Automobile compressed natural gas fuel system and automobile

Abstract

The utility model discloses an automobile compressed natural gas fuel system and an automobile. According to the automobile compressed natural gas fuel system, an integrated pipe temperature sensor is arranged on the outer wall of a low-pressure integrated pipe; the heating equipment is arranged on the outer wall of the low-pressure integrated pipe, is positioned between the pressure reducer and the integrated pipe temperature sensor, and is connected with the temperature control switch; the temperature control switch is arranged on the outer wall of the low-voltage integrated pipe, one end is connected with the heating equipment, the other end is connected with the vehicle storage battery, and the temperature control switch is located between the heating equipment and the engine. The temperature control switch is arranged between the heating equipment and the engine, whether the temperature of the natural gas heated by the heating equipment exceeds the safety threshold value or not can be sensed, if the temperature exceeds the safety threshold value, the temperature control switch cuts off the power supply of the vehicle storage battery to the heating equipment, so that the heating equipment stops heating, and the heating safety can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile fuel systems, and more specifically, to an automobile compressed natural gas fuel system and an automobile. Background Art

[0002] As a clean energy source, natural gas produces fewer pollutants during the combustion process. If natural gas is used as the fuel for an automobile, it can effectively reduce automobile exhaust emissions. Therefore, natural gas vehicles have emerged as the times require. However, if a natural gas vehicle only uses natural gas as the fuel, there are drawbacks. There will be problems such as poor starting, long starting time or inability to start in a low-temperature environment. Therefore, in the prior art, automobiles using natural gas as the fuel usually also have a fuel system. The fuel system is used to provide fuel to start the engine under low-temperature conditions, and then the waste heat of the engine is introduced into the natural gas pressure reducer through a water pipe. After the waste heat of the engine heats the natural gas to an appropriate temperature, the fuel used by the engine is converted to natural gas.

[0003] In order to avoid the complexity of the structure and the increase in cost of natural gas vehicles caused by adding a fuel system, improving the natural gas fuel system of natural gas vehicles has become the research goal.

[0004] In the prior art, the utility model patent with the authorization announcement number CN 210509429 U has provided a gas pipe for a natural gas engine, which discloses that "when the gas enters the pipe body 4 of the gas pipe in winter or a low-temperature environment, the intake temperature sensor 3 installed on the gas pipe intake joint 1 and the ambient temperature sensor installed on the engine will transmit the measured values to the engine ECU. The engine ECU judges whether the gas temperature and the ambient temperature entering the pipe body 4 of the gas pipe are lower than the set value according to the previously calibrated preset temperature limit. When the ambient temperature and the gas temperature entering the pipe body 4 of the gas pipe are lower than the set value, the engine ECU will issue an instruction to make the silica gel heater 2 start working to heat the pipe body 4 of the gas pipe. When the gas temperature entering the pipe body 4 of the gas pipe is higher than the preset limit value, that is, when the outlet temperature sensor 6 installed on the gas pipe outlet joint 5 measures that the outlet temperature is greater than the preset limit value, the heating is stopped", by setting the intake temperature sensor and the ambient temperature sensor to obtain the external environment state, and when the external environment state is a low-temperature environment, controlling the heating device to raise the temperature of the natural gas to solve the problem that it is difficult for the vehicle to start in a low-temperature environment. However, with this structure, if the engine ECU or the outlet temperature sensor fails, the heating device cannot be stopped in time, which will cause the natural gas heating temperature to be too high and there is a safety hazard.

[0005] Therefore, providing a safer automobile compressed natural gas fuel system and an automobile is an urgent problem to be solved. Summary of the Utility Model

[0006] In view of this, the present utility model provides a compressed natural gas fuel system for a vehicle and a vehicle, so as to achieve more reliable and safer heating of natural gas.

[0007] On the one hand, the present utility model provides a compressed natural gas fuel system for a vehicle, including a compressed natural gas unit, a high-pressure integrated pipe, a pressure reducer, a low-pressure integrated pipe and an engine connected in sequence, and further including: an integrated pipe temperature sensor, a heating device and a temperature control switch, wherein,

[0008] The integrated pipe temperature sensor is arranged on the outer wall of the low-pressure integrated pipe, and the integrated pipe temperature sensor is connected to the vehicle battery;

[0009] The heating device is arranged on the outer wall of the low-pressure integrated pipe. Along the extension direction of the low-pressure integrated pipe, the heating device is located between the pressure reducer and the integrated pipe temperature sensor, and the heating device is connected to the temperature control switch;

[0010] The temperature control switch is arranged on the outer wall of the low-pressure integrated pipe, one end is connected to the heating device, the other end is connected to the vehicle battery, and along the extension direction of the low-pressure integrated pipe, the temperature control switch is located between the heating device and the engine.

