JP4700172B2 - In particular, a method for diagnosing a fuel supply system of an internal combustion engine of an automobile - Google Patents

In particular, a method for diagnosing a fuel supply system of an internal combustion engine of an automobile Download PDF

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Publication number
JP4700172B2
JP4700172B2 JP2000212795A JP2000212795A JP4700172B2 JP 4700172 B2 JP4700172 B2 JP 4700172B2 JP 2000212795 A JP2000212795 A JP 2000212795A JP 2000212795 A JP2000212795 A JP 2000212795A JP 4700172 B2 JP4700172 B2 JP 4700172B2
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Prior art keywords
fuel
pressure
supply system
distribution pipe
fuel supply
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JP2001041133A (en
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ラウフェンベルク クサーファー
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Robert Bosch GmbH
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Robert Bosch GmbH
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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
    • 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
    • F02D2041/224—Diagnosis of the fuel system
    • 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
    • F02D41/3854—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped with elements in the low pressure part, e.g. low pressure pump

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  • 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)
  • Fuel-Injection Apparatus (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Testing Of Engines (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、燃料が噴射弁を介して直接燃焼室に噴射可能である、特に自動車の内燃機関の燃料供給系を診断する方法に関する。また、本発明は、この方法を実施するために構成された自己診断装置および外部診断装置にも関する。
【０００２】
【従来の技術】
電子式の噴射装置を備えたオットーエンジンでは、約３バールから約１０バールの燃料圧が必要である。この燃料圧は電動燃料ポンプによって形成され、機械式の圧力制御装置によって制御して使用される。燃料直接噴射装置を備えたオットーエンジンでも、この燃料圧は高圧ポンプのための前搬送圧として必要である。
【０００３】
公知の、電子式の噴射装置を備えたオットーエンジンでは、前搬送圧の電子式の監視または電子式の制御が行われないので、制御装置または工場試験器による前搬送圧の診断は不可能である。
【０００４】
直接噴射型のオットーエンジンでは、前搬送圧は、実質的に高圧ポンプへ供給するためにだけに必要である。この場合前搬送圧には高い要求が課せられない。なぜならば、この前搬送圧は、高圧を発生可能にするためにだけ存在すればよいからである。しかしながら直接噴射型のオットーエンジンでも、たとえばエンジン始動時のような、前搬送圧で運転する必要のある運転領域が存在する。このような理由に基づいて、直接噴射型のオットーエンジンでも、前搬送圧はエラーのない駆動のための重要なパラメータである。
【０００５】
【発明が解決しようとする課題】
本発明の課題は、燃料直接噴射装置を備えた内燃機関の燃料供給系を診断する方法を改良して、前搬送圧を監視もしくは診断することができるような方法を提供することである。
【０００６】
【課題を解決するための手段】
この課題を解決するための本発明の方法によれば、内燃機関を、高圧圧送が行われない運転形式で運転し、燃料供給系の燃料分配管内の前搬送圧を、該燃料分配管に取り付けられた圧力センサを用いて検出するようにした。
【０００７】
【発明の効果】
本発明によれば、直接噴射型のオットーエンジンの各燃料供給系に必ず設けられている圧力センサが、前搬送圧を診断するために使用される。前搬送圧を診断するためにエンジンは、高圧圧送が行われない運転形式で運転しなければならない。
