Control method and system for an aeroengine test stand

Abstract

The present disclosure relates to a control method for an aero-engine test stand comprising a hydraulic servo regulating valve, comprising: monitoring test working conditions of the aero-engine test stand; and controlling the hydraulic servo regulating valve in a safe state according to different test working conditions. The different test working conditions include: occurrence of a sudden state and triggering of an emergency signal, loss of a control signal of the hydraulic servo regulating valve, and abnormality of a position feedback signal of the hydraulic servo regulating valve.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an aero-engine test stand, in particular to control for an aero-engine test stand. BACKGROUND

[0002] Both aero-engine compressor test stand and fan test stand are atmospheric intake, high-power variable frequency motor test piece test stand. A plurality of regulating valves are arranged in parallel on the atmospheric intake pipeline and the test piece exhaust pipeline, for regulating valve opening, intake flow, exhaust pressure, test piece throttle ratio and pressure ratio and other test state parameters. In the test process, the regulating valve as a key controlled object needs to be effectively controlled, especially in the performance recording and surge test of the test piece, the regulating valve also needs to have the ability of rapid response opening, so the regulating valve is designed as a hydraulic servo control mode.

[0003] The hydraulic servo regulating valve is usually equipped with a position sensor representing the valve opening and a hydraulic servo valve driving the valve opening. In the test process, the hydraulic servo regulating valve may have non-accidental and unpredictable failures, such as loss of valve opening position signal, loss of valve control signal, and sudden state of test.

[0004] Therefore, in the design of the electrical control system of the test stand, the control in different abnormal states needs to be considered comprehensively to ensure the safe operation of the fan test piece or the compressor test piece. SUMMARY

[0005] The technical solution of the present disclosure combines the characteristics of the hydraulic servo regulating valve, and designs the regulating valve to be able to respond to different states of control, so as to ensure the safe operation of the fan test piece or the compressor test piece.

[0006] In an embodiment of the present disclosure, a control method for an aero-engine test stand is provided, the aero-engine test stand comprising a hydraulic servo regulating valve, comprising: monitoring the test working condition of the aero-engine test stand; and depending on different test working conditions, the hydraulic servo regulating valve is controlled in a safe state accordingly.

[0007] In another embodiment of the present disclosure, the different test working conditions include: occurrence of a sudden state and triggering of an emergency signal, loss of control signal of the hydraulic servo regulating valve, and abnormality of position feedback signal of the hydraulic servo regulating valve.

[0008] In still another embodiment of the present disclosure, the position feedback signal of the hydraulic servo regulating valve comes from a position feedback sensor configured on the hydraulic servo regulating valve to represent the valve opening.

[0009] In another embodiment of the disclosure, the position feedback signal of the hydraulic servo regulating valve includes a primary position feedback signal of the hydraulic servo regulating valve and a secondary position feedback signal of the hydraulic servo regulating valve.

[0010] In yet another embodiment of the disclosure, the position feedback sensor indicative of the valve opening includes a primary position feedback sensor and a secondary position feedback sensor.

[0011] In another embodiment of the disclosure, the position feedback signal abnormality of the hydraulic servo regulating valve includes a loss of the primary position feedback signal of the hydraulic servo regulating valve, a loss of the secondary position feedback signal of the hydraulic servo regulating valve, and a difference between the primary position feedback signal and the secondary position feedback signal of the hydraulic servo regulating valve exceeding a threshold value.

[0012] In yet another embodiment of the disclosure, controlling the hydraulic servo regulating valve in the safe state includes preventing the valve opening of the hydraulic servo regulating valve from being zero.

[0013] In an embodiment of the disclosure, a control system for an aero-engine test stand is provided, the aero-engine test stand including a hydraulic servo regulating valve, the control system including: a valve control module, further including: a working condition monitoring module monitoring a test working condition of the aero-engine test stand; and a safety control module controlling the hydraulic servo regulating valve in a safe state according to different test working conditions.

