Lubricating oil pressure adjusting system for lubricating oil low-pressure limitation test and test method

Abstract

The invention relates to a lubricating oil pressure adjusting system for a lubricating oil low-pressure limitation test and a test method. The lubricating oil pressure adjusting system for the lubricating oil low-pressure limitation test comprises a lubricating oil supply path (10) configured to supply lubricating oil to an engine lubricating system; the lubricating oil bypass (20) is communicated with the lubricating oil supply path (10) and is configured to shunt the lubricating oil running in the lubricating oil supply path (10); and the variable opening valve (21) is arranged in the lubricating oil bypass (20) and is configured to adjust the lubricating oil shunted by the lubricating oil supply path (10) through the lubricating oil bypass (20) by changing the opening so as to control the lubricating oil pressure provided for the engine lubricating system.

Description

Technical Field

[0001] The present disclosure relates to the field of airworthiness tests for aeroengine lubricating oil systems, and particularly to a lubricating oil pressure adjustment system and a test method for a lubricating oil low-pressure limit test. Background Art

[0002] The lubricating oil system (also known as the lubrication system) of an aeroengine is a system that provides lubricating oil to the bearing cavities, bearings, gearboxes, gears, or splines of the engine to achieve the functions of lubrication, cooling, and cleaning of these parts. It is a key subsystem to ensure the reliable operation of the engine. By continuously supplying oil to the bearings, the bearings can be kept in a state of being efficiently cooled and lubricated.

[0003] To ensure that the bearings can obtain sufficient cooling and lubrication, the type certificate data sheet (TCDS, which is part of the type certificate and is used to record the conditions and limitations necessary to meet the certification airworthiness requirements) of the aeroengine stipulates the minimum lubricating oil pressure limit under normal operating conditions, and through durability full-engine tests represented by 150-hour endurance tests, it is verified that the damage of each component in the bearing cavity within the available limit under the minimum lubricating oil pressure limit, thereby indicating the operating safety and reliability of the engine bearings within the lubricating oil pressure design envelope.

[0004] During the verification process of the endurance test, the test cycle needs to maintain the lubricating oil system pressure at the low-pressure limit value in a complete cycle to simulate the state of partial blockage and leakage of the engine lubricating oil circuit within the design expected range. The oil circuit of the test engine lubricating oil system is in good condition under normal operating conditions, and it is usually difficult to reach the minimum lubricating oil pressure limit value of the lubricating oil system during the test implementation process. Moreover, there are multiple thrust conditions in an endurance test cycle of the test cycle. With the changes in thrust and lubricating oil temperature under different thrust conditions, it is difficult for the lubricating oil pressure to reach the corresponding minimum lubricating oil pressure limit value for different thrust conditions. Summary of the Invention

[0005] In view of this, the embodiments of the present disclosure provide a lubricating oil pressure adjustment system and a test method for a lubricating oil low-pressure limit test, which can more easily reach the minimum lubricating oil pressure limit value of the lubricating oil system during the test implementation process.

[0006] In one aspect of the present disclosure, there is provided a lubricating oil pressure adjustment system for a lubricating oil low-pressure limit test, including:

[0007] A lubricating oil supply oil path configured to supply lubricating oil to the engine lubrication system;

[0008] A lubricating oil bypass path communicating with the lubricating oil supply oil path and configured to divert the lubricating oil flowing in the lubricating oil supply oil path; and

[0009] A variable-opening valve is provided in the lubricating oil bypass passage and is configured to adjust the lubricating oil shunted from the lubricating oil supply passage through the lubricating oil bypass passage by changing the opening degree, so as to control the lubricating oil pressure supplied to the engine lubrication system.

[0010] In some embodiments, the lubricating oil pressure adjustment system for lubricating oil low-pressure limit test further includes:

[0011] A lubricating oil return passage;

[0012] Wherein, the lubricating oil bypass passage is communicated with the lubricating oil return passage to recycle the shunted lubricating oil to the lubricating oil return passage.

