CN112284739A - Zero-rotation-speed oil sprayer testing method for engine cold test - Google Patents
Zero-rotation-speed oil sprayer testing method for engine cold test Download PDFInfo
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- CN112284739A CN112284739A CN202011103553.1A CN202011103553A CN112284739A CN 112284739 A CN112284739 A CN 112284739A CN 202011103553 A CN202011103553 A CN 202011103553A CN 112284739 A CN112284739 A CN 112284739A
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Abstract
The invention discloses a zero-rotating-speed oil sprayer testing method for cold test of an engine, which comprises the following steps: 1. the engine is butted with a cold test bench to start a cold test; 2. in the final stage of the cold test, the rotating speed of the engine is reduced to 0RPM, and the rail pressure of the engine is relieved; 3. detecting whether the rail pressure of the engine is reduced to a fuel injector test trigger value, if so, executing the step 4, and if not, continuing to detect; 4. the cold test rack supplies power to the oil injector, and the rail pressure of the engine is reduced in a stepped manner; 5. and after the power supply of all the oil injectors is finished, ending the oil injector test and displaying the rail pressure test curve. The method disclosed by the invention is used for testing under the condition of zero rotating speed of the cold test of the engine, so that the fuel sprayed by the fuel injector in the test is prevented from polluting the environment, the compression ignition of the engine and the frequent disconnection of the safety clutch of the equipment caused by the residual fuel in the combustion chamber of the engine are avoided, and the consistency of the repeated test of the cold test fuel injector of the engine is improved.
Description
Technical Field
The invention relates to an engine cold test method, in particular to a zero-rotating-speed oil sprayer test method for engine cold test.
Background
In the field of modern engine production and manufacturing, the advantages of fast testing beat, low environmental pollution and the like of engine cold test become more and more important in the aspect of factory detection of an engine production line. The oil injector is used as an important part of the engine, influences the overall performance and even safety of the engine, and is also used as one of the detection contents of the conventional cold test bench.
In the prior art, the test method of the cold-test fuel injector of the engine is that a rack supplies power to the fuel injector to open the fuel injector when the engine rotates, for example, the rotating speed of the engine is 300RPM, and the rail pressure sensor of the engine detects the pressure value and the slope of the rail pressure reduction of the fuel common rail so as to detect whether the electrical and mechanical characteristics of the fuel injector are normal or not, thereby ensuring the delivery quality of the engine. Because the engine does not ignite in cold test, part of fuel oil injected into a combustion chamber of the engine by opening the fuel injector is discharged into the air along with the air inlet and exhaust strokes of the engine, and environmental pollution is caused. And part of fuel oil exists in a combustion chamber of the engine, so that the fuel oil is easily subjected to compression ignition in the next compression stroke of the engine, the ignition of the engine is caused, the operation torque is increased instantly, and the safety clutch of the equipment is disengaged and even the main servo motor of the equipment is damaged. Meanwhile, when the engine is tested by the oil sprayer, the high-pressure oil pump can be driven to rotate and continuously supply oil to the high-pressure oil rail, so that the oil rail oil pressure change has no obvious rule, the consistency of a plurality of test results of the same engine oil sprayer is poor, for example, a 4-cylinder diesel engine is taken, the extreme difference of the 4-cylinder pressure test result can reach 350Bar, and the defect detection capability is low.
Disclosure of Invention
The invention aims to provide a zero-rotation-speed oil sprayer testing method for engine cold test, which is used for testing an oil sprayer under the condition of zero rotation speed of the engine cold test, so that the environment pollution caused by fuel oil sprayed by the oil sprayer test is avoided, the problems of engine compression ignition, frequent disconnection of a safety clutch of equipment and the like caused by residual fuel oil in an engine combustion chamber are also avoided, and the consistency of repeated tests of the engine cold test oil sprayer is also improved.
