Fuel system and vehicle

Abstract

The utility model is suitable for the technical field of vehicles, and provides a fuel system and a vehicle, the fuel system comprises a metering proportional valve, an oil pump, an oil rail, an oil return control valve, an oil tank, an oil rail oil return pipe, an oil sprayer and a first oil return pipe, the metering proportional valve is connected between the oil pump and the oil tank, and the oil pump is connected with an oil inlet of the oil rail; a plurality of oil spraying openings in the oil rail are connected with a plurality of oil inlets in the oil sprayer in a one-to-one correspondence mode, an oil outlet of the oil sprayer is connected with the oil tank through a first oil return pipe, an oil outlet of the oil rail is connected with an oil inlet of the oil return control valve, and an oil outlet of the oil return control valve is connected with the oil tank through an oil rail oil return pipe. The metering proportional valve is used for adjusting the oil inlet amount of the oil rail, the oil return control valve is used for adjusting the oil outlet amount of the oil rail so as to adjust the rail pressure in the oil rail, and the oil rail oil return pipe is a flexible pipe. According to the fuel oil system, the problems that in the fuel oil system, only the metering proportional valve and the rail pressure sensor are used for controlling the rail pressure, so that the rail pressure following performance is poor, and engine noise is large can be solved.

Description

Technical Field

[0001] This application belongs to the technical field of vehicles, and particularly relates to a fuel system and a vehicle. Background Art

[0002] In the current fuel system of a vehicle, a metering proportional valve and a rail pressure sensor are provided. The rail pressure sensor collects the rail pressure signal in the fuel rail, and then controls the metering proportional valve to adjust the rail pressure in the fuel rail according to the rail pressure signal, so as to control the rail pressure in the fuel rail.

[0003] However, in medium and low load conditions, the demand for the rail pressure in the fuel rail drops rapidly. However, the control method using the metering proportional valve and the rail pressure sensor cannot meet the requirement of rapid rail pressure drop, and the rail pressure followability is poor, resulting in unstable oil pressure, unstable combustion, obvious increase in engine jitter and noise, and affecting the driving experience. Utility Model Content

[0004] The embodiments of this application provide a fuel system and a vehicle, which can solve the problem that only using the metering proportional valve and the rail pressure sensor to control the rail pressure in the fuel system results in poor rail pressure followability and large engine noise.

[0005] In a first aspect, the embodiments of this application provide a fuel system, including a metering proportional valve, a fuel pump, a fuel rail, a return oil control valve, a fuel tank, a fuel rail return pipe, an injector and a first return pipe. The metering proportional valve is connected between the fuel pump and the fuel tank. The fuel pump is connected to the inlet of the fuel rail. Multiple injection ports on the fuel rail are respectively connected to multiple inlets of the injectors in one-to-one correspondence. The outlet of the injector is connected to the fuel tank through the first return pipe. The outlet of the fuel rail is connected to the inlet of the return oil control valve. The outlet of the return oil control valve is connected to the fuel tank through the fuel rail return pipe;

[0006] The metering proportional valve is used to adjust the fuel inlet volume of the fuel rail, and the return oil control valve is used to adjust the fuel outlet volume of the fuel rail to adjust the rail pressure in the fuel rail. The fuel rail return pipe is a flexible pipe.

[0007] In a possible implementation manner of the first aspect, the fuel system further includes a second return pipe. The first end of the second return pipe is respectively connected to the first return pipe and the fuel rail return pipe, and the second end of the second return pipe is connected to the fuel tank.

[0008] In a possible implementation of the first aspect, the fuel system further includes an inlet pipe, a fixing bracket, and a plurality of fuel injection pipes. The fuel pump is connected to the inlet port of the fuel rail through the inlet pipe. A plurality of injection ports on the fuel rail are respectively connected to a plurality of inlet ports in the fuel injectors in one-to-one correspondence through the plurality of fuel injection pipes. The inlet pipe and one of the fuel injection pipes adjacent to the inlet pipe are respectively fixedly connected to the fixing bracket.

[0009] In a possible implementation of the first aspect, the inlet pipe is connected to the fixing bracket through a first soft gasket, and the fuel injection pipe is connected to the fixing bracket through a second soft gasket.

[0010] In a possible implementation of the first aspect, the first return pipe is fixedly connected to the inlet pipe.

[0011] In a possible implementation of the first aspect, the fuel rail return pipe has a bent area, and the bent area is used to reduce the flow rate of the fuel in the fuel rail return pipe.

