WO2011114538A1 - Détecteur optique de carburant - Google Patents

Détecteur optique de carburant Download PDF

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Publication number
WO2011114538A1
WO2011114538A1 PCT/JP2010/054903 JP2010054903W WO2011114538A1 WO 2011114538 A1 WO2011114538 A1 WO 2011114538A1 JP 2010054903 W JP2010054903 W JP 2010054903W WO 2011114538 A1 WO2011114538 A1 WO 2011114538A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
fuel
sample container
fuel sensor
wavelength
Prior art date
Application number
PCT/JP2010/054903
Other languages
English (en)
Inventor
Koji Kitano
Hiromichi Yanagihara
Wilhelm Brandstaetter
Gernot Boiger
Original Assignee
Toyota Jidosha Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Jidosha Kabushiki Kaisha filed Critical Toyota Jidosha Kabushiki Kaisha
Priority to PCT/JP2010/054903 priority Critical patent/WO2011114538A1/fr
Publication of WO2011114538A1 publication Critical patent/WO2011114538A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/4133—Refractometers, e.g. differential
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G01N21/643—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/26—Oils; Viscous liquids; Paints; Inks
    • G01N33/28—Oils, i.e. hydrocarbon liquids
    • G01N33/2835—Specific substances contained in the oils or fuels
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/02—Mechanical
    • G01N2201/021—Special mounting in general
    • G01N2201/0216—Vehicle borne

