Measurement and calculation method for automobile oil quantity

Abstract

The invention specifically discloses a method for measuring and calculating the oil quantity of an automobile, which comprises the following steps of: 1, connecting a transparent tube communicated with an oil tank to the top of the oil tank, dividing the transparent tube into two cavities by adopting a piston in the transparent tube, one cavity is an air column, and the other cavity is communicated with the oil tank; 2, a range finder fixing plate is installed at one end of the top of the oil tank, and a range finder is installed on the range finder fixing plate and used for detecting the position of a piston, so that the length of an air column in a transparent pipe is obtained; 3, calculating the volume of gas in the oil tank before refueling; fourthly, the actual net volume V1 of gas in the oil tank after oil filling is calculated; and fifthly, the actual oil filling amount V-V1 is calculated. According to the method, the oil quantity of the automobile fuel tank can be visually and linearly expressed by utilizing the physical property, the oil volume can be accurately determined, a pressure sensor, a temperature sensor or other electronic equipment is not needed, air temperature measurement is not needed, the method is simple, the manufacturing cost is low, and the precision is improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile oil quantity measurement, and in particular to a method for measuring automobile oil quantity. Background Art

[0002] As my country's economic strength continues to grow, more and more families are using private cars. For car owners, refueling has become the biggest consumption item after owning a car, so refueling has become a commonplace issue. In order to save space, the fuel tanks of today's family cars are often irregular geometric shapes. At present, cars calculate the amount of oil based on the oil level, which leads to unscientific measurement of the amount of oil in principle. Many car owners cannot know the actual amount of oil in their car tanks when using the car, and cannot estimate how much mileage the oil can still travel, which brings inconvenience to the car owners. Some car owners are worried about whether the amount of oil they buy with money every time they refuel, and whether there will be a shortage of weight. In the market, adding some floats to the car tank to connect the oil level sensor can judge the oil level of the tank according to the position of the float, and then display it on the oil gauge in the car. However, due to the irregular shape of the car fuel tank, the oil level measured by the oil level sensor is not linearly related to the actual oil amount, while the data displayed on the oil gauge is a linear relationship of the oil level. At the same time, the method of measuring the oil level by the oil level sensor is prone to failure; the details are as follows:

[0003] (1) The oil level sensor is stained and not cleaned in time, which directly affects the accuracy of the oil gauge indication; (2) The connecting rod between the oil level sensor and the float is stuck, and the float cannot float up and down normally, resulting in the oil level sensor not changing; (3) The instrument is damaged, the vehicle instrument mainboard has an electronic failure or the oil gauge display pointer is stuck, which will cause the instrument to not display. All of the above can cause the oil gauge in the car to not accurately reflect the oil level in the tank. For this reason, the present invention provides a method for measuring the oil level of a car. Summary of the invention

[0004] The purpose of the present invention is to provide a method for calculating the fuel level of an automobile in view of the defects of the prior art, so as to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above purpose, the present invention provides the following technical solution: a method for calculating the amount of oil in a car, the specific steps are as follows:

[0006] Step 1: Connect a transparent tube connected to the oil tank on the top of the oil tank, and separate the transparent tube into two cavities using an oily diaphragm, one cavity is an air column, and the other cavity is connected to the oil tank;

[0007] Step 2: A rangefinder fixing plate is installed at one end of the top of the oil tank, and a rangefinder is installed on the rangefinder fixing plate to determine the position of the oily diaphragm, thereby obtaining the length of the air column in the transparent tube;

[0008] Step 3: Calculate the volume of gas in the fuel tank before refueling;

[0009] The fuel tank cap is equipped with a piston structure, and the piston itself is designed to have a certain mass. The piston on the fuel tank cap is controlled by a solenoid valve to squeeze the air in the fuel tank and reduce the volume of the gas in the tank by ΔV under the sealed condition. ΔV is the volume of the fuel tank cap piston, which is a known quantity. Then the lengths of the air column in the transparent tube before and after squeezing are measured as l1 and l2 respectively. Assume that the cross-sectional area of ​​the transparent tube is s. According to the physical properties of the gas:

