CN112696272A - Aeroengine rotational speed monitoring limiting circuit - Google Patents
Aeroengine rotational speed monitoring limiting circuit Download PDFInfo
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- CN112696272A CN112696272A CN202011520807.XA CN202011520807A CN112696272A CN 112696272 A CN112696272 A CN 112696272A CN 202011520807 A CN202011520807 A CN 202011520807A CN 112696272 A CN112696272 A CN 112696272A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
- F02C9/26—Control of fuel supply
- F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention provides an aircraft engine rotating speed monitoring limiting circuit, which comprises a first detection channel and a second detection channel, wherein the first detection channel and the second detection channel both comprise a rotating speed signal conditioning circuit and a signal judging and controlling circuit; the rotating speed signal conditioning circuit is used for filtering and amplifying the rotating speed signal, and outputting the rotating speed signal to the signal judging and controlling circuit after square wave conversion and amplitude detection; the signal judging and controlling circuit is used for counting the rotating speed frequency signals, comparing the rotating speed frequency signals at a set frequency, and outputting an overspeed control signal when a measured value is greater than a set value; when the first detection channel and the second detection channel both output overspeed control signals to an overspeed relay of the engine, the overspeed relay is driven to cut off a fuel supply loop of the engine. The invention can effectively monitor the rotating speed of the engine, can avoid the output of a parking command by a deficiency-type alarm caused by internal faults of products, and protects the engine from being damaged.
Description
Technical Field
The disclosure relates to the technical field of aircraft engines, in particular to an aircraft engine rotating speed monitoring limiting circuit.
Background
Among the mechanical structural limitations of the gas turbine engine, the maximum allowable rotating speed of a rotor is limited, the aircraft engine overruns lightly to damage the physical structure of the engine (such as blade fracture) and seriously to endanger the flight safety of the aircraft, so the overruns protection is one of the most critical guarantee systems in the engine control system. The over-rotation can lead to the direct stopping of the engine and cause flight accidents, so that a monitoring and limiting method for the rotating speed of the aero-engine needs to be designed, the rotating speed of the engine can be effectively monitored, and the situation that the defect-type alarm outputs a stopping command due to the internal faults of a product can be avoided.
Disclosure of Invention
In view of this, the embodiment of the present disclosure provides an aircraft engine rotation speed monitoring limiting circuit, which aims to collect signals of one path of engine rotation speed sensor and then apply dual redundancy to process rotation speed, and when two paths of processing circuits both output a parking command, a product outputs a parking instruction to park an engine, so that the engine can be effectively monitored in rotation speed, a deficiency-type alarm caused by internal faults of the product can be avoided to output a parking command, and the engine is protected from being damaged.
In order to achieve the purpose, the invention provides the following technical scheme:
a kind of aeroengine rotational speed monitors the limiting circuit, including the first detection channel and second detection channel connected with engine overspeed relay separately, said first detection channel and second detection channel include rotational speed signal conditioning circuit and signal differentiate and control circuit;
the rotating speed signal conditioning circuit is used for filtering and amplifying a rotating speed signal, and outputting the rotating speed signal to the signal judging and controlling circuit after square wave conversion and amplitude detection;
the signal judging and controlling circuit is used for counting the rotating speed frequency signals, comparing the rotating speed frequency signals at a set frequency, and outputting an overspeed control signal when a measured value is greater than a set value;
and when the first detection channel and the second detection channel both output overspeed control signals to the overspeed relay of the engine, driving the overspeed relay to cut off the fuel supply loop of the engine.
And the signal discrimination and control circuits in the first detection channel and the second detection channel are connected with the state information management module and are used for exchanging and storing data.
Furthermore, the rotating speed signal conditioning circuit comprises a rotating speed signal acquisition circuit, a filtering amplification circuit, a square wave conversion circuit and an amplitude detection circuit;
the rotating speed signal acquisition circuit is used for acquiring rotating speed signals, amplitude limiting and anti-audio interference processing are carried out on the rotating speed signals, the processed rotating speed signals are amplified by the filter amplification circuit and then input into the square wave conversion circuit, the signals are converted into square wave signals and TTL level signals, and amplitude voltage detection is carried out through the amplitude detection circuit.
Furthermore, the signal distinguishing and controlling circuit comprises a photoelectric isolation circuit, a CPLD frequency distinguishing and logic control circuit and a driving control circuit;
the photoelectric isolation circuit is used for converting the +28V test switching value into a TTL level and outputting the TTL level to the CPLD frequency discrimination and logic control circuit, the CPLD frequency discrimination and logic control circuit counts frequency signals and compares the frequency signals with a set frequency, overspeed control signals are output after logic processing, and the overspeed control signals are amplified by the driving control circuit to drive the overspeed relay to cut off a fuel oil supply loop of the engine.
