Compressed natural gas automobile alarm system and method

Abstract

The invention relates to the technical field of natural gas automobiles, and discloses a compressed natural gas automobile alarm system and method.The compressed natural gas automobile alarm system comprises an automobile gas filling port, a micro pressure sensor is arranged on the outer side of the gas filling port, and anti-static measures are arranged on the micro pressure sensor; a protective cap is pressed outside the micro pressure sensor in a sleeving manner; the miniature pressure sensor is electrically connected with the data processor, the data processor is electrically connected with the alarm, and the alarm is arranged on a vehicle instrument desk. Whether the protective cap falls off or not is judged by obtaining the pressure value of the protective cap and judging the state information of the protective cap and the gas filling port, so that the protective cap can be found and processed in time, and safety risks are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas vehicles, and in particular to a compressed natural gas vehicle alarm system and method. Background Art

[0002] Compressed natural gas (CNG) vehicles have been widely popularized and promoted around the world for their low emissions, high economy and significant advantages in helping to reduce dependence on oil resources. As a leader in this field, my country's natural gas vehicle ownership has long been ranked first in the world, and its export volume has always remained at the forefront of the world. In order to further promote the development of natural gas vehicles, the use of higher pressure (35MPa) compressed natural gas vehicles is now also being vigorously promoted to achieve longer driving range and higher energy efficiency.

[0003] However, during the use of CNG vehicles, the protective cap of the gas filling port often falls off. If it is not discovered and handled in time, the one-way valve inside the gas filling port will be exposed to the external environment for a long time and will be corroded by water and dust, which will lead to sealing failure and gas leakage.

[0004] What is more serious is that once there is a gas leak at the gas filling port, if there is a fire source at this time, it is very easy to cause a safety accident of accidental fire of the vehicle. In fact, in the actual operation of compressed natural gas vehicles, there have been many vehicle fire accidents caused by gas leakage at the gas filling port. These accidents not only bring huge economic losses, but also pose a serious threat to people's lives and safety. Summary of the invention

[0005] The present invention is intended to provide a compressed natural gas vehicle alarm system and method to solve the problem that the gas filling port protective cap cannot be detected in time when it falls off in the prior art, resulting in the problem that the gas filling port leakage cannot be detected in time, thus causing safety hazards.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme, a compressed natural gas automobile alarm system and method, in which a micro pressure sensor is installed at the gas filling port, and the status information of the protective cap and the gas filling port is judged by obtaining the pressure value of the protective cap, thereby judging whether the protective cap has fallen off, so as to be able to discover and deal with it in time to avoid safety risks. The alarm system includes a vehicle gas filling port, a micro pressure sensor is provided on the outside of the gas filling port, and anti-static measures are provided on the micro pressure sensor; a protective cap is pressed on the outside of the micro pressure sensor; the micro pressure sensor is electrically connected to a data processor, and the data processor is electrically connected to an alarm, and the alarm is arranged on the vehicle dashboard.

[0007] At the same time, the present invention also provides a CNG vehicle alarm method, which is applied to the CNG vehicle alarm system, and includes the following steps:

[0008] Step 1, obtaining the current pressure value data of the protective cap through a micro pressure sensor; transmitting the pressure value data to a data processor;

[0009] Step 2, judging the status information of the protective cap and the gas filling port according to the pressure value data;

[0010] Step 3: Issue an alarm based on the status information.

[0011] The principles and advantages of this solution are:

[0012] In existing natural gas vehicle applications, since compressed natural gas is highly flammable, any factors that may cause sparks, static electricity accumulation or dust accumulation may become the fuse of an explosion. The gas filling port is a key part that connects the CNG vehicle to the gas supply equipment, and its design must strictly follow safety regulations to effectively prevent the risk of explosion. Therefore, in the current structural design of the gas filling port, it is usually adopted to streamline the configuration of components around the gas filling port, reduce electrical components and connection points, so as to reduce the static electricity generated by circuit components, avoid static electricity accumulation to a level sufficient to ignite CNG gas, and cause the possibility of electric sparks or explosions. Therefore, it is not considered to set component structures that may increase safety risks in the gas filling port area.

