A test platform for high-pressure fuel injection electromagnetic valve of marine diesel engine

Abstract

The utility model discloses a marine diesel engine high pressure fuel injection solenoid valve test platform, including solenoid valve testing arrangement and electronic injection control unit, solenoid valve testing arrangement includes pneumatic hydraulic unit and test unit, pneumatic hydraulic unit and test unit are communicated through high pressure quick -joint, test unit includes fuel injection solenoid valve, electronic injection control unit electricity is connected fuel injection solenoid valve, for providing millisecond level period pulse for fuel injection solenoid valve, drive fuel injection solenoid valve open, close action. Pneumatic hydraulic unit includes quick air joint, one end of quick air joint communicates the work air source of marine repair interval, and the other end communicates air filter, the utility model discloses the purpose in at to overcome the defect of current and provide a marine diesel engine high pressure fuel injection solenoid valve test platform, can simulate diesel engine real operation condition to adjust solenoid valve opening, stop time, to solenoid valve inspection, repair bring great convenience.

Description

Technical Field

[0001] This utility model relates to a test platform for high-pressure fuel injection solenoid valves of marine diesel engines. Background Technology

[0002] The practical application of high-pressure common rail injection system technology for large marine diesel engines started relatively late, and it has only been gradually adopted by domestic ships in the last decade or so. Currently, research on high-pressure common rail system injection solenoid valve testing systems mainly focuses on two aspects: one is the systematic simulation testing platform of research institutions such as universities; the other is the low-pressure mechanical simple single-injection testing device.

[0003] The high-pressure common rail injection system operates at 1200 bar and has a maximum withstand pressure of 1800 bar. Previously, testing platforms showed low oil pressure and low coil drive voltage, making it impossible to accurately verify the performance of the injection solenoid valves. Repair personnel were unable to inspect and diagnose solenoid valve malfunctions. Untested injection solenoid valves were repaired and directly reinstalled into the main engine, causing diesel engines to fail to ignite. This resulted in disassembly and reinstallation, wasting manpower and resources and posing a safety hazard to the vessel. Therefore, improvements are necessary to address these issues.

[0004] Therefore, a test platform for high-pressure fuel injection solenoid valves for marine diesel engines is proposed to address the above problems. Utility Model Content

[0005] The purpose of this utility model is to overcome the existing defects and provide a test platform for high-pressure fuel injection solenoid valves of marine diesel engines. It can simulate the actual operating conditions of diesel engines to adjust the opening and stopping time of solenoid valves, which greatly facilitates the inspection and repair of solenoid valves.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a test platform for a high-pressure fuel injection solenoid valve of a marine diesel engine, comprising a solenoid valve test device and an electronic fuel injection control unit; The solenoid valve testing device includes a pneumatic-hydraulic unit and a testing unit, which are connected by a high-pressure quick connector. The test unit includes a fuel injection solenoid valve, and the electronic fuel injection control unit is electrically connected to the fuel injection solenoid valve to provide millisecond-level periodic pulses to drive the fuel injection solenoid valve to open and close.

[0007] Preferably, the pneumatic-hydraulic unit includes a quick-connect air connector, one end of which is connected to the working air source of the ship's maintenance workshop, and the other end is connected to an air filter. The other end of the air filter is connected to an air pressure reducing valve, and the other end of the air pressure reducing valve is connected to a pneumatic-hydraulic pump. The pneumatic-hydraulic pump draws hydraulic oil from the servo oil tank through the oil filter and pumps it to high-pressure oil. The high-pressure oil then passes through a hydraulic relief valve to the high-pressure quick-connect air connector.

[0008] Preferably, the test unit further includes a high-pressure common rail, the inlet of which is connected to the high-pressure quick connector, and the outlet is connected to an oil pressure gauge and a valve seat respectively; the outlet of the valve seat is connected to the inlet of the injection solenoid valve, and the drain port of the valve seat is connected to the drain port of the injection solenoid valve and a check valve; the outlet of the injection solenoid valve sprays hydraulic oil to a first graduated measuring cup via a flow restrictor; the hydraulic oil is recovered to a second graduated measuring cup via the drain port of the check valve.

