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JP5212400B2 - Pressure detection device - Google Patents

Pressure detection device Download PDF

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JP5212400B2
JP5212400B2 JP2010037384A JP2010037384A JP5212400B2 JP 5212400 B2 JP5212400 B2 JP 5212400B2 JP 2010037384 A JP2010037384 A JP 2010037384A JP 2010037384 A JP2010037384 A JP 2010037384A JP 5212400 B2 JP5212400 B2 JP 5212400B2
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pressure
pressure sensor
fuel
transmission time
output signal
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JP2010266426A (en
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周 各務
淳 近藤
友基 藤野
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Denso Corp
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Denso Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/24—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Measuring Fluid Pressure (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

本発明は、流体の圧力を検出する圧力検出装置に関し、特に内燃機関に燃料を噴射する燃料噴射装置に用いる圧力検出装置として好適である。   The present invention relates to a pressure detection device that detects the pressure of a fluid, and is particularly suitable as a pressure detection device used in a fuel injection device that injects fuel into an internal combustion engine.

従来の内燃機関用燃料噴射装置は、燃料の圧力に応じた電気信号を出力する圧力センサを備え、その圧力センサの出力信号に基づいて燃料の圧力を推定するようになっている（例えば、特許文献１参照）。   A conventional fuel injection device for an internal combustion engine includes a pressure sensor that outputs an electric signal corresponding to the pressure of the fuel, and estimates the fuel pressure based on the output signal of the pressure sensor (for example, a patent) Reference 1).

国際公開第０２／０８６３０２号パンフレットInternational Publication No. 02/086302 Pamphlet

しかしながら、圧力センサはセンサ温度により出力値が変化するので圧力検出の誤差が発生する。また、ものの作りこみおよび調整により温度による出力値の変化を少なくする場合は、コストが高くなってしまうという問題が発生する。   However, since the output value of the pressure sensor changes depending on the sensor temperature, an error in pressure detection occurs. Further, when the change of the output value due to temperature is reduced by making and adjusting the product, there arises a problem that the cost becomes high.

本発明は上記点に鑑みて、配管内を流れる流体の圧力を、温度に係わらず正確に検出可能にすることを目的とする。   The present invention has been made in view of the above points, and an object of the present invention is to make it possible to accurately detect the pressure of a fluid flowing in a pipe regardless of the temperature.

上記目的を達成するため、請求項１に記載の発明では、配管（４）内を流れる流体の圧力に応じた電気信号を出力する第１圧力センサ（５）と、この第１圧力センサ（５）よりも流体流れ下流側に配置されて、流体の圧力に応じた電気信号を出力する第２圧力センサ（６）と、第１圧力センサ（５）の出力信号および第２圧力センサ（６）の出力信号のうちの少なくとも一方に基づいて流体の圧力を算出する圧力算出手段（１１０）と、第１圧力センサ（５）の出力信号および第２圧力センサ（６）の出力信号に基づいて、流体の圧力脈動が第１圧力センサ（５）の位置と第２圧力センサ（６）の位置との間を伝達するのに要した伝達時間を算出する伝達時間算出手段（１２０）と、この伝達時間算出手段（１２０）にて算出した伝達時間に基づいて、圧力算出手段（１１０）にて算出した流体の圧力の算出値を補正する補正手段（１３０）とを備えることを特徴とする。   In order to achieve the above object, according to the first aspect of the present invention, a first pressure sensor (5) for outputting an electrical signal corresponding to the pressure of a fluid flowing in the pipe (4), and the first pressure sensor (5 ) And a second pressure sensor (6) that outputs an electrical signal corresponding to the pressure of the fluid, and an output signal of the first pressure sensor (5) and the second pressure sensor (6). Based on the pressure calculation means (110) for calculating the pressure of the fluid based on at least one of the output signals, the output signal of the first pressure sensor (5) and the output signal of the second pressure sensor (6), A transmission time calculating means (120) for calculating a transmission time required for the pressure pulsation of the fluid to transmit between the position of the first pressure sensor (5) and the position of the second pressure sensor (6); In the transmission time calculated by the time calculation means (120) Zui it, characterized in that it comprises a correction means (130) for correcting the calculated value of the pressure of the fluid is calculated by the pressure calculating means (110).