[0010] Assume that the volume of gas in the tank before refueling is V, the air temperature before compression is T1, the pressure is P1, and the air temperature after compression is T2, the pressure is P2. According to the universal gas law,

[0011] For the air in the tank:

[0012]

[0013] For the air in the transparent tube:

[0014]

[0015] By comparing formula (1) with formula (2), we can get Thus we get:

[0016]

[0017] It can be concluded that the volume V of the gas in the fuel tank before refueling is:

[0018]

[0019] Step 4: After refueling, use the method in step 3 to calculate the actual net volume of gas in the tank after refueling, recorded as V1.

[0020] Step 5: The actual refueling amount is V-V1.

[0021] As a preferred technical solution of the present invention, in step one, the fuel tank cap is equipped with a piston structure, and the piston itself is designed to have a certain mass. At the same time, a solenoid valve is provided to control the piston. By actively controlling the movement of the piston, the change in the volume of the space in the fuel tank is made to be a certain value ΔV, thereby measuring the volume of the air in the fuel tank before and after refueling.

[0022] As a preferred technical solution of the present invention, when the volume V of the gas in the fuel tank before refueling calculated in step three is equal to the known actual net volume Y of the fuel tank, it means that the amount of oil in the fuel tank is zero. Step four calculates the actual net volume V1 of the gas in the fuel tank after refueling according to the principle of step three, and the actual amount of oil in the fuel tank is Y-V1.

[0023] As a preferred technical solution of the present invention, the length data of the air column in the transparent tube is detected by a distance meter and the data is transmitted to the car computer through the car connecting data line.

[0024] As a preferred technical solution of the present invention, the rangefinder is an infrared rangefinder sensor.

[0025] As a preferred technical solution of the present invention, in step one, the fuel tank cap is equipped with a piston structure, and the piston itself is designed to have a certain mass. The vibration during the driving of the car is used to move the piston, so that the air volume in the fuel tank continuously changes by an amount ΔV. A rangefinder is used to measure the length of the air column in the transparent tube at any time and measure the air volume, thereby measuring the instantaneous amount of oil in the fuel tank.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This method uses the universal gas law to prove a new formula for gas change, which can intuitively and linearly represent the amount of oil in the automobile fuel tank and more accurately determine the volume of oil. The key is that it does not require a pressure sensor, a temperature sensor or other electronic equipment, and does not require measuring the air temperature. The method is simple, low in cost, and also improves accuracy.

[0028] The method of the present invention is different from other methods of measuring the oil level of a car fuel tank using sensors. Due to the irregular shape of the fuel tank, the oil level and the oil quantity are not in a linear relationship, which shows that the method of measuring the oil quantity by the oil level sensor on the market is unscientific. It is also different from the measurement method using the universal gas law. The data detected by the method of the present invention is more accurate, simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention.

[0030] In the figure: 1. oil tank; 2. transparent tube; 201. oily diaphragm; 3. oil filling port; 301. oil tank cap; 4. rangefinder fixing plate; 401. rangefinder. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0032] Example: See Figure 1 The present invention provides a technical solution: a method for calculating the amount of fuel in a car, the specific steps are as follows:

[0033] Step 1: Connect a transparent tube 2 connected to the oil tank 1 on the top of the oil tank 1. The inside of the transparent tube 2 is separated into two cavities by an oily diaphragm 201. One cavity is an air column, and the other cavity is connected to the oil tank 1.