[0012] In a possible implementation of the first aspect, the fuel system further includes a fuel filter, and the fuel filter is connected between the fuel tank and the metering proportional valve.

[0013] In a possible implementation of the first aspect, the fuel system further includes a relief valve. The inlet port of the relief valve is connected to the inlet port of the metering proportional valve, and the outlet port of the relief valve is connected to the fuel tank.

[0014] In a possible implementation of the first aspect, the fuel system further includes a controller and a rail pressure sensor. The controller is electrically connected to the rail pressure sensor, the fuel pump, the metering proportional valve, and the return oil control valve respectively;

[0015] The rail pressure sensor is used to collect the rail pressure information in the fuel rail and transmit the rail pressure information to the controller; the controller is used to control the fuel pump, the metering proportional valve, and the return oil control valve according to the rail pressure information.

[0016] In a second aspect, an embodiment of the present application provides a vehicle, including the fuel system according to any one of the first aspect.

[0017] The beneficial effects of the embodiments of the present application compared with the prior art are:

[0018] The fuel system according to the embodiment of the present application includes a metering proportional valve, an oil pump, an oil rail, a return oil control valve, a fuel tank, an oil rail return pipe, an injector, and a first return pipe. The metering proportional valve is connected between the oil pump and the fuel tank. The oil pump is connected to the inlet of the oil rail. A plurality of injection ports on the oil rail are respectively connected to a plurality of inlets of the injector in one-to-one correspondence. The outlet of the injector is connected to the fuel tank through the first return pipe. The outlet of the oil rail is connected to the inlet of the return oil control valve. The outlet of the return oil control valve is connected to the fuel tank through the oil rail return pipe.

[0019] When adjusting the rail pressure of the oil rail, by controlling the opening of the metering proportional valve and the rotation speed of the oil pump, the fuel intake of the oil rail can be adjusted. By adjusting the opening of the return oil control valve, the fuel outlet of the oil rail can be adjusted. Compared with the traditional fuel system that only adjusts the rail pressure by adjusting the fuel intake of the oil rail, the fuel system provided by the embodiment of the present application adjusts both the fuel intake and the fuel outlet of the oil rail, which can adjust the rail pressure in the oil rail more quickly, make the rail pressure in the oil rail more reasonable and stable, make the fuel burn more fully, and thus reduce the vibration and noise of the engine.

[0020] At the same time, the outlet of the return oil control valve is connected to the fuel tank through the oil rail return pipe. The fuel flowing out of the outlet of the return oil control valve flows back to the fuel tank through the oil rail return pipe. Since the oil rail return pipe is a flexible pipe, when the fuel flowing out of the return oil control valve passes through the oil rail return pipe, the hydraulic fluctuation generated by the fuel flow can be slowed down, and the sound generated by the hydraulic fluctuation can be reduced, thereby achieving the effect of reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a connection schematic diagram of the fuel system provided by an embodiment of the present application:

[0023] Figure 2 It is a connection schematic diagram of the fuel system provided by another embodiment of the present application:

[0024] Figure 3 It is a structural schematic diagram of the fuel system provided by an embodiment of the present application;

[0025] Figure 4 It is a connection schematic diagram of the fuel system provided by yet another embodiment of the present application.

[0026] In the figure: 10, metering proportional valve; 11, oil pump; 12, fuel rail; 13, return oil control valve; 14, fuel tank; 15, fuel rail return pipe; 16, fuel injector; 17, first return pipe; 18, second return pipe; 19, inlet pipe; 20, fuel injection pipe; 21, fuel filter; 22, fixing bracket; 23, first pipe clamp; 24, second pipe clamp. Detailed implementation manners

[0027] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0028] It should be understood that when used in the specification of the present application and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0029] It should also be understood that the term "and / or" used in the specification of the present application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] As used in the specification of the present application and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0031] In addition, in the description of the specification of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0032] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in another way. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in another way.

[0033] When the load of the engine rapidly decreases, the engine speed rapidly decreases, and at this time, the rail pressure in the fuel rail needs to rapidly decrease. However, the control method using the metering proportional valve and the rail pressure sensor cannot rapidly reduce the rail pressure in the fuel rail, which will cause unstable fuel combustion, resulting in obvious increase in engine jitter and noise, and affecting the driving experience.

