Common rail pump test bench

Abstract

The invention discloses a common rail pump test bed which comprises a fuel oil supply system, an engine oil supply system, a cooling system, a driving mechanism, a fuel oil injection system and an oil return system. The fuel oil supply system is connected with the common rail pump through a pipeline and provides clean fuel oil for the common rail pump. The engine oil supply system is connected with the common rail pump through a pipeline and provides cleaning engine oil for the common rail pump. The cooling system comprises a fuel oil cooling system and an engine oil cooling system which are respectively used for cooling high-temperature fuel oil and high-temperature engine oil; the driving mechanism is connected with the common rail pump and controls the common rail pump to spray out fuel oil; the fuel injection system is used for receiving fuel injected by the common rail pump and measuring fuel injection parameters; and the oil return system is used for recovering fuel oil and engine oil in the working process of the common rail pump to realize reutilization, and the common rail pump test bed can be used for testing a high-pressure common rail system, so that faults of the common rail system are diagnosed and analyzed, and the research and development efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of diesel engine exhaust aftertreatment technology, specifically a common rail pump test bench. Background Technology

[0002] With increasingly stringent emission regulations and continuous advancements in diesel engine electronic control technology, the high-pressure common rail fuel injection system, as a highly flexible fuel injection system, has become a trend in modern diesel engine technology development due to its significant advantages.

[0003] Currently, common rail pumps have a relatively high failure rate during use, and fault diagnosis takes a long time, which affects the performance development of common rail pumps, causes resource waste, and reduces R&D efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a common rail pump test bench that can test high-pressure common rail systems, thereby diagnosing and analyzing common rail system faults, which is conducive to improving R&D efficiency and can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a common rail pump test bench, comprising a fuel supply system, an oil supply system, a cooling system, a drive mechanism, a fuel injection system, and a return oil system;

[0006] The fuel supply system is connected to the common rail pump via pipelines to provide clean fuel to the common rail pump.

[0007] The oil supply system is connected to the common rail pump via pipelines to provide clean oil to the common rail pump.

[0008] The cooling system includes a fuel cooling system and an oil cooling system, which cool the high-temperature fuel and the high-temperature oil respectively.

[0009] A drive mechanism is connected to the common rail pump to control the common rail pump to inject fuel.

[0010] The fuel injection system is used to receive fuel injected by the common rail pump and to measure the injection parameters;

[0011] The oil return system is used to recover fuel and engine oil generated during the operation of the common rail pump, enabling their reuse.

[0012] As a preferred embodiment of the present invention, the fuel supply system includes a fuel return tank and a fuel inlet tank. A fuel coarse filter is installed in the fuel inlet tank and connected to a fuel pump through a pipeline. The fuel pump is connected to a common rail pump through a fuel inlet pipe. A fuel fine filter and a pressure regulating valve II are installed on the fuel inlet pipe.

[0013] The fuel return tank is equipped with a heating pipe II for heating the fuel.

[0014] As a preferred embodiment of the present invention, a temperature sensor I and a level sensor I are provided in the fuel return tank, a temperature sensor II and a level sensor II are provided in the fuel inlet tank, and a temperature sensor VI and a pressure sensor II are installed on the fuel inlet pipe near the fuel inlet of the common rail pump.

[0015] As a preferred embodiment of the present invention, the oil supply system includes an oil return tank and an oil inlet tank. An oil coarse filter is installed in the oil inlet tank and connected to the oil pump through a pipeline. The oil pump is connected to the common rail pump through an oil inlet pipe. An oil fine filter and a pressure regulating valve I are installed on the oil inlet pipe.

[0016] The oil return tank is equipped with a heating tube I for heating the oil.

[0017] As a preferred embodiment of the present invention, a temperature sensor III and a level sensor III are provided in the oil return tank, a temperature sensor IV and a level sensor IV are provided in the oil inlet tank, and a temperature sensor V and a pressure sensor I are installed on the oil inlet pipe near the oil inlet of the common rail pump.

[0018] As a preferred embodiment of the present invention, the fuel cooling system includes a fuel supply pump, a fuel cooler, and a water inlet pipe II. A fuel filter is installed in the fuel return tank and is connected to the inlet of the fuel supply pump through a pipeline. The outlet of the fuel supply pump is connected to the fuel cooler through a pipeline. The outlet end of the fuel cooler is provided with a water return pipe II and a connecting oil pipe. The water return pipe II is connected to a recovery tank, and the connecting oil pipe is connected to the fuel inlet tank.

