WO2011125851A1 - 燃料タンクシステム - Google Patents
燃料タンクシステム Download PDFInfo
- Publication number
- WO2011125851A1 WO2011125851A1 PCT/JP2011/058246 JP2011058246W WO2011125851A1 WO 2011125851 A1 WO2011125851 A1 WO 2011125851A1 JP 2011058246 W JP2011058246 W JP 2011058246W WO 2011125851 A1 WO2011125851 A1 WO 2011125851A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- tank
- amount
- liquid level
- fuel tank
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus 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
- F02M37/0076—Details of the fuel feeding system related to the fuel tank
- F02M37/0088—Multiple separate fuel tanks or tanks being at least partially partitioned
- F02M37/0094—Saddle tanks; Tanks having partition walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus 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
- F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
- F02M37/025—Feeding by means of a liquid fuel-driven jet pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus 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
- F02M37/04—Feeding by means of driven pumps
- F02M37/08—Feeding by means of driven pumps electrically driven
- F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
- F02M37/106—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir the pump being installed in a sub-tank
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2713—Siphons
- Y10T137/2842—With flow starting, stopping or maintaining means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
- Y10T137/85986—Pumped fluid control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
- Y10T137/86075—And jet-aspiration type pump
Definitions
- the present invention relates to a fuel tank system. More specifically, the present invention relates to a fuel tank system including a fuel tank in which two fuel reservoirs are formed, and transferring fuel from one of the fuel reservoirs to the other by a siphon tube.
- a vehicle using an internal combustion engine as a power source is provided with a fuel tank for storing fuel supplied to the internal combustion engine.
- the fuel tank is formed in a shape suitable for a vehicle-specific layout, but in recent years, a so-called saddle type fuel suitable for various types of vehicles such as four-wheel drive vehicles, rear wheel drive vehicles, and hybrid vehicles. Tank development is fostering.
- the vertical fuel tank has a concave cross section along the vehicle width direction at the bottom of the tank, and at least two fuel reservoirs, a first fuel reservoir and a second fuel reservoir, are formed.
- a vertical fuel tank in order to prevent an excessive amount of fuel from accumulating in one of the fuel reservoirs, it is necessary to provide a device for keeping the fuel level in the two fuel reservoirs equal. is there.
- Patent Document 1 discloses a siphon that transfers fuel from one of the first fuel reservoir and the second fuel reservoir to the other. A tube is shown.
- the present invention provides a fuel tank system that keeps the fuel level in two fuel reservoirs equal by siphon pipes, and can estimate the amount of fuel in the fuel tank with high accuracy. Objective.
- the present invention provides a fuel tank (for example, described later) in which a first fuel pool (for example, a main tank unit 16 described later) and a second fuel pool (for example, a sub tank unit 18 described later) are formed.
- Fuel tank 10 and a siphon tube (for example, a siphon tube described later) that is disposed over the first and second fuel reservoirs and transfers fuel from one of the first and second fuel reservoirs to the other.
- a fuel tank system for a vehicle for example, a fuel tank system 1 described later.
- the fuel tank system further includes transfer state determination means (for example, ECU 60 described later) for determining whether or not the fuel is in a transfer state.
- the fuel in a fuel tank system having a siphon tube disposed over two fuel reservoirs, the fuel is transferred from one fuel reservoir to the other fuel reservoir by the state of fuel transfer, that is, the siphon tube.
- the transfer judging means for judging whether or not it is in a state of being performed is provided. As a result, it can be determined whether or not the fluctuation of the liquid level in the fuel tank is caused by the transfer of the fuel through the siphon tube. As a result, it is determined whether or not the fuel is being refueled. It can be determined with high accuracy. Further, since it can be determined with high accuracy whether or not the fuel is being refueled, as a result, the amount of fuel in the fuel tank can also be estimated with high accuracy.
