JPS5985474A - Fuel pump control device - Google Patents

Fuel pump control device

Info

Publication number
JPS5985474A
JPS5985474A JP19395282A JP19395282A JPS5985474A JP S5985474 A JPS5985474 A JP S5985474A JP 19395282 A JP19395282 A JP 19395282A JP 19395282 A JP19395282 A JP 19395282A JP S5985474 A JPS5985474 A JP S5985474A
Authority
JP
Japan
Prior art keywords
switch
fuel
pump
fuel pump
turned
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
JP19395282A
Other languages
Japanese (ja)
Inventor
Taketo Kato
加藤 武登
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.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP19395282A priority Critical patent/JPS5985474A/en
Publication of JPS5985474A publication Critical patent/JPS5985474A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04Feeding by means of driven pumps
    • F02M37/08Feeding by means of driven pumps electrically driven
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04Feeding by means of driven pumps
    • F02M37/08Feeding by means of driven pumps electrically driven
    • F02M2037/085Electric circuits therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE:To prevent fuel from continuously leaking when a delivery pipe, etc. is damaged by detecting a fuel leak through an electric current flowing through a fuel pump and stopping the fuel pump. CONSTITUTION:When a starting switch ST is turned on, a relay circuit RL1 operates causing a fuel pump M to be energized the flap in an air-flow meter is opened, a pump switch PS is turned on and, if a current I flowing through the fuel pump M is in the regular range, a switch SW2 is turned on due to the action of a relay circuit RL2, and the fuel pump M is maintained in a normally energized condition. If an engine is stalled, the flap in the air-flow meter is completely closed, the pump switch PS is turned off, and the pump is stopped. When the flow of a current becomes less than a set value due to the reduction of fuel pressure caused by the damage of a delivery pipe, etc., the switch SW2 in the relay circuit RL2 is turned off, and the fuel pump M is stopped. Thereby the leak of fuel can be prevented.

Description

【発明の詳細な説明】 本発明は内燃機関の燃料ポンプ制御装置に関する。[Detailed description of the invention] The present invention relates to a fuel pump control device for an internal combustion engine.

従来のEFI(’4子制御式燃料噴射)における燃料ポ
ンプは、機関が回転しているか、もしくはクランキング
のときだけ駆動するように制御されている。つまり、何
らかの原因で機関の回転が停止すると、イグニッション
スイッチがオンであっても、エアフローメータのフラッ
プが全閉となり、この結果、エアフローメータ内に設け
られたボン7’スイツチがオフとなって燃料ポンプが停
止するようになっている。
The fuel pump in conventional EFI (quadruple controlled fuel injection) is controlled to be driven only when the engine is rotating or cranking. In other words, if the engine stops rotating for some reason, even if the ignition switch is on, the flap of the air flow meter will be fully closed, and as a result, the Bonn 7' switch installed inside the air flow meter will be turned off and the fuel will be turned off. The pump is now stopped.

しかしながら、上述の従来形においては、燃料系たとえ
ばデリバリd’イグ等が破損して燃料洩れを引起こした
場合、機関が回転していれば、燃料ポンプは停止せず、
従って、燃料洩れが持続するという問題があった。
However, in the conventional type described above, if the fuel system, such as the delivery d'ig, is damaged and fuel leaks, the fuel pump will not stop as long as the engine is rotating.
Therefore, there was a problem that fuel leakage continued.

本発明の目的は、予述の従来形における問題点に鑑み、
燃料Iングに流れる電流によシ燃圧の低下すなわち燃料
洩れを検出し、この検出結果にもとづいて燃料ポンプへ
の供給電流をしゃ断して燃料ポンプを停止させ、これに
より、燃料洩れを最小限にすることにおる。
The purpose of the present invention is to solve the above-mentioned problems in the conventional form.
A drop in fuel pressure, that is, a fuel leak, is detected by the current flowing through the fuel injection ring, and based on this detection result, the current supplied to the fuel pump is cut off to stop the fuel pump, thereby minimizing fuel leakage. I am going to do something.