The invention is realized by the following steps:
a zero-rotation-speed fuel injector testing method for engine cold test comprises the following steps:
step 1: butting the engine with a cold test bench, dragging the engine to rotate by the bench, and starting a cold test;
step 2: at the final stage of the cold test of the engine, the rotating speed of the engine is reduced to 0RPM, and the rail pressure of the engine begins to naturally release pressure;
and step 3: the cold test bench detects the rail pressure of the engine in real time through an engine rail pressure sensor, judges whether the rail pressure of the engine is reduced to a fuel injector test trigger value or not, if so, executes the step 4, starts the fuel injector test, otherwise, continues to detect the rail pressure of the engine until the rail pressure of the engine is reduced to the fuel injector test trigger value, and executes the step 4;
and 4, step 4: the cold test rack supplies power to the oil injector, so that the oil injector is opened and fuel oil in the fuel oil common rail is injected into a combustion chamber of the engine, and the rail pressure of the engine is further reduced;
and 5: and after the cold test rack supplies power to all the oil injectors, the test on the oil injectors is finished, and a rail pressure test curve is displayed through a display screen of the cold test rack.
The fuel injector test trigger value is a trigger value calibrated in the development stage of the tested engine.
During the cold test of the diesel engine, the test trigger value of the oil injector is set to be 1200-1800Bar, and during the cold test of the gasoline engine, the test trigger value of the oil injector is set to be 120-180 Bar.
The cold test bench sequentially supplies power to a plurality of fuel injectors of the engine, so that the plurality of fuel injectors are sequentially opened, and the rail pressure of the engine is reduced in a step shape.
The cold test bench supplies power to any two adjacent oil injectors at equal time intervals, namely the cold test bench supplies power to a plurality of oil injectors at equal time intervals, and the time intervals are 80-200 ms.
The period of time for powering on the last oil sprayer is equivalent to the time interval for powering on the cold test bench and is 80-200 ms.
Repeating the steps 1 to 5, carrying out a plurality of times of fuel injector tests on the same engine, and displaying a rail pressure test superposition curve through a display screen of a cold test bench; in the rail pressure test superposition curve, the pressure range difference between adjacent rail pressure test curves does not exceed 30 Bar.
The rail pressure test curve is a stepped curve, and the number of steps is equal to that of the oil injectors.
Compared with the prior art, the invention has the following beneficial effects:
1. the fuel injector test is carried out at the final stage of the cold test of the engine, namely the test is carried out under the condition of zero rotating speed when the engine stops rotating, at the moment, the engine does not have corresponding strokes of air intake, air exhaust and the like, and fuel (and fuel mixture) injected into a combustion chamber is not discharged along with the rotation of the engine.
2. The fuel injector test is carried out at the final stage of the cold test of the engine, namely the test is carried out under the condition of zero rotating speed when the engine stops rotating, the engine does not have compression and work doing actions, and fuel (and fuel mixed gas) injected into a combustion chamber does not have a pressure combustion risk.
3. The engine is kept not to rotate in the testing process, so that the high-pressure oil pump does not supply oil to the oil rail, the stability of the oil rail oil pressure is kept, compared with the traditional oil injector testing process method, the system error caused by the testing method can be reduced, and the consistency of the oil injector testing curve of repeated testing is improved.
The invention carries out the fuel injector test at the final stage of the cold test of the engine, namely, under the condition of zero rotating speed of the engine, the cold test rack supplies power to the fuel injector and carries out the fuel injector test, thereby avoiding the environment pollution of fuel sprayed by the fuel injector test, avoiding the problems of engine compression ignition, frequent disconnection of an equipment safety clutch and the like caused by residual fuel in a combustion chamber of the engine, improving the consistency of the repeated test of the cold test fuel injector of the engine, and being beneficial to detecting the electrical and mechanical characteristics of the fuel injector through the pressure drop value and the slope of the common rail pressure of the fuel rail.
Drawings
FIG. 1 is a flow chart of a zero speed fuel injector testing method of the present invention for cold testing of an engine;
FIG. 2 is a graph of engine rail pressure versus rotational speed for the zero speed injector test method of engine cold testing of the present invention;
FIG. 3 is a graph of a fuel injector test curve obtained from a test using the zero speed fuel injector test method of the engine cold test of the present invention;
FIG. 4 is a superimposed graph of injector test curves for repeated tests of the same engine using the zero speed injector test method of engine cold testing of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a method for testing a zero-speed injector for cold test of an engine includes the following steps:
step 1: and butting the engine with a cold test bench, and dragging the engine to rotate by the bench to start cold test. The cold test of the engine is the prior art, and the adopted cold test bench is also the existing test equipment matched with the tested engine, and the details are not repeated here.
