Automobile liquid level sensor

Abstract

The present invention discloses an automobile liquid level sensor, which relates to the technical field of liquid level sensors, and comprises a main body, a variable resistance component, a lever wire and a float, wherein the main body is mounted on the inner wall of the automobile oil tank; the variable resistance component comprises a rectangular frame fixed to the side wall of the main body, a resistor bar is arranged in the vertical direction on one side of the rectangular frame, a deformable conductive sheet is arranged on the other side of the rectangular frame, the conductive sheet corresponds to the resistor bar, the tops of the resistor bar and the conductive sheet are respectively electrically connected to the main body through wires, a sliding block is arranged on the rectangular frame for longitudinal sliding, a variable resistance connecting piece connecting the resistor bar and the conductive sheet is arranged on the sliding block, and when the sliding block changes the longitudinal position, the resistance value of the variable resistance component changes synchronously; the end of the lever wire is rotatably arranged on the main body, and a driving structure is arranged between the lever wire and the sliding block; the float is fixedly arranged at one end of the lever wire away from the main body, and the overall density of the float is less than gasoline. The present invention solves the problem that the detection value of the float liquid level sensor does not match the actual gasoline consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level sensors, and in particular to an automobile liquid level sensor. Background Art

[0002] Cars are one of the more popular means of transportation in today's society. Among the existing cars, cars that use gasoline as fuel and hybrid cars will have a fuel tank installed on the body to store gasoline to ensure the endurance of the car during driving. The fuel level of the vehicle's fuel tank is important information during driving. Once the display is inaccurate, the vehicle may be at risk of breaking down, so a liquid level sensor is integrated in the fuel tank. The float liquid level sensor is one of the most commonly used fuel tank liquid level detection devices. The float drives the lever to rotate as the fuel tank liquid level changes, so that the contact position of the pointer connected to the lever and the sliding rheostat changes, and the change in resistance of the control circuit is converted into an electrical signal indicated on the dashboard.

[0003] When the car is driving, the float moves in an arc-shaped path as the gasoline level drops. During the process of the liquid level dropping, the displacement of the float is reflected on the sliding rheostat as a linear change, that is, the angle change of the float. However, to monitor the gasoline level, the float is actually required to reflect the height change of the liquid level. When the float is moving in an arc, the value of the change in the liquid level height is the longitudinal displacement distance of the float. Therefore, Figure 1 As shown, when the float rotates to the same angle, the resistance of the sliding rheostat changes consistently, but the corresponding liquid level changes are different. As a result, the gasoline level change is not positively correlated with the rotation angle of the float and the resistance change of the sliding rheostat, causing the indication on the instrument panel to be inconsistent with the actual gasoline consumption. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the detected value of the float liquid level sensor is inconsistent with the actual gasoline consumption, and to propose an automobile liquid level sensor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An automobile liquid level sensor comprises a main body, a variable resistance component, a lever wire and a float, wherein:

[0007] The main body is installed on the inner wall of the automobile fuel tank;

[0008] A variable resistance component, comprising a rectangular frame fixed to a side wall of a main body, a resistor bar is arranged on one side of the rectangular frame in a vertical direction, a deformable conductive sheet is arranged on the other side of the rectangular frame, the conductive sheet corresponds to the resistor bar, the resistor bar and the top of the conductive sheet are electrically connected to the main body through wires, a sliding block is arranged on the rectangular frame for longitudinal sliding, a variable resistance connecting piece connecting the resistor bar and the conductive sheet is arranged on the sliding block, and when the sliding block changes its longitudinal position, the resistance value of the variable resistance component changes synchronously;

[0009] A lever wire, the end of which is rotatably arranged on the main body, and a driving structure is arranged between the lever wire and the sliding block;

[0010] The float is fixedly arranged at one end of the lever wire away from the main body, and the overall density of the float is less than that of gasoline.

[0011] Preferably, a slot is provided on the side wall of the rectangular frame, the sliding block is U-shaped, the open end of the sliding block is clamped on the rectangular frame, and a clamping block adapted to the slot is provided on the inner side wall of the sliding block.

[0012] Preferably, a plurality of rollers are distributed in an array in the block, and the outer peripheral surfaces of the rollers abut against the inner wall of the slot.

