GB2124390A - Fluid measurement - Google Patents
Fluid measurement Download PDFInfo
- Publication number
- GB2124390A GB2124390A GB08320100A GB8320100A GB2124390A GB 2124390 A GB2124390 A GB 2124390A GB 08320100 A GB08320100 A GB 08320100A GB 8320100 A GB8320100 A GB 8320100A GB 2124390 A GB2124390 A GB 2124390A
- Authority
- GB
- United Kingdom
- Prior art keywords
- value
- information
- tank
- delivered
- fluid
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
- G01F9/001—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine with electric, electro-mechanic or electronic means
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Measuring Volume Flow (AREA)
Abstract
In measuring the amount of fluid contained in a tank (10), two values L1, L2 related to the amount of fluid present are calculated, from information provided respectively by a level gauge 11 and a flowmeter 12. A calculating unit 14 resets the second value when the difference between the two values exceeds a given threshold. Also, a factor applied to the flowmeter output is modified depending on the difference existing between the two values. The display 17 displays the second value L2. <IMAGE>
Description
a given threshold, and for modifying the factor K depending on the difference existing between the first and second values L, and L2.
10. A device as claimed in Claim 9, in which said means for measuring the amount of fluid withdrawn from the tank is a flowmeter.
1 A device as claimed in Claim 9 or 10, comprising means for storing the first and second values L1, L2 and means for displaying the second value L2 to represent the amount of fuel present in the tank.
12. A device as claimed in any one of Claims 9 to 11, in which said means for determining said first value L, is arranged to calculated the value (p-1) L0
L,(n)= L,(n1 )+ P P in which: L(n) represents the first value L, at the
moment (n), L,(n--l) represents the first value L, at the
moment (n-1), L0 represents a datum proportional to the
information representative of the level of
fluid delivered by the gauge (11), and
p represents any whole number.
13. A method as claimed in claim 1 and substantially as herein described, for measuring the amount of fluid contained in a tank.
14. A device for measuring the amount of fluid contained in a tank, which device is substantially as herein described with reference to the accompanying drawings.
SPECIFICATION
Fluid measurement
The present invention relates to the measurement of the amount of fluid contained in a tank, particularly the amount of fuel present in the tank of a motor vehicle.
In the motor car field, the important development has been witnessed for some years of apparatus known as "car computers" which are intended to supply the driver with a large number of items of information, including average instantaneous consumption, cruising range, etc. Nevertheless, in order to ensure a correct operation of these apparatus and to facilitate the observation of these, it would be desirable to have available measuring systems which are precise and deliver stable information.
The more conventional devices for measuring the level of the fuel in the tank, such as devices with a float for example, cannot give satisfaction.
Indeed, apart from problems associated with their complexity and poor reliability, these devices are very sensitive to the fluctuations in fuel level owing to disturbances, e.g. due to accelerations of the vehicle.
An attempt has been made to overcome this disadvantage by inserting the float in a tubular element which is disposed vertically and in communication with the tank through a calibrated orifice. Nevertheless, this arrangement proves relatively complex and it is found, in practice, that it does not provide sufficiently stable information.
Other devices have been proposed but these have been set aside particularly because of their high cost and technical complexity.
In accordance with this invention there is provided a method of measuring the amount of fluid contained in a tank, comprising:
(a) measuring the level of the fluid in the tank by means of a gauge,
(b) determining a first value L,(n) related to the amount of fluid present in the tank from a value L0 representing the fluid level provided at a given moment (n) by the gauge and from a first value (L,(n--l)) previously determined,
(c) measuring the amount of fluid withdrawn from the tank per unit of time,
(d) determining a second value L2 related to the amount of fluid present in the tank from the measured flow rate, applying thereto a given factor (K);
(e) comparing the values L1, L2, related to the amount of fluid, as determined in steps (b) and (d);;
(f) resetting the second value L2 to equal the first value L1 each time the difference between these two values L1, L,exceeds a given threshold
X, said second value (L2) then representing the amount of fluid;
(g) modifying the factor K applied to the measured flow rate for the calculation of said second value (L2) in the step (d) depending on the difference existing between the first value L, and
the second value L2; and
(h) repeating the steps (a) to (g).