- the fuel tank system further includes liquid level detecting means (for example, a sender unit 50 described later) for detecting the liquid level of the fuel stored in one of the first and second fuel reservoirs,
- the transfer state determination means determines that the fuel is in the transfer state when the rate of change of the detected value of the liquid level (for example, a fuel increase speed VF described later) is equal to or lower than a predetermined threshold (for example, threshold VF_th described later). It is preferable to determine that the fuel is not in a transfer state when the rate of change in the detected value of the liquid level is greater than the threshold value.
- the change rate of the detection value of the liquid level includes a change rate of a parameter substantially proportional to the detection value of the liquid level.
- the transfer state determination means is configured such that when the change rate of the detected value of the liquid level of the fuel stored in one of the two fuel reservoirs is equal to or less than the predetermined threshold, the fuel is in the transfer state. If it is determined that there is a change rate of the detection value of the liquid level greater than the threshold value, it is determined that the fuel is not in a transfer state.
- the rate of change in the liquid level in the fuel tank is smaller when the siphon tube is transferred than when the siphon tube is transferred and when the oil is supplied. Therefore, the transfer state determination means can determine whether or not the fuel transfer state is with higher accuracy, and as a result, the estimation accuracy of the fuel amount in the fuel tank can be further increased.
- the fuel tank system determines that the fuel is not in the transfer state by the transfer state determination means, and the amount of change in the detected value of the liquid level at a predetermined timing is
- the fuel supply state determination unit further determines that the fuel is in a fuel supply state when the fuel is larger than the predetermined threshold value.
- the change amount of the liquid level detection value includes a change amount of a parameter substantially proportional to the detection value of the liquid level.
- the fuel supply state determination means determines that the fuel is not in the transfer state by the transfer state determination means when the vehicle is stopped, and the amount of change in the detected value of the liquid level at a predetermined time
- a predetermined threshold for example, threshold WF_th described later
- FIG. 1 is a schematic diagram showing a configuration of a fuel tank system 1 according to the present embodiment.
- the fuel tank system 1 includes a saddle type fuel tank 10 and an electronic control unit (hereinafter referred to as “ECU”) 60 connected to the fuel tank 10 and is mounted on a vehicle (not shown). 1 shows a cross-sectional view of the fuel tank 10 along the vehicle width direction.
- ECU electronice control unit
- a flange 14 that is curved upward and serves as a main tank 16 as a first fuel reservoir and a second fuel reservoir.
- the sub-tank portion 18 is partitioned.
- the main tank 16 is provided with a fuel pump module 20 that pumps up fuel stored in the fuel tank 10 and supplies it to an engine (not shown).
- the fuel pump module 20 includes a fuel pump 22 and a pressure regulator 26 connected to the fuel pump 22.
- the fuel pump 22 pumps up fuel stored in the main tank portion 16 from the fuel suction port 24 a by a pumping jet pump 24 that opens to the bottom portion 16 a of the main tank portion 16, and pumps it to the pressure regulator 26.
- a fuel pipe 28 communicating with the engine and a return branch pipe 30 provided with a suction jet pump 32 on the tip side thereof.
- a siphon tube 34 is disposed across the bottom portion 16 a of the main tank portion 16 and the bottom portion 18 a of the sub tank portion 18.
- One end side of the suction conduit 40 is connected to the siphon tube 34 on the upper side via a three-way joint 36.
- the other end of the suction conduit 40 is connected to the suction side (negative pressure side) of the suction jet pump 32 described above.
- a backflow prevention valve 38 is provided at a connection portion 36a on one end side of the suction pipe 40 in the three-way joint 36, so that fuel can flow only from the siphon pipe 34 side to the suction jet pump 32 side. Yes.
- An open end 34 a of the siphon pipe 34 on the main tank portion 16 side is located on the bottom 16 a of the main tank portion 16 and on the outer side in the vehicle width direction of the main tank portion 16 out of the suction jet pump 32. It is arranged adjacent to the inner wall 16b.
- the open end 34a is equipped with a switching valve 42a that closes the open end 34a by detecting gas and opens the open end 34a by detecting liquid.