[0013] Therefore, in the prior art, it is difficult to detect the phenomenon of gas leakage at the gas filling port in time. Even if there are corresponding monitoring devices, the monitoring devices are set up in other parts to monitor the gas volume in a certain area through the monitoring devices. When the gas volume in the area reaches the set limit, an early warning is issued. However, if a gas leakage occurs, but the leaked gas does not reach a certain amount, no alarm will be issued, and it will not be discovered and handled in time. Although the current amount of leakage may not immediately cause a safety accident, there are safety hazards. If it encounters non-directional factors such as fire sources, it will cause immeasurable explosion safety accidents.

[0014] This solution breaks away from the conventional gas leak monitoring mode. It does not monitor the gas after it has leaked, but monitors the protective cap of the gas filling port before the leak. By monitoring the pressure value of the protective cap, it can be determined in time whether the protective cap has fallen off. If it has fallen off, it can be dealt with in time to eliminate the leakage from the source.

[0015] At the same time, this solution reduces the circuit connection structure of the micro pressure sensor as much as possible, and sets an electrostatic layer on the outside of the micro pressure sensor, so as to take electrostatic protection measures for the micro pressure sensor to ensure that the installed micro pressure sensor can meet the standard of reducing the risk of explosion. Therefore, the protective cap can be monitored by directly setting a micro pressure sensor at the gas filling port to achieve the effect of early prevention and timely treatment.

[0016] Furthermore, the size of the micro pressure sensor is 20*10 mm, and the anti-static measure is grounding through a frame grounding wire.

[0017] Furthermore, the micro pressure sensor is arranged at a distance of 10-15 mm from the end of the gas filling port, so as to ensure that there is a certain distance between the micro pressure sensor and the end of the gas filling port, so as to further reduce the influence of the electrical components on the gas filling port.

[0018] Furthermore, a convex surface is provided on the surface of the gas filling port, and the micro pressure sensor is arranged on the convex surface, so as to ensure that the micro pressure sensor can feel the pressing force of the protective cap.

[0019] Furthermore, the height of the raised surface is 2-3 mm. If the raised surface is too small, it is difficult to ensure accurate sensing of the pressure of the protective cap, and if the raised surface is too large, it is difficult to ensure convenient installation of the protective cap.

[0020] Furthermore, the protective cap is a rubber protective cap.

[0021] Furthermore, the status information includes completely disengaged, about to be disengaged, possibly disengaged, loose, and not disengaged.

[0022] Furthermore, in step 2, it also includes obtaining the current driving information of the vehicle and determining the state information of the protective helmet according to the driving information.

[0023] Furthermore, the driving information includes vehicle driving parameters and driving path information, and a prediction is made and a prompt is given based on the current status information of the protective cap and the gas filling port. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic structural diagram of a compressed natural gas vehicle alarm system.

[0025] Figure 2 The diagram is a partial structural diagram of a compressed natural gas vehicle alarm system according to the present invention.

[0026] Figure 3 The present invention is a schematic flow chart of a CNG vehicle alarm method. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The reference numerals in the drawings of the specification include: gas filling port 1, protective cap 2, micro pressure sensor 3, data processor 4, alarm 5, connecting rope 6, raised surface 7, and lifting ring 8.

[0029] Embodiment 1

[0030] This embodiment is basically as shown in the attached Figure 1 As shown, a compressed natural gas vehicle alarm system is provided, in which a micro pressure sensor is installed at the gas filling port. When the gas filling port protective cap is installed, the device displays normal; when the gas filling port protective cap is not installed, the micro pressure sensor detects an abnormality (no pressure), and an alarm is used to promptly warn the driver that the gas filling port protective cap abnormality needs to be handled, thereby preventing leakage of the gas filling port in advance.