[0013] Preferably, the driving structure includes a guide rod fixedly arranged on the outer wall of the sliding block, a guide groove is opened on the guide rod, the guide rod is horizontally arranged, and a pressure rod is arranged on the side wall of the lever wire, the pressure rod extends into the guide groove and abuts against the inner wall of the guide groove.

[0014] Preferably, the variable resistance connecting member includes a conductive guide frame fixedly arranged on the sliding block, a contact point is arranged on one end of the guide frame close to the resistor bar, the contact point passes through the sliding block and abuts against the surface of the resistor bar, a conductive ring is installed on the side of the guide frame close to the conductive sheet, a resistor column is slidably arranged on the conductive ring, and a spring is arranged between the resistor column and the guide frame to make the resistor column extend outward and abut against the surface of the conductive sheet.

[0015] Preferably, an insulating plate is provided between the resistor column and the spring.

[0016] Preferably, the conductive sheet is an elastic metal sheet, and the deformation of the conductive sheet is elastic deformation.

[0017] Preferably, a plurality of adjustment rods are distributed in a linear array on the rectangular frame, the adjustment rods are threadedly connected to the rectangular frame, a half-open clip is rotatably provided at one end of the adjustment rod close to the conductive sheet, the conductive sheet passes through all the clips, and the conductive sheet is fixedly connected to the topmost clip, and the conductive sheet is slidably connected to the remaining clips.

[0018] Preferably, the float comprises an outer cylinder, a plurality of liquid permeable holes are provided on the outer peripheral surface of the outer cylinder, an elastic airbag is sealed in the outer cylinder, and a pressure sensor electrically connected to the main body is arranged in the elastic airbag.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The present invention realizes the detection of the liquid level in the fuel tank by setting a variable resistance component, utilizing the buoyancy of the float in gasoline, cooperating with the lever wire to expand the torque, changing the resistance value of the variable resistance component, and realizing the detection of the liquid level in the fuel tank. In the variable resistance component, the resistance bar is installed vertically. Under the action of the driving structure, the displacement height of the float is proportionally reflected in the displacement of the sliding block, so that the change of the height of the float with the gasoline liquid level is proportional to the change of the resistance value of the resistance bar, so that the indicated value on the instrument panel is consistent with the actual consumption of gasoline, thereby improving the accuracy of fuel tank liquid level monitoring.

[0021] 2. The present invention forms an electrical path by providing a deformable conductive sheet and a retractable resistor column to connect the resistor bar and the conductive sheet. By changing the shape of the conductive sheet, the sliding block can achieve the purpose of nonlinear change of resistance when changing its position. Since the shape of the automobile fuel tank usually needs to be designed according to the structural layout of the automobile, the oil volume corresponding to different liquid level heights in the automobile fuel tank does not change linearly, so the unit change of liquid level height corresponds to different oil volumes. By calibrating the shape of the conductive sheet according to the shape capacity of the fuel tank, the unit change of the liquid level height can correspond to the same oil volume, which can effectively solve the nonlinear influence of the fuel tank shape on the relationship between the liquid level height and the oil volume, and improve the accuracy and reliability of the oil volume monitoring system.

[0022] 3. The present invention provides a float containing an elastic airbag, and the outer cylinder of the float can rigidly support the elastic airbag. The float floats on the gasoline because the buoyancy of the float exceeds its own gravity. When the float floats, it must have a certain draft. When the oil volume is too small to reach the draft, the liquid level change cannot be detected. However, the liquid pressure generated on the elastic airbag by the oil volume that submerges the elastic airbag causes the pressure sensor located in the elastic airbag to convert the pressure change into an electrical signal and transmit it to the instrument panel, so that the remaining oil level can be monitored even when the oil volume is low, thereby improving the comprehensiveness and practicality of the fuel tank liquid level monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an existing float liquid level sensor;

[0024] Figure 2 This is a schematic diagram of the overall structure of an automobile liquid level sensor proposed by the present invention;

[0025] Figure 3This is a front view structural schematic diagram of an automobile liquid level sensor proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of a rectangular frame in an automobile liquid level sensor proposed by the present invention;

[0027] Figure 5 This is a structural schematic diagram of a sliding block and a variable resistance connecting piece in an automobile liquid level sensor proposed by the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of a lever wire and a float in an automobile liquid level sensor proposed by the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of an adjustment rod in an automobile liquid level sensor proposed by the present invention;

[0030] Figure 8 The present invention provides a schematic cross-sectional structural diagram of a float in an automobile liquid level sensor.

