Self-detection method, system, device and storage medium for over-speed protection system

Abstract

The present invention discloses a self-detection method, system, device and storage medium for an over-speed protection system. The method adopts the power turbine speed as a trigger condition and can respectively perform self-detection on the hardware circuit and control switch of the over-speed logic processing unit of the over-speed protection system, so as to facilitate rapid fault location when the over-speed protection function fails. Moreover, the self-detection process of the hardware circuit and the control switch of the over-speed logic processing unit will not cause actual fuel cut-off, thereby eliminating the need for special development of engine start-up detection programs. Moreover, dynamic detection can be performed in an actual installation and use environment without the need for special ground detection equipment. Therefore, the over-speed protection function can be self-detected during normal engine testing and operation, ensuring that the over-speed protection function is intact during engine operation.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformer error calibration, and in particular to a self-detection method and system of an over-rotation protection system, electronic equipment, and a computer-readable storage medium. Background Art

[0002] For aviation gas turbine engines, uncontrolled overspeed of the engine power turbine rotor may cause catastrophic consequences such as uncontrollable fire and uncontained high-energy debris. According to relevant standards and specifications, aviation gas turbine engines should be designed with overspeed protection devices. When the speed of the engine power turbine rotor exceeds the specified safe speed, it should be able to immediately control the engine to exit this overspeed working state by cutting off the fuel or taking other effective measures. At present, domestic and foreign aviation gas turbine engine products usually adopt an independent overspeed protection system design in the engine control system to measure the engine speed. When overspeed occurs, the fuel supply to the combustion chamber is cut off by outputting a control signal to the actuator. Specifically, if Figure 1 As shown, the existing overspeed protection system includes a speed signal acquisition unit, an overspeed protection logic processing unit, and an execution unit. The speed signal acquisition unit collects the power turbine speed signal in real time and transmits the collected data to the overspeed protection logic processing unit. When the power turbine speed exceeds the set protection speed, the overspeed protection logic processing unit outputs a control signal to connect the two control terminals of the control coil of the fuel shut-off mechanism. Once energized, the control coil closes the fuel shut-off valve, thereby cutting off the fuel supply to the engine. However, there is currently no technology for self-testing the overspeed protection system, making it impossible to confirm whether the overspeed protection function is intact. Summary of the Invention

[0003] The present invention provides a self-detection method and system for an over-speed protection system, an electronic device, and a computer-readable storage medium, which can perform self-detection on the hardware circuit and control switch of the over-speed logic processing unit of the over-speed protection system respectively, and can perform dynamic detection in an actual installation and use environment.

[0004] According to one aspect of the present invention, a self-detection method for an over-speed protection system is provided, wherein the over-speed protection system includes an over-speed protection logic processing unit, a speed acquisition unit, and a fuel cut-off mechanism, and includes the following contents:

[0005] After the engine is started normally, the power turbine speed is collected. When the power turbine speed exceeds a first preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the first preset speed and prohibit over-speed output;

[0006] The control terminal of the control coil of the fuel cut-off mechanism is controlled to be positively connected, and the potential of the control terminal is monitored. If the potential of the control terminal is consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the control terminal self-test have passed, and the control terminal of the control coil of the fuel cut-off mechanism is controlled to be positively disconnected;

[0007] When the power turbine speed exceeds a second preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the second preset speed and prohibit over-speed output, wherein the second preset speed is higher than the first preset speed and lower than the over-speed protection threshold;

[0008] The negative control terminal of the control coil of the fuel cut-off mechanism is connected, and the potential of the negative control terminal is monitored. If the potential of the negative control terminal remains consistent with the potential of the negative power supply within a preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the negative control terminal self-test have passed, and the negative control terminal of the control coil of the fuel cut-off mechanism is controlled to be disconnected.

[0009] Furthermore, it also includes the following:

[0010] Give the engine stop command, collect the engine status changes, and judge whether the fuel cut-off mechanism self-detection has passed based on the engine status changes.

[0011] Furthermore, the process of collecting engine status changes and determining whether the fuel cutoff mechanism self-detection has passed based on the engine status includes the following:

[0012] The potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil is monitored. If the potential of the positive control terminal is consistent with the positive potential of the power supply, and the potential of the negative control terminal is consistent with the negative potential of the power supply, this moment is used as the initial moment, and the gas generator speed at the initial moment is collected. The gas generator speed is collected again after a preset time. If the difference between the gas generator speeds at the two moments is greater than or equal to a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed.