これによると、流体の温度によって圧力脈動の伝達速度が変化するため、換言すると流体の温度と伝達時間は相関があるため、伝達時間に基づいて流体の圧力の算出値を補正することにより、流体の圧力を温度に係わらず正確に検出することができる。   According to this, since the transmission speed of pressure pulsation changes depending on the temperature of the fluid, in other words, there is a correlation between the temperature of the fluid and the transmission time. Therefore, by correcting the calculated value of the fluid pressure based on the transmission time, The pressure can be accurately detected regardless of the temperature.

請求項２に記載の発明では、請求項１に記載の圧力検出装置において、伝達時間算出手段（１２０）は、第１圧力センサ（５）の出力信号および第２圧力センサ（６）の出力信号の各々対応するピーク値に基づいて、伝達時間を算出することを特徴とする。   According to a second aspect of the present invention, in the pressure detection device according to the first aspect, the transmission time calculating means (120) includes an output signal of the first pressure sensor (5) and an output signal of the second pressure sensor (6). The transmission time is calculated based on the corresponding peak value.

これによると、流体の圧力脈動が伝達する伝達時間の算出を精度良く、かつ、容易に行なうことができる。   According to this, it is possible to accurately and easily calculate the transmission time during which the pressure pulsation of the fluid is transmitted.

請求項３に記載の発明では、高圧燃料を蓄える蓄圧器（１）と、この蓄圧器（１）から供給される燃料を内燃機関に噴射する噴射弁（２）と、蓄圧器（１）内の燃料を噴射弁（２）に導く燃料配管（４）とを備える燃料噴射装置に用いられる圧力検出装置であって、燃料配管（４）内を流れる燃料の圧力に応じた電気信号を出力する第１圧力センサ（５）と、この第１圧力センサ（５）よりも燃料流れ下流側に配置されて、燃料の圧力に応じた電気信号を出力する第２圧力センサ（６）と、第１圧力センサ（５）の出力信号および第２圧力センサ（６）の出力信号のうちの少なくとも一方に基づいて燃料の圧力を算出する圧力算出手段（１１０）と、第１圧力センサ（５）の出力信号および第２圧力センサ（６）の出力信号に基づいて、噴射弁に供給される燃料の圧力脈動が第２圧力センサ（６）の位置から第１圧力センサ（５）の位置に伝達されるまでの伝達時間を算出する伝達時間算出手段（１２０）と、この伝達時間算出手段（１２０）にて算出した伝達時間に基づいて、圧力算出手段（１１０）にて算出した燃料の圧力の算出値を補正する補正手段（１３０）とを備えることを特徴とする。   In the invention according to claim 3, the accumulator (1) for accumulating high-pressure fuel, the injection valve (2) for injecting the fuel supplied from the accumulator (1) to the internal combustion engine, and the accumulator (1) Is a pressure detection device used in a fuel injection device comprising a fuel pipe (4) for guiding the fuel to an injection valve (2), and outputs an electrical signal corresponding to the pressure of the fuel flowing in the fuel pipe (4) A first pressure sensor (5), a second pressure sensor (6) disposed downstream of the first pressure sensor (5) and outputting an electrical signal corresponding to the fuel pressure; Pressure calculating means (110) for calculating the pressure of the fuel based on at least one of the output signal of the pressure sensor (5) and the output signal of the second pressure sensor (6), and the output of the first pressure sensor (5) Based on the signal and the output signal of the second pressure sensor (6) A transmission time calculating means (120) for calculating a transmission time until the pressure pulsation of the fuel supplied to the fuel is transmitted from the position of the second pressure sensor (6) to the position of the first pressure sensor (5); And correction means (130) for correcting the calculated value of the fuel pressure calculated by the pressure calculation means (110) based on the transmission time calculated by the time calculation means (120).

これによると、燃料の圧力を温度に係わらず正確に検出することができる。   According to this, the fuel pressure can be accurately detected regardless of the temperature.