[0031] In the figure: 1. main body; 2. variable resistance assembly; 21. rectangular frame; 211. card slot; 22. resistor strip; 23. conductive sheet; 24. sliding block; 241. card block; 242. roller; 25. variable resistance connector; 251. guide frame; 252. contact; 253. conductive ring; 254. resistor column; 255. spring; 256. insulating plate; 26. guide rod; 261. guide groove; 27. adjusting rod; 271. card strip; 3. lever wire; 31. pressure rod; 4. float; 41. outer cylinder; 42. elastic air bag; 43. liquid permeable hole; 44. pressure sensor. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] Reference Figure 2-6A car liquid level sensor includes a main body 1, a variable resistance component 2, a lever wire 3 and a float 4. The float 4 is fixedly arranged at one end of the lever wire 3 away from the main body 1. The overall density of the float 4 is less than that of gasoline. Through the buoyancy of the float 4, the float 4 changes its position as the gasoline liquid level changes, and then the resistance value of the variable resistance component 2 is controlled by changing the position of the lever wire 3, so that the current in the current path between the main body 1 and the variable resistance component 2 changes. The main body 1 is installed on the inner wall of the automobile fuel tank, and the main body 1 is connected to the instrument panel of the automobile cab, and the change of the current is converted into an electrical signal and reflected on the fuel gauge on the instrument panel, so that the driver can clearly grasp the remaining fuel in the fuel tank.

[0035] The variable resistor assembly 2 includes a rectangular frame 21 fixed to the side wall of the main body 1, a resistor bar 22 is arranged on one side of the rectangular frame 21 in the vertical direction, and a deformable conductive sheet 23 is arranged on the other side of the rectangular frame 21. The conductive sheet 23 corresponds to the resistor bar 22, and the length of the conductive sheet 23 is greater than the length of the resistor bar 22, so that the conductive sheet 23 can still maintain a sufficient length after deformation. The tops of the resistor bar 22 and the conductive sheet 23 are electrically connected to the main body 1 through wires respectively. A sliding block 24 is arranged on the rectangular frame 21 to slide longitudinally, and the sliding block 24 is arranged on the rectangular frame 21 to slide longitudinally. 4 is provided with a variable resistance connecting member 25 connecting the resistor bar 22 and the conductive sheet 23. Through the variable resistance connecting member 25, a closed-loop electrical path is formed between the main body 1, the resistor bar 22 and the conductive sheet 23. The position of the sliding block 24 is controlled by the float 4. When the gasoline level in the fuel tank changes, the sliding block 24 changes its longitudinal position, and the position of the connection point between the variable resistance connecting member 25 and the resistor bar 22 and the conductive sheet 23 changes, so that the resistance value of the variable resistance component 2 changes synchronously, which is fed back to the main body 1 and converted into an electrical signal for display on the car dashboard.

[0036] The end of the lever wire 3 is rotatably arranged on the main body 1, and the rotation angle range of the lever wire 3 is between -70° and 0°. A driving structure is arranged between the lever wire 3 and the sliding block 24. Through the driving structure, when the float 4 drives the lever wire 3 to rotate, the change of the gasoline liquid level and the longitudinal displacement of the sliding block 24 maintain a positive correlation.

[0037] It should be noted that, refer to Figure 1In the traditional float liquid level sensor, the float moves in a circle with the lever rotation point as the center. When the liquid level changes, the float position is controlled to change, so that the lever rotates. The lever rotation changes the position of the sliding terminal on the sliding rheostat, realizing the change of the circuit resistance. The sliding rheostat is usually set to an arc concentric with the lever hinge point. When the liquid level changes, the change in the liquid level height is difficult to accurately reflect the change in the resistance of the sliding rheostat. For example, when a car is driving smoothly and the gasoline consumption indicated on the dashboard is recorded twice in a row, the two recorded consumptions indicated by the dashboard are the same, which means that the resistance change of the sliding rheostat is the same, that is, the sliding terminal on the sliding rheostat in the two records is the same. The displacement distances Δx and Δx' are the same, which means that the rotation angles ∠α and ∠α' of the lever in the two records are the same, but the data reflecting the change in the liquid level height is the change in the height of the float. In the two records, the longitudinal displacements caused by the same rotation angle of the lever are d and d' respectively. Obviously, d>d'. Therefore, in the two consecutive records showing the same fuel consumption on the dashboard, the fuel consumption is not equal. Only when the fuel tank has a spatial structure with a small top and a large bottom, and the oil volume in the transverse cross-sectional range corresponding to the range d is the same as the oil volume in the transverse cross-sectional range corresponding to the range d', the traditional float sensor has the effect of accurate measurement. However, it is obvious that it has great limitations in actual production.