[0013] Furthermore, the process of collecting engine status changes and determining whether the fuel cutoff mechanism self-detection has passed based on the engine status includes the following:

[0014] The fuel flow rate entering the engine fuel nozzle is detected. If the fuel flow rate is lower than a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed.

[0015] In addition, the present invention also provides a self-detection system for an over-speed protection system, wherein the over-speed protection system includes an over-speed protection logic processing unit, a speed acquisition unit, and a fuel cut-off mechanism, including:

[0016] A potential monitoring circuit is used to monitor the potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil;

[0017] Over-speed detection control module, used to control the on-off of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil;

[0018] The overspeed detection processing module is configured to, when the power turbine speed exceeds a first preset speed, control the overspeed protection logic processing unit to adjust the overspeed protection threshold to the first preset speed and prohibit overspeed output, and control the overspeed protection logic processing unit to output a command to connect the positive control terminal to the overspeed detection control module. If the potential of the positive control terminal remains consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the positive control terminal of the overspeed protection logic processing unit have passed self-test, and the positive control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected. The module is also configured to, when the power turbine speed exceeds a second preset speed, control the overspeed protection logic processing unit to adjust the overspeed protection threshold to the second preset speed and prohibit overspeed output, and control the overspeed protection logic processing unit to output a command to connect the negative control terminal to the overspeed detection control module. If the potential of the negative control terminal remains consistent with the negative potential of the power supply within a preset time, it is determined that the hardware circuit and the negative control terminal of the overspeed protection logic processing unit have passed self-test, and the negative control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected.

[0019] Furthermore, it also includes:

[0020] The second speed acquisition circuit is used to acquire the speed of the gas generator;

[0021] The overspeed detection processing module is further configured to, after an engine stop command is issued, if it is monitored that the positive potential of the control terminal is consistent with the positive potential of the power supply and the negative potential of the control terminal is also consistent with the negative potential of the power supply, then use this moment as the initial moment and control the second speed acquisition circuit to acquire the gas generator speed at the initial moment; after a preset time has passed, control the second speed acquisition circuit to acquire the gas generator speed again; and if the difference between the gas generator speeds at the two moments is greater than or equal to a preset threshold, determine that the fuel cutoff mechanism self-test has passed.

[0022] Furthermore, it also includes:

[0023] A fuel flow detection device, used to detect the fuel flow entering the engine fuel nozzle;

[0024] The over-speed detection processing module is further used to control the operation of the fuel flow detection device after the engine stop command is given. If the fuel flow is lower than a preset threshold, it is determined that the fuel cut-off mechanism self-detection has passed.

[0025] In addition, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor is configured to execute the steps of the above method by calling the computer program stored in the memory.

[0026] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for performing self-detection of an over-speed protection system. When the computer program is run on a computer, the steps of the method described above are executed.

[0027] The present invention has the following beneficial effects:

[0028] The self-detection method of the over-speed protection system of the present invention uses the power turbine speed as a trigger condition, and can perform self-detection on the over-speed logic processing unit hardware circuit and control switch of the over-speed protection system respectively, so as to facilitate rapid fault location when the over-speed protection function fails. Moreover, the self-detection process of the over-speed logic processing unit hardware circuit and the control switch will not cause actual fuel cut-off, so there is no need to specially develop an engine start-up detection program, and dynamic detection can be performed in the actual installation and use environment without the need for special ground detection equipment. Therefore, the over-speed protection function can be self-detected during normal engine testing and operation, ensuring that the over-speed protection function is intact during engine operation.

[0029] In addition, the self-detection system of the over-rotation protection system of the present invention also has the above advantages.

[0030] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 It is a schematic diagram of the module structure of the over-rotation protection system.

[0033] Figure 2 It is a flow chart of the self-detection method of the over-rotation protection system of the preferred embodiment of the present application.

[0034] Figure 3 This is another flow chart of the self-detection method of the over-rotation protection system according to the preferred embodiment of the present application.