Please refer to fig. 2, step 2: at the final stage of the cold test of the engine, the rotating speed of the engine is reduced to 0RPM, and the rail pressure of the engine begins to be naturally released. The engine is not ignited in the cold test stage, the engine is dragged backwards through the main driving motor of the cold test bench, the rotating speed of the engine is equivalent to the rotating speed of the main driving shaft of the main driving motor, and the rotating speed and the change of the engine can be set through a PLC program.
And step 3: and (4) detecting the rail pressure of the engine in real time by the cold test bench through the rail pressure sensor of the engine, judging whether the rail pressure of the engine is reduced to a test trigger value of the oil sprayer, if so, executing the step 4, starting the oil sprayer test, otherwise, continuously detecting the rail pressure of the engine until the rail pressure of the engine is reduced to the test trigger value of the oil sprayer, and executing the step 4. The fuel injector test trigger value calibrated by the engine is used as a test starting point, so that the error of the test result caused by different test starting points of the fuel injector can be effectively avoided, and the accuracy of the fuel injector test result of the same type of engine and the consistency of repeated tests of the same engine are improved. Meanwhile, the fuel injector starts to inject fuel after the engine does not rotate (namely 0 RPM), namely, no fuel exists in the combustion chamber in the rotation process of the engine, so that emission pollution and compression ignition risks caused by the fuel existing in the combustion chamber when the engine rotates are effectively avoided.
Preferably, the injector test trigger value may be calibrated at the beginning of development of each type or model of engine through a Mapping test of the prior art. The Mapping test refers to: the engine Mapping test is carried out in a Mapping laboratory of a cold test equipment manufacturer at the initial stage of the cold test project for defining the cold test flow and the test project of the engine because different engines have different product characteristics.
Preferably, the injector test trigger value can be set to 1200-1800Bar during the cold test of the diesel engine, and the injector test trigger value can be set to 120-180Bar during the cold test of the gasoline engine.
Please refer to fig. 3, step 4: the cold test bench supplies power to the fuel injector, so that the fuel injector is opened and fuel in the fuel common rail is injected into a combustion chamber of the engine, and the rail pressure of the engine is further reduced. Since the injector test is performed at the end of the engine cold test, i.e., the engine is no longer rotating (at 0RPM all the time), there is no further compression stroke, and the risk of compression ignition of the fuel injected into the engine as it burns is avoided.
Preferably, the cold test bench sequentially supplies power to a plurality of fuel injectors of the engine, so that the plurality of fuel injectors are sequentially opened, and the rail pressure of the engine is reduced in a step shape.
The time interval of the cold test bench for supplying power to any two adjacent oil injectors is equal, namely the cold test bench supplies power to a plurality of oil injectors at equal time intervals, and preferably the time interval is 80-200 ms.
And 5: and the cold test rack finishes power supply for all the oil injectors, namely after the last oil injector is electrified for a period of time, the oil injectors stop injecting oil to finish testing the oil injectors, and a rail pressure test curve is displayed through a display screen of the cold test rack.
The period of time for powering on the last oil injector is equivalent to the time interval for powering on the cold test bench, and is preferably 80-200 ms.
Preferably, referring to fig. 4, steps 1 to 5 can be repeated, the same engine is subjected to a plurality of fuel injector tests, and a rail pressure test superposition curve is displayed through a display screen of a cold test bench.
The rail pressure test curve is a stepped curve, and the number of steps is equal to that of the oil injectors.
Example 1, the test object was a 4-cylinder diesel engine, and the specific test procedure was as follows:
step 1: successfully butting the engine and the cold test bench, dragging the engine to rotate by the bench to start conventional cold test, wherein the change condition of the engine speed is as follows: 0RPM → 60RPM → 500RPM → 1500RPM → 300RPM → 100RPM → 0RPM, as shown by curve A in FIG. 2.
Step 2: at the end of the cold-test of the engine, the engine speed drops to 0RPM and the engine rail pressure begins to naturally bleed, as shown by the stages a-B on curve B in fig. 2.
And step 3: the cold test bench detects the rail pressure of the engine in real time through the rail pressure sensor of the engine, in the embodiment, the test trigger value of the oil sprayer is calibrated to 1500Bar, and when the rail pressure of the engine is reduced to 1500Bar, the oil sprayer test is started.
