Heavy oil electronic control fuel injector test system

Abstract

The invention relates to a heavy oil electronic control fuel injector test system which is used for a performance life verification experiment of an electronic control fuel injector in a heavy oil mode so as to solve the problem that the electronic control fuel injector cannot be subjected to all-working-condition performance test analysis and external reliability test verification under the heavy oil condition. The system comprises a first oil supply module for providing low-pressure diesel oil, a second oil supply module for providing low-pressure heavy oil, a heat conduction oil module, a tested electronic control oil injector, a high-pressure oil supply module, a filtering module and a control module, under the control of the control module, the second oil supply module is firstly connected into the filtering module, low-pressure heavy oil in the second oil supply module enters the filtering module to be filtered after being indirectly heated by the heat conduction oil module, and the high-pressure oil supply module pressurizes the filtered low-pressure heavy oil to a high-pressure state so that the tested electronic control oil injector can conduct injection testing in the heavy oil state. After testing is completed, the control module controls the first oil supply module to be connected into the filtering module, the high-pressure oil supply module pressurizes filtered low-pressure diesel oil to be in a high-pressure state, and residual heavy oil in the high-pressure oil supply module and the electronic control oil injector to be tested is removed.

Description

Technical Field

[0001] The present invention relates to the technical field of diesel engine high-pressure common rail fuel systems, and specifically to a heavy oil electronic control injector test system. Background Art

[0002] With the continuous development of the shipping industry and the increasingly strict emission regulations, marine diesel engines also need to develop towards a more environmentally friendly and energy-saving direction. The electronic control high-pressure common rail technology can make the fuel burn more fully in the cylinder through sensitive electronic regulation and stable high-pressure injection, thereby improving the thermal efficiency of the diesel engine, reducing fuel consumption and pollutant emissions, which is beneficial to environmental protection and cost savings.

[0003] As an actuator of the electronic control high-pressure common rail system, the performance of the electronic control injector directly determines the performance of the engine. Coastal and ocean-going ships mostly use heavy oil as the primary fuel, which has characteristics such as high viscosity, high corrosion, and high particle size. To ensure the performance and service life of the electronic control injector when using this fuel, a dedicated heavy oil electronic control injector test system is urgently needed. Summary of the Invention

[0004] The present invention provides a heavy oil electronic control injector test system for verifying the performance and service life of the electronic control injector in the heavy oil mode, so as to solve the problems that the electronic control injector cannot conduct full-condition performance test analysis and off-engine reliability test verification under heavy oil conditions.

[0005] The technical solution of the present invention is as follows: A heavy oil electronic control injector test system includes: a first fuel supply module for providing low-pressure diesel, a second fuel supply module for providing low-pressure heavy oil, a heat transfer oil module, a tested electronic control injector, a high-pressure fuel supply module, a filtration module, and a control module; Under the control of the control module, the second fuel supply module is first connected to the filtration module. The low-pressure heavy oil in the second fuel supply module is indirectly heated by the heat transfer oil module and then enters the filtration module for filtration. The high-pressure fuel supply module boosts the filtered low-pressure heavy oil to a high-pressure state for the tested electronic control injector to conduct injection tests in the heavy oil state; After the test is completed, the control module controls the first fuel supply module to be connected to the filtration module. The high-pressure fuel supply module boosts the filtered low-pressure diesel to a high-pressure state to remove the residual heavy oil in the high-pressure fuel supply module and the tested electronic control injector.

[0006] Preferably, the second fuel supply module includes a heavy oil fuel tank with an inner and outer double-layer cavity, a heavy oil circulation pump, and a heavy oil low-pressure pump; The inner cavity of the heavy oil fuel tank stores low-pressure heavy oil. The outer cavity of the heavy oil fuel tank is connected to the heat transfer oil module. The heat transfer oil module, under the control of the control module, sends the heated heat transfer oil into the outer cavity to heat the low-pressure heavy oil; Under the control of the control module, the heavy oil circulation pump continuously circulates the low-pressure heavy oil in the inner cavity of the heavy oil tank; under the control of the control module, the heavy oil low-pressure pump pumps the low-pressure heavy oil in the inner cavity of the heavy oil tank into the filtration module.

[0007] Preferably, the heavy oil electronic control injector test system further includes: a lubrication module; Under the control of the control module, the lubrication module lubricates the high-pressure fuel supply module and the electronic control injector under test.

[0008] Preferably, the filtration module includes: a coarse filter and at least two fine filters. The coarse filter and the at least two fine filters are connected by a pre-filter reversing valve. A pre-filter pressure sensor and a post-filter pressure sensor are provided at both ends of each fine filter; The control module connects one of the fine filters into the circuit by controlling the pre-filter reversing valve; The control module identifies whether the fine filter connected into the circuit is blocked according to the pressure difference between the pre-filter pressure sensor and the post-filter pressure sensor. If it is identified that the fine filter connected into the circuit is blocked, a fine filter that has not been blocked is randomly selected and connected into the circuit.

