JP2014020350A - Fuel injection device - Google Patents

Fuel injection device Download PDF

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Publication number
JP2014020350A
JP2014020350A JP2012163147A JP2012163147A JP2014020350A JP 2014020350 A JP2014020350 A JP 2014020350A JP 2012163147 A JP2012163147 A JP 2012163147A JP 2012163147 A JP2012163147 A JP 2012163147A JP 2014020350 A JP2014020350 A JP 2014020350A
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Prior art keywords
valve
metering valve
pressure reducing
pressure
reducing valve
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JP2012163147A
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JP5737233B2 (en
Inventor
Hideo Naruse
英生 成瀬
Hiroshi Watanabe
博 渡辺
Masahide Kajikawa
真秀 梶川
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Denso Corp
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Denso Corp
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Priority to JP2012163147A priority Critical patent/JP5737233B2/en
Priority to DE102013107627.0A priority patent/DE102013107627B4/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
    • F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits

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

Abstract

PROBLEM TO BE SOLVED: To provide a fuel injection device which detects "ground fault of the electric current downstream side of a metering valve" and avoids that "a high-pressure pump is unintentionally actuated" "upon actuation of a pressure reduction valve".SOLUTION: When a voltage is lowered to substantial ground voltage (substantial 0 V) although a predetermined voltage (several V) is applied to the electric current supply side to a metering valve 3 and a pressure reduction valve 6 in such a state that both of the metering valve 3 and the pressure reduction valve 6 are not selected, "the ground fault of the electric current downstream side of the metering valve 3" is determined and the energization of the pressure reduction valve 6 is stopped (concretely, an energization period of the pressure reduction valve 6 is restricted up to the energization length during which the high-pressure pump does not eject fuel or the actuation timing of the pressure reducing valve 6 is changed into the pump timing on which the high-pressure pump does not eject fuel). Thereby, such a failure that "the high-pressure pump unintentionally is actuated" does not occur and such a failure that an excessive load is applied to a component or a member to which a common rail pressure is applied can be avoided.

Description

本発明は、「高圧ポンプの調量弁（ＰＣＶ）」と「コモンレールの減圧弁（ＰＲＶ）」を選択駆動する燃料噴射装置に関する。   The present invention relates to a fuel injection device that selectively drives a “high-pressure pump metering valve (PCV)” and a “common rail pressure reducing valve (PRV)”.

〔従来技術〕
特許文献１には、
（ｉ）先ず、コンデンサに蓄えた大電力エネルギー（バッテリ電圧を昇圧回路で昇圧させコンデンサで蓄圧した電気エネルギー）を「電磁アクチュエータ」に印加し、
（ｉｉ）続いて、バッテリ電圧を制御して「電磁アクチュエータ」に与える技術が開示されている。 [Conventional technology]
In Patent Document 1,
(I) First, high-power energy stored in the capacitor (electric energy stored in the capacitor by boosting the battery voltage with the booster circuit) is applied to the “electromagnetic actuator”.
(Ii) Subsequently, a technique is disclosed in which the battery voltage is controlled and applied to the “electromagnetic actuator”.

〔従来技術の問題点〕
上記特許文献１の技術を用いて、「高圧ポンプの調量弁」と「コモンレールの減圧弁」を選択駆動することが考えられる。
その場合、図１（ｂ）に示すように、「高圧ポンプの調量弁３」の電流下流側が何らかの不具合により地絡（図中、短絡箇所Ｘ参照）したことを仮定すると、「減圧弁６を作動」させるべく減圧弁６に駆動電流を付与した場合は、調量弁３と減圧弁６の両方に駆動電流が流れ、「減圧弁６が作動」するとともに、「高圧ポンプも作動」してしまう。 [Problems of the prior art]
It is conceivable to selectively drive the “high-pressure pump metering valve” and the “common rail pressure-reducing valve” using the technique disclosed in Patent Document 1.
In this case, as shown in FIG. 1B, assuming that the current downstream side of the “high-pressure pump metering valve 3” has a ground fault (refer to the short-circuit point X in the figure) due to some trouble, the “pressure reducing valve 6 When a drive current is applied to the pressure reducing valve 6 in order to “activate”, the drive current flows through both the metering valve 3 and the pressure reducing valve 6, “the pressure reducing valve 6 is activated” and “the high pressure pump is also activated”. End up.

「減圧弁６を作動」させる際は、コモンレール圧を降下させたい時であるが、調量弁３の通電により「高圧ポンプが意図せずに作動」することで、高圧燃料がコモンレールに供給されてしまう。
その結果、最悪の場合には、コモンレール圧が上昇して、コモンレール圧が加わる部品や部材に設計値を超えた過大な負荷が加わる懸念がある。 When the "pressure reducing valve 6 is actuated", it is a time when the common rail pressure is to be lowered. When the metering valve 3 is energized, the "high pressure pump is actuated unintentionally", whereby high pressure fuel is supplied to the common rail. End up.
As a result, in the worst case, the common rail pressure rises, and there is a concern that an excessive load exceeding the design value is applied to components and members to which the common rail pressure is applied.

特開２００２−２９５２９３号公報JP 2002-295293 A

本発明は、上記問題点に鑑みてなされたものであり、その目的は、高圧ポンプにおける「調量弁の電流下流側の地絡」を検出して、「減圧弁の作動時」に「高圧ポンプが意図せずに作動」するのを回避できる燃料噴射装置の提供にある。   The present invention has been made in view of the above problems, and its purpose is to detect a “ground fault on the current downstream side of a metering valve” in a high-pressure pump, It is an object of the present invention to provide a fuel injection device that can prevent the pump from “unintentionally operating”.

本発明の燃料噴射装置は、調量弁と減圧弁の両方の選択が成されていない状態で、調量弁と減圧弁への電流供給側に所定電圧を印加しても、調量弁と減圧弁への電流供給側の電圧が略グランド電圧に低下する時は、高圧ポンプにおける「調量弁の電流下流側の地絡」を判定する。
このように、本発明によって高圧ポンプにおける「調量弁の電流下流側の地絡」が判定できるため、「減圧弁の作動時」に「高圧ポンプが意図せずに作動」するのを回避することができ、コモンレール圧が加わる部品や部材に設計値を超えた過大な負荷が加わる懸念を無くすことができる。 Even if a predetermined voltage is applied to the current supply side to the metering valve and the pressure reducing valve in a state where both the metering valve and the pressure reducing valve are not selected, the fuel injection device of the present invention When the voltage on the current supply side to the pressure reducing valve drops to approximately the ground voltage, the “ground fault on the current downstream side of the metering valve” in the high pressure pump is determined.
As described above, according to the present invention, the “ground fault on the current downstream side of the metering valve” in the high-pressure pump can be determined, so that “unintentionally operating the high-pressure pump” is avoided when “the pressure reducing valve is operating”. Therefore, it is possible to eliminate the concern that an excessive load exceeding the design value is applied to the parts and members to which the common rail pressure is applied.

