Fuel system of motor vehicle

Abstract

The utility model provides a motor vehicle fuel oil system, and belongs to the technical field of motor vehicle fuel oil system structures. The motor vehicle fuel system is communicated with a fuel pump and a fuel injector component through a first fuel pipe; the second fuel pipe is communicated with the fuel injector component and the fuel tank, and the pressure release valve is mounted on the second fuel pipe, so that the problem that the fuel pipe is gasified under the influence of temperature to generate air resistance, and ignition of an engine is difficult is solved. The system comprises a fuel tank, a fuel pump, a fuel injector component and an engine, the fuel pump and the fuel injector component are connected through a fuel pipe component, the fuel pump pumps fuel in the fuel tank into the fuel injector component, the fuel enters an air cylinder of the engine under the action of the fuel injector component, and the fuel pipe component comprises a first fuel pipe and a second fuel pipe; the first fuel pipe is communicated with the fuel pump and the fuel injector component; the second fuel pipe is communicated with the fuel injector component and the fuel tank, and a pressure release valve is installed on the second fuel pipe.

Description

Technical Field

[0001] The utility model belongs to the technical field of the fuel system structure of motor vehicles, and particularly relates to a fuel system for motor vehicles. Background Art

[0002] The fuel system of a motor vehicle consists of multiple components such as a fuel tank, a fuel pump, an injector, and a fuel filter, which work together to ensure that the engine can obtain the required fuel flow under various operating conditions. Among them, the fuel tank is used to store fuel; the fuel pump is responsible for sucking fuel out of the fuel tank, filtering out impurities through the fuel filter, and sending it to each injector through pipelines and a fuel rail. Then, through the action of the injector nozzle, the fuel is sprayed into the cylinder of the engine at high pressure and forms a mixture with the air in the cylinder.

[0003] After the high-pressure fuel is sprayed into the cylinder and forms a mixture with the air, the ignition system, that is, the spark plug generates a spark in the cylinder, ignites the mixture in the cylinder, generates an explosive force to push the piston downward, drives the crankshaft to rotate, and thus generates power.

[0004] After a motor vehicle has been running for a long time, it stops and the engine is turned off. The heat inside the engine diffuses outward. This part of the heat will cause the fuel in the fuel pipe connecting the fuel tank and the injector to vaporize and generate bubbles, that is, gas blockage occurs, which increases the air pressure in the fuel pipe. As a result, after a short stop, when the driver wants to restart the engine, it is difficult to ignite. Summary of the Utility Model

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a fuel system for motor vehicles, which is used to solve the problem that after a motor vehicle has been running for a long time and then stops briefly and restarts the engine, the engine is difficult to ignite due to the gas blockage generated by the vaporization of the fuel in the fuel pipe affected by temperature.

[0006] To achieve the above purpose and other related purposes, the present utility model provides a fuel system for motor vehicles, including a fuel tank, a fuel pump, an injector component, and an engine. The fuel pump and the injector component are connected through a fuel pipe component. The fuel pump pumps the fuel in the fuel tank into the injector component, and the fuel enters the cylinder of the engine through the action of the injector component. The fuel pipe component includes a first fuel pipe and a second fuel pipe; the first fuel pipe connects the fuel pump and the injector component; the second fuel pipe connects the injector component and the fuel tank, and a pressure relief valve is installed on the second fuel pipe.

[0007] Optionally, the engine is a twin-cylinder engine, and the twin-cylinder engine includes a first cylinder and a second cylinder.

[0008] Optionally, the fuel injector component includes a first fuel injector and a second fuel injector. The first fuel injector communicates with the first cylinder, and the second fuel injector communicates with the second cylinder. The first fuel pipe sequentially communicates with the fuel pump, the first fuel injector, and the second fuel injector. The second fuel pipe communicates with the second fuel injector and the fuel tank.

[0009] Optionally, it further includes a fuel filter, and the fuel filter is installed on the fuel pump.

[0010] Optionally, the fuel injector component is a flapper valve type fuel injector.

[0011] Optionally, the fuel injector component is a multi-hole fuel injector.

[0012] Optionally, it further includes an oil pressure regulator, and the oil pressure regulator is installed at the outlet of the fuel pump.

[0013] Optionally, it further includes an oil pressure pulsation damper, and the oil pressure pulsation damper is directly connected to the fuel pipe component.

[0014] Optionally, a cold start switch is also installed on the fuel injector component.