[0038] Reference Figure 2-6 In order to make the longitudinal displacement of the float 4 positively correlated with the change in the resistance value of the variable resistance component 2, so that the indicated value of the instrument panel is consistent with the actual consumption in the tank, a vertical resistance bar 22 is set, and the driving structure makes the longitudinal displacement of the sliding block 24 positively correlated with the longitudinal displacement of the float 4. The driving structure includes a guide rod 26 fixedly set on the outer wall of the sliding block 24, and a guide groove 261 is opened on the guide rod 26. The guide rod 26 is horizontally set, and a pressure rod 31 is set on the side wall of the lever wire 3. The pressure rod 31 extends into the guide groove 261 and abuts against the inner wall of the guide groove 261. The pressure rod 31 can move laterally in the guide groove 261. When the float 4 When the lever wire 3 is driven to rotate, the pressure rod 31 presses against the inner wall of the guide groove 261, pushing the guide rod 26 to move, wherein the pressure rod 31 makes an arc motion like the float 4 as the lever wire 3 rotates, and the lateral displacement of the pressure rod 31 occurs in the guide groove 261, and the longitudinal movement of the pressure rod 31 drives the guide rod 26 to move longitudinally, and then drives the sliding block 24 to move longitudinally, realizing the resistance value change of the resistor bar 22. In this process, the longitudinal displacement distance of the sliding block 24 and the longitudinal position distance of the float 4 and the change in the gasoline liquid level are all positively correlated, so that the indication value on the instrument panel is consistent with the actual consumption of gasoline, thereby improving the accuracy of fuel tank liquid level monitoring.

[0039] Reference Figure 4-5A slot 211 is provided on the side wall of the rectangular frame 21, and the sliding block 24 is U-shaped. The open end of the sliding block 24 is clamped on the rectangular frame 21, and a clamping block 241 adapted to the slot 211 is provided on the inner side wall of the sliding block 24. The slot 211 and the clamping block 241 cooperate with each other to limit the movement direction of the sliding block 24, thereby ensuring that the sliding block 24 does not deflect when moving in the vertical direction, thereby improving the stability of the movement of the sliding block 24.

[0040] Reference Figure 4-5 A plurality of rollers 242 are arranged in an array inside the block 241, and the outer circumference of the rollers 242 abuts against the inner wall of the slot 211. The rollers 242 can reduce the friction resistance between the sliding block 24 and the slot 211, thereby improving the flexibility of the sliding block 24 during displacement.

[0041] Reference Figure 2-6 Since the conductive sheet 23 can change its shape as needed, the distance between the resistor bar 22 and the conductive sheet 23 can be changed. In order to ensure the stability of the current path between the resistor bar 22 and the conductive sheet 23, the length of the variable resistance connecting member 25 can be adaptively changed. Specifically, the variable resistance connecting member 25 includes a conductive guide frame 251 fixedly arranged on the sliding block 24. A contact 252 is arranged at one end of the guide frame 251 close to the resistor bar 22. The contact 252 penetrates the sliding block 24 and abuts against the surface of the resistor bar 22, so that the resistor bar 22 and the guide frame 251 are in an electrically connected state. A conductive ring 253 is installed on the side of the guide frame 251 close to the conductive sheet 23. A resistor column 254 is slidably arranged on the conductive ring 253. A spring 255 is arranged between the resistor column 254 and the guide frame 251. The resistor column 254 is extended outward to abut against the surface of the conductive sheet 23. The current passes through the guide frame 251 and the conductive ring 253, and is conducted to the conductive sheet 23 through the resistor column 254 to form a complete electrical path. Under the elastic force of the spring 255, when the distance between the resistor bar 22 and the conductive sheet 23 changes, the spring 255 can always keep the resistor column 254 in contact with the conductive sheet 23 to maintain the path. When the distance between the resistor bar 22 and the conductive sheet 23 changes, the elongation of the resistor column 254 is also different, so the actual resistance generated by the resistor column 254 is also different, so that the resistance change of the variable resistor component 2 can adapt to different oil tanks. An insulating plate 256 is provided between the resistor column 254 and the spring 255 to prevent the spring 255 from directly introducing the current from the end of the guide frame 251 close to the contact 252 into the resistor column 254.

