FR2858400A1 - Motor vehicle tank fuel gauge, has low-pass filtering unit to filter tank level signal coming from piezoelectric sensor, and having time constant function of acceleration data of vehicle for delivering filtered signal - Google Patents
Motor vehicle tank fuel gauge, has low-pass filtering unit to filter tank level signal coming from piezoelectric sensor, and having time constant function of acceleration data of vehicle for delivering filtered signal Download PDFInfo
- Publication number
- FR2858400A1 FR2858400A1 FR0309342A FR0309342A FR2858400A1 FR 2858400 A1 FR2858400 A1 FR 2858400A1 FR 0309342 A FR0309342 A FR 0309342A FR 0309342 A FR0309342 A FR 0309342A FR 2858400 A1 FR2858400 A1 FR 2858400A1
- Authority
- FR
- France
- Prior art keywords
- vehicle
- time constant
- low
- piezoelectric sensor
- filtering unit
- 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.)
- Granted
Links
- 230000001133 acceleration Effects 0.000 title claims abstract description 17
- 239000000446 fuel Substances 0.000 title claims abstract description 15
- 238000001914 filtration Methods 0.000 title claims abstract description 8
- 238000012885 constant function Methods 0.000 title claims abstract 3
- 238000005259 measurement Methods 0.000 description 4
- 239000002828 fuel tank Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
- G01D3/032—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure affecting incoming signal, e.g. by averaging; gating undesired signals
-
- 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
- G01F23/80—Arrangements for signal processing
- G01F23/802—Particular electronic circuits for digital processing equipment
- G01F23/804—Particular electronic circuits for digital processing equipment containing circuits handling parameters other than liquid level
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/964—Piezoelectric touch switches
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (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
La présente invention concerne une jauge de carburant pour réservoirThe present invention relates to a fuel gauge for a tank
de véhicule automobile.of a motor vehicle.
Les jauges de carburant de ce type sont bien connues dans l'état de la technique et comportent la plupart du temps un bras de jauge dans le réservoir et un capteur correspondant de hauteur de carburant dans le réservoir. Fuel gauges of this type are well known in the state of the art and usually comprise a gauge arm in the tank and a corresponding sensor of fuel height in the tank.
Mais ces structures présentent un certain nombre d'inconvénients, notamment au niveau de leur complexité, de l'encombrement et de leur coût. But these structures have a number of disadvantages, especially in terms of their complexity, size and cost.
Le but de l'invention est donc de résoudre ces problèmes. The object of the invention is therefore to solve these problems.
A cet effet, I'invention a pour objet une jauge de carburant pour 10 réservoir de véhicule automobile, caractérisée en ce qu'elle comporte un capteur piézoélectrique de mesure de la hauteur de carburant dans le réservoir et des moyens de filtrage passe-bas du signal de hauteur issu de ce capteur, présentant une constante de temps fonction de données d'accélération du véhicule et de caractéristiques de celui-ci, pour délivrer un signal de hauteur filtrée. For this purpose, the subject of the invention is a fuel gauge for a tank of a motor vehicle, characterized in that it comprises a piezoelectric sensor for measuring the fuel height in the tank and low-pass filtering means of the fuel tank. height signal from this sensor, having a time constant depending on vehicle acceleration data and characteristics thereof, for outputting a filtered height signal.
Selon une autre caractéristique, la constante de temps du filtre passebas est déterminée par la relation: T = X+l O.Y.y, où Xet Ysont des coefficients compris entre 0 et 254 définis en fonction de caractéristiques du véhicule et r est déterminée par la relation: y=_ /2+ 7 y2, où 7x et 7y représentent respectivement les accélérations longitudinale et transversale du véhicule. According to another characteristic, the time constant of the low-pass filter is determined by the relation: T = X + 1 OYy, where X and Y are coefficients between 0 and 254 defined according to characteristics of the vehicle and r is determined by the relation: y = _ / 2 + 7 y2, where 7x and 7y respectively represent the longitudinal and transverse accelerations of the vehicle.
Selon une autre caractéristique, les coefficients Xet Yprésentent des valeurs par défaut de 30 et 120 respectivement. According to another characteristic, the coefficients X and Y have default values of 30 and 120 respectively.
Enfin, selon une autre caractéristique, le capteur présente une fréquence de mesure de hauteur égale à I hertz. Finally, according to another characteristic, the sensor has a measurement frequency of height equal to I hertz.