[0015] As described above, a fuel system for a motor vehicle according to the present invention has at least the following beneficial effects:

[0016] 1. In this fuel system for a motor vehicle, the fuel pump and the fuel injector component are connected through the first fuel pipe; the fuel injector component and the fuel tank are connected through the second fuel pipe, and a pressure relief valve is installed on the second fuel pipe. After the motor vehicle has been driven for a long time and the driver stops the vehicle and shuts off the engine, even if the heat emitted by the engine causes the fuel in the fuel pipe component to vaporize and the air pressure increases to generate vapor lock, due to the setting of the pressure relief valve, when the oil pressure in the fuel pipe component reaches the set value of the pressure relief valve, the pressure relief valve opens, and the oil and gas in the fuel pipe component flow back to the fuel tank through the second fuel pipe, thus solving the problem that the fuel pipe is affected by temperature and vaporizes to generate vapor lock, resulting in difficult engine ignition. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It shows a schematic diagram of a fuel system for a motor vehicle according to the present invention.

[0018] Figure 2 It shows a schematic diagram of a prior art fuel system.

[0019] DESCRIPTION OF REFERENCE NUMERALS

[0020] Fuel tank 1, fuel pump 2, left section of the first fuel pipe 3, right section of the first fuel pipe 4, left section of the second fuel pipe 5, right section of the second fuel pipe 6, pressure relief valve 7, first fuel injector 8, second fuel injector 9. Detailed implementation mode

[0021] The following specific embodiments illustrate the implementation mode of the present utility model. Those skilled in this technology can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0022] Please refer to Figures 1 to 2 Note that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present utility model. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear narration, and are not used to limit the scope for the implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change of the technical content, should also be regarded as the scope for the implementation of the present utility model.

[0023] The following various embodiments are only for illustration. Combinations can be made between the various embodiments, and it is not limited to the content shown in the following single embodiment only.

[0024] Please refer to Figure 1 and Figure 2 The present utility model provides a fuel system for a motor vehicle. Just like a common fuel system, it includes a fuel tank 1, a fuel pump 2, an injector component and an engine. The difference from the existing fuel system lies in the connection relationship between the components, that is, the fuel pump 2 and the injector component are connected through a fuel pipe component. The fuel pump 2 pumps the fuel in the fuel tank 1 into the injector component. The fuel acts through the injector component and enters the cylinder of the engine. The fuel pipe component includes a first fuel pipe and a second fuel pipe. The first fuel pipe connects the fuel pump 2 and the injector component. The second fuel pipe connects the injector component and the fuel tank 1. A pressure relief valve 7 is installed on the second fuel pipe. After the motor vehicle has been driven for a long time and the driver parks the vehicle and shuts down the engine, even if the heat emitted by the engine causes the fuel in the fuel pipe component to vaporize and the air pressure increases to produce air blockage, due to the setting of the pressure relief valve 7, when the oil pressure in the fuel pipe component reaches the set value of the pressure relief valve 7, the pressure relief valve 7 opens, and the oil and gas in the fuel pipe component flow back to the fuel tank 1 through the second fuel pipe, thus solving the problem that the fuel pipe is vaporized by temperature and produces air blockage, resulting in difficult ignition of the engine.

[0025] In another implementation mode, please refer to Figure 1, the engine is a twin-cylinder engine. The twin-cylinder engine includes a first cylinder and a second cylinder. The two cylinders are arranged on a body and share a single crankshaft to output power. Compared with a single-cylinder engine, the twin-cylinder engine has better smoothness, lower vibration and noise.

[0026] In another embodiment, please refer to Figure 1 , in order to enable the fuel system of this motor vehicle to adapt to the twin-cylinder engine, the injector components of this system include a first injector 8 and a second injector 9. The first injector 8 is connected to the first cylinder, and the second injector 9 is connected to the second cylinder; the first fuel pipe is sequentially connected to the fuel pump 2, the first injector 8 and the second injector 9, and the second fuel pipe is connected to the second injector 9 and the fuel tank 1.

[0027] As Figure 1 shown, the more detailed structure of the fuel pipe components is that the first fuel pipe is divided into a left section 3 of the first fuel pipe and a right section 4 of the first fuel pipe, and the second fuel pipe is divided into a left section 5 of the second fuel pipe and a right section 6 of the second fuel pipe; the left section 3 of the first fuel pipe is connected to the fuel pump 2 and the first injector 8, the right section 4 of the first fuel pipe is connected to the left section 3 of the first fuel pipe and the second injector 9, the left section 5 of the second fuel pipe is connected to the second injector 9 and the pressure relief valve 7, and the right section 6 of the second fuel pipe is connected to the pressure relief valve 7 and the fuel tank 1; both the first injector 8 and the second injector 9 can be installed with a three-way structural member to achieve the connection relationship here.