上述の目的を達成するために本発明によれば、スタート
スイッチのオン、あるいはイグニッン1ンスイッチのオ
ン且つエアフローメータ内のボンデスイッチのオンによ
って燃料ポンプを駆動させる燃料ポンプ制御装置におい
て、前記燃料ポンプを流れる電流を検出する検出手段と
、前記イグニッションスイッチに直列に設けられた常開
スイッチと、および前記検出手段によって検出された電
流が所定値以上のときに前記常開スイッチを閉にするス
イッチ駆動手段とを具備したことを特徴とする燃料ポン
プ制御装置が提供される。
To achieve the above object, the present invention provides a fuel pump control device that drives a fuel pump by turning on a start switch, turning on an ignition switch, and turning on a bond switch in an air flow meter. a normally open switch provided in series with the ignition switch; and a switch drive that closes the normally open switch when the current detected by the detecting means is equal to or higher than a predetermined value. A fuel pump control device is provided, characterized in that it comprises means.

以下、図面によシ本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail with reference to the drawings.

@1図は本発明に係る燃料ポンプ制御装置の一実施例を
示す回路図である。第1図において、Mは燃料ポンプ、
RLlはスイッチSWIおよびコイルL1により構成さ
れるリレー回路、STはスタートスイッチ、工Gはイグ
ニッションスイッチ、PSはエアフローセンサ(図示せ
ず)内に設けられたポンプスイッチである。
@1 Figure is a circuit diagram showing an embodiment of a fuel pump control device according to the present invention. In FIG. 1, M is a fuel pump;
RLl is a relay circuit composed of a switch SWI and a coil L1, ST is a start switch, G is an ignition switch, and PS is a pump switch provided in an air flow sensor (not shown).

R1、RL2 、R2は本発明により付加されたもので
ある。ここで、R1は燃料ポンプ間に流れる電i1を検
出するだめの電流検出用抵抗である。
R1, RL2, and R2 are added according to the present invention. Here, R1 is a current detection resistor for detecting the electricity i1 flowing between the fuel pumps.

また、リレー回路RL2における常開スイッチSW2は
イグニッシlンスイッチIG、yJ?ンプスイッチPS
に直列に接続されておシ、リレー回路RL2におけるコ
イルL2は抵抗R1に流れる電流が所定値以上のときに
スイッチSW2をオンにする。この所定値は可変抵抗R
2によって調整される。なお、スイッチSW3は空気抜
き用であって、通常、開にされている。
Also, the normally open switch SW2 in the relay circuit RL2 is the ignition switch IG, yJ? pump switch PS
The coil L2 in the relay circuit RL2 turns on the switch SW2 when the current flowing through the resistor R1 is equal to or higher than a predetermined value. This predetermined value is the variable resistance R
Adjusted by 2. Note that the switch SW3 is for venting air and is normally left open.

燃料ポンプMを流れる電流工と燃圧Pとの関係は第2図
の曲線Cに示すような関係がある。そして、燃圧Pは、
通常、P1〜P2  (たとえば2.5〜5.0 kg
 / t*2)の範囲になるようにレギュレータ(リリ
ーフバルブ、図示せず)に′よって制御されている。し
かし、デリバリパルプ等の損傷により燃料洩れが起こる
と、燃圧が低下し、電流Iも低下する。本発明はこれを
利用して燃料洩れを検出している。
The relationship between the electric current flowing through the fuel pump M and the fuel pressure P is as shown by the curve C in FIG. And the fuel pressure P is
Usually P1-P2 (e.g. 2.5-5.0 kg
/t*2) by a regulator (relief valve, not shown). However, if fuel leaks due to damage to the delivery pulp or the like, the fuel pressure decreases and the current I also decreases. The present invention utilizes this to detect fuel leakage.