L'invention sera mieux comprise à la lecture de la description qui va 25 suivre, donnée uniquement à titre d'exemple et faite en se référant au dessin annexé, qui représente un schéma synoptique illustrant la structure générale d'une jauge de carburant selon l'invention. The invention will be better understood on reading the description which will follow, given solely by way of example and with reference to the appended drawing, which represents a block diagram illustrating the general structure of a fuel gauge according to FIG. 'invention.
On a en effet illustré sur cette figure un réservoir de carburant pour véhicule automobile désigné par la référence générale 1. It has in fact illustrated in this figure a fuel tank for a motor vehicle designated by the general reference 1.
Selon l'invention, ce réservoir de carburant est associé à un capteur piézoélectrique désigné par la référence générale 2, permettant de mesurer la hauteur de carburant dans le réservoir. According to the invention, this fuel tank is associated with a piezoelectric sensor designated by the general reference 2, for measuring the height of fuel in the tank.
On sait en effet que le temps de réponse d'un tel capteur piezoélectrique est très rapide et que sa précision est grande. Indeed, it is known that the response time of such a piezoelectric sensor is very fast and that its accuracy is great.
De plus, un tel capteur piezoélectrique n'est pas assujetti aux déplacements de carburant dans le réservoir et n'est donc pas perturbé par son énergie cinétique. In addition, such a piezoelectric sensor is not subject to fuel movements in the tank and is not disturbed by its kinetic energy.
Il convient cependant d'associer à ce capteur piezoélectrique des 5 moyens de filtrage passe-bas dont la constante de temps est asservie à des données d'accélération du véhicule. It is however appropriate to associate with this piezoelectric sensor low-pass filtering means whose time constant is slaved to acceleration data of the vehicle.
En effet, lorsque le véhicule est soumis à des accélérations suivant ses différents axes, le niveau de carburant devient non significatif. Il convient donc de filtrer les mesures réalisées pendant les phases d'accélération de ce 10 véhicule. Indeed, when the vehicle is subjected to acceleration along its different axes, the fuel level becomes insignificant. It is therefore necessary to filter the measurements made during the acceleration phases of this vehicle.
A cet égard, on pourra noter que l'accélération suivant l'axe z du véhicule est peu significative et sera donc considérée comme très inférieure aux accélérations suivant les axes x et y de celui-ci, c'est-àdire les axes longitudinal et transversal du véhicule. L'accélération suivant l'axe z du véhicule pourra donc 15 être ignorée. In this respect, it may be noted that the acceleration along the z-axis of the vehicle is insignificant and will therefore be considered to be much lower than the accelerations along the x and y axes thereof, ie the longitudinal axes and transversal of the vehicle. The acceleration along the z-axis of the vehicle can therefore be ignored.
La mesure issue du capteur piezoélectrique est une hauteur de carburant, par exemple en millimètres. Cette hauteur mesurée par exemple toutes les secondes, c'est-à-dire avec une fréquence de mesure du capteur de 1 hertz, est alors délivrée à un filtre passe-bas tel que le filtre désigné par la 20 référence générale 3 sur la figure, ce filtre présentant une constante de temps Z fonction de données d'accélération du véhicule. The measurement resulting from the piezoelectric sensor is a fuel height, for example in millimeters. This height, measured for example every second, that is to say with a measurement frequency of the sensor of 1 Hz, is then delivered to a low-pass filter such as the filter designated by the general reference 3 in FIG. , this filter having a time constant Z acceleration data function of the vehicle.
Cette constante de temps peut alors être exprimée selon la relation r= X+ 1O.Y., dans laquelle les coefficients X et Y sont des coefficients compris entre 0 et 254 et choisis pour être adaptés aux caractéristiques du véhicule et en 25 particulier aux caractéristiques de puissance du moteur de celui-ci, un moteur puissant se traduisant en effet par de fortes accélérations possibles du véhicule. This time constant can then be expressed according to the relation r = X + 10Y., In which the coefficients X and Y are coefficients between 0 and 254 and chosen to be adapted to the characteristics of the vehicle and in particular to the characteristics of the vehicle. motor power of it, a powerful motor resulting in effect by possible high acceleration of the vehicle.
Ces valeurs sont donc pré-établies expérimentalement en fonction de chaque type de véhicule. These values are thus pre-established experimentally according to each type of vehicle.
