WO2007106964A1 - Capteur magneto-resistif de niveau de carburant pour vehicules automobiles et similaires - Google Patents

Capteur magneto-resistif de niveau de carburant pour vehicules automobiles et similaires Download PDF

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Publication number
WO2007106964A1
WO2007106964A1 PCT/BR2007/000068 BR2007000068W WO2007106964A1 WO 2007106964 A1 WO2007106964 A1 WO 2007106964A1 BR 2007000068 W BR2007000068 W BR 2007000068W WO 2007106964 A1 WO2007106964 A1 WO 2007106964A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
magnetic sensors
sensor
similar
resistive
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/BR2007/000068
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English (en)
Inventor
Antonio Carlos Silveira Melo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rescigno Sergio Ricardo
Original Assignee
Rescigno Sergio Ricardo
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 Rescigno Sergio Ricardo filed Critical Rescigno Sergio Ricardo
Publication of WO2007106964A1 publication Critical patent/WO2007106964A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/56—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements
    • G01F23/62—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using elements rigidly fixed to, and rectilinearly moving with, the floats as transmission elements using magnetically actuated indicating means

Definitions

  • LEVEL SENSOR FOR AUTOMOTIVE VEHICLES AND SIMILAR particularly a fuel level sensor for measuring the fuel level in the tank of automotive vehicles and similar, this sensor having no rod, thus it is not invasive in order to avoid the wear of the resistive element, including also a float provided with a magnet inside it, with vertical movement along the sensor track, by means of guides, such track consisting of an electronic board basically consisting of magnetic sensors and resistors.
  • a vehicle may be submitted to different types of climate, i.e., variable temperatures. Depending on the region, the temperature may vary from some negative Celsius degrees up to various tenths of positive Celsius degrees inside the fuel tank. Besides chemical strength and resistance to temperature gradients, it is necessary to consider the mechanical strength of the assembly.
  • the level sensor has a deficient sealing on the mechanical components, the fuel may infiltrate inside the sensor and reach the electronic circuit and may cause early deterioration and, due to the presence of electrical current, even when reduced, a combustion hazard. Reliability — for a correct measurement of the fuel level inside the tank, the level sensor shall be accurate; with an appropriate resolution for the application as well as repeatability assurance.
  • the sensor In order to assure the accuracy or precision of the measurement, the sensor shall be calibrated in compliance with a calibration curve corresponding to the respective tank where it will be used. This curve, directly related to the tank format and the particulars of the fuel level indicator, varies according to each vehicle model / manufacturer.
  • the resolution of the level sensor determines how many reading points the sensor shall have. Thus, a better resolution will have more reading points available in the panel and will have better processing for the signal corresponding to the fuel level in the tank, conducted by the electronic control unit of the vehicle.
  • the repeatability is a determinant factor to be considered to assure that the measurements, corresponding to a certain level, will not change with time, due to any of the already commented inconveniences.
  • a fuel level sensor besides complying with the quality and reliability requirements, shall have low production cost; shall allow the automation of the manufacture process, due to the large demand; shall allow facilitated logistics, for raw material and finished product, and, above all, shall be compatible with the fuel tanks of the manufactures vehicles.
  • Fuel sensors shall convert the fuel level of the tank into a corresponding electrical resistance in order to allow the interpretation of the signal by the indicator and the electronic control unit of the vehicle.
  • the used method includes a float coupled to the end of a rod, the other end shall be coupled to conductive brush system running along a resistive track on an electronic circuit board.
  • the fuel levels changes in the tank move the float causing an angular movement of the rod, which on its turn, changes the position of the conductive brush on the resistive track, due to the change in the electrical resistance.
  • a third disadvantage is relative to the float containing the magnet, which moves along the electronic circuit shaft, besides the longitudinal movement (up or down) it is also subject to radial movement, i.e., around the housing of the mentioned circuit, needing a double magnet to actuate the circuit in any radial position.
