Fuel injection system

Abstract

The embodiment of the invention provides a fuel injection system. The fuel injection system comprises a high-pressure pump, a fuel supply assembly and an injection assembly, the high-pressure pump comprises a first feeding port and a first discharging port, the first feeding port is connected with the fuel supply assembly, and the first discharging port is connected with the injection assembly; the rotating assembly comprises a cam shaft and a tappet, the first end of the cam shaft is connected with the motor, the second end of the cam shaft is movably connected with the high-pressure pump through the tappet, and under the condition that the motor rotates, the second end of the cam shaft drives the tappet to move, so that fuel stored in a pump cavity of the high-pressure pump is high-pressure fuel; the mounting seat comprises a mounting cavity, the second end of the cam shaft and the tappet are mounted in the mounting cavity, and the high-pressure pump is detachably connected with the mounting seat. Therefore, related fuel injection characteristic tests of the fuel injection system can be performed independent of the engine, different fuel injection characteristic tests can be met, and the preparation cost of the fuel injection system can be further reduced.

Description

Technical Field

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

[0002] To meet the fuel consumption and emission requirements of internal combustion engines, it is necessary to test the injection conditions of different fuels under high pressure. However, in related technologies, the structures of systems or devices for testing the injection conditions of different fuels under high pressure are relatively complex, and different high-pressure injection devices need to be replaced for different fuels, thereby increasing the testing cost and reducing the testing efficiency. Summary of the Invention

[0003] To solve or partially solve the above problems, this application discloses a fuel injection system, aiming to solve the problem that different high-pressure injection devices need to be replaced for different fuels, thereby increasing the testing cost and reducing the testing efficiency.

[0004] To solve the above problems, an embodiment of this application provides a fuel injection system, including:

[0005] A high-pressure pump, a fuel supply component, and an injection component. The high-pressure pump includes a first inlet and a first outlet. The first inlet is connected to the fuel supply component, and the first outlet is connected to the injection component;

[0006] A motor and a rotating component. The rotating component includes a camshaft and a tappet. The first end of the camshaft is connected to the motor, and the second end of the camshaft is movably connected to the high-pressure pump through the tappet. When the motor rotates, the second end of the camshaft drives the tappet to move, so that the fuel stored in the pump chamber of the high-pressure pump becomes high-pressure fuel;

[0007] A mounting seat. The mounting seat includes a mounting cavity. The second end of the camshaft and the tappet are installed in the mounting cavity, and the high-pressure pump is detachably connected to the mounting seat.

[0008] Since the high-pressure pump includes a first feed port and a first discharge port, the first feed port is connected to the fuel supply assembly, and the first discharge port is connected to the injection assembly. The rotating assembly includes a camshaft and a tappet. The first end of the camshaft is connected to the motor, and the second end of the camshaft is connected to the high-pressure pump through the tappet. Therefore, the rotation of the camshaft can be controlled by the motor. The second end of the camshaft drives the tappet to move, so that the fuel stored in the pump chamber of the high-pressure pump becomes high-pressure fuel, and then high-pressure fuel is provided to the injection assembly through the first discharge port. Furthermore, the injection assembly can be controlled to inject fuel independently of the engine. Thus, relevant fuel injection characteristic tests of the fuel injection system can be carried out independently of the engine. Also, since the mounting seat includes a mounting cavity, the second end of the camshaft and the tappet are installed in the mounting cavity, and the high-pressure pump is detachably connected to the top wall of the mounting seat. Therefore, by replacing the structural tooling in the mounting seat that matches the high-pressure pump, high-pressure pumps of different models, different displacements, and different fuels used can be adapted, flexibly meeting different fuel injection characteristic tests. In summary, through the fuel injection system provided by the embodiments of the present application, not only can relevant fuel injection characteristic tests of the fuel injection system be carried out independently of the engine, but also due to the detachable nature of the high-pressure pump and the ability to adapt high-pressure pumps of different models, different displacements, and different fuels used, different fuel injection characteristic tests can be satisfied. Furthermore, the manufacturing cost of the fuel injection system can be reduced, the test cost of the fuel injection characteristic test can be reduced, and the test efficiency can be improved.

[0009] In some embodiments, the second end of the camshaft includes a rotating disk;

[0010] The rotating disk includes two contact parts oppositely arranged in the radial direction. The distance between the contact part and the high-pressure pump is less than the distance between other parts of the rotating disk except the contact part and the high-pressure pump;

[0011] When the contact part contacts the bottom of the tappet, the fuel stored in the pump chamber of the high-pressure pump is high-pressure fuel.

[0012] In this way, through the cooperation of the second end of the camshaft and the tappet, the driving of the high-pressure pump and the output of high-pressure fuel can be achieved, making the output structure of the entire high-pressure fuel simple, the output of high-pressure fuel efficient, facilitating the installation of the fuel injection system, and being conducive to reducing the installation and manufacturing cost of the fuel injection system.

