成す
る。尚、燃料は燃料噴射ポンプ２により高圧吐出路１３
から各燃料噴射ノズル４に送られ、当該ノズル１４から
燃焼室に噴射される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic system diagram of a fuel supply device for a vertical water-cooled diesel engine. As shown in FIG. 1, a vertical diesel engine E is equipped with a fuel tank 1, and the fuel tank 1 is connected to a fuel filter 12 and a feed pump 1 through a fuel supply passage 3.
1 is connected to the fuel injection pump 2 to filter the fuel in the fuel tank 1 by the fuel filter 12,
It is configured so that fuel can be supplied to the fuel injection pump 2 by pressure feeding. The fuel is injected by the fuel injection pump 2 into the high pressure discharge passage 13
Is sent to each fuel injection nozzle 4 and injected from the nozzle 14 into the combustion chamber.
【００１１】上記ディーゼルエンジンＥの前方にラジエ
ータ１５を配置し、エンジン本体に設けたウォータジャ
ケット（図示省略）の出口路１６をラジエータ１５の上
タンク１５ａに接続し、ラジエータ１５の下タンク１５
ｂをウォータポンプ１８を介してウォータジャケットの
入口路１９に接続して、ウォータジャケットとラジエー
タ１５との間で冷却水を循環させ、ウォータジャケット
内で加熱された冷却水をラジエータ５で放熱させるよう
にして、水冷装置を構成する。A radiator 15 is arranged in front of the diesel engine E, an outlet passage 16 of a water jacket (not shown) provided in the engine body is connected to an upper tank 15a of the radiator 15, and a lower tank 15 of the radiator 15 is connected.
b is connected to the inlet path 19 of the water jacket via the water pump 18 to circulate the cooling water between the water jacket and the radiator 15 so that the radiator 5 dissipates the cooling water heated in the water jacket. Then, the water cooling device is configured.
【００１２】上記ラジエータ１５の上タンク１５ａから
導出した冷却水路６を下タンク１５ｂに連通して、ラジ
エータ１５に対して当該冷却水路６を並列接続する。当
該冷却水路６に加温水槽７を介装し、前記燃料供給路３
のうちの燃料フィルタ１２の流通上手側を加温水槽７内
に蛇腹状に通して、燃料供給路３の燃料と加温水槽７の
冷却水とを熱交換可能にして、当該加温水槽７で燃料加
温手段５を構成する。The cooling water passage 6 led out from the upper tank 15a of the radiator 15 is connected to the lower tank 15b, and the cooling water passage 6 is connected in parallel to the radiator 15. A heating water tank 7 is provided in the cooling water passage 6, and the fuel supply passage 3
The upstream side of the fuel filter 12 is passed through the heating water tank 7 in a bellows shape so that the fuel in the fuel supply passage 3 and the cooling water in the heating water tank 7 can exchange heat with each other. Constitutes the fuel heating means 5.
【００１３】上記冷却水路６のうちの加温水槽７の流通
上手側に流量調節弁８を配置し、燃料供給路３のうちの
燃料噴射ポンプ２の入口側に温度検出器１０を臨ませ
る。この温度検出器１０を流量制御装置１７を介して流
量調節弁８に接続したもので、加熱温度制御手段５を構
成する。即ち、温度検出器１０による燃料の検出温度が
下限設定温度以下に低下すると、冷却水路６の流量調節
弁８を開弁側に操作して冷却水量を増やすとともに、検
出温度が上限設定温度以上に高くなると、流量調節弁８
を閉弁側に操作して冷却水量を減して、燃料供給路３内
の燃料を所定温度域（例えば、加温水槽７の冷却水温が
４５℃の場合、３８±２℃）内に保持する。A flow rate control valve 8 is arranged on the side of the cooling water passage 6 on the circulation side of the heating water tank 7, and a temperature detector 10 is exposed on the inlet side of the fuel injection pump 2 of the fuel supply passage 3. The temperature detector 10 is connected to the flow rate control valve 8 via the flow rate control device 17, and constitutes the heating temperature control means 5. That is, when the temperature detected by the temperature detector 10 for the fuel drops below the lower limit set temperature, the flow rate control valve 8 of the cooling water passage 6 is operated to the opening side to increase the amount of cooling water, and the detected temperature rises above the upper limit set temperature. When it becomes higher, the flow rate control valve 8
To close the valve to reduce the amount of cooling water and keep the fuel in the fuel supply passage 3 within a predetermined temperature range (for example, 38 ± 2 ° C. when the cooling water temperature of the heating water tank 7 is 45 ° C.). To do.