- the open end 34b of the siphon tube 34 on the sub tank portion 18 side is disposed on the bottom portion 18a of the sub tank portion 18 and adjacent to the inner wall 18b on the outer side in the vehicle width direction.
- the open end 34b is provided with a switching valve 42b that closes the open end 34b by detecting gas and opens the open end 34b by detecting liquid.
- a sender unit 50 for detecting the liquid level of the fuel stored in the main tank portion 16 is provided.
- the sender unit 50 detects a detection signal (hereinafter referred to as a “sender signal”) that is substantially proportional to the position of the float 51 floating on the liquid level of the fuel stored in the main tank 16, that is, the liquid level of the fuel stored in the main tank 16.
- the sender signal is detected by the ECU 60.
- the fuel tank 10 configured as described above will be described.
- FIG. 2 a case will be described in which the engine is started in a state where the fuel F is stored only in the main tank portion 16 (for example, at the time of factory shipment).
- the fuel pump 22 of the fuel pump module 20 is driven, and the fuel F stored in the main tank portion 16 is sucked from the fuel suction port 24 a under the action of the pumping jet pump 24.
- the sucked fuel F is supplied from the pressure regulator 26 to the engine via the fuel pipe 28.
- a part of the fuel F sucked from the fuel suction port 24 a is supplied to the suction jet pump 32 through the branch pipe 30, and a negative pressure is generated in the suction pipe 40.
- the suction conduit 40 communicates with the siphon tube 34 via the three-way joint 36, and the inside of the siphon tube 34 is sucked.
- the open end 34a of the siphon tube 34 on the main tank 16 side is closed because it is in the fuel F, and the open end 34b on the sub tank 18 side is open.
- the fuel F sucked up from the open end 34a of the siphon tube 34 on the main tank portion 16 side is absorbed into the sub tank portion 18 side. Is transferred to the open end 34b side.
- the open end 34b is opened by supplying the fuel F, and the fuel F on the main tank 16 side is transferred to the sub tank 18 side.
- the siphon function is exhibited by the siphon tube 34, and as a result, the liquid level of the fuel F in the main tank portion 16 and the liquid level of the fuel transferred to the sub tank portion 18 become the same height. In addition, the fuel F is transferred from one of the main tank portion 16 and the sub tank portion 18 to the other.
- the fuel F in the upper main tank portion 16 is transferred to the lower sub tank portion 18 by the siphon function of the siphon pipe 34.
- the liquid level of the fuel in the main tank part 16 and the sub tank part 18 is adjusted so that it may become the same height.
- the backflow prevention valve 38 provided at the connection portion 36a of the three-way joint 36 does not backflow from the siphon conduit 40 to the siphon tube 34 side. Therefore, even when the engine is stopped, the siphon function of the siphon pipe 34 is exerted, and the fuel levels of the main tank portion 16 and the sub tank portion 18 are adjusted to be the same.
- the ECU 60 shapes input signal waveforms from various sensors, corrects the voltage level to a predetermined level, and converts an analog signal into a digital signal, and a central processing unit.
- a unit hereinafter referred to as “CPU”.
- the ECU 60 includes a storage circuit that stores various calculation programs executed by the CPU, calculation results, and the like, and an output circuit that outputs a control signal to the fuel meter 70.
- the ECU 60 is equipped with a fuel amount supplied from the fuel tank 10 and injected into the engine (hereinafter referred to as “fuel injection amount”), and a fuel tank system 1.
- fuel injection amount supplied from the fuel tank 10 and injected into the engine
- fuel tank system 1 Various signals such as a vehicle speed and an ON / OFF signal from an ignition switch (not shown) are input.
- the ECU 60 estimates the amount of fuel stored in the fuel tank 10 based on the sender signal, the fuel injection amount, the vehicle speed, the signal from the ignition switch, and the like, and transmits a meter indication value to the fuel meter 70.
- the fuel meter 70 displays the amount of fuel in the fuel tank 10 according to the meter instruction value.