The embodiment to be described herein is simple, robust, reliable and economical, while providing precise and stable information. In particular it makes use of a gauge and preferably a flowmeter, which devices are completely conventional in themselves. This embodiment enables the contents of the tank to be known in a precise and stable manner to supply the user of the car computer with stable information.
Other characteristics and advantages of the present invention will be apparent on reading the following detailed description with reference to the accompanying drawings, given by way of nonlimiting example, and in which:
Figure 1 is a block diagram of a measuring device according to the present invention;
Figure 2 is a diagrammatic flow chart illustrating the operation of the device according to the present invention;
Figure 3 represents curves which illustrate the various values determined by the device according to the present invention; and
Figures 4a and 4b illustrate the value of the amount of fluid contained in the tank, as calculated by the device according to the present invention, in two particular cases.
As illustrated diagrammatically in Figure 1, the measuring device according to the present invention comprises a gauge 11 to measure the level of the fluid, or liquid, contained in the tank 10 of a vehicle, as well as a flowmeter 12 which measures the amount of fluid withdrawn from the tank per unit of time.
The information delivered by the gauge 11 is applied to a calculating unit 14 by means of an analogue/digital converter 1 3. Of course, it is easy to determine the number of litres of liquid contained in the tank 10, on the basis of the information delivered by the gauge 11, if the dimensions and the shape of the tank 10 are known.
In a similar manner, the pulses delivered by the flowmeter 1 2 and representative of the flow of fuel, are applied to the calculating unit 14. There again, it is possible to determine the number of litres of fuel contained in the tank 10 on the basis of the information supplied by the flowmeter, if the number of litres originally present in the tank 10 is known.
The measuring device according to the present invention likewise comprises two registers of stores 1 5 and 16, connected to the calculating unit 14. The first register 1 5 is adapted to store said first value (L,) of the amount of fluid present in the tank, determined by means belonging to the calculating unit 14, depending on the information representative of the fluid level, delivered by the gauge 11, weighting this information on the basis of a first value previously determined.
The second register 1 6 is adapted to store a second value (L2) of the amount of fluid present in the tank, determined by means likewise belonging to the calculating unit 14, depending on the information (d) representative of the flow of fluid, delivered by the flowmeter 12, by applying a given factor (K) to this information.
As will be apparent on reading the following description, the calculating unit 14 likewise comprises means for comparing the aforesaid two values (L1, L2) of the amount of fluid and means for resetting the second value (L2) when the difference between these values exceeds a given threshold, said resetting means making the second value (L2) equal to the first (L,) in such a manner that the second value represents the amount of fluid present in the tank. On the other hand, the calculating unit 14 comprises means for modifying the factor (K) applied to the information (d) delivered by the fiowmeter 12 for the calculation of the second value, depending on the difference existing between the first (L,) and the second value (L2).
Finally, as illustrated in Figure 1, the device likewise comprises means 1 7 for displaying the second value L2 representative of the amount of fluid present in the tank.
The method of measuring according to the present invention will now be described with reference to the flow chart illustrated in Figure 2.
When voltage is first applied and when the device is reset to zero, illustrated diagrammatically by the first step 50: "L0=L1=L2,,, a value L0 representative of the amount of fluid contained in the tank and calculated by the calculating unit 14 on the basis of the information delivered by the gauge 11 is transferred into the registers 1 5 and 1 6.
As illustrated by the step 51, the calculating unit 14 determines a first value L,(n) of the amount of fluid present in the tank depending on the information representative of the fluid level delivered at a given moment (n) by the gauge, weighting this information on the basis of a first value L, (n-1) determined previously.More precisely, as illustrated in Figure 2, the calculating unit 14 determines said first value L, on the basis of the following formula: (p-1) L0 L1(n)= ------- L,(n--l )+
P P in which:
L1(n) represents the first value L, at the
moment n, L,(n--l) represents the first value L, at the
moment (n-1), L0 represents a datum proportional to the
information representative of the fluid level
delivered by the gauge,
p represents any whole number.
