CN111255604B - Testing device and system for dual-fuel injector - Google Patents
Testing device and system for dual-fuel injector Download PDFInfo
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- CN111255604B CN111255604B CN202010189693.9A CN202010189693A CN111255604B CN 111255604 B CN111255604 B CN 111255604B CN 202010189693 A CN202010189693 A CN 202010189693A CN 111255604 B CN111255604 B CN 111255604B
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- 239000000446 fuel Substances 0.000 title claims abstract description 243
- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 238000002347 injection Methods 0.000 claims abstract description 111
- 239000007924 injection Substances 0.000 claims abstract description 111
- 230000009977 dual effect Effects 0.000 claims abstract description 59
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 230000004044 response Effects 0.000 claims abstract description 16
- 238000012544 monitoring process Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 16
- 230000000087 stabilizing effect Effects 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 230000003993 interaction Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 47
- 230000001105 regulatory effect Effects 0.000 description 12
- 230000001276 controlling effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to the technical field of performance detection of injectors, and particularly discloses a testing device of a dual-fuel injector, which comprises the following components: the system comprises a gas injection measuring unit, a fuel injection measuring unit and a dual-fuel injector, wherein the gas injection measuring unit and the fuel injection measuring unit are connected with the dual-fuel injector; the gas injection measurement unit can filter, boost and pass through the dual-fuel injector to perform injection flow measurement and injection response measurement; the fuel injection measurement unit is capable of performing injection flow measurement and injection response measurement of fuel after passing through the dual fuel injector. The invention also discloses a testing system of the dual-fuel injector. The testing device of the dual-fuel injector provided by the invention has the advantages of simple structure and high testing efficiency.
Description
Technical Field
The invention relates to the technical field of performance detection of injectors, in particular to a testing device of a dual-fuel injector and a testing system of the dual-fuel injector comprising the testing device of the dual-fuel injector.
Background
Currently, for detecting the gas jet flow, the existing measuring method mostly adopts a volumetric method, the jetted gas is collected in a container, and the volume of the gas in the container is measured in a certain way. However, the structure of the measuring device used in this method is generally complex and the measuring efficiency is low.
Therefore, how to provide a measurement method with high efficiency and simple structure is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a testing device of a dual-fuel injector and a testing system of the dual-fuel injector comprising the testing device of the dual-fuel injector, which solve the problems of complex structure and low efficiency of a measuring device in the related technology.
As a first aspect of the present invention, there is provided a test apparatus for a dual fuel injector, comprising: the system comprises a gas injection measuring unit, a fuel injection measuring unit and a dual-fuel injector, wherein the gas injection measuring unit and the fuel injection measuring unit are connected with the dual-fuel injector;
The gas injection measuring unit can filter air and perform injection quantity flow after the air passes through the dual-fuel injector;
the fuel injection measurement unit is capable of measuring an injection amount of fuel after the fuel passes through the dual fuel injector.
Further, the gas injection measurement unit includes: a C-stage filter, a T-stage filter, a dryer, a A-stage filter, a first electric control stop valve, a booster pump, a first pressure container, a second pressure container, a first heater, a second electric control stop valve, a second heater, a first steady flow tank, a flowmeter and a second steady flow tank,
The inlet of the C-stage filter is used for flowing in air, the outlet of the C-stage filter is respectively connected with the T-stage filter and the first electric control stop valve, and the C-stage filter is used for coarsely filtering the air;
the outlet of the T-stage filter is connected with the dryer, and the T-stage filter is used for finely filtering air after the C-stage filter is subjected to coarse filtration;
the outlet of the dryer is connected with the A-stage filter, and the dryer is used for removing water vapor in the air filtered by the C-stage filter;
The outlet of the A-stage filter is connected with the booster pump, and the A-stage filter is used for carrying out high-precision filtration on air at the outlet of the dryer;
the outlet of the first electric control stop valve is connected with the booster pump, and the first electric control stop valve controls the on-off of a power air source of the booster pump;
the outlet of the booster pump is connected with the first pressure container, and the booster pump is used for boosting the air filtered by the A-stage filter;
The first pressure container is used for storing air after the booster pump is pressurized;
The second pressure container is connected with the outlet of the first pressure container, a pressure reducing valve is arranged between the first pressure container and the second pressure container, and the second pressure container is used for storing air decompressed by the pressure reducing valve;
The first heater is connected with the pressure reducing valve and is used for heating the air decompressed by the pressure reducing valve;
the second electric control stop valve is connected with the outlet of the first heater and is used as an emergency stop switch;
The outlet of the second electric control stop valve is connected with the gas inlet of the dual-fuel injector;
the second heater is connected with a gas outlet of the dual-fuel injector and is used for heating air sprayed out of the dual-fuel injector;
The first steady flow tank is connected with the outlet of the second heater and is used for carrying out first steady flow on air sprayed by the dual-fuel injector;
The flowmeter is connected with the outlet of the first steady flow tank and is used for monitoring the flow of the air stabilized by the first steady flow tank;
The second steady flow tank is connected with the flowmeter and is used for carrying out second steady flow on the air after the steady flow of the first steady flow tank.