[0019] The water inlet pipe II is connected to the inlet end of the fuel cooler. The water inlet pipe II is equipped with a filter II and a proportional solenoid valve II. The output pipe of the fuel supply pump is equipped with a flow regulating valve II.

[0020] The oil cooling system includes an oil supply pump, an oil cooler, and an inlet pipe I. An oil filter is installed in the oil return tank and is connected to the inlet of the oil supply pump through a pipeline. The outlet of the oil supply pump is connected to the oil cooler through a pipeline. The outlet end of the oil cooler is provided with a return pipe I and a connecting pipe. The return pipe I is connected to the recovery tank, and the connecting pipe is connected to the oil inlet tank.

[0021] The water inlet pipe I is connected to the inlet end of the oil cooler. The water inlet pipe I is equipped with a filter I and a proportional solenoid valve I. The output pipe of the oil supply pump is equipped with a flow regulating valve I.

[0022] As a preferred embodiment of the present invention, the drive mechanism includes a pump bed, a guide rail, and a drive motor. The guide rail is mounted on the pump bed, the common rail pump is mounted on the guide rail, and the common rail pump is connected to the drive motor via a coupling. The drive motor drives the common rail pump to work.

[0023] As a preferred embodiment of the present invention, the fuel injection system includes a rail, high-pressure fuel lines, injectors, and fuel atomizers. The common rail pump is connected to the rail via a fuel line. A temperature sensor VIII and a pressure sensor IV are installed on the fuel line. A rail pressure sensor is installed at one end of the rail, and the output of the rail pressure sensor is connected to a controller. A pressure regulating valve is provided at the other end of the rail. Multiple high-pressure fuel lines are provided on the rail. The high-pressure fuel lines are connected to the injectors. The injectors are connected to the fuel atomizers. The bottom of the fuel atomizers is connected to a flow meter III, and the flow meter III is connected to a mobile flow meter trolley.

[0024] As a preferred embodiment of the present invention, the oil return system includes an oil collection tank, the oil return port of the injector is connected to the oil return pipe of the injector, a pressure relief pipe is installed on the rail, a pressure relief valve is provided on the pressure relief pipe, and the pipelines containing the mobile flow meter trolley, the oil return pipe of the injector, the pressure relief pipe and the pressure regulating valve are all connected to the inlet of the oil collection tank, and the other end of the oil collection tank is connected to the fuel return tank through the oil return pipe;

[0025] The common rail pump is connected to the inlet of the fuel tank via a fuel return pipe. A pressure sensor III, a temperature sensor VII, a proportional solenoid valve III, and a flow meter II are sequentially installed on the fuel return pipe. A branch pipe is installed on the fuel return pipe, which is connected to the return port of the common rail pump. A flow meter I is installed on the branch pipe.

[0026] The other end of the common rail pump is connected to the inside of the oil return tank via an oil return pipe.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: This common rail pump test bench can conduct platform performance and reliability tests on high-power common rail system assemblies and individual components. It can complete the measurement tests of key parameters such as diesel engine common rail system matching, rail pressure control strategy optimization, and injection pattern and injection quantity. At the same time, the common rail pump test bench can be used to diagnose and analyze common rail system faults in the development and testing process of new diesel engines, providing strong support for the optimization and improvement of overall engine performance. It is also conducive to improving R&D efficiency, shortening the overall engine development cycle, and reducing the waste of test resources. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention.

