CN110617869A - High-precision automobile fuel gauge indicating system and fuel quantity calculating method thereof - Google Patents
High-precision automobile fuel gauge indicating system and fuel quantity calculating method thereof Download PDFInfo
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- CN110617869A CN110617869A CN201910904806.6A CN201910904806A CN110617869A CN 110617869 A CN110617869 A CN 110617869A CN 201910904806 A CN201910904806 A CN 201910904806A CN 110617869 A CN110617869 A CN 110617869A
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- 239000000446 fuel Substances 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title description 8
- 239000002828 fuel tank Substances 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 7
- 239000013598 vector Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
-
- 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
- G01F23/64—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 of the free float type without mechanical transmission elements
- G01F23/68—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 of the free float type without mechanical transmission elements using electrically actuated indicating means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
The invention discloses a high-precision automobile fuel gauge indicating system which comprises three fuel pumps (2), three angle sensors and a combined instrument (3), wherein the three fuel pumps (2) are respectively a first fuel pump, a second fuel pump and a third fuel pump; each fuel pump floater measures the resistance value of the fuel pump; the first fuel pump and the second fuel pump are distributed according to the front-back direction of the vehicle, and the second fuel pump and the third fuel pump are distributed according to the left-right direction of the vehicle. By adopting the technical scheme, the fuel quantity is judged by obtaining multiple groups of data by increasing the number of the fuel floats, the fuel quantity indicating precision of the automobile fuel gauge indicating system is improved, meanwhile, the slope parking and refueling states of the automobile can be judged by an algorithm, and the requirements of vehicle operators on controlling the fuel quantity in the fuel tank and taking corresponding measures are met.
Description
Technical Field
The invention belongs to the technical field of automobile fuel metering indication. More particularly, the invention relates to a high-precision automobile fuel gauge indicating system. By adding a fuel sensor, a relatively high accuracy fuel indication can be achieved. Meanwhile, states such as slope parking and the like can be distinguished through a certain algorithm.
Background
The indication principle of the fuel gauge is that the gauge reads the resistance value of the fuel pump and displays the fuel quantity according to the corresponding relation of the resistance value and the liter number. In order to ensure the timeliness of fuel indication, the oil pump float is usually extremely low in damping, and the height of the float can be changed by small fuel level fluctuation so as to change the fuel resistance.
During the running process of the vehicle, the fuel liquid level is in a state of fluctuating up and down at any moment due to inertia and bumping, so that the fuel resistance value fluctuates continuously. The fuel gauge will cause the fuel gauge indication to fluctuate if it directly indicates the fuel quantity in terms of resistance. To solve this problem, it is common practice to algorithmically apply a large damping to the resistance data and use a high order filtering algorithm to filter out fluctuations. Because the fluctuation is very violent, after the algorithm processing, only the approximate change trend of the fuel can be obtained, and simultaneously, larger lag also exists. Meanwhile, due to the fact that the structure of the oil tank and the oil pump is limited, when the oil tank has an inclination angle, the fuel liquid level corresponding to the oil pump floater cannot be changed inevitably, and therefore the fuel resistance value is changed. The change of the fuel resistance caused by slope parking and long-time driving on a slope and the change of the fuel resistance caused by refueling and fuel consumption cannot be quickly and conveniently distinguished from the traditional fuel gauge.
In order to solve this problem, it is a conventional practice to increase the judgment of the fuel variation amount and the variation time. I.e. a delayed determination of the reference fuel level after a stop is required. When the fuel is added, the fuel quantity needs to continuously rise by 5-6L, and the duration time exceeds about 10s, the fuel is considered to enter the fuel adding mode, and the fuel quantity is changed. In practice this logic does not fundamentally solve the problem. In actual operation, particularly when the fuel amount is relatively small or at a specific gradient, misjudgment of refueling or misjudgment of slope standing still exists to cause fuel amount variation error.
The following patent documents have been searched in the prior art:
a display control system of a CN201711129476.5 automobile fuel gauge;
CN201710923224.3 a method for indicating an automobile fuel gauge and a device and a method for verifying the same;
CN201510163266.2 an indicating method and device of automobile fuel gauge.