Further, the outlet of the booster pump is provided with a first safety valve, and the first safety valve is used for controlling the air pressure of the outlet of the booster pump.
Further, a first pressure gauge is arranged at the inlet of the first pressure container, a booster pump outlet air pressure monitoring point is arranged adjacent to the first pressure gauge, and the first pressure gauge is used for detecting booster pump outlet air pressure; a first pressure container outlet air pressure monitoring point and a first pressure container outlet temperature monitoring point are arranged at the outlet of the first pressure container; and the inlet of the second pressure container is provided with a second pressure gauge for monitoring the inlet air pressure entering the second pressure container.
Further, the inlet of the first heater is provided with a second safety valve, the second safety valve is used for controlling the pressure of air entering the first heater, and the outlet of the first heater is provided with a heater outlet temperature monitoring point.
Further, a gas inlet of the dual-fuel injector is provided with a gas inlet pressure monitoring point of the dual-fuel injector, and a gas outlet of the dual-fuel injector is provided with a gas outlet pressure monitoring point of the dual-fuel injector.
Further, the gas injection measurement unit further comprises a pressure stabilizing cavity, wherein the pressure stabilizing cavity is connected with a gas outlet of the dual-fuel injector and is used for measuring the gas injection flow of the dual-fuel injector; and the pressure stabilizing cavity is provided with a pressure stabilizing cavity air pressure monitoring point and a pressure stabilizing cavity temperature monitoring point.
Further, the fuel injection measurement unit comprises a fuel rail and a fuel injector, wherein the fuel rail and the fuel injector are connected with the dual-fuel injector, fuel entering from an inlet of the fuel rail is injected into the fuel injector through the dual-fuel injector, the fuel injector is used for measuring fuel injection flow and injection response of fuel injected by the dual-fuel injector, collecting fuel injection data in a testing device of the dual-fuel injector, and sending the collected fuel injection data to the industrial personal computer.
As another aspect of the present invention, there is provided a test system for a dual fuel injector, comprising an ECU, an industrial personal computer, an oil pressure control unit, an air pressure control unit, a collection device and the test device for a dual fuel injector described above, wherein the air pressure control unit, the collection device, the ECU and the oil pressure control unit are all in communication connection with the industrial personal computer,
The air pressure control unit is used for collecting air pressure and temperature data in a testing device of the dual-fuel injector;
the acquisition device is used for acquiring gas injection data in the testing device of the dual-fuel injector and electromagnetic valve current data of the dual-fuel injector;
When the fuel injection measuring unit in the testing device of the dual-fuel injector comprises a fuel injector, the fuel injector is used for collecting fuel injection data in the testing device of the dual-fuel injector; the industrial personal computer is used for respectively processing the gas injection data, the fuel injection data and the electromagnetic valve current data of the dual-fuel injector;
the oil pressure control unit is used for controlling the oil inlet pressure of the dual-fuel injector in the testing device of the dual-fuel injector according to the set value of the man-machine interaction interface of the industrial personal computer;
The ECU is used for controlling the gas injection process of the dual-fuel injector in the testing device of the dual-fuel injector according to the set value of the man-machine interaction interface of the industrial personal computer;
The air pressure control unit is also used for controlling the air injection process of the dual-fuel injector in the testing device of the dual-fuel injector according to the processing result of the industrial personal computer on the air injection data.
