An oil pump testing device and method

Abstract

The application discloses an engine oil pump testing device and method, and belongs to the technical field of engines.The device is composed of an oil tank, a first pressure sensor, a second pressure sensor, a first control valve, a second control valve and a controller.Through the device, the third end of the second pipeline is connected with the first end of the third pipeline, and the second end of the third pipeline is connected with the input end of the pressure limiting valve of the to-be-tested engine oil pump, so that the pressure limiting valve can be controlled by the oil pressure of the main oil passage, the consistency of the pressure limiting valve during testing with the actual operation condition of the engine is improved, and the reliability of the testing result of the pressure limiting valve is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the engine technical field, especially relates to a kind of oil pump test device and method. BACKGROUND

[0002] The pressure-limiting valve of oil pump is an important component in engine lubricating system, which can prevent the oil pressure in lubricating system from being too high, and limit the maximum pressure within the set limit. When the engine is working, the oil pump pressure increases with the increase of engine speed. When the oil passage in lubricating system is clogged, the shaft gap is too small, or the viscosity of the oil used is too large, the oil supply pressure will also increase. Therefore, a pressure-limiting valve is arranged in the lubricating system to limit the maximum oil pressure to ensure safety. When the oil pressure in the main oil passage exceeds the predetermined pressure, the pressure-limiting valve spring force is overcome to open the valve, and part of the oil flows into the oil pan through the side passage, so that the oil pressure in the oil passage drops to the set normal value, and then the valve is closed. In this way, the oil pump overload or damage to the oil passage seal to cause oil leakage can be avoided.

[0003] In order to ensure the normal operation of the engine, the pressure-limiting valve of the oil pump is usually tested on an oil pump test bench before the engine is assembled. For example, the opening pressure and durability of the pressure-limiting valve are tested.

[0004] In the prior art, the pressure-limiting valve is controlled by the high-pressure oil after the pump during the test on the oil pump test bench. Under the rated speed, the opening degree of the pressure-limiting valve is larger than that under the actual operating condition, which is not consistent with the actual operating condition, and the reliability of the test results is poor. SUMMARY

[0005] The embodiments of the present application provide an oil pump test device and method to improve the consistency of the pressure-limiting valve test with the actual operating condition of the engine and improve the reliability of the test results of the pressure-limiting valve.

[0006] In a first aspect, the embodiments of the present application provide an oil pump test device, which comprises an oil tank, a first pressure sensor, a second pressure sensor, a first control valve, a second control valve and a controller.

[0007] The first end of the first control valve is connected to the oil outlet of the oil pump to be tested through a first pipeline, the second end of the first control valve is connected to the first end of a second pipeline, the first end of the second control valve is connected to the second end of the second pipeline, the third end of the second pipeline is connected to the first end of a third pipeline, and the second end of the third pipeline is connected to the input end of the pressure-limiting valve of the oil pump to be tested. The second end of the second control valve extends to the oil tank through a fourth pipeline, and the output end of the pressure-limiting valve extends to the oil tank through a fifth pipeline. The first pressure sensor is arranged on the first pipeline, and the second pressure sensor is arranged on the second pipeline.

[0008] the controller is in signal connection with the first pressure sensor, the second pressure sensor, the first control valve and the second control valve;

[0009] the controller is configured to, when the oil pump is in normal operation, adjust the opening degree of the first control valve so that the first oil pressure measured by the first pressure sensor is equal to a first oil pressure threshold value; adjust the opening degree of the second control valve, and determine the second oil pressure measured by the second pressure sensor at different opening degrees; and determine the opening pressure of the pressure limiting valve based on the second oil pressure at each opening degree and the valve state of the pressure limiting valve.

[0010] In some embodiments, the device further comprises a third control valve:

[0011] the third control valve is arranged on the third pipeline and in signal connection with the controller;

[0012] after the controller adjusts the opening degree of the first control valve so that the first oil pressure measured by the first pressure sensor is equal to the first oil pressure threshold value, and before the controller adjusts the opening degree of the second control valve to determine the second oil pressure measured by the second pressure sensor at different opening degrees, the controller is further configured to:

[0013] adjust the opening degree of the second control valve so that the second oil pressure measured by the second pressure sensor is equal to a second oil pressure threshold value; adjust the opening degree of the third control valve, determine a first actual fluctuation amplitude of the second oil pressure at different opening degrees, and determine a target opening degree corresponding to a first actual fluctuation amplitude matching the preset fluctuation amplitude, and control the opening degree of the third control valve to be the target opening degree.

