Wireless intelligent liquid level tank cover and fuel management system
Patent Information
- Application Number
- CN202611328413.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-31
- Publication Date
- 2026-10-20
AI Technical Summary
若探杆与油箱盖永久固定，则产品型号多、维修困难；若采用普通螺纹或外部接头连接，又可能增加泄漏路径
[0005]具体实施方式：如图1至图3所示，无线智能液位油箱盖100包括油箱盖本体10、电池快拆盖11、电池容纳仓12、PCB板13、钢管压板14、氟橡胶油箱密封垫15、电子仓16、防水硅胶按键17、电子仓密封圈18、电池仓密封圈19、不锈钢管20、钢管密封圈21、钢管外翻边22、NBR磁浮子30、钢管密封堵头31、独立呼吸气道40、防水透气膜41、防水透气膜固定扣42和隔离壁43。油箱盖本体10具有与油箱加注口配合的内螺纹或卡口，氟橡胶油箱密封垫15在油箱盖旋紧后与油箱口端面形成密封。不锈钢管20优选为304不锈钢管，其电子仓侧端部通过扩口、卷边、旋压或冲压形成径向延伸的钢管外翻边22。装配时，不锈钢管20从电子仓16向油箱内部穿过油箱盖本体10的钢管安装孔，钢管外翻边22抵靠钢管安装孔电子仓侧的环形台阶，钢管密封圈21设置于钢管外翻边22、环形台阶和不锈钢管20之间。钢管压板14通过螺钉、卡扣或其他紧固结构固定在电子仓16内，其环形压紧部沿不锈钢管20的轴向压紧钢管外翻边22，使钢管密封圈21达到预定压缩量，并对不锈钢管20进行轴向机械限位。NBR磁浮子30内置永磁体并滑动套设于不锈钢管20。钢管油箱侧端部安装钢管密封堵头31，钢管密封堵头31同时封闭管腔并限制NBR磁浮子30脱出。PCB板13上设置沿不锈钢管20轴向分布的干簧管、霍尔元件或其他磁传感器。不同长度的不锈钢管20保持相同的外径、钢管外翻边22尺寸、钢管密封圈21配合尺寸和钢管密封堵头31接口。独立呼吸气道40从油箱内部延伸至外界，防水透气膜41设置在独立呼吸气道40的膜片安装位，并由防水透气膜固定扣42压持或卡持。隔离壁43使独立呼吸气道40与电子仓16之间无通孔、无共用腔体。防水透气膜41的有效补气能力按最大理论耗油对应补气量留有裕量。电子仓16由电子仓密封圈18与后侧壳体密封。防水硅胶按键17穿过壳体的按键安装位，并可带有指示灯透光部。电池容纳仓12位于电子仓后侧，电池快拆盖11通过旋转卡扣或螺纹与电池容纳仓12连接，电池仓密封圈19在二者之间形成独立密封；打开电池快拆盖11不会破坏钢管密封圈21、电子仓密封圈18或氟橡胶油箱密封垫15。如图4所示，油箱盖100通过BLE向控制开关200发送液位、电量、温度、状态和事件数据；控制开关200通过UART、LIN或其他有线接口与ECU300通信并取得启停、档位、油泵频率、运行时间和故障状态；控制开关200还通过BLE、Wi-Fi或移动通信与APP或云平台400通信。油箱盖100不直接与ECU300通信。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of fuel tank level detection and wireless Internet of Things (IoT) equipment, and particularly to a wireless intelligent fuel tank cap and fuel management system that integrates a level probe, an electronic compartment, an independent fuel tank breathing duct, and a wireless communication module into the fuel tank cap. Background Technology
[0002] Current parking heater fuel tanks typically employ transparent enclosures for visual inspection, mechanical floats, or independent wired level sensors. Visual inspection and mechanical floats cannot output digital signals, while wired sensors require additional drilling and wiring, posing higher installation and sealing risks. Placing electronic components directly inside a standard fuel tank cap can easily lead to cross-contamination between the fuel tank area, the fuel tank's venting duct, and the electronic compartment. Furthermore, different fuel tank depths require different lengths of level probes. If the probe is permanently fixed to the fuel tank cap, there are many product models available, making maintenance difficult; using standard threads or external connectors may increase leakage paths. Existing technologies also often allow fuel tank venting through the electronic compartment, potentially allowing fuel vapor, condensate, and external moisture to enter the electronic area, affecting safety and lifespan. Summary of the Invention
[0003] The technical problem to be solved by this invention is to achieve liquid level detection, wireless transmission, modular replacement of probes, reliable isolation of the electronic compartment, and independent gas replenishment of the oil tank without changing the main interface of the oil tank, while reducing the impact of installation and maintenance on the main seal. To address the aforementioned issues, the fuel tank cap body is equipped with isolated liquid level zones, an electronic compartment, and an independent breathing airway. A stainless steel tube passes through a steel tube mounting hole from the electronic compartment side to the fuel tank side. The end of the stainless steel tube on the electronic compartment side forms an outward flange. A steel tube sealing ring is positioned between the outward flange and the fuel tank cap body. A steel tube pressure plate is fixed inside the electronic compartment and axially presses the outward flange, creating a static seal between the outward flange, the steel tube sealing ring, and the fuel tank cap body, and axially limiting the movement of the stainless steel tube. An NBR float is fitted onto the stainless steel tube and contains a built-in magnet. A steel tube sealing plug is installed at the fuel tank side end of the steel tube. The independent breathing airway connects to the outside through a waterproof and breathable membrane, and a positioning diaphragm is fixed using the waterproof and breathable membrane. The independent breathing airway is not connected to the electronic compartment. The electronic compartment also includes a waterproof silicone button, an electronic compartment sealing ring, a battery compartment, a battery compartment sealing ring, and a quick-release battery cover. Compared with existing technologies, this invention has at least the following advantages: the outer flange of the stainless steel pipe provides reliable axial mechanical restraint; the steel pipe pressure plate applies a stable preload to the outer flange and the steel pipe sealing ring, ensuring that the steel pipe fixing and fuel sealing work together; steel pipes of different lengths can maintain a uniform outer flange, sealing ring, and pressure plate interface. The liquid level area, breathing airway, and electronic compartment constitute three independent paths; fuel tank air replenishment does not pass through the electronic compartment, reducing the risk of negative pressure in the fuel tank and preventing fuel vapor and condensate from entering the electronic area; the control switch, as a data fusion center, can be compatible with different heaters without modifying the ECU Bluetooth hardware.