[0009] Preferably, the solenoid valve testing device includes a 220V AC power supply, which provides 24V power to the PWM pulse generator via a 24V rectifier module and provides drive power to the high-power MOS trigger module via a 90V switching power supply; the PWM pulse generator generates pulse control signals that are input to the control terminal of the high-power MOS trigger module and the intelligent optical grating meter; the output terminal of the high-power MOS trigger module generates a 2-4ms 90V DC turn-on voltage, which acts on the fuel injection solenoid valve coil.

[0010] Preferably, it also includes a smart voltmeter and a flat panel oscilloscope; the smart voltmeter is used to measure the drive voltage of the high-power MOS trigger module; the flat panel oscilloscope is used to acquire waveform information when the output terminal of the high-power MOS trigger module is turned on and off.

[0011] Preferably, the output end of the air pressure reducing valve is provided with a switching valve, and an air pressure gauge is provided at the end of the switching valve near the pneumatic hydraulic pump.

[0012] Preferably, a first oil pressure gauge is provided between the hydraulic relief valve and the high-pressure quick connector.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This marine diesel engine high-pressure injection solenoid valve test platform is a highly integrated, modular, and compact platform. It delivers high-pressure oil to the common rail of the test unit via a pneumatic-hydraulic unit, and utilizes a millisecond-level pulse voltage provided by the electronic injection control unit to drive the injection solenoid valve to switch and inject oil. It can perform pre-disassembly testing, response testing, and reliability testing for solenoid valve maintenance. It solves the problems of low testing pressure, large space occupation, and complex design of previous test platforms. By assembling three unit boxes together, it features a simple structure, novel design, convenient and quick operation, low cost, and high practical value, providing favorable conditions for frontline maintenance of injection solenoid valves on ships.

[0014] The testing process simulates the actual operating conditions of a diesel engine to adjust the pulse interval cycle of the solenoid valve's opening and closing. It overcomes the difficulties in connecting the fuel injection solenoid valve pipeline, and features high integration, modular assembly, ease of use, and strong practicality, greatly facilitating the inspection and repair of solenoid valves. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is an assembly diagram of the test platform for the high-pressure fuel injection solenoid valve of the marine diesel engine according to this utility model. Figure 2 This is a schematic diagram of the pipeline connection between the pneumatic-hydraulic unit and the testing unit of this utility model; Figure 3 This is a schematic diagram of the electronic fuel injection control unit of this utility model.

[0016] In the diagram: 1. Air quick connector; 2. Air filter; 3. Air pressure reducing valve; 4. Switch valve; 5. Air pressure gauge; 6. Pneumatic hydraulic pump; 7. Servo oil tank; 8. Oil filter; 9. Hydraulic relief valve; 10. First oil pressure gauge; 11. High-pressure quick connector; 12. High-pressure common rail; 13. Second oil pressure gauge; 14. Valve seat; 15. Check valve; 16. Injection solenoid valve; 17. Flow restrictor valve; 18. First graduated measuring cup; 19. Second graduated measuring cup; 20. ECU device; 21. Test unit; 22. Pneumatic hydraulic unit; 23. Electronic fuel injection control unit; 24. Solenoid valve coil; 25. Valve core; 26. Oil inlet; 27. Oil outlet. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1-3 As shown, a test platform for a high-pressure fuel injection solenoid valve of a marine diesel engine includes a solenoid valve test device and an electronic fuel injection control unit 23. The solenoid valve test device includes a pneumatic-hydraulic unit 22 and a test unit 21, which are connected via a high-pressure quick connector 11. The test unit 21 includes a fuel injection solenoid valve 16, which is electrically connected to the electronic fuel injection control unit 23. The control unit 23 provides millisecond-level periodic pulses to the fuel injection solenoid valve 16, driving it to open and close. The pneumatic-hydraulic unit 22, the test unit 21, and the electronic fuel injection control unit 23 are modularly designed, each being an independent housing, fixed together by bolts for easy assembly and maintenance.