[0035] Figure 4 It is a schematic diagram of the module structure of the self-detection system of the over-rotation protection system of another embodiment of the present application. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0037] Reference Figure 2 A preferred embodiment of the present application provides a self-detection method for an over-speed protection system, wherein the over-speed protection system includes an over-speed protection logic processing unit, a speed acquisition unit, and a fuel cut-off mechanism. The self-detection method includes the following:

[0038] Step S1: After the engine is started normally, the power turbine speed is collected. When the power turbine speed exceeds a first preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the first preset speed and prohibit over-speed output;

[0039] Step S2: Controlling the control terminal of the fuel cutoff mechanism control coil to be positively connected, and monitoring the potential of the control terminal positively. If the potential of the control terminal positively remains consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the control terminal positively self-test have passed, and the control terminal of the fuel cutoff mechanism control coil is controlled to be positively disconnected.

[0040] Step S3: When the power turbine speed exceeds a second preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the second preset speed and prohibit over-speed output, wherein the second preset speed is higher than the first preset speed and lower than the over-speed protection threshold;

[0041] Step S4: The negative control terminal of the fuel cutoff mechanism control coil is controlled to be connected, and the potential of the negative control terminal is monitored. If the potential of the negative control terminal remains consistent with the potential of the negative power supply within a preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the negative control terminal self-test have passed, and the negative control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected.

[0042] It will be appreciated that the self-test method of the over-speed protection system of this embodiment measures the power turbine speed after normal engine startup. If the power turbine speed exceeds a first preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the first preset speed and prohibit the over-speed output. At this time, the over-speed protection logic processing unit no longer outputs a control signal to directly control the positive connection of the control terminal of the fuel cutoff mechanism control coil. Instead, the control terminal of the fuel cutoff mechanism control coil is controlled to be positively connected via another control module. The potential of the positive control terminal is then monitored. If the potential of the positive control terminal remains consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the positive control terminal of the over-speed protection logic processing unit have passed the self-test. When the power turbine speed exceeds a second preset speed, the overspeed protection logic processing unit is controlled to adjust the overspeed protection threshold value to the second preset speed and prohibit its overspeed output. At this time, the overspeed protection logic processing unit no longer outputs a control signal to directly control the negative control terminal of the fuel cut-off mechanism control coil to be connected, but instead controls the negative control terminal of the fuel cut-off mechanism control coil to be connected through other control modules. The potential of the negative control terminal is then monitored. If the potential of the negative control terminal remains consistent with the potential of the negative power supply within a preset time, it is determined that the hardware circuit and the negative control terminal self-test of the overspeed protection logic processing unit have passed. The self-detection method of the over-speed protection system of the present invention uses the power turbine speed as a trigger condition, and can perform self-detection on the over-speed logic processing unit hardware circuit and control switch of the over-speed protection system respectively, so as to facilitate rapid fault location when the over-speed protection function fails. Moreover, the self-detection process of the over-speed logic processing unit hardware circuit and the control switch will not cause actual fuel cut-off, so there is no need to specially develop an engine start-up detection program, and dynamic detection can be performed in the actual installation and use environment without the need for special ground detection equipment. Therefore, the over-speed protection function can be self-detected during normal engine testing and operation, ensuring that the over-speed protection function is intact during engine operation.

[0043] It can be understood that after the engine is started normally, the engine electronic controller will output an instruction to allow over-speed protection self-detection, and the speed acquisition unit of the over-speed protection system will collect the power turbine speed in real time. When the power turbine speed exceeds the first preset speed Np1, the over-speed protection logic processing unit is controlled to temporarily adjust the over-speed protection threshold value to the first preset speed Np1 and prohibit over-speed output. At this time, although the power turbine speed is greater than the temporary threshold value of over-speed protection, the over-speed protection logic processing unit does not simultaneously connect the control terminal positive and the control terminal negative of the fuel cut-off mechanism control coil, which will not cause actual fuel cut-off. The over-speed protection logic processing unit will output an instruction to connect the control terminal positive to other control modules.

[0044] Then, after receiving the control instruction, other control modules will control the control end of the fuel cut-off mechanism control coil to be connected, and monitor the potential of the control end. If the potential of the control end is consistent with the positive potential of the power supply within the preset time, it means that the control switch of the control end is operating normally and the hardware circuit that outputs the control end connection instruction in the over-speed protection logic processing unit is working normally, thereby determining that the self-test of the control end hardware control circuit of the over-speed protection logic processing unit and the control switch of the control end have passed, otherwise it is determined that the self-test has failed.