Definitions

  • the present invention relates to an optical fuel sensor, more particularly to an optical fuel sensor that is suitable for detecting a property of fuel on a vehicle.
  • a sensor for detecting a property of fuel on a vehicle has been known such as described, for example, in a following patent document 1.
  • the sensor described in the patent document 1 has a cavity for accommodating fuel that is an object of the detection.
  • the cavity is provided with a reflector at the bottom thereof.
  • the cavity is covered with a prism.
  • An LED and a photodiode are placed above the prism.
  • the light emitted from the LED penetrates the prism and the fuel- so as -to arrive at the refl-ector.
  • the light reflected by the reflector penetrates the fuel and the prism again so as to arrive at the photodiode.
  • An optical transmission of light changes depending on a concentration of alcohol included in fuel . According to the above described sensor, it is possible to calculate the optical transmission of the light if the output of the photodiode is detectable because the optical power of the LED is previously known. Thus, an alcohol concentration in fuel can be detected by using the sensor.
  • an intensity of the light arriving at the fuel may change due to dirt of the prism or change of the emission intensity of the LED in the above described prior sensor. Further, according to the sensor, when the
  • the intensity of the light arriving at the fuel changes, the intensity of the light arriving at the photo diode changes so as to change the output of the photodiode independently of a property of the fuel.
  • the present invention has been made to solve the above problem. It is an object of the present invention to provide an optical fuel sensor that is capable of
  • the first aspect of the present invention is an optical fuel sensor comprising :
  • a sample container for accommodating fuel while passing light having a wavelength from 420 nm to 700 nm;
  • a light source for emitting light with a stronger intensity within a wavelength band from 420 nm to 520 nm than outside of it so as to irradiate said sample container with the light;
  • a light detector element for receiving light radiated from said sample container so as to generate an output upon receiving the light, said light detector showing a stronger sensitivity within a wavelength band from 500 nm to 700 nm than outside of it.
  • a second aspect of the present invention is the 10 054903
  • optical fuel sensor according to the first aspect of the present invention, wherein said sample container is
  • a third aspect of the present invention is the optical fuel sensor according to the first or second aspect of the present invention, wherein
  • said light source and said light detector element are placed at the both sides of said sample container so as to face each other,- and
  • said sample container has a shape that exhibits a lens effect by which the light emitted by the light source is collected on said light detector element.
  • a fourth aspect of the present invention is the optical fuel sensor according to the third aspect of the present invention, wherein
  • said sample container has a cylindrical shape and said light source and said light detector element are placed so as to face the curved surface of said
  • a fifth aspect of the present invention is the optical fuel sensor according to any one of the first to PC17JP2010/054903
  • said light source is an LED that shows the peak intensity within the wavelength band from 420 nm to 520 nm.
  • a sixth aspect of the present invention is the optical fuel sensor according to any one of the first to fifth aspects of the present invention, wherein said light detector element is a photodiode that shows the peak sensitivity within the wavelength band from 500 nm to 700 nm.
  • light having a wavelength within a band from 420 nm to 520 nm is irradiated to the fuel accommodated in the sample container.
  • the fuel that is subjected to the light is once excited so as to radiate light having an intensity and a wavelength distribution corresponding to the
  • the optical fuel sensor according to the present invention can generate stably and precisely an output corresponding to the fuel components without being largely influenced, by an intensity of the light arriving at the fuel.
  • the fuel supplied to the engine from the fuel pump flows through the sample container. According to the present invention, therefore, it is possible to obtain a sensor output corresponding to the components of the fuel that is actually supplied to the engine.
  • light emitted from the light source is collected on the photo detector element by the lens effect of the sample container.
  • Degree of the light collection changes depending on a refractive index of the fuel accommodated in the sample container.
  • the reflective index of the fuel changes depending on components of the fuel . Accordingly, the degree of the light collection accords with the
  • the present invention can provide 10 054903
  • a remarkable lens effect can be generated by a simple construction by configuring the sample container to be a cylindrical shape.
  • a light source having a desired luminescence property can be implemented with a low cost by using an LED.
  • a light detector element having a desired light receiving property can be implemented with a low cost by using a photodiode .
  • Fig. 1 is a diagram for explaining the configuration of an optical fuel sensor according to a first embodiment of the present invention
  • Fig. 2 is a block diagram of a fuel component
  • Fig. 3 is a circuit diagram of an amplifier circuit which is a part of the fuel component detection system P T/JP2010/054903
  • Fig. 4 is a diagram showing a relation between an excitation wavelength (a wavelength of an irradiation light) and a radiation wavelength (a wavelength of a light emitted from an excited fuel) shown by diesel;
  • Fig. 5 is a diagram showing a luminescence property of the LED included in the fuel sensor shown in Fig. 1;
  • Fig. 6 is a diagram showing a light receiving property of the photodiode included in the fuel sensor shown in Fig. 1;
  • Fig. 7 is a diagram for explaining the lens effect of the sample container included in the fuel sensor shown in Fig. 1;
  • Fig. 8 shows a relation between fuel components and sensor outputs obtained by an actual measurement using a sample container of a rectangular shape ;
  • Fig. 9 shows a relation between fuel components and sensor outputs obtained by an actual measurement using a sample container of a cylindrical shape.
  • Fig. 1 is a diagram for explaining the configuration of an optical fuel sensor according to a first embodiment of the present invention.
  • the fuel sensor 10 according to of the present embodiment is used while being placed on a vehicle in order to detect components of fuel on the vehicle .
  • the fuel sensor 10 shown in FIG. 1 includes a housing 12.
  • the housing 12 is equipped with two connection mouths 14 andl6.
  • the connection mouth 14 of one side is connected to a fuel passage 18 that is connected to a fuel pump (not shown) .
  • the other connection mouth 16 is connected to a fuel passage 20 that is connected to an injector (not shown) installed in an engine.
  • the housing 12 accommodates a sample container 22.
  • the sample container 22 is made of a material that has a superior corrosion resistance for fuel and being capable of PC17JP2010/054903
  • the sample container 22 is made of a glass material, concretely.
  • the sample container 22 is configured so as to have a
  • the sample container 22 is filled with fuel that is supplied to the engine from the fuel pump during the operation of the vehicle.
  • the housing 12 also accommodates an LED 24 that faces to the side surface (curved surface part) of the sample container 22.
  • a photodiode (PD) 26 is placed at the position opposed to the LED24 so that the sample container 22 is located between the LED 24 and the PD 26.
  • the LED is capable of emitting light having a predetermined wavelength band whose center is 470 nm toward the sample container 22.
  • the PD 26 is capable of converting light within a predetermined wavelength band whose center is 520 nm that is generated at the side of the sample container 22 to an electrical signal.
  • the LED 24 and PD 26 are
  • Fig. 2 is a block diagram of a fuel component
  • the block shown with "light source” in Fig. 2 corresponds to the LED 24.
  • the block shown with “Sample” corresponds to the sample container 22 being filled with fuel.
  • the block shown with “photo detector” corresponds to the PD 26.
  • Multimeter are constructed in the ECU30.
  • the LED 24 (light source) is supplied with electric power from the Energy source32.
  • the LED 24 emits light toward the sample container 22 (Sample) upon receiving the electric power.