Furthermore, the state information management module comprises a CPU circuit and a memory circuit;
the CPU circuit is used for reading CPLD data and control data in the first detection channel and the second detection channel, storing the CPLD data and the control data in the memory circuit, and communicating with an upper computer.
Furthermore, a CPU circuit in the state information management module is communicated with an upper computer through an RS232 bus.
The invention discloses a monitoring and limiting circuit for the rotating speed of an aircraft engine, which has the beneficial effects that: the invention adopts two independent same channel detection and a state information management module monitored by microprocessing. The fuel supply cut-off signal is generated only when the two channels simultaneously obtain the overspeed signal, so that the unwanted malfunction can be avoided. Meanwhile, the state information management module completes the monitoring of the input/output state under the control of software. And can communicate with upper computer through RS232 bus, obtain the data of the product state when the trouble, isolate and position the trouble fast.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a circuit for monitoring and limiting the rotation speed of an aircraft engine according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a power supply printed board (a1) in the embodiment of the present invention;
fig. 3 is a schematic block diagram of an interface printed board (a2) according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a computer board (a3) according to an embodiment of the present invention;
fig. 5 is a flow chart of the CPLD program control logic in the embodiment of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
As shown in fig. 1, an embodiment of the present disclosure provides an aircraft engine rotational speed monitoring limiting circuit, including a first detection channel and a second detection channel respectively connected to an engine overspeed relay, where the first detection channel and the second detection channel both include a rotational speed signal conditioning circuit and a signal distinguishing and controlling circuit; the rotating speed signal conditioning circuit is used for filtering and amplifying a rotating speed signal, and outputting the rotating speed signal to the signal judging and controlling circuit after square wave conversion and amplitude detection; the signal judging and controlling circuit is used for counting the rotating speed frequency signals, comparing the rotating speed frequency signals at a set frequency, and outputting an overspeed control signal when a measured value is greater than a set value;
and when the first detection channel and the second detection channel both output overspeed control signals to the overspeed relay of the engine, driving the overspeed relay to cut off the fuel supply loop of the engine.
In the design method, two independent channels are adopted for detection, and the detection principle of the channel I (first detection channel) and the detection principle of the channel II (second detection channel) are the same, and the working mode is the same. Each detection channel comprises a rotation speed signal conditioning circuit (a rotation speed signal acquisition circuit, a filtering amplification circuit, a square wave conversion circuit and an amplitude detection circuit) and a signal distinguishing and controlling circuit (a photoelectric isolation circuit, a CPLD frequency distinguishing and logic control circuit and a driving control circuit). The system also comprises a state information management module (comprising a CPU circuit, a clock circuit, a watchdog circuit, a communication interface circuit, a memory circuit and a power supply conversion circuit), wherein the signal discrimination and control circuits in the first detection channel and the second detection channel are connected with the state information management module and are used for data exchange and storage.
The rotating speed signal conditioning circuit comprises: the rotating speed signal acquisition circuit is used for acquiring a rotating speed signal, amplitude limiting and anti-audio interference processing are carried out on the rotating speed signal, the processed rotating speed signal is amplified by the filter amplification circuit and then is input into the square wave conversion circuit to be converted into a square wave signal and a TTL level signal, amplitude voltage detection is carried out through the amplitude detection circuit, and then the square wave signal and the TTL level signal are input into the CPLD to be subjected to logic operation.
The signal distinguishing and controlling circuit: the +28V test switch value is converted into TTL level through the photoelectric isolation circuit and is input to the CPLD. The CPLD counts the frequency signals, compares the frequency signals with a set frequency, processes various input discrete quantities, and outputs a control signal through logic processing. And maintaining data exchange with the CPU, and transmitting various state data to the management module for processing. The overspeed control signal is amplified by the drive control circuit to drive the overspeed relay.
The state information management module: the CPU circuit reads the CPLD data and other various control states in the channel 1 and the channel II and then stores the data in the nonvolatile memory for storage, and the data in the nonvolatile memory is downloaded during maintenance by communicating with the outside through RS 232.
Taking the channel I as an example, the rotation speed signal is processed by the conditioning circuit I and then input to the CPLDI for counting comparison, when the frequency exceeds 13200 +/-50 Hz and the amplitude is more than 140mV, the relay K1 is closed, No and Ne are closed, and the overspeed signal is output.
The present invention will be further described with reference to the following examples.
The invention can be implemented in the following way, mainly comprising the following parts:
a) a power supply printed board (A1);
b) an interface printed board (A2);
c) a computer printed board (a 3);
the power supply printed board (A1) is composed of a DC/DC module, a surge suppression circuit, an isolation circuit, an energy storage circuit, a BIT circuit and a peripheral circuit. The schematic block diagram is shown in fig. 2.