[0014] In some embodiments, after the controller determines the opening pressure of the pressure limiting valve, the controller is further configured to:

[0015] control the opening degree of the second control valve to be an opening degree corresponding to the second oil pressure threshold value; and control the oil pump to run continuously for a preset time length.

[0016] In some embodiments, during the process of controlling the oil pump to run continuously for a preset time length, the controller is further configured to:

[0017] determine a second actual fluctuation amplitude according to the second oil pressure measured by the second pressure sensor in each preset period; compare each second actual fluctuation amplitude with the preset fluctuation amplitude, and determine whether to update the target opening degree based on the comparison result.

[0018] In some embodiments, the controller is specifically configured to:

[0019] detecting a valve opening size of the pressure limiting valve corresponding to each second oil pressure; and determining the second oil pressure at a current opening degree as an opening pressure of the pressure limiting valve if the valve opening size of the pressure limiting valve exceeds a preset threshold value.

[0020] In a second aspect, the embodiments of the present application provide an oil pump test method applied to the controller in the oil pump test device of any one of the preceding aspects, and the method comprises:

[0021] adjusting the opening degree of the first control valve to make the first oil pressure measured by the first pressure sensor equal to a first oil pressure threshold value when the to-be-tested oil pump is normally operating;

[0022] adjusting the opening degree of the second control valve, and determining the second oil pressure measured by the second pressure sensor at different opening degrees;

[0023] determining an opening pressure of the pressure limiting valve based on the second oil pressure at each opening degree and the valve state of the pressure limiting valve of the to-be-tested oil pump.

[0024] In some embodiments, after the adjusting of the opening degree of the first control valve to make the first oil pressure measured by the first pressure sensor equal to the first oil pressure threshold value, and before the adjusting of the opening degree of the second control valve and the determining of the second oil pressure measured by the second pressure sensor at different opening degrees, the method further comprises:

[0025] adjusting the opening degree of the second control valve to make the second oil pressure measured by the second pressure sensor equal to a second oil pressure threshold value;

[0026] adjusting the opening degree of the third control valve, determining a first actual fluctuation amplitude of the second oil pressure at different opening degrees, and determining a target opening degree corresponding to a first actual fluctuation amplitude matching a preset fluctuation amplitude, and controlling the opening degree of the third control valve at the target opening degree.

[0027] In some embodiments, after the determining of the opening pressure of the pressure limiting valve, the method further comprises:

[0028] controlling the opening degree of the second control valve to be an opening degree corresponding to the second oil pressure threshold value, and controlling the oil pump to continuously operate for a preset time length.

[0029] In some embodiments, during the controlling of the oil pump to continuously operate for a preset time length, the method further comprises:

[0030] determining a second actual fluctuation amplitude according to the second oil pressure measured by the second pressure sensor at each preset period;

[0031] The second actual fluctuation amplitude is compared with the preset fluctuation amplitude, and it is determined whether to update the target opening degree based on a comparison result.

[0032] In some embodiments, the opening pressure of the pressure limiting valve is determined based on the second oil pressure and the valve state of the pressure limiting valve at each opening degree, including:

[0033] The valve opening size of the pressure limiting valve corresponding to each second oil pressure is detected.

[0034] If the valve opening size of the pressure limiting valve exceeds a preset threshold, the second oil pressure at the current opening degree is determined as the opening pressure of the pressure limiting valve.

[0035] In a third aspect, an embodiment of the present application provides a controller, including at least one processor, and a memory in communication connection with the at least one processor, wherein:

[0036] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the above-mentioned oil pump test method.

[0037] In a fourth aspect, an embodiment of the present application provides a storage medium, when a computer program in the storage medium is executed by a processor of a controller, the controller can execute the above-mentioned oil pump test method.

[0038] An oil pump test device and method provided by an embodiment of the present application, the device is composed of an oil tank, a first pressure sensor, a second pressure sensor, a first control valve, a second control valve and a controller. Through the above-mentioned device, since the third end of the second pipeline is connected with the first end of the third pipeline, and the second end of the third pipeline is connected with the input end of the pressure limiting valve of the oil pump to be tested, the pressure limiting valve can be controlled by the oil pressure of the main oil passage, the conformity of the pressure limiting valve to the actual operating condition of the engine during the test is improved, and the reliability of the test result of the pressure limiting valve is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application, the schematic embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0040] Figure 1 A structural schematic diagram of an oil pump test device in the prior art is provided for an embodiment of the present application;

[0041] Figure 2 A structural schematic diagram of an oil pump test device is provided for an embodiment of the present application;

[0042] Figure 3 Another schematic structural view of an oil pump test device provided by an embodiment of the present application is shown in FIG. 2.