[0013] In some embodiments, the fuel supply assembly includes a supply pipeline, a low-pressure pump, and a fuel storage tank;

[0014] The low-pressure pump includes a second feed port and a second discharge port. The second feed port is communicated with the fuel storage tank through the supply pipeline, and the second discharge port is communicated with the first feed port through the supply pipeline.

[0015] In this way, since the low-pressure pump includes a second inlet and a second outlet, the second inlet is connected to the fuel storage tank through a supply pipeline, and the second outlet is connected to the first inlet through a supply pipeline, stable input of fuel can be achieved through the low-pressure pump.

[0016] In some embodiments, a control valve and an external fuel supply assembly are further connected in the supply pipeline between the second outlet and the first inlet;

[0017] The control valve includes a first interface, a second interface, and a first outlet. The first interface is connected to the second outlet through the supply pipeline, the second interface is connected to the external fuel supply assembly, and the first outlet is connected to the first inlet through the supply pipeline;

[0018] When the first interface is closed, the second interface is connected to the first outlet; when the second interface is closed, the first interface is connected to the first outlet.

[0019] In this way, since the low-pressure pump includes a second inlet and a second outlet, the second inlet is connected to the fuel storage tank through a supply pipeline, and the second outlet is connected to the first inlet through a supply pipeline, stable input of fuel can be achieved through the low-pressure pump.

[0020] In some embodiments, a pressure measurement and control assembly is further connected in the supply pipeline between the first outlet and the first inlet; the pressure measurement and control assembly includes a pressure regulating valve and a pressure gauge. The pressure regulating valve is arranged in the supply pipeline between the first outlet and the first inlet, and the pressure gauge is arranged in the supply pipeline between the pressure regulating valve and the first inlet.

[0021] In this way, by arranging a pressure regulating valve in the supply pipeline between the first outlet and the first inlet, the pressure in the low-pressure fuel supply pipe can be adjusted by controlling the opening amount of the internal valve to control the fuel flow, which is convenient for adjusting the supply pressure in the supply pipeline. The real-time supply pressure in the supply pipeline can be detected through the pressure gauge, which is used to control the supply pressure in real time by the pressure regulating valve, so that the entire supply pressure is safe and controllable.

[0022] In some embodiments, the fuel storage tank is provided with a heat exchange assembly; the heat exchange assembly includes a temperature control pipeline wound around the inner wall of the fuel storage tank. The temperature control pipeline includes a medium inlet and a medium outlet. The medium inlet is used for inputting a heat exchange medium, and the medium outlet is used for outputting the heat exchange medium after heat exchange.

[0023] In this way, the controllability of the fuel temperature is achieved through the heat exchange component, thereby expanding the diversity of fuel injection tests, reducing the limitations of fuel temperature on injection tests, and providing a condition guarantee for more in-depth injection tests.

[0024] In some embodiments, the installation cavity is a closed cavity, and a lubricating medium is filled in the installation cavity;

[0025] The lubricating medium infiltrates at least half of the diameter of the camshaft, and simultaneously infiltrates the connection part between the second end of the camshaft and the tappet.

[0026] In this way, the smooth rotation of the rotating component can be ensured through the lubricating medium, and the normal driving of the high-pressure pump can be ensured.

[0027] In some embodiments, the injection assembly includes a main injector, a sub-injector, and a pressure stabilizing chamber;

[0028] The pressure stabilizing chamber is communicated with the first discharge port;

[0029] The main injector includes a third feed port and a first injection end, the sub-injector includes a fourth feed port and a second injection end, the third feed port and the fourth feed port are respectively communicated with the pressure stabilizing chamber, and the second injection end is communicated with the first feed port;

[0030] When the first injection end is in the injection state, the second injection end is in the stop working state, and when the first injection end is in the stop working state, the second injection end is in the injection state.

[0031] In this way, when the fuel pressure is established, the sub-injector can be in the working state to supply fuel to the high-pressure pump simultaneously with the fuel supply component to ensure that the system pressure fluctuation is as small as possible. When the main injector needs to work, it can be switched to the sub-injector to stop working, so as to ensure the stable supply pressure and also ensure the high-pressure fuel supply capacity under high-pressure injection and large injection pulse widths.

[0032] In some embodiments, the injection assembly further includes a detection module and a controller;

[0033] The detection module further includes a pressure sensor, a high-pressure meter, and a temperature sensor. The pressure sensor is installed inside the pressure stabilizing chamber, and the high-pressure meter and the temperature sensor are connected in the communication pipeline between the pressure stabilizing chamber and the first injection end.

[0034] The detection module, the main injector, and the sub-injector are all electrically connected to the controller.

[0035] In this way, when the main injector is operating, the high-pressure meter can monitor and calculate the injection volume of the main injector in real time, effectively measure the fuel consumption of the main injector in a timely manner. At the same time, the configuration of the high-pressure meter can meet the measurement of fuel consumption in a test bench without an oil consumption meter, enhancing the versatility of the fuel injection system during testing. Meanwhile, the temperature sensor can provide real-time feedback on the fuel temperature, which is beneficial for the fuel supply component to provide an appropriate fuel temperature. In addition, the pressure sensor can detect the supply pressure of the pressure stabilizing chamber and feed back the supply pressure to the controller, making the fuel supply pressure during the entire injection process safe and controllable.