Said first value L,, thus determined, is stored in
the register 1 5 and reactualized sequentially, for
example every second.
By way of non-limiting example, p may be
equal to 1 6 which gives a response time equivalent to 1 6 seconds and causes a lag of 0.2 litre for flows of 50 litres/hour.
As illustrated in Figure 3, in which there is represented a first curve L0 representative of the amount of fluid contained in the tank, determined on the basis of the information delivered by the gauge, as well as a curve L1 representative of said first value, this smoothing effected by the calculating unit 14 eliminates the rapid variations in the values recorded by the gauge 11 and due, in particular, to the displacements and accelerations of the vehicle.
At the step 52, the calculating unit 14 determines a second value L2 of the amount of fluid present in the tank depending on the information d representative of the flow of fluid, delivered by the flowmeter 12, applying a given factor K to this information d.
More precisely, the second value L2 of the amount of fluid present in the tank is determined by the calculating unit 14 on the basis of the following formula: L2(n)=L2(n-1 )-Kd, in which:
L2(n) represents the second value L2 at the
moment n, L2(n-1) represents the second value L2 at the
moment (n-1), d represents the information delivered by the
flowmeter 12, representative of the flow of
fluid,
K represents said factor.
At the step 53, the values L, and L2 determined at the preceding steps 51 and 52 are compared. When the absolute value of the difference between L, and L2 is greater than a given value X, the second value L2 is reset in step 54, making it equal to the first value L,.
Said second value L2 is then representative of the amount of fluid contained in the tank 10 and this second value L2 is displayed, in step 55, by the means 17. The method according to the present invention is then resumed before the step
51 in such a manner as to bring said first L, and second L2 values representative of the
amount of fluid present in the tank 10 constantly up to date.
Naturally, if the difference between the two values L, and L2 is less than said constant X (step
53), the value of L2 determined directly is displayed by the means 17.
By way of non-limiting example, the value X
may be equal to
L2
1+
20
Naturally, this value X may be selected differently
Furthermore, as previously indicated, the
method according to the present invention
consists in modifying the factor K applied to the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
- **WARNING** start of CLMS field may overlap end of DESC **.information (d) representative of the flow of fluid, delivered by the flowmeter 12, by applying a given factor (K) to this information.As will be apparent on reading the following description, the calculating unit 14 likewise comprises means for comparing the aforesaid two values (L1, L2) of the amount of fluid and means for resetting the second value (L2) when the difference between these values exceeds a given threshold, said resetting means making the second value (L2) equal to the first (L,) in such a manner that the second value represents the amount of fluid present in the tank. On the other hand, the calculating unit 14 comprises means for modifying the factor (K) applied to the information (d) delivered by the fiowmeter 12 for the calculation of the second value, depending on the difference existing between the first (L,) and the second value (L2).Finally, as illustrated in Figure 1, the device likewise comprises means 1 7 for displaying the second value L2 representative of the amount of fluid present in the tank.The method of measuring according to the present invention will now be described with reference to the flow chart illustrated in Figure