[0014] In another embodiment of the disclosure, the different test working conditions monitored by the working condition monitoring module include: occurrence of a sudden state and triggering of an emergency signal, loss of a control signal of the hydraulic servo regulating valve, and position feedback signal abnormality of the hydraulic servo regulating valve.

[0015] In yet another embodiment of the disclosure, the hydraulic servo regulating valve is configured with a position feedback sensor indicative of the valve opening, and the position feedback signal of the hydraulic servo regulating valve is from the position feedback sensor.

[0016] In another embodiment of the disclosure, the position feedback signal of the hydraulic servo regulating valve includes a primary position feedback signal of the hydraulic servo regulating valve and a secondary position feedback signal of the hydraulic servo regulating valve.

[0017] In yet another embodiment of the disclosure, the position feedback sensor indicative of the valve opening further includes a primary position feedback sensor and a secondary position feedback sensor.

[0018] In another embodiment of the disclosure, the position feedback signal abnormality of the hydraulic servo regulating valve includes a loss of the primary position feedback signal of the hydraulic servo regulating valve, a loss of the secondary position feedback signal of the hydraulic servo regulating valve, and a difference between the primary position feedback signal and the secondary position feedback signal of the hydraulic servo regulating valve exceeding a threshold value.

[0019] In yet another embodiment of the present disclosure, the safety control module controlling the hydraulic servo regulating valve in the safety state includes preventing the valve opening of the hydraulic servo regulating valve from being zero.

[0020] This summary is provided to introduce some concepts of the following detailed description in a simplified form that are further described below in the detailed description. This summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended for use in limiting the scope of the claimed subject matter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above summary of the present disclosure and the following detailed description of the specific embodiments are better understood when read in conjunction with the appended drawings. It should be understood that the various embodiments of the claimed invention, although not necessarily mutually exclusive, provide one or more solutions each potentially having one or more advantages. For the purposes of summarizing the disclosure, some concepts have been presented in a simplified summary form that is provided to

[0022] Figure 1 A flow chart of a control method of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown.

[0023] Figure 2 A block diagram of a control system of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown.

[0024] Figure 3 A flow chart of a hardware implementation of a preset process of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown.

[0025] Figure 4 A flow chart of a control process of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown, in which the hydraulic servo regulating valve is controlled in the safety state according to different test conditions.

[0026] Figure 5 A block diagram of a hardware implementation of a control system of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown.

[0027] Figure 6 A hardware circuit diagram of a control system of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present disclosure more apparent, the specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0029] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. The present disclosure may, however, be practiced without the specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present disclosure.

[0030] Aircraft engine compressor test benches and fan test benches typically have multiple regulating valves arranged in parallel on the intake and exhaust pipes of the test specimen. These valves are used to adjust test parameters such as valve opening, intake flow rate, exhaust pressure, throttling ratio, and pressure ratio of the test specimen. During testing, the regulating valves are key controlled objects and require effective control.

[0031] Hydraulic servo control valves are typically equipped with a position sensor characterizing the valve opening and a hydraulic servo valve to drive the valve opening. During testing, hydraulic servo control valves may experience non-accidental and unpredictable failures, such as loss of valve opening position signal, loss of valve control signal, and sudden test conditions. Considering the characteristics of hydraulic servo control valves, the valve design is tailored to handle different control states, thereby ensuring the safe operation of fan or compressor test specimens.

[0032] Figure 1 A flowchart is shown of a control method 100 for a hydraulic servo regulating valve on a test bench according to an embodiment of the present disclosure.

[0033] In section 102, we prepared for the experiment and made preliminary plans.

[0034] Based on the requirements of the test conditions, the system pre-determines which regulating valve will participate in adjusting the test conditions. Each regulating valve is equipped with a servo valve, which has an "Enable / Disable" function to set whether the regulating valve is controllable.

[0035] The hardware implementation of the preset process of the hydraulic servo regulating valve of the test bench according to an embodiment of the present disclosure will be described below. Figure 3 describe.

[0036] At 104, monitor the test conditions.