[0042] The conductive sheet 23 is an elastic metal sheet. The deformation of the conductive sheet 23 is elastic. The conductive sheet 23 can be twisted and deformed under the action of an external force and recover after the external force is removed.

[0043] Specifically, when designing a car fuel tank, the overall layout of the car is usually combined with the rational use of the internal space. Therefore, the car fuel tank is usually a special-shaped structure. Therefore, the area of ​​each cross-section of the fuel tank is different, which means that when the gasoline liquid level at different positions in the fuel tank drops to the same height, the actual amount of fuel consumed is not the same. Therefore, even if the change in the gasoline liquid level is proportional to the change in the resistance of the resistor bar 22, it is impossible to accurately judge the fuel consumption in the fuel tank. By changing the shape of the conductive sheet 23, the resistance change of the variable resistor component 2 is affected by the resistance of the resistor column 254 in addition to the resistance change of the resistor bar 22 itself. The resistance change of the resistor column 254 is compensated for the resistance change of the resistor bar 22 to ensure that the numerical display on the instrument panel can match the actual fuel consumption, thereby more accurately judging the fuel level in the fuel tank.

[0044] The resistor column 254 is in contact with the conductive ring 253 for conducting electricity, and the current enters the resistor column 254 from the conductive ring 253. The portion of the resistor column 254 between the conductive ring 253 and the conductive sheet 23 is the energized portion. Therefore, after the conductive sheet 23 moves away from the resistor bar 22, the resistor column 254 stretches, and the overall resistance value of the variable resistor assembly 2 increases, and vice versa. The resistor column 254 can be calibrated according to the shape of the automobile fuel tank, and the shape of the conductive sheet 23 can be controlled according to the calibrated value, so that the conductive sheet 23 corresponding to the portion with a small cross section of the fuel tank is close to the resistor bar 22, and the fuel tank cross section is small. The conductive sheet 23 corresponding to the part is away from the resistor bar 22. If the real-time resistance value of the resistor bar 22 is R1, and the real-time resistance value of the resistor column 254 is R2, then the total resistance R fed back by the variable resistance component 2 on the main body 1 is R1+R2. When the fuel tank is full of gasoline, the float 4 is at the highest position, and the sliding block 24 and the variable resistance connector 25 are also at the highest position. At this time, R is the minimum value of the system. As the gasoline is consumed, the liquid level moves down, and the resistance value of R1 increases, R↑=R1↑+R2, and the total resistance R increases, causing the instrument panel reading to decrease. When the fuel tank is cut off, When the cross-section of the fuel tank is smaller, the amount of fuel consumed when the liquid level drops is less than normal. At this time, the corresponding conductive sheet 23 becomes farther away from the resistor bar 22, and the resistance value of R2 increases, R↑=R1↑+R2↑, and the total resistance R rises faster. Therefore, the reading displayed on the instrument panel decreases faster as the fuel consumption decreases, corresponding to the higher fuel consumption in this state. When the cross-section of the fuel tank is smaller, the amount of fuel consumed when the liquid level drops is less than normal. At this time, the corresponding conductive sheet 23 becomes closer to the resistor bar 22, and the resistance value of R2 decreases, R↑=R1↑+R2↓. Although the total resistance R still increases, the increase rate of the total resistance R is reduced by reducing the resistance value of R2. Therefore, the reading displayed on the instrument panel decreases more slowly as the fuel consumption decreases, corresponding to the lower fuel consumption in this state. Therefore, the liquid level sensor can reflect the actual fuel amount change in the fuel tank, rather than a simple fuel level change, which can effectively solve the nonlinear effect of the fuel tank shape on the relationship between the liquid level height and the fuel amount, and improve the accuracy and reliability of the fuel amount monitoring system.

