CN103712641A - Digital monitoring circuit and monitoring method of duplex three-wire system potentiometer sensor - Google Patents
Digital monitoring circuit and monitoring method of duplex three-wire system potentiometer sensor Download PDFInfo
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- CN103712641A CN103712641A CN201310667585.8A CN201310667585A CN103712641A CN 103712641 A CN103712641 A CN 103712641A CN 201310667585 A CN201310667585 A CN 201310667585A CN 103712641 A CN103712641 A CN 103712641A
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Abstract
The invention relates to a digital monitoring method of a duplex three-wire system potentiometer sensor, and belongs to the technical field of digitized monitoring of an aircraft front wheel turning sensor. The technology obtains signals of an aircraft front wheel turning pedal sensor and a feedback sensor through a conditioning circuit and inputs the signals to a CPU, the CPU compares collected data with predetermined sensor fault feature data, judges open circuit, short circuit, performance degradation, and normal state of the sensor according to a comparison result of three-terminal data of the sensor, and provides to a front wheel control system for judgment and processing. The detection technology of the sensor improves the fault detection rate of the sensor of an aircraft front wheel turning system, thereby improving reliability and safety of the front wheel turning system.
Description
Technical field
The digital supervision method that the present invention relates to a kind of duplex three-wire system potentiometric pick-up, belongs to monitor and detection field.
Background technology
Aircraft nose wheel turning system occupies very consequence in aircraft, if there is Nose Wheel Steering system sensor fault, means normally take-off and landing of aircraft, affect aircraft aerial mission and security, even cause fatal crass's accident.
Aircraft nose wheel turns to control at present mechanical control type, mechanical-hydraulic formula, electro-hydraulic servo formula etc.; What aircraft employing was at present maximum is electro-hydraulic servo formula front steer systems; System is mainly comprised of annexes such as instruction sensor, feedback transducer, turning controller, turning operation valve and turning pressurized struts; What wherein most instruction sensor and feedback transducer adopted is all duplex three-wire system potentiometric pick-up, and the power supply of sensors with auxiliary electrode were derives from turning controller, and the signal of sensor gathers by the CPU of controller; The sensor of turn control control system is correctly to reflect that pilot controls the critical component of aircraft turn command and the actual angle of turn of reflection aircraft; As can not be effectively detected monitoring to the performance of sensor and fault, may cause turning not according to right instructions in aircraft taxi process, affect aircraft safety.
Summary of the invention
Object of the present invention: design a kind of method that adopts the raising aircraft nose wheel turning system sensor fault verification and measurement ratio of digitizing technique, the reliability detecting to improve aircraft turning system sensor, the security that improves turning system.
The technical scheme that the present invention takes is: a kind of digital supervision circuit of duplex three-wire system potentiometric pick-up, comprises that sensor, high precision DC power supply out-put supply are V0, resistance R 1～R4, modulate circuit, processor CPU, A/D converter; Sensor (1) is two, has respectively power end, output and ground; The power end of sensor (2,7) is divided into two-way, is connected respectively by resistance R 1, R3 with the power output end of high precision DC power supply (6); Sensor hold (1) (4,9) be divided into two-way respectively by resistance R 2, R4 and power supply be connected; The power end of sensor (1) (2,7) outputs to processor CPU with the output terminal (3,8) of sensor (1) earth terminal (4,9) and sensor (1) by modulate circuit and through A/D converter.
The resistance of resistance R 1～R4 is 5%～10% of sensor (1).