[0037] When monitoring test conditions, the following need to be monitored:

[0038] Unexpected situations may occur during the test (e.g., abnormalities in the test piece or hydraulic oil leakage), in which case an emergency signal can be triggered manually or automatically.

[0039] The hydraulic servo control valve is equipped with a hydraulic servo valve that drives the valve opening. The control signal for the control valve is used to control this hydraulic servo valve to control the size of the valve opening. The control signal for the control valve may malfunction, such as being lost.

[0040] The hydraulic servo regulating valve is also provided with a position feedback sensor for representing the valve opening degree. One or more position feedback sensors can be provided as needed. In an embodiment of the present disclosure, two position feedback sensors for representing the valve opening degree are provided on the hydraulic servo regulating valve. One of the position feedback sensors is installed on the hydraulic actuator cylinder of the regulating valve to reflect the current valve opening degree by measuring the stroke of the hydraulic actuator cylinder, and the other position feedback sensor is installed on the valve body of the regulating valve to reflect the current valve opening degree by measuring the length of the valve stretch or the angle of the valve rotation. The two position sensors are defined as a “primary” position feedback and a “secondary” position feedback, respectively, for monitoring whether the valve state is normal. The position feedback signal of the position feedback sensor can be lost or abnormal.

[0041] At 106, the regulating valve is controlled in a safe state for different test conditions.

[0042] When the test condition appears in a burst state 108, the regulating valve control signal is lost 110, the position feedback signal is lost 112, and the position feedback signal is abnormal 116, etc., the test needs to be stopped to control the regulating valve in a safe state.

[0043] The above refers to Figure 1 The electrical control method of the test stand hydraulic servo regulating valve described above can be executed by a corresponding electrical control system. Figure 2 A block diagram of a control system 200 of a test stand hydraulic servo regulating valve according to an embodiment of the present disclosure is shown.

[0044] In the present embodiment, the control system 200 of the test stand hydraulic servo regulating valve includes a valve control module 202. The valve control module 202 further includes a condition monitoring module 206 and a safety control module 208.

[0045] The condition monitoring module 206 monitors the test condition. When monitoring the test condition, the condition monitoring module 206 needs to monitor:

[0046] An emergency signal can be triggered manually or automatically during the test process when a burst state (for example, abnormal test piece, hydraulic oil leakage) occurs.

[0047] The hydraulic servo regulating valve is provided with a hydraulic servo valve for driving the valve opening degree. The regulating valve control signal is controlled for the hydraulic servo valve to control the size of the valve opening degree. The regulating valve control signal can be abnormal, for example, lost.

[0048] The hydraulic servo regulating valve is also provided with a position feedback sensor for representing the valve opening degree. One or more position feedback sensors can be provided as needed. The position feedback signal of the position feedback sensor can be lost or abnormal.

[0049] The safety control module 208 controls the regulating valve to be in a safe state for different test conditions.

[0050] When the test condition is in an emergency state 108, the regulating valve control signal is lost 110, the position feedback signal is lost 112, or the position feedback signal is abnormal 116, the safety control module 208 needs to send a control signal to the emergency button 218 and the hydraulic servo valve 216 to stop the test, so as to control the regulating valve to be in a safe state.

[0051] In an embodiment of the present disclosure, the electrical control system of the hydraulic servo regulating valve of the test bed includes an electrical control computer 502, a programmable controller PLC 504 (including a CPU module, a communication module, an I / O module), a valve control module RMC 506, a signal conversion and isolation module 508 (4-20 mA to -10V-+10V), an emergency button 510, a safety relay 512, a relay 516, and a DC power supply 518, etc. (as shown in Figure 5 The computer 502, the programmable controller PLC 504, and the valve control module RMC 506 exchange data through communication means, and realize the adjustment of the valve opening, the inlet air flow, the exhaust pressure, the test piece throttle ratio, and the pressure ratio, etc. test state parameters in the test condition of the test bed.