[0045] Then, as the engine speed continues to increase during startup, when the power turbine speed exceeds the second preset speed Np2, where the overspeed protection threshold value > Np2 > Np1, the overspeed protection logic processing unit is controlled to temporarily adjust the overspeed protection threshold value to the second preset speed Np2 and prohibit its overspeed output. At this time, although the power turbine speed is greater than the temporary overspeed protection threshold value, the overspeed protection logic processing unit does not simultaneously connect the control terminal positive and the control terminal negative of the fuel cut-off mechanism control coil, which will not cause a real fuel cut-off. The overspeed protection logic processing unit will output an instruction to connect the control terminal negative to other control modules.

[0046] Then, after receiving the control instruction, other control modules will control the control terminal negative of the fuel cut-off mechanism control coil to be connected, and monitor the potential of the control terminal negative. If the potential of the control terminal negative is consistent with the potential of the power supply negative within the preset time, it means that the control switch of the control terminal negative is operating normally and the hardware circuit that outputs the control terminal negative connection instruction in the over-speed protection logic processing unit is operating normally, thereby determining that the self-test of the control terminal negative hardware control circuit and the control switch of the control terminal negative of the over-speed protection logic processing unit has passed. Otherwise, it is determined that the self-test has failed.

[0047] Alternatively, as Figure 3 As shown, the self-detection method of the over-rotation protection system further includes the following contents:

[0048] Step S5: giving an engine stop instruction, collecting engine status changes, and judging whether the fuel cut-off mechanism self-detection has passed according to the engine status changes.

[0049] Specifically, after the engine electronic controller gives the engine stop command, the over-speed protection logic processing unit of the over-speed protection system will directly control the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil to be connected, thereby controlling the operation of the fuel cut-off mechanism. By monitoring the state changes of the engine, it can be determined whether the fuel cut-off mechanism has passed the self-test based on the state changes of the engine after the fuel cut-off mechanism is operated.

[0050] It can be understood that the self-detection method of the present invention uses the engine stop command as a trigger condition, and can independently self-detect the fuel cut-off mechanism of the over-speed protection system. In combination with the above-mentioned self-detection of the over-speed logic processing unit hardware circuit and the control switch during the engine start-up process, a complete over-speed protection function self-detection can be completed during each engine start-up and shutdown process, and the fault can be quickly located when the over-speed protection function fails without human intervention.

[0051] The process of collecting engine status changes and determining whether the fuel cutoff mechanism has passed self-test based on the engine status includes the following:

[0052] The potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil is monitored. If the potential of the positive control terminal is consistent with the positive potential of the power supply, and the potential of the negative control terminal is consistent with the negative potential of the power supply, this moment is used as the initial moment, and the gas generator speed at the initial moment is collected. The gas generator speed is collected again after a preset time. If the difference between the gas generator speeds at the two moments is greater than or equal to a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed.

[0053] Specifically, after an engine shutdown command is issued, the potentials of the positive and negative control terminals of the fuel shutoff mechanism's control coil are collected. If the positive potential of the control terminal matches the positive potential of the power supply, and the negative potential of the control terminal matches the negative potential of the power supply, this indicates that both the positive and negative control switches are properly connected, meaning the fuel shutoff mechanism is operating normally. This moment is taken as the initial time T0, and the gas generator speed Ng0 at T0 is collected. After a preset time Ts seconds, the gas generator speed Ng1 is collected again. If Ng0 - Ng1 ≥ DNg, where DNg represents a preset speed drop threshold, it can be determined that the engine fuel has been properly shut off after the fuel shutoff mechanism has been activated, meaning that the fuel shutoff mechanism self-test has passed. Otherwise, the fuel shutoff mechanism self-test has failed.

[0054] It can be understood that the present invention uses an engine stop command as a trigger condition. After the stop command is triggered, the decrease in the gas generator speed is monitored. If the decrease in the gas generator speed is greater than or equal to a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed. Otherwise, it is determined that the fuel cut-off mechanism self-test has failed. The fuel cut-off mechanism can be self-tested in an actual installation and use environment.

[0055] Optionally, in another embodiment of the present invention, the process of collecting engine state changes and determining whether the fuel cutoff mechanism self-detection has passed based on the engine state includes the following:

[0056] The fuel flow rate entering the engine fuel nozzle is detected. If the fuel flow rate is lower than a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed.