[0028] In another embodiment, please refer to Figure 1 , the pressure relief valve 7 sets the pressure relief value according to the external environment and the specific performance of the vehicle. This pressure relief value should not only avoid the problem that the engine cannot ignite due to air resistance in the fuel pipe components, but also prevent the pressure relief valve 7 from opening during the normal operation of the engine, resulting in insufficient gas supply to the engine cylinders.

[0029] In another embodiment, please refer to Figure 1 , it also includes a fuel filter. The fuel filter is installed on the fuel pump 2. The fuel filter is used to filter impurities in gasoline, ensure that the fuel supplied to the engine for combustion is purer, reduce mechanical wear, and improve reliability.

[0030] In another embodiment, the injector component is a flapper valve injector. The valve plate of the injector opens under the pressure of fuel gas, and fuel sprays out from the gap between the valve plate and the valve seat, having a relatively fast response speed and high injection accuracy.

[0031] In another embodiment, the injector component is a multi-hole injector. The injector can form a more uniform oil mist and improve the combustion efficiency.

[0032] In another embodiment, please refer to Figure 1 , and it further includes an oil pressure regulator which is installed at the outlet of the fuel pump 2 to ensure that the pressure difference between the pressure of the fuel supply system and the intake pipe (i.e., the injection pressure) remains stable, so as to achieve the precise control of the fuel injection quantity by the electronic control unit.

[0033] In another embodiment, it further includes an oil pressure pulsation damper which is directly connected to the fuel pipe component to reduce the pulsation and pulsation noise of the oil pressure in the fuel pipeline, maintain a certain pressure in the oil circuit, and facilitate the restart of the engine.

[0034] In other embodiments, a cold start switch is further installed on the injector component. When the engine starts at a low temperature, a certain amount of additional gasoline is injected into the intake pipe to enrich the air-fuel mixture and help the engine start quickly.

[0035] In summary, the utility model connects the fuel pump 2 and the injector component through the first fuel pipe; the second fuel pipe connects the injector component and the fuel tank 1, and there is a design of installing a pressure relief valve 7 on the second fuel pipe. After the motor vehicle has been driving for a long time and the driver parks the vehicle and shuts off the engine, even if the heat emitted by the engine vaporizes the fuel in the fuel pipe component and the air pressure rises to generate air resistance, due to the setting of the pressure relief valve 7, when the oil pressure in the fuel pipe component reaches the set value of the pressure relief valve 7, the pressure relief valve 7 opens, and the oil and gas in the fuel pipe component flow back to the fuel tank 1 through the second fuel pipe, thus solving the problem that the fuel pipe is vaporized by temperature to generate air resistance, resulting in difficult engine ignition. Therefore, the utility model effectively overcomes the disadvantages in the prior art and has high industrial utilization value.

[0036] The above embodiments merely illustrate the principles and effects of the utility model, rather than limiting the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the utility model should still be covered by the claims of the utility model.

Claims

1. A motor vehicle fuel system, comprising a fuel tank, a fuel pump, an injector component, and an engine. The fuel pump and the injector component are connected by a fuel pipe component. The fuel pump pumps the fuel in the fuel tank into the injector component, and the fuel acts on the injector component and enters the cylinders of the engine. It is characterized in that: The fuel pipe component includes a first fuel pipe and a second fuel pipe; the first fuel pipe connects the fuel pump and the injector component; The second fuel pipe connects the injector component and the fuel tank, and a pressure relief valve is installed on the second fuel pipe.

2. A motor vehicle fuel system according to claim 1, characterized in that: The engine is a twin-cylinder engine, and the twin-cylinder engine includes a first cylinder and a second cylinder.

3. A motor vehicle fuel system according to claim 2, characterized in that: The injector component includes a first injector and a second injector. The first injector is connected to the first cylinder, and the second injector is connected to the second cylinder; The first fuel pipe connects the fuel pump, the first injector, and the second injector in sequence, and the second fuel pipe connects the second injector and the fuel tank.

4. A motor vehicle fuel system according to claim 1, characterized in that: It further includes a fuel filter, and the fuel filter is installed on the fuel pump.

5. A motor vehicle fuel system according to claim 1, characterized in that: The injector component is a flapper valve injector.

6. A motor vehicle fuel system according to claim 1, characterized in that: The injector component is a multi-hole injector.

7. A motor vehicle fuel system according to claim 1, characterized in that: It further includes an oil pressure regulator, and the oil pressure regulator is installed at the outlet of the fuel pump.

8. A motor vehicle fuel system according to claim 1, characterized in that: It further includes an oil pressure pulsation damper, and the oil pressure pulsation damper is directly connected to the fuel pipe component.

9. A motor vehicle fuel system according to claim 1, characterized in that: A cold start switch is also installed on the injector component.

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