【０００８】
前搬送圧の診断に関して、直接噴射装置を備えたオットーエンジンにおける高圧制御装置のための２つの異なるコンセプトがある。しかしながらこれら両方のために、高圧圧送が行われない運転形式が存在するので、前搬送圧は、燃料分配管に取り付けられた圧力センサによって検出することができる。このようにして、燃料供給系内の前搬送圧は、エンジンに付加的な部材を取り付けて燃料供給系に係合させる（Montageeingriff）必要なしに診断することができる。
【０００９】
上記の、内燃機関の運転形式は、たとえば制御装置内で、この制御装置に接続される工場試験装置によって強制することができる。
【００１０】
その他の特徴、使用例および利点は、以下の、図面にて説明した発明の実施の形態によって明らかである。
【００１１】
【発明の実施の形態】
以下に本発明の実施の形態を図面を用いて具体的に説明する。
【００１２】
図１および図２は基本配置構成を示している。この基本配置構成は、付加的な弁および／または接続部材によって、たとえば冷却または排気のための特別な処置を実現するために様々な形式で拡張することができる。
【００１３】
図１に示した、圧力制御装置を備えた燃料供給系では、燃料つまりガソリンは、燃料タンク１から、機械式の圧力制御装置を有する電動燃料ポンプ２によって、前搬送圧で高圧ポンプ３に圧送される。この高圧ポンプ３から、燃料は、圧力センサ５を備えた燃料分配管（レール）４内に達し、この燃料分配管４から個々の燃料噴射弁７に達する。図１に示した圧力制御される燃料系では、圧力制御弁６を有する制御回路８によって、連続する燃料流が存在するように配慮される。この場合、噴射弁７を介して内燃機関の燃焼室に噴射される燃料量は、制御回路８の妨害要素（Stoergroesse）である。燃料分配管４内の圧力は、制御回路８を使用することで、燃料分配管４を通る燃料流の変化によって制御される。
【００１４】
本発明による、前搬送燃料系の診断方法を実施するために、図１に示した、圧力制御装置を備えた燃料供給系では、圧力制御弁６が完全に開放されている。
【００１５】
燃料供給系が負荷されていない場合、前搬送圧は始動装置の作動によって噴射弁の閉鎖状態において検出され診断される。
【００１６】
燃料供給系が負荷されている場合には、前搬送圧を診断するために、制御装置によって、噴射弁７の様々な噴射時間が設定される。
【００１７】
図２に示した、必要量制御装置（Bedarfssteuerung）を備えた燃料供給系では、燃料は、燃料タンク１から、機械式の圧力制御装置を備えた電動燃料ポンプ２によって、前搬送圧で、流量制御弁１３を備えた高圧ポンプ３に圧送される。流量制御弁１３によって、燃料分配管４には、噴射弁７による噴射のために必要である燃料量だけが圧送される。精密な調整を行う高圧制御装置（図示せず）が付加的に設けられていてもよい。高圧ポンプ３に流量制御弁１３を組み合わせることによって、噴射のために必要な燃料量を正確に配量して後搬送することができる。さらに、流量制御弁１３と燃料分配管４との間の燃料管路には逆止弁１０が設けられている。燃料分配管４には、図１に示した、圧力制御装置を備えた燃料供給系のように、圧力センサ５が設けられている。
【００１８】
前搬送圧を診断するために、図２に示した、必要量制御される燃料系では、先ず、燃料分配管４内に高圧が存在しないことを保証するために数回の噴射が噴射弁を介して行われる。高圧ポンプ３および流量制御弁１３の設計に応じて、流量制御弁１３は、診断するために、高圧搬送が行われないように制御しなければならない。この状態では、燃料分配管４は前搬送系を介してのみ電動燃料ポンプ２から燃料供給される。燃料供給系が負荷されていない場合、前搬送圧の診断は、始動装置によって噴射弁７の閉鎖状態において行われる。燃料供給系が負荷されている場合、前搬送圧の診断は、様々な噴射時間の設定によって行われる。
【００１９】
前搬送圧を自己診断するために、図１にも図２にも示していない制御装置が圧力センサ５に接続されており、この制御装置は圧力センサ５によって検出された、燃料分配管４内の圧力信号を受信する。制御装置は方法ステップを実行し、圧力センサ５から得られた圧力信号に基づいて前搬送圧を診断する。
【００２０】
外部診断、たとえば工場診断の場合には、図示していない制御装置に接続された工場診断装置（同様に図示せず）は、制御装置を強制的に、前搬送圧が圧力センサ５によって検出されるような運転状態にさせる。
【図面の簡単な説明】
【図１】特に自動車の内燃機関の、圧力制御装置を備えた燃料供給系を概略的に示すブロック回路図である。
【図２】特に自動車の内燃機関の、必要量制御装置を備えた燃料供給系を概略的に示すブロック回路図である。
【符号の説明】
１ 燃料タンク、 ２ 電動燃料ポンプ、 ３ 高圧ポンプ、 ４ 燃料分配管、 ５ 圧力センサ、 ６ 圧力制御弁、 ７ 燃料噴射弁、 ８ 制御回路、 １０ 逆止弁、 １３ 流量制御弁[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for diagnosing a fuel supply system of an internal combustion engine of an automobile, in which fuel can be directly injected into a combustion chamber via an injection valve. The present invention also relates to a self-diagnosis device and an external diagnosis device configured to carry out this method.