[0009] Preferably, the input end of the filtration module is connected with a fuel supply reversing valve. The first fuel supply module is connected to the first input end of the fuel supply reversing valve, and the second fuel supply module is connected to the second input end of the fuel supply reversing valve; The control module selects to connect the first fuel supply module or the second fuel supply module to the filtration module by controlling the fuel supply reversing valve.

[0010] Preferably, the heavy oil electronic control injector test system further includes: a mixed oil collection module; A flow meter and a return oil reversing valve are connected to the output end of the high-pressure module and the output end of the electronic control injector under test. The first output end of the return oil reversing valve is connected to the input end of the second fuel supply module, and the second output end of the return oil reversing valve is connected to the input end of the mixed oil collection module; The control module obtains the corresponding performance parameters of the electronic control injector under test according to the measurement of the flow meter; The control module controls the return oil reversing valve to introduce the high-pressure heavy oil released by the high-pressure fuel supply module and the high-pressure heavy oil ejected by the electronic control injector under test into the second fuel supply module, and introduces the high-pressure mixed oil released by the high-pressure fuel supply module and the high-pressure mixed oil ejected by the electronic control injector under test into the mixed oil collection module.

[0011] Preferably, the high-pressure fuel supply module includes: a heavy oil high-pressure pump, a common rail, a mechanical pressure gauge, a pressure sensor, a safety valve, and a pneumatic pressure relief valve; The heavy oil high-pressure pump is connected to the common rail through a high-pressure oil pipe, and the common rail is connected to the electronically controlled injector to be tested through a high-pressure oil pipe; The mechanical pressure gauge, pressure sensor, safety valve and pneumatic pressure relief valve are installed on the common rail; The control module controls the balance between the amount of oil pumped into the common rail by the heavy oil high-pressure pump and the amount of oil discharged by the electronically controlled injector to be tested according to the common rail pressure detected by the pressure sensor, so as to achieve the stability of the oil pressure in the common rail chamber.

[0012] Preferably, the first fuel supply module includes a diesel fuel tank, a diesel fuel circulation pump and a diesel fuel low-pressure pump; The diesel fuel circulation pump continuously circulates the low-pressure diesel fuel inside the diesel fuel tank under the control of the control module; the diesel fuel low-pressure pump pumps the low-pressure diesel fuel inside the diesel fuel tank into the filtration module under the control of the control module; The heat transfer oil module includes a heat transfer oil tank and a heat transfer oil circulation pump; The heat transfer oil circulation pump guides the heated heat transfer oil inside the heat transfer oil tank into the outer cavity of the heavy oil tank under the control of the control module to heat the low-pressure heavy oil in the inner cavity.

[0013] Preferably, the lubrication module includes: a lubricating oil tank, a lubricating oil circulation pump, a lubricating oil pump and a cooling heat exchanger; The lubricating oil circulation pump continuously circulates the lubricating oil inside the lubricating oil tank under the control of the control module; The lubricating oil in the lubricating oil tank is guided by the lubricating oil pump to the heavy oil high-pressure pump and the electronically controlled injector to be tested for lubrication, and then flows into the cooling heat exchanger to exchange heat with the cooling water and then returns to the lubricating oil tank.

[0014] Preferably, a first temperature sensor is provided at the input end of the high-pressure fuel supply module, a second temperature sensor is provided at a position close to the second fuel supply module, and a third temperature sensor is provided at a position close to the heat transfer oil module; If the temperature value feedback by the second temperature sensor is lower than the preset temperature, the control module controls the heat transfer oil module to start and indirectly heat the low-pressure heavy oil in the second fuel supply module; During the process of indirectly heating the low-pressure heavy oil in the second fuel supply module, if the temperature difference between the first temperature sensor and the second temperature sensor exceeds the preset temperature range and the temperature feedback by the first temperature sensor and / or the second temperature sensor does not exceed the preset temperature, the control module controls the heat transfer oil module to continue indirectly heating the low-pressure heavy oil in the second fuel supply module; if the temperature difference between the first temperature sensor and the second temperature sensor is within the preset temperature range and the temperatures feedback by the first temperature sensor and the second temperature sensor both exceed the preset temperature, the control module controls the heat transfer oil module to stop indirectly heating the low-pressure heavy oil in the second fuel supply module; The control module identifies the real-time heating temperature of the heat transfer oil module according to the temperature feedback by the third temperature sensor.

[0015] The beneficial effects of the present invention are as follows: This test system realizes the full - working - condition performance test and reliability test verification of the electronically controlled fuel injector under the condition of no heavy oil outside the engine.

[0016] Since heavy oil is an asphalt - like paste at normal temperature, direct heating will cause local boiling, leading to heavy oil splashing and causing safety accidents. This test system indirectly heats the low - pressure heavy oil in the second fuel supply module, making the heavy oil evenly heated and avoiding safety accidents and the problem of partial evaporation of heavy oil caused by too high local temperature.