（ａ）制御装置の要部回路図、（ｂ）「調量弁の電流下流側の地絡時」に減圧弁が選択された状態の回路説明図、（ｃ）「調量弁の電流下流側の地絡時」に調量弁が選択された状態の回路説明図である。(A) Circuit diagram of the main part of the control device, (b) Circuit explanatory diagram in a state where the pressure reducing valve is selected at the time of “earth fault on the current downstream side of the metering valve”, (c) “Current downstream of the metering valve” FIG. 10 is a circuit explanatory diagram in a state where a metering valve is selected at the time of “ground fault on the side”. 燃料噴射装置のシステム構成図である。It is a system configuration figure of a fuel injection device. 高圧ポンプの作動説明図である。It is operation | movement explanatory drawing of a high pressure pump. 調量弁および減圧弁の駆動波形図である。It is a drive waveform diagram of a metering valve and a pressure reducing valve. 調量弁の電流下流側の地絡検出方法にかかる説明図である。It is explanatory drawing concerning the ground fault detection method of the electric current downstream of a metering valve. 調量弁の電流下流側の地絡診断のフローチャートである。It is a flowchart of the ground fault diagnosis of the electric current downstream side of a metering valve. 「調量弁の電流下流側の地絡時」に調量弁が選択された際の駆動波形図である。FIG. 6 is a drive waveform diagram when the metering valve is selected “at the time of ground fault on the current downstream side of the metering valve”.

以下、発明を実施するための形態を、図面に基づいて詳細に説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings.

以下で開示する実施例は、本発明の具体的な一例であって、本発明が実施例に限定されないことは言うまでもない。   The examples disclosed below are specific examples of the present invention, and it goes without saying that the present invention is not limited to the examples.

［実施例１］
図１〜図７を参照して実施例１を説明する。
この実施例は、本発明に係る燃料噴射装置を、車両ディーゼルエンジン用の燃料噴射装置に適用したものである。
この燃料噴射装置は、蓄圧式（コモンレール式）であり、図２に示すように、フィードポンプ１、高圧ポンプ２、調量弁３、コモンレール４、レール圧センサ５、減圧弁６、インジェクタ７、制御装置８（ＥＣＵ９＋ＥＤＵ１０）等を備えて構成されている。 [Example 1]
Embodiment 1 will be described with reference to FIGS.
In this embodiment, the fuel injection device according to the present invention is applied to a fuel injection device for a vehicle diesel engine.
This fuel injection device is a pressure accumulation type (common rail type), and as shown in FIG. 2, a feed pump 1, a high pressure pump 2, a metering valve 3, a common rail 4, a rail pressure sensor 5, a pressure reducing valve 6, an injector 7, A control device 8 (ECU9 + EDU10) is provided.

フィードポンプ１は、燃料タンクから燃料を吸入して高圧ポンプ２に供給するものである。
高圧ポンプ２は、図３に示すように、エンジン１１から動力を得て回転するカムシャフトの回転に伴ってプランジャ１２がシリンダ１３内を往復移動することにより、シリンダ１３内に吸入した燃料をシリンダ１３内にて加圧する周知のプランジャポンプである。 The feed pump 1 sucks fuel from a fuel tank and supplies it to the high pressure pump 2.
As shown in FIG. 3, the high-pressure pump 2 is configured so that the plunger 12 reciprocates in the cylinder 13 as the camshaft rotates by obtaining power from the engine 11. 13 is a known plunger pump that pressurizes the inside of the pump.

調量弁３は、高圧ポンプ２の吸入側に設けられてコモンレール４に圧送される燃料の量を調整する調整弁である。
この調量弁３は、常開型の開閉弁を電磁アクチュエータで閉弁させる常開型（ノーマリ・オープン型）の電磁弁であり（限定するものではない）、調量弁３（具体的には電磁アクチュエータにおけるソレノイドコイル）を通電することにより閉弁する。 The metering valve 3 is an adjustment valve that is provided on the suction side of the high-pressure pump 2 and adjusts the amount of fuel pumped to the common rail 4.
This metering valve 3 is a normally open (normally open type) solenoid valve that closes a normally open type on-off valve with an electromagnetic actuator (not limited), and the metering valve 3 (specifically, Is closed by energizing the solenoid coil) in the electromagnetic actuator.

具体的に、この実施例の調量弁３は、図３に示すように、プランジャ１２のリフト時（吐出行程時）に閉弁すると、調量弁３の通電が停止されても、加圧燃料により閉弁状態が維持されるものであり、プランジャ１２が下降（吸入行程）に転じると、加圧燃料の喪失およびリターンスプリングの開弁力により開弁するものである。   Specifically, as shown in FIG. 3, when the metering valve 3 of this embodiment is closed when the plunger 12 is lifted (during the discharge stroke), the metering valve 3 is pressurized even when the metering valve 3 is de-energized. The closed state is maintained by the fuel, and when the plunger 12 moves downward (intake stroke), the valve is opened due to the loss of pressurized fuel and the opening force of the return spring.

高圧ポンプ２の吐出部には、高圧ポンプ２からコモンレール４側に吐出された燃料が高圧ポンプ２に逆流することを防止する吐出弁１４が設けられており、高圧ポンプ２の吐出圧がコモンレール４内の圧力より大きくなったときにのみ吐出弁１４が開き、燃料がコモンレール４に圧送される。   The discharge portion of the high pressure pump 2 is provided with a discharge valve 14 for preventing the fuel discharged from the high pressure pump 2 to the common rail 4 side from flowing back to the high pressure pump 2. Only when the pressure becomes larger than the internal pressure, the discharge valve 14 opens and the fuel is pumped to the common rail 4.