[0034] Based on the above problems, an embodiment of this application provides a fuel system. Refer to Figure 1 As shown, the fuel system includes a metering proportional valve 10, a fuel pump 11, a fuel rail 12, a return oil control valve 13, a fuel tank 14, a fuel rail return pipe 15, an injector 16, and a first return pipe 17. The metering proportional valve 10 is connected between the fuel pump 11 and the fuel tank 14. The fuel pump 11 is connected to the inlet of the fuel rail 12. Multiple injection ports on the fuel rail 12 are respectively connected to multiple inlets of the injector 16 in a one-to-one correspondence. The outlet of the injector 16 is connected to the fuel tank 14 through the first return pipe 17. The outlet of the fuel rail 12 is connected to the inlet of the return oil control valve 13. The outlet of the return oil control valve 13 is connected to the fuel tank 14 through the fuel rail return pipe 15.

[0035] Specifically, when the fuel pump 11 works, the fuel in the fuel tank 14 enters the fuel rail 12 through the metering proportional valve 10 and the fuel pump 11. The fuel in the fuel rail 12 enters the fuel injector nozzle in the injector 16 for fuel injection and ignition to drive the engine to rotate. The excess fuel in the injector 16 will flow back to the fuel tank 14 through the first return pipe 17, and the fuel in the fuel rail 12 will flow back to the fuel tank 14 through the return oil control valve 13 and the fuel rail return pipe 15.

[0036] When adjusting the rail pressure of the fuel rail 12, the fuel intake of the fuel rail 12 can be adjusted by controlling the opening of the metering proportional valve 10 and the rotational speed of the fuel pump 11, and the fuel output of the fuel rail 12 can be adjusted by adjusting the opening of the return oil control valve 13. Compared with the traditional fuel system that only adjusts the rail pressure by adjusting the fuel intake of the fuel rail 12, the fuel system provided by the embodiment of the present application adjusts both the fuel intake and the fuel output of the fuel rail 12, which can adjust the rail pressure in the fuel rail 12 more quickly, make the rail pressure in the fuel rail 12 more reasonable and stable, and further make the fuel injection and combustion of the injector 16 more sufficient, thereby reducing the vibration and noise of the engine.

[0037] At the same time, the oil outlet of the return oil control valve 13 is connected to the fuel tank 14 through the fuel rail return pipe 15, and the fuel flowing out of the oil outlet of the return oil control valve 13 flows back to the fuel tank 14 through the fuel rail return pipe 15. The fuel rail return pipe 15 is a flexible pipe. For example, the fuel rail return pipe 15 can be selected as a rubber hose. Since the fuel rail return pipe 15 is made of soft material, when the fuel flowing out of the return oil control valve 13 passes through the fuel rail return pipe 15, the hydraulic fluctuation generated by the fuel flow can be slowed down, and the sound generated by the hydraulic fluctuation can be reduced, thereby achieving the effect of reducing noise.

[0038] The oil outlet of the injector 16 is connected to the fuel tank 14 through the first return pipe 17, and the oil outlet of the return oil control valve 13 is connected to the fuel tank 14 through the fuel rail return pipe 15. Both the first return pipe 17 and the fuel rail return pipe 15 need to be connected to the fuel tank 14. A longer first return pipe 17 is required to connect the injector 16 and the fuel tank 14, and a longer fuel rail return pipe 15 is required to connect the return oil control valve 13 and the fuel tank 14. This increases the length of the pipeline used, resulting in the problem of increased cost. Also, because the length of the pipeline is increased, more space is required for the pipeline, which increases the difficulty of pipeline layout.

[0039] Based on the above problems, as Figure 2 shown, the embodiment of the present application also provides a second return pipe 18 in the fuel system. The first end of the second return pipe 18 is respectively connected to the first return pipe 17 and the fuel rail return pipe 15, and the second end of the second return pipe 18 is connected to the fuel tank 14.

[0040] Specifically, the first end of the second return pipe 18 is respectively connected to the first return pipe 17 and the fuel rail return pipe 15, and the second end of the second return pipe 18 is connected to the fuel tank 14. This can reduce the length of the first return pipe 17 and the fuel rail return pipe 15, thereby reducing the overall pipeline length of the fuel system, achieving the effect of reducing cost. Also, because the length of the pipeline is reduced, the occupied space of the pipeline is further reduced, the flexibility of pipeline layout is improved, and the difficulty of pipeline layout is reduced.