[0036] In some embodiments, the injection assembly further includes a first mounting member and a second mounting member;

[0037] The main injector is mounted on the first component through the first mounting member. The first mounting member includes a first pressing block and a second pressing block arranged at intervals, and the main injector is mounted between the first pressing block and the second pressing block. Among them, the first component includes an engine and a test device;

[0038] The auxiliary injector is mounted on the pressure stabilizing chamber through the second mounting member. The second mounting member includes a third pressing block and a fourth pressing block arranged at intervals, and the auxiliary injector is mounted between the third pressing block and the fourth pressing block.

[0039] In this way, the assembly between the various components of the fuel injection system is simple, easy to disassemble and assemble. In the case of damage to each component, it can be repaired or replaced in a timely manner, reducing the maintenance cost and the repair cycle. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 is a schematic structural diagram of the fuel injection system provided by the embodiments of the present application;

[0042] Figure 2 is an assembly schematic diagram of the rotating assembly and the high-pressure pump included in the fuel injection system provided by the embodiments of the present application;

[0043] Figure 3 is an assembly schematic diagram of the main injector included in the fuel injection system provided by the embodiments of the present application.

[0044] Explanation of the Reference Numerals in the Drawings:

[0045] 1: High-pressure pump; 11: First feed port; 12: First discharge port; 2: Fuel supply assembly; 21: Supply pipeline; 22: Low-pressure pump; 221: Second feed port; 222: Second discharge port; 23: Fuel storage tank; 231: Heat exchange assembly; 3: Injection assembly; 31: Main injector; 32: Auxiliary injector; 33: Pressure stabilizing chamber; 34: First mounting member; 341: First pressing block; 342: Second pressing block; 4: Motor; 5: Rotating assembly; 51: Camshaft; 52: Tappet; 6: Mounting seat; 7: Control valve; 71: First interface; 72: Second interface; 73: First outlet; 8: Pressure measurement and control assembly; 81: Pressure regulating valve; 82: Pressure gauge; 9: Detection module; 91: Pressure sensor; 92: High-pressure meter; 93: Temperature sensor; 10: Controller; 01: Power supply and system control cabinet; 02: Check valve; 03: Coupling; 04: Encoder. Detailed implementation manners

[0046] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "a plurality of" means two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0047] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0048] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0049] Please refer to Figures 1 to 3 , an embodiment of this application provides a fuel injection system, including:

[0050] A high-pressure pump 1, a fuel supply assembly 2, and an injection assembly 3. The high-pressure pump 1 includes a first feed port 11 and a first discharge port 12. The first feed port 11 is connected to the fuel supply assembly 2, and the first discharge port 12 is connected to the injection assembly 3.

[0051] A motor 4 and a rotating assembly 5. The rotating assembly 5 includes a camshaft 51 and a tappet 52. The first end of the camshaft 51 is connected to the motor 4, and the second end of the camshaft 51 is connected to the high-pressure pump 1 through the tappet 52. When the motor 4 rotates, the second end of the camshaft 51 drives the tappet 52 to move, so that the fuel stored in the pump chamber of the high-pressure pump 1 is high-pressure fuel.

[0052] A mounting seat 6. The mounting seat 6 includes a mounting cavity. The second end of the camshaft 51 and the tappet 52 are installed in the mounting cavity, and the high-pressure pump 1 is detachably connected to the mounting seat 6.

[0053] It can be seen from the above embodiments that since the high-pressure pump 1 includes a first feed port 11 and a first discharge port 12, the first feed port 11 is connected to the fuel supply assembly 2, and the first discharge port 12 is connected to the injection assembly 3, and the rotating assembly 5 includes a camshaft 51 and a tappet 52, the first end of the camshaft 51 is connected to the motor 4, and the second end of the camshaft 51 is connected to the high-pressure pump 1 through the tappet 52. Therefore, the rotation of the camshaft 51 can be controlled by the motor 4, and the second end of the camshaft 51 drives the tappet 52 to move, so that the fuel stored in the pump chamber of the high-pressure pump 1 is high-pressure fuel. Furthermore, high-pressure fuel is provided to the injection assembly 3 through the first discharge port 12, and then the injection assembly 3 can be controlled to perform injection independently of the engine. Thus, relevant fuel injection characteristic tests of the fuel injection system can be carried out independently of the engine. Also, since the mounting seat 6 includes a mounting cavity, the second end of the camshaft 51 and the tappet 52 are installed in the mounting cavity, and the high-pressure pump 1 is detachably connected to the mounting seat 6. Therefore, by replacing the structural tooling in the mounting seat 6 that matches the high-pressure pump 1, high-pressure pumps 1 of different models, different displacements, and different fuels used can be adapted, flexibly meeting different fuel injection characteristic tests. In summary, through the fuel injection system provided by the embodiments of the present application, not only can relevant fuel injection characteristic tests of the fuel injection system be carried out independently of the engine, but also due to the detachability of the high-pressure pump 1 and the ability to adapt high-pressure pumps 1 of different models, different displacements, and different fuels used, different fuel injection characteristic tests can be satisfied. Furthermore, the manufacturing cost of the fuel injection system can be reduced, the test cost of the fuel injection characteristic test can be reduced, and the test efficiency can be improved.