なお、
・図３の実線Ａは調量弁３の駆動電流を示し、
・図３の実線Ｂは調量弁３の開閉状態を示し、
・図３の実線Ｃはプランジャ１２のリフト量を示すものである。 In addition,
The solid line A in FIG. 3 shows the drive current of the metering valve 3,
The solid line B in FIG. 3 shows the open / close state of the metering valve 3,
A solid line C in FIG. 3 indicates the lift amount of the plunger 12.

コモンレール４は、高圧ポンプ２から圧送された燃料を蓄圧し、蓄圧燃料をエンジン運転状態に応じた目標圧力に保持する畜圧容器である。
レール圧センサ５は、実レール圧（コモンレール４の内部圧力）を検出する圧力検出手段であり、検出された実レール圧が目標レール圧（ＥＣＵ９が求めた目標圧力）に一致するように、調量弁３および減圧弁６が制御装置８により制御される。 The common rail 4 is a stock pressure vessel that accumulates fuel pumped from the high-pressure pump 2 and holds the accumulated fuel at a target pressure corresponding to the engine operating state.
The rail pressure sensor 5 is pressure detection means for detecting the actual rail pressure (internal pressure of the common rail 4), and adjusts the detected actual rail pressure so as to match the target rail pressure (target pressure obtained by the ECU 9). The quantity valve 3 and the pressure reducing valve 6 are controlled by the control device 8.

減圧弁６は、実コモンレール圧を素早く降下させるための調整弁である。
この減圧弁６は、常閉型の開閉弁を電磁アクチュエータで開弁させる常閉型（ノーマリ・クローズ型）の電磁弁であり、減圧弁６（具体的には電磁アクチュエータのソレノイドコイル）を通電することにより常閉型の開閉弁を閉弁してコモンレール４に蓄圧された燃料の一部を溢流させ、通電が停止されると閉弁して燃料の溢流を停止するものである。 The pressure reducing valve 6 is a regulating valve for quickly reducing the actual common rail pressure.
This pressure reducing valve 6 is a normally closed type (normally closed type) electromagnetic valve that opens a normally closed type on-off valve by an electromagnetic actuator. The pressure reducing valve 6 (specifically, a solenoid coil of the electromagnetic actuator) is energized. Thus, the normally closed on-off valve is closed to overflow a part of the fuel accumulated in the common rail 4, and when energization is stopped, the valve is closed and the fuel overflow is stopped.

インジェクタ７は、各気筒毎に独立して設けられて、コモンレール４に対して並列接続されるものであり、コモンレール４に蓄圧されている燃料を各気筒内に噴射する燃料噴射弁である。
このインジェクタ７は、常閉型の開閉弁を電磁アクチュエータで開弁させる常閉型の電磁インジェクタ７（ニードルを閉弁させる背圧室の油圧を電磁弁で開閉する２ウェイ・インジェクタ７、ニードルを電磁アクチュエータにより直接駆動するダイレクト・インジェクタ７等）であり、インジェクタ７（具体的には電磁アクチュエータのソレノイドコイル）を通電することにより、ニードルがリフトして燃料噴射を開始し、通電を停止すると燃料の噴射を停止するものである。 The injector 7 is provided independently for each cylinder and is connected in parallel to the common rail 4, and is a fuel injection valve that injects fuel accumulated in the common rail 4 into each cylinder.
This injector 7 is a normally closed electromagnetic injector 7 that opens a normally closed on-off valve with an electromagnetic actuator (a two-way injector 7 that opens and closes the hydraulic pressure of a back pressure chamber that closes the needle with an electromagnetic valve, and a needle. A direct injector 7 or the like directly driven by an electromagnetic actuator). When the injector 7 (specifically, a solenoid coil of the electromagnetic actuator) is energized, the needle is lifted to start fuel injection, and when energization is stopped, the fuel Is stopped.

ＥＣＵ９は、各種メモリ等を搭載する周知のマイクロコンピュータを用いて構成されるものであり、各種センサ（回転角センサ、アクセル開度センサ、レール圧センサ５等）によって検出された車両の運転状態（エンジン１１の運転状態、燃料噴射装置の運転状態、ドライバーの操作状態等）に基づいて、各電気機能部品（調量弁３、減圧弁６、インジェクタ７等）に対して指示信号（指令信号）を与える。   The ECU 9 is configured using a well-known microcomputer equipped with various memories and the like, and the driving state of the vehicle (rotation angle sensor, accelerator opening sensor, rail pressure sensor 5, etc.) detected by various sensors (e.g. Based on the operating state of the engine 11, the operating state of the fuel injection device, the operating state of the driver, etc.), an instruction signal (command signal) is sent to each electric functional component (the metering valve 3, the pressure reducing valve 6, the injector 7, etc.). give.

ＥＤＵ１０は、ＥＣＵ９から与えられる指示信号から駆動信号（駆動パルス）を生成するとともに、センサ信号をＥＣＵ９の読取信号に変換する信号制御部１５を備えるものであり、この信号制御部１５の発生する駆動信号に基づき、調量弁３、減圧弁６、インジェクタ７の通電制御を実施する。   The EDU 10 includes a signal control unit 15 that generates a drive signal (drive pulse) from an instruction signal supplied from the ECU 9 and converts the sensor signal into a read signal of the ECU 9. The drive generated by the signal control unit 15. Based on the signal, energization control of the metering valve 3, the pressure reducing valve 6, and the injector 7 is performed.

以下では、調量弁３と減圧弁６に係るＥＤＵ１０の具体的な電気回路を、図１を参照して説明する。
この実施例のＥＤＵ１０は、調量弁３、減圧弁６、インジェクタ７を通電する際、
（ｉ）先ず、「コンデンサ放電駆動手段」を用いて、コンデンサ１６に蓄えた大電力エネルギーを「電磁アクチュエータ（具体的には、スイッチ手段により選択された調量弁３、減圧弁６、インジェクタ７における電磁アクチュエータ）」に印加し、
（ｉｉ）続いて、「バッテリ駆動手段」を用いて、バッテリ電圧をデューティ比制御して「電磁アクチュエータ（具体的には、スイッチ手段により選択された調量弁３、減圧弁６、インジェクタ７における電磁アクチュエータ）」に与える技術を採用する。 Below, the specific electric circuit of EDU10 which concerns on the metering valve 3 and the pressure reducing valve 6 is demonstrated with reference to FIG.
When the EDU 10 of this embodiment energizes the metering valve 3, the pressure reducing valve 6, and the injector 7,
(I) First, using the “capacitor discharge driving means”, the high-power energy stored in the capacitor 16 is converted into “electromagnetic actuators (specifically, the metering valve 3, the pressure reducing valve 6, the injector 7 selected by the switch means). Applied to the electromagnetic actuator)
(Ii) Subsequently, by using the “battery driving means”, the duty ratio of the battery voltage is controlled and “electromagnetic actuator (specifically, in the metering valve 3, the pressure reducing valve 6 and the injector 7 selected by the switch means) Adopt technology given to "electromagnetic actuator)".