請求項４に記載の発明では、請求項３に記載の燃料噴射装置用圧力検出装置において、伝達時間算出手段（１２０）は、第１圧力センサ（５）の出力信号および第２圧力センサ（６）の出力信号の各々対応するピーク値に基づいて、伝達時間を算出することを特徴とする。   According to a fourth aspect of the present invention, in the pressure detection device for a fuel injection device according to the third aspect, the transmission time calculating means (120) includes the output signal of the first pressure sensor (5) and the second pressure sensor (6 ), The transmission time is calculated based on the corresponding peak value of each output signal.

これによると、噴射弁に供給される燃料の圧力脈動の伝達時間の算出を精度良く、かつ、容易に行なうことができる。   According to this, calculation of the transmission time of the pressure pulsation of the fuel supplied to the injection valve can be performed accurately and easily.

請求項５に記載の発明では、請求項３または４に記載の燃料噴射装置用圧力検出装置において、噴射弁（２）および燃料配管（４）は複数設けられ、特定の1つの前記燃料配管（４）にのみ、第１圧力センサ（５）および第２圧力センサ（６）が設けられることを特徴とする。   According to a fifth aspect of the present invention, in the pressure detection device for a fuel injection device according to the third or fourth aspect, a plurality of injection valves (2) and fuel pipes (4) are provided, and one specific fuel pipe ( Only in 4), the first pressure sensor (5) and the second pressure sensor (6) are provided.

これによると、圧力センサの設置数を低減することができ、噴射弁に供給される燃料の圧力脈動の伝達時間の算出を容易に行なうことができる。   According to this, the number of installed pressure sensors can be reduced, and the transmission time of the pressure pulsation of the fuel supplied to the injection valve can be easily calculated.

なお、この欄および特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。   In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

本発明の一実施形態に係る圧力検出装置を適用した燃料噴射装置の要部の構成を示す図である。It is a figure which shows the structure of the principal part of the fuel-injection apparatus to which the pressure detection apparatus which concerns on one Embodiment of this invention is applied. 図１の圧力センサの温度と出力との関係を示す特性図である。It is a characteristic view which shows the relationship between the temperature of the pressure sensor of FIG. 1, and an output. 図１のＥＣＵ３が行う圧力検出処理の内容を示すフローチャートである。It is a flowchart which shows the content of the pressure detection process which ECU3 of FIG. 1 performs. 図１の２つの圧力センサ５、６の出力信号を示す図である。It is a figure which shows the output signal of the two pressure sensors 5 and 6 of FIG. 圧力脈動の伝達速度と燃料の温度との関係を示す特性図である。FIG. 6 is a characteristic diagram showing the relationship between the pressure pulsation transmission speed and the fuel temperature.

本実施形態の圧力検出装置は、車両に搭載される内燃機関の燃料噴射装置に用いられる。図１に示すように、燃料噴射装置は、高圧燃料が蓄えられる蓄圧器１を備え、この蓄圧器１には複数の噴射弁２が接続されている。噴射弁２は、制御装置（以下、ＥＣＵという）３に制御されて所定の時期に所定の期間開弁して、蓄圧器１から供給される高圧燃料を内燃機関（より詳細にはディーゼルエンジン、図示せず）の各気筒内に噴射する。ここでは、４気筒エンジンの１つに対応する噴射弁２のみを示し、他の気筒に対応する噴射弁については図示を省略している。   The pressure detection device of this embodiment is used in a fuel injection device for an internal combustion engine mounted on a vehicle. As shown in FIG. 1, the fuel injection device includes a pressure accumulator 1 that stores high-pressure fuel, and a plurality of injection valves 2 are connected to the pressure accumulator 1. The injection valve 2 is controlled by a control device (hereinafter referred to as ECU) 3 and opens at a predetermined time for a predetermined period, and the high-pressure fuel supplied from the accumulator 1 is supplied to an internal combustion engine (more specifically, a diesel engine, The fuel is injected into each cylinder (not shown). Here, only the injection valve 2 corresponding to one of the four-cylinder engines is shown, and the illustration of the injection valves corresponding to the other cylinders is omitted.