- FIG. 4 is a diagram schematically illustrating the concept of meter control by the ECU.
- the meter control state is changed between the fuel injection control state and the non-fuel injection control state
- the amount of fuel stored in the fuel tank is estimated based on an algorithm set for each of the three control states, and the meter indication value is based on this estimation. Is calculated.
- an algorithm for estimating the amount of fuel in the fuel tank in each of the fuel injection control state, the non-fuel injection state, and the fuel supply state will be described.
- Fuel injection control state When the meter control state is the fuel injection control state, the ECU sequentially subtracts the fuel supplied to the running of the vehicle from the predetermined initial value of the fuel amount in the fuel tank to thereby reduce the fuel in the fuel tank. An amount is estimated, and a meter indication value is calculated based on the estimated fuel amount. Therefore, in this case, the amount of fuel in the fuel tank, that is, the indicated value of the meter, basically only decreases and does not increase. More specifically, when the meter control state is the fuel injection control state, the ECU estimates the fuel amount in the fuel tank based on two types of parameters, a sender signal and a fuel injection amount.
- the meter control state When the meter control state is the fuel injection control state and the predetermined condition is satisfied, the meter control state shifts from the fuel injection control state to the non-fuel injection control state. Further, when the meter control state is in the fuel injection control state, the meter control state is determined according to the determination that the fuel supply state is in accordance with the procedure described later with reference to FIGS. 5 and 6. Transition from the fuel injection control state to the fuel supply state.
- Non-fuel injection control state is the fuel injection control state
- the ECU estimates the fuel amount in the fuel tank based on the sender signal, and further calculates the meter instruction value based on the estimated fuel amount. Accordingly, in this case, the amount of fuel in the fuel tank, that is, the meter indication value, may be increased as well as lowered, unlike the fuel injection control state.
- the meter control state When the meter control state is in the non-fuel injection control state and the predetermined condition is satisfied, the meter control state shifts from the non-fuel injection control state to the fuel injection control state. Further, when the meter control state is in the fuel injection control state, the meter control state is determined according to the determination that the fuel supply state is in accordance with the procedure described later with reference to FIGS. 5 and 6. Transition from the non-fuel injection control state to the refueling state.
- the fuel amount in the fuel tank is estimated by subtracting the fuel injection amount from the initial value of the fuel amount in the fuel tank.
- the fuel tank system of this embodiment that employs a vertical fuel tank, when the amount of fuel in the fuel tank is always estimated with high accuracy, the transfer of fuel between the main tank and the sub tank or the fuel tank Liquid level fluctuations due to tilting or the like become a problem.
- the fuel amount based on the subtraction of the fuel injection amount from the initial value it is possible to estimate regardless of the fuel level fluctuation.
- the ECU estimates the amount of fuel in the fuel tank after refueling is completed based on a plurality of parameters such as the sender signal and the change rate of the sender signal, Further, a meter instruction value is calculated based on the estimated fuel amount.
- FIG. 5 is a diagram showing an example of a time chart of a sender signal when the vehicle is stopped (the vehicle speed becomes 0 [km / h]) and fuel is supplied.
- FIG. 5 is a diagram illustrating a change in the sender signal when the running vehicle stops at time t1 and fuel supply starts while the vehicle stops at time t3.
- the ECU samples a sender signal at a time t2 after a predetermined time from when the vehicle speed becomes 0 [km / h] and the vehicle stops, and the fuel amount corresponding to the sampled sender signal at this time is determined as a stop time reference.
- the fuel amount corresponding to the sender signal is the fuel in the fuel tank that is uniquely calculated from the value of the sender signal using a map (not shown) indicating the relationship between the capacity of the fuel tank and the liquid level.
- the sender signal is a signal that is substantially proportional to the liquid level of the fuel stored in the main tank portion, and is generally different from the liquid level of the fuel stored in the sub tank portion. In this embodiment, it is assumed that the liquid level in the main tank part and the liquid level in the sub tank part are the same, and the fuel amount corresponding to the sender signal is calculated using the map.
