CN111536026A - Oil pump rack testing mechanism and testing method thereof - Google Patents
Oil pump rack testing mechanism and testing method thereof Download PDFInfo
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- CN111536026A CN111536026A CN202010570582.2A CN202010570582A CN111536026A CN 111536026 A CN111536026 A CN 111536026A CN 202010570582 A CN202010570582 A CN 202010570582A CN 111536026 A CN111536026 A CN 111536026A
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- flow resistance
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M1/00—Pressure lubrication
- F01M1/02—Pressure lubrication using lubricating pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses an engine oil pump rack testing mechanism which comprises an oil tank, a workbench and a driver, wherein the workbench is used for accommodating an engine oil pump to be detected, the driver is used for controlling the engine oil pump to be detected to work, an oil outlet of the oil tank is communicated with an oil suction port of the engine oil pump to be detected, the oil outlet of the engine oil pump to be detected is communicated with an oil return port of the oil tank through an oil discharge pipe, the oil discharge pipe is connected with a first flow resistance regulating valve, the first flow resistance regulating valve is connected with a first fixed flow resistance and a first switch valve which are connected in series, and a first pressure sensor and a flow sensor are connected onto the oil discharge pipe between the oil outlet of. When the structure is adopted for testing, the structural difference between the flow resistance of the test bench and the actual flow resistance of the engine can be solved, and the capability of identifying the test bench and correctly evaluating the performance of the oil pump can be improved to a great extent.
Description
Technical Field
The invention relates to the technical field of pump performance detection, in particular to a mechanism and a method for testing a rack of an engine oil pump.
Background
The engine is used as the heart of an automobile, the oil pump of the engine is important in an engine lubricating system, and the oil pump is used for reliably lubricating key parts such as an automobile engine, a gearbox and the like. The oil pump generally comprises a shell, an inner rotor, an outer rotor, a pump cover and the like. In order to obtain better performance of the engine, the engine oil pump is generally subjected to a bench test for performance detection before delivery, so as to ensure the qualification of products delivered from factories. The bench test refers to that before the product leaves a factory, certain simulation bench tests including engine tests are generally carried out, and the product can be put into use after passing the engine tests. Generally, when an oil pump performance test is performed, a curve of a relation between outlet pressure and flow rate of the oil pump at different specified oil temperatures and different rotation speeds is tested, and then the curve is compared with the curve of the relation between outlet pressure and flow rate of the oil pump at different specified oil temperatures, so that whether the performance of the oil pump meets the specified qualified requirements is obtained. Therefore, the test bench of the oil pump is an important mechanism for judging whether the performance of the oil pump meets the requirements of the engine.
For example, the patent application with the publication number of CN107782484A disclosed on the website of the national intellectual property office discloses a flow resistance experiment device, which comprises an oil inlet pipe and an oil outlet pipe, wherein the oil outlet pipe is connected with a test bed oil tank through a pressure regulating switch, and the oil inlet pipe is connected with the test bed oil tank through a flowmeter, an inlet switch and an oil supply pump which are sequentially connected; and a pressure buffer device is also arranged on the oil inlet pipe between the flowmeter and the inlet switch. The method for connecting the pressure buffer device into the test pipeline can weaken pressure pulsation in the pipeline in the test process to a certain extent so as to improve the measurement precision of the test pressure and the flow resistance of the product. However, it is obvious that this method can only weaken the pressure pulsation to a certain extent, and when the performance of the oil pump has higher test precision, the method cannot meet the requirement.
In order to simulate the real flow resistance of an engine as much as possible in the prior art, two flow resistance valves capable of being automatically adjusted are usually arranged on a rack, and the flow of an oil pump is changed through the opening degree, so that the flow resistance of the engine is simulated. However, in many cases, especially when the variable displacement oil pump is applied to some extreme conditions (such as low-temperature conditions), due to the difference between the test bench and the actual flow resistance structure of the engine, the performance of the oil pump on the oil pump bench still has great difference from the actual performance of the oil pump after being mounted on the engine, so that the oil pump bench cannot correctly evaluate the performance of the oil pump.
Disclosure of Invention
Aiming at the problems in the prior art, the test bench mechanism is used for simulating the actual working flow resistance of the engine as much as possible, solving the structural difference between the flow resistance of the test bench and the actual flow resistance of the engine, and greatly improving the capability of identifying the test bench and correctly evaluating the performance of the oil pump.