[0011] Optionally, the heating device includes a heating coil, and the heating coil is spirally wound on the outer wall of the low-pressure integrated pipe.

[0012] Optionally, it further includes an auxiliary heating device, the auxiliary heating device is arranged on the outer wall of the high-pressure integrated pipe, and the auxiliary heating device is connected to the temperature control switch.

[0013] Optionally, along the extension direction of the high-pressure integrated pipe, the maximum distance from the auxiliary heating device to the pressure reducer is less than or equal to 500 millimeters.

[0014] Optionally, it further includes a fault warning device, the fault warning device is connected to the vehicle battery, and the fault warning device is a display screen, a lamp or a sound alarm.

[0015] Optionally, the heating device, the integrated pipe temperature sensor and the fault warning device are all provided with communication interfaces.

[0016] Optionally, it further includes an ambient temperature sensor, the ambient temperature sensor is connected to the vehicle battery, and has a gap with both the pressure reducer and the low-pressure integrated pipe.

[0017] Optionally, along the extension direction of the low-pressure integrated pipe, the ratio range of the length of the heating device to the length of the low-pressure integrated pipe is 0.3 to 1.

[0018] Optionally, along the extending direction of the low-pressure integrated pipe, the length range of the heating device is from 300 millimeters to 500 millimeters.

[0019] On the other hand, the present invention also provides an automobile, including a fuel system, and the fuel system adopts the compressed natural gas fuel system for automobiles described in any one of the above.

[0020] Compared with the prior art, the compressed natural gas fuel system for automobiles and the automobile provided by the present invention at least achieve the following beneficial effects:

[0021] The present invention provides a compressed natural gas fuel system for automobiles and an automobile, including a compressed natural gas unit, a high-pressure integrated pipe, a pressure reducer, a low-pressure integrated pipe and an engine which are connected in sequence, and further including: an integrated pipe temperature sensor, a heating device and a temperature control switch. Among them, the integrated pipe temperature sensor is arranged on the outer wall of the low-pressure integrated pipe and is connected to the vehicle battery; the heating device is arranged on the outer wall of the low-pressure integrated pipe. Along the extending direction of the low-pressure integrated pipe, the heating device is located between the pressure reducer and the integrated pipe temperature sensor, and the heating device is connected to the temperature control switch; the temperature control switch is arranged on the outer wall of the low-pressure integrated pipe, one end is connected to the heating device, and the other end is connected to the vehicle battery. Along the extending direction of the low-pressure integrated pipe, the temperature control switch is located between the heating device and the engine. By arranging the temperature control switch between the heating device and the engine, it can sense whether the temperature of the natural gas heated by the heating device exceeds the safety threshold. If it exceeds the safety threshold, the temperature control switch cuts off the power supply of the vehicle battery to the heating device, so that the heating device stops heating, which can effectively improve the heating safety.

[0022] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned technical effects.

[0023] Through the following detailed description of the exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear. Description of the Drawings

[0024] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention.

[0025] Figure 1 is a schematic structural diagram of a compressed natural gas fuel system for automobiles provided by the present invention;

[0026] Figure 2 is another schematic structural diagram of a compressed natural gas fuel system for automobiles provided by the present invention;

[0027] Figure 3It is a schematic structural diagram of an automobile provided by the present utility model.

[0028] In the figure: 1, compressed natural gas unit; 2, high-pressure integrated pipe; 3, pressure reducing pipe; 4, low-pressure integrated pipe; 5, engine; 6, integrated pipe temperature sensor; 7, vehicle battery; 8, heating device; 9, temperature control switch; 10, auxiliary heating device; 11, fault warning device; 12, ambient temperature sensor; 13, micro control unit; 000, automobile compressed natural gas fuel system; 100, automobile. Detailed implementation manners

[0029] Now, various exemplary embodiments of the present utility model will be described in detail with reference to the accompanying drawings. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present utility model.

[0030] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as a limitation to the present utility model and its application or use.

[0031] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the description.