[0013] In some embodiments, the lubricating oil pressure adjustment system for lubricating oil low-pressure limit test further includes:

[0014] A one-way valve is provided in the lubricating oil bypass passage and conducts unidirectionally along the direction from the lubricating oil supply passage to the lubricating oil return passage.

[0015] In some embodiments, the lubricating oil pressure adjustment system for lubricating oil low-pressure limit test further includes:

[0016] A controller is signal-connected to the variable-opening valve and is configured to adjust the opening degree of the variable-opening valve according to the minimum lubricating oil pressure limit value corresponding to the engine thrust to be tested, so as to control the lubricating oil pressure supplied to the engine lubrication system to meet the minimum lubricating oil pressure limit value.

[0017] In some embodiments, the lubricating oil supply passage includes an oil supply pump, a first oil supply pipe section and a second oil supply pipe section. The first oil supply pipe section, the second oil supply pipe section and the lubricating oil bypass passage are connected through a tee fitting. The oil supply pump is arranged on the first oil supply pipe section, and the second oil supply pipe section is connected to the engine lubrication system.

[0018] In some embodiments, the lubricating oil pressure adjustment system for lubricating oil low-pressure limit test further includes:

[0019] A pressure sensor has a pressure sensing end located on the second oil supply pipe section,

[0020] Wherein, the controller is signal-connected to the pressure sensor and is configured to adjust the opening degree of the variable-opening valve according to the inlet pressure of the engine lubrication system sensed by the pressure sensor, so as to control the lubricating oil pressure supplied to the engine lubrication system to meet the minimum lubricating oil pressure limit value.

[0021] In some embodiments, the controller is configured to first preliminarily adjust the opening degree of the variable opening valve according to the minimum oil pressure limit value corresponding to the engine thrust to be tested, and then finely adjust the opening degree of the variable opening valve according to the inlet pressure of the engine lubrication system sensed by the pressure sensor, so as to control the oil pressure provided to the engine lubrication system to conform to the minimum oil pressure limit value.

[0022] In some embodiments, the engine full-load test includes multiple engine thrust conditions, and there are at least two different minimum oil pressure limit values corresponding to the engine thrusts under the multiple engine thrust conditions. The controller is configured to determine the corresponding minimum oil pressure limit value according to the engine thrust to be tested by calculating according to a preset function or by looking up a table.

[0023] In one aspect of the present disclosure, there is provided a test method for an oil pressure adjustment system for a low oil pressure limit test according to the foregoing, including:

[0024] Determine the engine thrust under at least one engine thrust condition in the engine full-load test, and control the oil pressure provided to the engine lubrication system to conform to the minimum oil pressure limit value corresponding to the engine thrust under each engine thrust condition, so as to perform the low oil pressure limit test under this engine thrust condition.

[0025] In some embodiments, the at least one engine thrust condition includes multiple engine thrust conditions, and there are at least two different minimum oil pressure limit values corresponding to the engine thrusts under the multiple engine thrust conditions. After completing the low oil pressure limit test under one engine thrust condition, the low oil pressure limit test under the next engine thrust condition is performed;

[0026] Wherein, under each engine thrust condition, the steps of controlling the oil pressure provided to the engine lubrication system to conform to the minimum oil pressure limit value corresponding to the engine thrust under this engine thrust condition include:

[0027] Determine the corresponding minimum oil pressure limit value according to the engine thrust to be tested by calculating according to a preset function or by looking up a table, and determine the opening target value of the variable opening valve according to the minimum oil pressure limit value;

[0028] Adjust the opening degree of the variable opening valve to the opening target value;

[0029] According to the inlet pressure of the engine lubrication system, finely adjust the opening degree of the variable opening valve so that the oil pressure provided to the engine lubrication system conforms to the minimum oil pressure limit value.