[0054] Among them, the high-pressure pump 1 in the above embodiments is a pump that can output a relatively high pressure. The high-pressure pump 1 in the fuel injection system is mainly used to provide sufficient fuel pressure to ensure that the fuel can be efficiently and accurately injected into the preset components, thereby improving the combustion efficiency and engine performance. The high-pressure pump 1 includes a pump body, a pump housing, a piston, a cylinder liner, a first inlet 11 and a first outlet 12. The first inlet 11 and the first outlet 12 are arranged on the pump body. The first inlet 11 is used for the input of fuel, and the first outlet 12 is used for the output of fuel. The piston moves in the pump body and can convert the fuel entering from the first inlet 11 into high-pressure fuel. The material of the pump body is usually cast steel, cast iron or aluminum alloy. The cylinder liner plays a role in isolating the piston from the pump body, so that the piston can move in the pump body without hindrance. In this way, by connecting the first inlet 11 with the fuel supply assembly 2 and the first outlet 12 with the injection assembly 3, the fuel can enter the pump body of the high-pressure pump 1 through the first inlet 11, be compressed into high-pressure fuel by the movement of the piston, and then be output to the injection assembly 3 through the first outlet 12.

[0055] The motor 4 can be a kind of drive motor. The motor 4 can change the speed and torque through the frequency converter in the electrical box. The drive shaft of the motor 4 can be connected to the first end of the camshaft 51 through the coupling 03, so that the camshaft 51 can rotate coaxially with the drive shaft of the motor 4. In addition, an encoder 04 can be arranged at the connection part of the camshaft 51 and the drive shaft of the motor 4. Through the encoder 04, the speed and angle signals of the camshaft 51 can be collected. When the motor 4 rotates, the encoder 04 can record the position and perform internal calibration of the automatic control program for the second end of the camshaft 51, so as to control the speed of the motor 4 in real time.

[0056] To facilitate the replacement of the above high-pressure pump 1 and the rotating assembly 5, in the embodiments of the present application, a mounting seat 6 is provided. The mounting seat 6 can be a square shell structure, so that the mounting seat 6 can have sufficient mounting space for mounting the camshaft 51 and the tappet 52, and at the same time can also have sufficient mounting surfaces for mounting the high-pressure pump 1. The high-pressure pump 1 can be detachably connected to the top wall of the mounting seat 6 by means of bolt connection, snap connection, rivet connection, etc. The camshaft 51 can be installed on the mounting seat 6 by an interference fit through a ball bearing, so that the camshaft 51 can rotate relative to the mounting seat 6. A sealing member can be arranged at the mounting position of the camshaft 51 and the mounting seat 6 to ensure the sealing performance of the mounting cavity.

[0057] It should be noted that the second end of the camshaft 51 can be a disk structure with unequal circles, that is, the diameters of the end faces of the second end of the camshaft 51 are unequal, or in other words, the distances between various positions on the circumferential surface of the second end of the camshaft 51 and the high-pressure pump 1 are unequal. When a position with a smaller distance between the circumferential surface of the second end of the camshaft 51 and the high-pressure pump 1 contacts the tappet 52, the tappet 52 can be made to push the piston of the high-pressure pump 1 to move, so that the fuel stored in the pump chamber of the high-pressure pump 1 is compressed into high-pressure fuel.

[0058] Regarding the structure of the second end of the camshaft 51, in some embodiments, the rotating disk includes two contact parts oppositely arranged in the radial direction. The distance between the contact part and the high-pressure pump 1 is less than the distance between other parts of the rotating disk except the contact part and the high-pressure pump 1. When the contact part contacts the bottom of the tappet 52, the fuel stored in the pump chamber of the high-pressure pump 1 is high-pressure fuel.

[0059] In this embodiment, the rotating disk can be similar to a peach tip structure, or in other words, the disk surface of the rotating disk is an elliptical surface, and the elliptical surface has a convex arc surface structure, and this convex arc surface structure forms the contact part of the rotating disk, so that the distance between the contact part and the high-pressure pump 1 is less than the distance between other parts of the rotating disk except the contact part and the high-pressure pump 1. When the contact part of the camshaft 51 contacts the tappet 52, the contact part can be made to push the tappet 52 to move in the direction close to the high-pressure pump 1, and further the tappet 52 is made to push the piston of the high-pressure pump 1 to move, so that the fuel stored in the pump chamber of the high-pressure pump 1 is compressed into high-pressure fuel. In this way, through the cooperation of the second end of the camshaft 51 and the tappet 52, the drive of the high-pressure pump 1 and the output of high-pressure fuel can be realized, making the entire high-pressure fuel output structure simple, the output of high-pressure fuel efficient, facilitating the installation of the fuel injection system, and being conducive to reducing the installation and preparation cost of the fuel injection system.