[0002]
[Prior art]
Otto engines with electronic injectors require fuel pressures of about 3 bar to about 10 bar. This fuel pressure is generated by an electric fuel pump, and is used by being controlled by a mechanical pressure control device. Even in an Otto engine equipped with a direct fuel injection device, this fuel pressure is necessary as a pre-conveying pressure for a high-pressure pump.
[0003]
The known Otto engine with an electronic injection device does not perform electronic monitoring or electronic control of the pre-conveying pressure, so it is impossible to diagnose the pre-conveying pressure by the control device or factory tester. is there.
[0004]
In a direct injection type Otto engine, the pre-conveyance pressure is only necessary to substantially supply the high pressure pump. In this case, a high demand is not imposed on the pre-conveying pressure. This is because the pre-conveying pressure only needs to be present so that a high pressure can be generated. However, even in a direct injection type Otto engine, there is an operation region in which it is necessary to operate at a pre-conveyance pressure, for example, when the engine is started. For this reason, even in a direct injection type Otto engine, the pre-conveyance pressure is an important parameter for error-free driving.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide an improved method for diagnosing a fuel supply system of an internal combustion engine equipped with a direct fuel injection device so that the pre-conveyance pressure can be monitored or diagnosed.
[0006]
[Means for Solving the Problems]
According to the method of the present invention for solving this problem, the internal combustion engine is operated in an operation mode in which high-pressure pumping is not performed, and the front conveyance pressure in the fuel distribution pipe of the fuel supply system is attached to the fuel distribution pipe. It was made to detect using the obtained pressure sensor.
[0007]
【The invention's effect】
According to the present invention, the pressure sensor that is always provided in each fuel supply system of the direct injection type Otto engine is used to diagnose the pre-conveyance pressure. In order to diagnose the pre-conveyance pressure, the engine must be operated in a mode of operation where high pressure pumping is not performed .
[0008]
There are two different concepts for high pressure control in an Otto engine with a direct injector for the diagnosis of the pre-conveyance pressure. However, for both of these, there is an operation mode in which high-pressure pumping is not performed, so that the pre-conveyance pressure can be detected by a pressure sensor attached to the fuel distribution pipe. In this way, the pre-conveying pressure in the fuel supply system can be diagnosed without the need to attach additional members to the engine and engage the fuel supply system (Montageeingriff).
[0009]
The above-described operation mode of the internal combustion engine can be forced by, for example, a factory test apparatus connected to the control apparatus in the control apparatus.
[0010]
Other features, usage examples, and advantages will be apparent from the following embodiments of the invention described with reference to the drawings.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings.
[0012]
1 and 2 show the basic arrangement configuration. This basic arrangement can be extended in various ways to realize special measures, for example for cooling or exhausting, by means of additional valves and / or connecting members.
[0013]
In the fuel supply system equipped with the pressure control device shown in FIG. 1, fuel, that is, gasoline, is pumped from the fuel tank 1 to the high-pressure pump 3 at the pre-conveyance pressure by the electric fuel pump 2 having a mechanical pressure control device. Is done. From this high-pressure pump 3, the fuel reaches a fuel distribution pipe (rail) 4 provided with a pressure sensor 5, and reaches each fuel injection valve 7 from this fuel distribution pipe 4. In the pressure-controlled fuel system shown in FIG. 1, the control circuit 8 having the pressure control valve 6 takes care that a continuous fuel flow exists. In this case, the amount of fuel injected into the combustion chamber of the internal combustion engine via the injection valve 7 is a disturbing element (Stoergroesse) of the control circuit 8. The pressure in the fuel distribution pipe 4 is controlled by the change of the fuel flow through the fuel distribution pipe 4 by using the control circuit 8.
[0014]
In order to carry out the diagnostic method for the pre-transport fuel system according to the present invention, the pressure control valve 6 is completely opened in the fuel supply system equipped with the pressure control device shown in FIG.
[0015]
When the fuel supply system is not loaded, the pre-conveyance pressure is detected and diagnosed in the closed state of the injection valve by the operation of the starter.
[0016]
When the fuel supply system is loaded, various injection times of the injection valve 7 are set by the control device in order to diagnose the pre-conveyance pressure.