[0029] In the diagram: 1. Mobile flow meter trolley; 2. Oil collection tank; 3. Oil return pipe; 4. Temperature sensor I; 5. Liquid level sensor I; 6. Fuel return tank; 7. Fuel filter; 8. Connecting oil pipe; 9. Fuel coarse filter; 10. Temperature sensor II; 11. Liquid level sensor II; 12. Fuel inlet tank; 13. Temperature sensor III; 14. Liquid level sensor III; 15. Oil return pipe; 16. Heating pipe I; 17. Flow control valve I; 18. Oil filter; 19. Oil supply pump; 20. Oil return tank; 21. Oil inlet tank; 22. Oil coarse filter; 23. Temperature sensor IV; 24. Liquid level sensor IV; 25. Oil pump; 26. Oil fine filter; 27. Pressure control valve I; 28. Temperature sensor V; 29. ​​Pressure sensor I; 30. Oil cooler; 31. Water return pipe I; 32. Proportional solenoid valve I; 33. Filter I; 34. Water inlet pipe I; 35. Heating pipe II; 36. Flow control valve II, 37 Fuel Supply Pump, 38 Fuel Pump, 39 Fuel Inlet Pipe, 40 Water Return Pipe II, 41 Fuel Cooler, 42 Water Inlet Pipe II, 43 Filter II, 44 Proportional Solenoid Valve II, 45 Fuel Fine Filter, 46 Pressure Regulating Valve II, 47 Temperature Sensor VI, 48 Pressure Sensor II, 49 Guide Rail, 50 Common Rail Pump, 51 Coupling, 52 Pump Bed, 53 Drive Motor, 54 Fuel Return Pipe, 55 Pressure Sensor III, 56 Temperature Sensor VII, 57 Flow Meter I, 58 Proportional Solenoid Valve III, 59 Flow Meter II, 60 Fuel Pipe, 61 Temperature Sensor VIII, 62 Pressure Sensor IV, 63 Rail, 64 Pressure Relief Valve, 65 Pressure Relief Pipe, 66 Rail Pressure Sensor, 67 Controller, 68 High-Pressure Oil Pipe, 69 Injector, 70 Injector Atomizer, 71 Pressure Regulating Valve, 72 Injector Return Pipe, 73 Flow Meter III. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1 The present invention provides a technical solution: a common rail pump test bench, comprising a fuel supply system, an oil supply system, a cooling system, a drive mechanism, a fuel injection system and a return oil system;

[0032] The fuel supply system mainly provides clean fuel to the common rail pump 50. The fuel tank, as a fuel storage device, is divided into a fuel return tank 6 and a fuel inlet tank 12. The fuel return tank 6 mainly receives fuel return, which is relatively dirty, so it is stored separately from the fuel inlet tank 12. A temperature sensor I 4 and a level sensor I 5 are installed in the fuel return tank 6 to detect the fuel temperature and the fuel level in the tank and provide timely feedback.

[0033] The fuel return tank 6 contains a heating tube II 35 for heating the fuel. The heating tube II 35 heats the fuel according to the set temperature and the feedback fuel temperature.

[0034] The fuel stored in the fuel tank 12 is directly supplied to the common rail pump 50. Temperature sensor II 10 and level sensor II 11 are installed in the fuel tank 12 to detect the fuel temperature and fuel level and provide timely feedback. The fuel pump 38 draws fuel from the fuel tank 12. The fuel is filtered through the fuel coarse filter 9 and enters the fuel fine filter 45 through the fuel inlet pipe 39 for secondary filtration.

[0035] To ensure that the fuel system simulates the engine as closely as possible, the fuel pressure can be adjusted according to actual needs. A pressure regulating valve II46 is installed on the fuel inlet pipe 39 to adjust the fuel inlet pressure. A temperature sensor VI 47 and a pressure sensor II 48 are installed near the fuel inlet of the common rail pump 50 to detect the fuel inlet pump temperature and pressure.

[0036] The oil supply system mainly provides clean oil to the common rail pump 50. The oil tank, as a device for storing oil, is divided into an oil return tank 20 and an oil inlet tank 21. The oil return tank 20 mainly receives returned oil, which is relatively dirty, so it is stored separately from the oil inlet tank 21. Temperature sensor III 13 and level sensor III 14 are installed in the oil return tank 20 to detect the oil temperature and oil level in the tank and provide timely feedback.

[0037] The oil return tank 20 contains a heating element I16 for heating the oil. The heating element I16 heats the oil according to the set temperature and the feedback oil temperature. The oil stored in the oil inlet tank 21 is directly supplied to the common rail pump 50. The oil inlet tank 21 is equipped with a temperature sensor IV 23 and a level sensor IV 24 for detecting the oil temperature and oil level and providing timely feedback.

[0038] The oil pump 25 draws oil from the oil tank 21. The oil is filtered through the coarse oil filter 22 and then enters the fine oil filter 26 through the oil inlet pipe for secondary filtration. To ensure that the oil system is as close as possible to the engine, the oil pressure can be adjusted according to actual needs. A pressure regulating valve I 27 is installed on the oil inlet pipe to adjust the oil inlet pressure. A temperature sensor V28 and a pressure sensor I29 are installed near the oil inlet of the common rail pump 50 to detect the oil inlet pump temperature and pressure.