[0017] Since heavy oil is a residual product after crude oil refining, it contains a large amount of impurities and refining catalysts, and ordinary filtration methods are extremely easy to be blocked. Therefore, two - stage filtration measures are adopted. At the same time, since there are precision pairs inside the common - rail electronically controlled fuel injector and the requirement for fine filtration is above 10um, the fine - filter element may still be blocked during the long - term verification process of the test bench. Therefore, at least two fine filters are used, and pressure sensors are installed before and after each fine filter. The usage situation of the fine filter is judged by observing the pressure difference before and after the fine filter. When the fine filter becomes blocked, the fine filter is automatically replaced by controlling the operation of the pre - filter change - over valve. This method can ensure that the test does not stop for a long time due to the blockage of the fine filter and reduce the risk of heavy oil condensation caused by long - term shutdown.

[0018] This test system adopts dual - path low - pressure oil - way control, which can realize the automatic switching of the fuel medium from heavy oil to diesel. After connecting the first fuel supply module to the filtration module, diesel can be used to remove the residual heavy oil in the pipeline system to prevent blockage of the pipeline due to condensation after shutdown; at the same time, the switching test between heavy oil and diesel can also be carried out to verify the performance stability of the electronically controlled fuel injector during the fuel conversion process, further conforming to the actual situation of ship operation.

[0019] Since heavy oil is in a high - temperature state and has high corrosiveness during use, it is impossible to achieve rail - pressure control through traditional PCV valve parts. Therefore, a special heavy - oil high - pressure pump is adopted. By monitoring the pressure in the common rail, the oil output of the high - pressure oil pump is automatically adjusted to achieve the dynamic balance of the oil inflow and outflow inside the common rail, and finally achieve stable rail - pressure control.

[0020] This test system adopts full - process electronic control and multi - node electronic monitoring. The entire mechanical mechanism is enclosed in a protective cover. The operator only needs to operate and monitor in the upper computer of the control module, reducing the operation difficulty, reducing contact, and greatly reducing the risk during use. Brief Description of the Drawings

[0021] Figure 1 It is the principle structure diagram of the heavy - oil electronically controlled fuel injector test system of the present invention; Figure 2This is the detailed structure diagram of the heavy oil electronic control injector test system of the present invention; Description of the reference numerals: 1 - Diesel fuel tank, 2 - Heavy oil fuel tank, 3 - Heat transfer oil fuel tank, 4 - Lubricating oil fuel tank, 5 - Mixing fuel tank, 6 - Diesel low-pressure pump, 7 - Heavy oil low-pressure pump, 8 - Lubricating oil pump, 9 - Fuel supply change-over valve, 10 - Coarse filter, 11 - Pressure sensor before filtration, 12 - Change-over valve before filtration, 13 - First fine filter, 14 - Second fine filter, 15 - Change-over valve after filtration, 16 - Pressure sensor after filtration, 17 - First temperature sensor, 18 - Heavy oil high-pressure pump, 19 - Common rail, 20 - Mechanical pressure gauge, 21 - Pressure sensor, 22 - Electronic control injector to be tested, 23 - Safety valve, 24 - Pneumatically controlled pressure relief valve, 25 - Flowmeter, 26 - Return oil change-over valve, 27 - Third temperature sensor, 28 - Cooling heat exchanger, 29 - Fourth temperature sensor, 30 - Second temperature sensor, 31 - Fifth temperature sensor, 32 - PLC control system, 33 - Host computer, 34 - Diesel fuel circulation pump, 35 - Heavy oil circulation pump, 36 - Heat transfer oil circulation pump, 37 - Lubricating oil circulation pump. Specific embodiments

[0022] For the convenience of those skilled in the art, the present invention patent will be further described below with reference to the accompanying drawings. The description is relatively detailed and complete, but it should not be construed as a limitation on the scope of the present invention patent. Obvious deformations and replacement forms of the following examples are all within the protection scope of this patent.

[0023] As Figure 1 shown, the present application provides a heavy oil electronic control injector test system, including: a first fuel supply module for providing low-pressure diesel, a second fuel supply module for providing low-pressure heavy oil, a heat transfer oil module, an electronic control injector to be tested, a high-pressure fuel supply module, a filtration module, and a control module.

[0024] Under the control of the control module, the second fuel supply module is first connected to the filtration module. The low-pressure heavy oil in the second fuel supply module is indirectly heated by the heat transfer oil module and then enters the filtration module for filtration. The high-pressure fuel supply module pressurizes the filtered low-pressure heavy oil to a high-pressure state for the electronic control injector to be tested to perform injection tests in the heavy oil state; After the test is completed, the control module controls the first fuel supply module to be connected to the filtration module. The high-pressure fuel supply module pressurizes the filtered low-pressure diesel to a high-pressure state to remove the residual heavy oil in the high-pressure fuel supply module and the electronic control injector to be tested.