  • the main aspect of the innovation is the fact that this is a fuel level sensor with no rod, including a float with a magnet inside it that moves vertically along the sensor track by means of guides, provided with an electronic circuit board inside the sensor.
  • the float position relative to the sensor track corresponds to the fuel level inside the tank.
  • the change in the electrical resistance is due to the interaction of the magnetic field of the float magnet and magnetic sensors positioned horizontally along all the vertical length of the electronic board of the level sensor.
  • Each magnetic sensor has one of its terminals connected to the node point of a series connected resistor set, its other terminal is connected to the other magnetic sensors.
  • Figure 1 Schematic electric drawing of the magnetic-resistive fuel level sensor for automotive vehicles and similar;
  • Figure 2 Side view showing the main components of the magnetic-resistive fuel level sensor for automotive vehicles and similar, with base details;
  • Figure 3 Front view showing the main components of the magnetic-resistive fuel level sensor for automotive vehicles and similar;
  • Figure 4 Lower view of the magnetic-resistive fuel level sensor for automotive vehicles and similar;
  • Figure 5 Upper view of the magnetic-resistive fuel level sensor for automotive vehicles and similar
  • Figure 6 Detail of the float of the magnetic-resistive fuel level sensor for automotive vehicles and similar.
  • the "MAGNETIC RESISTIVE FUEL LEVEL SENSOR FOR AUTOMOTIVE VEHICLES AND SIMILAR”, object of this Patent application, is applicable to fuel tanks of vehicles and similar, with the particular features of having magnetic-resistive actuation by means of a float (1) with an inserted magnet (2), which is displaced along appropriate guides (3) that, in case of variation in the fuel volume inside the tank, is displaced vertically in parallel to an electronic board (4) containing magnetic sensors (5) and resistors (6), all this is not invasive since the sensor does not have a rod, in order to avoid the wear of the resistive
  • the fuel level sensor (S) for general vehicles has magnetic-resistive actuation; consisting of an electronic circuit board (4) containing magnetic sensors (5) located horizontally along all the extension of the electronic board (4), each magnetic sensor (5) has one of its terminals connected to the node point of a series connected resistor set (6), with the other terminal connected to the other magnetic sensors (5).
  • the connection terminals (T) of the magnetic sensors (5) since it is resistive, have no polarity for connection.
  • the electronic board (4) has a housing (7) in an appropriate material to withstand the adverse conditions of the fuel means, provided with a standard fitting system ideal for the pump where it will be installed, besides guides (3) located in front of the electronic board (4), where the float (1) will move.
  • the mentioned float (1) with semi-cylindrical format, is manufactured in low density material, including a magnet (2) inside it, able to activate the magnetic sensors (5) of the electronic board (4).
  • This float (1) format does not allow its rotation relative to the guide (3), assuring the correct positioning of the magnet (2) relative to the magnetic sensors (5).
  • the actuation of the magnetic sensor (5) at a certain position is caused by the magnetic field of the magnet (2) that changes the output electrical resistance by the action of the magnetic sensors (5), to a corresponding value.
  • the number of magnetic sensors (5) placed along the electronic circuit board (4) is determined by the. desired resolution, this being specified together with the manufacturer of the vehicle.
  • the accuracy of the level sensor is assured by the calibration of each resistor (6) of the electronic board (4).
  • the minimum number of resistors (6) of the level sensor is determined by the equation n + 1, where "n" is the number of magnetic sensors (5) provided in the electronic board (4) in accordance with the resolution.
  • n is the number of magnetic sensors (5) provided in the electronic board (4) in accordance with the resolution.
  • more than one resistor (6) may be interconnected between each magnetic sensor (5) in order to assure the correct power dissipation.
  • the magnetic sensors (5) are positioned horizontally along all the vertical length of electronic circuit board (4). Even though the ideal is to use equal distances between each magnetic sensor (5), this . distance may be changed if it is necessary to increase or reduce the resolution of specific ranges of the level sensor.
  • the correct intensity of the magnetic field shall be assured by magnetization and calibration methods.
  • the only position where there shall be no activation of magnetic sensors is the one equivalent to an empty tank, the electrical resistance being equivalent to the sum of the values of all resistor of the series connected circuit.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