[0034] Step 2: A rangefinder fixing plate 4 is installed at one end of the top of the oil tank 1, and a rangefinder 401 is installed on the rangefinder fixing plate 4, which is used to determine the position of the oily diaphragm 201, thereby obtaining the length of the air column in the transparent tube 2;

[0035] Step 3: Calculation of the volume of gas in the fuel tank 1 before refueling;

[0036] The fuel tank cover 301 is equipped with a piston structure, and the piston itself is designed to have a certain mass. The piston on the fuel tank cover 301 is controlled by a solenoid valve to squeeze the air in the fuel tank 1 and reduce the volume of the gas in the fuel tank 1 by ΔV under the sealed condition. ΔV is the volume of the fuel tank cover piston, which is a known quantity. Then, the lengths of the air column in the transparent tube 2 before and after squeezing are measured as l1 and l2 respectively. Assume that the cross-sectional area of ​​the transparent tube 2 is s. According to the physical properties of the gas:

[0037] Assume that the volume of gas in tank 1 before refueling is V, the air temperature before compression is T1, the pressure is P1, and the air temperature after compression is T2, the pressure is P2. According to the universal gas law,

[0038] For the air in tank 1, there are:

[0039]

[0040] For the air in transparent tube 2:

[0041]

[0042] From formula (1) and formula (2), we can get Thus we get:

[0043]

[0044] It can be concluded that the volume V of the gas in the fuel tank 1 before refueling is:

[0045]

[0046] Step 4: After refueling, use the method in step 3 to calculate the actual net volume of gas in tank 1 after refueling, recorded as V1.

[0047] Step 5: The actual refueling amount is V-V1.

[0048] In step 1, the fuel tank cap 301 is equipped with a piston structure, and the piston itself is designed to have a certain mass. At the same time, a solenoid valve is equipped to control the piston. By actively controlling the movement of the piston, the change in the volume of the space in the fuel tank 1 is a certain value ΔV, so that the volume of the air in the fuel tank can be measured before and after refueling.

[0049] In step 1, the fuel tank cap is equipped with a piston structure, and the piston itself is designed to have a certain mass. The vibration during the driving of the car is used to move the piston, so that the air volume in the fuel tank continuously changes by an amount ΔV. The distance meter 401 is used to measure the length of the air column in the transparent tube 2 at any time and measure the air volume, thereby measuring the instantaneous amount of oil in the fuel tank.

[0050] When the volume V of the gas in the fuel tank before refueling calculated in step three is equal to the known actual net volume Y of the fuel tank, it means that the amount of oil in the fuel tank is zero. Step four calculates the actual net volume V1 of the gas in the fuel tank after refueling according to the principle of step three, and the actual amount of oil in the fuel tank is Y-V1.

[0051] The data of the length of the air column in the transparent tube 2 is detected by the distance meter 401 and the data is transmitted to the car computer through the car connection data line; the distance meter 401 is an infrared distance measuring sensor.

[0052] Experimental verification 1:

[0053] A uniform cavity glass tube is connected to the outside of an air cylinder, and the tube mouth is connected to the air outlet of the air pump. A gas column with a length of 8 cm is sealed with diesel in the uniform cavity glass tube. When the air cylinder is compressed to three-quarters, one-half, and one-quarter of its original size, the length of the gas sealed by the oily diaphragm is measured by a rangefinder to be 6.1cm, 4.05cm, and 2.1cm. The reason for the low accuracy may be that the length measurement of the gas compressed by the air pump is inaccurate.

[0054] Experimental verification 2:

[0055] A wine bottle with a capacity of about 1000cc is connected to a slender, uniform and transparent glass tube at the mouth of the wine bottle. An air column with a length of 8 cm is sealed by an oily diaphragm in the glass tube. After 20cc of air is pressed into a medical syringe with a capacity of 20CC at one time, it is measured that the 8 cm long air column sealed by the oily diaphragm is compressed to 7.842cm. The volume is measured to be 992.6cc according to the formula of the present invention.

[0056] Experimental verification 3:

[0057] A wine bottle with a capacity of about 1000cc is connected to a slender, uniform and transparent glass tube at the mouth of the bottle. An 8-cm-long air column is sealed in the glass tube with an oily diaphragm. After 40cc of air is pressed into a medical syringe with a capacity of 20CC twice, it is measured that the 8-cm-long air column sealed by the oily diaphragm is compressed to 7.69cm. The volume is measured to be 992.3cc according to the formula.