[0052] Those skilled in the art can understand that the control system composed of the software modules as described above, or the control system composed of part of the software modules and part of the hardware can be used as the electrical control system of the hydraulic servo regulating valve of the test bed. The embodiment of the present disclosure is only an example of the electrical control system of the hydraulic servo regulating valve of the test bed, but not a limitation.

[0053] The hardware implementation of the preset process of the hydraulic servo regulating valve of the test bed according to an embodiment of the present disclosure will be described below in combination with Figure 3 and Figure 5

[0054] At 302, enter the test preparation phase, and start the preset.

[0055] At 304, based on the "Enable / Disable" function of the servo valve configured on the regulating valve, the test condition requirement can be combined to preset which regulating valve will participate in the adjustment of the test condition in the test on the human-machine operation interface (HMI) of the control system computer 502. That is, whether the valve is controllable is selected by the "Enable / Disable" function of the servo valve. If the "Enable" function of the servo valve is selected, the valve is controllable; otherwise, if the "Disable" function of the servo valve is selected, the valve is not controllable.

[0056] ​The selection of whether the valve is controllable is sent to the programmable controller PLC CPU via a signal at 304. When the selection is controllable (YES at 304), a switching signal is output by the DO module of the PLC 504 (306A) to energize the relay 516, so that the "Enable / Disable" electrical interface of the hydraulic servo valve is input with a signal (308A) (for example, a 24V DC voltage value), so that the "Enable / Disable" electrical interface of the hydraulic servo valve on the regulating valve participating in the test obtains a 24V DC voltage. Thus, the electrical control system controls the hydraulic servo valve according to the test condition (310A).

[0057] When the selection is controllable (NO at 304), the DO module of the PLC 504 does not output a switching signal (306B), so that the "Enable / Disable" electrical interface of the hydraulic servo valve is not input with a signal (308B), so that the "Enable / Disable" electrical interface of the hydraulic servo valve on the regulating valve not participating in the test does not have a 24V DC voltage signal. Thus, the electrical control system does not control the hydraulic servo valve (310B), and the valve is in the full open state of the failure position.

[0058] The following will be described in conjunction with Figure 4 and Figure 5 The flow chart of the control process of the test bench hydraulic servo regulating valve according to different test conditions according to an embodiment of the present disclosure is shown.

[0059] At 402, the hydraulic servo regulating valve is controlled according to different test conditions.

[0060] At 404, it is judged whether a sudden state (such as an abnormal test piece, hydraulic oil leakage) occurs during the test and triggers an emergency signal (manually or manually).

[0061] If it is judged YES at 404, the test piece speed is reduced and the exhaust regulating valve is fully opened at 406.

[0062] In an embodiment of the present disclosure, the signal of the emergency button 510 is directly sent by means of electrical "hard-wire" connection, the working power of the servo valve on the regulating valve is cut off by the safety relay 512, so that the regulating valve is quickly opened from the current position to the fully open position, and the test is stopped (422).

[0063] If the determination at 404 is negative, then proceed to 408 to determine if the control signal of the hydraulic servo valve configured on the regulating valve has been lost. If the determination at 404 is positive, then at 410, after determining that the regulating valve has not received a control signal, put the regulating valve into a disabled state, opening it from its current position to full open to ensure the safe operation of the test piece. Further, at 422, stop the test and inspect the regulating valve.

[0064] If the determination at 408 is negative, then at 412 the system continues to determine whether the "main" position feedback signal, which represents the valve opening degree, is lost. If the determination at 412 is positive, then at 414, the valve control module RMC 506 has not received the "main" position feedback signal, so the control mode of the control valve is switched from closed-loop control to open-loop control, and the control valve servo valve control signal is assigned a value near 0V, that is, the control valve is maintained at its current opening degree. At this time, the human-machine interface of the electrical control system computer 502 will display a fault message indicating that the "main" position feedback signal is lost. Further, at 422, the test is stopped and the control valve is inspected.