[0043] Figure 4 Another schematic structural view of an oil pump test device provided by an embodiment of the present application is shown in FIG. 2.

[0044] Figure 5 A flow chart of an oil pump test method provided by an embodiment of the present application is shown in FIG. 4.

[0045] Figure 6 A schematic hardware structure of a controller for implementing an oil pump test method provided by an embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0046] In order to improve the consistency of the pressure limiting valve test with the actual operating conditions of the engine and improve the reliability of the test results of the pressure limiting valve, an oil pump test device and method are provided by an embodiment of the present application.

[0047] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings of the specification, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application, and the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0048] It should be noted that in the description of the present application, "a plurality of" is understood as "at least two". The association relationship between the associated objects is described, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists alone, A and B exist together, and B exists alone. A and B are connected, which means that A and B are directly connected and A and B are connected through C. In addition, in the description of the present application, "first", "second", etc. are used only for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0049] In order to facilitate the understanding of the present application, the technical terms involved in the present application are as follows:

[0050] Frictional resistance loss: When fluid moves, friction will be generated between the fluid and the wall and between the fluid particles due to the influence of its own viscosity and the roughness of the pipe wall. This frictional resistance along the flow path hinders the movement of the fluid. The energy loss generated by the moving fluid to overcome the frictional resistance is called the frictional loss.

[0051] Oil pump: the important component in the engine lubrication system, its working principle is when the engine works, the crankshaft drives the oil pump rotor through the D-shaped journal, so that the rotor of the oil pump rotates with the crankshaft, the inner rotor and the outer rotor of the oil pump exist eccentricity, the rotor tooth shape is cycloid tooth profile. In this way, the inner and outer rotors form a plurality of working cavities, with the rotation of the rotor, the volume of the working cavity is constantly changing. In the cavity on the one side of the oil inlet, the volume gradually increases due to the disengagement of the rotor, a vacuum is generated, the oil is sucked in, the rotor continues to rotate, the oil is taken to the side of the oil outlet, at this time, the rotor is just engaged, so that the volume of the cavity decreases, the oil pressure rises, the oil is squeezed out from the tooth gap and is pressed out through the oil outlet.

[0052] The embodiments of the present application are described in detail below with reference to the drawings.

[0053] The pressure limiting valve of the oil pump is an important component in the engine lubrication system, the pressure limiting valve can prevent the oil pressure in the lubrication system from being too high, limit the highest pressure within the set limit, when the engine works, the oil pump pressure increases with the increase of the engine speed, and when the oil way in the lubrication system is clogged, the shaft gap is too small or the viscosity of the used oil is too large, the oil supply pressure will also increase, therefore, the pressure limiting valve is arranged in the lubrication system to limit the highest oil pressure to ensure safety. When the oil pressure on the main oil way exceeds the predetermined pressure, the pressure limiting valve spring force is overcome, the valve is opened, a part of the oil flows into the oil pan through the side channel, the oil pressure in the oil way is reduced to the set normal value, and then the valve is closed. In this way, the overloading of the oil pump or the leakage caused by the damage of the oil way seal can be avoided.

[0054] In order to make the engine work normally, the oil pump test bench is often used before the engine assembly to test the pressure limiting valve of the oil pump, such as testing the opening pressure and durability of the pressure limiting valve.

[0055] Figure 1 The structure diagram of the oil pump test device in the prior art provided by the embodiments of the present application is shown in Figure 1 As shown in the figure, the oil pump test device includes an oil pump 11, a control valve 12, a pressure limiting valve 13 and an oil tank 14, which are Figure 1It is known that the input end of the pressure relief valve 13 is directly connected to the oil outlet pipe of the oil pump 11 via a pipeline. In other words, the pressure relief valve 13 is controlled by the high-pressure oil after the oil pump 11. During actual engine operation, the function of the pressure relief valve 13 is to overcome the spring force of the pressure relief valve 13 and open the valve when the oil pressure in the main oil passage exceeds the predetermined pressure, allowing some oil to flow into the oil pan from the side passage, thus reducing the oil pressure in the oil passage. After the pressure drops to the set normal value, the valve closes, limiting the further increase of oil pressure and preventing oil pump overload or damage to the oil circuit seal, which could cause oil leakage. In other words, the pressure of the pressure relief valve 13 should be controlled by the pressure of the main oil passage. Therefore, at the calibrated speed, when tested with the existing oil pump test device, the opening of the pressure relief valve 13 is larger than the actual operating conditions, which does not match the actual operating conditions and results in poor reliability of the test results.