[0041] In some embodiments, as Figure 2 andFigure 3 As shown, the fuel system further includes an inlet pipe 19, a fixing bracket 22, and a plurality of fuel injection pipes 20. The fuel pump 11 is connected to the fuel inlet of the fuel rail 12 through the inlet pipe 19. A plurality of fuel injection ports on the fuel rail 12 are respectively connected to a plurality of fuel inlets in the fuel injector 16 through a plurality of fuel injection pipes 20 in a one-to-one correspondence. The inlet pipe 19 and a fuel injection pipe 20 adjacent to the inlet pipe 19 are respectively fixedly connected to the fixing bracket 22.

[0042] Specifically, when the fuel flows in the inlet pipe 19, it will cause the vibration of the inlet pipe 19. Similarly, when the fuel flows in the fuel injection pipe 20, it will also cause the vibration of the fuel injection pipe 20. Since the fuel flow rates in the inlet pipe 19 and the fuel injection pipe 20 are different, the vibration frequencies of the inlet pipe 19 caused by the fuel flow and the vibration frequency of the fuel injector 16 caused by the fuel are different. Connecting the inlet pipe 19 and a fuel injection pipe 20 adjacent to the inlet pipe 19 to the fixing bracket 22 respectively, that is, connecting the inlet pipe 19 to a fuel injection pipe 20. Since the vibration frequencies of the inlet pipe 19 and the fuel injection pipe 20 are different, after they are fixedly connected, the overall vibration amplitude can be reduced, and thus the noise caused by the pipeline vibration can be reduced.

[0043] In some embodiments, the inlet pipe 19 is connected to the fixing bracket 22 through a first soft gasket, and the fuel injection pipe 20 is connected to the fixing bracket 22 through a second soft gasket.

[0044] Specifically, a first soft gasket is provided between the inlet pipe 19 and the fixing bracket 22. The first soft gasket can be a gasket made of rubber material. The first soft gasket can play a buffering role, reduce the resonance effect between the fixing bracket 22 and the inlet pipe 19, thereby reducing the vibration amplitude of the fixing bracket 22 and the inlet pipe 19, and reducing the noise generated by the vibration.

[0045] Similarly, a second soft gasket is provided between the fuel injection pipe 20 and the fixing bracket 22. The second soft gasket can play a buffering role, reduce the resonance effect between the fuel injection pipe 20 and the fixing bracket 22, thereby reducing the vibration amplitude of the fuel injection pipe 20 and the fixing bracket 22, and reducing the noise generated by the vibration.

[0046] In some embodiments, the first return pipe 17 is fixedly connected to the inlet pipe 19.

[0047] Specifically, the fuel flow rates in the first return pipe 17 and the inlet pipe 19 are different. Therefore, the vibration frequencies of the first return pipe 17 and the inlet pipe 19 are different. Connecting the first return pipe 17 to the inlet pipe 19 fixedly (for example, as shown in Figure 3 The first return pipe 17 and the inlet pipe 19 can be fixed through a first pipe clamp 23), which can play a role in reducing the resonance between the first return pipe 17 and the inlet pipe 19, thereby reducing the noise generated by the vibration of the first return pipe 17 and the inlet pipe 19.

[0048] In some embodiments, as Figure 3 shown, the first fuel return pipe 17 and a fuel injection pipe 20 are fixedly connected by a second pipe clamp 24.

[0049] Specifically, the flow rates of the fuel in the first fuel return pipe 17 and the fuel injection pipe 20 are different. Therefore, the vibration frequencies of the first fuel return pipe 17 and the fuel injection pipe 20 are different. Fixing the first fuel return pipe 17 and the fuel injection pipe 20 by the second pipe clamp 24 can reduce the resonance between the first fuel return pipe 17 and the fuel injection pipe 20, thereby reducing the noise generated by the vibration of the first fuel return pipe 17 and the fuel injection pipe 20.

[0050] In some embodiments, as Figure 3 shown, the fuel rail return pipe 15 has a bent region, and the bent region is used to reduce the flow rate of the fuel in the fuel rail return pipe 15.

[0051] Specifically, the rail pressure of the fuel in the fuel rail 12 is relatively high. When the fuel in the fuel rail 12 enters the fuel rail return pipe 15 through the fuel return control valve 13, the pressure of the fuel will decrease, and the flow rate of the fuel is relatively large, thereby generating noise. In this application, the fuel rail return pipe 15 has a bent region, that is, the fuel rail return pipe 15 is arranged in a bent shape. When the fuel flowing out of the fuel return control valve 13 enters the fuel rail return pipe 15, due to the existence of the bent region, the flow rate impact of the fuel will be reduced, preventing the noise caused by the too fast fuel flow rate, and achieving the effect of reducing noise.