And 4, step 4: the cold test bench sequentially supplies power to the oil injectors according to the sequence of 1 cylinder-2 cylinder-3 cylinder-4 cylinder, the power supply period is 100ms, the oil injectors of the four cylinders are sequentially opened, fuel oil in the fuel oil common rail is injected into a combustion chamber of the engine, and the rail pressure of the engine is reduced in a step shape, as shown in the stages B-c on the curve B in the attached drawing 2.
And 5: and after the cold test rack supplies power to all the oil injectors, the test of the oil injectors is finished, and a rail pressure test curve is displayed through a display screen of the cold test rack and shows 4 stepped reductions, as shown in the attached figure 3.
The steps are adopted to carry out 24 times of independent fuel injector tests on the 4-cylinder diesel engine, and rail pressure test curves of the 24 times of fuel injector tests are superposed, as shown in the attached figure 4. As can be seen from the attached figure 4, the pressure range control of 4 cylinders in the test results of the oil atomizer is within 30Bar, and the test results of 24 times of oil atomizer, namely rail pressure test curves, show good consistency.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A zero-rotation-speed oil sprayer testing method for engine cold test is characterized by comprising the following steps: the method comprises the following steps:
step 1: butting the engine with a cold test bench, dragging the engine to rotate by the bench, and starting a cold test;
step 2: at the final stage of the cold test of the engine, the rotating speed of the engine is reduced to 0RPM, and the rail pressure of the engine begins to naturally release pressure;
and step 3: the cold test bench detects the rail pressure of the engine in real time through an engine rail pressure sensor, judges whether the rail pressure of the engine is reduced to a fuel injector test trigger value or not, if so, executes the step 4, starts the fuel injector test, otherwise, continues to detect the rail pressure of the engine until the rail pressure of the engine is reduced to the fuel injector test trigger value, and executes the step 4;
and 4, step 4: the cold test rack supplies power to the oil injector, so that the oil injector is opened and fuel oil in the fuel oil common rail is injected into a combustion chamber of the engine, and the rail pressure of the engine is further reduced;
and 5: and after the cold test rack supplies power to all the oil injectors, the test on the oil injectors is finished, and a rail pressure test curve is displayed through a display screen of the cold test rack.
2. The method of testing a zero speed fuel injector for engine cold testing according to claim 1, wherein: the fuel injector test trigger value is a trigger value calibrated in the development stage of the tested engine.
3. The method of testing a zero speed fuel injector for engine cold testing according to claim 2, wherein: during the cold test of the diesel engine, the test trigger value of the oil injector is set to be 1200-1800Bar, and during the cold test of the gasoline engine, the test trigger value of the oil injector is set to be 120-180 Bar.
4. The method of testing a zero speed fuel injector for engine cold testing according to claim 1, wherein: the cold test bench sequentially supplies power to a plurality of fuel injectors of the engine, so that the plurality of fuel injectors are sequentially opened, and the rail pressure of the engine is reduced in a step shape.
5. The method of testing a zero speed fuel injector for engine cold testing according to claim 4, wherein: the cold test bench supplies power to any two adjacent oil injectors at equal time intervals, namely the cold test bench supplies power to a plurality of oil injectors at equal time intervals in sequence, and the time interval is 80-200 ms.
6. The method of testing a zero speed fuel injector for engine cold testing according to claim 1, wherein: the period of time for powering on the last oil sprayer is equivalent to the time interval for powering on the cold test bench and is 80-200 ms.
7. The method of testing a zero speed fuel injector for engine cold testing according to claim 1, wherein: repeating the steps 1 to 5, carrying out a plurality of times of fuel injector tests on the same engine, and displaying a rail pressure test superposition curve through a display screen of a cold test bench; in the rail pressure test superposition curve, the pressure range difference between adjacent rail pressure test curves does not exceed 30 Bar.
8. The zero speed injector test method of engine cold testing according to claim 1 or 7, characterized by: the rail pressure test curve is a stepped curve, and the number of steps is equal to that of the oil injectors.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114636563A (en) * | 2022-03-24 | 2022-06-17 | 柳州赛克科技发展有限公司 | Turbine engine drag-down test method and system |
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