「コンデンサ放電駆動手段」は、
・バッテリ電圧を高電圧に昇圧する昇圧回路１７と、
・昇圧した電荷を蓄えるコンデンサ１６と、
・このコンデンサ１６の蓄えた電荷が昇圧回路１７側へ戻るのを防ぐ逆流防止用ダイオード１８と、
・コンデンサ１６の蓄えた大電力エネルギーを調量弁３と減圧弁６の電力供給ラインＣＯＭに印加する高電圧制御用のトランジスタ１９、
を備えて構成される。 "Capacitor discharge driving means"
A booster circuit 17 that boosts the battery voltage to a high voltage;
A capacitor 16 for storing the boosted charge;
A backflow prevention diode 18 for preventing the charge stored in the capacitor 16 from returning to the booster circuit 17 side;
A high-voltage control transistor 19 for applying the large power energy stored in the capacitor 16 to the power supply line COM of the metering valve 3 and the pressure reducing valve 6;
It is configured with.

なお、昇圧回路１７は、バッテリの電源ラインＶｄｄとグランド（アース接地）の間に介在させたインダクタンス２０を昇圧用のトランジスタ２１で高速に繰り返し断続させることで、「バッテリ電圧よりも高い電圧」を発生させるＤＤコンバータであり、昇圧した高電圧は大きな容量のコンデンサ１６にチャージされる。なお、この実施例のトランジスタは、全てスイッチング素子として用いるものである。   Note that the booster circuit 17 repeatedly “interrupts” the inductance 20 interposed between the power supply line Vdd of the battery and the ground (earth ground) with the booster transistor 21 at high speed, thereby generating a “voltage higher than the battery voltage”. This is a DD converter to be generated, and the boosted high voltage is charged to a capacitor 16 having a large capacity. Note that all the transistors of this embodiment are used as switching elements.

「バッテリ駆動手段」は、
・バッテリの電源ラインＶｄｄから電力供給ラインＣＯＭへバッテリ電圧を印加するバッテリ電圧制御用のトランジスタ２２と、
・電力供給ラインＣＯＭに生じさせた高電圧（高電圧制御用のトランジスタ１９の作動にともなう電圧）がバッテリの電源ラインＶｄｄへ導かれるのを防ぐ逆流防止用ダイオード２３と、
・バッテリ電圧制御用のトランジスタ２２のＯＦＦ時に調量弁３または減圧弁６に流れる電流を還流させる還流ダイオード２４と、
を備えて構成される。 "Battery drive means"
A battery voltage control transistor 22 for applying a battery voltage from the battery power line Vdd to the power supply line COM;
A backflow prevention diode 23 for preventing a high voltage generated in the power supply line COM (a voltage associated with the operation of the transistor 19 for high voltage control) from being led to the power supply line Vdd of the battery;
A recirculation diode 24 that recirculates a current flowing through the metering valve 3 or the pressure reducing valve 6 when the battery voltage control transistor 22 is OFF;
It is configured with.

調量弁３と減圧弁６は、電力供給ラインＣＯＭに対して並列接続されるものであり、調量弁３と減圧弁６の電流供給側（電流上流側）には電気的結合部αが設けられている。
一方、調量弁３と減圧弁６の電流下流側（グランド側）は、電気的結合部βを介してグランドに接地するものであり、電気的結合部βとグランドの間には、電流検出用の抵抗体２５が介在されている。 The metering valve 3 and the pressure reducing valve 6 are connected in parallel to the power supply line COM, and an electrical coupling portion α is provided on the current supply side (current upstream side) of the metering valve 3 and the pressure reducing valve 6. Is provided.
On the other hand, the current downstream side (ground side) of the metering valve 3 and the pressure reducing valve 6 is grounded to the ground via the electrical coupling portion β, and current detection is performed between the electrical coupling portion β and the ground. A resistor 25 is interposed.

調量弁３がＯＮされる際はコモンレール圧を昇圧させる時であり、逆に、減圧弁６がＯＮされる際はコモンレール圧を下降させる時である。このため、ＥＣＵ９は、調量弁３と減圧弁６を同時にＯＮする指示信号を与えない。   When the metering valve 3 is turned on, the common rail pressure is increased. Conversely, when the pressure reducing valve 6 is turned on, the common rail pressure is decreased. For this reason, the ECU 9 does not give an instruction signal for simultaneously turning on the metering valve 3 and the pressure reducing valve 6.

そこで、図１（ａ）に示すように、「高圧ポンプ２の調量弁３」と「コモンレール４の減圧弁６」は、選択して駆動される。
具体的に、
・調量弁３と電気的結合部βとの間には、調量弁３の作動を選択する調量弁用のトランジスタ２６が介在され、
・減圧弁６と電気的結合部βとの間には、減圧弁６の作動を選択する減圧弁用のトランジスタ２７が介在されている。 Therefore, as shown in FIG. 1A, “the metering valve 3 of the high-pressure pump 2” and “the pressure reducing valve 6 of the common rail 4” are selected and driven.
Specifically,
A metering valve transistor 26 for selecting the operation of the metering valve 3 is interposed between the metering valve 3 and the electrical coupling part β.
A pressure reducing valve transistor 27 for selecting the operation of the pressure reducing valve 6 is interposed between the pressure reducing valve 6 and the electrical coupling portion β.

