Method for controlling and monitoring operation of aircraft engine oil seal retracting and opening device

Abstract

The invention belongs to the field of aircraft engine oil seal opening and closing, and provides an aircraft engine oil seal opening and closing device operation control monitoring method which comprises the steps that an external draught fan is used for extracting an oil mist mixture in tail spraying, oil mist is filtered through multiple layers of filter screens, oil mist separation is achieved, two control modes of automatic control and manual control are adopted, and the oil seal opening and closing device can be controlled and monitored. In the manual control mode, the operation frequency of the fan is manually adjusted to control the rotating speed of the fan, and in the automatic control mode, setting is carried out through a human-computer interaction interface, the PLC drives the frequency converter to control the air entraining power of the fan, and function expansion is carried out through PLC programming; according to the oil seal oil collecting device, the draught fan is additionally arranged to extract an oil mist mixture in tail spraying, the multiple layers of filter screens are used for filtering oil mist, more efficient oil-gas separation is achieved, pollution of the oil mist to an airplane and the environment is reduced through the design, the overall performance of the oil seal oil collecting device is improved, and it is ensured that the quality of exhausted gas meets the environmental protection standard.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine oil seal retraction and opening, in particular to an operation control and monitoring method of an aircraft engine oil seal retraction and opening device. Background Art

[0002] With the rapid development of the aviation industry, the maintenance and operating efficiency of aircraft engines have become important research topics in the aviation field. In the daily operation and maintenance of aircraft engines, oil seals and oil collection devices play a vital role. Traditional oil seals and oil collection devices often fail to achieve efficient oil-gas separation when dealing with the oil mist mixture in the tail spray, resulting in the failure to effectively remove the fine particles in the oil mist, which not only affects the performance of the aircraft, but may also cause pollution to the environment. Due to the poor oil-gas separation effect, the exhaust gas may not meet the increasingly stringent environmental protection standards, which not only poses a potential threat to the environment, but also increases the difficulty and cost of aircraft maintenance. At the same time, incomplete oil-gas separation and substandard emissions may cause oil mist to accumulate inside the aircraft, increasing the risk of fire and explosion, and posing a threat to the safe operation of the aircraft.

[0003] Therefore, those skilled in the art have proposed a method for controlling and monitoring the operation of an aircraft engine oil seal device to solve the problems raised by the background art. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an operation control and monitoring method for an aircraft engine oil seal retracting and opening device to solve the problems existing in the prior art.

[0005] A method for controlling and monitoring the operation of an aircraft engine oil seal device comprises the following steps: S1. extracting an oil mist mixture in a tail spray by using an external fan, and filtering the oil mist through a multi-layer filter screen to achieve oil mist separation;

[0006] S2. Two control modes are adopted: automatic control and manual control;

[0007] S3. In manual control mode, manually adjust the fan operating frequency to control the fan speed;

[0008] S4. In the automatic control mode, the settings are made through the human-machine interface, and the PLC controller drives the inverter to control the fan air intake power;

[0009] S5. Function expansion through PLC programming;

[0010] S6. The overall design of the control system uses PLC as a controller to control the frequency converter to achieve speed control of the variable frequency fan;

[0011] S7. The pressure value in the acquisition device is collected through the analog acquisition module connected to the PLC, and the measured pressure value of the device is displayed on the touch screen;

[0012] S8. Use PID to automatically control the fan speed;

[0013] S9.HM I touch screen program design, including system login interface, main interface, manual control interface, automatic control interface, setting interface and test interface;

[0014] S10. The program records the duration of each fan operation and displays the total duration of the fan operation by accumulation. When the total duration of the fan operation reaches a preset value, a system maintenance prompt warning is issued.

[0015] Preferably, in the step of filtering the oil mist mixture in the tail spray by the wind force of the external fan through a multi-layer filter, the multi-layer filter includes at least two layers of filter with different pore sizes.

[0016] Preferably, in the manual control mode, the adjustment range of the fan operating frequency is 0-50 Hz, and the adjustment step is 1 Hz.

[0017] Preferably, the PID control algorithm formula is: Where u(t) is the control quantity, e(t) is the deviation, K p , K i , K d are the proportional, integral and differential control coefficients respectively.

[0018] Preferably, the PLC controller performs PID control according to the set pressure value and the real-time measured pressure value to automatically adjust the fan speed, wherein the proportional control coefficient K in the PID control algorithm is p , integral control coefficient K i , differential control coefficient K d The value ranges are K p ∈[0.1,10],K i ∈[0.01,1], K d ∈[0.01,1].

