A high-pressure common rail system for measuring injection volume of an injection valve

Abstract

This invention relates to a high-pressure common rail system for a test bench for measuring injection volume of an injection valve, belonging to the field of power machinery technology. It includes an injection volume measurement module, a fuel storage and pumping circulation module, a high-pressure common rail module, a servo oil storage and pumping module, and a servo oil cooling module. The injection volume measurement module includes a test bench, a fuel injector, a booster piston, and a two-position three-way valve. The low-pressure chamber of the booster piston and the test bench are connected to the fuel storage and pumping circulation module. The two-position three-way valve is also connected to a third servo oil tank and the high-pressure common rail module. The high-pressure common rail module includes a high-pressure common rail connected to the two-position three-way valve. One end of the high-pressure common rail is connected to the servo oil storage and pumping module, and the other end is connected to two servo oil tanks. This invention can adjust the high-pressure servo oil consumption to make the test bench conditions closer to the machine environment, extend the servo oil usage time, delay servo oil deterioration, and reduce contaminants in the test system.

Description

Technical Field

[0001] This invention relates to a high-pressure common rail system for a test bench that meets the requirements for measuring the injection quantity of an injection valve, specifically to a fuel injection quantity measuring device for reciprocating power machinery, belonging to the field of power machinery technology, and particularly in the application field of high-power two-stroke marine engines. Background Technology

[0002] In high-power marine two-stroke engines, the fuel injection system involves a power source with a certain pressure, such as the injection systems for diesel, methanol, and ammonia fuels. The fuel injection system achieves the predetermined injection pressure through a specific combination of booster cylinders and an electronic control cabinet. The fuel boosting and injection process of the injection valve needs to be simulated on the injection valve injection quantity measurement test bench. However, unlike high-power marine two-stroke engines, due to cost considerations, the injection valve injection quantity measurement test bench typically only simulates a single-cylinder injection valve (usually 2-3 valves) or a single injection valve, resulting in a significant reduction in high-pressure servo oil consumption (as shown in the attached figure). Figure 1 As shown in the figure, to ensure the servo oil pressure fluctuation range during fuel injection, the high-pressure common rail volumes of both should be as consistent as possible. During the test, because the high-pressure servo oil could not fully flow back to the servo oil tank to participate in the circulation cooling, the high-pressure common rail temperature gradually rose and became uncontrollable under the influence of the periodic supply of high-pressure servo oil and the ambient temperature. Ultimately, this resulted in a significant difference between the test bench conditions (oil viscosity-temperature characteristics, oil elastic modulus, etc.) and the on-machine environment, and the excessively high servo oil temperature would cause the oil to deteriorate easily, shortening its service life and making it prone to generating impurities. Summary of the Invention

[0003] The purpose of this invention is to provide a high-pressure common rail system for a test bench for measuring the injection volume of an injection valve, in order to overcome the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides a high-pressure common rail system for an injection valve injection quantity measurement test bench, including an injection quantity measurement module, a fuel storage and pumping circulation module connected to the injection quantity measurement module, a high-pressure common rail module connected to the injection quantity measurement module, a servo oil storage and pumping module connected to the high-pressure common rail module and a servo oil tank four, and a servo oil cooling module connected to the servo oil tank four.

[0005] The injection quantity measurement module includes a test bench, a fuel injector mounted on the test bench, a booster piston connected to the fuel injector, and a two-position three-way valve connected to the booster chamber of the booster piston. The low-pressure chamber of the booster piston and the test bench are connected to the fuel storage and pumping circulation module. The two-position three-way valve is also connected to the servo oil tank and the high-pressure common rail module.

[0006] The high-pressure common rail module includes a high-pressure common rail connected to the two-position three-way valve. One end of the high-pressure common rail is connected to the servo oil storage and pumping module via a one-way valve, and the other end is connected to servo oil tank one and servo oil tank two, respectively.

[0007] Preferably, when the fuel injector needs to perform an injection action, the two-position three-way valve is energized and the valve core position is switched. The high-pressure servo oil in the high-pressure common rail enters the booster chamber of the booster piston. Under the action of the boost ratio, the fuel in the low-pressure chamber is boosted to 600 bar to 700 bar and enters the fuel injector through the fuel delivery pipe. The high-pressure fuel overcomes the force of the return spring to achieve injection.