[0058] In summary, it can be seen that the theory and method based on which the method of the present invention is calculated are accurate, so the method is also accurate when applied to the calculation of the oil volume in the fuel tank.

[0059] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. A method for calculating the amount of oil in a car, characterized in that: The specific steps are as follows: Step 1: A transparent tube (2) connected to the oil tank (1) is connected to the top of the oil tank (1), wherein the interior of the transparent tube (2) is separated into two cavities by an oily diaphragm (201), one cavity being an air column and the other cavity being connected to the oil tank (1); Step 2: A rangefinder fixing plate (4) is installed at one end of the top of the oil tank (1), and a rangefinder (401) is installed on the rangefinder fixing plate (4) for determining the position of the oily diaphragm (201), thereby obtaining the length of the air column in the transparent tube (2); Step 3: Calculation of the volume of gas in the fuel tank (1) before refueling; The fuel tank cover (301) is equipped with a piston structure, and the piston itself is designed to have a certain mass. The piston movement on the fuel tank cover (301) is controlled by a solenoid valve, and the piston is used to squeeze the air in the fuel tank (1) so that the volume of the gas in the fuel tank (1) decreases by ΔV under a sealed condition. ΔV is the volume of the fuel tank cover piston, which is a known quantity. Then, the lengths of the air column in the transparent tube (2) before and after squeezing are measured, which are l1 and l2 respectively. Assuming that the cross-sectional area of ​​the transparent tube (2) is s, according to the physical properties of the gas: Assume that the volume of the gas in the fuel tank (1) before refueling is V, the air temperature before compression is T1, the pressure is P1, and the air temperature after compression is T2, the pressure is P2. According to the universal gas law, For the air in the oil tank (1), there are: For the air in the transparent tube (2), we have: Right now By comparing formula (1) with formula (2), we can get Thus we get: It can be concluded that the volume V of the gas in the fuel tank (1) before refueling is: Step 4: After refueling, use the method in step 3 to calculate the actual net volume of gas in the fuel tank (1) after refueling, recorded as V1, Step 5: The actual refueling amount is V-V1.

2. The method for calculating the amount of fuel in an automobile according to claim 1, characterized in that: In step 1, the fuel tank cap (301) is equipped with a piston structure, and the piston itself is designed to have a certain mass. At the same time, a solenoid valve is provided to control the piston. By actively controlling the movement of the piston, the change in the volume of the space in the fuel tank (1) is a certain value ΔV, so that the volume of the air in the fuel tank before and after refueling can be measured respectively.

3. The method for calculating the amount of fuel in an automobile according to claim 1, characterized in that: When the volume V of the gas in the fuel tank before refueling calculated in step three is equal to the known actual net volume Y of the fuel tank, it means that the amount of oil in the fuel tank is zero. Step four calculates the actual net volume V1 of the gas in the fuel tank after refueling according to the principle of step three, and the actual amount of oil in the fuel tank is Y-V1.

4. The method for calculating the amount of fuel in an automobile according to claim 1, characterized in that: The data of the length of the air column in the transparent tube (2) is detected by the distance meter (401) and transmitted to the vehicle computer via the vehicle connection data line.

5. The method for calculating the amount of fuel in an automobile according to claim 4, characterized in that: The distance meter (401) is an infrared distance measuring sensor.

6. The method for calculating the amount of fuel in an automobile according to claim 1, characterized in that: In step 1, the fuel tank cap is equipped with a piston structure, and the piston itself is designed to have a certain mass. The vibration during the driving of the car is used to move the piston, so that the volume of air in the fuel tank continuously changes by an amount ΔV. The distance meter (401) is used to measure the length of the air column in the transparent tube (2) at any time and measure the air volume, thereby measuring the instantaneous amount of oil in the fuel tank.

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