[0019] Preferably, the communication between the PLC controller and the frequency converter adopts the Modbus protocol, and the communication frequency is fHz.

[0020] Preferably, the pressure value collected by the analog acquisition module is converted into a current signal, the current signal range is 4-20mA, and the conversion formula is Where I is the output current, P is the collected pressure value, P min and P max are the minimum and maximum pressure values, I minand I max are the minimum and maximum values ​​of the current respectively.

[0021] Preferably, in the PID control algorithm, the proportional control coefficient K p , integral control coefficient K i , differential control coefficient K d It can be adjusted according to the actual operation conditions to optimize the control effect, and the adjustment formula is: Where τ is the time constant of the system.

[0022] Preferably, in the HMI touch screen programming, the system login interface includes a password input and a login button, as well as a password error prompt, and when the password is entered incorrectly more than 3 times, the system is automatically locked for 5 minutes, the automatic control interface includes model selection, operating time display, system start and stop buttons, and the system start button will perform a self-check at startup, and the self-check process includes a fan status check, a power status check, and a sensor status check.

[0023] Preferably, in the step of recording the running time of the fan in the program, when the total running time of the fan reaches 25 minutes, the system pops up a maintenance reminder, and when the total running time of the fan reaches 30 minutes, the system pops up a timeout alarm.

[0024] Through the above technical solution,

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention extracts the oil mist mixture in the tail spray through an external fan and filters the oil mist using a multi-layer filter screen, thereby achieving more efficient oil and gas separation. This design not only reduces the pollution of oil mist to the aircraft and the environment, but also improves the overall performance of the oil seal and oil collection device, ensuring that the quality of the exhaust gas meets environmental protection standards.

[0027] 2. The present invention provides two modes: automatic control and manual control, so that operators can flexibly choose the control mode according to actual needs. In the automatic control mode, the fan speed is automatically adjusted through the precise control of the PLC controller and the frequency converter, and the application of the PID control algorithm, which improves the reliability and stability of the system. In the manual control mode, the operator can manually adjust the fan operating frequency according to the task requirements, which increases the flexibility of the system.

[0028] 3. The present invention fully considers the concept of energy conservation and environmental protection in its design. By optimizing the control system and improving the oil-gas separation efficiency, it reduces energy consumption and environmental pollution. At the same time, the program records the running time of the fan and issues a system maintenance warning when the preset value is reached, which helps to perform equipment maintenance in a timely manner, prolong the service life of the equipment, reduce resource waste, and meet the requirements of modern aviation industry for energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a flowchart of the method of the present invention;

[0030] Figure 2 This is the overall design block diagram of the control system in the present invention; DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] Embodiment 1: As shown in the attached Figure 1 To Attachment Figure 2 As shown: The present invention provides an operation control and monitoring method for an aircraft engine oil seal device, comprising the following steps:

[0033] S1. Use an external fan to extract the oil mist mixture in the tail spray, and filter the oil mist through a multi-layer filter screen to achieve oil mist separation, wherein the multi-layer filter screen includes at least two layers of filter screens with different pore sizes to improve the oil mist separation efficiency, the pore size of the first layer of filter screen is 0.5 microns, and the pore size of the second layer of filter screen is 0.1 microns, ensuring that fine particles in the oil mist are effectively removed, reducing pollution to the aircraft and the environment;

[0034] S2. Two control modes, automatic control and manual control, are adopted to adapt to different operation requirements and environmental conditions, thus improving the flexibility and practicality of the system;

[0035] S3. In manual control mode, the operator can manually adjust the fan operating frequency according to task requirements to achieve control of the fan speed. The adjustment range is 0-50Hz, and the adjustment step is 1Hz, making the operation more precise to adapt to different working conditions;

[0036] S4. In the automatic control mode, the setting is performed through the human-machine interface, and the PLC controller drives the frequency converter to control the fan air intake power. In the automatic control mode, the setting is performed through the human-machine interface, and the PLC controller drives the frequency converter to control the fan air intake power. The function can also be expanded through PLC programming to adapt to different operating requirements and environmental conditions;

[0037] S5. Function expansion through PLC programming;

[0038] S6. The overall design of the control system uses PLC as a controller to control the frequency converter to achieve speed control of the variable frequency fan;

[0039] S7. The pressure value in the acquisition device is collected through the analog acquisition module connected to the PLC, and the measured pressure value of the device is displayed on the touch screen;