[0039] The cooling system is used to cool fuel and engine oil, and is divided into a fuel cooling system and an engine oil cooling system. The cooling medium of the cooling system is cooling water.

[0040] Cooling water from the fuel cooling system enters through inlet pipe II42, passes through filter II43, and enters proportional solenoid valve II44. Filter II43 filters impurities from the cooling water. Proportional solenoid valve II44 controls the flow rate of cooling water by adjusting the valve opening, thereby controlling the fuel cooling efficiency. Cooling water cools the fuel in fuel cooler 41. The fuel in fuel return tank 6 has a higher temperature and more impurities. Therefore, fuel supply pump 37 filters the fuel in fuel return tank 6 through fuel filter 7 and cools it through fuel cooler 41, and then enters fuel inlet tank 12 through connecting fuel pipe 8.

[0041] To prevent fuel level alarms in the fuel return tank 6 and fuel inlet tank 12, a flow regulating valve II 36 is installed on the fuel supply pump 37 to control the fuel flow from the fuel return tank 6 to the fuel inlet tank 12.

[0042] Cooling water from the oil cooling system enters through inlet pipe I 34, passes through filter I 33, and enters proportional solenoid valve I 32. Filter I 33 filters impurities from the cooling water. Proportional solenoid valve I 32 controls the flow rate of cooling water by adjusting the valve opening, thereby controlling the cooling efficiency of the oil. Cooling water cools the oil in oil cooler 30. The oil temperature in oil return tank 20 is high and contains more impurities. Therefore, oil supply pump 19 pumps the oil in oil return tank 20 through oil filter 18 and oil cooler 30, and then through connecting pipe into oil inlet tank 21.

[0043] To prevent oil level alarms in the oil return tank 20 and oil inlet tank 21, a flow regulating valve I 17 is installed on the oil supply pump 19 to control the oil flow from the oil return tank 20 to the oil inlet tank 21.

[0044] The drive mechanism includes a pump bed 52, a guide rail 49, and a drive motor 53. The pump bed 52 serves as the main support for the common rail pump test bench. The guide rail 49 is mounted on the pump bed 52, and the common rail pump 50 is mounted on the guide rail 49 and fixed with bolts.

[0045] The common rail pump 50, injector 69, and rail 63 are the core components of the common rail system, and there are many types and models of them. In order to enable performance tests of various types of common rail pumps 50, injectors 69, and rails 63 on the pump bed 52, the installation fixtures for common rail pumps 50, injectors 69, and rails 63 are made into universal types. Multiple types of common rail pumps 50, injectors 69, and rails 63 can be installed on the pump bed 52, saving manpower and resources and improving testing efficiency. At the same time, a single injection measuring instrument and oscilloscope are connected to the common rail pump test bench to measure the single injection quantity and injection pattern of the common rail system. The coupling 51 connects the common rail pump 50 and the drive motor 53 together. When the drive motor 53 rotates, it drives the common rail pump 50 to rotate together.

[0046] The fuel injection system is a key component of the common rail pump test bench. Fuel injected by the common rail pump 50 enters the rail 63 through the fuel pipe 60. Temperature sensor VIII 61 and pressure sensor IV 62 are installed on the fuel pipe 60 to detect the temperature and pressure of the fuel exiting the pump. The function of the rail 63 is to provide a pressure vessel for the high-pressure fuel. A rail pressure sensor 66 is installed at one end of the rail 63 to detect the pressure inside the rail 63 and to feed the rail pressure back to the controller 67 in a timely manner. Based on the set rail pressure and the actual rail pressure, the rail pressure is adjusted through the pressure regulating valve 71. The controller 67 is the core component of the common rail system. The parameters of the common rail pump 50, the rail 63, and the injector 69 are all collected in the controller 67, and the parameters of the entire common rail system are adjusted through the controller 67.

[0047] The controller 67 is replaceable. Depending on the type of common rail system, the corresponding controller 67 is connected. The rail 63 and the injector 69 are connected through the high-pressure oil pipe 68. The injector 69 nozzle is installed in the injector atomizer 70. The injector atomizer 70 has a return oil hole at the bottom. The fuel sprayed by the injector 69 is passed through the flow meter 73 and enters the mobile flow meter trolley 1 through the pipeline. The injector atomizer 70 is a transparent container, which can directly observe and record the atomization effect of the injector 69.

