Self-detection method and system of over-running protection system, equipment and storage medium

Abstract

The invention discloses a self-detection method and system for an over-rotation protection system, equipment and a storage medium, which adopt the rotating speed of a power turbine as a trigger condition, and can respectively perform self-detection on a hardware circuit and a control switch of an over-rotation logic processing unit of the over-rotation protection system, so as to quickly position a fault when an over-rotation protection function fails, and improve the reliability of the over-rotation protection system. Moreover, the self-detection process of the hardware circuit and the control switch of the overrun logic processing unit does not cause real fuel cut-off, so that an engine driving detection program does not need to be specially researched and developed, dynamic detection can be carried out in an actual installation and use environment, a special ground detection device is not needed, and the detection efficiency is improved. Therefore, the over-rotation protection function can be self-detected in the normal engine test and working process, and it is ensured that the over-rotation protection function is intact in the working process of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of current transformer error checking, and in particular to a self-detection method and system of an over-rotation protection system, an electronic device, 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 will output a control signal to connect the two control ends of the control coil of the fuel cut-off mechanism. After the control coil is energized, the fuel cut-off valve will be closed, thereby cutting off the engine fuel supply. However, there is currently no relevant technology for self-detection of the overspeed protection system, and it is 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 of 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 of an overspeed protection system is provided, wherein the overspeed protection system includes an overspeed protection logic processing unit, a speed acquisition unit and a fuel cut-off mechanism, including 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 threshold value of the over-speed protection to the first preset speed and prohibit the over-speed output;

[0006] The control terminal of the control coil of the fuel cut-off mechanism is controlled to be 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-detection have passed, and the control terminal of the control coil of the fuel cut-off mechanism is controlled to be disconnected;

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

[0008] The negative control terminal of the control coil of the fuel cut-off mechanism is controlled to be connected, and the potential of the negative control terminal is monitored. If the potential of the negative control terminal is 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-detection have passed, and the negative control terminal of the control coil of the fuel cut-off mechanism is controlled to be disconnected.

[0009] Furthermore, the following contents are also included:

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

[0011] Furthermore, the process of collecting the state change of the engine and judging whether the fuel cut-off mechanism self-detection has passed according to the engine includes the following contents:

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

[0013] Furthermore, the process of collecting the state change of the engine and judging whether the fuel cut-off mechanism self-detection has passed according to the engine includes the following contents:

[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-detection 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, used for monitoring the potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil;

[0017] An over-speed detection control module is 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 used to control the overspeed protection logic processing unit to adjust the threshold value of the overspeed protection to the first preset speed and prohibit its overspeed output when the power turbine speed exceeds the first preset speed, and control the overspeed protection logic processing unit to output an instruction to connect the positive control end to the overspeed detection control module. If the potential of the positive control end is consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the control end of the overspeed protection logic processing unit have passed the self-detection, and the control end of the fuel cut-off mechanism control coil is controlled to be disconnected; it is also used to control the overspeed protection logic processing unit to adjust the threshold value of the overspeed protection to the second preset speed and prohibit its overspeed output when the power turbine speed exceeds the second preset speed, and control the overspeed protection logic processing unit to output an instruction to connect the negative control end to the overspeed detection control module. If the potential of the negative control end is consistent with the negative potential of the power supply within a preset time, it is determined that the hardware circuit and the control end of the negative control end of the overspeed protection logic processing unit have passed the self-detection, and the negative control end of the fuel cut-off 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 also used for, after the engine stop command is given, 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 this moment is taken as the initial moment, and the second speed acquisition circuit is controlled to acquire the gas generator speed at the initial moment, and after a preset time, the second speed acquisition circuit is controlled 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, it is determined that the fuel cut-off mechanism self-detection 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 also 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 executes 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 overspeed protection system, wherein the computer program executes the steps of the method described above when running on a computer.

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

[0028] The self-detection method of the over-speed protection system of the present invention adopts the power turbine speed as the trigger condition, and can perform self-detection on the over-speed logic processing unit hardware circuit and the 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, so that 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 purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the 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 It is another flow chart of the self-detection method of the over-rotation protection system of the preferred embodiment of the present application.