[0040] S8. PID is used to automatically control the fan speed. The overall design of the control system uses PLC as a controller to control the frequency converter to achieve speed control of the variable frequency fan. At the same time, the pressure value in the device is collected through the analog acquisition module connected to the PLC, and the actual pressure value of the device is displayed on the touch screen. When the automatic control mode is adopted, the pressure value set by human-computer interaction is compared with the actual pressure value collected in real time to achieve PID automatic control of the fan speed. Through precise proportional differential integral control, the fan speed is accurately adjusted, which improves the stability and response speed of the system;

[0041] S9.HMI touch screen programming, including system login interface, main interface, manual control interface, automatic control interface, setting interface and test interface. HMI touch screen programming, including system login interface, main interface, manual control interface, automatic control interface, setting interface and test interface, provides an intuitive user interaction interface, allowing operators to easily perform various operations and settings, improving user experience and convenience of operation;

[0042] S10. The program records the duration of each fan operation and displays the total duration of the fan operation by accumulation. When the total duration of the fan operation reaches the preset value, a system maintenance prompt warning is issued. The program records the duration of each fan operation and displays the total duration of the fan operation by accumulation. The system detects the total duration of the fan operation each time it is turned on. When the total duration of the fan operation is greater than or equal to 25 minutes and less than 30 minutes, the HM I screen pops up a prompt with the prompt content that the remaining time for system maintenance is less than 5 minutes. When the total duration of the fan operation is greater than or equal to 30 minutes, the HM I screen pops up an alarm with the alarm content that the system operation has timed out and maintenance is required. These intelligent prompts and alarms ensure timely maintenance and safe operation of the equipment.

[0043] Furthermore, in the step of filtering the oil mist mixture in the tail spray by the wind force of the external fan through a multi-layer filter, the multi-layer filter includes at least two layers of filter with different pore sizes.

[0044] Preferably, in the manual control mode, the adjustment range of the fan operating frequency is 0-50 Hz, and the adjustment step is 1 Hz.

[0045] Specifically, the overall design of the control system is to use PLC as a controller to control the frequency converter to achieve speed control of the variable frequency fan. At the same time, the pressure value in the device is collected through the analog acquisition module connected to the PLC, and the actual pressure value of the device is displayed on the touch screen. When the automatic control mode is adopted, the pressure value set by human-computer interaction is compared with the actual pressure value collected in real time to realize PID automatic control of the fan speed. The control system equipment connection diagram: the device uses 380V AC as the main power supply, and converts the power supply into 220V AC through frequency conversion technology, and supplies power to 7.5KW variable frequency fan, frequency converter, distribution box fan and other equipment through relays and protectors; 24V DC power is provided to PLC controller, analog acquisition module, HM I display screen, etc. through rectification technology.

[0046] Embodiment 2: As shown in the attached Figure 1 To Attachment Figure 2 As shown: This embodiment is basically the same as the previous embodiment, except that the PID control algorithm formula is: Where u(t) is the control quantity, e(t) is the deviation, K p , K i , K d are the proportional, integral and differential control coefficients respectively.

[0047] Preferably, the PLC controller performs PID control according to the set pressure value and the real-time measured pressure value to automatically adjust the fan speed, wherein the proportional control coefficient K in the PID control algorithm is p , integral control coefficient K i , differential control coefficient K d The value ranges are K p ∈[0.1,10],K i ∈[0.01,1], K d ∈[0.01,1], the communication between the PLC controller and the frequency converter adopts the Modbus protocol, and the communication frequency is fHz.

[0048] Specifically, the pressure value collected by the analog acquisition module is converted into a current signal, the current signal range is 4-20mA, and the conversion formula is Where I is the output current, P is the collected pressure value, P min and P max are the minimum and maximum pressure values, I min and I max are the minimum and maximum values ​​of the current respectively.

[0049] Furthermore, in the PID control algorithm, the proportional control coefficient K p , integral control coefficient K i , differential control coefficient Kd It can be adjusted according to the actual operation conditions to optimize the control effect, and the adjustment formula is: Where τ is the time constant of the system.

[0050] Preferably, the PLC program reads the frequency program block: the frequency of the variable frequency fan is read by calling the MBUS_MSG instruction, the read frequency is converted into a numerical value, and the real-time frequency value is displayed at the address connected by the touch screen. The PLC pressure value program block: the collected data is converted into current by calling the S_I TR instruction. The 5530-27648 range corresponds to the 4-20ma current range. The maximum and minimum pressure ranges can be set through OSH and OSL, thereby realizing the control range of the output pressure engineering value.