[0048] The oil return system mainly consists of the oil return parts for fuel and engine oil. The engine oil returns directly to the oil return tank 20. The fuel from the mobile flow meter trolley 1 passes through the oil collection tank 2 and then through the return pipe 3 back to the fuel return tank 6. The return oil from the injector 69 enters the oil collection tank 2 through the injector return pipe 72 and returns to the fuel return tank 6.

[0049] A pressure relief pipe 65 is installed between the rail 63 and the oil collection tank 2. A pressure relief valve 64 is installed on the pressure relief pipe 65 to prevent the pressure inside the rail 63 from continuously increasing. After the pressure relief valve 64 is opened, the fuel returns to the fuel return tank 6 through the oil collection tank 2.

[0050] The return fuel from the common rail pump 50 is divided into two parts. One part is connected to the common rail pump 50 through a branch pipe, on which a flow meter I 57 is installed. The fuel returns to the common rail pump 50 through the flow meter I 57. The other part is connected to the fuel tank 2 through the fuel return pipe 54. The fuel return pipe 54 is equipped with a pressure sensor III 55, a temperature sensor VII 56, a proportional solenoid valve III 58, and a flow meter II 59. The fuel from the common rail pump 50 returns to the fuel return tank 6 through the fuel tank 2 via the proportional solenoid valve III 58 and the flow meter II 59. The function of the proportional solenoid valve III 58 is to control the amount of fuel returned by controlling its opening. The temperature sensor 56 and the pressure sensor 55 are installed on the fuel return pipe 54 to detect the temperature and pressure of the fuel return.

[0051] The other end of the common rail pump 50 is connected to the inside of the oil return tank 20 through the oil return pipe 15.

[0052] This invention can complete the matching of diesel engine common rail systems, optimization of rail pressure control strategies, and measurement and testing of key parameters such as injection patterns and injection quantities, thereby reducing the failure rate of high-pressure common rail systems, improving R&D efficiency, and reducing R&D costs.

[0053] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A common rail pump test bench, characterized in that: This includes the fuel supply system, oil supply system, cooling system, drive mechanism, fuel injection system, and oil return system; The fuel supply system is connected to the common rail pump (50) via a pipeline to provide clean fuel to the common rail pump (50); The oil supply system is connected to the common rail pump (50) via a pipeline to provide clean oil to the common rail pump (50); The cooling system includes a fuel cooling system and an oil cooling system, which cool the high-temperature fuel and the high-temperature oil respectively. The drive mechanism is connected to the common rail pump (50) and controls the common rail pump (50) to inject fuel. A fuel injection system for receiving fuel injected by a common rail pump (50) and measuring injection parameters; The oil return system is used to recover fuel and engine oil during the operation of the common rail pump (50) and reuse them.

2. The common rail pump test bench according to claim 1, characterized in that: The fuel supply system includes a fuel return tank (6) and a fuel inlet tank (12). A fuel coarse filter (9) is installed in the fuel inlet tank (12) and is connected to a fuel pump (38) through a pipeline. The fuel pump (38) is connected to the common rail pump (50) through a fuel inlet pipe (39). A fuel fine filter (45) and a pressure regulating valve II (46) are installed on the fuel inlet pipe (39). The fuel return tank (6) is equipped with a heating pipe II (35) for heating the fuel.

3. The common rail pump test bench according to claim 2, characterized in that: Temperature sensor I (4) and level sensor I (5) are installed in the fuel return tank (6), temperature sensor II (10) and level sensor II (11) are installed in the fuel inlet tank (12), and temperature sensor VI (47) and pressure sensor II (48) are installed on the fuel inlet pipe (39) near the fuel inlet of the common rail pump (50).

4. The common rail pump test bench according to claim 1, characterized in that: The oil supply system includes an oil return tank (20) and an oil inlet tank (21). An oil coarse filter (22) is installed in the oil inlet tank (21) and connected to the oil pump (25) through a pipeline. The oil pump (25) is connected to the common rail pump (50) through an oil inlet pipe. An oil fine filter (26) and a pressure regulating valve I (27) are installed on the oil inlet pipe. The oil return tank (20) is equipped with a heating pipe I (16) for heating the oil.