[0025] Operating mode of heavy oil heating system: At normal temperature, heavy oil is in a paste-like semi-solid state. When in use, it needs to be heated to above 95°C. When heating heavy oil, first turn on the heat transfer oil circulation pump 36 to heat the heat transfer oil and circulate the heat transfer oil to the outer cavity of the heavy oil tank 2, and turn on the heavy oil circulation pump 3535. As the heat transfer oil continuously heats up, the heavy oil in the heavy oil tank 2 gradually becomes a thin liquid and continuously circulates under the action of the heavy oil circulation pump 35, achieving a uniform heating effect.

[0026] As Figure 2 shown, the input end of the filtration module is connected to a fuel supply changeover valve 9. The first fuel supply module is connected to the first input end of the fuel supply changeover valve 9, and the second fuel supply module is connected to the second input end of the fuel supply changeover valve 9; the control module controls the fuel supply changeover valve 9 to select to connect the first fuel supply module or the second fuel supply module to the filtration module.

[0027] As Figure 2 shown, the second fuel supply module includes a heavy oil tank 2 with inner and outer double cavities, a heavy oil circulation pump 35, and a heavy oil low-pressure pump 7; Low-pressure heavy oil is stored in the inner cavity of the heavy oil tank 2. The outer cavity of the heavy oil tank 2 is communicated with the heat transfer oil module. The heat transfer oil module, under the control of the control module, sends the heated heat transfer oil into the outer cavity to heat the low-pressure heavy oil; The heavy oil circulation pump 35, under the control of the control module, continuously circulates the low-pressure heavy oil in the inner cavity of the heavy oil tank 2; the heavy oil low-pressure pump 7, under the control of the control module, pumps the low-pressure heavy oil in the inner cavity of the heavy oil tank 2 into the filtration module.

[0028] Since the heavy oil tank 2 has inner and outer double cavities, the inner cavity of the heavy oil tank 2 stores low-pressure heavy oil, and the middle interlayer is connected to the heat transfer oil tank 3. The heat transfer oil is heated to the corresponding temperature in the heat transfer oil tank 3 and enters the interlayer of the heavy oil tank 2 under the action of the heat transfer oil circulation pump 36 to perform oil bath heating on the inner-layer heavy oil of the heavy oil tank 2. At the same time, the heavy oil circulation pump 35 continuously circulates the internal heavy oil of the heavy oil tank 2 to ensure uniform heating.

[0029] Referring to Figure 1 , the heavy oil electronic control injector test system further includes: a lubrication module; under the control of the control module, the lubrication module lubricates the high-pressure fuel supply module and the tested electronic control injector.

[0030] As Figure 2 shown, the lubrication module includes: a lubricating oil tank 4, a lubricating oil circulation pump 37, a lubricating oil pump 8, and a cooling heat exchanger 28; the lubricating oil circulation pump 37, under the control of the control module, continuously circulates the lubricating oil inside the lubricating oil tank 4; the lubricating oil in the lubricating oil tank 4 is introduced by the lubricating oil pump 8 to the heavy oil high-pressure pump 18 and the tested electronic control injector 22 for lubrication, and then flows into the cooling heat exchanger 28 to exchange heat with cooling water and then returns to the lubricating oil tank 4.

[0031] The lubricating oil circulation pump 37 continuously circulates the lubricating oil inside the lubricating oil tank 4 to ensure the lubricating oil temperature; the lubricating oil pump 8 pumps the lubricating oil into the electronic control fuel injector 22 to be tested and the heavy oil high-pressure pump 18 for lubrication and cooling, and then returns to the lubricating oil tank 4 after being cooled by the cooling heat exchanger 28.

[0032] Refer to Figure 2 , the filtering module includes: a coarse filter 10 and at least two fine filters. The coarse filter 10 and the at least two fine filters are connected by a pre-filter reversing valve 12. A pre-filter pressure sensor 11 and a post-filter pressure sensor 16 are arranged at both ends of each fine filter; The control module connects one of the fine filters into the circuit by controlling the pre-filter reversing valve 12; The control module identifies whether the fine filter connected into the circuit is blocked according to the pressure difference between the pre-filter pressure sensor 11 and the post-filter pressure sensor 16. If it is identified that the fine filter connected into the circuit is blocked, a fine filter that has not been blocked is randomly selected and connected into the circuit.

[0033] Such as Figure 2 , the output end of the coarse filter 10 is connected to the fuel supply reversing valve 9. In the embodiment of the present application, a post-filter reversing valve 15 can also be arranged at the output end of the fine filter. At this time, there are multiple input ends of the post-filter reversing valve 15, one output end is connected to one fine filter, and the output end of the post-filter reversing valve 15 is connected to the input end of the high-pressure fuel supply module.

[0034] In this embodiment, the at least two fine filters are two, namely the first fine filter 13 and the second fine filter 14. For example, when the first fine filter 13 is connected to the coarse filter 10, if the pressure difference before and after the first fine filter 13 is greater than 10 bar, it indicates that the first fine filter 13 is blocked. The fuel is adjusted to enter the second fine filter 14 by controlling the pre-filter reversing valve 12, and an alarm mark is made for the blocked filter element in the upper computer 33 to remind the operator to clean and replace it.