[0004] Attached image description: Figure 1 This is an axially exploded diagram of the wireless intelligent liquid level tank cover. Figure 2 This is a partial cross-sectional schematic diagram of the steel pipe's outer flange, sealing ring, and pressure plate. Figure 3 This diagram illustrates the isolation relationship between the liquid level area, the electronic compartment, and the independent breathing airway. Figure 4 This is a schematic diagram of the communication architecture of the fuel management system.
[0005] Detailed implementation methods: such as Figures 1 to 3As shown, the wireless intelligent liquid level tank cover 100 includes a tank cover body 10, a battery quick-release cover 11, a battery housing 12, a PCB board 13, a steel pipe pressure plate 14, a fluororubber tank sealing gasket 15, an electronic compartment 16, a waterproof silicone button 17, an electronic compartment sealing ring 18, a battery compartment sealing ring 19, a stainless steel pipe 20, a steel pipe sealing ring 21, a steel pipe outward flange 22, an NBR magnetic float 30, a steel pipe sealing plug 31, an independent breathing airway 40, a waterproof and breathable membrane 41, a waterproof and breathable membrane fixing buckle 42, and an isolation wall 43. The tank cover body 10 has an internal thread or snap-fit that mates with the tank filling port. The fluororubber tank sealing gasket 15 forms a seal with the tank opening end face after the tank cover is tightened. The stainless steel pipe 20 is preferably a 304 stainless steel pipe, and its electronic compartment side end is formed into a radially extending steel pipe outward flange 22 by flaring, rolling, spinning, or stamping. During assembly, the stainless steel tube 20 passes through the steel tube mounting hole of the oil tank cover body 10 from the electronic compartment 16 into the oil tank. The outer flange 22 of the steel tube abuts against the annular step on the electronic compartment side of the steel tube mounting hole. The steel tube sealing ring 21 is disposed between the outer flange 22, the annular step, and the stainless steel tube 20. The steel tube pressure plate 14 is fixed in the electronic compartment 16 by screws, clips, or other fastening structures. Its annular pressing part presses the outer flange 22 of the steel tube along the axial direction of the stainless steel tube 20, so that the steel tube sealing ring 21 reaches a predetermined compression amount and provides axial mechanical limitation for the stainless steel tube 20. The NBR magnetic float 30 has a built-in permanent magnet and is slidably sleeved on the stainless steel tube 20. A steel tube sealing plug 31 is installed at the oil tank side end of the steel tube. The steel tube sealing plug 31 simultaneously seals the tube cavity and restricts the NBR magnetic float 30 from falling out. Reed switches, Hall elements, or other magnetic sensors are distributed along the axial direction of the stainless steel tube 20 on the PCB board 13. Stainless steel pipes 20 of different lengths maintain the same outer diameter, pipe flange 22 dimensions, pipe sealing ring 21 fitting dimensions, and pipe sealing plug 31 interface. An independent breathing airway 40 extends from inside the fuel tank to the outside. A waterproof and breathable membrane 41 is installed at the membrane mounting position of the independent breathing airway 40 and is held or secured by a waterproof and breathable membrane fixing buckle 42. An isolation wall 43 ensures that there are no through holes or shared cavities between the independent breathing airway 40 and the electronic compartment 16. The effective air replenishment capacity of the waterproof and breathable membrane 41 has a margin corresponding to the maximum theoretical fuel consumption. The electronic compartment 16 is sealed to the rear housing by an electronic compartment sealing ring 18. A waterproof silicone button 17 passes through the button mounting position of the housing and may include a light-transmitting indicator light section. The battery compartment 12 is located behind the electronic compartment. The quick-release battery cover 11 is connected to the battery compartment 12 via a rotating buckle or threads. The battery compartment sealing ring 19 forms an independent seal between the two. Opening the quick-release battery cover 11 will not damage the steel pipe sealing ring 21, the electronic compartment sealing ring 18, or the fluororubber fuel tank sealing gasket 15. Figure 4As shown, the fuel tank cap 100 sends fuel level, power, temperature, status, and event data to the control switch 200 via BLE; the control switch 200 communicates with the ECU 300 via UART, LIN, or other wired interfaces to obtain start / stop, gear position, fuel pump frequency, running time, and fault status; the control switch 200 also communicates with the APP or cloud platform 400 via BLE, Wi-Fi, or mobile communication. The fuel tank cap 100 does not communicate directly with the ECU 300.