[0056] Based on this, this application provides an oil pump testing device and method, which changes the oil circuit structure of the pressure relief valve and connects the input end of the pressure relief valve to the pipeline of the main oil passage, so that the pressure relief valve is controlled by the oil pressure of the main oil passage. In this way, the consistency between the pressure relief valve test and the actual operating conditions of the engine can be improved, thereby improving the reliability of the pressure relief valve test results.

[0057] Firstly, such as Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of an oil pump testing device provided in an embodiment of this application. The device includes an oil tank 21, a first pressure sensor 22, a second pressure sensor 23, a first control valve 24, a second control valve 25, and a controller 26.

[0058] The first end of the first control valve 24 is connected to the oil outlet of the oil pump under test via a first pipe. Adjusting the opening of the first control valve 24 controls the post-pump pressure of the oil pump, as this affects the fluid velocity and resistance through the pipe, thus influencing the pressure within the pipe. The second end of the first control valve 24 is connected to the first end of a second pipe, which simulates the main oil passage during normal engine operation. The first end of the second control valve 25 is connected to the second end of the second pipe. Adjusting the opening of the second control valve 25 controls the pressure within the second pipe. This means that it can be used to regulate the pressure of the main oil passage. The third end of the second pipe is connected to the first end of the third pipe, and the second end of the third pipe is connected to the input end of the pressure relief valve of the oil pump under test. The second end of the second control valve 25 extends into the oil tank 21 through the fourth pipe, and the output end of the pressure relief valve extends into the oil tank 21 through the fifth pipe. The first pressure sensor 22 is set on the first pipe to measure the oil pressure in the first pipe, that is, to measure the pump pressure after the oil pump under test. The second pressure sensor 23 is set on the second pipe to measure the oil pressure in the second pipe, that is, to measure the oil pressure of the main oil passage.

[0059] The controller 26 is in signal connection with the first pressure sensor 22, the second pressure sensor 23, the first control valve 24 and the second control valve 25, so that the controller 26 can receive the oil pressure measured by the first pressure sensor 22 and the second pressure sensor 23, and control the opening degree of the first control valve 24 and the second control valve 25.

[0060] In a specific experiment, the controller 26 can adjust the opening degree of the first control valve 24 when the oil pump is working normally, so that the first oil pressure measured by the first pressure sensor 22 is equal to the first oil pressure threshold value, and adjust the opening degree of the second control valve 25. Under different opening degrees, the second oil pressure measured by the second pressure sensor 23 is determined, and then based on the second oil pressure under each opening degree and the valve state of the pressure limiting valve, the opening pressure of the pressure limiting valve is determined. In a specific implementation, the valve opening size of the pressure limiting valve corresponding to each second oil pressure can be detected, and if the valve opening size of the pressure limiting valve exceeds a preset threshold value, the second oil pressure under the current opening degree is determined as the opening pressure of the pressure limiting valve. It should be noted that, since different engine models have different resistance losses and main oil passage pressures, and the post-pump pressure of the oil pump is actually the sum of the resistance loss and the main oil passage pressure, according to the resistance loss and the main oil passage pressure corresponding to each engine model provided by the engine equipment manufacturer, the oil pump test device provided by the present application can be adapted to different engine models, and the corresponding first oil pressure threshold value, i.e. the post-pump pressure threshold value, can be set.

[0061] Based on the above device, the pressure limiting valve is connected to the second pipeline through the third pipeline, so that the pressure of the pressure limiting valve is controlled by the pressure of the second pipeline, i.e. the pressure limiting valve is controlled by the oil pressure of the main oil passage under the actual operating condition of the engine. In this way, the consistency of the pressure limiting valve during testing with the actual operating condition of the engine can be improved, and the reliability of the test results of the pressure limiting valve can be improved.

[0062] In actual application, the pressure of the main oil passage is near the opening pressure of the pressure limiting valve. If the pressure limiting valve is relatively sensitive, the pressure of the main oil passage will fluctuate. Assuming that the opening pressure of the pressure limiting valve is 6 bar and the pressure of the main oil passage is also 6 bar, the pressure limiting valve may be opened frequently at this time. Therefore, a throttle valve can be added to the third pipeline to avoid frequent opening of the pressure limiting valve.