[0057] Specifically, a flow detection element, such as a fuel flow meter, is provided on the pipeline connecting the fuel cut-off mechanism and the engine fuel nozzle. After the engine stop command is issued, the flow detection element is used to detect the fuel flow entering the engine fuel nozzle in real time. If the fuel flow is lower than a preset threshold, it means that the fuel cut-off mechanism is operating normally, and the fuel cut-off mechanism self-test is determined to have passed. Otherwise, the fuel cut-off mechanism self-test is determined to have failed.

[0058] As can be understood, the present invention monitors the fuel flow entering the engine's fuel nozzles. If the monitored fuel flow falls below a preset threshold after an engine shutdown command is issued, the fuel shutoff mechanism self-test is determined to have passed. This allows for intuitive and convenient fuel shutoff mechanism self-testing. Furthermore, due to the large size and weight of fuel flow meters, they are typically not installed in the engine's fuel nozzle supply lines to avoid increasing engine weight and preventing excessive engine vibration. Therefore, the fuel flow entering the engine's fuel nozzles is typically monitored using a fuel flow meter on a ground test bench. This means that the fuel shutoff mechanism self-test typically requires ground testing and cannot be performed in an actual installed environment.

[0059] In addition, if Figure 4 As shown, another embodiment of the present invention further provides a self-detection system for an over-speed protection system, preferably using the self-detection method described above, wherein the over-speed protection system includes an over-speed protection logic processing unit, a speed acquisition unit, and a fuel cut-off mechanism, and includes:

[0060] A potential monitoring circuit is used to monitor the potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil;

[0061] Over-speed detection control module, used to control the on-off of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil;

[0062] The overspeed detection processing module is configured to, when the power turbine speed exceeds a first preset speed, control the overspeed protection logic processing unit to adjust the overspeed protection threshold to the first preset speed and prohibit overspeed output, and control the overspeed protection logic processing unit to output a command to connect the positive control terminal to the overspeed detection control module. If the potential of the positive control terminal remains consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the positive control terminal of the overspeed protection logic processing unit have passed self-test, and the positive control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected. The module is also configured to, when the power turbine speed exceeds a second preset speed, control the overspeed protection logic processing unit to adjust the overspeed protection threshold to the second preset speed and prohibit overspeed output, and control the overspeed protection logic processing unit to output a command to connect the negative control terminal to the overspeed detection control module. If the potential of the negative control terminal remains consistent with the negative potential of the power supply within a preset time, it is determined that the hardware circuit and the negative control terminal of the overspeed protection logic processing unit have passed self-test, and the negative control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected.

[0063] It can be understood that the self-detection system of the over-speed protection system of this embodiment uses the power turbine speed as a trigger condition, and can perform self-detection on the over-speed logic processing unit hardware circuit and control switch of the over-speed protection system respectively, so as to facilitate rapid fault location when the over-speed protection function fails. Moreover, the self-detection process of the over-speed logic processing unit hardware circuit and control switch will not cause actual fuel cut-off, so there is no need to specially develop an engine start-up detection program, and dynamic detection can be performed in the actual installation and use environment without the need for special ground detection equipment. Therefore, the over-speed protection function can be self-detected during normal engine testing and operation, ensuring that the over-speed protection function is intact during engine operation.

[0064] in addition, Figure 4 The first speed acquisition circuit is the speed acquisition unit of the over-speed protection system. Of course, in other embodiments of the present invention, a separate speed acquisition circuit may be provided to acquire the power turbine speed in real time. Furthermore, the potential monitoring circuit is an existing circuit, and its specific circuit principles are not further described here. Furthermore, the self-detection system of the present invention can be integrated into the over-speed protection system.

[0065] Optionally, the self-detection system further includes:

[0066] The second speed acquisition circuit is used to acquire the speed of the gas generator;

[0067] The overspeed detection processing module is further configured to, after an engine stop command is issued, if it is monitored that the positive potential of the control terminal is consistent with the positive potential of the power supply and the negative potential of the control terminal is also consistent with the negative potential of the power supply, then use this moment as the initial moment and control the second speed acquisition circuit to acquire the gas generator speed at the initial moment; after a preset time has passed, control the second speed acquisition circuit to acquire the gas generator speed again; and if the difference between the gas generator speeds at the two moments is greater than or equal to a preset threshold, determine that the fuel cutoff mechanism self-test has passed.