Further, the acquisition device comprises an NI high-speed data acquisition card, and the air pressure control unit comprises a PLC controller.
According to the testing device of the dual-fuel injector, provided by the embodiment of the invention, the measurement of the injection flow and the injection response of gas is realized through the gas injection measuring unit, the fuel injection measuring unit and the dual-fuel injector, and meanwhile, the measurement of the fuel injection flow and the fuel injection response can also be realized.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
Fig. 1 is a schematic structural diagram of a testing device of a dual fuel injector according to the present invention.
Fig. 2 is a schematic diagram of the electrical control principle provided by the invention.
Fig. 3 is a schematic structural diagram of a test system of a dual fuel injector according to the present invention.
Fig. 4 is a specific workflow diagram of a test system for a dual fuel injector provided by the present invention.
Reference numerals:
1. A class C filter; 2. a T-stage filter; 3. a dryer; 4. a class A filter; 5. a first electrically controlled shut-off valve; 15. the second electric control stop valve; 6. a booster pump; 7. a first safety valve; 12. a second safety valve; 8. a first pressure gauge; 13. a second pressure gauge; 9. a first pressure vessel; 11. a second pressure vessel; 10. a pressure reducing valve; 14. a first heater; 17. a second heater; 16. a dual fuel injector; 18. a first steady flow tank; 20. a second steady flow tank; 19. a flow meter; 21. a back pressure valve; 22. a pressure stabilizing cavity; 23. an oil rail; 24. a fuel injector; 25. a first stop valve; 26. a second shut-off valve; 27. a third stop valve; p01, booster pump outlet air pressure; p02, the outlet air pressure of the first pressure container 9; p03, inlet air pressure of the dual fuel injector; p04, pressure stabilizing cavity air pressure; p05, rail pressure; p06, outlet air pressure of the dual fuel injector; t01, the outlet temperature of the first pressure vessel 9; t02, heater outlet temperature; t03, temperature of the pressure stabilizing cavity; f01, flow meter; SB1, emergency stop switch; b1, KV1 and an electric control stop valve are opened in place; b2, KV2 and an electric control stop valve are closed in place; a01, a02, dual fuel injector solenoid current.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a testing device of a dual fuel injector is provided, fig. 1 is a schematic structural diagram of the testing device of the dual fuel injector according to an embodiment of the present invention, as shown in fig. 1, including: the system comprises a gas injection measuring unit, a fuel injection measuring unit and a dual-fuel injector, wherein the gas injection measuring unit and the fuel injection measuring unit are connected with the dual-fuel injector;
The gas injection measuring unit can filter air and perform injection quantity flow after the air passes through the dual-fuel injector;
the fuel injection measurement unit is capable of measuring an injection amount of fuel after the fuel passes through the dual fuel injector.
According to the testing device of the dual-fuel injector, provided by the embodiment of the invention, the measurement of the injection flow and the injection response of gas is realized through the gas injection measuring unit, the fuel injection measuring unit and the dual-fuel injector, and meanwhile, the measurement of the fuel injection flow and the fuel injection response can also be realized.
Specifically, as shown in fig. 1, the gas injection measurement unit includes: a C-stage filter 1, a T-stage filter 2, a dryer 3, a A-stage filter 4, a first electrically controlled stop valve 5, a booster pump 6, a first pressure vessel 9, a second pressure vessel 11, a first heater 14, a second electrically controlled stop valve 15, a second heater 17, a first steady flow tank 18, a flowmeter 19 and a second steady flow tank 20,
The inlet of the C-stage filter 1 is used for flowing in air, the outlet of the C-stage filter 1 is respectively connected with the T-stage filter 2 and the first electric control stop valve 5, and the C-stage filter 1 is used for coarsely filtering the air;
It should be noted that, the inlet of the C-stage filter is filled with compressed air, i.e. a low-pressure air source, and the pressure is 6-8 bar, which is uniformly supplied by a power station room in a factory where a laboratory is located, and the pressure is used as the power of the booster pump to drive the booster pump to work (1-5-6, the flow is about 3m 3/min), and the pressure is increased from low pressure to high pressure (1-2-3-4-6, the flow is about 0.25m 3/min).