[0017]
In the fuel supply system equipped with the required quantity control device (Bedarfssteuerung) shown in FIG. 2, the fuel is flowed from the fuel tank 1 by the electric fuel pump 2 equipped with a mechanical pressure control device at the pre-conveyance pressure. It is pumped to a high pressure pump 3 equipped with a control valve 13. Only the amount of fuel necessary for injection by the injection valve 7 is pumped to the fuel distribution pipe 4 by the flow control valve 13. A high-pressure control device (not shown) that performs precise adjustment may be additionally provided. By combining the flow control valve 13 with the high-pressure pump 3, the fuel amount required for injection can be accurately measured and conveyed afterwards. Further, a check valve 10 is provided in the fuel line between the flow control valve 13 and the fuel distribution pipe 4. The fuel distribution pipe 4 is provided with a pressure sensor 5 like the fuel supply system including the pressure control device shown in FIG.
[0018]
In order to diagnose the pre-conveying pressure, in the fuel system in which the required amount is controlled as shown in FIG. 2, first, several injections are performed to inject the injection valve in order to ensure that no high pressure exists in the fuel distribution pipe 4. Done through. Depending on the design of the high-pressure pump 3 and the flow control valve 13, the flow control valve 13 must be controlled so that high-pressure conveyance is not performed for diagnosis. In this state, the fuel distribution pipe 4 is supplied with fuel from the electric fuel pump 2 only through the front conveyance system. When the fuel supply system is not loaded, the pre-conveyance pressure is diagnosed in the closed state of the injection valve 7 by the starter. When the fuel supply system is loaded, the pre-conveyance pressure is diagnosed by setting various injection times.
[0019]
In order to make a self-diagnosis of the pre-conveyance pressure, a control device not shown in FIGS. 1 and 2 is connected to the pressure sensor 5, and this control device is detected in the fuel distribution pipe 4 by the pressure sensor 5. The pressure signal is received. The control device executes the method steps and diagnoses the pre-conveying pressure based on the pressure signal obtained from the pressure sensor 5.
[0020]
In the case of an external diagnosis, for example, a factory diagnosis, a factory diagnosis apparatus (also not shown) connected to a control apparatus (not shown) forces the control apparatus, and the front conveyance pressure is detected by the pressure sensor 5. To make it run like this.
[Brief description of the drawings]
FIG. 1 is a block circuit diagram schematically showing a fuel supply system equipped with a pressure control device, particularly for an internal combustion engine of an automobile.
FIG. 2 is a block circuit diagram schematically showing a fuel supply system equipped with a necessary amount control device, particularly for an internal combustion engine of an automobile.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fuel tank, 2 Electric fuel pump, 3 High pressure pump, 4 Fuel distribution pipe, 5 Pressure sensor, 6 Pressure control valve, 7 Fuel injection valve, 8 Control circuit, 10 Check valve, 13 Flow control valve

Claims (5)

燃料が噴射弁（７）を介して直接燃焼室に噴射可能である、内燃機関の燃料供給系の前搬送圧を診断する方法であって、
燃料ポンプ（２）から燃料を前搬送圧で高圧ポンプ（３）に圧送し、
該高圧ポンプ（３）から燃料を高圧で燃料分配管（４）に圧送し、
燃料分配管（４）から高圧の燃料を個々の噴射弁（７）に案内することで、燃料が噴射弁（７）を介して直接燃焼室に噴射される方法において、
診断時に、高圧ポンプ（３）から燃料が高圧で燃料分配管（４）に圧送されない、つまり燃料供給系が高圧の燃料による負荷をかけられていない場合には、始動装置の作動によって噴射弁（７）の閉鎖状態において燃料分配管（４）内の前搬送圧を、燃料分配管（４）に取り付けられた圧力センサ（５）を用いて検出し、
診断時に、高圧ポンプ（３）から燃料が高圧で燃料分配管（４）に圧送される、つまり、燃料供給系が高圧の燃料による負荷をかけられている場合には、噴射弁（７）を介して燃料を噴射して、燃料分配管（４）に作用する高圧を低下させて、燃料分配管（４）に燃料ポンプ（２）からの前搬送圧だけが作用するようにして、該前搬送圧を、該燃料分配管（４）に取り付けられた圧力センサ（５）を用いて検出することを特徴とする、内燃機関の燃料供給系の前搬送圧を診断する方法。A method for diagnosing a pre-conveyance pressure of a fuel supply system of an internal combustion engine, in which fuel can be directly injected into a combustion chamber via an injection valve (7),
The fuel is pumped from the fuel pump (2) to the high pressure pump (3) at the pre-conveyance pressure,