[0032] In all the examples shown and discussed here, any specific values should be construed as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] Embodiment 1

[0035] Combined with Figure 1 , Figure 1 is a schematic structural diagram of an automobile compressed natural gas fuel system provided by the present utility model, to illustrate a specific embodiment of the automobile compressed natural gas fuel system 000 provided by the present utility model, including a compressed natural gas unit 1, a high-pressure integrated pipe 2, a pressure reducer 3, a low-pressure integrated pipe 4 and an engine 5 that are connected in sequence, and further including: an integrated pipe temperature sensor 6, a heating device 8 and a temperature control switch 9, wherein the integrated pipe temperature sensor 6 is arranged on the outer wall of the low-pressure integrated pipe 4, and the integrated pipe temperature sensor 6 is connected to the vehicle battery 7;

[0036] The heating device 8 is arranged on the outer wall of the low-pressure integrated pipe 4. Along the extending direction of the low-pressure integrated pipe 4, the heating device 8 is located between the pressure reducer 3 and the integrated pipe temperature sensor 6. The heating device 8 is connected to the temperature control switch 9.

[0037] The temperature control switch 9 is arranged on the outer wall of the low-pressure integrated pipe 4. One end is connected to the heating device 8, and the other end is connected to the vehicle battery 7. Along the extending direction of the low-pressure integrated pipe 4, the temperature control switch 9 is located between the heating device 8 and the engine 5.

[0038] It can be understood that when the integrated pipe temperature sensor 6 collects that the temperature of the low-pressure integrated pipe 4 is lower than the preset minimum temperature, the heating device 8 can be controlled to heat the low-pressure integrated pipe 4, so as to heat the natural gas in the low-pressure integrated pipe 4, and further avoid the influence of too low ambient temperature on the use of natural gas. Under normal circumstances, the temperature of the low-pressure integrated pipe 4 can be obtained in real time through the integrated pipe temperature sensor 6. When the temperature of the low-pressure integrated pipe 4 reaches the preset minimum temperature, the heating device 8 is controlled to stop heating. If the integrated pipe temperature sensor 6 fails, it is impossible to correctly judge whether the temperature of the low-pressure integrated pipe 4 reaches the preset minimum temperature, resulting in continuous heating of the heating device 8. By arranging the temperature control switch 9 between the heating device 8 and the engine 5, it can sense whether the temperature of the natural gas heated by the heating device 8 exceeds the safety threshold. If it exceeds the safety threshold, the temperature control switch 9 automatically cuts off the power supply of the vehicle battery 7 to the heating device 8, so that the heating device 8 stops heating, which can effectively improve the heating safety.

[0039] Embodiment 2

[0040] Combined with Figure 2 , Figure 2 which is another structural schematic diagram of the vehicle compressed natural gas fuel system provided by the present invention, to illustrate another specific embodiment of the vehicle compressed natural gas fuel system 000 provided by the present invention, including a compressed natural gas unit 1, a high-pressure integrated pipe 2, a pressure reducer 3, a low-pressure integrated pipe 4 and an engine 5 that are connected in sequence, and further including: an integrated pipe temperature sensor 6, a heating device 8, a temperature control switch 9, an auxiliary heating device 10, a fault warning device 11 and an ambient temperature sensor 12. Among them,

[0041] The integrated pipe temperature sensor 6 is arranged on the outer wall of the low-pressure integrated pipe 4. The integrated pipe temperature sensor 6 is connected to the vehicle battery 7.

[0042] The heating device 8 is arranged on the outer wall of the low-pressure integrated pipe 4. Along the extending direction of the low-pressure integrated pipe 4, the heating device 8 is located between the pressure reducer 3 and the integrated pipe temperature sensor 6. The heating device 8 is connected to the temperature control switch 9. The heating device 8 includes a heating coil, and the heating coil is spirally wound on the outer wall of the low-pressure integrated pipe 4.

[0043] The temperature control switch 9 is arranged on the outer wall of the low-pressure integrated pipe 4, one end is connected to the heating device 8, and the other end is connected to the vehicle battery 7. Along the extending direction of the low-pressure integrated pipe 4, the temperature control switch 9 is located between the heating device 8 and the engine 5;

[0044] The auxiliary heating device 10 is arranged on the outer wall of the high-pressure integrated pipe 2, and the auxiliary heating device 10 is connected to the temperature control switch 9;

[0045] The fault warning device 11 is connected to the vehicle battery 7, and the fault warning device 11 is a display screen, a lamp or a sound alarm;

[0046] The ambient temperature sensor 12 is connected to the vehicle battery 7, and there are intervals between the ambient temperature sensor 12 and the pressure reducer 3 and the low-pressure integrated pipe 4;

[0047] The heating device 8, the integrated pipe temperature sensor 6, the fault warning device 11 and the ambient temperature sensor 12 are all provided with communication interfaces.