[0045] Reference Figure 2-7A plurality of adjusting rods 27 are linearly arrayed on the rectangular frame 21, and the adjusting rods 27 are threadedly connected to the rectangular frame 21. The axial movement of the adjusting rods 27 can be controlled by rotating the adjusting rods 27. A half-open clamping strip 271 is rotatably arranged at one end of the adjusting rod 27 close to the conductive sheet 23. The conductive sheet 23 passes through all the clamping strips 271. An external force is applied to the conductive sheet 23 by controlling the position of the adjusting rod 27 to control the deformation of the conductive sheet 23. The conductive sheet 23 is fixedly connected to the top clamping strip 271 to ensure that the position of the conductive sheet 23 is stable. The conductive sheet 23 is slidably connected to the remaining clamping strips 271. The length of the conductive sheet 23 is greater than the resistor strip 22, so that the change in length position when the conductive sheet 23 is deformed is compensated by sliding on the clamping strip 271.

[0046] Reference Figure 2 and 8 The float 4 includes an outer cylinder 41, and a plurality of liquid permeable holes 43 are provided on the outer peripheral surface of the outer cylinder 41. An elastic airbag 42 is sealed and attached inside the outer cylinder 41. The elastic airbag 42 fills the interior of the outer cylinder 41. The elastic airbag 42 will deform under external force. A pressure sensor 44 electrically connected to the main body 1 is arranged in the elastic airbag 42. Since the float 4 needs to reach a certain draft to float, of course, when the fuel liquid level drops below the draft that can generate buoyancy, the remaining fuel amount cannot be detected by the resistance change of the variable resistance component 2. The initial value set by the instrument panel in this state is not zero. The remaining fuel cylinder acts on the elastic airbag 42 through the liquid permeable holes 43, and the liquid pressure generated on the elastic airbag 42 causes the elastic airbag 42 to deform. The air pressure in the elastic airbag 42 increases and acts on the pressure sensor 44, and the pressure change is converted into an electrical signal and transmitted to the instrument panel, so that the remaining fuel amount can be monitored even when the fuel amount is low, further improving the accuracy of the fuel tank level monitoring.

[0047] The specific working principle of the present invention is as follows:

[0048] First, the sensor is calibrated according to the fuel tank, and the shape of the conductive sheet 23 is adjusted. After the calibration is completed, the sensor with the conductive sheet 23 of the fixed shape can be directly mass-produced. The main body 1 is installed on the inner wall of the automobile fuel tank, and the main body 1 is connected to the instrument panel of the automobile cab;

[0049] When the fuel tank is fully filled, the float 4 is at the highest position, and the sliding block 24 and the variable resistance connecting piece 25 are also at the highest position. As the gasoline is consumed, the liquid level moves downward, and the float 4 drives the lever wire 3 to rotate downward, and the pressure rod 31 presses the inner wall of the guide groove 261 to push the guide rod 26 to move, wherein the pressure rod 31 makes an arc motion like the float 4 as the lever wire 3 rotates, and the lateral displacement of the pressure rod 31 occurs in the guide groove 261, and the longitudinal movement of the pressure rod 31 drives the guide rod 26 to move longitudinally, and then drives the sliding block 24 to move longitudinally, realizing the change of the resistance value of the resistor 22. In this process, the longitudinal displacement distance of the sliding block 24 and the longitudinal position distance of the float 4 and the change of the gasoline liquid level are all positively correlated;