In order to solve the technical problem, the invention provides an oil pump rack testing mechanism which comprises an oil tank, a workbench and a driver, wherein the workbench is used for accommodating an oil pump to be detected, the driver is used for controlling the oil pump to be detected to work, an oil outlet of the oil tank is communicated with an oil suction port of the oil pump to be detected, the oil outlet of the oil pump to be detected is communicated with an oil return port of the oil tank through an oil discharge pipe, the oil discharge pipe is connected with a first flow resistance regulating valve, the first flow resistance regulating valve is connected with a first fixed flow resistance and a first switch valve which are connected in series, and a first pressure sensor and a flow sensor are connected on the oil discharge pipe between the oil outlet of the oil pump.
And a second flow resistance regulating valve is connected in series on the oil discharge pipe between the first flow resistance regulating valve and the oil return port of the oil tank.
And the second flow resistance regulating valve is connected with a second fixed flow resistance and a second switch valve which are mutually connected in series in parallel.
And a second pressure sensor is connected in series on the oil discharge pipe between the first flow resistance regulating valve and the second flow resistance regulating valve.
An oil return pipe is connected to the oil discharge pipe between the first flow resistance regulating valve and the second flow resistance regulating valve, and the oil return pipe is connected with the oil pump to be detected.
And the driver is provided with a structure for adjusting the rotating speed and the torque of the oil pump to be detected.
After adopting the structure, compared with the prior art, the invention has the following advantages:
1) the test bench is additionally provided with a fixed flow resistance and a switch valve which simulate the actual flow resistance of an engine in parallel on the basis of only a first flow resistance regulating valve and a second flow resistance regulating valve, so that the engine oil of the whole engine oil pump test bench can flow away from a fixed flow resistance branch, the actual flow resistance of the engine is greatly reduced, the test precision is greatly improved, the fixed flow resistance of different engines can be replaced, and the proper fixed flow resistance can be selected for testing;
2) when the requirement on the test precision of the oil pump is general, the valve connected with the fixed flow resistance can be closed, so that the oil of the whole oil pump test bench can flow away from the flow resistance branch of the regulating valve, the flow resistance can be quickly regulated, the approximate flow resistance of the engine can be simulated, and the quick and convenient test can be realized.
The invention aims to solve another technical problem of providing a testing method of the oil pump rack testing mechanism, which controls the testing precision so as to greatly improve the working efficiency.
In order to solve the technical problem, the testing method of the oil pump rack testing mechanism provided by the invention comprises the following steps:
when the flow resistance of the engine needs to be restored with high precision:
1) according to the requirement of the pipe diameter of a flow passage of an oil pump to be detected, a first fixed flow resistance and a second fixed flow resistance with the same pipe diameter are selected and installed on a test bench;
2) starting a driver, closing the first flow resistance regulating valve and the second flow resistance regulating valve, and opening the first switch valve and the second switch valve, so that the engine oil of the whole engine oil pump test bench can flow away from the first fixed flow resistance branch and the second fixed flow resistance branch;
3) collecting information of a first pressure sensor, a second pressure sensor and a flow sensor, checking the information with a target pressure value and a target flow value of the engine, and carrying out logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the flow value of the test bench is consistent with the target flow value by adjusting the pipe diameter of the second fixed flow resistance, and then the pipe diameter of the first fixed flow resistance is adjusted to enable the pressure value of the oil outlet of the oil pump to be detected and the pressure value of the oil return pipe to be consistent with the target pressure value;
when the flow resistance of the engine is not required to be restored with high precision:
1) starting a driver, closing the first switch valve and the second switch valve, opening the first flow resistance regulating valve and the second flow resistance regulating valve, and enabling the engine oil of the whole engine oil pump test bench to branch from the first flow resistance regulating valve and the second flow resistance regulating valve;
2) collecting information of a first pressure sensor, a second pressure sensor and a flow sensor, checking the information with a target pressure value and a target flow value of the engine, and carrying out logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the flow value and the pressure value of the test bench are made to be consistent with the target pressure value and the target flow value by directly adjusting the opening degree of the first flow resistance adjusting valve and the second flow resistance adjusting valve.