[0048] It should be noted that in Figure 2 only the heating device 8 and the auxiliary heating device 10 are shown to be heated by spiral coils. Of course, it is not limited to this. It can be set that only the heating device 8 is heated by a spiral coil, or only the auxiliary heating device 10 is heated by a spiral coil, and it is not limited to this. The auxiliary heating device 10 and the heating device 8 are both connected to the temperature control switch 9. When the temperature of the low-pressure integrated pipe 4 exceeds the safety threshold, the temperature control switch 9 can stop the heating of both the auxiliary heating device 10 and the heating device 8 at the same time, ensuring safety. In Figure 2 it is also shown that the vehicle battery 7 is connected to the fault warning device 11 and the ambient temperature sensor 12. Of course, it is not limited to this. The devices connected to the vehicle battery 7 can be set according to actual needs, and this embodiment does not make specific limitations on this. Since the pressure reducer 3 absorbs heat during the process of decompressing the high-pressure compressed natural gas, the temperature of the low-pressure integrated pipe 4 will drop. The ambient temperature sensor 12 is arranged at intervals from the pressure reducer 3 and the low-pressure integrated pipe 4, which can effectively avoid the influence of the pressure reducer 3 and the low-pressure integrated pipe 4 on the acquisition result of the ambient temperature sensor 12.

[0049] It can be understood that with reference to Figure 2, the heating device 8, the integrated tube temperature sensor 6, the fault warning device 11, and the ambient temperature sensor 12 are all provided with communication interfaces. It can be set that the micro control unit 13 is connected to the heating device 8, the integrated tube temperature sensor 6, the fault warning device 11, and the ambient temperature sensor 12 through the communication interfaces. The micro control unit 13 can be an MCU chip. Of course, it is not limited to this. When the vehicle is powered on, the micro control unit 13 collects the signal of the ambient temperature sensor 12 and judges whether the signal of the ambient temperature sensor 12 is less than the preset minimum temperature; if it is less than the preset minimum temperature, the micro control unit 13 controls the heating device 8 and / or the auxiliary heating device 10 to heat for a preset time period; after the preset time period, the micro control unit 13 collects the signal of the integrated tube temperature sensor 6 and judges whether the signal of the integrated tube temperature sensor 6 is greater than or equal to the preset minimum temperature; if it is greater than or equal to the preset minimum temperature, the micro control unit 13 issues a signal to allow the vehicle to start; if it is less than the preset minimum temperature, the micro control unit 13 issues a signal not to allow the vehicle to start and sends a signal to the fault warning device 11 to give an alarm through the fault warning device 11. Specifically, the micro control unit 13 can be connected to the engine management unit (EMS), the engine management unit is connected to the engine 5, and the micro control unit 13 sends a signal to allow the vehicle to start or a signal not to allow the vehicle to start to the engine management unit, so as to realize the control of the engine 5. Of course, it is not limited to this. During the heating process, if the integrated tube temperature sensor 6 or the micro control unit 13 fails, resulting in the temperature of the integrated tube temperature sensor 6 exceeding the safety threshold, the temperature control switch 9 automatically cuts off the power supply of the vehicle battery 7 to the heating device 8, so that the heating device 8 and / or the auxiliary heating device 10 stop heating, which can effectively improve the heating safety.

[0050] Embodiment 3

[0051] Continue to refer to Figure 2 , to illustrate another embodiment of the automotive compressed natural gas fuel system 000 provided by the present invention, which includes a compressed natural gas unit 1, a high-pressure integrated tube 2, a pressure reducer 3, a low-pressure integrated tube 4, and an engine 5 that are connected in sequence, and further includes: an integrated tube temperature sensor 6, a heating device 8, a temperature control switch 9, an auxiliary heating device 10, a fault warning device 11, and an ambient temperature sensor 12, wherein,

[0052] The integrated tube temperature sensor 6 is arranged on the outer wall of the low-pressure integrated tube 4, and the integrated tube temperature sensor 6 is connected to the vehicle battery 7;

[0053] The heating device 8 is arranged on the outer wall of the low-pressure integrated tube 4. Along the extension direction of the low-pressure integrated tube 4, the heating device 8 is located between the pressure reducer 3 and the integrated tube temperature sensor 6. The heating device 8 is connected to the temperature control switch 9. The heating device 8 includes a heating coil, and the heating coil is spirally wound around the outer wall of the low-pressure integrated tube 4;