[0030] Therefore, according to the embodiments of the present disclosure, a lubricating oil bypass passage that is connected to and shunts the lubricating oil supply passage for supplying lubricating oil to the engine lubrication system in the lubricating oil low-pressure limit test is provided. By changing the opening degree of the variable opening valve in the lubricating oil bypass passage, the lubricating oil shunted through the lubricating oil bypass passage is adjusted, thereby controlling the lubricating oil pressure supplied to the engine lubrication system, so that the inlet pressure supplied to the engine lubrication system can more easily reach and be maintained at the lubricating oil minimum pressure limit value during the test implementation process, and the inlet pressure can also be adjusted at any time as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings forming a part of the specification depict embodiments of the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0032] Referring to the drawings, the present disclosure can be more clearly understood from the following detailed description, wherein:

[0033] Figure 1 is a schematic structural diagram of some embodiments of a lubricating oil pressure adjustment system for a lubricating oil low-pressure limit test according to the present disclosure;

[0034] Figure 2 is a schematic diagram of the control signal relationship in some embodiments of a lubricating oil pressure adjustment system for a lubricating oil low-pressure limit test according to the present disclosure;

[0035] Figure 3 is a schematic flowchart of some embodiments of a test method according to the present disclosure.

[0036] It should be understood that the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of the components and steps, the components of the materials, the numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0038] As used in this disclosure, terms such as "first", "second" and the like do not denote any order, quantity or importance, but are merely used to distinguish different components. Words such as "comprising" or "including" mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In this disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0040] All terms used in this disclosure (including technical terms or scientific terms) have the same meaning as understood by those of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, for example, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0041] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the specification.

[0042] Figure 1 is a schematic structural diagram of some embodiments of a lubricating oil pressure adjustment system for a lubricating oil low-pressure limit test according to this disclosure. Refer to Figure 1 , embodiments of this disclosure provide a lubricating oil pressure adjustment system for a lubricating oil low-pressure limit test. The system includes: a lubricating oil supply oil path 10, a lubricating oil bypass oil path 20, and a variable opening valve 21. The lubricating oil supply oil path 10 is configured to supply lubricating oil to an engine lubrication system. The lubricating oil bypass oil path 20 is communicated with the lubricating oil supply oil path 10 and is configured to divert the lubricating oil flowing in the lubricating oil supply oil path 10. The variable opening valve 21 is disposed in the lubricating oil bypass oil path 20 and is configured to adjust the lubricating oil diverted from the lubricating oil supply oil path 10 through the lubricating oil bypass oil path 20 by changing the opening degree, so as to control the lubricating oil pressure supplied to the engine lubrication system EL.

[0043] The lubricating oil provided by the lubricating oil supply oil path 10 may come from a lubricating oil tank OT, which may include a flow path for the lubricating oil to flow, or may include a driving element for driving the lubricating oil to flow.

[0044] The lubricating oil bypass passage 20 can divert the lubricating oil flowing in the lubricating oil supply passage 10, and the oil pressure at the position where the end away from the lubricating oil supply passage 10 is connected is lower than the oil pressure upstream of the diversion position of the lubricating oil supply passage 10, so that the lubricating oil flowing in the lubricating oil supply passage 10 can be smoothly diverted through the lubricating oil bypass passage 20.

[0045] The variable opening valve 21 can adopt an opening regulating valve based on electric control or electro-hydraulic control. The flow rate of the lubricating oil flowing through the variable opening valve 21 can be adjusted by adjusting the opening degree, and accordingly, the flow rate of the lubricating oil diverted from the lubricating oil supply passage 10 can be changed, so as to adjust the inlet pressure of the lubricating oil entering the engine lubrication system after diversion.

[0046] In this embodiment, in the lubricating oil low-pressure limit test, a lubricating oil bypass passage communicating with and diverting the lubricating oil supply passage that supplies lubricating oil to the engine lubrication system is provided. By changing the opening degree of the variable opening valve in the lubricating oil bypass passage, the lubricating oil diverted through the lubricating oil bypass passage is adjusted, so as to control the lubricating oil pressure supplied to the engine lubrication system. Compared with other methods of controlling the inlet pressure supplied to the engine lubrication system, for the case where the oil circuit state of the test engine lubrication system is good under normal working conditions, this embodiment can make the inlet pressure supplied to the engine lubrication system more easily reach and remain at the lubricating oil minimum pressure limit value during the test implementation process, and can also adjust the inlet pressure at any time as needed.