Wherein the C-stage filter 1 is used for rough filtration, the filtering precision is 3 mu m, and liquid and solid impurities in the compressed air are preliminarily filtered.
The outlet of the T-stage filter 2 is connected with the dryer 3, and the T-stage filter 2 is used for finely filtering air after the C-stage filter 1 is coarsely filtered;
The T-stage filter 2 was fine-filtered, and the filtration grade was 1. Mu.m.
The outlet of the dryer 3 is connected with the A-stage filter 4, and the dryer 3 is used for removing water vapor in the air filtered by the C-stage filter 1;
The micro-thermal regeneration adsorption dryer 3 removes water vapor in the compressed air and reduces the water content in the compressed air to below the normal pressure dew point of-70 ℃.
The outlet of the A-stage filter 4 is connected with the booster pump 6, and the A-stage filter 4 is used for carrying out high-precision filtration on air at the outlet of the dryer 3;
the A-stage filter 4 was a high-definition filter with a filter rating of 0.01. Mu.m.
The outlet of the first electric control stop valve 5 is connected with the booster pump 6, and the first electric control stop valve 5 controls the on-off of a power air source of the booster pump 6;
The first electric control stop valve 5 can control the on-off of a power air source of the air-driven booster pump 6, and when the air-driven booster pump works normally, the control system automatically closes the valve when the rear-end pressure container reaches the set pressure, so that the booster pump stops working; in addition, the valve is used as a scram switch, and when an abnormal condition occurs, an operator manually presses down the scram switch to stop the valve or the control system brakes to stop the valve.
The outlet of the booster pump 6 is connected with the first pressure container 9, and the booster pump 6 is used for boosting the air filtered by the A-stage filter 4;
the booster pump 6 is a booster pump driven by compressed air, and can boost air from 8bar pressure to 400bar pressure.
The first pressure container 9 is used for storing air after being pressurized by the booster pump 6;
in particular, the first pressure vessel 9 is capable of high pressure (400 bar) compressed air storage vessel, volume 400L.
The second pressure container 11 is connected with the outlet of the first pressure container 9, a pressure reducing valve 10 is arranged between the first pressure container 9 and the second pressure container 11, and the second pressure container 11 is used for storing air decompressed by the pressure reducing valve 10;
specifically, the volume of the second pressure container 11 is 50L, and the main function is to store energy, so as to ensure the stability of the gas inlet pressure of the test sample 16 (dual fuel injector).
The first heater 14 is connected to the pressure reducing valve 10, and the first heater 14 is used for heating the air depressurized by the pressure reducing valve 10;
After the high-pressure air of the first heater 14 is depressurized by the depressurization valve 10, the temperature is lower than the gas fuel inlet temperature requirement of the test sample (dual fuel injector 16), so that the heating is performed by using the heater, and the heating is performed in a water bath through a coil, and the temperature is controlled to be about 40 ℃.
It should be noted that the pressure reducing valve 10 is capable of regulating the outlet high pressure gas of the first pressure vessel 9 to a range of 80bar to 350bar, which is also the gas fuel inlet pressure requirement of the test sample (dual fuel injector 16).
The second electrically controlled stop valve 15 is connected with the outlet of the first heater 14 and is used as an emergency stop switch;
It should be noted that, the second electrically controlled stop valve 15 is used as a scram switch, and an operator presses the scram switch to close the valve in the emergency, or the test system automatically closes the valve in the emergency, so as to prevent the high-pressure gas from damaging personnel and equipment in the operation area in the abnormal situation.