蓄圧器１と噴射弁２は燃料配管４によって接続されており、蓄圧器１内の燃料は燃料配管４を介して噴射弁２に導かれるようになっている。また、燃料配管４中には、燃料配管４内を流れる燃料の圧力に応じた電気信号を出力する２つの圧力センサ５、６が配置されている。２つの圧力センサ５、６は、燃料流れ方向に沿って所定の距離だけ離されて配置されている。以下、２つの圧力センサ５、６のうち燃料流れ上流側に位置するセンサを第１圧力センサ５といい、燃料流れ下流側に位置するセンサを第２圧力センサ６という。   The pressure accumulator 1 and the injection valve 2 are connected by a fuel pipe 4, and the fuel in the pressure accumulator 1 is guided to the injection valve 2 through the fuel pipe 4. In the fuel pipe 4, two pressure sensors 5 and 6 that output an electrical signal corresponding to the pressure of the fuel flowing through the fuel pipe 4 are disposed. The two pressure sensors 5, 6 are arranged at a predetermined distance along the fuel flow direction. Hereinafter, the sensor located on the upstream side of the fuel flow among the two pressure sensors 5 and 6 is referred to as a first pressure sensor 5, and the sensor located on the downstream side of the fuel flow is referred to as a second pressure sensor 6.

ＥＣＵ３は、図示しないＣＰＵ、ＲＯＭ、ＲＡＭ等からなる周知のマイクロコンピュータを備え、マイクロコンピュータに記憶したプログラムに従って演算処理を行うものである。ＥＣＵ３には、第１圧力センサ５および第２圧力センサ６からの信号が随時入力されるとともに、エンジン回転数、車両のアクセルペダルの踏み込み量に相当するアクセル開度等の種々の情報が随時入力される。そして、ＥＣＵ３は、エンジンや車両の運転状態に応じた最適の噴射時期、噴射量（噴射期間）を算出して、各噴射弁２の開弁時期および開弁期間を制御する。   The ECU 3 includes a known microcomputer including a CPU, ROM, RAM, and the like (not shown), and performs arithmetic processing according to a program stored in the microcomputer. The ECU 3 receives signals from the first pressure sensor 5 and the second pressure sensor 6 as needed, and inputs various information such as the engine speed and the accelerator opening corresponding to the amount of depression of the accelerator pedal of the vehicle. Is done. The ECU 3 calculates the optimal injection timing and injection amount (injection period) according to the operating state of the engine and the vehicle, and controls the valve opening timing and valve opening period of each injection valve 2.

次に、上記ＥＣＵ３が行う圧力検出処理について説明する。本実施形態の２つの圧力センサ５、６は、図２に示すように、低温域では温度上昇に伴って出力電圧が急激に上昇し、中間温度域では温度上昇に伴って出力電圧が緩やかに上昇し、さらに高温域では温度上昇に伴って出力電圧が緩やかに減少するという、温度−出力特性を有するものである。   Next, the pressure detection process performed by the ECU 3 will be described. As shown in FIG. 2, in the two pressure sensors 5 and 6 of the present embodiment, the output voltage suddenly increases as the temperature rises in the low temperature range, and the output voltage gradually increases as the temperature rises in the intermediate temperature range. It has a temperature-output characteristic in which the output voltage rises gradually and gradually decreases as the temperature rises in the high temperature range.

図３に示すフローは、ＥＣＵ３が行うエンジン制御処理中に割り込み処理される。まず、ステップ１００では、２つの圧力センサ５、６の出力信号を読み込む。   The flow shown in FIG. 3 is interrupted during engine control processing performed by the ECU 3. First, in step 100, the output signals of the two pressure sensors 5, 6 are read.