[0047] Reference Figure 1 In some embodiments, the lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test further includes a lubricating oil return passage 40. The lubricating oil bypass passage 20 is communicated with the lubricating oil return passage 40 to recover the diverted lubricating oil into the lubricating oil return passage 40. The oil pressure of the lubricating oil return passage 40 is usually significantly lower than the oil pressure of the lubricating oil supply passage 10, making the diversion of the lubricating oil bypass passage 20 from the lubricating oil supply passage 10 smoother, and the recovery of the lubricating oil can be achieved by flowing the diverted hydraulic oil into the lubricating oil return passage 40, so that the oil supply process is continuously circulated and the energy consumption is reduced.

[0048] To prevent the lubricating oil from flowing into the lubricating oil supply passage 10 through the lubricating oil bypass passage 20 due to abnormal pressure in the lubricating oil return passage 40, which may cause an increase in the inlet pressure and affect the stability of the engine lubrication system, reference Figure 1 In some embodiments, the lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test further includes a one-way valve 22. The one-way valve 22 is provided in the lubricating oil bypass passage 20 and conducts unidirectionally along the direction from the lubricating oil supply passage 10 to the lubricating oil return passage 40. In this way, even if the pressure in the lubricating oil return passage 40 is abnormal, the lubricating oil will not flow into the lubricating oil supply passage 10 through the lubricating oil bypass passage 20, thus ensuring the operation stability of the engine lubrication system.

[0049] Figure 2It is a schematic diagram of the control signal relationship in some embodiments of the lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test according to the present disclosure. Refer to Figure 2 In some embodiments, the lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test further includes a controller 30. The controller 30 is signal-connected to the variable opening valve 21 and is configured to adjust the opening of the variable opening valve 21 according to the minimum lubricating oil pressure limit value corresponding to the engine thrust to be tested, so as to control the lubricating oil pressure provided to the engine lubricating system to conform to the minimum lubricating oil pressure limit value.

[0050] The minimum lubricating oil pressure limit value here can take different values according to the engine thrust under different engine thrust conditions. This minimum lubricating oil pressure limit value is actually the designed minimum pressure value corresponding to the engine thrust, which is equivalent to the designed minimum pressure value to be verified in the test.

[0051] Taking an aero-engine as an example, to ensure that the bearings can obtain sufficient cooling and lubrication, the type certificate data sheet (TCDS) of the aero-engine stipulates the minimum lubricating oil pressure limit under normal operating conditions, and through durability full-engine tests represented by 150-hour endurance tests, it is verified that the damage of each component in the bearing cavity under the minimum lubricating oil pressure limit is within the available limit range, thereby indicating the operating safety and reliability of the engine bearings within the lubricating oil pressure design envelope.

[0052] During the verification process of the endurance test, the test cycle needs to maintain the lubricating oil system pressure at the low-pressure limit value in a complete cycle, so as to simulate the state of partial blockage and leakage of the engine lubricating oil path within the designed expected range. And there are multiple thrust conditions in a single endurance test cycle of the test cycle, and the minimum lubricating oil pressure limit values under different thrust conditions vary.

[0053] In this way, the controller can adjust the opening of the variable opening valve according to the minimum lubricating oil pressure limit value corresponding to the engine thrust to be tested under each thrust condition, so as to control the lubricating oil pressure provided to the engine lubricating system to conform to the minimum lubricating oil pressure limit value, and can adjust the opening of the variable opening valve under different engine thrusts so that the lubricating oil pressure provided to the engine lubricating system under each thrust condition can conform to the minimum lubricating oil pressure limit value corresponding to the thrust condition.