そして、
・調量弁用のトランジスタ２６がＯＮされた状態で、「コンデンサ放電駆動手段」および「バッテリ駆動手段」から電力供給ラインＣＯＭへ「高電圧」および「バッテリの制御電圧」が印加されることで、調量弁３が作動し、
・減圧弁用のトランジスタ２７がＯＮされた状態で、「コンデンサ放電駆動手段」および「バッテリ駆動手段」から電力供給ラインＣＯＭへ「高電圧」および「バッテリの制御電圧」が印加されることで、減圧弁６が作動する。 And
By applying “high voltage” and “battery control voltage” from the “capacitor discharge driving means” and the “battery driving means” to the power supply line COM with the transistor 26 for the metering valve being turned on. The metering valve 3 is activated,
By applying “high voltage” and “battery control voltage” from the “capacitor discharge driving means” and the “battery driving means” to the power supply line COM with the transistor 27 for the pressure reducing valve being turned on, The pressure reducing valve 6 operates.

次に、図４を参照して、調量弁３および減圧弁６に与えられる駆動電流の波形を説明する。
なお、
・図中の実線Ｄはコンデンサ１６の電圧を示し、
・図中の実線Ｅは調量弁３および減圧弁６の駆動電圧を示し、
・図中の実線Ｆは調量弁３および減圧弁６の駆動電流を示し、
・中の実線Ｇは調量弁３または減圧弁６の駆動信号（選択信号）を示すものである。 Next, with reference to FIG. 4, the waveform of the drive current given to the metering valve 3 and the pressure reducing valve 6 will be described.
In addition,
The solid line D in the figure indicates the voltage of the capacitor 16,
-The solid line E in the figure indicates the driving voltage of the metering valve 3 and the pressure reducing valve 6,
The solid line F in the figure shows the drive currents of the metering valve 3 and the pressure reducing valve 6,
The solid line G in the middle indicates a drive signal (selection signal) for the metering valve 3 or the pressure reducing valve 6.

調量弁３または減圧弁６を作動させる際、駆動信号（実線Ｇ参照）によって「調量弁用のトランジスタ２６」または「減圧弁用のトランジスタ２７」の一方がＯＮされる。
そして、先ず、「高電圧制御用のトランジスタ１９」が一時的にＯＮされる。これにより、実線Ｅ、Ｆに示すように、コンデンサ１６にチャージした大電力エネルギー（高電圧、高電流）が電力供給ラインＣＯＭを介して調量弁３または減圧弁６に供給される。これにより、駆動信号により選択された調量弁３または減圧弁６の作動応答性が向上する。 When the metering valve 3 or the pressure reducing valve 6 is operated, one of the “metering valve transistor 26” and the “pressure reducing transistor 27” is turned on by the drive signal (see the solid line G).
First, the “high voltage control transistor 19” is temporarily turned on. Thereby, as shown by the solid lines E and F, the large power energy (high voltage and high current) charged in the capacitor 16 is supplied to the metering valve 3 or the pressure reducing valve 6 through the power supply line COM. Thereby, the operation responsiveness of the metering valve 3 or the pressure reducing valve 6 selected by the drive signal is improved.

続いて、「高電圧制御用のトランジスタ１９」が一時的にＯＮした後、実線Ｅに示すように、「バッテリ電圧制御用のトランジスタ２２」をデューティ比制御して、バッテリの電源ラインＶｄｄから電力供給ラインＣＯＭへ所定の定電流（電磁アクチュエータ駆動用の第１駆動電流Ｆ１、あるいはそれよりも低い電磁アクチュエータの作動保持用の第２駆動電流Ｆ２）を供給する。これにより、駆動信号により選択された調量弁３または減圧弁６が作動する。   Subsequently, after the “high-voltage control transistor 19” is temporarily turned on, as shown by the solid line E, the “battery voltage control transistor 22” is duty-controlled and the power is supplied from the battery power line Vdd. A predetermined constant current (a first drive current F1 for driving the electromagnetic actuator or a second drive current F2 for holding the operation of the electromagnetic actuator lower than that) is supplied to the supply line COM. Thereby, the metering valve 3 or the pressure reducing valve 6 selected by the drive signal is operated.

ここで、図１（ｂ）における地絡箇所Ｘに示すように、調量弁３の電流下流側が何らかの不具合により地絡した場合（具体的には、調量弁３とトランジスタ２６の間がグランドに電気的に触れた場合）、「減圧弁６を作動」させるべく減圧弁６に駆動電流を付与すると、調量弁３と減圧弁６の両方に駆動電流が流れてしまい、減圧弁６の作動時に、意図せずに高圧ポンプ２も作動してしまう。   Here, as shown in the ground fault location X in FIG. 1B, when the current downstream side of the metering valve 3 is grounded due to some trouble (specifically, the ground between the metering valve 3 and the transistor 26 is grounded). If the drive current is applied to the pressure reducing valve 6 to “activate the pressure reducing valve 6”, the drive current flows through both the metering valve 3 and the pressure reducing valve 6. During the operation, the high-pressure pump 2 is also operated unintentionally.

そこで、この実施例の燃料供給装置は、
・調量弁３と減圧弁６への電流供給側（電力供給ラインＣＯＭ）の電圧を検出する供給電圧検出手段２８と、
・調量弁３と減圧弁６の両方の選択が成されていない状態（「調量弁用のトランジスタ２６」と「減圧弁用のトランジスタ２７」の両方がＯＦＦした状態）で、調量弁３と減圧弁６への電流供給側に所定電圧（グランド電圧とバッテリ電圧との中間の電圧：数Ｖ：図５の実線Ｈ参照）を印加する地絡検出用電圧発生手段と、
・調量弁３と減圧弁６への電流供給側に所定電圧を発生させ、供給電圧検出手段２８によって検出される電圧が略グランド電圧（略０Ｖ）の場合に、「調量弁３の電流下流側の地絡」を判定する地絡判定手段と、
を備える。
なお、地絡判定手段は、ＥＣＵ９に設けられた制御プログラムである。 Therefore, the fuel supply device of this embodiment is
A supply voltage detection means 28 for detecting the voltage on the current supply side (power supply line COM) to the metering valve 3 and the pressure reducing valve 6;
The metering valve in a state where both the metering valve 3 and the pressure reducing valve 6 are not selected (“the metering valve transistor 26” and “the pressure reducing valve transistor 27” are both OFF). 3 and a ground fault detection voltage generating means for applying a predetermined voltage (a voltage intermediate between the ground voltage and the battery voltage: several V: see solid line H in FIG. 5) to the current supply side to 3 and the pressure reducing valve 6;
When a predetermined voltage is generated on the current supply side to the metering valve 3 and the pressure reducing valve 6 and the voltage detected by the supply voltage detecting means 28 is approximately ground voltage (approximately 0 V), “current of the metering valve 3” A ground fault determination means for determining a `` downstream ground fault '';
Is provided.
The ground fault determination means is a control program provided in the ECU 9.