  • Light radiated from the sample container 22 is converted into an electrical signal by the PD 26 (photo detector) so as to be supplied to the amplifier circuit 34 in the ECU30.
  • the amplifier circuit34 amplifies the signal so as to supplies it to the
  • Multimeter36 in which an intensity of the amplified signal is detected.
  • Fig. 3 is a circuit diagram of an amplifier circuit shown in Fig. 2. The front stage of the circuit shown in P T/JP2010/054903
  • Fig. 3 acts as a low pass filter.
  • the rear stage of the circuit acts as an amplifier.
  • the low pass filter shown in FIG. 3 can remove a noise sufficiently from the output of the PD 26.
  • the amplifier circuit34 therefore, can output an amplified signal in which affect of noise is largely suppressed.
  • PAHs poly-aromatics
  • the molecule radiates light having a longer wavelength compared to that of the incident light during the above process . Accordingly, when the light having the specific wavelength is continuously irradiated to the PAHs oil products, light of a specific wavelength band that is longer than the specific wavelength is continuously
  • excitation wavelength the wavelength of the light radiated from the PAHs oil products is referred to a “radiation wavelength” .
  • Fig. 4 shows a relation between an excitation wavelength and a radiation wavelength shown by diesel.
  • a plurality of solid line loops shown in Fig. 4 are contour lines of intensities of lights emitted by diesel.
  • diesel emits radiation light of a radiation wavelength band about from 500nm to 700nm for an excitation wavelength band from 420nm to 520nm.
  • the peak intensity of the radiation light appears at the vicinity of 600 nm radiation wavelength when light of about 470 nm excitation wavelength is irradiated.
  • excitation/radiation relation that is similar to that shown in Fig. 4.
  • excitation/radiation relation varies depending on composition or components ratio of a PAHs oil product.
  • PAHs oil products including
  • PAHs oil products including the same components but having different components ratios also show similar but different excitation/radiation relations, respectively. Accordingly, difference between included components or difference between components ratios of PAHs oil products can be detected by observing the light radiated within the PC17JP2010/054903
  • wavelength band from 500 nm to 700 nm as a result of irradiation of light within the wavelength band from 420 nm to 520 nm to the PAHs oil products.
  • the fuel sensor 10 according to the present
  • the LED 24 that is expected to radiate excitation light is given a property for
  • the PD 26 that is expected to detect radiation light is given a property so as to have higher sensitivity for the light within the wavelength band from 500nm to 700nm than that for the outside of it.
  • Fig. 5 shows a luminescence property of an L- 7104PBC-ZLED used as the LED24 in the present embodiment.
  • the L- 7104PBC- LED shows the peak intensity at the vicinity of 470nm and having a wavelength band that is narrow enough (from the vicinity of 430nm to the vicinity of 490nm) .
  • Fig. 6 shows a light receiving property of an EPD- 520-5/0.5 used as the PD 26 in the present embodiment. AS shown in Fig. 6, the EPD-520-5/0.5 shows the peak
  • Fig. 7 is a diagram schematically showing the sample container 22, theLED24 and the PD 26 in the fuel sensor 10. It is assumed that the sample container 22 is filled with fuel flowing toward the engine. As shown in Fig. 7, the LED24 is placed so as to face the curved surface (the side surface of the cylindrical shape) of the sample container 22. In this situation, the sample container and the fuel act as a convex lens for the light from the LED 24.
  • the PD 26 is placed so as to face the curved surface of the sample container 22. Accordingly, the sample container and the fuel also act as a convex lens for the light traveling toward the PD 26.
  • Refractive index of the fuel varies depending on the P T/JP2010/054903
  • the effect of the convex lens achieved by the sample container 22 filled with fuel may vary depending on the quality of the fuel.
  • the light paths of two kinds shown in Fig. 7 indicate examples of light paths that may be implemented, respectively, due to difference of fuel.
  • the output of the PD 26 rises as the radiation light from the fuel is collected by the lens effect whereas being lowered as the light is scattered.
  • the relative position of the sample container 22 and the PD 26 is determined so that the radiation light from the fuel is corrected on the PD 26 most efficiently when predetermined standard fuel that is expected to be used on the vehicle is used so that the output of the PD 26 is maximized when the standard fuel is employed.
  • the refractive index of the fuel has a 0 054903
  • the present invention can superimpose doubly the affect of the quality of the fuel on the output of the PD 26. Difference of quality of fuel appears remarkably in such an output. Thus, the difference of the quality of fuel can be easily
  • Fig. 8 shows a relation between fuel components and output of the PD 26 obtained by an actual measurement using a sample container of a rectangular shape .
  • Fig. 9 shows a relation obtained by an actual measurement using a sample container of a rectangular shape .
  • the distance between the sample and the light source (LED) is 2 cm.
  • photodiode is also 2 cm. Further, the temperature is twenty five degrees Celsius.
  • the result shown in Fig. 9 is more stable and superior in repeatability than the other is. It is conceivable that the difference of the stability, i.e., the difference of the repeatability is depending on the difference of the lens effect due to the difference of shapes of the sample containers. More particularly, it is conceivable that the light is efficiently focused on the light detector element (PD) in the measurement shown in Fig. 9, thereby preventing measurement errors from arising.
  • the fuel sensor 10 of the present embodiment can suppress enough the variation 3
  • the fuel sensor 10 according to the present
  • the fuel sensor 10 can be equipped on a vehicle for the purpose of detecting the quality of fuel on the vehicle.
  • the fuel sensor 10 produces an output that corresponds to the property of fuel based on an intensity of radiation light from the fuel that is excited by incident light.
  • the intensity of the radiation light is hard to be affected by the intensity itself of the incident light compared to the intensity of transmitted light of the incident light.
  • the fuel sensor 10 can produce a stable output without receiving large affect from external disturbances such as dirt in the transmission path of the incident light that affect the intensity itself of the incident light.
  • a result like the result shown in Fig. 9 can be obtained for blended fuels as follows :
  • Blended fuel with diesel and synthetic fuel 4. Blended fuel with diesel and synthetic fuel;
  • Blended fuel with diesel and decomposed gas fuel .
  • the fuel sensor 10 can produce an output corresponding to the difference of components ratio as for blended fuel including three or more kinds of components, like as for the blended fuel of two kinds components.
  • optimization based on a ratio of each component in fuel may be required in controls executed on a vehicle.
  • the fuel sensor 10 can provide an output
  • the output of the fuel sensor 10 according to the present embodiment shows a remarkable change when a wrong component is mixed with proper fuel.
  • fuel of inferior quality may be on the market in some cases.
  • the output of the fuel sensor 10 shows a remarkable change when a component that is not expected to be used primarily is mixed with fuel.
  • a system for generating an alert for the inferior quality fuel can be realized according to the fuel sensor 10.
  • the light source of the fuel sensor 10 is not limited to this.
  • a laser emitting light of the required excitation wavelength band and a light source equipped with a filter passing only the light of the excitation wavelength band may be used as substitution of the LED 24.
  • the PD 26 is used as the light detector element in the above described first embodiment, the present invention is not limited to this.
  • a light detector element such as a CMOS or CCD equipped with a filter passing only the light of the required radiation wavelength may be used.
  • the cylindrical shape is given to the sample container 22 in the above described first embodiment
  • the present invention is not limited to this . That is, the sample container 22 may have other shape as long as the required lens effect is achieved. In addition, any shape including the rectangular shape can be used in a case where the lens effect is not required.
  • Part of light having a wavelength that should be absorbed may be mixed into a signal to be measured when signal processing of the excitation wavelength light is performed.