【００１４】上記実施例では、温度検出器１０を燃料噴
射ポンプ２の入口側に臨ませて、エンジン冷却水で加熱
されて当該噴射ポンプ２に流入する直前の燃料の温度を
検出して、フィードバック的に加温水槽７での加熱温度
を制御するように構成してある。しかしながら、図１の
仮想線で示すように、温度検出器１０を加温水槽７に臨
ませて冷却水温を検出するようにしても良いし、燃料供
給路３のうちの加温水槽７の流通上手側に温度検出器１
０を臨ませて加熱前の燃料温度を検出し、フィードフォ
ワード的に制御するように構成しても差し支えない。な
お、符号２０は余剰燃料戻し路である。In the above embodiment, the temperature detector 10 is made to face the inlet side of the fuel injection pump 2, and the temperature of the fuel immediately before it is heated by the engine cooling water and flows into the injection pump 2 is detected and fed back. The heating temperature in the warm water tank 7 is controlled to be controlled. However, as shown by the phantom line in FIG. 1, the temperature detector 10 may be made to face the heating water tank 7 to detect the cooling water temperature, or the circulation of the heating water tank 7 in the fuel supply passage 3 may be performed. Temperature sensor 1 on the good side
The fuel temperature before heating may be detected by facing 0, and control may be performed in a feedforward manner. Reference numeral 20 is a surplus fuel return path.
【００１５】そこで、本実施例の燃料供給装置の機能を
説明すると、燃料供給路３に燃料加温手段４を介装する
ので、燃料供給路３を流れる燃料を当該加温手段４で所
定温度域に加温できる。このため、寒冷時でも燃料の粘
性を低く抑制して燃料噴射ポンプ２の吸入率の低下を円
滑に防止し、エンジン出力を高精度に安定化できる。ま
た、当該燃料加温手段４は水冷ディーゼルエンジンＥの
冷却水系を利用したものなので、燃料加温のための専用
のヒータなどの熱源が要らず、安価に実施できる。Therefore, the function of the fuel supply system of this embodiment will be explained. Since the fuel heating means 4 is provided in the fuel supply path 3, the fuel flowing in the fuel supply path 3 is heated to a predetermined temperature by the heating means 4. Can warm the area. Therefore, even in cold weather, the viscosity of the fuel can be suppressed to be low, the intake rate of the fuel injection pump 2 can be prevented from decreasing, and the engine output can be stabilized with high accuracy. Further, since the fuel heating means 4 uses the cooling water system of the water-cooled diesel engine E, it does not require a heat source such as a dedicated heater for heating the fuel and can be implemented at low cost.
【００１６】尚、本発明は、上記実施例のようにフィー
ドポンプ１１で燃料を燃料タンク１から燃料噴射ポンプ
２に圧送供給する形式の燃料供給装置に限らず、燃料タ
ンク１を燃料噴射ポンプ２に対して高位置に配置し、そ
の水頭差で燃料を供給する形式の装置にも適用できる。The present invention is not limited to the fuel supply device of the type in which the fuel is pumped from the fuel tank 1 to the fuel injection pump 2 by the feed pump 11 as in the above embodiment, but the fuel tank 1 is supplied to the fuel injection pump 2. It can also be applied to a device of a type which is arranged at a high position with respect to and supplies fuel by the head difference.
【図１】実施例を示す水冷ディーゼルエンジンの燃料供
給装置の概略系統図である。FIG. 1 is a schematic system diagram of a fuel supply device for a water-cooled diesel engine showing an embodiment.
【図２】従来技術を示す図１の相当図である。FIG. 2 is a view equivalent to FIG. 1 showing a conventional technique.