- 2.When voltage is first applied and when the device is reset to zero, illustrated diagrammatically by the first step 50: "L0=L1=L2,,, a value L0 representative of the amount of fluid contained in the tank and calculated by the calculating unit 14 on the basis of the information delivered by the gauge 11 is transferred into the registers 1 5 and 1 6.As illustrated by the step 51, the calculating unit 14 determines a first value L,(n) of the amount of fluid present in the tank depending on the information representative of the fluid level delivered at a given moment (n) by the gauge, weighting this information on the basis of a first value L, (n-1) determined previously.More precisely, as illustrated in Figure 2, the calculating unit 14 determines said first value L, on the basis of the following formula: (p-1) L0 L1(n)= ------- L,(n--l )+ P P in which: L1(n) represents the first value L, at the moment n, L,(n--l) represents the first value L, at the moment (n-1), L0 represents a datum proportional to the information representative of the fluid level delivered by the gauge, p represents any whole number.Said first value L,, thus determined, is stored in the register 1 5 and reactualized sequentially, for example every second.By way of non-limiting example, p may be equal to 1 6 which gives a response time equivalent to 1 6 seconds and causes a lag of 0.2 litre for flows of 50 litres/hour.As illustrated in Figure 3, in which there is represented a first curve L0 representative of the amount of fluid contained in the tank, determined on the basis of the information delivered by the gauge, as well as a curve L1 representative of said first value, this smoothing effected by the calculating unit 14 eliminates the rapid variations in the values recorded by the gauge 11 and due, in particular, to the displacements and accelerations of the vehicle.At the step 52, the calculating unit 14 determines a second value L2 of the amount of fluid present in the tank depending on the information d representative of the flow of fluid, delivered by the flowmeter 12, applying a given factor K to this information d.More precisely, the second value L2 of the amount of fluid present in the tank is determined by the calculating unit 14 on the basis of the following formula: L2(n)=L2(n-1 )-Kd, in which: L2(n) represents the second value L2 at the moment n, L2(n-1) represents the second value L2 at the moment (n-1), d represents the information delivered by the flowmeter 12, representative of the flow of fluid, K represents said factor.At the step 53, the values L, and L2 determined at the preceding steps 51 and 52 are compared. When the absolute value of the difference between L, and L2 is greater than a given value X, the second value L2 is reset in step 54, making it equal to the first value L,.Said second value L2 is then representative of the amount of fluid contained in the tank 10 and this second value L2 is displayed, in step 55, by the means 17. The method according to the present invention is then resumed before the step51 in such a manner as to bring said first L, and second L2 values representative of the amount of fluid present in the tank 10 constantly up to date.Naturally, if the difference between the two values L, and L2 is less than said constant X (step 53), the value of L2 determined directly is displayed by the means 17.By way of non-limiting example, the value X may be equal to L2 1+ 20 Naturally, this value X may be selected differently Furthermore, as previously indicated, the method according to the present invention consists in modifying the factor K applied to thepossible to provide that, when voltage is again applied to the circuit, the first measurement of LO, determined on the basis of the information delivered by the gauge 11, is transferred to the registers 15 and 16, as an initial value of L, and L2. Such an arrangement renders it possible, in particular, to take into account, in a simple and rapid manner, the sudden variations in the fuel level in the tank 10 which appear, in particular, when said tank 10 is filled.As illustrated in Figure 3, in which the curve L2 appears, if the gauge 11 is placed at a point where the level varies little with the inclination of the car, even if the fuel level varies with the waves, the display effected by the means 1 7 is effected with the precision of the gauge 11 and in a continually decreasing manner which is therefore not disturbing to