An outlet of the second electrically controlled stop valve 15 is connected with a gas inlet of the dual fuel injector 16;
it should be noted that the dual fuel injector 16 is an injector using diesel and natural gas as fuel, and the rated inlet pressure of diesel and natural gas is 300bar, and the embodiment of the present invention uses air instead of natural gas as a test medium for safety.
The second heater 17 is connected with a gas outlet of the dual-fuel injector 16, and the second heater 17 is used for heating air sprayed by the dual-fuel injector 16;
The second heater 17 functions in the same manner as the first heater 14, and the gas having a pressure of 350bar is injected through the test piece (dual fuel injector 16) to become low-pressure and low-temperature gas, so that it is necessary to perform flow measurement after heating to normal temperature.
The first steady flow tank 18 is connected with the outlet of the second heater 17 and is used for carrying out first steady flow on air sprayed by the dual-fuel injector 16;
it should be noted that, the test sample (dual fuel injector 16) is a pulsating injection, so the pressure flow at the rear end is pulsating, the flow meter is subject to a response speed, and the pulsating flow cannot be measured well, so the pulsating flow is rectified into a stable flow by using the first flow stabilizing tank 18 and the second flow stabilizing tank 20, so that the accurate measurement of the flow meter 19 is facilitated.
The flowmeter 19 is connected with the outlet of the first steady flow tank 18 and is used for monitoring the flow of the air stabilized by the first steady flow tank 18;
the second steady flow tank 20 is connected to the flowmeter 19, and is used for performing a second steady flow on the air after the steady flow of the first steady flow tank 18.
Specifically, a first relief valve 7 is provided at the outlet of the booster pump 6, and the first relief valve 7 is used to control the air pressure at the outlet of the booster pump 6.
The opening pressure of the first safety valve 7 is 420bar, so that the working pressure of the back-end pipeline is ensured not to exceed 420bar.
Specifically, a first pressure gauge 8 is arranged at the inlet of the first pressure container 9, a booster pump outlet air pressure monitoring point P01 is arranged adjacent to the first pressure gauge 8, and the first pressure gauge 8 is used for detecting the outlet air pressure of the booster pump 6; a first pressure container outlet air pressure monitoring point P02 and a first pressure container outlet temperature monitoring point T01 are arranged at the outlet of the first pressure container 9; the inlet of the second pressure vessel 11 is provided with a second pressure gauge 13 for monitoring the inlet air pressure into the second pressure vessel 11.
Specifically, the inlet of the first heater 14 is provided with a second safety valve 12, the second safety valve 12 is used for controlling the air pressure entering the first heater 14, and the outlet of the first heater 14 is provided with a heater outlet temperature monitoring point T02.
Specifically, a dual-fuel injector inlet air pressure monitoring point P03 is set at the air inlet of the dual-fuel injector 16, and a dual-fuel injector outlet air pressure monitoring point P06 is set at the air outlet of the dual-fuel injector 16.
Specifically, the gas injection measurement unit further comprises a regulated pressure chamber 22, wherein the regulated pressure chamber 22 is connected with a gas outlet of the dual fuel injector 16 and is used for measuring the gas injection flow rate of the dual fuel injector; the pressure stabilizing cavity 22 is provided with a pressure stabilizing cavity air pressure monitoring point P03 and a pressure stabilizing cavity temperature monitoring point T04.
Specifically, the fuel injection measurement unit includes a fuel rail 23 and a fuel injector 24, where the fuel rail 23 and the fuel injector 24 are both connected to the dual fuel injector 16, fuel entering at an inlet of the fuel rail 23 is injected into the fuel injector 24 through the dual fuel injector 16, and the fuel injector 24 is used for measuring fuel injection flow and injection response of fuel injected by the dual fuel injector, collecting fuel injection data in a testing device of the dual fuel injector, and sending the collected fuel injection data to an industrial personal computer.
It should be appreciated that the high pressure oil source is capable of providing a source of oil at a pressure of 300 bar. Specifically, the high-pressure oil source unit comprises an oil tank, an oil pump and an independent control system.
Specifically, the oil rail 23 stores energy for the oil source to stabilize the inlet oil pressure of the test sample (dual fuel injector 16).