5. A common rail pump test bench according to claim 4, characterized in that: Temperature sensor III (13) and level sensor III (14) are installed in the oil return tank (20). Temperature sensor IV (23) and level sensor IV (24) are installed in the oil inlet tank (21). Temperature sensor V (28) and pressure sensor I (29) are installed on the oil inlet pipe near the oil inlet of the common rail pump (50).

6. A common rail pump test bench according to claim 2, characterized in that: The fuel cooling system includes a fuel supply pump (37), a fuel cooler (41), and a water inlet pipe II (42). A fuel filter (7) is installed in the fuel return tank (6) and is connected to the inlet of the fuel supply pump (37) through a pipeline. The outlet of the fuel supply pump (37) is connected to the fuel cooler (41) through a pipeline. The outlet end of the fuel cooler (41) is provided with a water return pipe II (40) and a connecting oil pipe (8). The water return pipe II (40) is connected to the recovery tank, and the connecting oil pipe (8) is connected to the fuel inlet tank (12). The water inlet pipe II (42) is connected to the inlet end of the fuel cooler (41). The water inlet pipe II (42) is equipped with a filter II (43) and a proportional solenoid valve II (44). The output pipe of the fuel supply pump (37) is equipped with a flow regulating valve II (36). The oil cooling system includes an oil supply pump (19), an oil cooler (30), and a water inlet pipe I (34). An oil filter (18) is installed in the oil return tank (20) and is connected to the inlet of the oil supply pump (19) through a pipeline. The outlet of the oil supply pump (19) is connected to the oil cooler (30) through a pipeline. The outlet end of the oil cooler (30) is provided with a water return pipe I (31) and a connecting pipe. The water return pipe I (31) is connected to the recovery tank, and the connecting pipe is connected to the oil inlet tank (21). The water inlet pipe I (34) is connected to the inlet end of the oil cooler (30). The water inlet pipe I (34) is equipped with a filter I (33) and a proportional solenoid valve I (32). The output pipe of the oil supply pump (19) is equipped with a flow regulating valve I (17).

7. A common rail pump test bench according to claim 1, characterized in that: The drive mechanism includes a pump bed (52), a guide rail (49), and a drive motor (53). The guide rail (49) is mounted on the pump bed (52), and the common rail pump (50) is mounted on the guide rail (49). The common rail pump (50) and the drive motor (53) are connected by a coupling (51). The drive motor (53) drives the common rail pump (50) to work.

8. A common rail pump test bench according to claim 4, characterized in that: The fuel injection system includes a rail (63), a high-pressure fuel line (68), an injector (69), and a fuel atomizer (70). The common rail pump (50) is connected to the rail (63) via the fuel line (60). A temperature sensor VIII (61) and a pressure sensor IV (62) are installed on the fuel line (60). A rail pressure sensor (66) is installed at one end of the rail (63). The output end of the rail pressure sensor (66) is connected to a controller (67). A pressure regulating valve (71) is provided at the other end of the rail (63). Multiple high-pressure fuel lines (68) are provided on the rail (63). The high-pressure fuel lines (68) are connected to the injector (69). The injector (69) is connected to the fuel atomizer (70). The bottom of the fuel atomizer (70) is connected to a flow meter III (73). The flow meter III (73) is connected to a mobile flow meter trolley (1).

9. A common rail pump test bench according to claim 8, characterized in that: The oil return system includes an oil collection tank (2), the oil return port of the injector (69) is connected to the injector oil return pipe (72), a pressure relief pipe (65) is installed on the rail (63), a pressure relief valve (64) is provided on the pressure relief pipe (65), the pipelines of the mobile flow meter trolley (1), the injector oil return pipe (72), the pressure relief pipe (65) and the pressure regulating valve (71) are all connected to the inlet of the oil collection tank (2), and the other end of the oil collection tank (2) is connected to the fuel return tank (6) through the oil return pipe (3); The common rail pump (50) is connected to the inlet of the oil collection tank (2) through the fuel return pipe (54). The fuel return pipe (54) is equipped with a pressure sensor III (55), a temperature sensor VII (56), a proportional solenoid valve III (58), and a flow meter II (59) in sequence. A branch pipe is provided on the fuel return pipe (54), which is connected to the return port of the common rail pump (50). A flow meter I (57) is provided on the branch pipe. The other end of the common rail pump (50) is connected to the inside of the oil return tank (20) via the oil return pipe (15).

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