[0035] Figure 4 It is a schematic diagram of the module structure of a self-detection system of an 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 in the embodiments of the present 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 The 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, and the self-detection method includes the following contents:

[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 threshold value of the over-speed protection to the first preset speed and prohibit the over-speed output;

[0039] Step S2: Control the control terminal of the fuel cut-off mechanism control coil to be positively connected, and monitor the potential of the control terminal. 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-detection pass, and the control terminal of the fuel cut-off mechanism control coil is controlled to be positively disconnected;

[0040] Step S3: 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 overspeed output, and the second preset speed is higher than the first preset speed and lower than the overspeed protection threshold value;

[0041] Step S4: Control the negative control terminal of the fuel cut-off mechanism control coil to be connected, and monitor the potential of the negative control terminal. If the potential of the negative control terminal is 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-detection have passed, and the negative control terminal of the fuel cut-off mechanism control coil is controlled to be disconnected.

[0042] It can be understood that the self-detection method of the over-speed protection system of this embodiment collects the power turbine speed after the engine is started normally. If the power turbine speed exceeds the first preset speed, the over-speed protection logic processing unit is controlled to adjust the threshold value of the over-speed protection to the first preset speed and prohibit its over-speed output. At this time, the over-speed protection logic processing unit no longer outputs a control signal to directly control the control end of the fuel cut-off mechanism control coil to be connected, but controls the control end of the fuel cut-off mechanism control coil to be connected through other control modules, and then monitors the potential of the control end. If the potential of the control end is consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the control end of the over-speed protection logic processing unit have passed the self-detection. When the speed of the power turbine exceeds the second preset speed, the over-speed protection logic processing unit is controlled to adjust the threshold value of the over-speed protection to the second preset speed and prohibit its over-speed output. At this time, the over-speed protection logic processing unit no longer outputs a control signal to directly control the control end negative connection of the fuel cut-off mechanism control coil, but controls the control end negative connection of the fuel cut-off mechanism control coil through other control modules, and then monitors the potential of the control end negative. If the potential of the control end negative is consistent with the potential of the power supply negative within the preset time, it is determined that the hardware circuit of the over-speed protection logic processing unit and the control end negative self-detection have passed. The self-detection method of the over-speed protection system of the present invention adopts the power turbine speed as the trigger condition, and can perform self-detection on the over-speed logic processing unit hardware circuit and the 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, so that 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 collection 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 threshold value of the over-speed protection 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 the 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 a real 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 command, 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 command in the over-speed protection logic processing unit is working normally, thereby judging that the self-detection of the control end hardware control circuit of the over-speed protection logic processing unit and the control switch of the control end has passed, otherwise it is judged that the self-detection 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 over-speed protection threshold value > Np2 > Np1, the over-speed protection logic processing unit is controlled to temporarily adjust the threshold value of the over-speed protection to the second preset speed Np2 and prohibit its over-speed output. At this time, although the power turbine speed is greater than the temporary threshold value of the 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 a real fuel cut-off, and the over-speed protection logic processing unit will output an instruction to connect the control terminal negative to other control modules.

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

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

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

[0049] Specifically, after the engine electronic controller gives an 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 action of the fuel cut-off mechanism. By monitoring the state changes of the engine, it is possible to determine 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 actuated.

[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 starting process, a complete over-speed protection function self-detection can be completed during each engine starting and stopping process, and the fault can be quickly located when the over-speed protection function fails without human intervention.

[0051] The process of collecting the state change of the engine and judging whether the fuel cut-off mechanism self-detection has passed according to the engine includes the following contents:

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

[0053] Specifically, when the engine stop command is given, the potentials of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil are collected. If the positive control terminal potential is consistent with the positive power supply potential, and the negative control terminal potential is also consistent with the negative power supply potential, it means that the control switches of the positive control terminal and the negative control terminal are normally connected, that is, the fuel cut-off mechanism is operating normally. This moment is taken as the initial moment T0, and the gas generator speed Ng0 at the moment T0 is collected. After the preset time Ts seconds, the gas generator speed Ng1 is collected again. If Ng0-Ng1≥DNg, DNg represents the preset speed drop threshold, it can be determined that the engine fuel is normally cut off after the fuel cut-off mechanism is actuated, that is, it is determined that the fuel cut-off mechanism self-detection has passed, otherwise it is determined that the fuel cut-off mechanism self-detection has failed.

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

[0055] Optionally, in another embodiment of the present invention, the process of collecting the state change of the engine and judging whether the fuel cut-off mechanism self-detection has passed according to the engine includes the following contents:

[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-detection 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 operates normally, and the fuel cut-off mechanism self-detection is determined to have passed. Otherwise, the fuel cut-off mechanism self-detection is determined to have failed.