The automobile fuel gauge indicates the liquid level height through the floater, converts the liquid level height into a corresponding resistance value, and converts the resistance value into a corresponding fuel quantity through analog-to-digital conversion. Any jolt will cause the fuel level to fluctuate, resulting in the failure of the fuel gauge indicating system to accurately indicate the amount of fuel in the tank.
Disclosure of Invention
The invention provides a high-precision automobile fuel gauge indicating system, which aims to improve the fuel indicating precision and judge the slope parking and refueling states of a vehicle through an algorithm.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention relates to a high-precision automobile fuel gauge indicating system, which comprises a fuel pump, an angle sensor and a combination meter; the number of the fuel pumps arranged in the oil tank is three, and the fuel pumps are respectively a first fuel pump, a second fuel pump and a third fuel pump; each fuel pump floater measures the resistance value of the fuel pump; the first fuel pump and the second fuel pump are distributed according to the front-back direction of the vehicle, and the second fuel pump and the third fuel pump are distributed according to the left-right direction of the vehicle.
The front and back direction of the vehicle is recorded as the X direction, and the difference value of the resistance values of the first fuel pump and the second fuel pump is recorded as X; the front and back direction of the vehicle is recorded as Y direction, and the difference value of the resistance values of the second fuel pump and the third fuel pump is recorded as Y; the vertical direction is marked as the Z direction;
1. when the X, Y values are all smaller than the specified error range, the fuel gauge indicates that the system considers that the vehicle is on the flat ground; when the combination meter 3 is on the flat ground, independently filtering the resistance values of the three fuel pumps, and after the obtained three data are processed averagely, obtaining the current fuel quantity data;
2. when one or two of the X, Y values exceed a specified error range, the fuel gauge indicates that the system considers that the vehicle is on a slope;
when the fuel pump resistance values are all in the range, according to the shape of the fuel tank, the weighted values of two different fuel resistance values of the fuel pump in the same direction under a specific angle can be calibrated, then data processing is respectively carried out according to the data of the group X and the group Y, and then the current fuel quantity is calculated;
when the oil quantity is too low or the gradient is too large, the fuel pumps on one side or two sides reach the maximum value or the minimum value of the measuring range; at the moment, the meter needs to be displayed according to the memory value and is consistent with the logic of the common fuel meter.
By adopting the technical scheme, the fuel quantity is judged by obtaining multiple groups of data by increasing the number of the fuel floats, the fuel quantity indicating precision of the automobile fuel gauge indicating system is improved, meanwhile, the slope parking and refueling states of the automobile can be judged by an algorithm, and the requirements of vehicle operators on controlling the fuel quantity in the fuel tank and taking corresponding measures are met.
Drawings
The contents of the drawings, and the references therein, are briefly described as follows:
FIG. 1 is a schematic illustration of a fuel system according to the present invention;
FIG. 2 is a schematic view of the placement of three fuel pumps of the present invention in a fuel tank arrangement;
FIG. 3 is a schematic representation of the position of the fuel pump of the present invention in spatial coordinates;
FIG. 4 is a schematic illustration of the grade in a longitudinal section of the vehicle;
FIG. 5 is a schematic grade view in cross section of a vehicle;
FIG. 6 is a flow chart of the present invention.
Labeled as:
1. an oil tank 2, a fuel pump 3 and a combination meter.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
The structure of the invention as shown in fig. 1 and 2 is a high-precision automobile fuel gauge indicating system, which comprises a fuel pump 2, an angle sensor and a combination meter 3.
In order to overcome the defects of the prior art, improve the fuel indication precision and judge the slope parking and refueling states of the vehicle through an algorithm, the invention adopts the following technical scheme:
the high-precision automobile fuel gauge indicating system is characterized in that three fuel pumps 2 are arranged in an oil tank 1 and respectively comprise a first fuel pump, a second fuel pump and a third fuel pump; each fuel pump floater measures the resistance value of the fuel pump; the first fuel pump and the second fuel pump are distributed according to the front-back direction of the vehicle, and the second fuel pump and the third fuel pump are distributed according to the left-right direction of the vehicle.