- the ECU samples the sender signal at a predetermined cycle, and stores the fuel amount corresponding to the sender signal at this time as the detected fuel amount RF_jdg during stoppage (see the white circle in FIG. 5).
- the ECU calculates the fuel increase rate VF based on the difference between the current sampling value and the previous sampling value of the stoppage detected fuel amount RF_jdg while calculating the stoppage detection fuel amount RF_jdg corresponding to the sender signal.
- the increase speed VF is compared with a predetermined threshold value VF_th. When the increase speed VF is less than or equal to the threshold value VF_th, it is determined that the fuel is in the transfer state. When the increase speed VF is greater than the threshold value VF_th, the fuel Is determined to be in a transfer state.
- FIG. 6 is a diagram comparing the amount of change in the liquid level for each cause of the change.
- the increase rate of the fuel amount when the fuel is transferred through the siphon tube is smaller than the increase rate of the fuel amount when the fuel is supplied by the fuel filler. Therefore, as described above, by setting the threshold value VF_th for the fuel amount increase rate VF (see the broken line in FIG. 6), it is determined whether or not the change in the liquid level is due to the transfer. it can.
- the meter control state is shifted to the above-described fuel supply state, and the fuel amount in the fuel tank after the fuel supply is completed is estimated. Furthermore, when the transfer state is determined, the reflection to the meter indication value is prohibited, so that the meter error due to the transfer can be prevented. Thereby, when reflecting the next meter indication value on a meter, it does not fluctuate rapidly.
- the following effects can be obtained. (1) According to the present embodiment, by determining whether or not the fuel is transferred through the siphon tube 34, it is possible to determine whether or not the fuel is being refueled as a result. Can be determined. Further, since it can be determined with high accuracy whether or not the fuel is being refueled, as a result, the amount of fuel in the fuel tank can also be estimated with high accuracy.
- the fuel amount increase rate VF calculated based on the detection value (sender signal) of the sender unit that detects the liquid level of the fuel stored in the main tank portion is equal to or less than the threshold value VF_th.