[0058] It can be understood that the present invention monitors the fuel flow entering the engine fuel nozzle. If the fuel flow is lower than the preset threshold after the engine stop command is issued, the fuel cut-off mechanism self-test is determined to have passed, and the fuel cut-off mechanism self-test can be intuitively and conveniently implemented. In addition, due to the large size and weight of the fuel flow meter, the fuel flow meter is usually not installed on the fuel supply pipeline of the engine's fuel nozzle to avoid increasing the weight of the engine and preventing the engine from vibrating beyond the limit. Therefore, it is usually necessary to use the fuel flow meter of the ground test bench to monitor the fuel flow entering the engine fuel nozzle, that is, it is generally necessary to perform the self-test of the fuel cut-off mechanism during the ground test, and it is impossible to perform the self-test of the fuel cut-off mechanism in the actual installation and use 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 as 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 the system includes:

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

[0061] An over-speed detection control module is 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 used to control the overspeed protection logic processing unit to adjust the threshold value of the overspeed protection to the first preset speed and prohibit its overspeed output when the power turbine speed exceeds the first preset speed, and control the overspeed protection logic processing unit to output an instruction to connect the positive control end to the overspeed detection control module. If the potential of the positive control end is consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the control end of the overspeed protection logic processing unit have passed the self-detection, and the control end of the fuel cut-off mechanism control coil is controlled to be disconnected; it is also used to control the overspeed protection logic processing unit to adjust the threshold value of the overspeed protection to the second preset speed and prohibit its overspeed output when the power turbine speed exceeds the second preset speed, and control the overspeed protection logic processing unit to output an instruction to connect the negative control end to the overspeed detection control module. If the potential of the negative control end is consistent with the negative potential of the power supply within a preset time, it is determined that the hardware circuit and the control end of the negative control end of the overspeed protection logic processing unit have passed the self-detection, and the negative control end of the fuel cut-off 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 the present embodiment adopts the power turbine speed as the trigger condition, and can perform self-detection on the over-speed logic processing unit hardware circuit and the control switch of the over-speed protection system respectively, so as to facilitate rapid fault location when the over-speed protection function fails, and the self-detection process of the over-speed logic processing unit hardware circuit and the control switch will not lead to 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, so that 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 in the over-speed protection system is the speed acquisition unit of the over-speed protection system. Of course, in other embodiments of the present invention, a speed acquisition circuit can also be set separately to collect the power turbine speed in real time. In addition, the potential monitoring circuit belongs to the existing circuit, and its specific circuit principle is not repeated here. In addition, 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 also used for, after the engine stop command is given, 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 this moment is taken as the initial moment, and the second speed acquisition circuit is controlled to acquire the gas generator speed at the initial moment, and after a preset time, the second speed acquisition circuit is controlled 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, it is determined that the fuel cut-off mechanism self-detection has passed.

[0068] Specifically, when the engine stop command is given, the potential monitoring circuit collects the potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil. 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, it means that the control switches of the positive control terminal and the negative control terminal are normally connected, that is, the fuel cut-off mechanism operates normally. This moment is taken as the initial moment T0, and the overspeed detection processing module controls the second speed acquisition circuit to collect the gas generator speed Ng0 at the moment T0. After the preset time Ts seconds, the second speed acquisition circuit is controlled again to collect the gas generator speed Ng1. If Ng0-Ng1≥DemNg, DemNg represents the preset speed drop threshold, then the overspeed detection processing module can determine that the engine fuel is normally cut off after the fuel cut-off mechanism is actuated, that is, it is determined that the fuel cut-off mechanism self-detection has passed, otherwise it is determined that the fuel cut-off mechanism self-detection has not passed.

[0069] It can be understood that the present invention adopts the engine stop command as the trigger condition. After the stop command is triggered, the gas generator speed is collected through the second speed collection circuit, so as to monitor the decrease in the gas generator speed. If the decrease in the gas generator speed is greater than or equal to the preset threshold, it is determined that the fuel cut-off mechanism self-detection has passed, otherwise it is determined that the fuel cut-off mechanism self-detection has not passed. The fuel cut-off mechanism can be self-detected in the actual installation and use 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 effectiveness of the STATE1 and SRTATE2 working modes of the over-speed protection logic processing unit. 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, and the over-speed protection speed will be automatically reset to Np1 and Np2. When the overspeed detection is on, 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 control positive and negative terminals of the fuel cut-off mechanism according to the command. In this way, the overspeed protection logic processing unit and the control switch function normally in each engine working cycle can be detected without performing a protection shutdown test. In addition, the overspeed detection processing module will also collect the speed of the gas generator of the engine 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:

[0072] 1) The engine starts normally, and the engine electronic controller outputs a 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 working mode STATE1 of the over-speed protection logic processing unit 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 positive voltage of the power supply to the control terminal, and lasts 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-detection. 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 inside 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 working mode STATE2 of the over-rotation protection logic processing unit 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 threshold value of the over-rotation protection 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, and lasts for t2 seconds;

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

[0079] 8) When the engine stop command is given, 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 shows that the negative potential of the control terminal is consistent with the negative potential of the power supply and the positive potential of the control terminal is consistent with the positive potential of the power supply, this moment will be recorded as T0, and the current engine gas generator speed Ng0 will be recorded. After 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 is normally cut off after the fuel cut-off mechanism is actuated, and the fuel cut-off mechanism self-detection passes.