As shown in FIG. 1, the fuel system hardware consists of three parts: fuel pump, angle sensor, combination meter. As shown in fig. 2, three fuel pumps are arranged in the fuel tank at a position indicated schematically. The fuel quantity is judged through multiple groups of data by adding the sensors, namely increasing the number of fuel floats, so that the fuel indication precision is improved; meanwhile, the slope parking and refueling states of the vehicle can be judged through an algorithm.
Specifically, three fuel floats are arranged at specific positions of a fuel tank; and generating an algorithm according to parameters such as the shape of the oil tank, the position of the fuel floater and the like, and integrating the three groups of fuel data to form accurate fuel quantity data.
According to the invention, through the mode, three fuel floats are arranged at the specific position of the fuel tank to collect fuel level signals, and three groups of fuel resistance values are integrated through an algorithm, so that the fuel level is relatively accurately indicated.
The implementation method comprises the following steps: 1. the meter receives the resistance values of the three fuel pumps and processes the data of the resistance values; 2. grouping and comparing the fuel resistance values; 3. within the error range, the three data are processed according to the flat land logic, and the average value of the three data is displayed; 4. and if the error range is exceeded, performing logic processing according to a ramp, and performing weighting processing on the data to obtain the fuel quantity for displaying.
In fig. 2, the fuel pump 1 and the fuel pump 2 are in the same longitudinal position of the vehicle body; the fuel pump 2 and the fuel pump 3 are in the same lateral position of the vehicle body.
As shown in fig. 4 to 6:
the front and back direction of the vehicle is recorded as the X direction, and the difference value of the resistance values of the first fuel pump and the second fuel pump is recorded as X; the front and back direction of the vehicle is recorded as Y direction, and the difference value of the resistance values of the second fuel pump and the third fuel pump is recorded as Y; the vertical direction is marked as the Z direction;
1. when the X, Y values are all smaller than the specified error range, the fuel gauge indicates that the system considers that the vehicle is on the flat ground; when the combination meter 3 is on the flat ground, independently filtering the resistance values of the three fuel pumps, and after the obtained three data are processed averagely, obtaining the current fuel quantity data;
2. when one or two of the X, Y values exceed a specified error range, the fuel gauge indicates that the system considers that the vehicle is on a slope;
when the fuel pump resistance values are all in the range, according to the shape of the fuel tank, the weighted values of two different fuel resistance values of the fuel pump in the same direction under a specific angle can be calibrated, then data processing is respectively carried out according to data in the X direction and the Y direction, and then the current fuel quantity is calculated;
when the oil quantity is too low or the gradient is too large, the fuel pumps on one side or two sides reach the maximum value or the minimum value of the measuring range; at the moment, the meter needs to be displayed according to the memory value and is consistent with the logic of the common fuel meter.
The working principle of the present invention is analyzed as follows:
the invention has two main functions:
1. the fuel quantity is more accurately judged by increasing the data quantity on the flat ground and integrating three groups of data;
2. and the slope is judged by utilizing two pairs of data of the three fuel pumps in the slope so as to compensate the fuel resistance value, so that the aim of accurately judging the fuel quantity is fulfilled.
The flow chart of the invention is shown in FIG. 6:
when the value of X, Y is below a calibrated error range, the vehicle is considered to be level ground. When the meter is on the flat ground, the resistance values of the three fuel pumps are independently subjected to filtering and other treatment. And obtaining the current fuel quantity after averaging the obtained three data.
Because the whole fuel meter system has random error of the fuel pump resistance, random error caused by impedance which cannot be measured and can change along with time existing on a circuit, random error caused by AD conversion of the resistance of an instrument and the like, large error can be accumulated when the single fuel pump indicates the fuel quantity. By adopting the resistance values of the pumps, the error in the calibration error range can be eliminated to the greatest extent, so that the indication of the instrument is as close to the actual fuel quantity as possible.
When one or two of the X, Y values exceed the calibrated error range, the whole vehicle is on the slope.