[0063] In some embodiments, Figure 3 Another structure schematic diagram of the oil pump test device provided by the embodiments of the present application is shown in FIG. 3. As shown in FIG. 3, the oil pump test device further comprises a third control valve 27, wherein the third control valve 27 is arranged on the third pipeline and is in signal connection with the controller 26. The third control valve 27 is used to adjust the diameter of the third pipeline from the main oil passage to the pressure limiting valve. Figure 3 The third control valve 27 is used to adjust the diameter of the third pipeline from the main oil passage to the pressure limiting valve.

[0064] Therefore, the controller 26 adjusts the opening degree of the second control valve 25 after the opening degree of the first control valve 24 is adjusted so that the first oil pressure measured by the first pressure sensor 22 is equal to the first oil pressure threshold value, and before the second oil pressure measured by the second pressure sensor 23 is determined at different opening degrees, the opening degree of the second control valve 25 is adjusted so that the second oil pressure measured by the second pressure sensor 23 is equal to the second oil pressure threshold value. In practice, the second oil pressure threshold value corresponding to the main oil passage pressure can be set according to the main oil passage pressure of each engine model provided by the engine equipment manufacturer. The opening degree of the third control valve 27 is adjusted to determine the first actual fluctuation amplitude of the second oil pressure at different opening degrees, wherein each first actual fluctuation amplitude can be determined according to the second oil pressure at different opening degrees, and then each first actual fluctuation amplitude is compared with the preset fluctuation amplitude to determine the target opening degree corresponding to the first actual fluctuation amplitude matching the preset fluctuation amplitude, and the opening degree of the third control valve 27 is controlled at the target opening degree. For example, the preset fluctuation amplitude is ±10, the opening degree of the third control valve 27 is adjusted, when the diameter is between 5 and 10, the first actual fluctuation amplitude is within the preset fluctuation amplitude range, the opening degree of the third control valve 27 is 5~10, and if the opening degree is 7, the pressure fluctuation of the main oil passage is the most stable, the target opening degree is 7, and the opening degree of the third control valve 27 is controlled at the target opening degree. 5to 10 5~ 10 7 7

[0065] In actual application, after the opening degree of the third control valve 27 is controlled at the target opening degree, it can be further judged whether the target opening degree is suitable in the long-term running process, therefore, after the opening pressure of the pressure limiting valve is determined, the opening degree of the second control valve 25 can be controlled to the opening degree corresponding to the second oil pressure threshold value, and the oil pump can be controlled to run continuously for a preset time length.

[0066] During the process of controlling the oil pump to run continuously for a preset time length, the controller 26 is further configured to determine a second actual fluctuation amplitude according to the second oil pressure measured by the second pressure sensor 23 every preset period, compare each second actual fluctuation amplitude with the preset fluctuation amplitude, and judge whether to update the target opening degree based on the comparison result. For example, the preset time length is 200 hours, and the preset period is 10 hours, i.e., the second actual fluctuation amplitude is determined once every 10 hours, each second actual fluctuation amplitude is compared with the preset fluctuation amplitude, if a preset number or a preset proportion of the second actual fluctuation amplitudes meet the preset fluctuation amplitude, it is determined that the target opening degree is suitable, otherwise, the test needs to be re-performed, and the target opening degree is updated.

[0067] For the test of the pressure-limiting valve, in addition to testing the opening pressure of the pressure-limiting valve, a durability test of the pressure-limiting valve is also needed, that is, to determine whether the pressure-limiting valve will fail due to wear. Therefore, during the process in which the controller 26 controls the oil pump to continuously operate for a preset time length, the pressure-limiting valve can also be disassembled every certain time, such as every 20 hours, to check the wear of the pressure-limiting valve.

[0068] In actual applications, in addition to testing the pressure-limiting valve, the safety valve also needs to be tested. The safety valve functions to open when the oil filter element is blocked and the oil pressure rises, so that the oil directly enters the main oil passage without passing through the filter, thereby ensuring sufficient lubricating oil and avoiding damage to the engine due to lack of oil. Therefore, based on the above device, the input end of the safety valve can also be connected to the first end of the sixth pipeline, the second end of the sixth pipeline is connected to the third end of the first pipeline, and the output end of the safety valve is extended to the oil tank 21 through the seventh pipeline, as shown in Figure 4 Figure 4 Another structure diagram of an oil pump test device provided by an embodiment of the present application.