A digital supervision method for duplex three-wire system potentiometric pick-up, adopts following steps:
Step 1: strap circuits;
Duplex three-wire system potentiometric pick-up (1) has duplex structure, contain power end (2,7), earth terminal (4,9), output terminal (3,8) each two-way, sensor (1) power end (2,7) two-way is connected with the power output end of high precision DC power supply (6) by resistance R 1, R3 respectively; Sensor (1) earth terminal (4,9) is connected with power supply ground end by resistance R 2, R4 respectively; The output terminal (3,8) of the power end of sensor (1) (2,7), sensor (1) earth terminal (4,9) and sensor (1) is connected with modulate circuit (5);
Step 2: Sensor Analog Relay System signal condition;
Modulate circuit (5) is to the signal condition of sensor in step 1 (1) input and carry out low-pass filtering, filtering cutoff frequency 0.5kHz, final sensor (1) power end conditioned signal V3, V6, earth terminal conditioned signal V2, V5, output terminal conditioned signal V1, the V4 of forming;
Step 3: convert the simulating signal after conditioning to digital signal;
A/D converter converts V1～V6 signal to digital signal to CPU;
Step 4: data monitoring is processed;
CPU is to V1～V6 voltage signal acquisition and data processing, and according to following characteristics value, carries out the judgement of the fault type of sensor:
1) CPU gathers V3, V6 voltage are V0, or the V2 gathering in CPU, V5 voltage be less than 0.1 volt, represent duplex three-wire system potentiometric pick-up 1 or 2 open circuit faults;
2) CPU gathers V3, V6, V2, V5 voltage difference are less than 0.1*V0, represent that duplex three-wire system potentiometric pick-up 1 or 2 is associated with short circuit;
3) V1 gathering in CPU, V4 voltage difference is greater than 0.1*V0, represent that duplex three-wire system potentiometric pick-up 1 or 2 is associated with hydraulic performance decline, whether combination (V3-V2) and voltage difference (V6-V5) be at (0.1*V0 again, 0.9*V0) scope, within the scope of this, represent that sensor parameters declines, and needs more emat sensor.
Beneficial effect of the present invention: the digital supervision method of a kind of duplex three-wire system of the present invention potentiometric pick-up, make the failure checking cover ratio of sensor high, localization of fault is accurate, has realized the real-time monitoring of fault, has improved the maintainability of the sensor of aircraft turning system; By the digitizing of sensing data, the sensing data gathering is comprehensively judged to the state of sensor by predetermined logical relation, guarantee the correctness that aircraft turning is controlled and slide safety.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the digital supervision method of duplex three-wire system potentiometric pick-up;
Wherein, 1-sensor, 2-sensor 1 power end, 3-sensor 1 output terminal, 4-sensor 1 earth terminal, 5-modulate circuit, 6-high precision DC power supply, 7-sensor 2 power ends, 8-sensor 2 output terminals, 9-sensor 2 earth terminals.
Fig. 2 is schematic flow sheet of the present invention.
Embodiment
Below in conjunction with specific embodiment and Figure of description, the present invention is described in further detail.
A digital supervision method for duplex three-wire system potentiometric pick-up, comprises that sensor, high precision DC power supply output voltage are V0, resistance R 1～R4, modulate circuit, processor CPU, A/D converter; Sensor 1 is two, has respectively power end, output and ground; The power end 2,7 of sensor is divided into two-way, is connected respectively by resistance R 1, R3 with the power output end of high precision DC power supply 6; Sensor 1 ground end 4,9 be divided into two-way respectively by resistance R 2, R4 and power supply be connected; The output terminal 3,8 of the power end 2,7 of sensor 1 and sensor 1 earth terminal 4,9 and sensor 1 outputs to processor CPU by modulate circuit and through A/D converter, as shown in Figure 1.
The resistance of resistance R 1～R4 is 5%～10% of sensor 1.
The digital supervision method of above-mentioned duplex three-wire system potentiometric pick-up, its process as shown in Figure 2, is specially:
Step 1: strap circuits;
Duplex three-wire system potentiometric pick-up 1 has duplex structure, contains power end 2,7, earth terminal 4,9, and output terminal 3,8 each two-way, sensor 1 power end 2,7 two-way are connected with the power output end of high precision DC power supply 6 by resistance R 1, R3 respectively; Sensor 1 earth terminal 4,9 is connected with power supply ground end by resistance R 2, R4 respectively; The power end 2,7 of sensor 1, the output terminal 3,8 of sensor 1 earth terminal 4,9 and sensor 1 is connected with modulate circuit 5;
Step 2: Sensor Analog Relay System signal condition;
The signal condition that in 5 pairs of steps 1 of modulate circuit, sensor 1 is inputted also carries out low-pass filtering, and filtering cutoff frequency 0.5kHz, finally forms sensor 1 power end conditioned signal V3, V6, earth terminal conditioned signal V2, V5, output terminal conditioned signal V1, V4;
Step 3: convert the simulating signal after conditioning to digital signal;
A/D converter converts V1～V6 signal to digital signal to CPU;
Step 4: data monitoring is processed;
CPU is to V1～V6 voltage signal acquisition and data processing, and according to following characteristics value, carries out the judgement of the fault type of sensor:
1) CPU gathers V3, V6 voltage are V0, or the V2 gathering in CPU, V5 voltage be less than 0.1 volt, represent duplex three-wire system potentiometric pick-up 1 or 2 open circuit faults;
2) CPU gathers V3, V6, V2, V5 voltage difference are less than 0.1*V0, represent that duplex three-wire system potentiometric pick-up 1 or 2 is associated with short circuit;
3) V1 gathering in CPU, V4 voltage difference is greater than 0.1*V0, represent that duplex three-wire system potentiometric pick-up 1 or 2 is associated with hydraulic performance decline, whether combination (V3-V2) and voltage difference (V6-V5) be in 0.1*V0～0.9*V0 scope again, within the scope of this, represent that sensor parameters declines, and needs more emat sensor.