After the test method is adopted, compared with the prior art, the method has the advantages that: aiming at different testing precision requirements, different modes of the testing bench can be selected, when the flow resistance of the engine needs to be restored with high precision, the first flow resistance regulating valve and the second flow resistance regulating valve are closed, the first switch valve and the second switch valve are opened, the engine oil of the whole engine oil pump testing bench can bypass the first fixed flow resistance and the second fixed flow resistance, when the flow resistance of the engine does not need to be restored with high precision, the first switch valve and the second switch valve are closed, the first flow resistance regulating valve and the second flow resistance regulating valve are opened, the engine oil of the whole engine oil pump testing bench can bypass the first flow resistance regulating valve and the second flow resistance regulating valve, then the information collected by the sensor is logically judged, the actual pressure value and the actual flow value are compared with the target pressure value and the target flow value, no matter the actual pressure value and the actual flow value are higher than the target pressure value and the target flow, the test bench can adjust the pressure and flow output of the engine oil pump to be detected according to the structure, and finally enables the target pressure value and the target flow value to be consistent with the actual pressure value and the actual flow value after continuous iteration, so that the test precision is higher, and the capability of identifying and correctly evaluating the performance of the engine oil pump by the test bench is improved to a great extent.
Drawings
FIG. 1 is a schematic structural diagram of an oil pump rack testing mechanism in an embodiment 1 of the invention;
FIG. 2 is a schematic structural diagram of an oil pump rack testing mechanism in embodiment 2 of the present invention;
FIG. 3 is a schematic structural diagram of an oil pump rack testing mechanism in embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of an oil pump rack testing mechanism embodiment 4 of the present invention.
In the attached drawings, 1, an oil pump to be detected; 2. an oil tank; 3. a driver; 4. an oil discharge pipe; 5. a first flow resistance regulating valve; 6. a second flow resistance regulating valve; 7.1, a first fixed flow resistance; 7.2, a second fixed flow resistance; 8.1, a first switch valve; 8.2, a second switch valve; 9. a flow sensor; 10. a first pressure sensor; 11. a second pressure sensor; 12. an oil return pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1, the oil pump rack testing mechanism includes an oil tank 2, a workbench for accommodating the oil pump 1 to be detected, and a driver 3 for controlling the operation of the oil pump 1 to be detected, a structure for adjusting the rotation speed and the torque of the oil pump 1 to be detected is provided on the driver 3, an oil outlet of the oil tank 2 is communicated with an oil suction port of the oil pump 1 to be detected, the oil outlet of the oil pump 1 to be detected is communicated with an oil return port of the oil tank 2 through an oil discharge pipe 4, and the oil discharge pipe 4 is sequentially connected with a first pressure sensor 10, a flow sensor 9.
In the embodiment, the first pressure sensor 10, the flow sensor 9 and the first flow resistance regulating valve 5 are sequentially connected to the oil discharge pipe 4 between the oil pump 1 to be detected and the oil tank 2 to simulate the flow resistance of the engine, the pressure value and the flow value on the pipeline are tested, and the pressure value and the flow value are compared with the target pressure value and the target flow value to test the performance of the engine, so that the outgoing product of the engine is qualified.
The specific test steps are as follows:
1) the driver 3 is started, the first flow resistance regulating valve 5 is opened, and the engine oil of the whole engine oil pump test bench can flow away from the pipeline of the oil discharge pipe 4;
2) collecting information of a first pressure sensor 10 and a flow sensor 9, checking the information with a target pressure value and a target flow value of an engine, and carrying out logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the opening degree of the first flow resistance regulating valve 5 is directly regulated, so that the pressure value and the flow value of the test bench are consistent with the target pressure value and the target flow value.
Example 2:
as shown in fig. 2, when the variable displacement oil pump is applied to some limit conditions (such as low-temperature conditions), the difference between the test bench and the actual flow resistance structure of the engine, and the performance of the oil pump on the oil pump bench and the actual performance of the oil pump after being mounted on the engine still have great difference, so that the oil pump bench cannot correctly evaluate the performance of the oil pump, therefore, in order to simulate the actual flow resistance of the engine as much as possible, on the basis of embodiment 1, the first fixed flow resistance 7.1 and the first switch valve 8.1 are connected in parallel to the first flow resistance adjusting valve 5, where the first fixed flow resistance 7.1 is the actual flow resistance of the oil pump under some limit conditions, which makes the test bench evaluate the test performance of the engine more accurately.