[0065] If the determination at 412 is negative, then at 416, it continues to determine whether the "secondary" position feedback signal, which characterizes the valve opening, is lost. If the determination at 416 is positive, then at 418, the valve control module RMC 506 still has control over the control valve, keeping it in the valve position required for the test safety state. At this time, the human-machine interface of the electrical control system computer 502 will display a fault message indicating the loss of the "secondary" position feedback signal. Further, at 422, the test is stopped, and the control valve is inspected.

[0066] If the judgment at 416 is negative, then proceed to 420 to determine whether the difference between the position values ​​measured by the two position feedback sensors representing the valve opening is within the allowable range. If the judgment at 420 is positive, then return to 402 and continue to control the hydraulic servo regulating valve according to different test conditions.

[0067] If the result is negative at step 420, then at step 422, stop the test and check the regulating valve. At this time, the human-machine interface of the electrical control system computer 502 will display this alarm information.

[0068] Figure 6 The diagram shows a hardware circuit diagram of a control system for a hydraulic servo regulating valve on a test bench according to an embodiment of the present disclosure. Figure 6 Is it like this? Figure 5 The diagram shown is a hardware implementation circuit of a control system for a hydraulic servo regulating valve on a test bench according to an embodiment of the present disclosure.

[0069] The electrical control system of the hydraulic servo regulating valve of the test bed comprises an electrical control computer, a programmable controller PLC (including a CPU module, a communication module, an I / O module), a valve control module RMC, a signal conversion and isolation module, an emergency button, a safety relay, a relay, and the like.

[0070] An emergency signal is sent through the emergency button which can be manually or automatically triggered in case of an unexpected state during the test (for example, an abnormality of the test piece, leakage of hydraulic oil).

[0071] The hydraulic servo regulating valve is configured with a hydraulic servo valve for driving the opening degree of the valve. The regulating valve control signal (COMMAND) is controlled for the hydraulic servo valve to control the size of the opening degree of the valve. The regulating valve control signal can be abnormal, for example, lost. The hydraulic servo valve also has an "Enable / Disable" electrical interface for the control system to select whether to control the servo valve. The control signal of the hydraulic servo valve is sent from the control module to the hydraulic servo valve through the signal conversion and isolation module. The "Enable / Disable" signal of the hydraulic servo valve is sent from the PLC_DO module to the hydraulic servo valve through the relay. In an embodiment, the signal conversion and isolation module converts the 4-20mA signal to the -10V-+10V signal and isolates / filters the noise signal.

[0072] The hydraulic servo regulating valve is also configured with a position feedback sensor representing the opening degree of the valve. The position feedback sensor can be configured as one or more as needed. The position feedback signal generated by the position feedback sensor is transmitted to the control module.

[0073] In an embodiment of the present disclosure, two position feedback sensors representing the opening degree of the valve are configured on the hydraulic servo regulating valve. One of the position feedback sensors is installed on the hydraulic actuator cylinder of the regulating valve, and the current opening degree of the valve is reflected by measuring the stroke of the hydraulic actuator cylinder; the other position feedback sensor is installed on the valve body of the regulating valve, and the current opening degree of the valve is reflected by measuring the length of the valve stretched or the angle of the valve rotated. The two position sensors are defined as "main" position feedback and "secondary" position feedback, respectively, for monitoring whether the valve state is normal. The "main" and "secondary" position feedback signals are transmitted to the control module.

[0074] In the electrical control design of the regulating valve, the working DC power supply of the position sensor representing the opening degree of the valve, the working DC power supply of the servo valve, and the "Enable / Disable" DC power supply of the servo valve are separately powered to prevent one power failure from affecting the other two, and facilitate troubleshooting and analysis.

[0075] In an embodiment of the present disclosure, a function of limiting the valve opening value can also be added in the software design, that is, the minimum value of the valve opening is set on the human-computer interface of the electric control computer 502, so as to prevent the valve opening from being set to 0 (full-closed value) from the operation level.