Par défaut, ces coefficients X et Ypourront respectivement prendre 30 des valeurs de 30 et de 120 par exemple. By default, these coefficients X and Y may respectively take values of 30 and 120, for example.
Dans la formule précédente, y est une information d'accélération du véhicule suivant les axes x et y de ce celui-ci, c'est-à-dire les axes longitudinal et transversal. In the preceding formula, y is an acceleration information of the vehicle along the x and y axes thereof, that is to say the longitudinal and transverse axes.
y peut être déterminée selon la relation: y _ Jy2 + ;y2 où x et sont les accélérations longitudinale et transversale du véhicule. y can be determined according to the relation: y _ Jy2 +; y2 where x and are the longitudinal and transverse accelerations of the vehicle.
Ceci est également illustré sur cette figure où l'on peut constater que 5 le filtre passe-bas 3 reçoit alors en entrée les valeurs des coefficients X et Yde moyens d'établissement de ceux-ci, par exemple 4 et 5 respectivement, et les accélérations longitudinale et transversale du véhicule x et yde capteurs accélérométriques correspondants, par exemple 6 et 7. This is also illustrated in this figure, where it can be seen that the low-pass filter 3 then receives as input the values of the coefficients X and Yde of means of establishment thereof, for example 4 and 5 respectively, and the longitudinal and transverse accelerations of the vehicle x and y of corresponding accelerometric sensors, for example 6 and 7.
La sortie de ce filtre passe-bas 3 est donc un signal représentatif de la 10 hauteur de carburant dans le réservoir après filtrage. The output of this low-pass filter 3 is therefore a signal representative of the fuel height in the tank after filtering.
Bien entendu, d'autres modes de réalisation peuvent être envisagés et l'on conçoit qu'une telle structure présente un certain nombre d'avantages par rapport aux structures des jauges de l'état de la technique, notamment au niveau de sa simplicité et de son coût. Of course, other embodiments can be envisaged and it is conceivable that such a structure has a certain number of advantages over the structures of the gauges of the state of the art, in particular with regard to its simplicity and of its cost.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0309342A FR2858400B1 (en) | 2003-07-29 | 2003-07-29 | FUEL GAUGE FOR MOTOR VEHICLE TANK |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0309342A FR2858400B1 (en) | 2003-07-29 | 2003-07-29 | FUEL GAUGE FOR MOTOR VEHICLE TANK |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2858400A1 true FR2858400A1 (en) | 2005-02-04 |
| FR2858400B1 FR2858400B1 (en) | 2005-11-25 |
Family
ID=34043653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0309342A Expired - Fee Related FR2858400B1 (en) | 2003-07-29 | 2003-07-29 | FUEL GAUGE FOR MOTOR VEHICLE TANK |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2858400B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3105404A1 (en) * | 2019-12-20 | 2021-06-25 | Renault S.A.S | Device for estimating the volume of liquid and method of implementing the device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2770054A1 (en) * | 1997-10-17 | 1999-04-23 | Magneti Marelli France | Filter for an automobile fuel gauge or other electronic signal |
| US6253607B1 (en) * | 1997-05-14 | 2001-07-03 | Hans-Jorg Dau | Fill level measuring system |
| FR2808085A1 (en) * | 2000-04-20 | 2001-10-26 | Peugeot Citroen Automobiles Sa | System for measuring the level of fuel in motor vehicle fuel tank includes level measuring device and filtering unit that estimates fuel level according to signal from level measuring device |
-
2003
- 2003-07-29 FR FR0309342A patent/FR2858400B1/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6253607B1 (en) * | 1997-05-14 | 2001-07-03 | Hans-Jorg Dau | Fill level measuring system |
| FR2770054A1 (en) * | 1997-10-17 | 1999-04-23 | Magneti Marelli France | Filter for an automobile fuel gauge or other electronic signal |
| FR2808085A1 (en) * | 2000-04-20 | 2001-10-26 | Peugeot Citroen Automobiles Sa | System for measuring the level of fuel in motor vehicle fuel tank includes level measuring device and filtering unit that estimates fuel level according to signal from level measuring device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3105404A1 (en) * | 2019-12-20 | 2021-06-25 | Renault S.A.S | Device for estimating the volume of liquid and method of implementing the device |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2858400B1 (en) | 2005-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |
Effective date: 20140331 |