As shown in fig. 1, the gas injection measurement unit further includes: back pressure valve 21, first shut-off valve 25, second shut-off valve 26 and third shut-off valve 27. The back pressure valve 21 is arranged at the outlet of the second steady flow tank 20 and is used for adjusting the pipeline pressure from the dual fuel injector 16 to the back pressure valve 21 to be in the pressure measurement range of the flowmeter 19. The first stop valve 25 is disposed at an inlet position of the second heater, the second stop valve 26 is disposed at an inlet of the regulated chamber, and the third stop valve 27 is disposed at an outlet of the regulated chamber 22. The first 25, second 26 and third 27 shut-off valves may each be closed by manual closing of the piping there.
The operation of the testing device for dual fuel injectors according to the embodiment of the present invention will be described in detail with reference to fig. 1.
When the compressed air with the pressure of 8bar is filtered by the C-level filter 1, the compressed air is divided into two paths, one path of the compressed air passes through the electric control stop valve 5 and then is used as power to drive the booster pump 6 to work, and the other path of the compressed air passes through the T-level filter 2, the dryer 3 and the A-level filter 4 and then becomes high-purity air, and the high-purity air is pressurized by the booster pump 6 to be high-pressure compressed air;
The high-pressure compressed air is stored in the pressure container 9, and the control system automatically controls the starting and stopping of the booster pump 6 through a P02 pressure signal and switching signals B1 and B2 of the electric control stop valve 5;
The high pressure compressed air in the pressure vessel 9 is regulated via a pressure relief valve 10 and a heater 14 to air at a pressure and temperature required for operation of the dual fuel injector 16, the pressure and temperature being measured by P03 and T02;
The electric control stop valve 15 can realize automatic control of high-pressure air intake of the dual-fuel injector 16 and emergency stop in emergency;
The air jet flow measuring method comprises the following steps: the dual fuel injector 16 injects high-pressure normal-temperature air into low-pressure low-temperature pulsating air flow, the low-pressure normal-temperature pulsating air flow is heated by the heater 17, and a low-pressure normal-temperature stable flow field is obtained at the flowmeter 21 under the steady flow action of the steady flow tank 18 and the steady flow tank 20 before and after the flowmeter 19, so that the measuring precision of the flowmeter can be improved;
And a second air jet flow measuring method: the dual fuel injector 16 injects air into the regulated pressure chamber 22, and injection flow can be calculated by regulating pressure P04 of the regulated pressure chamber, temperature T03 of the regulated pressure chamber and volume of the regulated pressure chamber before and after injection;
the fuel injection measuring method comprises the following steps: the high-pressure fuel source is used for conveying diesel oil to the fuel rail 23, the pressure of the fuel rail 23 is controlled by a P05 pressure signal and an oil pressure control unit, and the high-pressure diesel oil is injected into the fuel injector 24 through the dual-fuel injector to measure the fuel injection flow and the injection response;
the pressure at the flow meter 19 is regulated by a back pressure valve 21;
The safety pressure of each section of pipeline of the measuring system is ensured by a first safety valve 7 and a second safety valve 12.
As another embodiment of the present invention, there is provided a test system for a dual fuel injector, wherein, as shown in fig. 3 and 4, an ECU, an industrial personal computer, an oil pressure control unit, an air pressure control unit, a collecting device and the test device for a dual fuel injector described above, the air pressure control unit, the collecting device, the ECU and the oil pressure control unit are all in communication connection with the industrial personal computer,
The air pressure control unit is used for collecting air pressure and temperature data (particularly low-speed signals) in a testing device of the dual-fuel injector;
The acquisition device is used for acquiring gas injection data in the testing device of the dual-fuel injector and electromagnetic valve current data (particularly high-speed signals) of the dual-fuel injector;
When the fuel injection measurement unit in the testing device of the dual fuel injector comprises a fuel injector, the fuel injector is used for collecting fuel injection data (particularly high-speed signals) in the testing device of the dual fuel injector; the industrial personal computer is used for respectively processing the gas injection data, the fuel injection data and the electromagnetic valve current data of the dual-fuel injector;
the oil pressure control unit is used for controlling the oil inlet pressure of the dual-fuel injector in the testing device of the dual-fuel injector according to the set value of the man-machine interaction interface of the industrial personal computer;
The ECU is used for controlling the gas injection process of the dual-fuel injector in the testing device of the dual-fuel injector according to the set value of the man-machine interaction interface of the industrial personal computer;
The air pressure control unit is also used for controlling the air injection process of the dual-fuel injector in the testing device of the dual-fuel injector according to the processing result of the industrial personal computer on the air injection data.