圧力算出手段としてのステップ１１０では、第２圧力センサ６の出力信号に基づいて燃料配管４内の燃料の圧力を算出する。具体的には、出力信号と燃料の圧力との関係を定義したマップがＥＣＵ３に記憶されており、そのマップにて燃料の圧力を求める。本実施形態のように、第２圧力センサ６の出力信号を用いる場合、噴射弁２に近い位置での燃料配管４内の燃料の圧力を検出することができる。なお、蓄圧器１に近い位置での燃料配管４内の燃料の圧力を検出したい場合は、第１圧力センサ５の出力信号に基づいて燃料配管４内の燃料の圧力を算出する。   In step 110 as pressure calculation means, the pressure of the fuel in the fuel pipe 4 is calculated based on the output signal of the second pressure sensor 6. Specifically, a map defining the relationship between the output signal and the fuel pressure is stored in the ECU 3, and the fuel pressure is obtained from the map. When the output signal of the second pressure sensor 6 is used as in the present embodiment, the fuel pressure in the fuel pipe 4 at a position close to the injection valve 2 can be detected. When it is desired to detect the fuel pressure in the fuel pipe 4 at a position close to the accumulator 1, the fuel pressure in the fuel pipe 4 is calculated based on the output signal of the first pressure sensor 5.

伝達時間算出手段としてのステップ１２０では、第１圧力センサ５の出力信号および第２圧力センサ６の出力信号の各々対応するピーク値に基づいて、燃料噴射時に生じる圧力脈動が第２圧力センサ６の位置から第１圧力センサ５の位置に伝達されるまでの伝達時間ｔを算出する。   In step 120 as the transmission time calculation means, the pressure pulsation generated during fuel injection is caused by the second pressure sensor 6 based on the corresponding peak values of the output signal of the first pressure sensor 5 and the output signal of the second pressure sensor 6. A transmission time t from the position until it is transmitted to the position of the first pressure sensor 5 is calculated.

ここで、図４に示すように、噴射弁２からの圧力脈動が第２圧力センサ６の位置から第１圧力センサ５の位置に伝達されるまでに時間がかかるため、破線で示す第１圧力センサ５の出力信号と、実線で示す第２圧力センサ６の出力信号に、伝達時間ｔのずれが生じる。ステップ１２０では、この伝達時間ｔを算出する。   Here, as shown in FIG. 4, since it takes time until the pressure pulsation from the injection valve 2 is transmitted from the position of the second pressure sensor 6 to the position of the first pressure sensor 5, the first pressure indicated by the broken line is used. There is a difference in transmission time t between the output signal of the sensor 5 and the output signal of the second pressure sensor 6 indicated by the solid line. In step 120, this transmission time t is calculated.

補正手段としてのステップ１３０では、ステップ１１０で算出した燃料圧力を伝達時間ｔに基づいて補正する。具体的には、図５に示すように、燃料の温度が高くなるほど圧力脈動の伝達速度は高くなるため、燃料の温度が高くなるほど伝達時間ｔは短くなる。そこで、伝達時間ｔと温度補正量との関係を定義したマップをＥＣＵ３に記憶させておき、そのマップにて伝達時間ｔに基づいて温度補正量を求める。そして、ステップ１１０で算出した燃料圧力を温度補正量分補正して、補正後の燃料圧力を算出する。   In step 130 as correcting means, the fuel pressure calculated in step 110 is corrected based on the transmission time t. Specifically, as shown in FIG. 5, the transmission speed of pressure pulsation increases as the temperature of the fuel increases, and therefore the transmission time t decreases as the temperature of the fuel increases. Therefore, a map defining the relationship between the transmission time t and the temperature correction amount is stored in the ECU 3, and the temperature correction amount is obtained based on the transmission time t using the map. Then, the fuel pressure calculated in step 110 is corrected by the temperature correction amount, and the corrected fuel pressure is calculated.

なお、この補正後の燃料圧力は、ＥＣＵ３が行うエンジン制御処理において、噴射量算出の際に補正用のパラメータとして用いられる。   The corrected fuel pressure is used as a correction parameter when calculating the injection amount in the engine control process performed by the ECU 3.

以上述べたように、本実施形態によると、燃料の温度によって圧力脈動の伝達速度が変化するため、換言すると燃料の温度と伝達時間は相関があるため、伝達時間に基づいて燃料圧力の算出値を補正することにより、燃料圧力を温度に係わらず正確に検出することができる。   As described above, according to the present embodiment, since the transmission speed of pressure pulsation changes depending on the temperature of the fuel, in other words, since the fuel temperature and the transmission time are correlated, the calculated value of the fuel pressure is based on the transmission time. By correcting this, the fuel pressure can be accurately detected regardless of the temperature.