[0031] This alarm system is as attached Figure 1 As shown, it includes a gas filling port 1 connected to the automobile air pipe, a miniature pressure sensor 3 is installed on the outer side of the gas filling port 1, and anti-static measures are provided on the miniature pressure sensor 3. In this embodiment, the anti-static measure is to share the frame grounding wire with the natural gas supply system of the whole vehicle to reduce the risk of static electricity, so that the installed miniature pressure sensor 3 meets the explosion-proof level of the gas filling port 1, so as to reduce the possibility of static sparks, and effectively reduce the explosion risk caused by the installation of the miniature pressure sensor 3.

[0032] In this embodiment, the size of the micro pressure sensor 3 is 20*10mm. For example, a micro pressure sensor 3 with a special shape (with a curvature) of model L10CT-3 can be used to achieve monitoring accuracy while improving data transmission efficiency, realizing tiny and precise data measurement, and facilitating installation and fitting to avoid falling and obstruction. In this embodiment, the micro pressure sensor 3 is installed at a distance of 10-15mm from the end of the gas filling port 1, so that the micro pressure sensor 3 maintains a certain distance from the gas filling port, further reducing the dust that may be adsorbed from entering the gas filling port 1, and ensuring the sealing and safety of the gas filling port 1.

[0033] In this embodiment, as shown in the attached Figure 2 As shown, a convex surface 7 is provided on the surface of the gas filling port 1, and the micro pressure sensor is installed on the upper part of the convex surface 7. In this embodiment, the height of the convex surface 7 is set to 2-3 mm. It is ensured that the micro pressure sensor can sense the pressing force of the protective cap. If the convex surface is too small, it is difficult to ensure the accurate sensing of the pressure of the protective cap. If the convex surface is too large, it is difficult to ensure the convenient installation of the protective cap.

[0034] As attached Figure 1 As shown, a protective cap 2 is pressed onto the outside of the micro pressure sensor 3. In this embodiment, the protective cap 2 is a rubber protective cap, which is pressed onto the surface of the micro pressure sensor 3 and the gas filling port 1. A lifting ring 8 is provided at the lower end of the protective cap 2, and a connecting rope 6 is sleeved on the lifting ring 8. The other end of the connecting rope 6 is sleeved on the gas filling port 1 to prevent the protective cap 2 from being lost when it falls off, so that the problem of the protective cap 2 falling off can be dealt with in time.

[0035] In this embodiment, the micro pressure sensor 3 is electrically connected to the data processor 4 through wires, and the pressure value of the protective cap 2 is obtained through the micro pressure sensor 3, and the pressure value data is transmitted to the data processor 4. The data processor 4 is used to receive and process the signal of the micro pressure sensor 3, and judge whether the gas filling port protective cap 2 is intact by the presence or absence of pressure sensing. At the same time, the data processor 4 is electrically connected to the alarm 5. In this embodiment, the alarm 5 adopts an audible and visual alarm. The alarm 5 is installed on the vehicle instrument panel near the driver's position, so that the alarm information can be accurately and quickly conveyed to the relevant personnel, and when the protective cap 2 falls off, it can be discovered and quickly handled in time.

[0036] In this embodiment, the alarm system is provided with a 24V DC power supply by the vehicle, and the power supply is controlled by the vehicle ignition switch. When the vehicle ignition switch is turned off during gas filling, the protective cap 2 on the gas filling port will not cause an alarm.

[0037] Given the extremely flammable nature of compressed natural gas (CNG), any factor that can induce sparks, promote static electricity accumulation, or promote dust concentration may act as a trigger point that leads to an explosion. The gas port of a CNG vehicle, as the core link between the vehicle and the gas supply device, must be designed in strict compliance with safety standards to ensure effective prevention and control of explosion hazards. Therefore, the current gas port structure design tends to simplify the layout of components around it, reduce the use of electrical components and connection interfaces, so as to reduce the generation of static electricity caused by circuit components, prevent static electricity from accumulating to the critical point that can ignite CNG gas, and thus avoid electric sparks or explosion accidents. Based on this principle, structural elements that may increase safety risks are generally not used in the gas port area.