[0060] Regarding the fuel supply assembly 2, in some embodiments, the fuel supply assembly 2 includes a supply pipeline 21, a low-pressure pump 22, and a fuel storage tank 23; the low-pressure pump 22 includes a second inlet 221 and a second outlet 222. The second inlet 221 is communicated with the fuel storage tank 23 through the supply pipeline 21, and the second outlet 222 is communicated with the first inlet 11 through the supply pipeline 21.

[0061] In this embodiment, the supply pipeline 21 can be a multi-section pipeline, and the supply pipeline 21 is mainly used for fuel transportation. The low-pressure pump 22 mainly uses the rotation or reciprocating motion of moving components such as impellers or plungers to generate a certain kinetic energy, causing the fuel to generate pressure, thereby realizing fuel transportation. Thus, since the low-pressure pump 22 includes a second feed port 221 and a second discharge port 222, the second feed port 221 is connected to the fuel storage tank 23 through the supply pipeline, and the second discharge port 222 is connected to the first feed port 11 through the supply pipeline. Therefore, the stable input of fuel can be achieved through the low-pressure pump 22. It should be noted that the low-pressure pump 22 can be electrically connected to the power supply and system control cabinet 01, so that the feeding pressure can be switched between 4 bar and 6 bar.

[0062] In some embodiments, a control valve 7 and an external fuel supply component are further connected in the supply pipeline between the second discharge port 222 and the first feed port 11. The control valve 7 includes a first interface 71, a second interface 72, and a first outlet 73. The first interface 71 is connected to the second discharge port 222 through the supply pipeline 21, the second interface 72 is connected to the external fuel supply component, and the first outlet 73 is connected to the first feed port 11 through the supply pipeline 21. When the first interface 71 is closed, the second interface 72 is connected to the first outlet 73. When the second interface 72 is closed, the first interface 71 is connected to the first outlet 73.

[0063] In this embodiment, the control valve 7 can be any one of valves with two working inlets and one working outlet, such as a two-way one-way ball valve, a two-way one-way cock valve, a two-way one-way butterfly valve, etc. The embodiments of the present application do not limit this. Since the first interface 71 is connected to the second discharge port 222 through the supply pipeline 21, the second interface 72 is connected to the external fuel supply component, and the first outlet 73 is connected to the first feed port 11 through the supply pipeline 21. When the first interface 71 is closed, the second interface 72 is connected to the first outlet 73. When the second interface 72 is closed, the first interface 71 is connected to the first outlet 73. Therefore, the fuel injection system can have two different feeding methods. Thus, when internal feeding is required, the second interface 72 can be in a closed state, and the first interface 71 is connected to the first outlet 73, and then fuel is supplied through the fuel storage tank 23. When external feeding is required, the first interface 71 can be in a closed state, and the second interface 72 is connected to the first outlet 73, and then fuel is supplied through the external fuel supply component, enabling flexible switching between different feeding paths and making the fuel supply path of the fuel injection system unrestricted. It should be noted that taking the control valve 7 as a two-way one-way ball valve as an example, the low-pressure pump 22 and the two-way one-way ball valve can be connected by a clamp-fastened pagoda method, and the supply pipeline 21 of the external fuel supply component and the two-way one-way ball valve can also be connected by a clamp-fastened pagoda method.

[0064] In some embodiments, a pressure measurement and control assembly 8 is further connected in the supply pipeline 21 between the first outlet 73 and the first feed inlet 11; the pressure measurement and control assembly 8 includes a pressure regulating valve 81 and a pressure gauge 82. The pressure regulating valve 81 is arranged in the supply pipeline 21 between the first outlet 73 and the first feed inlet 11, and the pressure gauge 82 is arranged in the supply pipeline 21 between the pressure regulating valve 81 and the first feed inlet 11.

[0065] In this embodiment, by arranging the pressure regulating valve 81 in the supply pipeline 21 between the first outlet 73 and the first feed inlet 11, the fuel flow can be controlled by controlling the opening amount of the internal valve of the pressure regulating valve 81, so as to realize the regulation of the pressure in the low-pressure fuel supply pipe, and facilitate the regulation of the feeding pressure in the supply pipeline 21. The real-time feeding pressure in the supply pipeline 21 can be detected by the pressure gauge 82, which is used to control the feeding pressure in real time by the pressure valve, so that the whole feeding pressure is safe and controllable.

[0066] In some embodiments, the fuel storage tank 23 is provided with a heat exchange assembly 231; the heat exchange assembly 231 includes a temperature control pipeline which is wound around the inner wall of the fuel storage tank 23. The temperature control pipeline includes a medium inlet and a medium outlet. The medium inlet is used for inputting a heat exchange medium, and the medium outlet is used for outputting the heat exchange medium after heat exchange.

[0067] In this embodiment, since the temperature control pipeline is wound around the inner wall of the fuel storage tank 23, and the temperature control pipeline includes a medium inlet and a medium outlet, the medium inlet is used for inputting a heat exchange medium, and the medium outlet is used for outputting the heat exchange medium after heat exchange, the temperature of the fuel can be controlled through the heat exchange assembly 231, thereby expanding the diversity of fuel injection tests, reducing the limitation of fuel temperature on injection tests, and providing a condition guarantee for more in-depth injection tests.