なお、複数の燃料配管４のうち、特定の1つの燃料配管４にのみ、第１圧力センサ５および第２圧力センサ６を設けてもよい。この場合、圧力センサの設置数を低減することができ、噴射弁２に供給される燃料の圧力脈動の伝達時間の算出を容易に行なうことができる。   The first pressure sensor 5 and the second pressure sensor 6 may be provided only in one specific fuel pipe 4 among the plurality of fuel pipes 4. In this case, the number of installed pressure sensors can be reduced, and the transmission time of the pressure pulsation of the fuel supplied to the injection valve 2 can be easily calculated.

（他の実施形態）
上記実施形態では、燃料噴射装置の噴射弁からの圧力脈動を検出する例を示したが、本発明の圧力検出装置は、燃料噴射装置の蓄圧器からの圧力脈動を検出することもできる。 (Other embodiments)
Although the example which detects the pressure pulsation from the injection valve of a fuel injection apparatus was shown in the said embodiment, the pressure detection apparatus of this invention can also detect the pressure pulsation from the pressure accumulator of a fuel injection apparatus.

また、上記実施形態では、圧力検出装置を内燃機関の燃料噴射装置に用いる例を示したが、本発明の圧力検出装置は、燃料噴射装置以外にも適用することができる。また、本発明の圧力検出装置は、燃料以外の流体の圧力検出にも適用することができる。   Moreover, although the example which uses a pressure detection apparatus for the fuel-injection apparatus of an internal combustion engine was shown in the said embodiment, the pressure detection apparatus of this invention is applicable besides a fuel-injection apparatus. The pressure detection device of the present invention can also be applied to pressure detection of fluids other than fuel.

２ 噴射弁
３ 制御装置
４ 配管
５ 第１圧力センサ
６ 第２圧力センサ 2 Injection valve 3 Control device 4 Piping 5 First pressure sensor 6 Second pressure sensor

Claims (5)