[0051] Specifically, the PID program block: realizes PID control of the set pressure value by calling the S_I TR and PIDO_CTRL instructions, performs proportional differential integral control, adjusts the pressure toward the set pressure value, and then converts the real-time adjusted pressure value into a frequency output to the frequency converter through the connection with the frequency converter to realize automatic control of the fan speed.

[0052] Embodiment 3: As shown in the attached Figure 1 To Attachment Figure 2 As shown in the figure: Based on the first embodiment, in the HMI touch screen program design, the system login interface includes a password input and a login button, as well as a password error prompt, and when the password is entered incorrectly more than 3 times, the system is automatically locked for 5 minutes, and the automatic control interface includes model selection, operating time display, system start and stop buttons, and the system start button will perform a self-check at startup, and the self-check process includes a fan status check, a power status check, and a sensor status check.

[0053] Preferably, in the step of recording the running time of the fan in the program, when the total running time of the fan reaches 25 minutes, the system pops up a maintenance reminder, and when the total running time of the fan reaches 30 minutes, the system pops up a timeout alarm.

[0054] From the above, we can see that the HM I system login interface: enter the password to enter the system main interface (setting the login password is mainly to protect information security and prevent personnel from misoperation. Press the reset button to reset the entered password. After entering the password, press the login button to log in. If the password is entered incorrectly, the password error message will pop up. Please re-enter the password! Click the confirmation button to return to the password input interface).

[0055] HM I main interface: Enter the correct password and press the login button to enter the main interface of the engine start (oil) seal and oil collection system. The main interface is mainly used to select and enter each subsystem interface. The subsystem interface includes manual control interface, automatic control interface, test interface, and setting interface. (Enter the corresponding interface by pressing the corresponding button).

[0056] HM I manual control interface: Enter the manual control interface by pressing the manual control button on the main interface. The interface includes: current time display; system operation status display light; system start and stop buttons; running time display (running time is the time for recording the fan operation this time, when the start button is pressed, the timing starts, and when the stop button is pressed, the timing stops); frequency display, pressure measured value (previously designed pressure display value); fan rotation animation (the fan rotates when the fan starts, and the fan does not rotate when the fan stops), the speed is the current fan speed (the speed is related to the frequency, 0-100% speed corresponds to 0-50HZ frequency): return button (enter the system main interface by pressing the return button).

[0057] HM I model selection interface: Enter the model selection interface by pressing the automatic control button on the main interface. The interface includes: model selection (including multiple model selection buttons, setting the corresponding pressure value in the HM I setting interface (the set pressure value has a storage memory function), reading the pressure value set for the corresponding model by pressing the corresponding button, and entering the automatic control interface at the same time); current time display; return button (enter the system main interface by pressing the return button).

[0058] HM I automatic control interface: Enter the automatic control interface by pressing the model button on the model selection interface. The interface includes: current time display; running time display (running time is the time for recording the fan running this time, when the start button is pressed, the timing starts, and when the stop button is pressed, the timing stops); system operation status display light; system start (press the start button to determine the pressure value. When the pressure sensor measures relative pressure: when the pressure value is less than or equal to 0, the fan speed reaches 15HZ idle state, and the pressure value reaches the minimum range to achieve automatic control; when the pressure sensor measures absolute pressure: when the pressure value is less than or equal to the standard air pressure, the fan speed reaches 15HZ idle state, and the pressure value reaches the minimum range to achieve automatic control.), stop button; frequency display, pressure measured value (previously designed pressure display value); fan rotation animation (the fan rotates when the fan starts, and the fan does not rotate when the fan stops), the speed is the current fan speed (the speed is related to the frequency, 0-100% speed corresponds to 0-50HZ frequency); return button (enter the system main interface by pressing the return button).

[0059] HM I setting interface: Enter the setting interface by pressing the setting button on the main interface. The interface includes: pressure value setting (including pressure value setting for various models, setting the pressure value on this interface, and the set pressure value has a storage memory function); maximum pressure range, minimum pressure range; modifying system time; setting the system startup password; total running time (accumulating the total running time of the fan by adding up the time of each fan running) return button (enter the system main interface by pressing the return button).

[0060] HM I test interface: Enter the test interface by pressing the test button on the main interface. The interface includes: current time display; return button (enter the system main interface by pressing the return button); system test button, emergency stop button (press the start button to test, press the emergency stop button to stop the test); the system test is mainly used to test the operating performance of the fan (the test process is that when the test button is pressed, the fan starts to run and the frequency increases from 0 to 50, and then decreases from 50 to 0. The test duration is 30S. At the same time, the speed displays the current speed of the fan. The speed is related to the frequency, and 0-100% speed corresponds to 0-50HZ frequency).