１…燃料タンク、２…燃料噴射ポンプ、３…燃料供給
路、４…燃料加温手段、５…加熱温度制御手段、６…冷
却水路、７…加温水槽、８…流量調節弁、１０…温度検
出器、１７…流量制御装置、Ｅ…ディーゼルエンジン。DESCRIPTION OF SYMBOLS 1 ... Fuel tank, 2 ... Fuel injection pump, 3 ... Fuel supply path, 4 ... Fuel heating means, 5 ... Heating temperature control means, 6 ... Cooling water path, 7 ... Heating water tank, 8 ... Flow control valve, 10 ... Temperature detector, 17 ... Flow control device, E ... Diesel engine.
Claims (2)
（１）及び燃料噴射ポンプ（２）を設け、燃料タンク
（１）を燃料供給路（３）を介して燃料噴射ポンプ
（２）に燃料供給可能に接続したディーゼルエンジンの
燃料供給装置において、 上記燃料供給路（３）に燃料加温手段（４）を介装し、 加熱温度制御手段（５）で燃料加温手段（４）の加熱量
を制御して、燃料供給路（３）内の燃料を所定温度域内
に保持するように構成したことを特徴とするディーゼル
エンジンの燃料供給装置。1. A diesel engine (E) is provided with a fuel tank (1) and a fuel injection pump (2), and the fuel tank (1) supplies fuel to the fuel injection pump (2) through a fuel supply passage (3). In a fuel supply device for a diesel engine that is operably connected, a fuel heating means (4) is provided in the fuel supply path (3), and a heating amount of the fuel heating means (4) is controlled by a heating temperature control means (5). Is controlled to maintain the fuel in the fuel supply passage (3) within a predetermined temperature range.
置に冷却水路（６）を並列状に接続し、この冷却水路
（６）に加温水槽（７）と流量調節弁（８）を介装し、 加熱水槽（７）内に燃料供給路（３）を通して燃料供給
路（３）の燃料と加温水槽（７）の冷却水とを熱交換可
能に構成して、この加温水槽（７）で前記燃料加温手段
（４）を構成し、 上記燃料供給路（３）と冷却水路（６）とのいずれかに
温度検出器（１０）を臨ませ、この温度検出器（１０）
を流量制御装置（１７）を介して上記流量調節弁（８）
に制御操作可能に接続したもので、前記加熱温度制御手
段（５）を構成し、 上記流量制御装置（１７）は、温度検出器（１０）の検
出温度に基づき、流量調節弁（８）を弁開閉操作または
弁開量調節操作するように構成したことを特徴とする請
求項１に記載のディーゼルエンジンの燃料供給装置。2. A water cooling device of a water-cooled diesel engine (E) is connected in parallel with a cooling water passage (6), and a heating water tank (7) and a flow control valve (8) are interposed in this cooling water passage (6). Then, the fuel in the fuel supply passage (3) and the cooling water in the heating water tank (7) are configured to be capable of exchanging heat through the fuel supply passage (3) in the heating water tank (7). ) Constitutes the fuel heating means (4), and the temperature detector (10) is made to face either the fuel supply passage (3) or the cooling water passage (6), and this temperature detector (10)
The flow rate control valve (8) through the flow rate control device (17)
The heating temperature control means (5) is configured to control the flow rate control valve (8) based on the temperature detected by the temperature detector (10). The fuel supply device for a diesel engine according to claim 1, wherein the fuel supply device is configured to perform a valve opening / closing operation or a valve opening amount adjusting operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18073893A JPH0712023A (en) | 1993-06-25 | 1993-06-25 | Fuel supply device for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18073893A JPH0712023A (en) | 1993-06-25 | 1993-06-25 | Fuel supply device for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0712023A true JPH0712023A (en) | 1995-01-17 |
Family
ID=16088453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18073893A Pending JPH0712023A (en) | 1993-06-25 | 1993-06-25 | Fuel supply device for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0712023A (en) |
-
1993
- 1993-06-25 JP JP18073893A patent/JPH0712023A/en active Pending
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