Capteur magnéto-résistif de niveau de carburant pour véhicules automobiles et similaires, applicable aux réservoirs à carburant de véhicules et similaires, se distinguant par l'action magnéto-résistive obtenue au moyen d'un flotteur (1) doté d'un aimant (2) inséré se déplaçant le long de guides (3) appropriés et qui, en cas de variation de volume à l'intérieur du réservoir, est déplacé verticalement en parallèle avec une carte (4) électronique contenant des capteurs (5) magnétiques et des résistances (6), tout cela s'effectuant de façon non invasive puisque le capteur ne possède pas de tige afin d'éviter l'usure de l'élément résistif.
PCT/BR2007/000068 2006-03-20 2007-03-20 Capteur magneto-resistif de niveau de carburant pour vehicules automobiles et similaires Ceased WO2007106964A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BRMU8600392 2006-03-20
BRMU8600392-5 2006-03-20

Publications (1)

Publication Number Publication Date
WO2007106964A1 true WO2007106964A1 (fr) 2007-09-27

Family

ID=38521962

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2007/000068 Ceased WO2007106964A1 (fr) 2006-03-20 2007-03-20 Capteur magneto-resistif de niveau de carburant pour vehicules automobiles et similaires

Country Status (1)

Country Link
WO (1) WO2007106964A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009063475A1 (fr) * 2007-11-12 2009-05-22 Pricol Limited Détecteur de niveau de fluide
WO2009063506A3 (fr) * 2007-11-12 2009-07-02 Pricol Ltd Capteur de niveau de liquide
FR3036792A1 (fr) * 2015-05-29 2016-12-02 Snecma Capteur de niveau d'huile

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940212A (ja) * 1982-08-31 1984-03-05 Tokyo Keiso Kk 液位計測装置
US4589282A (en) * 1982-03-29 1986-05-20 Sprague Electric Company Fine resolution liquid level detector
DE3510198A1 (de) * 1985-03-21 1986-09-25 Schittek, Margarete, 2805 Stuhr Verfahren zur messung eines mediumniveaus und einrichtung zur durchfuehrung des verfahrens
JPH11326016A (ja) * 1998-05-13 1999-11-26 Kansei Corp レベル検出装置
JP2000241233A (ja) * 1999-02-18 2000-09-08 Aichi Electric Co Ltd 液面検出装置
JP2001311653A (ja) * 2000-04-28 2001-11-09 Yazaki Corp 液面レベルセンサ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4589282A (en) * 1982-03-29 1986-05-20 Sprague Electric Company Fine resolution liquid level detector
JPS5940212A (ja) * 1982-08-31 1984-03-05 Tokyo Keiso Kk 液位計測装置
DE3510198A1 (de) * 1985-03-21 1986-09-25 Schittek, Margarete, 2805 Stuhr Verfahren zur messung eines mediumniveaus und einrichtung zur durchfuehrung des verfahrens
JPH11326016A (ja) * 1998-05-13 1999-11-26 Kansei Corp レベル検出装置
JP2000241233A (ja) * 1999-02-18 2000-09-08 Aichi Electric Co Ltd 液面検出装置
JP2001311653A (ja) * 2000-04-28 2001-11-09 Yazaki Corp 液面レベルセンサ

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009063475A1 (fr) * 2007-11-12 2009-05-22 Pricol Limited Détecteur de niveau de fluide
WO2009063506A3 (fr) * 2007-11-12 2009-07-02 Pricol Ltd Capteur de niveau de liquide
FR3036792A1 (fr) * 2015-05-29 2016-12-02 Snecma Capteur de niveau d'huile
WO2016193593A1 (fr) * 2015-05-29 2016-12-08 Safran Aircraft Engines Capteur de niveau d'huile
CN107750327A (zh) * 2015-05-29 2018-03-02 赛峰航空器发动机 一种油位传感器
US20180156654A1 (en) * 2015-05-29 2018-06-07 Safran Aircraft Engines Oil level sensor
US10436627B2 (en) 2015-05-29 2019-10-08 Safran Aircraft Engines Oil level sensor
EP3304010B1 (fr) * 2015-05-29 2021-12-15 Safran Aircraft Engines Capteur de niveau d'huile

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