供給電圧検出手段２８は、電力供給ラインＣＯＭとグランドとの間に介在された２つの抵抗２８ａ、２８ｂ間の分圧値に基づいて調量弁３と減圧弁６への電流供給側（電力供給ラインＣＯＭ）の電圧を検出するものである。
なお、図５の実線Ｈは、供給電圧検出手段２８によって検出される調量弁３と減圧弁６の上流側の電圧を示す。 The supply voltage detection means 28 is a current supply side (power supply) to the metering valve 3 and the pressure reducing valve 6 based on the divided value between the two resistors 28a and 28b interposed between the power supply line COM and the ground. The voltage of the line COM) is detected.
A solid line H in FIG. 5 indicates the upstream voltage of the metering valve 3 and the pressure reducing valve 6 detected by the supply voltage detecting means 28.

地絡検出用電圧発生手段は、地絡診断を実施する条件が成立し、且つ「調量弁用のトランジスタ２６」と「減圧弁用のトランジスタ２７」の両方をＯＦＦする状態（図５の地絡検出エリアＴ参照）の時に、電力供給ラインＣＯＭ（調量弁３と減圧弁６への電流供給側）に所定電圧（数Ｖ）を発生させるものである。   The ground fault detection voltage generating means is in a state in which a condition for performing the ground fault diagnosis is satisfied and both the “metering valve transistor 26” and the “pressure reducing valve transistor 27” are turned off (the ground in FIG. 5). At the time of the contact detection area T), a predetermined voltage (several V) is generated on the power supply line COM (current supply side to the metering valve 3 and the pressure reducing valve 6).

電力供給ラインＣＯＭに所定電圧（数Ｖ）を発生させる手段は、限定するものではなく、種々採用可能なものであり、例えば、
・「バッテリ電圧制御用のトランジスタ２２」のゲート電圧をコントロールしてバッテリ電圧を減圧した所定電圧（数Ｖ）を電力供給ラインＣＯＭに発生させるものであっても良いし、
・バッテリ電圧を「分圧抵抗」で減圧した所定電圧（数Ｖ）をスイッチ手段を介して電力供給ラインＣＯＭに発生させるものであっても良い。 The means for generating the predetermined voltage (several V) in the power supply line COM is not limited and can be variously adopted.
The gate voltage of the “battery voltage control transistor 22” may be controlled to generate a predetermined voltage (several V) by reducing the battery voltage in the power supply line COM.
A predetermined voltage (several V) obtained by reducing the battery voltage with a “voltage dividing resistor” may be generated in the power supply line COM via the switch means.

次に、この実施例における地絡診断の制御例を、図６のフローチャートを参照して説明する。
地絡診断を実施する条件が成立し、且つ「調量弁用のトランジスタ２６」と「減圧弁用のトランジスタ２７」の両方がＯＦＦ状態になると、地絡診断を開始し、調量弁３と減圧弁６への電流供給側（電力供給ラインＣＯＭ）に所定電圧を発生させる（ステップＳ１）。
続いて、供給電圧検出手段２８によって検出された電圧が略グランド電圧（略０Ｖ）であるか否かに基づいて、地絡が検出された否かを判定する（ステップＳ２）。 Next, a control example of ground fault diagnosis in this embodiment will be described with reference to the flowchart of FIG.
When the condition for executing the ground fault diagnosis is established and both the “metering valve transistor 26” and the “pressure reducing valve transistor 27” are in the OFF state, the ground fault diagnosis is started. A predetermined voltage is generated on the current supply side (power supply line COM) to the pressure reducing valve 6 (step S1).
Subsequently, it is determined whether or not a ground fault has been detected based on whether or not the voltage detected by the supply voltage detecting means 28 is approximately ground voltage (approximately 0V) (step S2).

このステップＳ２の判断結果がＹＥＳの場合は、「調量弁３の電流下流側の地絡」が発生していると判断し、減圧弁６の通電を即時に停止する（ステップＳ３）。
この実施例における「減圧弁６の通電停止」は、「減圧弁６の通電を完全に停止」するものではなく、「高圧ポンプ２が作動しない範囲」で「減圧弁６を作動」させるものであり、
（１）高圧ポンプ２が燃料を吐出しない通電長まで、減圧弁６の通電期間を制限するものであっても良いし、
（２）高圧ポンプ２が燃料を吐出しないポンプタイミング（高圧ポンプ２におけるプランジャ１２の下降領域）に、減圧弁６の作動タイミングを変更するものであっても良い。 If the determination result in step S2 is YES, it is determined that a “ground fault on the current downstream side of the metering valve 3” has occurred, and energization of the pressure reducing valve 6 is immediately stopped (step S3).
The “energization stop of the pressure reducing valve 6” in this embodiment does not “completely stop the energization of the pressure reducing valve 6” but “activates the pressure reducing valve 6” in the “range where the high pressure pump 2 does not operate”. Yes,
(1) The energization period of the pressure reducing valve 6 may be limited until the energization length at which the high-pressure pump 2 does not discharge fuel,
(2) The operation timing of the pressure reducing valve 6 may be changed to a pump timing at which the high-pressure pump 2 does not discharge fuel (a descending region of the plunger 12 in the high-pressure pump 2).

続いて、上記の地絡検出の回数（ステップＳ２のＹＥＳの判定回数）をカウントアップする（ステップＳ４）。
そして、地絡検出の回数（連続する回数であっても良いし、分断して発生した回数であっても良い）が、予め設定した所定回数（１０回や２０回など）に達したか否かを判断する（ステップＳ５）。 Subsequently, the number of times of detecting the above-mentioned ground fault (the number of determinations of YES in step S2) is counted up (step S4).
Whether or not the number of times of ground fault detection (which may be a continuous number of times or a number of times generated by dividing) has reached a predetermined number of times (such as 10 times or 20 times) set in advance. Is determined (step S5).