[0038] Therefore, with existing technical means, gas leaks at gas filling ports are often difficult to detect quickly. Even if relevant monitoring devices are deployed, these devices are usually deployed in other locations away from the gas filling ports and work by monitoring the gas concentration in a specific area. These devices will only trigger an alarm when the gas concentration in the area exceeds the preset safety threshold. However, if a gas leak occurs but the amount of leaked gas has not reached the concentration that triggers the alarm, the system will not be able to issue a warning in time. Although the current leakage may not be enough to directly cause a safety accident for the time being, it undoubtedly poses a safety hazard. Once encountering uncertain factors such as a fire source, it is possible to trigger a catastrophic explosion, with disastrous consequences.

[0039] Based on this, this solution breaks away from the traditional monitoring mode and does not rely on the monitoring of leaking gas, but instead focuses on the status of the protective cap at the gas filling port. By monitoring the pressure value of the protective cap, it is possible to instantly determine whether it has fallen off. Once it has fallen off, it can be dealt with quickly to fundamentally prevent the occurrence of gas leakage. In addition, this solution optimizes the design of the micro pressure sensor, minimizes the circuit connection structure, and has a simple and reliable structure. It also takes effective anti-static measures and shares the frame grounding wire with the gas supply system. This simplifies the structure while achieving the purpose of electrostatic protection, ensuring that the sensor can significantly reduce the risk of explosion after installation. This innovative method allows a micro pressure sensor to be installed directly at the gas filling port to monitor the protective cap, achieving early warning and timely handling of potential problems, effectively improving safety, and having high versatility.

[0040] Embodiment 2

[0041] This embodiment provides a CNG vehicle alarm method, which is applied to the CNG vehicle alarm system described above. Figure 3 As shown, the following steps are included:

[0042] S1, obtaining the current pressure value data of the protective cap 2 through a micro pressure sensor; and transmitting the pressure value data to the data processor 4.

[0043] In this embodiment, a 24V DC power supply is provided by the whole vehicle, and the power supply is controlled by the vehicle ignition switch. When the gas filling is completed, the monitoring is automatically started during driving to obtain the pressure value data of the protective cap 2 in real time, and the data is received and processed and analyzed by the data processor 4.

[0044] S2, judging the status information of the protective cap 2 and the gas filling port 1 according to the pressure value data.

[0045] According to the measurement, when the protective cap 2 is separated from the gas filling port 1, its pressure value data P is 0%, and when the protective cap 2 is completely covered on the gas filling port 1, its pressure value data P is 100%. Therefore, the pressure value data of the protective cap 2 is divided into 5 pressure levels, namely 0%, 0%<P≤30%, 30%<P≤70%, 70%<P<100%, 100%, and the corresponding state information is completely separated, about to be separated, possibly separated, loose and not separated.

[0046] According to the acquired pressure value data, the pressure level corresponding to the pressure value data of the current protective cap 2 can be determined, so that the installation status of the current protective cap 2 can be quickly obtained. Only when it is determined that it is not detached, the alarm 5 will not be triggered, while in other states, the alarm 5 will give an audible and visual alarm prompt, so that relevant personnel can discover it in time and take corresponding measures.

[0047] At the same time, in this embodiment, the current driving information of the vehicle is obtained through the vehicle control system, and the state information of the protective cap 2 is judged in combination with the driving information. The driving information includes the driving parameters and driving path information of the vehicle, and the current state information of the protective cap and the gas filling port is used to make a prejudgment and give a corresponding prompt.

[0048] Specifically, the vehicle driving parameters include the current vehicle driving speed, and the driving path information includes the driving path status obtained through the navigation system, and the driving path status is used to determine the turning degree, slope, road smoothness, etc. of the path, so as to determine the possible shaking effect of the current vehicle driving state on the protective cap 2.