The testing system of the dual-fuel injector provided by the embodiment of the invention adopts the testing device of the dual-fuel injector, realizes the measurement of the injection flow and the injection response of gas through the gas injection measuring unit, the fuel injection measuring unit and the dual-fuel injector, and simultaneously can realize the measurement of the fuel injection flow and the fuel injection response.
Preferably, the acquisition device comprises an NI high-speed data acquisition card, and the air pressure control unit comprises a PLC controller.
It will be appreciated that the electrical control schematic diagram of the test system of the dual fuel injector is shown in fig. 2. As can be seen from fig. 2, the parameters of the gas injection measurement units are all collected by the PLC controller, and the gas injection response measurement parameters are collected by the NI high-speed acquisition card. When the same signal is required to be collected by the PLC and the NI high-speed collection card at the same time, the signal isolation grating is used for dividing the signal into two paths of signals, and the signals are respectively connected into the PLC for collection and the NI high-speed collection card for collection, (such as P05 oil rail pressure and P06 injector outlet air pressure).
The air pressure control unit, the fuel injector and the acquisition device are all connected with the industrial personal computer through the Ethernet switch.
The specific working principle of the testing system of the dual fuel injector provided by the embodiment of the present invention may refer to the description of the testing device of the dual fuel injector, and will not be repeated here.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (7)
1. A test apparatus for a dual fuel injector, comprising: the system comprises a gas injection measuring unit, a fuel injection measuring unit and a dual-fuel injector, wherein the gas injection measuring unit and the fuel injection measuring unit are connected with the dual-fuel injector;
The gas injection measurement unit can filter, boost and pass through the dual-fuel injector to perform injection flow measurement and injection response measurement;
the fuel injection measuring unit can measure injection flow and injection response of fuel after passing through the dual-fuel injector;
The gas injection measurement unit includes: a C-stage filter, a T-stage filter, a dryer, a A-stage filter, a first electric control stop valve, a booster pump, a first pressure container, a second pressure container, a first heater, a second electric control stop valve, a second heater, a first steady flow tank, a flowmeter and a second steady flow tank,
The inlet of the C-stage filter is used for flowing in air, the outlet of the C-stage filter is respectively connected with the T-stage filter and the first electric control stop valve, and the C-stage filter is used for coarsely filtering the air;
the outlet of the T-stage filter is connected with the dryer, and the T-stage filter is used for finely filtering air after the C-stage filter is subjected to coarse filtration;
the outlet of the dryer is connected with the A-stage filter, and the dryer is used for removing water vapor in the air filtered by the C-stage filter;
The outlet of the A-stage filter is connected with the booster pump, and the A-stage filter is used for carrying out high-precision filtration on air at the outlet of the dryer;
the outlet of the first electric control stop valve is connected with the booster pump, and the first electric control stop valve controls the on-off of a power air source of the booster pump;
the outlet of the booster pump is connected with the first pressure container, and the booster pump is used for boosting the air filtered by the A-stage filter;
The first pressure container is used for storing air after the booster pump is pressurized;
The second pressure container is connected with the outlet of the first pressure container, a pressure reducing valve is arranged between the first pressure container and the second pressure container, and the second pressure container is used for storing air decompressed by the pressure reducing valve;
The first heater is connected with the pressure reducing valve and is used for heating the air decompressed by the pressure reducing valve;
the second electric control stop valve is connected with the outlet of the first heater and is used as an emergency stop switch;
The outlet of the second electric control stop valve is connected with the gas inlet of the dual-fuel injector;
the second heater is connected with a gas outlet of the dual-fuel injector and is used for heating air sprayed out of the dual-fuel injector;
The first steady flow tank is connected with the outlet of the second heater and is used for carrying out first steady flow on air sprayed by the dual-fuel injector;
The flowmeter is connected with the outlet of the first steady flow tank and is used for monitoring the flow of the air stabilized by the first steady flow tank;
The second steady flow tank is connected with the flowmeter and is used for carrying out second steady flow on the air after steady flow of the first steady flow tank;
A first pressure gauge is arranged at the inlet of the first pressure container, a booster pump outlet air pressure monitoring point is arranged adjacent to the first pressure gauge, and the first pressure gauge is used for detecting booster pump outlet air pressure; a first pressure container outlet air pressure monitoring point and a first pressure container outlet temperature monitoring point are arranged at the outlet of the first pressure container; the inlet of the second pressure container is provided with a second pressure gauge for monitoring the inlet air pressure entering the second pressure container;
The inlet of the first heater is provided with a second safety valve, the second safety valve is used for controlling the air pressure entering the first heater, and the outlet of the first heater is provided with a heater outlet temperature monitoring point.