[0068] Specifically, when an engine shutdown command is issued, the potential monitoring circuit collects the potentials of the positive and negative control terminals of the fuel cutoff mechanism's control coil. If the positive control terminal's potential is consistent with the positive power supply potential, and the negative control terminal's potential is also consistent with the negative power supply potential, this indicates that both the positive and negative control switches are properly connected, meaning the fuel cutoff mechanism is operating normally. This moment is then used as the initial time, T0, and the overspeed detection processing module controls the second speed collection circuit to collect the gas generator speed Ng0 at time T0. After a preset time, Ts seconds, the second speed collection circuit is again controlled to collect the gas generator speed Ng1. If Ng0 - Ng1 ≥ DemNg, where DemNg represents a preset speed drop threshold, the overspeed detection processing module determines that the engine fuel has been properly cut off after the fuel cutoff mechanism has been activated, i.e., the fuel cutoff mechanism self-test has passed. Otherwise, the fuel cutoff mechanism self-test has failed.

[0069] It will be appreciated that the present invention uses an engine shutdown command as a trigger condition. After the shutdown command is triggered, the gas generator speed is collected via the second speed collection circuit, thereby monitoring the decrease in the gas generator speed. If the decrease in the gas generator speed is greater than or equal to a preset threshold, the fuel cut-off mechanism self-test is determined to have passed. Otherwise, the fuel cut-off mechanism self-test is determined to have failed. The fuel cut-off mechanism self-test can be performed in an actual installed environment.

[0070] It can be understood that the present invention sets two special working modes STATE1 and SRTATE2 inside the over-speed protection logic processing unit of the over-speed protection system. When the power turbine speed Np exceeds the detection points Np1 (i.e., the first preset speed) and Np2 (i.e., the second preset speed) preset inside the over-speed detection processing module, the CTR1 and CTR2 control circuits of the over-speed detection processing module will be triggered in sequence to output discrete signals respectively, which will respectively trigger the STATE1 and SRTATE2 working modes of the over-speed protection logic processing unit to take effect. In these two modes, the over-speed protection logic processing unit will adjust the threshold value of the over-speed protection speed to Np1 and Np2 respectively. When the overspeed is reached, the normal overspeed output is prohibited and the command signal is output to the overspeed detection control module instead. The overspeed detection control module connects the positive and negative control terminals of the fuel cut-off mechanism according to the command. In this way, the normal function of the overspeed protection logic processing unit and the control switch can be detected in each engine working cycle without performing a protection shutdown test. In addition, the overspeed detection processing module will also collect the speed of the engine's gas generator through the second speed collection circuit, and calculate the deviation of the engine Ng speed drop value from the preset target value within a fixed time Δt after the fuel cut-off mechanism control switch is fully closed according to the state of the potential feedback, so as to confirm whether the fuel cut-off mechanism is working normally.

[0071] As an example, the working process of the self-detection system of the present invention is as follows:

[0072] 1) The engine starts normally, and the engine electronic controller outputs the self-detection instruction to allow over-speed protection;

[0073] 2) The power turbine speed Np increases. When Np exceeds the detection point Np1 preset inside the over-speed detection processing module, the logic device inside the over-speed detection processing module will output a signal CTR1 to the over-speed protection logic processing unit, triggering the over-speed protection logic processing unit's working mode STATE1 to take effect;

[0074] 3) In STATE1 mode, the over-rotation protection logic processing unit adjusts the threshold value of the over-rotation protection to Np1 and prohibits over-rotation output, and the over-rotation protection logic processing unit outputs the instruction of connecting the control terminal to the over-rotation detection control module, and the over-rotation detection control module outputs the power supply positive voltage to the control terminal for t1 seconds;

[0075] 4) If the over-speed detection processing module obtains the potential of the control terminal and the power supply positive through potential monitoring within t1 seconds, it indicates that the over-speed protection logic processing unit hardware and the control switch of the control terminal have passed the self-test. After the holding time exceeds t1 seconds, the over-speed detection control module will disconnect the power supply positive and the control terminal positive again;

[0076] 5) When Np exceeds the detection point Np2 preset in the over-rotation detection processing module, the logic device inside the over-rotation detection processing module will output a signal CTR2 to the over-rotation protection logic processing unit, triggering the over-rotation protection logic processing unit's working mode STATE2 to take effect, and at the same time the over-rotation protection logic processing unit will set the working mode STATE1 to be invalid;