[0049] In this embodiment, the shaking effect is divided into three levels, namely, large shaking effect, medium shaking effect and small shaking effect. According to the currently acquired state information of the protective cap 2, it is comprehensively judged whether the shaking effect will further accelerate the falling off of the protective cap 2.

[0050] If after comprehensive analysis, it is determined that the current pressure value data P of the protective cap 2 is within the range of 0%<P≤30%, and the jitter effect of the current road section is large, then it can be concluded that the protective cap 2 is likely to be detached after passing through the road section. At this time, the nearest parking area or road section area that can be repaired is searched according to the obtained navigation road section information. Then, a reminder is given in combination with the status information and the obtained parking area to facilitate quick processing and avoid safety hazards.

[0051] S3, issue an alarm prompt based on the status information.

[0052] According to the monitored pressure value data P, the current state information of the protective cap 2 is analyzed. When the pressure value data P is 0%, it means that the protective cap 2 has been detached. At this time, the alarm 5 sends out an audible and visual prompt and displays a detached mark.

[0053] When the pressure value data P>0%, the pressure value data P is divided according to the pressure level and comprehensively analyzed in combination with the driving path status. When the vehicle is about to be disengaged or about to be disengaged, an audible and visual prompt is issued, and a corresponding parking area indication point is given. This allows the driver to quickly handle the situation while ensuring safety, avoiding safety accidents and ensuring driving safety.

[0054] In this embodiment, a new CNG vehicle alarm device design is provided, which can timely and accurately detect abnormalities of the gas filling port protective cap and immediately alert the driver through the sound and light alarm, effectively reducing the occurrence of safety accidents caused by the missing gas filling port protective cap of CNG vehicles, improving the safety and competitiveness of my country's CNG vehicles, and having great economic and social benefits.

[0055] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A compressed natural gas vehicle alarm system, characterized in that: The invention comprises a gas filling port of an automobile, a micro pressure sensor is arranged on the outer side of the gas filling port, and anti-static measures are arranged on the micro pressure sensor; a protective cap is pressed on the outer sleeve of the micro pressure sensor; the micro pressure sensor is electrically connected to a data processor, and the data processor is electrically connected to an alarm, and the alarm is arranged on the vehicle instrument panel.

2. A CNG vehicle alarm system according to claim 1, characterized in that: The size of the micro pressure sensor is 20*10mm, and the anti-static measure is grounding through the frame grounding wire.

3. A CNG vehicle alarm system according to claim 1, characterized in that: The micro pressure sensor is arranged at a distance of 10-15 mm from the end of the gas filling port.

4. A CNG vehicle alarm system according to claim 1, characterized in that: A convex surface is arranged on the surface of the gas filling port, and the micro pressure sensor is arranged on the convex surface.

5. A CNG vehicle alarm system according to claim 4, characterized in that: The height of the raised surface is 2-3 mm.

6. A CNG vehicle alarm system according to claim 1, characterized in that: The protective cap is a rubber protective cap.

7. A compressed natural gas vehicle alarm method, characterized in that: A compressed natural gas vehicle alarm system applied to any one of claims 1 to 6, comprising the following steps: Step 1, obtaining the current pressure value data of the protective cap through a micro pressure sensor; transmitting the pressure value data to a data processor; Step 2, judging the status information of the protective cap and the gas filling port according to the pressure value data; Step 3: Issue an alarm based on the status information.

8. A CNG vehicle alarm method according to claim 7, characterized in that: The status information includes completely disengaged, about to be disengaged, possibly disengaged, loose, and not disengaged.

9. A CNG vehicle alarm method according to claim 7, characterized in that: In step 2, it also includes obtaining the current driving information of the vehicle and determining the state information of the protective cap according to the driving information.

10. A CNG vehicle alarm method according to claim 9, characterized in that: The driving information includes vehicle driving parameters and driving path information, and a prediction is made and a prompt is given according to the current status information of the protective cap and the gas filling port.

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