Inventive principle: this technology is conceived to the digitizing technique of sensor signal, design and a kind of the six line signals such as the power end of three-wire system two potentiometric pick-ups, output terminal, earth terminal are monitored, by data acquisition system (DAS), sensor six line signals are all collected to the logical process of carrying out data in CPU, thereby compare judgement sensor states with the characteristic of default sensor fault, the digital monitoring of realization to sensor, the failure checking cover ratio of raising sensor.
Embodiment:
In Fig. 1, the probe power end interface 2,7 of duplex three-wire system potentiometric pick-up 1, sensor earth terminal interface 4,9 are respectively by resistance R 1, resistance R 3, resistance R 2, resistance R 4 are connected with power supply output and the power supply ground of high precision DC power supply 6, here suppose power supply output V scope 4.9～5V, sensor 1 resistance is 5k Ω, power taking resistance 1, resistance 2, resistance 3, resistance 4 are respectively 250 Ω, high precision DC power supply 6 out-put supply 5V; In Fig. 1, signal conditioning circuit 5 has formed the conditioning circuit module 5 containing filter function by devices such as conditioning resistance, electric capacity, amplifier device, switching diodes, it nurses one's health into the power end voltage signal of sensor 1 V3, the V6 of (4.9 ± 0.1) V, sensor 1 signal output part voltage is nursed one's health into V1, the V4 of 0.2V～4.8V, by V2, the V5 signal of sensor 1 earth terminal voltage signal conditioning (0.2 ± 0.1) V; In Fig. 1, A/D converter input range is ± 5V, converts V1～V6 signal of sensor 1 output to digital signal and is input in CPU.
The data area that designs V3, V6 in CPU is 4.8V～4.9V, the data area of V2, V5 is 0.1V～0.2V, | the data area of V3-V2| is 4.6V～4.8V, and the data area of V1, V4 is 0.2V～4.8V, | the scope of V1-V4| is 0V～0.5V, and fault detect judgement is as follows:
1) when V3 detected value is for being greater than 4.9V and V2 value detected value is less than 0.1V, judge to open circuit in 1 of sensor 1;
2) with should V6 detected value for being greater than 4.9V and V5 value detected value is less than 0.1V, judge to open circuit in 2 of sensor 1;
3) when | the data area of V3-V2| is less than 4.6V and is greater than 4.0V, illustrate sensor 1 hydraulic performance decline 10% left and right, should carry out more emat sensor;
4) when | the data area of V6-V5| is less than 4.6V and is greater than 4.0V, illustrate sensor 2 hydraulic performance declines 10% left and right, should carry out more emat sensor;
5) when | the data area of V3-V2| illustrates that in 0V～0.5V short trouble or power fail have occurred sensor 1, should carry out more emat sensor or power supply and detect;
6) when | the data area of V6-V5| illustrates that in 0V～0.5V short trouble or power fail have occurred sensor 2, should carry out more emat sensor or power supply and detect.