the driver.On the other hand, it appears that the various breakdowns liable to be encountered with the device according to the present invention can be simply traced. This if the level gauge 11 should be cut off, the indication delivered by the display means 1 7 would oscillate between two values corresponding substantially to the maximum level of the tank 10. Such a phenomenon is due to the fact that at the start, the gauge 11 indicates that the tank 10 is full. This indication is taken into account in the registers 15 and 16.The contents of the register 16 are brought up to date on the basis of the pulses delivered by the flowmeter 12, therefore the information delivered by the display means 17 tend to diminish substantially but is reset to the maximum value as soon as the difference between the registers 1 5 and 1 6 exceeds the aforesaid value X. In a similar manner, if the gauge 11 is short-circuited, the display means 1 7 indicate that the tank 10 is empty. Such a phenomenon is due to the registers 1 5 and 1 6 initially taking into account the information "tank empty" delivered by the gauge 11.As illustrated diagrammatically in Figure 4a, when the flowmeter 12 is cut off or shortcircuited, the information delivered by the display means 1 7 decreases in steps. Such a phenomenon is due to the fact that the contents of the register 16 are not continuously brought up to date on the basis of the information delivered by the flowmeter 12, because this is not delivering any pulses. The register 1 6 is therefore only brought up to date, in steps, when the difference existing between the register 1 5 and the register 1 6 exceeds the aforesaid value X.Finally, as apparent in Figure 4b, when the flowmeter 12 delivers too great a number of pulses per cm3 of fuel withdrawn from the tank 10, the information delivered by the display means 1 7 appears in the form of saw teeth. Such a phenomenon is due to the fact that the contents of the register 1 6 are reduced much more rapidly than the contents of the register 1 5.In such a case, when the difference between the contents of the register 1 5 and the contents of the register 1 6 exceeds the aforesaid value X, the information d delivered by the flowmeter 12, for the calculation of said second value L2, depending on the difference existing between the first value L, and the second value L2.According to a first variant, said modification effected on the factor K applied to the information d delivered by the flowmeter 12 is effected as follows: if the first value L, is lower than the second value L2, the factor K is taken =aK nominal, a relationship in which a is greater than 1 and, for example, sir=1.3.whereas if the first value L, is higher than the second value L2, the factor K is taken =p K nominal, a relationship in which ss is less than 1, for example s=0.7.Such a smoothing prevents any rise of the second value L2 and always tends to bring the second value L2 closer to the first L1, on the average. Of course, the values a and p can be easily determined for this purpose.According to a second variant, the modification effected on the factor K applied to the information d delivered by the flowmeter 12 is carried out by taking the factor K=K nominal L2 L.(1± ) L2 a relationship in which: L2 represents the second value and L, represents the first value.According to a third variant, the modification effected on the factor K applied to the information d delivered by the flowmeter 12 is carried out by taking the factor K=K nominal L2 L, a relationship in which; L2 represents the second value and L, represents the first value.Finally, according to a fourth variant, the modification effected on the factor K applied to the information d delivered by the flowmeter 12 is carried out by taking the factor K=K nominal i+f(L2-L,)] a relationship in which: f (L2-L1) represents a function having the difference existing between the second value L2 and the first value L, as a variable.The contents of the register 1 6 are taken into account for the display, by the means 1 7, of the contents of the tank 10 and for the calculation of the cruising range.In order to avoid the problems associated with the stopping of the engine and the opening of the electric feed circuit, it is possible to envisage transferring the contents of the registers 1 5 and 1 6 to permanent stores. Nevertheless, it is