[0076] The various steps and modules of the control method and system for the aero-engine test stand described above can be implemented in hardware, software, or a combination thereof. If implemented in hardware, the various illustrative steps, modules, and circuits described in connection with the present disclosure can be implemented or executed with a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic components, hardware components, or any combination thereof. The general-purpose processor can be a processor, a microprocessor, a controller, a microcontroller, or a state machine, etc. If implemented in software, the various illustrative steps, modules described in connection with the present disclosure can be stored or transmitted as one or more instructions or code on a computer-readable medium. The software modules implementing the various operations of the present disclosure can reside in a storage medium, such as a RAM, a flash memory, a ROM, an EPROM, an EEPROM, a register, a hard disk, a removable disk, a CD-ROM, a cloud storage, etc. The storage medium can be coupled to the processor so that the processor can read information from or write information to the storage medium, and execute the corresponding program modules to implement the various steps of the present disclosure. Moreover, the software-based embodiment can be uploaded, downloaded, or remotely accessed through appropriate communication means. Such appropriate communication means include, for example, the Internet, the World Wide Web, an intranet, a software application, a cable (including an optical fiber cable), a magnetic communication, an electromagnetic communication (including RF, microwave, and infrared communication), an electronic communication, or other such communication means.

[0077] It should also be noted that the embodiments can be described as a process which is depicted as a flowchart, a flow diagram, a structure diagram, or a block diagram. Although a flowchart can describe the operations as a sequential process, many of the operations can be performed in parallel or concurrently. In addition, the order of the operations can be re-arranged.

[0078] The disclosed methods, apparatus, and systems should not be limited in any way. Rather, the present disclosure encompasses all novel and non-obvious features and aspects of the various disclosed embodiments, alone and in various combinations and sub-combinations with one another. The disclosed methods, apparatus, and systems are not limited to any specific aspect or feature or combination of them, nor do any of the disclosed embodiments require the presence of any particular advantage or solve a particular or all technical problems.

[0079] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, but not restrictive, and many changes can be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of protection of the claims, and these all fall within the scope of protection of the present application.

Claims

1. A control method for an aero-engine test stand, the aero-engine test stand comprising a hydraulic servo-regulating valve, comprising: presetting, in combination with test condition requirements, hydraulic servo-regulating valves to be involved in a test to regulate a test condition of the aero-engine test stand, wherein the presetting is performed by a servo valve "Enable / Disable" function of the hydraulic servo-regulating valve, wherein if a hydraulic servo-regulating valve is to be involved in a test to regulate a test condition of the aero-engine test stand, an "Enable" function of a servo valve thereof is selected, otherwise a "Disable" function of a servo valve thereof is selected; monitoring a test condition of the aero-engine test stand; and controlling the hydraulic servo-regulating valve in a safe state in response to different test conditions, wherein the different test conditions include: an emergency state occurs and triggers an emergency signal, a control signal of the hydraulic servo-regulating valve is lost, and a position feedback signal of the hydraulic servo-regulating valve is abnormal, and wherein: if an emergency state occurs and triggers an emergency signal, a working power supply of the servo valve is cut off, so that the hydraulic servo-regulating valve is rapidly opened from a current position to a full open position and the test is stopped; if the control signal of the servo valve is lost, the hydraulic servo-regulating valve is in a failure state, and is opened from a current position to a full open position and the test is stopped.

2. The control method according to claim 1, characterized by, The position feedback signal of the hydraulic servo-regulating valve is from a position feedback sensor configured to the hydraulic servo-regulating valve and representing a valve opening degree.

3. The control method according to claim 1, characterized by, The position feedback signal of the hydraulic servo-regulating valve includes a primary position feedback signal of the hydraulic servo-regulating valve and a secondary position feedback signal of the hydraulic servo-regulating valve.

4. The control method according to claim 3, characterized by, The position feedback sensor representing a valve opening degree includes a primary position feedback sensor and a secondary position feedback sensor.