[0054] Refer to Figure 1 In some embodiments, the lubricating oil supply path 10 includes a lubricating oil pump 11, a first supply pipe section 12, and a second supply pipe section 13. The first supply pipe section 12, the second supply pipe section 13, and the lubricating oil bypass path 20 are connected through a tee fitting 50. The lubricating oil pump 11 is arranged on the first supply pipe section 12, and the second supply pipe section 13 is connected to the engine lubricating system.

[0055] When modifying the lubricating oil system, the oil pipes in the lubricating oil supply line 10 can be divided into a first supply pipe section 12 and a second supply pipe section 13, and two interfaces of a three-way pipe fitting 50 are connected between the first supply pipe section 12 and the second supply pipe section 13, and the third interface of the three-way pipe fitting 50 is connected to the lubricating oil bypass path 20, so as to conveniently realize the modification of the lubricating oil system.

[0056] The oil supply pump 11 can suck the lubricating oil in the lubricating oil tank OT and boost the pressure. The lubricating oil can flow into the first supply pipe section 12 after filtering impurities through the filter 14. After the lubricating oil in the first supply pipe section 12 flows to the three-way pipe fitting 50, a part of the lubricating oil flows to the lubricating oil return line 40 through the lubricating oil bypass path 20, and another part of the lubricating oil flows to the engine lubrication system through the second supply pipe section 13, for example, flows to the servo fuel heater in the engine lubrication system.

[0057] Reference Figure 1 and Figure 2 In some embodiments, the lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test further includes a pressure sensor 60. The pressure sensor 60 has a pressure sensing end located in the second supply pipe section 13. The controller 30 is in signal connection with the pressure sensor 60 and is configured to adjust the opening degree of the variable opening valve 21 according to the inlet pressure of the engine lubrication system sensed by the pressure sensor 60, so as to control the lubricating oil pressure provided to the engine lubrication system to meet the lubricating oil minimum pressure limit value.

[0058] The controller can adjust the opening degree of the variable opening valve according to the lubricating oil minimum pressure limit value corresponding to the engine thrust to be tested, or can also adjust the opening degree of the variable opening valve according to the inlet pressure of the engine lubrication system sensed by the pressure sensor.

[0059] The controller can also adjust the opening degree of the variable opening valve according to both the lubricating oil minimum pressure limit value corresponding to the engine thrust to be tested and the inlet pressure of the engine lubrication system sensed by the pressure sensor. In some embodiments, the controller 30 is configured to first preliminarily adjust the opening degree of the variable opening valve 21 according to the lubricating oil minimum pressure limit value corresponding to the engine thrust to be tested, and then finely adjust the opening degree of the variable opening valve 21 according to the inlet pressure of the engine lubrication system sensed by the pressure sensor 60, so as to control the lubricating oil pressure provided to the engine lubrication system to meet the lubricating oil minimum pressure limit value.

[0060] In some embodiments, the engine full-load test includes multiple engine thrust conditions, and the lubricating oil minimum pressure limit values corresponding to the engine thrusts under the multiple engine thrust conditions are at least two different. The controller 30 is configured to determine the corresponding lubricating oil minimum pressure limit value according to the engine thrust to be tested by means of calculating according to a preset function or looking up a table.

[0061] The corresponding relationship between the engine thrust, the designed minimum lubricating oil pressure limit value, and the valve opening of the variable opening valve can be determined in advance through multiple tests, and a mapping table can be formed according to the corresponding relationship between the parameters, or a function can be determined by fitting or other means.

[0062] Based on the foregoing embodiments of the lubricating oil pressure adjustment system for low lubricating oil pressure limit tests, the embodiments of the present disclosure also provide a test method according to the embodiments of the lubricating oil pressure adjustment system for low lubricating oil pressure limit tests. The test method includes: determining the engine thrust under at least one engine thrust condition in the engine full-scale test, and controlling the lubricating oil pressure provided to the engine lubrication system to conform to the minimum lubricating oil pressure limit value corresponding to the engine thrust under this engine thrust condition at each engine thrust condition, so as to conduct the low lubricating oil pressure limit test under this engine thrust condition.