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8212988A FR2530807B1 (en) | 1982-07-26 | 1982-07-26 | METHOD AND DEVICE FOR MEASURING THE QUANTITY OF FLUID CONTAINED IN A TANK |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8320100D0 GB8320100D0 (en) | 1983-08-24 |
| GB2124390A true GB2124390A (en) | 1984-02-15 |
| GB2124390B GB2124390B (en) | 1985-12-11 |
Family
ID=9276309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08320100A Expired GB2124390B (en) | 1982-07-26 | 1983-07-26 | Fluid measurement |
Country Status (5)
| Country | Link |
|---|---|
| DE (1) | DE3326719A1 (en) |
| ES (1) | ES8501118A1 (en) |
| FR (1) | FR2530807B1 (en) |
| GB (1) | GB2124390B (en) |
| IT (1) | IT1172308B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0275240A2 (en) * | 1987-01-16 | 1988-07-20 | FIAT AUTO S.p.A. | A method for determining and indicating the volume of fuel in the tank of a motor vehicle |
| AU604969B2 (en) * | 1987-09-23 | 1991-01-03 | Veeder-Root Limited | Apparatus and method for determining the amount of material in a tank |
| FR2710743A1 (en) * | 1993-09-30 | 1995-04-07 | Dauvergne Jean | Device for measuring the quantity of fuel in a motor vehicle tank |
| WO1996038717A1 (en) * | 1995-06-02 | 1996-12-05 | Veeder-Root Company | An apparatus and method for calibrating manifolded tanks |
| US5757664A (en) * | 1996-06-04 | 1998-05-26 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| EP1058098A1 (en) * | 1999-06-03 | 2000-12-06 | Peugeot Citroen Automobiles SA | System for estimating the quantity of fuel contained in an automobile fuel tank |
| US6252499B1 (en) | 1998-07-29 | 2001-06-26 | Volkswagen Ag | Fuel supply indicator arrangement for a motor vehicle fuel tank |
| GB2379744A (en) * | 2001-08-31 | 2003-03-19 | Smiths Group Plc | Fluid gauging system |
| US6691061B1 (en) | 1996-06-04 | 2004-02-10 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6909986B2 (en) | 1996-06-04 | 2005-06-21 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6925397B2 (en) | 1994-11-29 | 2005-08-02 | Warren Rogers Associates | Meter calibration accuracy |
| US6934644B2 (en) | 1996-06-04 | 2005-08-23 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| EP1489393A3 (en) * | 2003-06-03 | 2007-05-30 | Endress + Hauser GmbH + Co. KG | Arrangement and method for level measurement |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4858468A (en) * | 1987-06-17 | 1989-08-22 | Fuji Photo Film Co., Ltd. | Method of detecting remaining quantity of replenishing solution |
| DE3825630A1 (en) * | 1988-07-28 | 1990-02-01 | Bayerische Motoren Werke Ag | Method for the determination and indication of the supply quantity of motor vehicle operational liquids contained in a supply container |
| DE4309604A1 (en) * | 1993-03-24 | 1994-10-13 | Bayerische Motoren Werke Ag | Method for determining a measured value for the supply of an operating fluid of motor vehicles |
| US5665895A (en) * | 1995-06-02 | 1997-09-09 | Veeder-Root Company | Apparatus and method for calibrating a storage tank |
| DE19610154A1 (en) * | 1996-03-15 | 1997-09-18 | Vdo Schindling | Fuel gauge and method for determining the remaining volume in a tank |
| DE19720125C2 (en) * | 1997-05-14 | 1999-02-25 | Dau Hans Joerg | Level measuring device |
| DE10111923A1 (en) * | 2001-03-13 | 2002-10-02 | Bosch Gmbh Robert | Method for tank level determination in motor vehicles |
| KR100569074B1 (en) | 2003-09-16 | 2006-04-07 | 현대자동차주식회사 | Apparatus for indicating distance to empty of vehicle and method thereof |
| DE102004047071A1 (en) * | 2004-09-28 | 2006-04-13 | Siemens Ag | Method and device for carrying out the method for checking the measured value of one or more fill level sensors arranged in a fuel tank |
| US7917322B2 (en) | 2008-03-07 | 2011-03-29 | Halliburton Energy Services Inc. | Weight observer for mass metering and inventory management |