The value X exceeds the range, the vehicle is an up-down slope and has a slope in the front-back direction of the vehicle, and the vehicle is in a down slope when the value X is larger than 0 and in an up slope when the value X is smaller than 0 according to the resistance value relation corresponding to the position of the pump and the liquid level;
the Y value exceeds the range, the vehicle is a side slope, and the slope of the left and right directions of the vehicle is greater than 0, the right side is higher and smaller than 0, and the left side is higher; and if the X and Y values exceed the range, the front and back slopes exist in the left and right directions.
Taking two pumps in the Y direction as an example, the gradient of the vehicle in the front-back direction changes, the left-right direction keeps horizontal, and the fuel liquid level keeps horizontal, as shown in FIG. 3, the liquid level can be considered to be parallel to the X axis, and the vehicle angle changes in the X-Z plane when the slope changes.
The second and third fuel pumps are arranged in a position parallel to the Y-axis, their projections on the X-Z plane on the fuel level plane representing the fuel quantity, and since their connecting lines are perpendicular to the X-Z plane, the two pump fuel quantities in the Y-direction are always identical regardless of the angle of the upward gradient in the front-rear direction of the vehicle. Similarly, the gradient change of the left and right directions of the vehicle does not influence two pump parameters in the X direction.
From the above, the change of the slope in the front-back direction will affect the parameter in the X direction, but not the parameter in the Y direction; the change in the left-right direction gradient affects the Y-direction parameters, but does not affect the X-direction parameters. That is, the X direction may calculate the gradient in the front-rear direction, and the Y direction may calculate the gradient in the left-right direction.
When the front, back and left and right slopes are formed, the three-dimensional vector in the X-Y-Z space can be considered as a three-dimensional vector, and therefore the three-dimensional vector can be decomposed by vectors of an X-Z plane and a Y-Z plane, and can be considered as a superposition of a front-back slope and a left-right slope. Therefore, the gradients in the front-back direction and the left-right direction can be calculated respectively in the X direction and the Y direction, and then the gradients can be superposed.
Therefore, when the vehicle is at any gradient, the gradients in the two directions can be independently calculated by independently analyzing the two sets of data in the X direction and the Y direction.
As shown in fig. 4 and 5:
when the vehicle is on a slope, the vehicle can be considered to rotate with one side wheel as an axis and the other side wheel.
In fig. 3 and 4, the stroke and the distance between the two pumps in the X direction or the Y direction are known, and the included angle a, namely the included angle between the vehicle and the plane, can be calculated.
When the fuel pump resistance values are all in the range, according to the shape of the fuel tank, the weighted values of two different fuel resistance values of the fuel pump in the same direction under a specific angle can be calibrated, then data processing is respectively carried out according to the data of X and Y, and then the current fuel quantity is calculated.
When the oil quantity is too low or the gradient is too large, the fuel pumps on one side or two sides reach the maximum value or the minimum value of the measuring range. At the moment, the meter needs to be displayed according to the memory value, and the logic of the meter is consistent with that of the traditional fuel meter.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (2)
1. The utility model provides a high accuracy car fuel gauge indicating system, fuel gauge indicating system include fuel pump (2), angle sensor and combination meter (3), its characterized in that: the number of the fuel pumps (2) in the oil tank (1) is three, and the three fuel pumps are respectively a first fuel pump, a second fuel pump and a third fuel pump; each fuel pump floater measures the resistance value of the fuel pump; the first fuel pump and the second fuel pump are distributed according to the front-back direction of the vehicle, and the second fuel pump and the third fuel pump are distributed according to the left-right direction of the vehicle.