[0035] Refer to Figure 2 , in the embodiment of the present application, the high-pressure fuel supply module includes: a heavy oil high-pressure pump 18, a common rail 19, a mechanical pressure gauge 20, a pressure sensor 21, a safety valve 23, and a pneumatic pressure relief valve 24; The heavy oil high-pressure pump 18 is connected to the common rail 19 through a high-pressure oil pipe, and the common rail 19 is connected to the electronic control fuel injector 22 to be tested through a high-pressure oil pipe; The mechanical pressure gauge 20, the pressure sensor 21, the safety valve 23, and the pneumatic pressure relief valve 24 are installed on the common rail 19; The control module controls the balance between the amount of oil pumped into the common rail 19 by the heavy oil high-pressure pump 18 and the oil output of the electronically controlled injector 22 to be tested according to the rail pressure of the common rail 19 detected by the pressure sensor 21, so as to achieve the stable oil pressure in the chamber of the common rail 19.

[0036] The mechanical safety valve 23 is used to automatically open and drain oil to reduce pressure when the internal rail pressure of the common rail 19 exceeds its pressure, so as to prevent safety risks caused by excessive pressure.

[0037] By operating the pneumatic pressure relief valve 24, the operator can manually control the entry of compressed air to control the opening and closing of the valve, so as to achieve the manual control of the establishment of high pressure.

[0038] The mechanical pressure gauge 20 installed on the common rail 19 facilitates the intuitive observation of pressure changes and serves as a backup pressure test device in case the sensor accuracy drifts and cannot be known.

[0039] Refer to Figure 1 and Figure 2 , the heavy oil electronically controlled injector test system further includes: a mixed oil collection module; A flow meter 25 and a return oil reversing valve 26 are connected to the output end of the high-pressure module and the output end of the electronically controlled injector 22 to be tested. The first output end of the return oil reversing valve 26 is connected to the input end of the second oil supply module, and the second output end of the return oil reversing valve 26 is connected to the input end of the mixed oil collection module; The control module obtains the corresponding performance parameters of the electronically controlled injector 22 to be tested according to the measurement of the flow meter 25; The control module controls the return oil reversing valve 26 to introduce the high-pressure heavy oil released by the high-pressure oil supply module and the high-pressure heavy oil sprayed by the electronically controlled injector under test into the second oil supply module, and introduce the high-pressure mixed oil released by the high-pressure oil supply module and the high-pressure mixed oil sprayed by the electronically controlled injector under test into the mixed oil collection module.

[0040] Refer to Figure 2 , the first oil supply module includes a diesel fuel tank 1, a diesel fuel circulation pump 34 and a diesel fuel low-pressure pump 6; the diesel fuel circulation pump 34 continuously circulates the low-pressure diesel fuel inside the diesel fuel tank 1 under the control of the control module; the diesel fuel low-pressure pump 6 pumps the low-pressure diesel fuel inside the diesel fuel tank 1 into the filtration module under the control of the control module.

[0041] Refer to Figure 2 , the heat transfer oil module includes a heat transfer oil tank 3 and a heat transfer oil circulation pump 36; The heat transfer oil circulation pump 36 introduces the heated heat transfer oil inside the heat transfer oil tank 3 into the outer cavity of the heavy oil tank 2 under the control of the control module to heat the low-pressure heavy oil in the inner cavity.

[0042] Refer to Figure 2, a first temperature sensor 17 is provided at the input end of the high-pressure oil supply module, a second temperature sensor 30 is provided near the second oil supply module, and a third temperature sensor 27 is provided near the heat-conducting oil module.

[0043] If the temperature value fed back by the second temperature sensor 30 is lower than the preset temperature, the control module controls the heat-conducting oil module to start and indirectly heat the low-pressure heavy oil in the second oil supply module; During the process of indirectly heating the low-pressure heavy oil in the second oil supply module, if the temperature difference between the first temperature sensor 17 and the second temperature sensor 30 exceeds the preset temperature range and the temperature fed back by the first temperature sensor 17 and / or the second temperature sensor 30 does not exceed the preset temperature, the control module controls the heat-conducting oil module to continue indirectly heating the low-pressure heavy oil in the second oil supply module; if the temperature difference between the first temperature sensor 17 and the second temperature sensor 30 is within the preset temperature range and the temperatures fed back by the first temperature sensor 17 and the second temperature sensor 30 both exceed the preset temperature, the control module controls the heat-conducting oil module to stop indirectly heating the low-pressure heavy oil in the second oil supply module; The control module identifies the real-time heating temperature of the heat-conducting oil module according to the temperature fed back by the third temperature sensor 27.