[0063] In some embodiments, the at least one engine thrust condition includes multiple engine thrust conditions, and the minimum lubricating oil pressure limit values corresponding to the engine thrusts under the multiple engine thrust conditions are at least two different, and after the low lubricating oil pressure limit test for one engine thrust condition is completed, the low lubricating oil pressure limit test for the next engine thrust condition is conducted.

[0064] At each engine thrust condition, the step of controlling the lubricating oil pressure provided to the engine lubrication system to conform to the minimum lubricating oil pressure limit value corresponding to the engine thrust under this engine thrust condition includes: determining the corresponding minimum lubricating oil pressure limit value from the engine thrust to be tested by calculating according to a preset function or by looking up a table, and determining the opening target value of the variable opening valve 21 according to the minimum lubricating oil pressure limit value; adjusting the opening of the variable opening valve 21 to the opening target value; and finely adjusting the opening of the variable opening valve 21 according to the inlet pressure of the engine lubrication system, so that the lubricating oil pressure provided to the engine lubrication system conforms to the minimum lubricating oil pressure limit value.

[0065] In this way, by first determining the corresponding minimum lubricating oil pressure limit value according to the engine thrust to be tested to roughly adjust the variable opening valve, and then finely adjusting the variable opening valve according to the inlet pressure of the engine lubrication system, the minimum lubricating oil pressure limit value can be more accurately achieved.

[0066] Take Figure 3 as an example, the test method includes:

[0067] Step S1: Determine the engine thrust under at least one engine thrust condition in the engine full-scale test. During the 150-hour full-scale endurance test for verifying the low pressure limit value of the lubricating oil system, there are multiple thrust conditions in one endurance test cycle, and each thrust condition corresponds to an engine thrust.

[0068] Step S2. Under the first engine thrust condition, determine the corresponding minimum oil pressure limit value according to the preset function by calculation or look-up table method based on the engine thrust under this thrust condition to be tested, and determine the opening target value of the variable opening valve according to the minimum oil pressure limit value;

[0069] Step S3. Adjust the opening of the variable opening valve to the opening target value;

[0070] Step S4. According to the inlet pressure of the engine lubrication system, finely adjust the opening of the variable opening valve so that the oil pressure provided to the engine lubrication system conforms to the minimum oil pressure limit value;

[0071] Step S5. Conduct the oil low pressure limit test under this engine thrust condition, and then return to Steps S2 - S5 to adjust the oil pressure under the next engine thrust condition.

[0072] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed here based on the above description.

[0073] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A lubricating oil pressure adjustment system for a lubricating oil low pressure limit test, characterized in that, Comprising: A lubricating oil supply circuit (10), configured to supply lubricating oil to an engine lubrication system; A lubricating oil bypass circuit (20), communicating with the lubricating oil supply circuit (10), configured to divert the lubricating oil flowing in the lubricating oil supply circuit (10); And A variable opening valve (21), disposed within the lubricating oil bypass circuit (20), configured to adjust the lubricating oil diverted from the lubricating oil supply circuit (10) through the lubricating oil bypass circuit (20) by changing the opening degree, so as to control the lubricating oil pressure supplied to the engine lubrication system.

2. The lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test according to claim 1, characterized in that, Further comprising: A lubricating oil return circuit (40); Wherein, the lubricating oil bypass circuit (20) communicates with the lubricating oil return circuit (40) to recover the diverted lubricating oil into the lubricating oil return circuit (40).

3. The lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test according to claim 2, characterized in that, Further comprising: A check valve (22), disposed within the lubricating oil bypass circuit (20), and unidirectionally conducting along the direction from the lubricating oil supply circuit (10) to the lubricating oil return circuit (40).