[0052] In some embodiments, as Figure 4 shown, the fuel system further includes a fuel filter 21, and the fuel filter 21 is connected between the fuel tank 14 and the metering proportional valve 10.

[0053] Specifically, the fuel filter 21 can filter impurities in the fuel system, prevent the impurities from entering the fuel rail 12 and the fuel injector 16, causing blockage of the fuel rail 12 or the fuel injector 16, and improving the stability of the fuel system.

[0054] In some embodiments, the fuel system further includes an overflow valve. The inlet of the overflow valve is connected to the inlet of the metering proportional valve 10, and the outlet of the overflow valve is connected to the fuel tank 14.

[0055] Specifically, when the fuel pressure in the pipeline between the metering proportional valve 10 and the fuel tank 14 is too high, the fuel in the pipeline between the metering proportional valve 10 and the fuel tank 14 can flow back to the fuel tank 14 through the overflow valve, so that the pressure of the fuel in the pipeline between the metering proportional valve 10 and the fuel tank 14 is maintained at a stable pressure, improving the stability of the fuel system.

[0056] In some embodiments, the fuel system further includes a controller and a rail pressure sensor. The controller is electrically connected to the rail pressure sensor, the fuel pump 11, the metering proportional valve 10, and the return oil control valve 13 respectively.

[0057] Specifically, the rail pressure sensor is disposed on the fuel rail 12 and is configured to collect the rail pressure information in the fuel rail 12 and transmit the rail pressure information to the controller. The controller is configured to control the fuel pump 11, the metering proportional valve 10, and the return oil control valve 13 according to the rail pressure information, so that the pressure of the fuel in the fuel rail 12 is maintained within a set pressure range, ensuring that the fuel in the fuel rail 12 can enter the fuel injector 16, ensuring that the fuel injector 16 injects fuel and ignites as required, and determining that the engine rotates, thereby realizing the driving of the vehicle.

[0058] The traditional method of controlling the rail pressure by using the metering proportional valve 10 and the rail pressure sensor is greatly affected by temperature and engine speed. When the engine is at low speed and starting condition, the fuel temperature is relatively low, and the regulation of the rail pressure is relatively slow, resulting in poor starting ability of the engine. The engine starts unevenly and the starting time is relatively long, which is more obvious in the cold start of the engine.

[0059] Based on the above problems, when the controller in the fuel system of the present application recognizes that the engine is at low speed and starting condition, it controls the metering proportional valve 10 to be fully opened, that is, the opening degree of the metering proportional valve 10 is adjusted to 100%, and then adjusts the opening degree of the return oil control valve 13 according to the rail pressure information collected by the rail pressure sensor. Thereby, the heat exchange between the fuel inside the fuel rail 12 and the external fuel can be reduced, and the effect of quickly increasing the fuel temperature inside the fuel rail 12 can be achieved, thereby improving the starting ability of the engine.

[0060] When the engine is at idle speed condition, that is, when the engine is at medium and low load, the rail pressure demand in the fuel rail 12 drops relatively fast. However, the control method using the metering proportional valve 10 and the rail pressure sensor cannot meet the requirement of rapid rail pressure drop, and the rail pressure followability is poor, resulting in unstable oil pressure, unstable combustion, obvious increase in engine vibration and noise, and affecting the driving experience.

[0061] Based on the above problems, when the controller in the fuel system of the present application recognizes that the engine is at idle speed condition, that is, when the engine is at medium and low load, the controller adjusts the opening degrees of the metering proportional valve 10 and the return oil control valve 13 according to the rail pressure information at the same time, that is, adjusts the fuel inlet amount and the fuel outlet amount of the fuel rail 12 at the same time, which can adjust the rail pressure in the fuel rail 12 more quickly, make the rail pressure in the fuel rail 12 more reasonable and stable, make the fuel combustion more sufficient, and thereby reduce the vibration and noise of the engine.

[0062] When the controller recognizes that the engine is in a high-speed operating condition, that is, when the engine is under a large load, the controller controls the oil return control valve 13 to open completely, that is, adjusts the opening degree of the oil return control valve 13 to 100%, and then adjusts the opening degree of the metering proportional valve 10 according to the rail pressure information collected by the rail pressure sensor, thereby improving the power output performance of the engine and enabling the engine to output a greater torque.