Claims (3)
1. a digital supervision circuit for duplex three-wire system potentiometric pick-up, is characterized in that: comprise that sensor, high precision DC power supply out-put supply are V0, resistance R 1～R4, modulate circuit, processor CPU, A/D converter; Sensor (1) is two, has respectively power end, output and ground; The power end of sensor (2,7) is divided into two-way, is connected respectively by resistance R 1, R3 with the power output end of high precision DC power supply (6); Sensor hold (1) (4,9) be divided into two-way respectively by resistance R 2, R4 and power supply be connected; The power end of sensor (1) (2,7) outputs to processor CPU with the output terminal (3,8) of sensor (1) earth terminal (4,9) and sensor (1) by modulate circuit and through A/D converter.
2. the digital supervision circuit of duplex three-wire system potentiometric pick-up according to claim 1, is characterized in that: the resistance of resistance R 1～R4 is 5%～10% of sensor (1) resistance.
3. a digital supervision method for duplex three-wire system potentiometric pick-up, is characterized in that: comprise the following steps:
Step 1: strap circuits;
Duplex three-wire system potentiometric pick-up (1) has duplex structure, contain power end (2,7), earth terminal (4,9), output terminal (3,8) each two-way, sensor (1) power end (2,7) two-way is connected with the power output end of high precision DC power supply (6) by resistance R 1, R3 respectively; Sensor (1) earth terminal (4,9) is connected with power supply ground end by resistance R 2, R4 respectively; The output terminal (3,8) of the power end of sensor (1) (2,7), sensor (1) earth terminal (4,9) and sensor (1) is connected with modulate circuit (5);
Step 2: Sensor Analog Relay System signal condition;
Modulate circuit (5) is to the signal condition of sensor in step 1 (1) input and carry out low-pass filtering, filtering cutoff frequency 0.5kHz, final sensor (1) power end conditioned signal V3, V6, earth terminal conditioned signal V2, V5, output terminal conditioned signal V1, the V4 of forming;
Step 3: convert the simulating signal after conditioning to digital signal;
A/D converter converts V1～V6 signal to digital signal to CPU;
Step 4: data monitoring is processed;
CPU is to V1～V6 voltage signal acquisition and data processing, and according to following characteristics value, carries out the judgement of the fault type of sensor:
1) CPU gathers V3, V6 voltage are V0, or the V2 gathering in CPU, V5 voltage be less than 0.1 volt, represent duplex three-wire system potentiometric pick-up 1 or 2 open circuit faults;
2) CPU gathers V3, V6, V2, V5 voltage difference are less than 0.1*V0, represent that duplex three-wire system potentiometric pick-up 1 or 2 is associated with short circuit;
3) V1 gathering in CPU, V4 voltage difference is greater than 0.1*V0, represent that duplex three-wire system potentiometric pick-up 1 or 2 is associated with hydraulic performance decline, whether combination (V3-V2) and voltage difference (V6-V5) be at (0.1*V0 again, 0.9*V0) scope, within the scope of this, represent that sensor parameters declines, and needs more emat sensor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092175A (en) * | 2016-07-22 | 2016-11-09 | 西北工业大学 | The frequency characteristics measurement system of a kind of resonant transducer and implementation method |
| CN111486929A (en) * | 2020-05-07 | 2020-08-04 | 合肥邦立电子股份有限公司 | Three-wire linear liquid level sensor based on magnetic resistance non-contact |
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| CN103074995A (en) * | 2013-02-02 | 2013-05-01 | 赵明 | Safety protection device for building hanging basket |
| CN103344271A (en) * | 2013-07-22 | 2013-10-09 | 中国航空动力机械研究所 | Sensor fault diagnosis device and method and signal acquisition system of sensors |
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Patent Citations (5)
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| JPH10221127A (en) * | 1997-02-05 | 1998-08-21 | Yokogawa Electric Corp | Sensor-signal conversion circuit |
| US20020056310A1 (en) * | 1997-04-23 | 2002-05-16 | Denso Corporation | Control method for gas concentration sensor |
| CN102706505A (en) * | 2012-05-31 | 2012-10-03 | 西北工业大学 | Redundancy device for aircraft electric brake pressure sensor and method for controlling redundancy device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106092175A (en) * | 2016-07-22 | 2016-11-09 | 西北工业大学 | The frequency characteristics measurement system of a kind of resonant transducer and implementation method |
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Application publication date: 20140409 |