[0019] Specifically, the electronic fuel injection control unit 23 provides millisecond-level periodic pulses to the fuel injection solenoid valve coil 24, driving the fuel injection solenoid valve 16 to open and close. The electronic fuel injection control unit 23 drives a high-power MOS trigger module through a PWM pulse generator to output a 90VDC pulse voltage to the fuel injection solenoid valve coil 16, and collects the pulse voltage, number of pulses, and waveform through various instruments and a flat panel oscilloscope.

[0020] Specifically, the pneumatic-hydraulic unit 22 includes a quick-connect air connector 1. One end of the quick-connect air connector 1 is connected to the working air source in the ship's maintenance workshop, and the other end is connected to an air filter 2. The other end of the air filter 2 is connected to an air pressure reducing valve 3, and the other end of the air pressure reducing valve 3 is connected to a pneumatic-hydraulic pump 6. The pneumatic-hydraulic pump 6 draws hydraulic oil from the servo oil tank 7 through the oil filter 8 and pumps it as high-pressure oil. The high-pressure oil then passes through a hydraulic relief valve 9 to a high-pressure quick connector 11. A switching valve 4 is installed at the output end of the air pressure reducing valve 3, and an air pressure gauge 5 is installed at the end of the switching valve 4 near the pneumatic-hydraulic pump 6. A first oil pressure gauge 10 is installed between the hydraulic relief valve 9 and the high-pressure quick connector 11. The pneumatic-hydraulic pump 6 is a PP-160 type, which converts low air pressure (7-15 bar) into high oil pressure, that is, it uses the air pressure at the large-area piston end to convert into high hydraulic pressure at the small-area piston end, with a maximum pressure of 1600 bar. The high-pressure common rail is a HILUX-2G type, which uses a double-walled cavity and has high pressure resistance. The function of the air pressure reducing valve 3 is to control the hydraulic oil pressure by adjusting the air pressure of this valve; the function of the hydraulic relief valve 9 is to control the maximum oil pressure in the hydraulic pipeline and to act as a safety valve.

[0021] Specifically, the 7-15 bar working air is filtered by the air filter 2 via the quick-connect air connector 1, then adjusted by the air pressure reducing valve 3, and connected to the switching valve 4. The outlet of the switching valve 4 is connected to the air source interface of the pneumatic hydraulic pump 6, driving the pneumatic hydraulic pump 6 to operate. The pneumatic hydraulic pump 6 delivers pressurized oil to the hydraulic relief valve 9. If the pressure exceeds 1200 bar, the oil returns to the servo oil tank 7 through the drain port of the hydraulic relief valve 9. The servo oil pressure can be flexibly adjusted within the range of 0-1200 bar.

[0022] Specifically, the test unit 21 also includes a high-pressure common rail 12. The inlet of the high-pressure common rail 12 is connected to the high-pressure quick connector 11, and the outlet is connected to the oil pressure gauge 13 and the valve seat 14 respectively. The outlet of the valve seat 14 is connected to the inlet of the injection solenoid valve 16, and the drain port of the valve seat 14 is connected to the drain port of the injection solenoid valve 16 and the check valve 15. The outlet of the injection solenoid valve 16 sprays hydraulic oil to the first graduated measuring cup 18 through the flow restrictor 17. The hydraulic oil is recovered to the second graduated measuring cup 19 through the drain port of the check valve 15.