[0069] As shown in Figure 4 Since the safety valve is controlled by the pressure after the pump, when testing the safety valve, the second control valve 25 can be opened, the third control valve 27 can be closed, and the opening degree of the first control valve 24 can be adjusted. The first oil pressure measured by the first pressure sensor 22 is determined at different opening degrees, and then the opening pressure of the safety valve is determined based on the first oil pressure at each opening degree and the valve opening state of the safety valve. For example, the valve opening size of the safety valve corresponding to each first oil pressure is detected; if the valve opening size of the safety valve exceeds a preset threshold, the first oil pressure at the current opening degree is determined as the opening pressure of the safety valve.

[0070] Based on the above device, the opening pressure test of the pressure-limiting valve is more accurate, the consistency of the pressure-limiting valve test with the actual operating conditions of the engine is improved, the reliability of the pressure-limiting valve test result is improved, the opening pressure test of the safety valve, the durability test of the pressure-limiting valve, and the selection of the diameter of the pipeline from the main oil passage to the pressure-limiting valve are all considered, so that the oil pump test device is more perfect.

[0071] In a second aspect, Figure 5 A flowchart of an oil pump test method provided by an embodiment of the present application. The method is applied to the controller in any one of the above oil pump test devices, and the method includes the following steps.

[0072] In step 501, when the oil pump to be tested is normally operating, the opening degree of the first control valve is adjusted so that the first oil pressure measured by the first pressure sensor is equal to the first oil pressure threshold. ​

[0073] In actual application, to avoid the pressure limiting valve being frequently opened, a throttle valve can be additionally arranged on the third pipeline. In specific implementation, the opening degree of the first control valve is adjusted, so that the first oil pressure measured by the first pressure sensor is equal to the first oil pressure threshold value, then the opening degree of the second control valve is adjusted, so that the second oil pressure measured by the second pressure sensor is equal to the second oil pressure threshold value, and then the opening degree of the third control valve is adjusted, the first actual fluctuation amplitude of the second oil pressure under different opening degrees is determined, and the target opening degree corresponding to the first actual fluctuation amplitude matching the preset fluctuation amplitude is determined, and the opening degree of the third control valve is controlled at the target opening degree, so that the selection of the pipeline diameter from the main oil passage to the pressure limiting valve can be realized.

[0074] In step 502, the opening degree of the second control valve is adjusted, and the second oil pressure measured by the second pressure sensor under different opening degrees is determined.

[0075] In step 503, the opening pressure of the pressure limiting valve is determined based on the second oil pressure under each opening degree and the valve state of the pressure limiting valve of the oil pump to be tested.

[0076] In specific implementation, the valve opening size of the pressure limiting valve corresponding to each second oil pressure can be detected, and if the valve opening size of the pressure limiting valve exceeds a preset threshold value, the second oil pressure under the current opening degree is determined as the opening pressure of the pressure limiting valve.

[0077] After the opening pressure of the pressure limiting valve is determined, the opening degree of the second control valve can be controlled to be the opening degree corresponding to the second oil pressure threshold value, and the oil pump can be controlled to continuously operate for a preset time length, and then in each preset period, the second actual fluctuation amplitude is determined according to the second oil pressure measured by the second pressure sensor, each second actual fluctuation amplitude is compared with the preset fluctuation amplitude, and whether to update the target opening degree is judged based on the comparison result. The pressure limiting valve can also be disassembled every certain time to check the wear state, so as to determine the performance of the pressure limiting valve.

[0078] Through the above method, the conformity of the pressure limiting valve test to the actual operating condition of the engine is improved, and thus the reliability of the test result of the pressure limiting valve is improved.

[0079] After the oil pump test method and device of the example embodiment of the present application are introduced, next, the controller according to another example embodiment of the present application is introduced.

[0080] The controller 130 implemented according to this embodiment of the present application will be described below with reference to Figure 6 . Figure 6 The controller 130 shown is only an example, and should not bring any limitation to the functions and use range of the embodiments of the present application.

[0081] AsFigure 6 As shown, the controller 130 is represented as a form of a general controller. The components of the controller 130 can include, but are not limited to, the at least one processor 131 described above, the at least one memory 132 described above, and a bus 133 that connects the various system components, including the memory 132 and the processor 131.

[0082] The bus 133 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a processor or local bus using any of a variety of bus architectures, and the like.

[0083] The memory 132 can include a read-only memory (ROM) 1323 in the form of a non- volatile memory unit, a random access memory (RAM) 1321, and / or a cache memory 1322 that provides volatile storage of application data and code, and the like for the controller 130.

[0084] The memory 132 can also include a program / utility 1325 having a set of programs / modules 1324 of the controller 130, including an operating system, one or more application programs, other program modules, and program data, and the like, each or some combination thereof, which can include implementation of a network environment.