[0077] 6) In STATE2 mode, the over-rotation protection logic processing unit adjusts the over-rotation protection threshold value to Np2 and prohibits over-rotation output. At the same time, the over-rotation protection logic processing unit outputs the instruction of connecting the negative control terminal to the over-rotation detection control module, and the over-rotation detection control module outputs the negative power supply voltage to the negative control terminal for t2 seconds;

[0078] 7) If the over-speed detection processing module obtains the potential of the control terminal negative and the power supply negative through potential monitoring within t2 seconds, it indicates that the over-speed protection logic processing unit hardware and the control switch of the control terminal negative have passed the self-test. After the holding time exceeds t2 seconds, the over-speed detection control module will disconnect the power supply negative and the control terminal negative again;

[0079] 8) When an engine stop command is issued, the overspeed detection processing module will collect the potentials of the positive and negative control terminals of the fuel cut-off mechanism control coil. If the potential monitoring indicates that the negative control terminal potential is consistent with the negative power supply potential and the positive control terminal potential is consistent with the positive power supply potential, this moment will be recorded as T0, and the current engine gas generator speed Ng0 will be recorded. After a time of Ts seconds, the gas generator speed Ng1 will be collected again. The overspeed detection processing module will compare the two speed values. If Ng0-Ng1≧DemNg, it is determined that the engine fuel was normally cut off after the fuel cut-off mechanism was activated, and the fuel cut-off mechanism self-test has passed.

[0080] 9) If the engine passes the self-tests in items 4), 7) and 8) above during operation, it means that the over-speed protection self-test has passed, and the electronic controller will record the self-test results.

[0081] Optionally, the self-detection system further includes:

[0082] A fuel flow detection device, used to detect the fuel flow entering the engine fuel nozzle;

[0083] The over-speed detection processing module is further used to control the operation of the fuel flow detection device after the engine stop command is given. If the fuel flow is lower than a preset threshold, it is determined that the fuel cut-off mechanism self-detection has passed.

[0084] Specifically, a fuel flow detection device, such as a fuel flow meter, is provided on the pipeline connecting the fuel cut-off mechanism and the engine fuel nozzle. After the engine stop command is issued, the fuel flow detection device is used to detect the fuel flow entering the engine fuel nozzle in real time. If the fuel flow is lower than a preset threshold, it means that the fuel cut-off mechanism is operating normally, and the fuel cut-off mechanism self-test is determined to have passed. Otherwise, the fuel cut-off mechanism self-test is determined to have failed.

[0085] In addition, another embodiment of the present invention further provides an electronic device, including a processor and a memory, wherein the memory stores a computer program, and the processor is configured to execute the steps of the above method by calling the computer program stored in the memory.

[0086] In addition, another embodiment of the present invention further provides a computer-readable storage medium for storing a computer program for performing self-test of an over-speed protection system. When the computer program is run on a computer, the steps of the method described above are executed.

[0087] Common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tape, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tape, any other physical medium with a pattern of holes, random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), flash-erasable programmable read-only memory (FLASH-EPROM), any other memory chip or cartridge, or any other medium that can be read by a computer. Instructions can further be transmitted or received via a transmission medium. The term transmission medium may include any tangible or intangible medium that can be used to store, encode, or carry instructions for execution by a machine, and includes digital or analog communication signals or other intangible media that facilitate communication of such instructions. Transmission media include coaxial cables, copper wire, and fiber optics, including the wires of a bus used to transmit a computer data signal.

[0088] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiment of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal translation scripting language JavaScript, etc.

[0089] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0092] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0093] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

[0094] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A self-detection method for an over-speed protection system, wherein: The overspeed protection system includes an overspeed protection logic processing unit, a speed acquisition unit, and a fuel cut-off mechanism, and is characterized by the following: After the engine is started normally, the power turbine speed is collected. When the power turbine speed exceeds a first preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the first preset speed and prohibit over-speed output; The control terminal of the control coil of the fuel cut-off mechanism is controlled to be positively connected, and the potential of the control terminal is monitored. If the potential of the control terminal is consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the control terminal self-test have passed, and the control terminal of the control coil of the fuel cut-off mechanism is controlled to be positively disconnected; When the power turbine speed exceeds a second preset speed, the over-speed protection logic processing unit is controlled to adjust the over-speed protection threshold to the second preset speed and prohibit over-speed output, wherein the second preset speed is higher than the first preset speed and lower than the over-speed protection threshold; The negative control terminal of the control coil of the fuel cut-off mechanism is connected, and the potential of the negative control terminal is monitored. If the potential of the negative control terminal remains consistent with the potential of the negative power supply within a preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the negative control terminal self-test have passed, and the negative control terminal of the control coil of the fuel cut-off mechanism is controlled to be disconnected.