5. The control method according to claim 4, characterized by, The position feedback signal of the hydraulic servo-regulating valve being abnormal includes the primary position feedback signal of the hydraulic servo-regulating valve being lost, the secondary position feedback signal of the hydraulic servo-regulating valve being lost, and a difference between the primary position feedback signal and the secondary position feedback signal of the hydraulic servo-regulating valve exceeding a threshold value, and the method further comprises if the primary position feedback signal from the primary position feedback sensor is lost, a control mode of the hydraulic servo-regulating valve is switched from a closed-loop control mode to an open-loop control, while a servo valve control signal is assigned to be around 0V, and the test is stopped; if the secondary position feedback signal from the secondary position feedback sensor is lost, the hydraulic servo-regulating valve is controlled at a valve position in a test safe state, and the test is stopped; if the difference between the primary position feedback signal and the secondary position feedback signal of the hydraulic servo-regulating valve exceeds the threshold value, the test is stopped.

6. The control method according to claim 1, characterized by, Controlling the hydraulic servo-regulating valve in a safe state includes preventing the valve opening degree of the hydraulic servo-regulating valve from being zero.

7. A control system for an aero-engine test stand, the aero-engine test stand comprising a hydraulic servo-regulating valve, the control system comprising: a preset module, which presets a hydraulic servo regulating valve to be involved in a test to adjust a test condition of the aero-engine test stand according to a test condition requirement, wherein the preset is performed by an "Enable / Disable" function of a servo valve of the hydraulic servo regulating valve, and if the hydraulic servo regulating valve is to be involved in the test to adjust the test condition of the aero-engine test stand, an "Enable" function of the servo valve is selected, otherwise a "Disable" function of the servo valve is selected; a valve control module, further comprising: a condition monitoring module, which monitors the test condition of the aero-engine test stand; and a safety control module, which controls the hydraulic servo regulating valve in a safety state according to different test conditions, wherein the different test conditions include an emergency state and an emergency signal, a loss of a control signal of the hydraulic servo regulating valve, and an abnormality of a position feedback signal of the hydraulic servo regulating valve, and wherein: if the emergency state and the emergency signal occur, a working power supply of the servo valve is cut off, so that the hydraulic servo regulating valve is rapidly opened from a current position to a full open position and the test is stopped; if the control signal of the servo valve is lost, the hydraulic servo regulating valve is in a failure state, and is opened from the current position to the full open position and the test is stopped.

8. The control system of claim 7, wherein, The hydraulic servo regulating valve is configured with a position feedback sensor representing a valve opening degree, and the position feedback signal of the hydraulic servo regulating valve is from the position feedback sensor.

9. The control system of claim 7, wherein, The position feedback signal of the hydraulic servo regulating valve includes a main position feedback signal of the hydraulic servo regulating valve and a secondary position feedback signal of the hydraulic servo regulating valve.

10. The control system of claim 9, wherein, The position feedback sensor representing the valve opening degree further includes a main position feedback sensor and a secondary position feedback sensor.

11. The control system of claim 10, wherein, The abnormality of the position feedback signal of the hydraulic servo regulating valve includes a loss of the main position feedback signal of the hydraulic servo regulating valve, a loss of the secondary position feedback signal of the hydraulic servo regulating valve, and a difference between the main position feedback signal and the secondary position feedback signal of the hydraulic servo regulating valve exceeding a threshold value, and the safety control module is further configured to: if the main position feedback signal from the main position feedback sensor is lost, the control mode of the hydraulic servo regulating valve is switched from a closed-loop control mode to an open-loop control mode, while the servo valve control signal is assigned to be around 0V, and the test is stopped; if the secondary position feedback signal from the secondary position feedback sensor is lost, the hydraulic servo regulating valve is controlled at a valve position in a test safety state, and the test is stopped; and if the difference between the main position feedback signal and the secondary position feedback signal of the hydraulic servo regulating valve exceeds the threshold value, the test is stopped.

12. The control system of claim 7, wherein, The safety control module controlling the hydraulic servo regulating valve in the safety state includes preventing the valve opening degree of the hydraulic servo regulating valve from being zero.

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