[0044] Refer to Figure 2 , a fourth temperature sensor 29 is provided near the lubricating oil module, and a fifth temperature sensor 31 is provided near the first oil supply module. According to the data of the fourth temperature sensor 29, the control module can identify whether the lubricating oil is within the normal working temperature range. According to the data of the fifth temperature sensor 31, the control module can identify whether the diesel oil is within the normal working temperature range.

[0045] Refer to Figure 2 , the control module includes a host computer 33, a PLC control system 32, various reversing valves and sensors. The host computer 33 displays a man-machine interaction interface, enabling the operator to intuitively understand the operating state of the equipment and modify corresponding parameters. The PLC control system converts the control signals from the host computer 33 into operating parameters of each device and sends them to the corresponding devices, and at the same time receives the parameter signals of each sensor and transmits them to the host computer 33. The reversing valves and sensors are terminal actuating mechanisms, which execute corresponding instructions after receiving signals and monitor important parameter information in the system.

[0046] Refer to Figure 2, in this embodiment, the circulation process of diesel is as follows: Diesel circulates inside the diesel fuel tank 1, and is pumped by the diesel low-pressure pump 6 to the fuel supply reversing valve 9, then enters the coarse filter 10 for the first filtration, and after passing through the first fine filter 13 or the fine filter element of the second filter for the second filtration, it enters the heavy oil high-pressure pump 18. After being pressurized by the heavy oil high-pressure pump 18, it enters the common rail 19, and finally is sprayed out through the electronic control injector 22 to be tested. After the flowmeter 25 reads the value, it returns to the corresponding mixing fuel tank 5 through the oil return reversing valve 26.

[0047] Refer to Figure 2 , in this embodiment, the circulation process of heavy oil is as follows: Low-pressure heavy oil circulates inside the heavy oil fuel tank 2, and is pumped by the heavy oil low-pressure pump 7 to the fuel supply reversing valve 9, then enters the coarse filter 10 for the first filtration, and after passing through the first fine filter 13 or the fine filter element of the second filter for the second filtration, it enters the heavy oil high-pressure pump 18. After being pressurized by the heavy oil high-pressure pump 18, it enters the common rail 19, and finally is sprayed out through the electronic control injector 22 to be tested. After the flowmeter 25 reads the value, it returns to the corresponding heavy oil fuel tank 2 through the oil return reversing valve 26.

[0048] The basic operation mode of the test system in this embodiment is as follows: First, start the lubricating oil circulation pump 37 and the heat-conducting oil circulation pump 36 to heat the lubricating oil, heat-conducting oil and heavy oil. After the temperatures of each fuel tank reach the corresponding requirements, the upper computer 33 selects the "heavy oil mode" to make the oil inlet reversing valve connect the heavy oil pipeline to the oil inlet, and the oil return reversing valve 26 connects the oil return pipeline to the heavy oil fuel tank 2. Start the heavy oil low-pressure pump 7, set the rotation speed of the high-pressure pump and the injection signal of the electronic control injector 22 to be tested, start the heavy oil high-pressure pump 18 and apply an electric signal to the electronic control injector 22 to be tested. After the actual rotation speed of the heavy oil high-pressure pump 18 reaches, close the start electronic control pressure relief valve, and the pressure inside the common rail 19 begins to build up. By controlling the amount of oil pumped into the common rail 19 by the heavy oil high-pressure pump 18, the rail pressure inside the common rail 19 is gradually increased to the target rail pressure and stabilized. At this time, the heavy oil test starts.

[0049] When the heavy oil test is approaching the end, turn on the diesel circulation pump 34 to circulate and heat the diesel. When the temperature reaches the specified temperature, operate the upper computer 33 to switch to the "light oil mode". The fuel supply reversing valve 9 cuts into the diesel oil pipeline, the oil return reversing valve 26 cuts into the mixing fuel tank 5, start the diesel low-pressure pump 6 and close the heavy oil low-pressure pump 7. After running in the "light oil mode" for 15 minutes, the residual heavy oil in the oil pipeline is diluted and flushed into the mixing fuel tank 5. Then gradually control the system to reduce the operating pressure to 60 Mpa, open the pneumatic control pressure relief valve 24 to release the remaining pressure, close the heavy oil high-pressure pump 18, the injector at the test port, and gradually close each circulation pump and each low-pressure pump, and close the test bench to complete the experiment.

[0050] This test system realizes the full-condition performance test and reliability test verification of the electronic control injector without heavy oil outside the engine.

[0051] Since heavy oil is an asphalt-like paste at room temperature, direct heating can cause local boiling, leading to heavy oil splashing and resulting in safety accidents. This test system indirectly heats the low-pressure heavy oil in the second fuel supply module, making the heavy oil evenly heated and avoiding safety accidents and the problem of partial evaporation of heavy oil caused by excessive local temperature.