[0085] The controller 130 can also communicate with one or more external devices 134 such as a keyboard, a pointing device, etc.; other devices such as are well known in the art; and / or with one or more devices that enable a user to interact with the controller 130 in a network environment. Such interaction can occur through input / output (I / O) interface(s) 135. Further, the controller 130 can communicate with one or more networks such as a local area network (LAN), a wide area network (WAN), and / or the Internet through a network adapter 136. As depicted, the network adapter 136 communicates with the other components of the controller 130 through the bus 133. It should be appreciated that although the network adapter 136 is depicted as a separate component of the controller 130, the network adapter 136 can be integrated with the bus 133, the processor 131, the memory 132, and / or other components of the controller 130. It should also be appreciated that the controller 130 can communicate with one or more other controllers in a networked environment, such as a cloud computing environment, through the network adapter 136. It should be appreciated that the controller 130 can be a part of one or more devices, such as a personal computer, a server, a handheld device, a consumer electronic device, a network router, switches or other devices, and the like.

[0086] In an exemplary embodiment, a storage medium is also provided, which, when a computer program in the storage medium is executed by a processor of a controller, the controller is capable of performing the engine oil pump test method described above. Optionally, the storage medium can be a non-transitory computer readable storage medium, such as a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0087] In an example embodiment, the controller of the present application can include at least one processor, and a memory connected with the at least one processor in communication, wherein the memory stores a computer program executable by the at least one processor, and the computer program, when executed by the at least one processor, can cause the at least one processor to perform the steps of any of the engine oil pump test methods provided by the embodiments of the present application.

[0088] In an example embodiment, a computer program product is also provided, and when the computer program product is executed by the controller, the controller can implement any of the example methods provided by the present application.

[0089] Furthermore, the computer program product can employ any combination of one or more of the following: a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disc, a RAM, a ROM, an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0090] The program product for the engine oil pump test in the embodiments of the present application can employ a CD-ROM and include program codes, and can run on a computing device. However, the program product of the present application is not limited thereto, and in this document, the readable storage medium can be any tangible medium containing or storing a program, which can be used by or in conjunction with an instruction execution system, device, or apparatus.

[0091] The readable signal medium can include a data signal carried in a baseband or as a part of a carrier wave, in which a readable program code is borne. Such a propagated data signal can take on multiple forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The readable signal medium can also be any readable medium that is not a readable storage medium and that can transmit, propagate, or transport a program for use by or in connection with an instruction execution system, device, or apparatus.

[0092] The program code contained in the readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, radio frequency (RF), or the like, or any suitable combination of the above.

[0093] The program code may, for example, be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's computing device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device or entirely on the remote computing device or server. In the latter scenario, the remote computing device can be connected to the user's computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computing device

[0094] It should be noted that, although the above detailed description refers to several units or sub-units of the apparatus, such a division is merely illustrative and not mandatory. Indeed, according to an embodiment of the application, features and functions of two or more units described above can be embodied in one unit. Conversely, features and functions of one unit described above can be further divided into several units.

[0095] Moreover, while operations of the methods of the present application are described in a particular order in the drawings, this is not required or implied in any way, and one can perform the operations in any order, or perform only some of the operations, or perform the operations in a different order, or perform the operations at different times, or perform all the operations at once, and still achieve desirable results.

[0096] Those skilled in the art will appreciate that embodiments of the present application can be devised for a method, a system, or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0097] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 one or more flowcharts and / or blocks

[0098] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 one or more flowcharts and / or blocks

[0099] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flowcharts and / or blocks Figure 1 one or more flowcharts and / or blocks

[0100] While the preferred embodiments of the application have been described, additional variations and modifications can be employed by those skilled in the art. Therefore, the appended claims intend to cover all such modifications and variations as fall within the true spirit and scope of the application.

[0101] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. An oil pump testing device, characterized in that, The device includes: an oil tank, a first pressure sensor, a second pressure sensor, a first control valve, a second control valve, and a controller; The first end of the first control valve is connected to the oil outlet of the oil pump under test via a first pipe; the second end of the first control valve is connected to the first end of a second pipe; the first end of the second control valve is connected to the second end of the second pipe; the third end of the second pipe is connected to the first end of a third pipe; and the second end of the third pipe is connected to the input end of the pressure relief valve of the oil pump under test. The second end of the second control valve extends into the oil tank via a fourth pipe. The output end of the pressure relief valve extends into the oil tank via a fifth pipe. The first pressure sensor is mounted on the first pipe, and the second pressure sensor is mounted on the second pipe. The controller is signal-connected to the first pressure sensor, the second pressure sensor, the first control valve, and the second control valve. The controller is configured to, when the oil pump under test is operating normally, adjust the opening of the first control valve so that the first oil pressure measured by the first pressure sensor is equal to the first oil pressure threshold; adjust the opening of the second control valve to determine the second oil pressure measured by the second pressure sensor at different openings; and determine the opening pressure of the pressure limiting valve based on the second oil pressure at each opening and the valve state of the pressure limiting valve.