The specific test steps are as follows:
1) according to the requirement of the pipe diameter of a flow passage of an oil pump 1 to be detected, a first fixed flow resistance 7.1 with the same pipe diameter is selected and installed on a test bench;
2) starting the driver 3, closing the first flow resistance regulating valve 5, opening the first switch valve 8.1, and enabling the engine oil of the whole engine oil pump test bench to branch from the first fixed flow resistance 7.1;
3) collecting information of a first pressure sensor 10 and a flow sensor 9, checking the information with a target pressure value and a target flow value of an engine, and carrying out logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the pressure value and the flow value of the test bench are consistent with the target pressure value and the target flow value by adjusting the pipe diameter of the first fixed flow resistance 7.1.
Example 3:
as shown in fig. 3, the basic structure is the same as that of embodiment 2, except that: the second pressure sensor 11 and the second flow resistance adjusting valve 6 are sequentially connected in series on the oil discharge pipe 4 behind the first flow resistance adjusting valve 5, an oil return pipe 12 is connected on the oil discharge pipe 4 between the first flow resistance adjusting valve 5 and the second flow resistance adjusting valve 6, and the oil return pipe 12 is connected with the oil pump 1 to be detected. In the embodiment, a second flow resistance regulating valve 6 is additionally arranged, and correspondingly, a second pressure sensor 11 is additionally arranged in front of the second flow resistance regulating valve 6 in order to measure a more accurate pressure value. In order to simulate the actual engine working state, an oil return pipe 12 is connected to the oil discharge pipe 4 between the first flow resistance regulating valve 5 and the second flow resistance regulating valve 6, and the oil return pipe 12 is connected with the oil pump 1 to be detected.
The specific test steps are as follows:
1) according to the requirement of the pipe diameter of a flow passage of an oil pump 1 to be detected, a first fixed flow resistance 7.1 with the same pipe diameter is selected and installed on a test bench;
2) starting the driver 3, closing the first flow resistance regulating valve 5, opening the first switch valve 8.1, and enabling the engine oil of the whole engine oil pump test bench to branch from the first fixed flow resistance 7.1 and the second flow resistance regulating valve 6;
3) collecting information of a first pressure sensor 10, a second pressure sensor 11 and a flow sensor 9, checking the information with a target pressure value and a target flow value of an engine, and performing logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the pressure value and the flow value of the test bench are made to be consistent with the target pressure value and the target flow value by directly adjusting the pipe diameter of the first fixed flow resistance 7.1 and the opening degree of the second flow resistance adjusting valve 6.
Example 4:
as shown in fig. 4, the basic structure is the same as that of embodiment 3, except that: the invention of the embodiment 2 is used, the second fixed flow resistance 7.2 and the second switch valve 8.2 are connected in parallel to the second flow resistance regulating valve 6, and the real flow resistance of the engine can be further simulated, so that the testing precision is higher, and the capability of identifying the testing bench and correctly evaluating the performance of the oil pump is improved to a great extent.
The specific test steps are as follows:
1) according to the requirement of the flow channel pipe diameter of the oil pump 1 to be detected, a first fixed flow resistance 7.1 and a second fixed flow resistance 7.2 with the same pipe diameter are selected and installed on a test bench;
2) starting the driver 3, closing the first flow resistance regulating valve 5 and the second flow resistance regulating valve 6, and opening the first switch valve 8.1 and the second switch valve 8.2, so that the engine oil of the whole engine oil pump test bench can branch from the first fixed flow resistance 7.1 and the second fixed flow resistance 7.2;
3) collecting information of a first pressure sensor 10, a second pressure sensor 11 and a flow sensor 9, checking the information with a target pressure value and a target flow value of an engine, and performing logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the flow value of the test bench is consistent with the target flow value by adjusting the pipe diameter of the second fixed flow resistance 7.2, and then the pipe diameter of the first fixed flow resistance 7.1 is adjusted, so that the pressure value of the oil outlet of the oil pump 1 to be detected and the pressure value of the oil return pipe 12 are consistent with the target pressure value.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides an engine oil pump rack accredited testing organization, includes oil tank (2), is used for holding the workstation that detects engine oil pump (1) and is used for controlling driver (3) that detect engine oil pump (1) work, the oil-out of oil tank (2) and the oil absorption mouth intercommunication of detecting engine oil pump (1), the oil-out of detecting engine oil pump (1) is through oil drain pipe (4) and the oil return mouth intercommunication of oil tank (2), its characterized in that: the oil pump is characterized in that a first flow resistance adjusting valve (5) is connected onto the oil discharge pipe (4), a first fixed flow resistance (7.1) and a first switch valve (8.1) which are connected in series are connected onto the first flow resistance adjusting valve (5) in parallel, and a first pressure sensor (10) and a flow sensor (9) are connected onto the oil discharge pipe (4) between the oil outlet of the oil pump (1) to be detected and the first flow resistance adjusting valve (5).