[0052] Since heavy oil is a residual product after crude oil refining, it contains a large amount of impurities and refining catalysts, and ordinary filtration methods are extremely prone to clogging. Therefore, two-stage filtration measures are adopted. At the same time, since the common rail type 19 electronic fuel injector contains precision pairs, the fine filtration requirement is above 10um, and the fine filter element may still be clogged during the long-term verification process of the test bench. Therefore, at least two fine filters are used, and pressure sensors 21 are installed before and after each fine filter. The usage of the fine filter is determined by observing the pressure difference before and after the fine filter. When the fine filter becomes clogged, the fine filter is automatically replaced by controlling the operation of the pre-filter changeover valve 12. This method can ensure that the test does not stop for a long time due to the clogging of the fine filter, reducing the risk of heavy oil condensation caused by long-term shutdown.

[0053] This test system adopts a dual low-pressure oil circuit control, which can realize the automatic switching of the fuel medium from heavy oil to diesel. After connecting the first fuel supply module to the filtration module, diesel can be used to remove the residual heavy oil in the pipeline system, preventing the pipeline from being clogged due to condensation when the temperature drops after shutdown; at the same time, the heavy oil-diesel switching test can also be carried out to verify the performance stability of the electronic fuel injector during the fuel conversion process, further conforming to the actual situation of ship operation.

[0054] Since heavy oil is in a high-temperature state and has high corrosiveness during use, it is impossible to achieve rail pressure control through traditional PCV valve parts. Therefore, a special heavy oil high-pressure pump 18 is adopted. By monitoring the pressure in the common rail 19, the oil output of the high-pressure oil pump is automatically adjusted to achieve the dynamic balance of the oil volume entering and leaving the common rail 19, and finally achieve stable rail pressure control.

[0055] This test system adopts full-process electronic control and multi-node electronic monitoring. The entire mechanical mechanism is enclosed in a protective cover. The operator only needs to operate and monitor in the upper computer 33 of the control module, reducing the operation difficulty, reducing contact, and greatly reducing the risk during use.

[0056] It should be noted that the various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0057] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0058] It should also be noted that in this text, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. This is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the present invention. In addition, relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor can they be construed as indicating or implying relative importance. 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 comprising a series of elements does not include those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or terminal device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of additional identical elements in the process, method, article or terminal device comprising the element.

[0059] The technical solutions provided by the present invention have been introduced in detail above. Specific examples are used in this text to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only for helping to understand the present invention, and the content of this specification should not be construed as a limitation on the present invention. At the same time, for those of ordinary skill in the art, according to the present invention, there will be various forms of changes in the specific implementation manners and application scopes. It is not necessary and impossible to list all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A heavy oil electronically controlled fuel injector test system, characterized in that: include: A first fuel supply module providing low-pressure diesel, a second fuel supply module providing low-pressure heavy oil, a thermal oil module, an electronically controlled injector to be tested, a high-pressure fuel supply module, a filter module and a control module; Under the control of the control module, the second oil supply module is first connected to the filter module, and the low-pressure heavy oil in the second oil supply module is indirectly heated by the heat transfer oil module and then enters the filter module for filtration. The high-pressure oil supply module pressurizes the filtered low-pressure heavy oil to a high-pressure state for the electronically controlled injector under test to perform injection testing in a heavy oil state; After the test is completed, the control module controls the first fuel supply module to connect to the filter module, and the high-pressure fuel supply module pressurizes the filtered low-pressure diesel to a high-pressure state, and removes the residual heavy oil in the high-pressure fuel supply module and the tested electronically controlled injector.

2. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: The second oil supply module comprises a heavy oil tank (2) with an inner and outer double-layer cavity, a heavy oil circulation pump (35) and a heavy oil low-pressure pump (7); The inner cavity of the heavy oil tank (2) stores low-pressure heavy oil, and the outer cavity of the heavy oil tank (2) is connected to the heat transfer oil module. Under the control of the control module, the heat transfer oil module sends the heated heat transfer oil into the outer cavity to heat the low-pressure heavy oil. The heavy oil circulation pump (35) continuously circulates the low-pressure heavy oil in the inner cavity of the heavy oil tank (2) under the control of the control module; the heavy oil low-pressure pump (7) pumps the low-pressure heavy oil in the inner cavity of the heavy oil tank (2) into the filter module under the control of the control module.

3. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: The heavy oil electronically controlled fuel injector test system further comprises: a lubrication module; Under the control of the control module, the lubrication module lubricates the high-pressure oil supply module and the electronically controlled injector under test.

4. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: The filter module comprises: a coarse filter (10) and at least two fine filters, the coarse filter (10) and the at least two fine filters are connected via a pre-filter reversing valve (12), and both ends of each fine filter are provided with a pre-filter pressure sensor (11) and a post-filter pressure sensor (16); The control module connects one of the fine filters to the circuit by controlling the pre-filter reversing valve (12); The control module identifies whether the fine filter in the access circuit is clogged based on the pressure difference between the pre-filter pressure sensor (11) and the post-filter pressure sensor (16). If it is identified that the fine filter in the access circuit is clogged, a control module randomly selects an access circuit from the fine filters that are not clogged.

5. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: The input end of the filter module is connected to an oil supply reversing valve (9), the first oil supply module is connected to the first input end of the oil supply reversing valve (9), and the second oil supply module is connected to the second input end of the oil supply reversing valve (9); The control module selects to connect the first oil supply module or the second oil supply module to the filter module by controlling the oil supply reversing valve (9).

6. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: The heavy oil electronically controlled fuel injector test system further comprises: a mixed oil collection module; The output end of the high-pressure module and the output end of the electronically controlled fuel injector (22) to be tested are connected to a flow meter (25) and an oil return reversing valve (26); the first output end of the oil return reversing valve (26) is connected to the input end of the second fuel supply module; and the second output end of the oil return reversing valve (26) is connected to the input end of the mixed oil collection module; The control module obtains corresponding performance parameters of the electronically controlled fuel injector (22) to be tested according to the measurement by the flow meter (25); The control module controls the oil return reversing valve (26) to guide the high-pressure heavy oil released by the high-pressure oil supply module and the high-pressure heavy oil sprayed by the tested electronically controlled fuel injector into the second oil supply module, and guides the high-pressure mixed oil released by the high-pressure oil supply module and the high-pressure mixed oil sprayed by the tested electronically controlled fuel injector into the mixed oil collection module.

7. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: The high-pressure oil supply module includes: a heavy oil high-pressure pump (18), a common rail (19), a mechanical pressure gauge (20), a pressure sensor (21), a safety valve (23), and a pneumatic pressure relief valve (24); The heavy oil high-pressure pump (18) is connected to the common rail (19) through a high-pressure oil pipe, and the common rail (19) is connected to the electronically controlled fuel injector (22) to be tested through the high-pressure oil pipe; A mechanical pressure gauge (20), a pressure sensor (21), a safety valve (23) and a gas-controlled pressure relief valve (24) are installed on the common rail (19); The control module controls the balance between the amount of oil pumped into the common rail (19) by the heavy oil high-pressure pump (18) and the amount of oil discharged by the electronically controlled fuel injector (22) to be tested according to the rail pressure of the common rail (19) detected by the pressure sensor (21), thereby achieving stable oil pressure in the chamber of the common rail (19).

8. The heavy oil electronically controlled fuel injector test system according to claim 2, characterized in that: The first fuel supply module comprises a diesel tank (1), a diesel circulation pump (34) and a diesel low-pressure pump (6); The diesel circulation pump (34) continuously circulates the low-pressure diesel in the diesel tank (1) under the control of the control module; the diesel low-pressure pump (6) pumps the low-pressure diesel in the diesel tank (1) into the filter module under the control of the control module; The thermal oil module comprises a thermal oil tank (3) and a thermal oil circulation pump (36); Under the control of the control module, the heat transfer oil circulation pump (36) introduces the heat transfer oil heated inside the heat transfer oil tank (3) into the outer cavity of the heavy oil tank (2), thereby heating the low-pressure heavy oil in the inner cavity.

9. The heavy oil electronically controlled fuel injector test system according to claim 3, characterized in that: The lubrication module comprises: a lubrication oil tank (4), a lubrication oil circulation pump (37), a lubrication oil pump (8) and a cooling heat exchanger (28); The lubricating oil circulation pump (37) continuously circulates the lubricating oil in the lubricating oil tank (4) under the control of the control module; The lubricating oil in the lubricating oil tank (4) is introduced by the lubricating oil pump (8) to the heavy oil high-pressure pump (18) and the electronically controlled injector (22) to be tested for lubrication, then flows into the cooling heat exchanger (28) to exchange heat with cooling water, and then returns to the lubricating oil tank (4).

10. The heavy oil electronically controlled fuel injector test system according to claim 1, characterized in that: A first temperature sensor (17) is provided at the input end of the high-pressure oil supply module, a second temperature sensor (30) is provided at a position close to the second oil supply module, and a third temperature sensor (27) is provided at a position close to the thermal oil module; If the temperature value fed back by the second temperature sensor (30) is lower than a preset temperature, the control module controls the thermal oil module to start, and indirectly heats the low-pressure heavy oil in the second oil supply module; During the process of indirectly heating the low-pressure heavy oil in the second oil supply module, if the temperature difference between the first temperature sensor (17) and the second temperature sensor (30) exceeds a preset temperature range and the temperature fed back by the first temperature sensor (17) and / or the second temperature sensor (30) does not exceed the preset temperature, the heat transfer oil module is controlled to continue indirectly heating the low-pressure heavy oil in the second oil supply module; if the temperature difference between the first temperature sensor (17) and the second temperature sensor (30) is within the preset temperature range and the temperatures fed back by the first temperature sensor (17) and the second temperature sensor (30) both exceed the preset temperature, the heat transfer oil module is controlled to stop indirectly heating the low-pressure heavy oil in the second oil supply module; The control module identifies the real-time heating temperature of the heat transfer oil module according to the temperature fed back by the third temperature sensor (27).

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