Claims
1. A wireless intelligent liquid level tank cover, comprising a tank cover body, an electronic compartment, a stainless steel tube, a float, and a wireless electronic assembly, characterized in that: The fuel tank cap body has a steel pipe mounting hole extending from the electronic compartment side to the fuel tank side; the stainless steel pipe passes through the steel pipe mounting hole from the electronic compartment side to the fuel tank side, and the end of the stainless steel pipe on the electronic compartment side has a radially outward-flared steel pipe flange; a steel pipe sealing ring is provided between the steel pipe flange and the fuel tank cap body; a steel pipe pressure plate is provided inside the electronic compartment, the steel pipe pressure plate is fixed to the fuel tank cap body and presses the steel pipe flange against the fuel tank cap body along the axial direction of the stainless steel pipe, so that the steel pipe sealing ring forms a static seal and axially limits the stainless steel pipe; the fuel tank cap body also has an independent breathing airway, which is connected to the outside and the inside of the fuel tank through a waterproof and breathable membrane and isolated from the electronic compartment.
2. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The steel pipe pressure plate has a central hole through which the stainless steel pipe passes and an annular pressing part around the central hole. The annular pressing part directly or via a gasket presses against the outer flange of the steel pipe. The steel pipe pressure plate is fixed to the fuel tank cover body by screws or clips.
3. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The steel pipe mounting hole has an annular step or groove on the electronic compartment side, and the steel pipe sealing ring is located in the annular step or groove and is jointly defined by the outer flange of the steel pipe and the steel pipe pressure plate.
4. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The outer flange of the steel pipe is formed by flaring, rolling, spinning or stamping the end of the stainless steel pipe, and the steel pipe sealing ring is a fuel-resistant elastic sealing ring.
5. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The float is an NBR float sleeved on the outer periphery of the stainless steel tube and has a built-in magnet; the wireless electronic assembly includes a reed switch or a Hall sensor arranged along the axial direction of the stainless steel tube.
6. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: A steel pipe sealing plug is provided at the oil tank side end of the stainless steel pipe. The steel pipe sealing plug seals the cavity of the stainless steel pipe and restricts the axial travel of the float.
7. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The waterproof and breathable membrane is installed at the membrane mounting position of the independent breathing airway and is fixedly fastened or held by the waterproof and breathable membrane.
8. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The electronic compartment has an electronic compartment sealing ring, and the independent breathing airway is separated from the electronic compartment by a continuous isolation wall; a fluororubber fuel tank sealing gasket is provided between the fuel tank cap body and the fuel tank opening.
9. The wireless intelligent liquid level tank cover according to claim 1, characterized in that: The electronic compartment includes a battery compartment, a quick-release battery cover, and a battery compartment sealing ring. The quick-release battery cover is connected to the battery compartment by a rotating buckle or threads. The electronic compartment also includes a waterproof silicone button with an indicator light-transmitting part.
10. A fuel management system, characterized in that, The invention includes the wireless intelligent fuel level tank cap, control switch, heater ECU, and terminal application as described in any one of claims 1 to 9; the wireless intelligent fuel level tank cap sends fuel level data to the control switch via low-power wireless communication, the control switch obtains operating parameters from the heater ECU via wired communication, and generates fuel status information based on the fuel level data and the operating parameters before sending it to the terminal application.
11. The fuel management system according to claim 10, characterized in that: The wireless intelligent liquid level tank cover does not communicate directly with the heater ECU. The control switch serves as the pairing, data receiving, data fusion, display, and forwarding center for the wireless intelligent liquid level tank cover.
12. A method for assembling the wireless intelligent liquid level tank cover according to claim 1, characterized in that, include: An outward flange is formed at one end of a stainless steel tube; a steel tube sealing ring is placed in the steel tube mounting hole of the fuel tank cap body; the stainless steel tube passes through the steel tube mounting hole from the electronic compartment side to the fuel tank side until the outward flange of the steel tube abuts against the fuel tank cap body; a steel tube pressure plate is installed and the outward flange of the steel tube is axially pressed; a waterproof and breathable membrane is installed and positioned using a waterproof and breathable membrane fixing buckle; and the electronic compartment is closed after confirming that the independent breathing airway is not connected to the electronic compartment.