| EP2466278B1 (en) * | 2010-12-16 | 2015-01-28 | Fiat Powertrain Technologies S.p.A. | Method for estimating the fuel level in a vehicle tank and corresponding fuel level estimation system |
| DE102013014886B4 (en) * | 2013-09-06 | 2019-12-12 | Audi Ag | Method for displaying a fill level value in a motor vehicle and motor vehicle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1373345A (en) * | 1970-11-25 | 1974-11-13 | Smiths Industries Ltd | Liquid-contents gauging systems |
| DE2928767C2 (en) * | 1979-07-17 | 1984-03-01 | Bayerische Motoren Werke AG, 8000 München | Method for determining the supply quantity of operating fluids in motor vehicles and circuit for carrying out the method |
| JPS5622915A (en) * | 1979-08-01 | 1981-03-04 | Hitachi Ltd | Residual fuel quantity gauge |
| JPS5949526B2 (en) * | 1980-10-27 | 1984-12-03 | トヨタ自動車株式会社 | How to display remaining fuel in a vehicle |
| SE8008601L (en) * | 1980-12-08 | 1982-06-09 | Volvo Ab | FUEL METERS FOR VEHICLES |
-
1982
- 1982-07-26 FR FR8212988A patent/FR2530807B1/en not_active Expired
-
1983
- 1983-07-22 IT IT48735/83A patent/IT1172308B/en active
- 1983-07-25 DE DE19833326719 patent/DE3326719A1/en active Granted
- 1983-07-26 ES ES525375A patent/ES8501118A1/en not_active Expired
- 1983-07-26 GB GB08320100A patent/GB2124390B/en not_active Expired
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0275240A2 (en) * | 1987-01-16 | 1988-07-20 | FIAT AUTO S.p.A. | A method for determining and indicating the volume of fuel in the tank of a motor vehicle |
| EP0275240A3 (en) * | 1987-01-16 | 1988-08-10 | Fiat Auto S.P.A. | A method for detecting the fuel level in the tank of a motor vehicle |
| US4912646A (en) * | 1987-01-16 | 1990-03-27 | Fiat Auto S.P.A. | Method for detecting the fuel level in the tank of a motor vehicle |
| AU604969B2 (en) * | 1987-09-23 | 1991-01-03 | Veeder-Root Limited | Apparatus and method for determining the amount of material in a tank |
| FR2710743A1 (en) * | 1993-09-30 | 1995-04-07 | Dauvergne Jean | Device for measuring the quantity of fuel in a motor vehicle tank |
| US6925397B2 (en) | 1994-11-29 | 2005-08-02 | Warren Rogers Associates | Meter calibration accuracy |
| WO1996038717A1 (en) * | 1995-06-02 | 1996-12-05 | Veeder-Root Company | An apparatus and method for calibrating manifolded tanks |
| US5757664A (en) * | 1996-06-04 | 1998-05-26 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6934644B2 (en) | 1996-06-04 | 2005-08-23 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6401045B1 (en) | 1996-06-04 | 2002-06-04 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6691061B1 (en) | 1996-06-04 | 2004-02-10 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6909986B2 (en) | 1996-06-04 | 2005-06-21 | Warren Rogers Associates, Inc. | Method and apparatus for monitoring operational performance of fluid storage systems |
| US6252499B1 (en) | 1998-07-29 | 2001-06-26 | Volkswagen Ag | Fuel supply indicator arrangement for a motor vehicle fuel tank |
| FR2794526A1 (en) * | 1999-06-03 | 2000-12-08 | Peugeot Citroen Automobiles Sa | SYSTEM FOR ESTIMATING THE QUANTITY OF FUEL REMAINING IN THE TANK OF A MOTOR VEHICLE |
| EP1058098A1 (en) * | 1999-06-03 | 2000-12-06 | Peugeot Citroen Automobiles SA | System for estimating the quantity of fuel contained in an automobile fuel tank |
| GB2379744B (en) * | 2001-08-31 | 2004-12-01 | Smiths Group Plc | Fluid gauging |
| US6658929B2 (en) | 2001-08-31 | 2003-12-09 | Smith Group Plc | Fluid gauging |
| GB2379744A (en) * | 2001-08-31 | 2003-03-19 | Smiths Group Plc | Fluid gauging system |
| EP1489393A3 (en) * | 2003-06-03 | 2007-05-30 | Endress + Hauser GmbH + Co. KG | Arrangement and method for level measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2530807B1 (en) | 1987-01-30 |
| DE3326719C2 (en) | 1992-01-23 |
| GB2124390B (en) | 1985-12-11 |
| ES525375A0 (en) | 1984-11-01 |
| DE3326719A1 (en) | 1984-01-26 |
| FR2530807A1 (en) | 1984-01-27 |
| IT1172308B (en) | 1987-06-18 |
| ES8501118A1 (en) | 1984-11-01 |
| IT8348735A0 (en) | 1983-07-22 |
| GB8320100D0 (en) | 1983-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19930726 |