[0008] Preferably, when the fuel injection valve needs to end the injection action, the two-position three-way valve is de-energized and the valve core is reset, the servo oil in the booster piston flows back to the servo oil tank, stopping the boosting action, and the spring in the fuel injector is reset to end the injection.

[0009] Preferably, the high-pressure common rail is connected to the servo oil tank one via safety valve two, and to the servo oil tank two via electromagnetic switch valve two.

[0010] Preferably, the high-pressure common rail is equipped with a pressure transmitter and a temperature transmitter.

[0011] Preferably, the fuel storage and pumping circulation module includes a filter three, a cooler one, a heater one, a pumping device one, a fuel storage tank, and a cooler two; when the pumping device one is energized and started, fuel is drawn from the fuel storage tank, through the heater one, the cooler one, the filter three, and the one-way valve two, and enters the low-pressure chamber of the booster piston.

[0012] Preferably, the servo oil storage and pumping module includes a filter two, a pumping device two, and a safety valve one. When the pumping device two is powered on, the servo oil flows from the servo oil tank four through the filter two and the one-way valve one into the high-pressure common rail.

[0013] Preferably, the test bench is connected to the fuel storage and pumping circulation module via an injection metering device. Fuel is injected into the injection metering device, and after metering, the fuel is cooled by the second cooler and then flows back to the fuel storage tank.

[0014] Preferably, the servo oil cooling module includes a filter 1, an electromagnetic switch valve 1, a cooler 3, a filter 4, a pumping device 3, and a heater 2. The servo oil tank 4 is equipped with a temperature transmitter 2. When the temperature transmitter 2 detects that the temperature inside the servo oil tank 4 is too low, the heater 2 is energized to heat the oil until the temperature meets the requirements, and then the power is cut off. When the temperature transmitter 2 detects that the temperature inside the servo oil tank 4 is higher than the specified value, the pumping device 3 is energized and started, and the servo oil is circulated and cooled from the servo oil tank 4 through the cooler 3 and the filter 4.

[0015] Preferably, during circulating cooling, the cooling water flows through the filter, the electromagnetic switch valve, and the cooler for cooling and heat exchange.

[0016] This invention proposes a high-pressure common rail system suitable for a test bench that meets the requirements for measuring the injection volume of an injection valve. Its beneficial effects include: 1) by adjusting the consumption of high-pressure servo oil, the test bench test conditions are made closer to the machine environment, ensuring the validity of the test results; 2) by extending the service oil usage time, the test cost is reduced; 3) by delaying the deterioration of servo oil, the contaminants in the servo oil of the test system are reduced. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the high-pressure servo oil consumption mentioned in the background section.

[0018] Figure 2 This is a schematic diagram of the high-pressure common rail internal pressure of the high-pressure common rail system of the injection valve injection quantity measurement test bench of the present invention;

[0019] Figure 3 This is a schematic diagram of the high-pressure common rail system of the injection valve injection quantity measurement test bench of the present invention;

[0020] Figure 4 This is a schematic diagram of the high-pressure common rail system of the injection valve injection quantity measurement test bench of the present invention.

[0021] Attached reference numerals: 1. Servo oil cooling module; 2. Filter 1; 3. Solenoid valve 1; 4. Filter 2; 5. Safety valve 1; 6. Check valve 1; 7. Pressure transmitter; 8. Temperature transmitter 1; 9. High-pressure common rail; 10. Two-position three-way valve; 11. Solenoid valve 2; 12. Safety valve 2; 13. Servo oil tank 1; 14. High-pressure common rail module; 15. Servo oil tank 2; 16. Servo oil tank 3; 17. Boosting piston; 18. Check valve 2; 19. Filter 3; 20. Cooler 1; 21. Heater 1; 22. Pumping device 1; 23. Fuel storage tank; 24. Cooler 2; 25. Fuel injector; 26. Test bench; 27. Injection quantity measurement module; 28. Servo oil tank 4; 29. ​​Servo oil storage and pumping module; 30. Pumping device 2; 31. Temperature transmitter 2; 32. Heater 2; 33. Pumping device 3; 34. Cooler 3; 35. Filter 4; 36. Fuel storage and pumping circulation module; 37. Electrical control system; 38. Injection quantity metering device. Detailed Implementation

[0022] 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.

[0023] This invention discloses a high-pressure common rail system for a test bench for measuring the injection volume of an injection valve.