このステップＳ５の判断結果がＮＯの場合は、地絡の頻度が小さいと判断し、この地絡診断のルーチンを終了する（ステップＳ６）。
上記ステップＳ５の判断結果がＹＥＳの場合は、地絡の頻度が大きいと判断し、地絡故障を確定する（ステップＳ７）。なお、地絡故障が確定した場合の一例としては、乗員の視認範囲に設けられたモニターによって故障表示を実施して、乗員に故障が発生している旨を表示する。
その後、ステップＳ６へ進み、この地絡診断のルーチンを終了する。 If the determination result in step S5 is NO, it is determined that the frequency of ground faults is low, and the ground fault diagnosis routine is terminated (step S6).
If the determination result in step S5 is YES, it is determined that the frequency of ground faults is high, and a ground fault is determined (step S7). In addition, as an example when the ground fault is confirmed, the failure display is performed by the monitor provided in the occupant's viewing range, and the fact that the failure has occurred is displayed to the occupant.
Thereafter, the process proceeds to step S6, and the ground fault diagnosis routine is terminated.

一方、上述したステップＳ２の判断結果がＮＯの場合は、「調量弁３の電流下流側の地絡」が発生していないと判断し、減圧弁６の通電禁止を解除する（ステップＳ８）。
その後、ステップＳ６へ進み、この地絡診断のルーチンを終了する。 On the other hand, if the determination result in step S2 is NO, it is determined that the “ground fault on the current downstream side of the metering valve 3” has not occurred, and the energization prohibition of the pressure reducing valve 6 is canceled (step S8). .
Thereafter, the process proceeds to step S6, and the ground fault diagnosis routine is terminated.

（実施例の効果１）
この実施例の燃料噴射装置は、上述したように、調量弁３と減圧弁６の両方の選択が成されていない状態で、調量弁３と減圧弁６への電流供給側に所定電圧を印加しても、電圧が略グランド電圧に低下する際は、「調量弁３の電流下流側の地絡」を判定する。
そして、「調量弁３の電流下流側の地絡」を判定した場合は、減圧弁６を通電停止する。このように、減圧弁６を通電しないため、「高圧ポンプ２が意図せずに作動」することがない。
このため、「高圧ポンプ２が意図せずに作動」する不具合（コモンレール圧が加わる部品や部材に設計値を超えた過大な負荷が加わる不具合）を回避することができる。 (Effect 1 of an Example)
As described above, the fuel injection device of this embodiment has a predetermined voltage on the current supply side to the metering valve 3 and the pressure reducing valve 6 in a state where both the metering valve 3 and the pressure reducing valve 6 are not selected. When the voltage drops to substantially the ground voltage even when is applied, “ground fault on the current downstream side of the metering valve 3” is determined.
When the “ground fault on the current downstream side of the metering valve 3” is determined, the pressure reducing valve 6 is deenergized. Thus, since the pressure reducing valve 6 is not energized, the “high pressure pump 2 does not operate unintentionally”.
For this reason, it is possible to avoid the problem that “the high pressure pump 2 operates unintentionally” (the problem that an excessive load exceeding the design value is applied to the parts and members to which the common rail pressure is applied).

（実施例の効果２）
「調量弁３の電流下流側の地絡」を判定した際における「減圧弁６の通電停止」は、
（１）高圧ポンプ２が燃料を吐出しない通電長まで、減圧弁６の通電期間を制限するもの、
（２）あるいは、高圧ポンプ２が燃料を吐出しないポンプタイミング（高圧ポンプ２におけるプランジャ１２の下降領域）に減圧弁６の作動タイミングを変更するものである。
このように、「減圧弁６の通電を完全に停止」するものではなく、「高圧ポンプ２が作動しない範囲」で「減圧弁６を作動」させるため、コモンレール４に蓄圧された燃料の一部を減圧弁６によって溢流させることができ、実レール圧の減圧を実施できる。 (Effect 2 of Example)
When “the ground fault on the current downstream side of the metering valve 3” is determined, “the energization stop of the pressure reducing valve 6”
(1) Limiting the energization period of the pressure reducing valve 6 until the energization length at which the high-pressure pump 2 does not discharge fuel,
(2) Alternatively, the operation timing of the pressure reducing valve 6 is changed to a pump timing at which the high-pressure pump 2 does not discharge fuel (a descending region of the plunger 12 in the high-pressure pump 2).
In this way, a part of the fuel accumulated in the common rail 4 is not used in order to “activate the pressure reducing valve 6” in the “range in which the high pressure pump 2 does not operate” rather than “stop energization of the pressure reducing valve 6 completely”. Can be overflowed by the pressure reducing valve 6, and the actual rail pressure can be reduced.

（実施例の効果３）
ここで、図１（ｃ）における地絡箇所Ｘに示すように、調量弁３の電流下流側が何らかの不具合により地絡した状態で、「調量弁３を作動」させるべく調量弁３に駆動電流を付与した場合、電流検出用の抵抗体２５の検出電流が０（ゼロ）になる。
この状態で調量弁３を作動させる場合、従来技術では、ＥＣＵ９が調量弁３の駆動電流を増加させるべく、「バッテリ電圧制御用のトランジスタ２２」のデューティ比を高める。その結果、図７の実線Ｉに示すように、調量弁３に付与される駆動電流が、正常時（破線Ｆ参照）に比較して大きくなってしまう。 (Effect 3 of Example)
Here, as shown in the ground fault location X in FIG. 1 (c), the metering valve 3 is set to “activate the metering valve 3” in a state where the current downstream side of the metering valve 3 is grounded due to some trouble. When the drive current is applied, the detection current of the current detection resistor 25 becomes 0 (zero).
When the metering valve 3 is operated in this state, in the prior art, the ECU 9 increases the duty ratio of the “battery voltage control transistor 22” in order to increase the drive current of the metering valve 3. As a result, as shown by the solid line I in FIG. 7, the drive current applied to the metering valve 3 becomes larger than that at the normal time (see the broken line F).

これに対し、この実施例の地絡判定手段は、調量弁３を通電させた際に、電流検出用の抵抗体２５の検出電流において「調量弁３の電流下流側に電流が流れていない場合」は、「調量弁３の電流下流側の地絡」を識別するように設けられる。
このように、「調量弁３の電流下流側の地絡」を識別できるため、従来技術とは異なり、調量弁３に供給する駆動電流を制限することができる。これにより、調量弁３に供給する駆動電流が、正常時（破線Ｆ参照）に比較して大きくなる不具合を回避することができる。 On the other hand, when the metering valve 3 is energized, the ground fault determination means of this embodiment indicates that “current is flowing downstream from the metering valve 3 in the current detected by the resistor 25 for current detection. “If not” is provided to identify “ground fault on the current downstream side of the metering valve 3”.
Thus, since “the ground fault on the current downstream side of the metering valve 3” can be identified, the driving current supplied to the metering valve 3 can be limited unlike the prior art. As a result, it is possible to avoid a problem that the drive current supplied to the metering valve 3 becomes larger than that at normal time (see the broken line F).