[0068] In some embodiments, the installation cavity is a closed cavity, and a lubricating medium is filled in the installation cavity; the lubricating medium at least wets half of the diameter of the camshaft 51, and at the same time wets the connecting part between the second end of the camshaft 51 and the tappet 52.

[0069] In this embodiment, since the lubricating medium at least wets half of the diameter of the camshaft 51, and at the same time wets the connecting part between the second end of the camshaft 51 and the tappet 52, the smooth rotation of the rotating assembly 5 can be ensured through the lubricating medium, and the normal driving of the high-pressure pump 1 can be ensured.

[0070] In some embodiments, the injection assembly 3 includes a main injector 31, a sub-injector 32, and a pressure stabilizing chamber 33; the pressure stabilizing chamber 33 is communicated with the first discharge port 12; the main injector 31 includes a third feed port and a first injection end, the sub-injector 32 includes a fourth feed port and a second injection end, the third feed port and the fourth feed port are respectively communicated with the pressure stabilizing chamber 33, and the second injection end is communicated with the first feed port 11; when the first injection end is in the injection state, the second injection end is in the stopped working state, and when the first injection end is in the stopped working state, the second injection end is in the injection state.

[0071] In this embodiment, since the main injector 31 includes a third feed port and a first injection end, the sub-injector 32 includes a fourth feed port and a second injection end, the third feed port and the fourth feed port are respectively communicated with the pressure stabilizing chamber 33, and the second injection end is communicated with the first feed port 11, fuel with a stable pressure can be provided to the main injector 31 and the sub-injector 32 through the pressure stabilizing chamber 33, and the injection oil pressure can be provided to the high-pressure pump 1 through the sub-injector 32. Also, since when the first injection end is in the injection state, the second injection end is in the stopped working state, and when the first injection end is in the stopped working state, the second injection end is in the injection state, the sub-injector 32 can be in the working state when the fuel pressure is established to supply oil to the high-pressure pump 1 simultaneously with the fuel supply assembly to ensure that the system pressure fluctuation is as small as possible. When the main injector 31 needs to work, the sub-injector 32 can be switched to the stopped working state to ensure the stable supply pressure and also ensure the high-pressure fuel supply capacity under high-pressure injection and large injection pulse widths.

[0072] It should be noted that a one-way valve 02 can be provided between the pressure stabilizing chamber 33 and the first feed port 11, and thus the fuel flow direction between the sub-injector 32 and the high-pressure pump 1 can be limited through the one-way valve 02 to ensure that the sub-injector 32 can supply oil to the high-pressure pump 1 simultaneously with the fuel supply assembly.

[0073] In some embodiments, the injection assembly 3 further includes a detection module 9 and a controller 10; the detection module 9 further includes a pressure sensor 91, a high-pressure meter 92, and a temperature sensor 93. The pressure sensor 91 is installed inside the pressure stabilizing chamber 33, and the high-pressure meter 92 and the temperature sensor 93 are connected in the communication pipeline between the pressure stabilizing chamber 33 and the first injection end. The detection module 9, the main injector 31, and the sub-injector 32 are all electrically connected to the controller 10.

[0074] In this embodiment, when the main injector 31 operates, the high-pressure meter 92 can monitor and calculate the injection volume of the main injector 31 in real time, effectively measure the fuel consumption of the main injector 31 in a timely manner. At the same time, the configuration of the high-pressure meter 92 can meet the measurement of fuel consumption in a test bench without an oil consumption meter, enhancing the versatility of the fuel injection system during testing. Meanwhile, the temperature sensor 93 can feedback the fuel temperature in real time, which is beneficial for the fuel supply component to provide an appropriate fuel temperature. In addition, the pressure sensor 91 can detect the fuel supply pressure in the pressure stabilizing chamber 33 and feedback the fuel supply pressure to the controller 10, making the fuel supply pressure during the entire injection process safe and controllable.

[0075] In addition, since the detection module 9, the main injector 31, and the auxiliary injector 32 are all electrically connected to the controller 10, the controller 10 can not only control the detection of the detection module 9, but also realize the injection operations of the main injector 31 and the auxiliary injector 32 through the controller 10. Furthermore, the drive current curve can be changed according to different types of injectors and the trigger working mode can be adjusted. The trigger working mode can include an internal trigger mode and an external trigger mode. Among them, the internal trigger mode can be understood as the working module triggered by the test device of the fuel injection system, while the external trigger mode can be understood as the working mode triggered by the engine, making the injection trigger modes of the injector and the auxiliary injector 32 unrestricted.

[0076] In some embodiments, the injection assembly 3 further includes a first mounting member 34 and a second mounting member; the main injector 31 is mounted on the first component through the first mounting member 34. The first mounting member 34 includes a first pressing block 341 and a second pressing block 342 arranged at intervals, and the main injector 31 is mounted between the first pressing block 341 and the second pressing block 342. Among them, the first component includes an engine and a test device; the auxiliary injector 32 is mounted on the pressure stabilizing chamber 33 through the second mounting member. The second mounting member includes a third pressing block and a fourth pressing block arranged at intervals, and the auxiliary injector 32 is mounted between the third pressing block and the fourth pressing block.