つまυ、可変抵抗R2を調整することによシ、リレー回
路RL2において、1% (IF−Iが第2図における
工1以上のときにスイッチSW2がオンとなるようにし
である。逆に、燃圧低下によシミ流工が工1未満となっ
たときにスイッチSW2はオフとなるようにしである。
By adjusting the variable resistor R2, the switch SW2 is set to turn on when 1% (IF-I) is greater than or equal to 1 in the relay circuit RL2.On the contrary, The switch SW2 is configured to be turned off when the fuel pressure decreases and the stain drop becomes less than 1.

第1図の装置動作を説明する。機関の始動前にあっては
、ポンプスイッチPSおよびスイッチSW2は共にオフ
である。従って、イグニッションスイッチIGがオンと
なっただけでは燃料ポンプMには通電されない。次に、
スタートスイッチSTがオンとガると、リレー回路RE
、1が動作して燃料ポンfMに通電され、この結果、エ
アフローメータのフラップが開放されてポンプスイッチ
PSがオンとなり、且つ燃料ポンプMに流、れる電流I
が正常な範囲にあればリレー回路RL2の動作によ如ス
イッチSW2はオンとなる。従って、機関が始動後にス
タートスイッチSTがオフになっても、イグニッシ1ン
スイッチIG、yj?ンプスイッチPSおよびスイッチ
SW2がオンであるので、燃料ポンプMは通電状態に保
持される。
The operation of the apparatus shown in FIG. 1 will be explained. Before starting the engine, both pump switch PS and switch SW2 are off. Therefore, the fuel pump M is not energized just by turning on the ignition switch IG. next,
When the start switch ST turns on, the relay circuit RE
.
If it is within the normal range, switch SW2 is turned on by the operation of relay circuit RL2. Therefore, even if the start switch ST is turned off after the engine starts, the ignition switch IG, yj? Since the pump switch PS and the switch SW2 are on, the fuel pump M is kept energized.

上述の状態において、伺らかの理由でエンジンストール
を引起こせば、エアフローメータ内フラッグが全閉位置
となシ、この結果、ポンプスイ。
In the above condition, if the engine stalls for some reason, the flag in the air flow meter will not be in the fully closed position, and as a result, the pump will stall.

チPSがオフとなり、燃料ポンfMは停止する。PS is turned off and fuel pump fM stops.

また、上述の状態において、デリバリ/やイブの破損等
により燃圧が低下して電流■が設定値11未満になると
、リレー回路RL2においてスイッチSW2がオフとな
シ、やは多燃料ボン7”Mは停止する。従って、燃料洩
れも停止する。しかる後に、インジェクタ交換等の作業
が行われることになる。
In addition, in the above-mentioned state, if the fuel pressure decreases due to damage to the delivery cylinder or the eve, and the current ■ becomes less than the set value 11, the switch SW2 in the relay circuit RL2 is turned off, and the multi-fuel cylinder 7''M will stop.Therefore, fuel leakage will also stop.After that, work such as injector replacement will be performed.

もちろん、イグニッションスイッチェGヲオフにすれば
、燃料ポンfMは停止する。
Of course, if the ignition switch G is turned off, the fuel pump fM will stop.

燃料・臂イブラインの保守後に、空気抜き作業が必要で
ある。この場合、スイッチSW3.をオンにして機関を
始動させる。この作業終了後にはスイッチSW3をオフ
に戻しておく。
Air purge work is required after maintenance of the fuel and armature lines. In this case, switch SW3. Turn on and start the engine. After completing this work, turn off the switch SW3.

なお、上述の実施例においては、スイッチ堤等をリレー
回路によ多構成しているが、トランジスタ等のスイッチ
ング素子、比較回路によっても構成できる。
In the above-described embodiments, the switch bank and the like are configured as relay circuits, but they can also be configured as switching elements such as transistors and comparison circuits.

以上説明したように本発明によれば、燃料洩れによる燃
圧低下を検出して燃iyJ?ングを停止させることかで
き、従って、燃料洩れを最小限にできる。
As explained above, according to the present invention, a decrease in fuel pressure due to fuel leakage is detected and the fuel pressure is detected. Therefore, fuel leakage can be minimized.