[0061] Procedure: The program records the duration of each fan operation and calculates the total fan operation duration. The total fan operation duration is detected each time the system is started. When the total fan operation duration is greater than or equal to 25 minutes and less than 30 minutes, the HM I screen pops up a prompt (the prompt content is that the remaining time for system maintenance is less than 5 minutes!), and the personnel presses the Cancel button to enter the HM I system login interface and operate the system normally; when the total fan operation duration is greater than or equal to 30 minutes, the HM I screen pops up an alarm (the alarm content is that the system operation has timed out, please perform maintenance and repair), and when the system is maintained and repaired by the personnel, press the System Maintained button (after pressing the System Maintained button, the total system operation time is reset and the timing starts again), enter the HM I system login interface, and operate the system normally.

[0062] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0064] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling and monitoring the operation of an aircraft engine oil seal device, characterized in that: The following steps are involved: S1. Use an external fan to extract the oil mist mixture in the tail spray, and filter the oil mist through a multi-layer filter to achieve oil mist separation; S2. Two control modes are adopted: automatic control and manual control; S3. In manual control mode, manually adjust the fan operating frequency to control the fan speed; S4. In the automatic control mode, the settings are made through the human-machine interface, and the PLC controller drives the inverter to control the fan air intake power; S5. Function expansion through PLC programming; S6. The overall design of the control system uses PLC as a controller to control the frequency converter to achieve speed control of the variable frequency fan; S7. The pressure value in the acquisition device is collected through the analog acquisition module connected to the PLC, and the measured pressure value of the device is displayed on the touch screen; S8. Use PID to automatically control the fan speed; S9.HMI touch screen programming, including system login interface, main interface, manual control interface, automatic control interface, setting interface and test interface; S10. The program records the duration of each fan operation and displays the total duration of the fan operation by accumulation. When the total duration of the fan operation reaches a preset value, a system maintenance prompt warning is issued.

2. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device according to claim 1, characterized in that: The wind force of the external fan extracts the oil mist mixture in the tail spray, and in the step of filtering through a multi-layer filter, the multi-layer filter includes at least two layers of filter with different apertures.

3. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 2, characterized in that: In the manual control mode, the adjustment range of the fan operating frequency is 0-50 Hz, and the adjustment step is 1 Hz.

4. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 3, characterized in that: The PID control algorithm formula is: Where u(t) is the control quantity, e(t) is the deviation, K p , K i , K d are the proportional, integral and differential control coefficients respectively.

5. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 4, characterized in that: The PLC controller performs PID control according to the set pressure value and the real-time measured pressure value to automatically adjust the fan speed, wherein the proportional control coefficient K in the PID control algorithm is p , integral control coefficient K i , differential control coefficient K d The value ranges are K p ∈[0.1,10],K i ∈[0.01,1], K d ∈[0.01,1].

6. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 5, characterized in that: The communication between the PLC controller and the frequency converter adopts the Modbus protocol, and the communication frequency is fHz.

7. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 6, characterized in that: The pressure value collected by the analog acquisition module is converted into a current signal, the current signal range is 4-20mA, and the conversion formula is Where I is the output current, P is the collected pressure value, P min and P max are the minimum and maximum pressure values, I min and I max are the minimum and maximum values ​​of the current respectively.

8. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 7, characterized in that: In the PID control algorithm, the proportional control coefficient K p , integral control coefficient K i , differential control coefficient K d It can be adjusted according to the actual operation conditions to optimize the control effect, and the adjustment formula is: Where τ is the time constant of the system.

9. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 8, characterized in that: In the HMI touch screen program design, the system login interface includes password input and login button, as well as password error prompt, and when the password is entered incorrectly more than 3 times, the system is automatically locked for 5 minutes, the automatic control interface includes model selection, operation time display, system start and stop buttons, and the system start button will perform self-check at startup, and the self-check process includes fan status check, power status check and sensor status check.

10. The method for controlling and monitoring the operation of an aircraft engine oil seal retracting and opening device as claimed in claim 9, characterized in that: In the step of recording the fan operation time of the program, when the total operation time of the fan reaches 25 minutes, the system pops up a maintenance reminder, and when the total operation time of the fan reaches 30 minutes, the system pops up a timeout alarm.

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