2. The self-detection method of the over-rotation protection system according to claim 1, characterized in that: Also included: Give the engine stop command, collect the engine status changes, and judge whether the fuel cut-off mechanism self-detection has passed based on the engine status changes.

3. The self-detection method of the over-rotation protection system according to claim 2, characterized in that: The process of collecting engine status changes and determining whether the fuel cutoff mechanism self-detection has passed based on the engine includes the following: The potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil is monitored. If the potential of the positive control terminal is consistent with the positive potential of the power supply, and the potential of the negative control terminal is consistent with the negative potential of the power supply, this moment is used as the initial moment, and the gas generator speed at the initial moment is collected. The gas generator speed is collected again after a preset time. If the difference between the gas generator speeds at the two moments is greater than or equal to a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed.

4. The self-detection method of the over-rotation protection system according to claim 2, characterized in that: The process of collecting engine status changes and determining whether the fuel cutoff mechanism self-detection has passed based on the engine includes the following: The fuel flow rate entering the engine fuel nozzle is detected. If the fuel flow rate is lower than a preset threshold, it is determined that the fuel cut-off mechanism self-test has passed.

5. A self-detection system for an over-rotation protection system, wherein: The over-speed protection system includes an over-speed protection logic processing unit, a speed acquisition unit and a fuel cut-off mechanism, and is characterized by including: A potential monitoring circuit is used to monitor the potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil; Over-speed detection control module, used to control the on-off of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil; The overspeed detection processing module is configured to, when the power turbine speed exceeds a first preset speed, control the overspeed protection logic processing unit to adjust the overspeed protection threshold to the first preset speed and prohibit overspeed output, and control the overspeed protection logic processing unit to output a command to connect the positive control terminal to the overspeed detection control module. If the potential of the positive control terminal remains consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the positive control terminal of the overspeed protection logic processing unit have passed self-test, and the positive control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected. The module is also configured to, when the power turbine speed exceeds a second preset speed, control the overspeed protection logic processing unit to adjust the overspeed protection threshold to the second preset speed and prohibit overspeed output, and control the overspeed protection logic processing unit to output a command to connect the negative control terminal to the overspeed detection control module. If the potential of the negative control terminal remains consistent with the negative potential of the power supply within a preset time, it is determined that the hardware circuit and the negative control terminal of the overspeed protection logic processing unit have passed self-test, and the negative control terminal of the fuel cutoff mechanism control coil is controlled to be disconnected.

6. The self-detection system of the over-rotation protection system according to claim 5, characterized in that: Also includes: The second speed acquisition circuit is used to acquire the speed of the gas generator; The overspeed detection processing module is further configured to, after an engine stop command is issued, if it is monitored that the positive potential of the control terminal is consistent with the positive potential of the power supply and the negative potential of the control terminal is also consistent with the negative potential of the power supply, then use this moment as the initial moment and control the second speed acquisition circuit to acquire the gas generator speed at the initial moment; after a preset time has passed, control the second speed acquisition circuit to acquire the gas generator speed again; and if the difference between the gas generator speeds at the two moments is greater than or equal to a preset threshold, determine that the fuel cutoff mechanism self-test has passed.

7. The self-detection system of the over-rotation protection system according to claim 5, characterized in that: Also includes: A fuel flow detection device, used to detect the fuel flow entering the engine fuel nozzle; The over-speed detection processing module is further used to control the operation of the fuel flow detection device after the engine stop command is given. If the fuel flow is lower than a preset threshold, it is determined that the fuel cut-off mechanism self-detection has passed.

8. An electronic device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor is configured to execute the steps of the method according to any one of claims 1 to 4 by calling the computer program stored in the memory.

9. A computer-readable storage medium for storing a computer program for performing self-test of an over-speed protection system, characterized in that: When the computer program is run on a computer, the steps of the method according to any one of claims 1 to 4 are executed.

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