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  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Molecular Biology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

Détecteur optique de carburant (10) comprenant un récipient pour l'échantillon (22) destiné à contenir le carburant pendant le passage d'une lumière ayant une longueur d'onde de 420 à 700 nm. Une source de lumière (24) est utilisée pour émettre une lumière ayant une intensité dans une bande de longueurs d'ondes de 420 à 520 nm plus forte qu'en-dehors de celle-ci de façon à irradier le récipient pour l'échantillon (22) avec la lumière. Un élément détecteur de lumière (26) est également utilisé pour recevoir la lumière irradiée provenant du récipient pour l'échantillon (22) de façon à générer un résultat de sortie à réception de la lumière. Le détecteur de lumière (26) possède une sensibilité dans une bande de longueurs d'ondes de 500 à 700 nm plus forte qu'en-dehors de celle-ci.
PCT/JP2010/054903 2010-03-16 2010-03-16 Détecteur optique de carburant WO2011114538A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/054903 WO2011114538A1 (fr) 2010-03-16 2010-03-16 Détecteur optique de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/054903 WO2011114538A1 (fr) 2010-03-16 2010-03-16 Détecteur optique de carburant

Publications (1)

Publication Number Publication Date
WO2011114538A1 true WO2011114538A1 (fr) 2011-09-22

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Country Status (1)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01119740A (ja) * 1987-11-02 1989-05-11 Mitsubishi Electric Corp 内燃機関用アルコールセンサ
JPH0249144A (ja) * 1988-08-11 1990-02-19 Ngk Spark Plug Co Ltd 混合液体の液体混合比検出器
US5198871A (en) * 1991-06-18 1993-03-30 Southwest Research Institute Laser-induced-fluorescence inspection of jet fuels
JPH05133886A (ja) * 1991-11-13 1993-05-28 Ngk Spark Plug Co Ltd 燃料性状検出装置
US20060263893A1 (en) * 2005-05-02 2006-11-23 Southwest Research Institute Method for determination of fuel thermal stability
JP2008107098A (ja) 2006-10-23 2008-05-08 Toyota Motor Corp 燃料性状検出装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01119740A (ja) * 1987-11-02 1989-05-11 Mitsubishi Electric Corp 内燃機関用アルコールセンサ
JPH0249144A (ja) * 1988-08-11 1990-02-19 Ngk Spark Plug Co Ltd 混合液体の液体混合比検出器
US5198871A (en) * 1991-06-18 1993-03-30 Southwest Research Institute Laser-induced-fluorescence inspection of jet fuels
JPH05133886A (ja) * 1991-11-13 1993-05-28 Ngk Spark Plug Co Ltd 燃料性状検出装置
US20060263893A1 (en) * 2005-05-02 2006-11-23 Southwest Research Institute Method for determination of fuel thermal stability
JP2008107098A (ja) 2006-10-23 2008-05-08 Toyota Motor Corp 燃料性状検出装置

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