2. The fuel quantity calculation method of the high-precision automobile fuel gauge indicating system according to claim 1, characterized in that:
the front and back direction of the vehicle is recorded as the X direction, and the difference value of the resistance values of the first fuel pump and the second fuel pump is recorded as X; the front and back direction of the vehicle is recorded as Y direction, and the difference value of the resistance values of the second fuel pump and the third fuel pump is recorded as Y; the vertical direction is marked as the Z direction;
1) when the X, Y values are all smaller than the specified error range, the fuel gauge indicating system determines that the vehicle is on the flat ground; when the combination instrument (3) is on the flat ground, independently filtering the resistance values of the three fuel pumps, and after the obtained three data are processed averagely, obtaining the current fuel quantity data;
2) when one or two of the X, Y values exceed a specified error range, the fuel gauge indicates that the system considers that the vehicle is on a slope;
when the fuel pump resistance values are all in the range, according to the shape of the fuel tank, the weighted values of two different fuel resistance values of the fuel pump in the same direction under a specific angle can be calibrated, then data processing is respectively carried out according to the data of the group X and the group Y, and then the current fuel quantity is calculated;
when the oil quantity is too low or the gradient is too large, the fuel pumps on one side or two sides reach the maximum value or the minimum value of the measuring range; at the moment, the meter needs to be displayed according to the memory value and is consistent with the logic of the common fuel meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910904806.6A CN110617869A (en) | 2019-09-24 | 2019-09-24 | High-precision automobile fuel gauge indicating system and fuel quantity calculating method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910904806.6A CN110617869A (en) | 2019-09-24 | 2019-09-24 | High-precision automobile fuel gauge indicating system and fuel quantity calculating method thereof |
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| CN110617869A true CN110617869A (en) | 2019-12-27 |
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| CN201910904806.6A Pending CN110617869A (en) | 2019-09-24 | 2019-09-24 | High-precision automobile fuel gauge indicating system and fuel quantity calculating method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113910904A (en) * | 2021-10-15 | 2022-01-11 | 东风小康汽车有限公司重庆分公司 | Display method and system of fuel gauge |
| CN114166312A (en) * | 2021-10-25 | 2022-03-11 | 深圳市发掘科技有限公司 | Vehicle oil quantity measuring method and device, computer equipment and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1763484A (en) * | 2004-10-21 | 2006-04-26 | 胡嘉刚 | Motor vehicle fuel tank system capable of providing measurement data of road grade and fuel volume |
| US20140150549A1 (en) * | 2012-11-28 | 2014-06-05 | Airbus Operations Gmbh | Fill level measurement system and method for determining a fill level |
| CN103940492A (en) * | 2014-04-30 | 2014-07-23 | 安徽江淮汽车股份有限公司 | Fuel quantity displaying method and system |
| CN108680226A (en) * | 2018-03-01 | 2018-10-19 | 山东大学 | A kind of detection method of the current oil mass of accurate fuel tank |
| CN110081947A (en) * | 2019-03-28 | 2019-08-02 | 中国第一汽车股份有限公司 | A kind of Fuel Remained amount display control method based on road grade signal |
-
2019
- 2019-09-24 CN CN201910904806.6A patent/CN110617869A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1763484A (en) * | 2004-10-21 | 2006-04-26 | 胡嘉刚 | Motor vehicle fuel tank system capable of providing measurement data of road grade and fuel volume |
| US20140150549A1 (en) * | 2012-11-28 | 2014-06-05 | Airbus Operations Gmbh | Fill level measurement system and method for determining a fill level |
| CN103940492A (en) * | 2014-04-30 | 2014-07-23 | 安徽江淮汽车股份有限公司 | Fuel quantity displaying method and system |
| CN108680226A (en) * | 2018-03-01 | 2018-10-19 | 山东大学 | A kind of detection method of the current oil mass of accurate fuel tank |
| CN110081947A (en) * | 2019-03-28 | 2019-08-02 | 中国第一汽车股份有限公司 | A kind of Fuel Remained amount display control method based on road grade signal |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113910904A (en) * | 2021-10-15 | 2022-01-11 | 东风小康汽车有限公司重庆分公司 | Display method and system of fuel gauge |
| CN113910904B (en) * | 2021-10-15 | 2023-09-01 | 东风小康汽车有限公司重庆分公司 | Display method and system of fuel gauge |
| CN114166312A (en) * | 2021-10-25 | 2022-03-11 | 深圳市发掘科技有限公司 | Vehicle oil quantity measuring method and device, computer equipment and storage medium |
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Application publication date: 20191227 |
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