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

第1図は本発明に係る燃料ポンプ制御装置の一実施例を
示す回路図、第2図は第1図の電流Iと燃圧Pとの関係
を示すグラフである。 ST・・・スタートスイッチ、IG・・・イグニッショ
ンスイッチ、PS・・・ポンプスイッチ、R1・・・電
流検出用抵抗、SW2・・・常開スイッチ、C2・・・
コイル(スイッチ駆動手段)。 特許出願人 トヨタ自動車株式会社 特許出願代理人 弁理士 青 木   朗 弁理士西舘和之 弁理士  山  口  昭  之
FIG. 1 is a circuit diagram showing an embodiment of a fuel pump control device according to the present invention, and FIG. 2 is a graph showing the relationship between the current I and the fuel pressure P shown in FIG. ST...Start switch, IG...Ignition switch, PS...Pump switch, R1...Resistor for current detection, SW2...Normally open switch, C2...
Coil (switch drive means). Patent applicant Toyota Motor Corporation Patent agent Akira Aoki Patent attorney Kazuyuki Nishidate Patent attorney Akira Yamaguchi

Claims (1)

【特許請求の範囲】[Claims] 1、 スタートスイッチのオン、あるいはイグニッショ
ンスイッチのオン且つエア70−メータ内のポンプスイ
ッチのオンによって燃料ポンプを駆動させる燃料ポンプ
制御装置において、前記燃料ポンプを流れる電流を検出
する検出手段と、前記イグニッションスイッチに直列に
設けられた常開スイッチと、および前記検出手段によっ
て検出された電流が所定値以上のときに前記常開スイッ
チを閉にするスイッチ駆動手段とを具備したことを特徴
とする燃料?ング制御装置。
1. In a fuel pump control device that drives a fuel pump by turning on a start switch or turning on an ignition switch and turning on a pump switch in an air meter, a detection means for detecting a current flowing through the fuel pump; A fuel characterized by comprising: a normally open switch provided in series with the switch; and switch driving means for closing the normally open switch when the current detected by the detecting means is equal to or greater than a predetermined value. control device.
JP19395282A 1982-11-06 1982-11-06 Fuel pump control device Pending JPS5985474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19395282A JPS5985474A (en) 1982-11-06 1982-11-06 Fuel pump control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19395282A JPS5985474A (en) 1982-11-06 1982-11-06 Fuel pump control device

Publications (1)

Publication Number Publication Date
JPS5985474A true JPS5985474A (en) 1984-05-17

Family

ID=16316483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19395282A Pending JPS5985474A (en) 1982-11-06 1982-11-06 Fuel pump control device

Country Status (1)

Country Link
JP (1) JPS5985474A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6352962U (en) * 1986-09-24 1988-04-09
JPS63235658A (en) * 1987-03-24 1988-09-30 Honda Motor Co Ltd Minimum flow recirculating system for fuel pump
JPH0628259U (en) * 1992-09-14 1994-04-15 日産ディーゼル工業株式会社 Electric oil pump control device
EP1059430A1 (en) * 1999-06-10 2000-12-13 BITRON S.p.A. A controlled-pressure fuel-supply system for an internal combustion engine, particularly for motor vehicles
JP2011236791A (en) * 2010-05-10 2011-11-24 Bosch Corp Control apparatus of electric supply pump

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6352962U (en) * 1986-09-24 1988-04-09
JPS63235658A (en) * 1987-03-24 1988-09-30 Honda Motor Co Ltd Minimum flow recirculating system for fuel pump
JPH0628259U (en) * 1992-09-14 1994-04-15 日産ディーゼル工業株式会社 Electric oil pump control device
EP1059430A1 (en) * 1999-06-10 2000-12-13 BITRON S.p.A. A controlled-pressure fuel-supply system for an internal combustion engine, particularly for motor vehicles
JP2011236791A (en) * 2010-05-10 2011-11-24 Bosch Corp Control apparatus of electric supply pump

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