Fuel is pumped from the high-pressure pump (3) to the fuel distribution pipe (4) at a high pressure;
In a method in which fuel is injected directly into the combustion chamber via the injection valve (7) by guiding high pressure fuel from the fuel distribution pipe (4) to the individual injection valves (7),
At the time of diagnosis, when the fuel is not pumped from the high pressure pump (3) to the fuel distribution pipe (4), that is, when the fuel supply system is not loaded with the high pressure fuel, the injection valve ( In the closed state of 7), the front conveying pressure in the fuel distribution pipe (4) is detected using a pressure sensor (5) attached to the fuel distribution pipe (4),
At the time of diagnosis, when the fuel is pumped from the high pressure pump (3) to the fuel distribution pipe (4) at a high pressure, that is, when the fuel supply system is loaded with high pressure fuel, the injection valve (7) is by injecting fuel through, reduce the pressure acting on the fuel distribution pipe (4), the fuel distribution pipe (4) by carrying wafers pressure from the fuel pump (2) so as to act, the prior A method for diagnosing a pre-transport pressure of a fuel supply system of an internal combustion engine, wherein the transport pressure is detected by using a pressure sensor (5) attached to the fuel distribution pipe (4). 燃料供給系が圧力制御弁（６）を有しており、該圧力制御弁（６）によって燃料の圧力が制御される燃料供給系の前搬送圧を診断するために、前記圧力制御弁（６）を完全に開放する、請求項１記載の方法。  The fuel supply system has a pressure control valve (6), and the pressure control valve (6) is used to diagnose the pre-conveyance pressure of the fuel supply system in which the pressure of the fuel is controlled by the pressure control valve (6). 2. The method according to claim 1, wherein: 燃料供給系が流量制御弁（１３）を有しており、該流量制御弁（１３）によって噴射弁（７）による噴射に必要な燃料量に制御される燃料供給系の前搬送圧を診断するために、流量制御弁（１３）を調節して、高圧ポンプ（３）による高圧圧送が行われないようにし、燃料分配管（４）に燃料ポンプ（２）からの前搬送圧だけが作用するようにする、請求項１記載の方法。The fuel supply system has a flow control valve (13), and the flow control valve (13) diagnoses the pre-conveyance pressure of the fuel supply system controlled to the amount of fuel required for injection by the injection valve (7). for, by adjusting the flow quantity control valve (13), so is not performed high pressure pumped by the high-pressure pump (3), the fuel distribution pipe (4) by carrying wafers pressure from the fuel pump (2) is so as to act, the process of claim 1. 燃料が直接燃焼室に噴射可能である、内燃機関の燃料供給系の前搬送圧を自己診断する装置において、
燃料分配管（４）内の圧力を検出する圧力センサ（５）が、中央制御装置に接続されており、該中央制御装置は請求項１から３記載の方法を実施するために適していることを特徴とする、内燃機関の燃料供給系の前搬送圧を自己診断する装置。In an apparatus for self-diagnosis of a pre-conveyance pressure of a fuel supply system of an internal combustion engine, in which fuel can be directly injected into a combustion chamber
A pressure sensor (5) for detecting the pressure in the fuel distribution pipe (4) is connected to the central control device, which is suitable for carrying out the method according to claims 1 to 3 An apparatus for self-diagnosis of a pre-conveyance pressure of a fuel supply system of an internal combustion engine. 燃料が直接燃焼室に噴射可能である、自動車の燃料供給系の前搬送圧を外部診断する装置において、
燃料分配管（４）内の圧力を検出する圧力センサ（５）が、中央制御装置に接続されており、該中央制御装置は請求項１から３記載の方法を実施するために適しており、外部診断装置が、高圧への圧力上昇が行われない内燃機関の運転形式を、中央制御装置を介して強制することを特徴とする、自動車の燃料供給系の前搬送圧を、外部診断するための装置。In an apparatus for externally diagnosing the front conveyance pressure of a fuel supply system of an automobile, in which fuel can be directly injected into a combustion chamber,
A pressure sensor (5) for detecting the pressure in the fuel distribution pipe (4) is connected to the central control device, which is suitable for carrying out the method according to claims 1 to 3 , To externally diagnose the pre-conveyance pressure of the fuel supply system of an automobile, characterized in that the external diagnostic device forces the operation mode of the internal combustion engine in which no pressure increase to a high pressure is performed through the central controller Equipment.
JP2000212795A 1999-07-15 2000-07-13 In particular, a method for diagnosing a fuel supply system of an internal combustion engine of an automobile Expired - Fee Related JP4700172B2 (en)

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