[0023] Specifically, the solenoid valve testing device includes a 220V AC power supply. This 220V AC power supply, via a 24V rectifier module, provides 24V power to the PWM pulse generator, which in turn provides drive power to the high-power MOS trigger module via a 90V switching power supply. The PWM pulse generator produces pulse control signals that are input to the control terminal of the high-power MOS trigger module and an intelligent optical encoder. The output terminal of the high-power MOS trigger module generates a 2-4ms 90V DC turn-on voltage, which acts on the 16 coil of the fuel injection solenoid valve. The fuel injection stop interval is adjustable from 0.2-10s, and the operation is cyclical. The intelligent optical encoder counts the number of pulses based on the falling edge of the pulse signal, with a maximum measurement frequency of 30kHz. The device also includes an intelligent voltmeter and a flat-panel oscilloscope. The intelligent voltmeter measures the drive voltage of the high-power MOS trigger module; the flat-panel oscilloscope acquires waveform information when the output terminal of the high-power MOS trigger module turns on and off. The intelligent digital display voltmeter, model HB404, is used to measure the drive voltage of the high-power MOS trigger module and can display a 4-digit value with high accuracy. The flat panel oscilloscope acquires waveform information when the output of the high-power MOS trigger module is turned on and off. The acquired waveforms can be stored or screenshotted. The status of the fuel injection solenoid valve can be analyzed based on the waveform changes. Model: 1013D.

[0024] Specifically, during testing, the fuel injection solenoid valve 16 is fixed on the valve seat 14. The inlet of the fuel injection solenoid valve 16 is connected to the outlet of the fixed base 14, and the outlet of the fuel injection solenoid valve 16 is connected to the first graduated measuring cup 18 via a pipeline. The power switch of the electronic fuel injection control unit 23 is turned on, the pulse power supply is activated, the PWM pulse duty cycle is adjusted, different start and stop times are set, and the pulse trigger button is pressed to start the test. The test includes: pre-disassembly and inspection testing of the faulty fuel injection solenoid valve, routine testing of the solenoid valve after repair and reassembly, and durability testing of the solenoid valve under actual operating conditions.

[0025] I. Pre-disassembly testing of faulty fuel injection solenoid valve Before repairing a faulty solenoid valve, its fault symptoms should be inspected to determine the fault location, which will facilitate the next step of troubleshooting.

[0026] The specific test method is as follows: The oil pressure is controlled at 800 bar, the start time is set to 5 ms, the stop time to 2 seconds, and the cycle is repeated 50 times. The purpose is to flush the fuel injection solenoid valve and clean out the heavy oil impurities inside. The oil pressure is then increased to 1200 bar, with a start time of 5 ms and a stop time of 2 seconds. The injection quantity, voltage, and waveform curve are tested to determine the impact on the fuel injection solenoid valve, such as whether the armature lift is fully open and whether the valve core is worn or has internal leakage.

[0027] Post-repair solenoid valve response test; The routine test of the solenoid valve after repair mainly verifies whether the fault of the fuel injection solenoid valve has been eliminated and the working condition of the newly replaced parts.

[0028] The specific test method is as follows: control the oil pressure at 1000 bar, set the start time to 4 ms, the stop time to 1 s, and the number of cycles to 50. Check whether the solenoid valve vibrates and whether the injection sound is crisp when injecting oil, and monitor the voltage, waveform curve data, and whether the oil atomization effect is normal.

[0029] III. Reliability Testing of Solenoid Valves under Operating Conditions After passing the routine tests, the solenoid valve was tested under actual operating conditions, taking into account the fuel injection interval at the rated speed of 514 rpm / min for the diesel engine, to verify whether it fully meets the requirements for installation on the main unit.

[0030] The specific test method is as follows: control the oil pressure at 1200 bar, set the start time to 4 ms, the stop time to 0.5 s, and the number of cycles to 500. Test whether its performance and reliability meet the requirements. If the solenoid valve passes the test, it can be installed on the diesel engine.

[0031] This marine diesel engine high-pressure injection solenoid valve test platform is a highly integrated, modular, and compact platform. It delivers high-pressure oil to the common rail of the test unit via a pneumatic-hydraulic unit, and utilizes a millisecond-level pulse voltage provided by the electronic fuel injection control unit to drive the injection solenoid valve to switch and inject fuel. It can perform pre-disassembly testing, response testing, and reliability testing for solenoid valve maintenance. It solves the problems of low testing pressure, large space occupation, and complex design of previous test platforms. By assembling three unit boxes together, it features a simple structure, novel design, convenient and quick operation, low cost, and high practical value, providing favorable conditions for frontline maintenance of injection solenoid valves on ships.