[0077] In this embodiment, since the main injector 31 is mounted on the first component through the first mounting member 34. The first mounting member 34 includes a first pressing block 341 and a second pressing block 342 arranged at intervals, and the main injector 31 is mounted between the first pressing block 341 and the second pressing block 342. Among them, the first component includes an engine and a test device; the auxiliary injector 32 is mounted on the pressure stabilizing chamber 33 through the second mounting member. The second mounting member includes a third pressing block and a fourth pressing block arranged at intervals, and the auxiliary injector 32 is mounted between the third pressing block and the fourth pressing block. Therefore, each component of the injection assembly 3 is detachable. When any component of the injection assembly 3 is damaged, it is convenient for replacement and repair. Coupled with the detachable connection between the aforementioned high-pressure pump 1, the motor 4, the rotating assembly 5, and the mounting seat 6, the maintenance cost and repair cycle of the fuel injection system are greatly reduced.

[0078] In addition, it should be noted that in the embodiments of the present application, Figure 1 the solid arrows in represent the flow path of the fuel in the supply pipeline 21, Figure 1 the dashed arrows in represent the flow path of the heat medium in the temperature control pipeline, Figure 1 the dashed lines without arrows in represent the communication and power supply lines.

[0079] Next, the working process of the fuel injection system provided by the embodiments of the present application will be specifically introduced as follows:

[0080] Each component of the fuel injection system can collect and detect the module 9 by the control main board and output target variable values such as the supply pressure target value and the fuel temperature value. After inputting the fuel temperature value, the control main board controls the heat exchange component 231 in the fuel storage tank 23 according to the fuel temperature value to adjust the supply temperature. After the low-pressure pump 22 is powered on, it conveys the fuel in the fuel storage tank 23 to the high-pressure pump 1. After starting the motor 4, the motor 4 drives the camshaft 51 to rotate through the drive, and the drive camshaft 51 drives the tappet 52 to move through the second end, so that the tappet 52 pushes the piston of the high-pressure pump 1 to move, so that the fuel stored in the pump chamber of the high-pressure pump 1 is compressed into high-pressure fuel, and the high-pressure fuel is transported through the first discharge port 12 to the pressure stabilizing chamber 33. The pressure sensor 91 installed on the pressure stabilizing chamber 33 feeds back its internal pressure to the automatic control unit, and the automatic control unit performs closed-loop regulation on the oil supply pressure in the high-pressure pump 1 according to the feedback pressure to reach the set target pressure. The controller 10 sets parameters such as the working current curve, injection pulse width, injection frequency, and internal and external trigger modes according to the test requirements. When the fuel pressure is established, the sub-injector 32 can be in a working state to supply oil to the high-pressure pump 1 simultaneously with the oil supply component to ensure that the system pressure fluctuation is as small as possible. When the main injector 31 needs to work, the sub-injector 32 can be switched to stop working to ensure the stability of the supply pressure and also ensure the high-pressure fuel supply capacity under high-pressure injection and large injection pulse widths.

[0081] In summary, the fuel injection system provided by the embodiments of the present application has at least the following beneficial effects:

[0082] 1. The fuel injection system provided by the embodiments of the present application can not only perform relevant fuel injection characteristic tests independently of the engine as a fuel injection system, but also, due to the detachable nature of the high-pressure pump 1 and its adaptability to high-pressure pumps 1 of different models, different displacements, and different fuels used, it can meet different fuel injection characteristic tests, thereby reducing the manufacturing cost of the fuel injection system, reducing the test cost of fuel injection characteristic tests, and improving the test efficiency.

[0083] 2. The assembly between the components of the fuel injection system is simple, easy to disassemble and assemble, and can be repaired or replaced in a timely manner when each component is damaged, reducing the maintenance cost and the maintenance cycle.

[0084] 3. The fuel with a stable pressure can be supplied to the main injector 31 and the auxiliary injector through the pressure stabilizing chamber 33, and the injection oil pressure can be supplied to the high-pressure pump 1 through the auxiliary injector 32. Also, since the second injection end is in a stopped working state when the first injection end is in an injection state, and the second injection end is in an injection state when the first injection end is in a stopped working state, the auxiliary injector 32 can be in a working state during the establishment of the fuel pressure to supply oil to the high-pressure pump 1 simultaneously with the fuel supply assembly, so as to ensure that the system pressure fluctuation is as small as possible. When the main injector 31 needs to work, it can be switched to the auxiliary injector 32 to stop working, so as to ensure the stability of the supply pressure and also ensure the high-pressure fuel supply capacity under high-pressure injection and large injection pulse widths.

[0085] 4. The controllability of the fuel temperature can be achieved through the heat exchange assembly 231, thereby expanding the diversity of fuel injection tests, reducing the limitations of fuel temperature on injection tests, and providing a condition guarantee for more in-depth injection tests.