[0054] The temperature control switch 9 is arranged on the outer wall of the low-pressure integrated pipe 4, one end is connected to the heating device 8, and the other end is connected to the vehicle battery 7. Along the extension direction of the low-pressure integrated pipe 4, the temperature control switch 9 is located between the heating device 8 and the engine 5;

[0055] The auxiliary heating device 10 is arranged on the outer wall of the high-pressure integrated pipe 2. The auxiliary heating device 10 is connected to the temperature control switch 9. Along the extension direction of the high-pressure integrated pipe 2, the maximum distance from the auxiliary heating device 10 to the pressure reducer 3 is less than or equal to 500 millimeters;

[0056] The fault warning device 11 is connected to the vehicle battery 7. The fault warning device 11 is a display screen, a lamp or a sound alarm. The heating device 8, the integrated pipe temperature sensor 6 and the fault warning device 11 are all provided with communication interfaces.

[0057] The ambient temperature sensor 12 is connected to the vehicle battery 7 and has a gap with the pressure reducer 3 and the low-pressure integrated pipe 4.

[0058] Along the extension direction of the low-pressure integrated pipe 4, the ratio range of the length of the heating device 8 to the length of the low-pressure integrated pipe 4 is 0.3 to 1.

[0059] Along the extension direction of the low-pressure integrated pipe 4, the length range of the heating device 8 is 300 millimeters to 500 millimeters.

[0060] It should be noted that in this embodiment, taking the length of the heating device 8 as 300 millimeters and the length of the low-pressure integrated pipe 4 as 500 millimeters along the extension direction of the low-pressure integrated pipe 4 as an example, of course, it is not limited to this, and it can be adjusted according to the actual situation, as long as it can meet the requirement of raising the temperature of the low-pressure integrated pipe 4 equal to or slightly higher than the preset minimum temperature within the preset time period. This embodiment does not make specific restrictions on this. Since the pressure reducer 3 absorbs heat when decompressing high-pressure compressed natural gas, the maximum distance from the auxiliary heating device 10 to the pressure reducer 3 is set to be less than or equal to 500 millimeters, that is, the auxiliary heating device 10 is arranged close to the heat absorption position of the pressure reducer 3, so as to reduce heat loss and effectively improve the heating efficiency.

[0061] It can be understood that in this embodiment, the preset minimum temperature is -15°C and the preset time period is 5 seconds. When the vehicle is powered on, the microcontroller unit 13 collects the signal of the ambient temperature sensor 12 and determines whether the signal of the ambient temperature sensor 12 is less than -15°C; if it is less than -15°C, the microcontroller unit 13 controls the heating device 8 to heat for 5 seconds, or the auxiliary heating device 10 to heat for 5 seconds, or the heating device 8 and the auxiliary heating device 10 to heat simultaneously for 5 seconds, or the heating device 8 to heat for 5 seconds and the auxiliary heating device 10 to heat for 2 seconds. Of course, it is not limited to this and can be set according to actual needs. After 5 seconds, the microcontroller unit 13 collects the signal of the integrated pipe temperature sensor 6 and determines whether the signal of the integrated pipe temperature sensor 6 is greater than or equal to -15°C; if it is greater than or equal to -15°C, the microcontroller unit 13 issues a signal allowing the vehicle to start; if it is less than -15°C, the microcontroller unit 13 issues a signal not allowing the vehicle to start and sends a signal to the fault warning device 11, and the fault warning device 11 is a display screen that displays the fault information. During the heating process, if the integrated pipe temperature sensor 6 or the microcontroller unit 13 fails, resulting in the temperature of the integrated pipe temperature sensor 6 exceeding the safety threshold, the temperature control switch 9 automatically cuts off the power supply of the vehicle battery 7 to the heating device 8, so that the heating device 8 and / or the auxiliary heating device 10 stops heating, which can effectively improve the heating safety.

[0062] Embodiment 4

[0063] Based on the same idea, referring to Figure 3 , Figure 3 FIG. is a schematic structural diagram of a vehicle provided by the present invention. The present invention also provides a vehicle 100, including a fuel system, and the fuel system adopts the vehicle compressed natural gas fuel system 000 of any one of the above embodiments.

[0064] It can be understood that the vehicle 100 provided by the present invention adopts the vehicle compressed natural gas fuel system 000, which can rapidly increase the temperature of natural gas in a low-temperature environment, effectively solve problems such as difficult starting of the engine by natural gas in a low-temperature environment, enable the vehicle 100 to not require an additional fuel system, simplify the structure of the vehicle 100, reduce costs, and have high safety.