2. The oil pump stand testing mechanism of claim 1, characterized in that a second flow resistance regulating valve (6) is connected in series on the oil discharge pipe (4) between the first flow resistance regulating valve (5) and the oil return port of the oil tank (2).
3. The oil pump stand testing mechanism according to claim 2, characterized in that the second flow resistance regulating valve (6) is connected in parallel with a second fixed flow resistance (7.2) and a second on-off valve (8.2) connected in series.
4. The oil pump stand testing mechanism according to claim 3, characterized in that a second pressure sensor (11) is connected in series on the oil drain pipe (4) between the first flow resistance regulating valve (5) and the second flow resistance regulating valve (6).
5. The oil pump rack testing mechanism of claim 4, characterized in that an oil return pipe (12) is connected to the oil discharge pipe (4) between the first flow resistance regulating valve (5) and the second flow resistance regulating valve (6), and the oil return pipe (12) is connected to the oil pump (1) to be tested.
6. The oil pump rack testing mechanism according to claim 1, characterized in that the driver (3) is provided with a structure for adjusting the rotating speed and the torque of the oil pump (1) to be tested.
7. A testing method using the oil pump stand testing mechanism of claim 5, characterized in that: it comprises the following steps:
when the flow resistance of the engine needs to be restored with high precision:
1) according to the requirement of the pipe diameter of a flow passage of an oil pump (1) to be detected, a first fixed flow resistance (7.1) and a second fixed flow resistance (7.2) with the same pipe diameter are selected and installed on a test bench;
2) starting a driver (3), closing a first flow resistance regulating valve (5) and a second flow resistance regulating valve (6), opening a first switch valve (8.1) and a second switch valve (8.2), and enabling the engine oil of the whole engine oil pump test bench to branch from a first fixed flow resistance (7.1) and a second fixed flow resistance (7.2);
3) collecting information of a first pressure sensor (10), a second pressure sensor (11) and a flow sensor (9), checking the information with a target pressure value and a target flow value of an engine, and carrying out logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the flow value of the test rack is consistent with the target flow value by adjusting the pipe diameter of the second fixed flow resistance (7.2), and then the pipe diameter of the first fixed flow resistance (7.1) is adjusted to make the pressure value of the oil outlet of the oil pump (1) to be detected and the pressure value of the oil return pipe (12) consistent with the target pressure value;
when the flow resistance of the engine is not required to be restored with high precision:
1) starting a driver (3), closing a first switch valve (8.1) and a second switch valve (8.2), and opening a first flow resistance regulating valve (5) and a second flow resistance regulating valve (6), so that the engine oil of the whole engine oil pump test bench can branch from the first flow resistance regulating valve (5) and the second flow resistance regulating valve (6);
2) collecting information of a first pressure sensor (10), a second pressure sensor (11) and a flow sensor (9), checking the information with a target pressure value and a target flow value of an engine, and carrying out logic judgment and adjustment, so as to continuously iterate until the actually measured pressure value and flow value are consistent with the target pressure value and the target flow value:
if the actual pressure value and the actual flow value are different from the target pressure value and the target flow value, the pressure value and the flow value of the test bench are made to be consistent with the target pressure value and the target flow value by directly adjusting the opening degrees of the first flow resistance adjusting valve (5) and the second flow resistance adjusting valve (6).
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Cited By (1)
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| CN111927754A (en) * | 2020-08-27 | 2020-11-13 | 华域皮尔博格泵技术有限公司 | Test tool for oil pump |
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