[0086] The embodiments in the specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0087] Although the preferred embodiments of the embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0088] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or terminal device including the said element.

[0089] The above has introduced this application in detail. Specific examples are used in this text to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, according to the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on this application.

Claims

1. A fuel injection system, characterized in that, Comprising: A high-pressure pump, a fuel supply assembly, and an injection assembly. The high-pressure pump includes a first inlet and a first outlet. The first inlet is connected to the fuel supply assembly, and the first outlet is connected to the injection assembly. A motor and a rotating assembly. The rotating assembly includes a camshaft and a tappet. The first end of the camshaft is connected to the motor, and the second end of the camshaft is movably connected to the high-pressure pump through the tappet. When the motor rotates, the second end of the camshaft drives the tappet to move, so that the fuel stored in the pump chamber of the high-pressure pump becomes high-pressure fuel. A mounting seat. The mounting seat includes a mounting cavity. The second end of the camshaft and the tappet are installed in the mounting cavity, and the high-pressure pump is detachably connected to the mounting seat.

2. The fuel injection system according to claim 1, characterized in that, The second end of the camshaft includes a rotating disk. The rotating disk includes two contact parts oppositely arranged in the radial direction. The distance between the contact part and the high-pressure pump is less than the distance between other parts of the rotating disk except the contact part and the high-pressure pump. When the contact part contacts the bottom of the tappet, the fuel stored in the pump chamber of the high-pressure pump is high-pressure fuel.

3. The fuel injection system according to claim 1, wherein The fuel supply assembly includes a supply pipeline, a low-pressure pump, and a fuel storage tank. The low-pressure pump includes a second inlet and a second outlet. The second inlet is communicated with the fuel storage tank through the supply pipeline, and the second outlet is communicated with the first inlet through the supply pipeline.

4. The fuel injection system according to claim 3, characterized in that, A control valve and an external fuel supply assembly are also connected in the supply pipeline between the second outlet and the first inlet. The control valve includes a first interface, a second interface, and a first outlet. The first interface is communicated with the second outlet through the supply pipeline, the second interface is connected to the external fuel supply assembly, and the first outlet is communicated with the first inlet through the supply pipeline. When the first interface is closed, the second interface is communicated with the first outlet. When the second interface is closed, the first interface is communicated with the first outlet.

5. The fuel injection system according to claim 4, characterized in that, A pressure measurement and control assembly is also connected in the supply pipeline between the first outlet and the first inlet. The pressure measurement and control assembly includes a pressure regulating valve and a pressure gauge. The pressure regulating valve is arranged in the supply pipeline between the first outlet and the first inlet, and the pressure gauge is arranged in the supply pipeline between the pressure regulating valve and the first inlet.

6. The fuel injection system according to claim 3, characterized in that, The fuel storage tank is provided with a heat exchange assembly. The heat exchange assembly includes a temperature control pipeline. The temperature control pipeline is wound around the inner wall of the fuel storage tank. The temperature control pipeline includes a medium inlet and a medium outlet. The medium inlet is used for inputting a heat exchange medium, and the medium outlet is used for outputting the heat exchange medium after heat exchange.

7. The fuel injection system according to claim 1, characterized in that, The mounting cavity is a closed cavity, and a lubricating medium is filled in the mounting cavity. The lubricating medium at least wets half of the diameter of the camshaft and simultaneously wets the connecting part between the second end of the camshaft and the tappet.

8. The fuel injection system according to claim 1, characterized in that, The injection assembly includes a main injector, a sub-injector, and a pressure stabilizing chamber. The pressure stabilizing chamber is communicated with the first outlet. The main injector includes a third feed inlet and a first injection end, the auxiliary injector includes a fourth feed inlet and a second injection end, the third feed inlet and the fourth feed inlet are respectively communicated with the pressure stabilizing chamber, and the second injection end is communicated with the first feed inlet; When the first injection end is in the injection state, the second injection end is in the stopped working state, and when the first injection end is in the stopped working state, the second injection end is in the injection state.

9. The fuel injection system according to claim 8, characterized in that, The injection assembly further includes a detection module and a controller; The detection module further includes a pressure sensor, a high-pressure meter and a temperature sensor. The pressure sensor is installed inside the pressure stabilizing chamber, and the high-pressure meter and the temperature sensor are connected in the communication pipeline between the pressure stabilizing chamber and the first injection end; The detection module, the main injector and the auxiliary injector are all electrically connected to the controller.

10. The fuel injection system according to claim 8, characterized in that, The injection assembly further includes a first mounting member and a second mounting member; The main injector is mounted on a first component through the first mounting member. The first mounting member includes a first pressing block and a second pressing block arranged at intervals, and the main injector is mounted between the first pressing block and the second pressing block. Among them, the first component includes an engine and a test device; The auxiliary injector is mounted on the pressure stabilizing chamber through the second mounting member. The second mounting member includes a third pressing block and a fourth pressing block arranged at intervals, and the auxiliary injector is mounted between the third pressing block and the fourth pressing block.

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