The working principle of the power supply printed board (A1) is as follows: after the filter outputs 28V DC, a DC/DC conversion module generates 15VDC and 5VDC power supplies so as to meet various power supply requirements required by various printed boards of products; the energy storage circuit can ensure normal work when power is off within 50ms, and the characteristic requirements (peak, surge and terminal voltage change) of GJB 181-.
The interface printed board (A2) comprises a signal acquisition circuit, a filtering amplification circuit, an amplitude comparison circuit, a square wave generation circuit, a photoelectric isolation circuit, a driving circuit, a relay and the like. The schematic block diagram is shown in fig. 3.
The working principle of the interface printed board (A2) is as follows: the rotation speed signal is processed by amplitude limiting and anti-audio interference, then is conditioned into a square wave signal and a TTL level signal, and simultaneously, a frequency signal is amplified and converted into direct current voltage to be compared with amplitude voltage.
The control signal controls the overspeed indicator light and the overspeed actuating mechanism through the driving circuit.
The principle of operation of the computer printed board (a3) is shown in fig. 4: the square wave signal and the TTL level signal of the interface printed board (A2) are received, the overspeed control signal is output through logic operation and time delay processing, and the control signal drives the overspeed relay through the interface printed board (A2) to cut off a fuel supply loop of the engine.
The CPLD program control logic flow chart is shown in FIG. 5, the CPLD exchanges data with the CPU, transmits various state data to the state monitoring circuit, and the memory circuit records information such as frequency, amplitude, control signal state and the like of the rotating speed signal and downloads data through the RS232 communication interface.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (6)
1. The aircraft engine rotating speed monitoring and limiting circuit is characterized by comprising a first detection channel and a second detection channel which are respectively connected with an engine overspeed relay, wherein the first detection channel and the second detection channel respectively comprise a rotating speed signal conditioning circuit and a signal judging and controlling circuit;
the rotating speed signal conditioning circuit is used for filtering and amplifying a rotating speed signal, and outputting the rotating speed signal to the signal judging and controlling circuit after square wave conversion and amplitude detection;
the signal judging and controlling circuit is used for counting the rotating speed frequency signals, comparing the rotating speed frequency signals at a set frequency, and outputting an overspeed control signal when a measured value is greater than a set value;
and when the first detection channel and the second detection channel both output overspeed control signals to the overspeed relay of the engine, driving the overspeed relay to cut off the fuel supply loop of the engine.
2. The aircraft engine speed monitoring and limiting circuit according to claim 1, further comprising a status information management module, wherein the signal discrimination and control circuits in the first detection channel and the second detection channel are connected with the status information management module for data exchange and storage.
3. The aircraft engine speed monitoring and limiting circuit according to claim 1, wherein the speed signal conditioning circuit comprises a speed signal acquisition circuit, a filtering and amplifying circuit, a square wave conversion circuit and an amplitude detection circuit;
the rotating speed signal acquisition circuit is used for acquiring rotating speed signals, amplitude limiting and anti-audio interference processing are carried out on the rotating speed signals, the processed rotating speed signals are amplified by the filter amplification circuit and then input into the square wave conversion circuit, the signals are converted into square wave signals and TTL level signals, and amplitude voltage detection is carried out through the amplitude detection circuit.
4. The aircraft engine speed monitoring and limiting circuit according to claim 1, wherein the signal discrimination and control circuit comprises a photoelectric isolation circuit, a CPLD frequency discrimination and logic control circuit and a drive control circuit;
the photoelectric isolation circuit is used for converting the +28V test switching value into a TTL level and outputting the TTL level to the CPLD frequency discrimination and logic control circuit, the CPLD frequency discrimination and logic control circuit counts frequency signals and compares the frequency signals with a set frequency, overspeed control signals are output after logic processing, and the overspeed control signals are amplified by the driving control circuit to drive the overspeed relay to cut off a fuel oil supply loop of the engine.
5. The aircraft engine speed monitoring and limiting circuit according to claim 2, wherein the status information management module comprises a CPU circuit and a memory circuit;
the CPU circuit is used for reading CPLD data and control data in the first detection channel and the second detection channel, storing the CPLD data and the control data in the memory circuit, and communicating with an upper computer.
6. The aircraft engine speed monitoring and limiting circuit according to claim 5, wherein the CPU circuit in the state information management module is communicated with an upper computer through an RS232 bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011520807.XA CN112696272A (en) | 2020-12-21 | 2020-12-21 | Aeroengine rotational speed monitoring limiting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011520807.XA CN112696272A (en) | 2020-12-21 | 2020-12-21 | Aeroengine rotational speed monitoring limiting circuit |
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| CN112696272A true CN112696272A (en) | 2021-04-23 |
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| CN202011520807.XA Pending CN112696272A (en) | 2020-12-21 | 2020-12-21 | Aeroengine rotational speed monitoring limiting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202653A (en) * | 2021-05-21 | 2021-08-03 | 成都凯天电子股份有限公司 | Automatic measuring system for engine running data |
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