[0065] Through the above embodiments, it can be seen that the vehicle compressed natural gas fuel system and the vehicle provided by the present invention have at least achieved the following beneficial effects:

[0066] The utility model provides an automotive compressed natural gas fuel system and an automobile, which includes a compressed natural gas unit, a high-pressure integrated pipe, a pressure reducer, a low-pressure integrated pipe and an engine that are connected in sequence, and further includes: an integrated pipe temperature sensor, a heating device and a temperature control switch. Among them, the integrated pipe temperature sensor is arranged on the outer wall of the low-pressure integrated pipe and is connected to the vehicle battery; the heating device is arranged on the outer wall of the low-pressure integrated pipe, and along the extending direction of the low-pressure integrated pipe, the heating device is located between the pressure reducer and the integrated pipe temperature sensor, and the heating device is connected to the temperature control switch; the temperature control switch is arranged on the outer wall of the low-pressure integrated pipe, one end is connected to the heating device, and the other end is connected to the vehicle battery. Along the extending direction of the low-pressure integrated pipe, the temperature control switch is located between the heating device and the engine. By arranging the temperature control switch between the heating device and the engine, it can sense whether the temperature of the natural gas heated by the heating device exceeds the safety threshold. If it exceeds the safety threshold, the temperature control switch cuts off the power supply of the vehicle battery to the heating device, so that the heating device stops heating, which can effectively improve the heating safety.

[0067] There is a relationship of mutual cooperation and functional support among the technical features of the utility model, that is, the technical solution is not a "simple superposition" of the technical features between multiple comparative documents. Therefore, the utility model does not fall into the situation of "simple superposition" in Chapter 4, Part II of the "Patent Examination Guidelines".

[0068] Although some specific embodiments of the utility model have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the utility model. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.

Claims

1. A compressed natural gas fuel system for an automobile, comprising a compressed natural gas unit, a high-pressure integrated pipe, a pressure reducer, a low-pressure integrated pipe and an engine connected in sequence, characterized in that: Also includes: Integrated tube temperature sensor, heating equipment and temperature control switch, among which, The integrated tube temperature sensor is arranged on the outer wall of the low-pressure integrated tube, and the integrated tube temperature sensor is connected to the vehicle battery; The heating device is arranged on the outer wall of the low-pressure integrated pipe, and along the extension direction of the low-pressure integrated pipe, the heating device is located between the pressure reducer and the integrated pipe temperature sensor, and the heating device is connected to the temperature control switch; The temperature control switch is arranged on the outer wall of the low-pressure integrated tube, one end of which is connected to the heating device and the other end is connected to the vehicle battery. Along the extension direction of the low-pressure integrated tube, the temperature control switch is located between the heating device and the engine.

2. The automobile compressed natural gas fuel system according to claim 1, characterized in that: The heating device comprises a heating coil, and the heating coil is spirally wound around the outer wall of the low-pressure integrated pipe.

3. The automobile compressed natural gas fuel system according to claim 1, characterized in that: It also includes an auxiliary heating device, which is arranged on the outer wall of the high-pressure integrated pipe and is connected to the temperature control switch.

4. The automobile compressed natural gas fuel system according to claim 3, characterized in that: Along the extension direction of the high-pressure integrated pipe, the maximum distance from the auxiliary heating device to the pressure reducer is less than or equal to 500 mm.

5. The automobile compressed natural gas fuel system according to claim 1, characterized in that: It also includes a fault warning device, which is connected to the vehicle battery and is a display screen, a light or a sound alarm.

6. The automobile compressed natural gas fuel system according to claim 5, characterized in that: The heating device, the integrated tube temperature sensor and the fault warning device are all provided with communication interfaces.

7. The automobile compressed natural gas fuel system according to claim 1, characterized in that: It also includes an ambient temperature sensor, which is connected to the vehicle battery and is spaced apart from the pressure reducer and the low-pressure integrated pipe.

8. The automobile compressed natural gas fuel system according to claim 2, characterized in that: Along the extension direction of the low-pressure integrated pipe, the ratio of the length of the heating device to the length of the low-pressure integrated pipe ranges from 0.3 to 1.

9. The automobile compressed natural gas fuel system according to claim 2, characterized in that: Along the extension direction of the low-pressure integrated pipe, the length of the heating device ranges from 300 mm to 500 mm.

10. An automobile, characterized in that: It comprises a fuel system, and the fuel system adopts the automobile compressed natural gas fuel system according to any one of claims 1-9.

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