[0063] This application also discloses a vehicle, including the fuel system described above. When adjusting the rail pressure of the fuel rail, the fuel inflow of the fuel rail can be adjusted by controlling the opening degree of the metering proportional valve and the rotational speed of the oil pump, and the fuel outflow of the fuel rail can be adjusted by adjusting the opening degree of the oil return control valve. Compared with the traditional fuel system that only adjusts the fuel inflow of the fuel rail to adjust the rail pressure, the fuel system provided by the embodiments of this application adjusts both the fuel inflow and the fuel outflow of the fuel rail, can adjust the rail pressure in the fuel rail more quickly, make the rail pressure in the fuel rail more reasonable and stable, make the fuel combustion more complete, and thus reduce the engine jitter and noise.

[0064] At the same time, the oil outlet of the oil return control valve is connected to the fuel tank through the fuel rail return pipe, and the fuel flowing out of the oil outlet of the oil return control valve flows back to the fuel tank through the fuel rail return pipe. Since the fuel rail return pipe is a flexible pipe, when the fuel flowing out of the oil return control valve passes through the fuel rail return pipe, the hydraulic fluctuation generated by the fuel flow can be slowed down, and the sound generated by the hydraulic fluctuation can be reduced, thereby achieving the effect of reducing noise.

[0065] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included in the protection scope of this application.

Claims

1. A fuel system, characterized in that, It includes a metering proportional valve, an oil pump, an oil rail, a return oil control valve, a fuel tank, an oil rail return pipe, an injector and a first return pipe. The metering proportional valve is connected between the oil pump and the fuel tank. The oil pump is connected to the inlet of the oil rail. Multiple injection ports on the oil rail are respectively and correspondingly connected to multiple inlets of the injectors one by one. The outlet of the injector is connected to the fuel tank through the first return pipe. The outlet of the oil rail is connected to the inlet of the return oil control valve. The outlet of the return oil control valve is connected to the fuel tank through the oil rail return pipe; The metering proportional valve is used to adjust the fuel injection volume of the oil rail, and the return oil control valve is used to adjust the oil output volume of the oil rail to adjust the rail pressure in the oil rail. The oil rail return pipe is a flexible pipe.

2. The fuel system according to claim 1, characterized in that, The fuel system further includes a second return pipe. The first end of the second return pipe is respectively connected to the first return pipe and the oil rail return pipe, and the second end of the second return pipe is connected to the fuel tank.

3. The fuel system according to claim 1, characterized in that, The fuel system further includes an inlet pipe, a fixing bracket and multiple injection pipes. The oil pump is connected to the inlet of the oil rail through the inlet pipe. Multiple injection ports on the oil rail are respectively and correspondingly connected to multiple inlets of the injectors through multiple injection pipes one by one. The inlet pipe and one injection pipe adjacent to the inlet pipe are respectively fixedly connected to the fixing bracket.

4. The fuel system according to claim 3, wherein, The inlet pipe is connected to the fixing bracket through a first soft gasket, and the injection pipe is connected to the fixing bracket through a second soft gasket.

5. The fuel system according to claim 3, wherein The first return pipe is fixedly connected to the inlet pipe.

6. The fuel system according to claim 1, characterized in that, The oil rail return pipe has a bent area, and the bent area is used to reduce the flow rate of the fuel in the oil rail return pipe.

7. The fuel system according to claim 1, characterized in that, The fuel system further includes a fuel filter, and the fuel filter is connected between the fuel tank and the metering proportional valve.

8. The fuel system according to claim 1, characterized in that, The fuel system further includes a relief valve. The inlet of the relief valve is connected to the inlet of the metering proportional valve, and the outlet of the relief valve is connected to the fuel tank.

9. The fuel system according to any one of claims 1-8, characterized in that, The fuel system further includes a controller and a rail pressure sensor. The controller is electrically connected to the rail pressure sensor, the oil pump, the metering proportional valve and the return oil control valve respectively; The rail pressure sensor is used to collect the rail pressure information in the oil rail and transmit the rail pressure information to the controller; The controller is used to control the oil pump, the metering proportional valve and the return oil control valve according to the rail pressure information.

10. A vehicle, characterized in that, It includes the fuel system according to any one of claims 1-9.

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