4. The lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test according to claim 1, characterized in that, Further comprising: A controller (30), signal-connected to the variable opening valve (21), configured to, according to the minimum lubricating oil pressure limit value corresponding to the engine thrust to be tested, cause the variable opening valve (21) to adjust the opening degree, so as to control the lubricating oil pressure supplied to the engine lubrication system to conform to the minimum lubricating oil pressure limit value.

5. The lubricating oil pressure adjustment system for the lubricating oil low-pressure limit test according to claim 4, wherein The lubricating oil supply circuit (10) includes a supply oil pump (11), a first supply oil pipe section (12) and a second supply oil pipe section (13), the first supply oil pipe section (12), the second supply oil pipe section (13) and the lubricating oil bypass circuit (20) are connected through a tee fitting (50), the supply oil pump (11) is disposed on the first supply oil pipe section (12), and the second supply oil pipe section (13) is connected to the engine lubrication system.

6. The lubricating oil pressure adjustment system for the lubricating oil low pressure limit test according to claim 5, characterized in that, Further comprising: A pressure sensor (60), having a pressure sensing end located at the second supply oil pipe section (13), Wherein, the controller (30) is signal-connected to the pressure sensor (60), configured to, according to the inlet pressure of the engine lubrication system sensed by the pressure sensor (60), cause the variable opening valve (21) to adjust the opening degree, so as to control the lubricating oil pressure supplied to the engine lubrication system to conform to the minimum lubricating oil pressure limit value.

7. The lubricating oil pressure adjustment system for the lubricating oil low pressure limit test according to claim 6, wherein, The controller (30) is configured to first cause the variable opening valve (21) to preliminarily adjust the opening degree according to the minimum lubricating oil pressure limit value corresponding to the engine thrust to be tested, and then cause the variable opening valve (21) to finely adjust the opening degree according to the inlet pressure of the engine lubrication system sensed by the pressure sensor (60), so as to control the lubricating oil pressure supplied to the engine lubrication system to conform to the minimum lubricating oil pressure limit value.

8. The lubricating oil pressure adjustment system for lubricating oil low-pressure limit test according to any one of claims 4-7, characterized in that, The engine full machine test includes multiple engine thrust conditions, and at least two of the minimum lubricating oil pressure limit values corresponding to the engine thrusts under the multiple engine thrust conditions are different, the controller (30) is configured to determine the corresponding minimum lubricating oil pressure limit value according to the engine thrust to be tested by means of calculating according to a preset function or looking up a table.

9. A test method for a lubricating oil pressure adjustment system used in a lubricating oil low-pressure limit test according to any one of claims 4-8, characterized in that, Comprising: Determine the engine thrust under at least one engine thrust condition in the engine full-scale test, and control the lubricating oil pressure supplied to the engine lubricating system to meet the minimum lubricating oil pressure limit value corresponding to the engine thrust under this engine thrust condition at each engine thrust condition, so as to conduct the lubricating oil low-pressure limit test under this engine thrust condition.

10. The test method according to claim 9, wherein, The at least one engine thrust condition includes a plurality of engine thrust conditions, and the minimum lubricating oil pressure limit values corresponding to the engine thrusts under the plurality of engine thrust conditions are at least two different. After completing the lubricating oil low-pressure limit test for one engine thrust condition, conduct the lubricating oil low-pressure limit test for the next engine thrust condition; Among them, at each engine thrust condition, the step of controlling the lubricating oil pressure supplied to the engine lubricating system to meet the minimum lubricating oil pressure limit value corresponding to the engine thrust under this engine thrust condition includes: Determine the corresponding minimum lubricating oil pressure limit value from the engine thrust to be tested by calculating according to a preset function or by looking up a table, and determine the opening target value of the variable opening valve (21) according to the minimum lubricating oil pressure limit value; Adjust the opening of the variable opening valve (21) to the opening target value; According to the inlet pressure of the engine lubricating system, finely adjust the opening of the variable opening valve (21) so that the lubricating oil pressure supplied to the engine lubricating system meets the minimum lubricating oil pressure limit value.

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