[0032] The testing process simulates the actual operating conditions of a diesel engine to adjust the pulse interval cycle of the solenoid valve's opening and closing. It overcomes the difficulties in connecting the fuel injection solenoid valve pipeline, and features high integration, modular assembly, ease of use, and strong practicality, greatly facilitating the inspection and repair of solenoid valves.

[0033] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A test platform for high-pressure fuel injection solenoid valves of marine diesel engines, characterized in that, Includes a solenoid valve testing device and an electronic fuel injection control unit (23); The solenoid valve testing device includes a pneumatic-hydraulic unit (22) and a testing unit (21), which are connected by a high-pressure quick connector (11). The test unit (21) includes a fuel injection solenoid valve (16), and the electronic fuel injection control unit (23) is electrically connected to the fuel injection solenoid valve (16) to provide millisecond-level periodic pulses to the fuel injection solenoid valve (16) to drive the fuel injection solenoid valve (16) to open and close.

2. The marine diesel engine high-pressure fuel injection solenoid valve test platform according to claim 1, characterized in that, The pneumatic-hydraulic unit (22) includes a quick air connector (1), one end of which is connected to the working air source of the ship repair shop, and the other end is connected to an air filter (2). The other end of the air filter (2) is connected to an air pressure reducing valve (3), and the other end of the air pressure reducing valve (3) is connected to a pneumatic-hydraulic pump (6). The pneumatic-hydraulic pump (6) draws hydraulic oil from the servo oil tank (7) through the oil filter (8) and pumps it to high-pressure oil. The high-pressure oil then passes through a hydraulic relief valve (9) to the high-pressure quick connector (11).

3. The marine diesel engine high-pressure fuel injection solenoid valve test platform according to claim 2, characterized in that, The test unit (21) also includes a high-pressure common rail (12), the oil inlet of which is connected to the high-pressure quick connector (11), and the oil outlet is connected to the oil pressure gauge (13) and the valve seat (14) respectively; the oil outlet of the valve seat (14) is connected to the oil inlet of the injection solenoid valve (16), and the oil outlet of the valve seat (14) is connected to the oil outlet of the injection solenoid valve (16) and the check valve (15); the oil outlet of the injection solenoid valve (16) sprays hydraulic oil to the first graduated measuring cup (18) through the flow restrictor (17); the hydraulic oil is recovered to the second graduated measuring cup (19) through the oil outlet of the check valve (15).

4. The marine diesel engine high-pressure fuel injection solenoid valve test platform according to claim 2, characterized in that, The solenoid valve testing device includes a 220V AC power supply. The 220V AC power supply provides 24V power to the PWM pulse generator through a 24V rectifier module and provides drive power to the high-power MOS trigger module through a 90V switching power supply. The PWM pulse generator generates a pulse control signal that is input to the control terminal of the high-power MOS trigger module and the intelligent grating meter. The output terminal of the high-power MOS trigger module generates a 90V DC turn-on voltage of 2-4ms, which acts on the coil of the fuel injection solenoid valve (16).

5. The marine diesel engine high-pressure fuel injection solenoid valve test platform according to claim 4, characterized in that, It also includes a smart voltmeter and a flat panel oscilloscope; the smart voltmeter is used to measure the drive voltage of the high-power MOS trigger module; the flat panel oscilloscope is used to acquire waveform information when the output terminal of the high-power MOS trigger module is turned on and off.

6. The marine diesel engine high-pressure fuel injection solenoid valve test platform according to claim 2, characterized in that, The output end of the air pressure reducing valve (3) is provided with a switching valve (4), and an air pressure gauge (5) is provided at the end of the switching valve (4) near the pneumatic hydraulic pump (6).

7. The marine diesel engine high-pressure fuel injection solenoid valve test platform according to claim 2, characterized in that, A first oil pressure gauge (10) is provided between the hydraulic relief valve (9) and the high-pressure quick connector (11).

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