配管（４）内を流れる流体の圧力に応じた電気信号を出力する第１圧力センサ（５）と、
この第１圧力センサ（５）よりも流体流れ下流側に配置されて、前記流体の圧力に応じた電気信号を出力する第２圧力センサ（６）と、
前記第１圧力センサ（５）の出力信号および前記第２圧力センサ（６）の出力信号のうちの少なくとも一方に基づいて前記流体の圧力を算出する圧力算出手段（１１０）と、
前記第１圧力センサ（５）の出力信号および前記第２圧力センサ（６）の出力信号に基づいて、流体の圧力脈動が前記第１圧力センサ（５）の位置と前記第２圧力センサ（６）の位置との間を伝達するのに要した伝達時間を算出する伝達時間算出手段（１２０）と、
この伝達時間算出手段（１２０）にて算出した伝達時間に基づいて、前記圧力算出手段（１１０）にて算出した前記流体の圧力の算出値を補正する補正手段（１３０）とを備えることを特徴とする圧力検出装置。 A first pressure sensor (5) for outputting an electrical signal corresponding to the pressure of the fluid flowing in the pipe (4);
A second pressure sensor (6) disposed downstream of the first pressure sensor (5) and outputting an electrical signal corresponding to the pressure of the fluid;
Pressure calculating means (110) for calculating the pressure of the fluid based on at least one of an output signal of the first pressure sensor (5) and an output signal of the second pressure sensor (6);
Based on the output signal of the first pressure sensor (5) and the output signal of the second pressure sensor (6), the pressure pulsation of the fluid is caused by the position of the first pressure sensor (5) and the second pressure sensor (6). ) A transmission time calculating means (120) for calculating a transmission time required to transmit between
Correction means (130) for correcting the calculated value of the fluid pressure calculated by the pressure calculation means (110) based on the transmission time calculated by the transmission time calculation means (120). A pressure detection device. 請求項１に記載の圧力検出装置において、
前記伝達時間算出手段（１２０）は、前記第１圧力センサ（５）の出力信号および前記第２圧力センサ（６）の出力信号の各々対応するピーク値に基づいて、前記伝達時間を算出することを特徴とする圧力検出装置。 The pressure detection device according to claim 1,
The transmission time calculating means (120) calculates the transmission time based on the corresponding peak values of the output signal of the first pressure sensor (5) and the output signal of the second pressure sensor (6). A pressure detection device characterized by. 高圧燃料を蓄える蓄圧器（１）と、この蓄圧器（１）から供給される燃料を内燃機関に噴射する噴射弁（２）と、前記蓄圧器（１）内の燃料を前記噴射弁（２）に導く燃料配管（４）とを備える燃料噴射装置に用いられる圧力検出装置であって、
前記燃料配管（４）内を流れる燃料の圧力に応じた電気信号を出力する第１圧力センサ（５）と、
この第１圧力センサ（５）よりも燃料流れ下流側に配置されて、前記燃料の圧力に応じた電気信号を出力する第２圧力センサ（６）と、
前記第１圧力センサ（５）の出力信号および前記第２圧力センサ（６）の出力信号のうちの少なくとも一方に基づいて前記燃料の圧力を算出する圧力算出手段（１１０）と、
前記第１圧力センサ（５）の出力信号および前記第２圧力センサ（６）の出力信号に基づいて、前記噴射弁（２）に供給される燃料の圧力脈動が前記第２圧力センサ（６）の位置から前記第１圧力センサ（５）の位置に伝達されるまでの伝達時間を算出する伝達時間算出手段（１２０）と、
この伝達時間算出手段（１２０）にて算出した伝達時間に基づいて、前記圧力算出手段（１１０）にて算出した前記燃料の圧力の算出値を補正する補正手段（１３０）とを備えることを特徴とする燃料噴射装置用圧力検出装置。 A pressure accumulator (1) for storing high-pressure fuel, an injection valve (2) for injecting fuel supplied from the pressure accumulator (1) to an internal combustion engine, and a fuel in the pressure accumulator (1) for the injection valve (2 A pressure detection device used in a fuel injection device comprising a fuel pipe (4) leading to
A first pressure sensor (5) for outputting an electrical signal corresponding to the pressure of fuel flowing in the fuel pipe (4);
A second pressure sensor (6) disposed downstream of the first pressure sensor (5) and outputting an electrical signal corresponding to the pressure of the fuel;
Pressure calculating means (110) for calculating the pressure of the fuel based on at least one of an output signal of the first pressure sensor (5) and an output signal of the second pressure sensor (6);
Based on the output signal of the first pressure sensor (5) and the output signal of the second pressure sensor (6), the pressure pulsation of the fuel supplied to the injection valve (2) is changed to the second pressure sensor (6). A transmission time calculating means (120) for calculating a transmission time from the position of the first pressure sensor (5) to the position of the first pressure sensor (5);
Correction means (130) for correcting the calculated value of the fuel pressure calculated by the pressure calculation means (110) based on the transmission time calculated by the transmission time calculation means (120). A pressure detection device for a fuel injection device. 請求項３に記載の燃料噴射装置用圧力検出装置において、
前記伝達時間算出手段（１２０）は、前記第１圧力センサ（５）の出力信号および前記第２圧力センサ（６）の出力信号の各々対応するピーク値に基づいて、前記伝達時間を算出することを特徴とする燃料噴射装置用圧力検出装置。 In the pressure detection apparatus for fuel injection devices according to claim 3,
The transmission time calculating means (120) calculates the transmission time based on the corresponding peak values of the output signal of the first pressure sensor (5) and the output signal of the second pressure sensor (6). A pressure detection device for a fuel injection device. 請求項３または４に記載の燃料噴射装置用圧力検出装置において、
前記噴射弁（２）および燃料配管（４）は複数設けられ、特定の1つの前記燃料配管（４）にのみ、前記第１圧力センサ（５）および第２圧力センサ（６）が設けられることを特徴とする燃料噴射装置用圧力検出装置。 The pressure detection device for a fuel injection device according to claim 3 or 4,
A plurality of the injection valves (2) and fuel pipes (4) are provided, and the first pressure sensor (5) and the second pressure sensor (6) are provided only in one specific fuel pipe (4). A pressure detection device for a fuel injection device.
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