[0024] Figure 1 The diagram shows the overall structure of the injection valve injection quantity measurement test bench, which mainly consists of a servo oil cooling module 1, a high-pressure common rail module 14, a fuel storage and pumping circulation module 36, an injection quantity measurement module 27, a servo oil storage and pumping module 29, and an electrical control system 37. Specifically, it includes filter 1 (2), filter 2 (4), filter 3 (19), filter 4 (35), solenoid valve 1 (3), solenoid valve 2 (11), safety valve 1 (5), safety valve 2 (12), servo oil tank 1 (13), servo oil tank 2 (15), servo oil tank 3 (16), servo oil tank 4 (28), check valve 1 (6), check valve 2 (18), pressure transmitter 7, temperature transmitter 1 (8), temperature transmitter 2 (31), high-pressure common rail 9, two-position three-way valve 10, booster piston 17, cooler 1 (20), cooler 2 (24), cooler 3 (34), heater 1 (21), heater 2 (32), pumping device 1 (22), pumping device 2 (30), pumping device 3 (33), fuel storage tank 23, fuel injector 25, test bench 26, and injection quantity metering device 38.

[0025] The implementation principle of this invention is as follows:

[0026] On the test bench 26, a fuel injector 25 is placed; the low-pressure fuel pumping device 22 is energized and started, and fuel is drawn from the fuel storage tank 23, through the heater 21, cooler 20, filter 3 19, and check valve 2 18, and enters the low-pressure chamber of the booster piston 17.

[0027] Servo oil high-pressure pumping device 230 is started upon power-up. Servo oil flows from servo oil tank 428, through filter 24, and check valve 16, into high-pressure common rail 9 (rail pressure is typically 250 bar to 450 bar). Safety valve 15 and safety valve 212 are used to ensure that the servo oil system pressure does not exceed the safe range.

[0028] When the fuel injection valve needs to perform injection, the two-position three-way valve 10 is energized and the valve core position is switched. The high-pressure servo oil in the high-pressure common rail 9 enters the booster chamber of the booster piston 17. Under the action of the boost ratio, the fuel in the low-pressure chamber is boosted to 600 bar to 700 bar and enters the fuel injector 25 through the fuel delivery pipe. The high-pressure fuel overcomes the force of the reset spring to achieve injection.

[0029] When the fuel injection valve needs to end the injection action, the two-position three-way valve 10 is de-energized and the valve core is reset. The servo oil in the booster piston 17 flows back to the servo oil tank, stopping the boosting action. The spring in the fuel injector 25 is reset and the injection ends.

[0030] Fuel is injected into the injection metering device 38. After metering, the fuel is cooled by the cooler 24 and then flows back to the fuel storage tank 23.

[0031] When temperature transmitter 231 detects that the temperature inside servo oil tank 428 is too low, heater 232 is energized to heat the oil until the temperature meets the requirements and then the power is cut off.

[0032] When temperature transmitter 231 detects that the temperature inside servo oil tank 428 is higher than the specified value, circulation pump 33 is energized and started. Servo oil flows from servo oil tank 428, through cooler 334 and filter 435 for circulation cooling. During this process, cooling water flows through filter 12 for cooling, electromagnetic switch valve 13 (energized), and cooler for cooling and heat exchange.

[0033] When the temperature transmitter 8 detects that the temperature inside the high-pressure common rail 9 is higher than the specified value, it can be adjusted in the following two ways:

[0034] 1. By de-energizing the two-position three-way valve 10, high-pressure servo oil cannot enter the booster chamber of the booster piston 17, thus ending the injection action of the fuel injector 25, i.e., the test is temporarily terminated. The solenoid switch valve 11 is energized and the valve core position is switched, and the servo oil in the high-pressure common rail 9 will continue to circulate. The temperature in the servo oil tank 28 will rise, and the servo oil cooling module 1 will circulate and cool the oil in the servo oil tank. When the temperature transmitter 8 detects that the temperature in the high-pressure common rail 9 meets the specified value, the solenoid switch valve 11 is de-energized and the valve core resets, ending the servo oil circulation cooling in the high-pressure common rail 9. At this time, the test can continue.