[0050] The resistor column 254 contacts the conductive ring 253 for conduction, and the current enters the resistor column 254 from the conductive ring 253 and passes into the conductive sheet 23. The shape of the conductive sheet 23 is controlled according to the calibrated value, so that the conductive sheet 23 corresponding to the part with a small cross-section of the fuel tank is close to the resistor bar 22, and the conductive sheet 23 corresponding to the part with a small cross-section of the fuel tank is far away from the resistor bar 22. When encountering a part with a larger cross-section of the fuel tank, the amount of fuel consumed when the liquid level drops is more than normal, and at this time the corresponding conductive sheet 23 is farther away from the resistor bar 22, and the reading displayed on the instrument panel decreases faster with the decrease in fuel consumption, corresponding to a higher fuel consumption in this state. When encountering a part with a smaller cross-section of the fuel tank, the amount of fuel consumed when the liquid level drops is less than normal, and at this time the corresponding conductive sheet 23 is closer to the resistor bar 22, and the reading displayed on the instrument panel decreases more slowly with the decrease in fuel consumption, corresponding to a lower fuel consumption in this state. Therefore, the liquid level sensor can reflect the actual fuel amount change in the fuel tank, which can effectively solve the nonlinear effect of the fuel tank shape on the relationship between the liquid level height and the fuel amount, and improve the accuracy and reliability of the fuel amount monitoring system.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An automobile liquid level sensor, comprising a main body (1), a variable resistance component (2), a lever wire (3) and a float (4), characterized in that: in: The main body (1) is mounted on the inner wall of the automobile fuel tank; A variable resistance component (2) comprises a rectangular frame (21) fixed to a side wall of a main body (1); a resistance bar (22) is arranged on one side of the rectangular frame (21) in a vertical direction; a deformable conductive sheet (23) is arranged on the other side of the rectangular frame (21); the conductive sheet (23) corresponds to the resistance bar (22); the tops of the resistance bar (22) and the conductive sheet (23) are respectively electrically connected to the main body (1) through wires; a sliding block (24) is arranged on the rectangular frame (21) for longitudinal sliding; a variable resistance connecting member (25) connecting the resistance bar (22) and the conductive sheet (23) is arranged on the sliding block (24); when the sliding block (24) changes its longitudinal position, the resistance value of the variable resistance component (2) changes synchronously; A lever wire (3), the end of which is rotatably arranged on the main body (1), and a driving structure is arranged between the lever wire (3) and the sliding block (24); The float (4) is fixedly arranged at one end of the lever wire (3) away from the main body (1), and the overall density of the float (4) is less than that of gasoline.

2. The automobile liquid level sensor according to claim 1, characterized in that: The side wall of the rectangular frame (21) is provided with a slot (211); the sliding block (24) is U-shaped; the open end of the sliding block (24) is clamped on the rectangular frame (21); and a clamping block (241) adapted to the slot (211) is provided on the inner side wall of the sliding block (24).

3. The automobile liquid level sensor according to claim 2, characterized in that: A plurality of rollers (242) are distributed in an array inside the clamping block (241), and the outer peripheral surfaces of the rollers (242) abut against the inner wall of the clamping groove (211).

4. The automobile liquid level sensor according to claim 1, characterized in that: The driving structure comprises a guide rod (26) fixedly arranged on the outer wall of the sliding block (24), a guide groove (261) being provided on the guide rod (26), the guide rod (26) being arranged horizontally, and a pressure rod (31) being arranged on the side wall of the lever wire (3), the pressure rod (31) extending into the guide groove (261) and abutting against the inner wall of the guide groove (261).

5. The automobile liquid level sensor according to claim 1, characterized in that: The variable resistance connecting member (25) comprises a conductive guide frame (251) fixedly arranged on the sliding block (24); a contact point (252) is arranged at one end of the guide frame (251) close to the resistor bar (22); the contact point (252) penetrates the sliding block (24) and abuts against the surface of the resistor bar (22); a conductive ring (253) is installed on one side of the guide frame (251) close to the conductive sheet (23); a resistor column (254) is slidably arranged on the conductive ring (253); a spring (255) is arranged between the resistor column (254) and the guide frame (251) so that the resistor column (254) extends outward and abuts against the surface of the conductive sheet (23).

6. The automobile liquid level sensor according to claim 5, characterized in that: An insulating plate (256) is provided between the resistance column (254) and the spring (255).

7. The automobile liquid level sensor according to claim 1, characterized in that: The conductive sheet (23) is an elastic metal sheet, and the deformation of the conductive sheet (23) is elastic deformation.

8. The automobile liquid level sensor according to claim 1, characterized in that: A plurality of adjusting rods (27) are distributed in a linear array on the rectangular frame (21), the adjusting rods (27) are threadedly connected to the rectangular frame (21), a half-open clamping strip (271) is rotatably arranged at one end of the adjusting rod (27) close to the conductive sheet (23), the conductive sheet (23) passes through all the clamping strips (271), the conductive sheet (23) is fixedly connected to the top clamping strip (271), and the conductive sheet (23) is slidably connected to the remaining clamping strips (271).

9. The automobile liquid level sensor according to claim 1, characterized in that: The float (4) comprises an outer cylinder (41), the outer peripheral surface of which is provided with a plurality of liquid-permeable holes (43), an elastic airbag (42) is sealed in the outer cylinder (41), and a pressure sensor (44) electrically connected to the main body (1) is arranged in the elastic airbag (42).

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