- the fuel amount increase rate VF is greater than the threshold value VF_th, it is determined that the fuel is not in the transfer state.
- the cause of the change in the liquid level can be said to be due to refueling if it is not due to transfer.
- the fuel increase rate VF is greater than the threshold value VF_th and the fuel is not in a transfer state
- the fuel increase amount WF after the vehicle stops is When it is larger than the threshold WF_th, it is determined that the fuel is in a fuel supply state.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
Description
なお、本発明において、上記液位の検出値の変化率とは、当該液位の検出値に略比例したパラメータの変化率を用いたものも含むものとする。
なお、本発明において、上記液位の検出値の変化量とは、当該液位の検出値に略比例したパラメータの変化量を用いたものも含むものとする。
図1は、本実施形態に係る燃料タンクシステム1の構成を示す模式図である。
燃料タンクシステム1は、鞍型の燃料タンク10と、この燃料タンク10に接続された電子制御ユニット(以下、「ECU」という)60とを含んで構成され、図示しない車両に搭載される。なお、図1には、燃料タンク10の車幅方向に沿った断面図を示す。
サイフォン管34のサブタンク部18側の開放端34bは、サブタンク部18の底部18aに、かつ、車幅方向外側の内壁18bに隣接して配置されている。この開放端34bには、気体を検出することで開放端34bを閉じ、液体を検出することで開放端34bを開く切替バルブ42bが装着されている。
例えば、図2に示すように、メインタンク部16のみに燃料Fが貯留されている状態(例えば、工場出荷時など)で、エンジンの始動が行われた場合について説明する。
この場合、先ず、燃料ポンプモジュール20の燃料ポンプ22が駆動され、メインタンク部16に貯留されている燃料Fは、汲み上げ用ジェットポンプ24の作用下に燃料吸引口24aから吸引される。吸引された燃料Fは、プレッシャレギュレータ26から燃料配管28を介してエンジンに供給される。
一方、燃料吸引口24aから吸引された燃料Fの一部は、分岐配管30を介してサクション用ジェットポンプ32に供給され、サクション用管路40に負圧が発生する。サクション用管路40は、3方向ジョイント36を介してサイフォン管34に連通しており、このサイフォン管34内が吸引される。ここで、サイフォン管34のメインタンク部16側の開放端34aは燃料F内にあるため閉じており、サブタンク部18側の開放端34bは開いている。このため、サクション用ジェットポンプ32の作用下に、サイフォン管34内が吸引されると、このサイフォン管34の、メインタンク部16側の開放端34aから吸い上げられた燃料Fは、サブタンク部18側の開放端34b側に移送される。開放端34bでは、燃料Fが供給されることにより開かれ、メインタンク部16側の燃料Fがサブタンク部18側に移送される。この後は、サイフォン管34によりサイフォン機能が発揮され、結果として、メインタンク部16内の燃料Fの液位と、サブタンク部18に移送された燃料の液位とが同一の高さになるように、メインタンク部16およびサブタンク部18のうちいずれか一方から他方へ燃料Fが移送される。
ECUでは、燃料タンク内の燃料量を精度良く推定するため、すなわち車両の走行状態に応じてメータ指示値が大きく変動しないように、メータ制御の状態を、燃料噴射制御状態と非燃料噴射制御状態と給油状態との3種類で切り換え、そして、これら3種類の制御状態ごとに設定されたアルゴリズムに基づいて、燃料タンク内に貯留された燃料量を推定し、この推定に基づいてメータの指示値を算出する。以下、これら燃料噴射制御状態、非燃料噴射状態、給油状態のそれぞれにおいて燃料タンク内の燃料量を推定するアルゴリズムについて説明する。
メータ制御の状態が燃料噴射制御状態にあるとき、ECUは、燃料タンク内の燃料量の所定の初期値から、車両の走行に供された分の燃料を逐次減算することにより燃料タンク内の燃料量を推定し、さらにこの推定した燃料量に基づいてメータ指示値を算出する。従ってこの場合、燃料タンク内の燃料量、すなわちメータの指示値は、基本的には下降するのみであり上昇することはない。より具体的には、メータ制御の状態が燃料噴射制御状態にあるとき、ECUは、センダ信号と、燃料噴射量と、の2種類のパラメータに基づいて燃料タンク内の燃料量を推定する。
また、メータ制御の状態が燃料噴射制御状態にあるときに、後に図5および図6を参照して説明する手順により、給油状態であると判定されたことに応じて、メータ制御の状態は、燃料噴射制御状態から給油状態へ移行する。
メータ制御の状態が燃料噴射制御状態にあるとき、ECUは、センダ信号に基づいて燃料タンク内の燃料量を推定し、さらにこの推定した燃料量に基づいてメータ指示値を算出する。従ってこの場合、燃料タンク内の燃料量、すなわちメータ指示値は、上記燃料噴射制御状態とは異なり、下降だけでなく上昇する場合もある。