[0035] 2. When the test needs to be continued and cannot be terminated, the servo oil in the high-pressure common rail 9 can be intermittently circulated for cooling. In one injection cycle, after the fuel injector 25 completes the injection action, the solenoid valve 11 is opened after the remaining time, so that a small amount of servo oil participates in the circulatory cooling process of the servo oil cooling module 1. The energization time of the solenoid valve 11 can be determined by monitoring the pressure value of the pressure transmitter 7. After the solenoid valve 11 is de-energized, it should be ensured that the pressure value in the high-pressure common rail 9 can rise back to the pre-injection pressure value within this cycle to ensure the same injection action in the next injection cycle, as shown in the figure below.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-pressure common rail system for a test bench for measuring the injection volume of an injection valve, characterized in that, It includes an injection quantity measurement module (27), a fuel storage and pumping circulation module (36) connected to the injection quantity measurement module (27), a high-pressure common rail module (14) connected to the injection quantity measurement module (27), a servo oil storage and pumping module (29) connected to the high-pressure common rail module (14) and the servo oil tank four (28), and a servo oil cooling module (1) connected to the servo oil tank four (28). The injection quantity measurement module (27) includes a test bench (26), a fuel injector (25) mounted on the test bench (26), a booster piston (17) connected to the fuel injector (25), and a two-position three-way valve (10) connected to the booster chamber of the booster piston (17). The low-pressure chamber of the booster piston (17) and the test bench (26) are connected to the fuel storage and pumping circulation module (36). The two-position three-way valve (10) is also connected to the servo oil tank three (16) and the high-pressure common rail module (14). The high-pressure common rail module (14) includes a high-pressure common rail (9) connected to the two-position three-way valve (10). One end of the high-pressure common rail (9) is connected to the servo oil storage and pumping module (29) through a one-way valve (6), and the other end is connected to the servo oil tank (13) and the servo oil tank (15) respectively.

2. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that, When the fuel injector (25) needs to perform injection, the two-position three-way valve (10) is energized and the valve core position is switched. The high-pressure servo oil in the high-pressure common rail (9) enters the booster chamber of the booster piston (17). Under the action of the booster ratio, the fuel in the low-pressure chamber is boosted to 600 bar to 700 bar and enters the fuel injector (25) through the fuel delivery pipe. The high-pressure fuel overcomes the force of the reset spring to achieve injection.

3. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 2, characterized in that, When the fuel injection valve needs to end the injection action, the two-position three-way valve (10) is de-energized and the valve core is reset. The servo oil in the booster piston (17) flows back to the servo oil tank, stopping the boosting action. The spring in the fuel injector (25) is reset and the injection ends.

4. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that, The high-pressure common rail (9) is connected to the servo oil tank (13) through safety valve 2 (12) and to the servo oil tank (15) through electromagnetic switch valve 2 (11).

5. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that, The high-pressure common rail (9) is equipped with a pressure transmitter (7) and a temperature transmitter (8).

6. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that, The fuel storage and pumping circulation module (36) includes filter three (19), cooler one (20), heater one (21), pumping device one (22), fuel storage tank (23), and cooler two (24); when the pumping device one (22) is powered on, fuel is drawn from the fuel storage tank (23), through the heater one (21), the cooler one (20), the filter three (19), and the one-way valve two (18), and enters the low-pressure chamber of the booster piston (17).

7. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that, The servo oil storage and pumping module (29) includes filter two (4), pumping device two (30), and safety valve one (5). When the pumping device two (30) is powered on, the servo oil is drawn from the servo oil tank four (28), through the filter two (4) and the one-way valve one (6), and enters the high-pressure common rail (9).

8. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 6, characterized in that, The test bench (26) is connected to the fuel storage and pumping circulation module (36) through the injection quantity metering device (38). The fuel is injected into the injection quantity metering device (38), and after metering, the fuel is cooled by the second cooler (24) and flows back to the fuel storage tank (23).

9. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 1, characterized in that, The servo oil cooling module (1) includes a filter (2), an electromagnetic switch valve (3), a cooler (34), a filter (35), a pumping device (33), and a heater (32). The servo oil tank (28) is equipped with a temperature transmitter (31). When the temperature transmitter (31) detects that the temperature inside the servo oil tank (28) is too low, the heater (32) is energized to heat the oil until the temperature meets the requirements and then the power is cut off. When the temperature transmitter (31) detects that the temperature inside the servo oil tank (28) is higher than the specified value, the pumping device (33) is energized and started, and the servo oil is circulated and cooled from the servo oil tank (28) through the cooler (34) and the filter (35).

10. The high-pressure common rail system of the injection valve injection quantity measurement test bench according to claim 9, characterized in that, During circulating cooling, cooling water flows through the filter (2), the electromagnetic switch valve (3), and the cooler for cooling and heat exchange.

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