[0080] 9) If the self-tests in items 4), 7) and 8) above are all passed during the operation of the engine, it indicates 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 also 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 operates normally, and the fuel cut-off mechanism self-detection is determined to have passed. Otherwise, the fuel cut-off mechanism self-detection 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 executes 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-detection of an overspeed protection system, wherein the computer program executes the steps of the method described above when running on a computer.

[0087] The general form of computer readable storage media includes: floppy disk, flexible disk, hard disk, magnetic tape, any other magnetic medium, CD-ROM, any other optical medium, 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. The instructions can further be transmitted or received by a transmission medium. The term transmission medium can 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 the communication of the above instructions. Transmission media include coaxial cables, copper wires and optical fibers, which include 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 present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present 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 embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal 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 generate 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 capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A 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 operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0092] Although the preferred embodiments of the present application have been described, those skilled in the art may make other 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 falling within the scope of the present application.

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

[0094] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 in that it includes the following contents: 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 threshold value of the over-speed protection to the first preset speed and prohibit the over-speed output; The control terminal of the control coil of the fuel cut-off mechanism is controlled to be 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-detection have passed, and the control terminal of the control coil of the fuel cut-off mechanism is controlled to be disconnected; When the power turbine speed exceeds a second preset speed, the over-speed protection logic processing unit is controlled to adjust the threshold value of the over-speed protection to the second preset speed and prohibit the over-speed output, and the second preset speed is higher than the first preset speed and lower than the threshold value of the over-speed protection; The negative control terminal of the control coil of the fuel cut-off mechanism is controlled to be connected, and the potential of the negative control terminal is monitored. If the potential of the negative control terminal is 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-detection 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 are the following: Give an engine stop command, collect engine status changes, and determine 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 the state change of the engine and judging whether the fuel cut-off mechanism self-detection has passed according to the engine includes the following contents: The potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil is monitored. If it is monitored that 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 taken as the initial moment, and the gas generator speed at the initial moment is collected. After a preset time, the gas generator speed is collected again. If the difference between the gas generator speeds at the two moments is greater than or equal to the preset threshold, it is determined that the fuel cut-off mechanism self-detection has passed.

4. The self-detection method of the over-rotation protection system according to claim 2, characterized in that: The process of collecting the state change of the engine and judging whether the fuel cut-off mechanism self-detection has passed according to the engine includes the following contents: 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-detection 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 in that it includes: A potential monitoring circuit, used for monitoring the potential of the positive control terminal and the negative control terminal of the fuel cut-off mechanism control coil; An over-speed detection control module is 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 used to control the overspeed protection logic processing unit to adjust the threshold value of the overspeed protection to the first preset speed and prohibit its overspeed output when the power turbine speed exceeds the first preset speed, and control the overspeed protection logic processing unit to output an instruction to connect the positive control end to the overspeed detection control module. If the potential of the positive control end is consistent with the positive potential of the power supply within a preset time, it is determined that the hardware circuit and the control end of the overspeed protection logic processing unit have passed the self-detection, and the control end of the fuel cut-off mechanism control coil is controlled to be disconnected; it is also used to control the overspeed protection logic processing unit to adjust the threshold value of the overspeed protection to the second preset speed and prohibit its overspeed output when the power turbine speed exceeds the second preset speed, and control the overspeed protection logic processing unit to output an instruction to connect the negative control end to the overspeed detection control module. If the potential of the negative control end is consistent with the negative potential of the power supply within a preset time, it is determined that the hardware circuit and the negative control end of the overspeed protection logic processing unit have passed the self-detection, and the negative control end of the fuel cut-off 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 also used for, after the engine stop command is given, 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 this moment is taken as the initial moment, and the second speed acquisition circuit is controlled to acquire the gas generator speed at the initial moment, and after a preset time, the second speed acquisition circuit is controlled 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, it is determined that the fuel cut-off mechanism self-detection 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 also 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 used 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 overspeed 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.

Images