2. The dual fuel injector test apparatus of claim 1, wherein the booster pump outlet is provided with a first relief valve for controlling air pressure at the booster pump outlet.
3. The dual fuel injector testing apparatus of claim 1, wherein a dual fuel injector inlet gas pressure monitoring point is provided at a gas inlet of the dual fuel injector and a dual fuel injector outlet gas pressure monitoring point is provided at a gas outlet of the dual fuel injector.
4. The test device of a dual fuel injector of claim 1, wherein the gas injection measurement unit further comprises a plenum connected to a gas outlet of the dual fuel injector for measuring a gas injection flow rate of the dual fuel injector; and the pressure stabilizing cavity is provided with a pressure stabilizing cavity air pressure monitoring point and a pressure stabilizing cavity temperature monitoring point.
5. The test device of a dual fuel injector according to any one of claims 1 to 4, wherein the fuel injection measurement unit comprises a fuel rail and a fuel injector, the fuel rail and the fuel injector are both connected with the dual fuel injector, fuel entering from an inlet of the fuel rail is injected into the fuel injector through the dual fuel injector, the fuel injector is used for measuring fuel injection flow and injection response of fuel injected by the dual fuel injector, and is used for collecting fuel injection data in the test device of the dual fuel injector and sending the collected fuel injection data to an industrial control computer.
6. A test system of a dual fuel injector is characterized by comprising an ECU, an industrial personal computer, an oil pressure control unit, an air pressure control unit, a collecting device and the test device of the dual fuel injector according to any one of claims 1 to 5, wherein the air pressure control unit, the collecting device, the ECU and the oil pressure control unit are all in communication connection with the industrial personal computer,
The air pressure control unit is used for collecting air pressure and temperature data in a testing device of the dual-fuel injector;
the acquisition device is used for acquiring gas injection data in the testing device of the dual-fuel injector and electromagnetic valve current data of the dual-fuel injector;
When the fuel injection measuring unit in the testing device of the dual-fuel injector comprises a fuel injector, the fuel injector is used for collecting fuel injection data in the testing device of the dual-fuel injector; the industrial personal computer is used for respectively processing the gas injection data, the fuel injection data and the electromagnetic valve current data of the dual-fuel injector;
the oil pressure control unit is used for controlling the oil inlet pressure of the dual-fuel injector in the testing device of the dual-fuel injector according to the set value of the man-machine interaction interface of the industrial personal computer;
The ECU is used for controlling the gas injection process of the dual-fuel injector in the testing device of the dual-fuel injector according to the set value of the man-machine interaction interface of the industrial personal computer;
The air pressure control unit is also used for controlling the air injection process of the dual-fuel injector in the testing device of the dual-fuel injector according to the processing result of the industrial personal computer on the air injection data.
7. The dual fuel injector test system of claim 6, wherein the acquisition device comprises an NI high speed data acquisition card and the air pressure control unit comprises a PLC controller.
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