（実施例の効果４）
この実施例の燃料噴射装置は、調量弁３と減圧弁６の両方の選択が成されていない状態で、調量弁３と減圧弁６への電流供給側に所定電圧（数Ｖ）を印加した際に、上記とは逆に、調量弁３と減圧弁６への電流供給側の「電圧が上昇」した場合（バッテリ電圧が検出された場合）、「バッテリショート（「バッテリの電源ラインＶｄｄ」と「電力供給ラインＣＯＭ」の短絡）」を判定することができる。 (Effect 4 of Example)
The fuel injection device of this embodiment applies a predetermined voltage (several V) to the current supply side to the metering valve 3 and the pressure reducing valve 6 in a state where both the metering valve 3 and the pressure reducing valve 6 are not selected. Contrary to the above, when the voltage is increased on the current supply side to the metering valve 3 and the pressure reducing valve 6 when the voltage is applied (when the battery voltage is detected), “battery short (“ battery power ” Line Vdd "and" power supply line COM "short circuit)".

上記では、実施例の複雑化を回避する目的で、「減圧弁６」と「選択駆動される１つの調量弁３」のみを開示したが、複数の調圧弁（他の高圧ポンプの調量弁）を搭載するものであっても良い。
その場合、上述した調量弁３とは異なる他の調量弁（他の調量弁）が、上述した調量弁３とは独立して作動制御されるものである。 In the above, for the purpose of avoiding complication of the embodiment, only “the pressure reducing valve 6” and “one metering valve 3 to be selectively driven” are disclosed, but a plurality of pressure regulating valves (metering of other high pressure pumps) are disclosed. Valve) may be mounted.
In this case, another metering valve (other metering valve) different from the metering valve 3 described above is operated and controlled independently of the metering valve 3 described above.

２ 高圧ポンプ
３ 調量弁
４ コモンレール
６ 減圧弁
８ 制御装置
２８ 供給電圧検出手段 2 High-pressure pump 3 Metering valve 4 Common rail 6 Pressure reducing valve 8 Control device 28 Supply voltage detection means

Claims (5)

高圧燃料を吐出する高圧ポンプ（２）において燃料の吐出量を調量する調量弁（３）と、
前記高圧ポンプ（２）の吐出した燃料を蓄圧するコモンレール（４）において蓄圧燃料を減圧する減圧弁（６）と、
を選択して駆動する制御装置（８）を有する燃料噴射装置において、
前記制御装置（８）は、
前記調量弁（３）と前記減圧弁（６）への電流供給側の電圧を検出する供給電圧検出手段（２８）と、
前記調量弁（３）と前記減圧弁（６）の両方の選択が成されていない状態で、前記調量弁（３）と前記減圧弁（６）への電流供給側に所定電圧を印加しても、前記調量弁（３）と前記減圧弁（６）への電流供給側の検出電圧が略グランド電圧に低下する時に、前記調量弁（３）の電流下流側の地絡を判定する地絡判定手段と、
を具備することを特徴とする燃料噴射装置。 A metering valve (3) for metering the amount of fuel discharged in the high-pressure pump (2) for discharging high-pressure fuel;
A pressure reducing valve (6) for depressurizing the accumulated fuel in the common rail (4) for accumulating the fuel discharged from the high pressure pump (2);
In a fuel injection device having a control device (8) for selecting and driving
The control device (8)
Supply voltage detecting means (28) for detecting a voltage on the current supply side to the metering valve (3) and the pressure reducing valve (6);
A predetermined voltage is applied to the current supply side to the metering valve (3) and the pressure reducing valve (6) in a state where both the metering valve (3) and the pressure reducing valve (6) are not selected. Even when the detected voltage on the current supply side to the metering valve (3) and the pressure reducing valve (6) drops to a substantially ground voltage, the ground fault on the current downstream side of the metering valve (3) is reduced. A ground fault judging means for judging;
A fuel injection device comprising: 請求項１に記載の燃料噴射装置において、
前記制御装置（８）は、前記調量弁（３）の電流下流側の地絡を判定した場合、前記減圧弁（６）を通電停止することを特徴とする燃料噴射装置。 The fuel injection device according to claim 1,
The said control apparatus (8) stops energizing the said pressure reduction valve (6), when the ground fault of the electric current downstream side of the said metering valve (3) is determined, The fuel injection apparatus characterized by the above-mentioned. 請求項２に記載の燃料噴射装置において、
前記減圧弁（６）の通電停止は、前記高圧ポンプ（２）が燃料を吐出しない通電長まで、前記減圧弁（６）の通電期間を制限することを特徴とする燃料噴射装置。 The fuel injection device according to claim 2, wherein
Stopping energization of the pressure reducing valve (6) limits the energization period of the pressure reducing valve (6) until the energization length at which the high pressure pump (2) does not discharge fuel. 請求項２に記載の燃料噴射装置において、
前記減圧弁（６）の通電停止は、前記高圧ポンプ（２）が燃料を吐出しないポンプタイミングに、前記減圧弁（６）の作動タイミングを変更することを特徴とする燃料噴射装置。 The fuel injection device according to claim 2, wherein
Stopping energization of the pressure reducing valve (6) changes the operation timing of the pressure reducing valve (6) to a pump timing at which the high pressure pump (2) does not discharge fuel. 請求項１〜請求項４のいずれか１つに記載の燃料噴射装置において、
前記地絡判定手段は、前記調量弁（３）を通電させた際に、前記調量弁（３）の電流下流側に電流が流れていない場合に、前記調量弁（３）の電流下流側の地絡を識別することを特徴とする燃料噴射装置。 In the fuel injection device according to any one of claims 1 to 4,
The ground fault determination means is configured such that when the metering valve (3) is energized, if no current flows downstream of the metering valve (3), the current of the metering valve (3) A fuel injection device for identifying a ground fault on the downstream side.
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