2. The apparatus as claimed in claim 1, characterized in that, The device also includes a third control valve: The third control valve is installed on the third pipeline and is signal-connected to the controller; After adjusting the opening of the first control valve to make the first oil pressure measured by the first pressure sensor equal to the first oil pressure threshold, the controller adjusts the opening of the second control valve. Before determining the second oil pressure measured by the second pressure sensor at different openings, the controller is further configured to: Adjust the opening of the second control valve so that the second oil pressure measured by the second pressure sensor is equal to the second oil pressure threshold; adjust the opening of the third control valve to determine the first actual fluctuation amplitude of the second oil pressure under different openings, and determine the target opening corresponding to the first actual fluctuation amplitude that matches the preset fluctuation amplitude, and control the opening of the third control valve at the target opening.

3. The apparatus as described in claim 2, characterized in that, After determining the opening pressure of the pressure relief valve, the controller is further used to: The opening degree of the second control valve is controlled to be the opening degree corresponding to the second oil pressure threshold; the oil pump is controlled to run continuously for a preset time.

4. The apparatus as described in claim 3, characterized in that, During the process of controlling the oil pump to run continuously for a preset time, the controller is also used for: In each preset cycle, a second actual fluctuation amplitude is determined based on the second oil pressure measured by the second pressure sensor; Each second actual fluctuation amplitude is compared with the preset fluctuation amplitude, and the target opening degree is updated based on the comparison result.

5. The apparatus according to any one of claims 1 to 4, characterized in that, The controller is specifically used for: The valve opening size of the pressure relief valve corresponding to each second oil pressure is detected; if the valve opening size of the pressure relief valve exceeds a preset threshold, the second oil pressure at the current opening size is determined as the opening pressure of the pressure relief valve.

6. A method for testing an oil pump, applied to the controller in the oil pump testing apparatus according to any one of claims 1 to 5, characterized in that, The method includes: When the oil pump under test is working normally, adjust the opening of the first control valve so that the first oil pressure measured by the first pressure sensor is equal to the first oil pressure threshold. Adjust the opening degree of the second control valve, and determine the second oil pressure measured by the second pressure sensor under different opening degrees; Based on the second oil pressure at each opening degree and the valve status of the pressure relief valve of the oil pump under test, the opening pressure of the pressure relief valve is determined.

7. The method as described in claim 6, characterized in that, After adjusting the opening of the first control valve to make the first oil pressure measured by the first pressure sensor equal to the first oil pressure threshold, and before adjusting the opening of the second control valve to determine the second oil pressure measured by the second pressure sensor at different openings, the method further includes: Adjust the opening of the second control valve so that the second oil pressure measured by the second pressure sensor is equal to the second oil pressure threshold. Adjust the opening of the third control valve to determine the first actual fluctuation amplitude of the second oil pressure under different openings, and determine the target opening corresponding to the first actual fluctuation amplitude that matches the preset fluctuation amplitude, and control the opening of the third control valve to the target opening.

8. The method as described in claim 7, characterized in that, After determining the opening pressure of the pressure relief valve, the method further includes: The opening degree of the second control valve is controlled to be the opening degree corresponding to the second oil pressure threshold; the oil pump is controlled to run continuously for a preset time.

9. The method as described in claim 7, characterized in that, The process of controlling the oil pump to run continuously for a preset duration also includes: In each preset cycle, a second actual fluctuation amplitude is determined based on the second oil pressure measured by the second pressure sensor; Each second actual fluctuation amplitude is compared with the preset fluctuation amplitude, and the target opening degree is updated based on the comparison result.

10. The method according to any one of claims 6 to 9, characterized in that, The determination of the opening pressure of the pressure relief valve based on the second oil pressure at each opening degree and the valve state of the pressure relief valve includes: The valve opening size of the pressure relief valve corresponding to each second oil pressure is detected; If the opening size of the pressure relief valve exceeds a preset threshold, the second oil pressure at the current opening size is determined as the opening pressure of the pressure relief valve.

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