また、メータ制御の状態が燃料噴射制御状態にあるときに、後に図5および図6を参照して説明する手順により、給油状態であると判定されたことに応じて、メータ制御の状態は、非燃料噴射制御状態から給油状態へ移行する。
上述のように、燃料噴射制御状態では、燃料タンク内の燃料量の初期値から燃料噴射量を減算することにより燃料タンク内の燃料量を推定する。鞍型の燃料タンクを採用した本実施形態の燃料タンクシステムでは、燃料タンク内の燃料量を常に高い精度で推定する場合、メインタンク部とサブタンク部との間での燃料の移送や燃料タンクの傾斜などによる液位変動が課題となる。これに対して、初期値から燃料噴射量の減算に基づいて燃料量を推定することにより、燃料の液位変動によらず推定することが可能となる。
上述のように、鞍型の燃料タンクを採用した本実施形態の燃料タンクシステムでは、燃料タンク内の燃料量を常に高い精度で推定するには、給油が完了した後における燃料量を高い精度でかつ速やかに推定できる必要がある。このため、燃料が給油されている状態であるか否かを高い精度で判定することも重要となる。特に、サイフォン管を備えた本実施形態の燃料タンクシステムでは、メインタンク部内の液位の上昇は、燃料の給油に起因するものだけでなく、サイフォン管を介したサブタンク部側からメインタンク部側への移送に起因するものも含まれる。このため、燃料の給油の判定には、液位の変動がサイフォン管を介した燃料の移送によるものであることを判定することも重要となる。以下、図5、6を参照して、本実施形態の給油状態の判定の手順について説明する。
サイフォン管を伝って燃料が移送する場合における燃料量の増加速度は、給油機により燃料を給油した場合における燃料量の増加速度よりも小さい。したがって、上述のように、燃料量の増加速度VFに対し、閾値VF_thを設定することにより(図6中、破線参照)、液位の変化が移送によるものであるか否かを判定することができる。
さらに、移送状態と判定された場合にメータ指示値への反映を禁止することで、移送によるメータの誤差を防ぐことができる。これにより、次回のメータ指示値をメータに反映させる際に、急激に変動することがない。
(1)本実施形態によれば、サイフォン管34を介して燃料が移送する移送状態であるか否かを判定することにより、結果として燃料が給油されている状態であるか否かを高い精度で判定することができる。また、燃料が給油されている状態であるか否かを高い精度で判定できるので、結果として、燃料タンク内の燃料量も高い精度で推定することができる。
10…燃料タンク
16…メインタンク部(第1燃料溜り部)
18…サブタンク部(第2燃料溜り部)
34…サイフォン管
50…センダユニット(液位検出手段)
60…ECU(移送状態判定手段、給油状態判定手段)
70…燃料メータ(メータ)
Claims (3)
- 第1燃料溜り部および第2燃料溜り部が形成された燃料タンクと、
前記第1、第2燃料溜り部にわたって配置され、これら第1、第2燃料溜り部のうちいずれか一方から他方へ燃料を移送するサイフォン管と、を備える車両用の燃料タンクシステムであって、
燃料の移送状態であるか否かを判定する移送状態判定手段をさらに備えることを特徴とする燃料タンクシステム。 - 前記第1、第2燃料溜り部のうちいずれかに貯留された燃料の液位を検出する液位検出手段をさらに備え、
前記移送状態判定手段は、前記液位の検出値の変化率が所定の閾値以下である場合には燃料が移送状態であると判定し、前記液位の検出値の変化率が前記閾値より大きい場合には燃料が移送状態ではないと判定することを特徴とする請求項1に記載の燃料タンクシステム。 - 前記車両が停止している時に、前記移送状態判定手段により燃料が移送状態ではないと判定され、かつ、所定の時期における前記液位の検出値の変化量が所定の閾値より大きい場合には、燃料が給油状態であると判定する給油状態判定手段をさらに備えることを特徴とする請求項2に記載の燃料タンクシステム。
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CN201180015462.5A CN102822495B (zh) | 2010-03-31 | 2011-03-31 | 燃料箱系统 |
JP2012509581A JP5291250B2 (ja) | 2010-03-31 | 2011-03-31 | 燃料タンクシステム |
US13/637,033 US8955545B2 (en) | 2010-03-31 | 2011-03-31 | Fuel tank system |
DE201111101159 DE112011101159T5 (de) | 2010-03-31 | 2011-03-31 | Kraftstofftanksystem |
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US (1) | US8955545B2 (ja) |
JP (1) | JP5291250B2 (ja) |
CN (1) | CN102822495B (ja) |
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US20130008524A1 (en) | 2013-01-10 |
JPWO2011125851A1 (ja) | 2013-07-11 |
CN102822495B (zh) | 2015-06-03 |
JP5291250B2 (ja) | 2013-09-18 |
US8955545B2 (en) | 2015-02-17 |
DE112011101159T5 (de) | 2013-01-10 |
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