CN110276857A - A kind of processing method and circuit of aero-engine pressure sensor signal - Google Patents
A kind of processing method and circuit of aero-engine pressure sensor signal Download PDFInfo
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- CN110276857A CN110276857A CN201811575072.3A CN201811575072A CN110276857A CN 110276857 A CN110276857 A CN 110276857A CN 201811575072 A CN201811575072 A CN 201811575072A CN 110276857 A CN110276857 A CN 110276857A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C5/00—Registering or indicating the working of vehicles
- G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
- G07C5/0841—Registering performance data
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Abstract
Aiming at the problem that the faint differential signal of complexity of certain type aero-engine accessory power system pressure sensor output is difficult to acquire, a kind of aero-engine accessory power system pressure sensor signal acquisition method is invented, realizes the precise acquisition to aero-engine accessory power system pressure sensor signal.The method includes EMI protection unit, passive low-pass filter unit, differential amplification unit, active second-order low-pass filter units.Design of the invention is simple, and strong antijamming capability, output signal is strong, and acquisition precision is high.Opposite classical signal acquisition system, can be applied in aero-engine Conditioning Circuits of Sensor use, and have extremely strong versatility.
Description
Technical field
The technical field of the invention is aero-engine accessory power system Signal Collection Technology field.
Background technique
In the second dynamic field, accessory power system (APS) is a system independently of aircraft engine, can be winged
Machine provides the functions such as engine fast starting, aerial emergency guarantee, cockpit bleed and power supply.
Nowadays in each unit of accessory power system, electric sensor number of applications is more and more, gradually
Replace tradition machinery sensing device.Many sensors be mainly used in high temperature, high vibration adverse circumstances under, output letter
It is number extremely complex, it is all often millivolt level, and noise jamming is strong, poor linearity.Therefore for auxiliary power unit (APU)
The fuel pressure signal of subsystem (EPU), accessory drive unit lubricating oil pressure letter occur for compressor intake pressure signal, emergency
The acquisition of number equal pressure sensor signals is very crucial, and acquisition precision directly influences entire engine auxiliary power system
Runnability.
Since existing Signal Collection Technology rarely has the pressure sensor signal for the system precisely to be acquired, because
This is very crucial to the design work of the pressure sensor small-signal acquisition method of aero-engine accessory power system.
Summary of the invention
The processing method of aero-engine pressure sensor signal provided by the invention is realized and assists moving to aero-engine
The precise acquisition of Force system pressure sensor signal.
First invention, the present invention provide a kind of processing method of aero-engine pressure sensor signal, the method packet
It includes:
Receive the pressure signal of aero-engine pressure sensor output；
Protective treatment is carried out to the pressure signal by EMI protection unit；
Pressure signal after the protective treatment, is filtered by low-pass filter unit；
Pressure signal after the filtering processing carries out signal enhanced processing by differential amplification unit；
Pressure signal after the signal enhanced processing is carried out at second-order filter by second-order low-pass filter unit
Reason obtains and finally meets the signal that the acquisition of rear class analog-digital converter requires.
Optionally, the processing circuit includes EMI protection unit, low-pass filter unit, differential amplification unit, step low-pass
Filter unit, in which: the EMI protection unit connect with the low-pass filter unit, the low-pass filter unit and the difference
The connection of point amplifying unit, the differential amplification unit connects with the differential amplification unit, the differential amplification unit connects and
The second-order low-pass filter unit connection, specific:
The EMI protection unit, for receiving the pressure signal of aero-engine pressure sensor output, to the pressure
Signal carries out protective treatment；
The low-pass filter unit, for being filtered to the pressure signal after the protective treatment；
The differential amplification unit, for carrying out signal enhanced processing to the pressure signal after the filtering processing；
The second-order low-pass filter unit, for carrying out second order filter to the pressure signal after the signal enhanced processing
Wave processing obtains and finally meets the signal that the acquisition of rear class analog-digital converter requires.
Optionally, the EMI protection unit is realized by L-type electromagnetic interface filter, the L-type electromagnetic interface filter include inductance and
Capacitor.
Optionally, the low-pass filter unit is realized by RC low-pass filter, the RC low-pass filter include resistance and
Capacitor.
Optionally, the differential amplification unit is realized by differential operational amplifier and configuration circuit, is put for analog signal
Greatly.
Optionally, the second-order low-pass filter unit includes resistance, capacitor and operational amplifier.
In conclusion the present invention with respect to classical signal acquisition system, can be applied in engine sensor conditioning circuit make
With with extremely strong versatility, and design is simple, and strong antijamming capability, output signal is strong, and acquisition precision is high.With practicability
By force, and circuit noise is low, small power consumption, stability are good advantage.
Detailed description of the invention
Fig. 1 is the design of pressure sensor signal acquisition method functional block diagram；
Fig. 2 simplifies circuit diagram；
Fig. 3 is pressure sensor signal acquisition circuit schematic diagram.
Specific embodiment
It is an object of the present invention to the complexity for the output of certain type aero-engine accessory power system pressure sensor is faint
Differential signal is difficult to the problem of acquiring, and invents a kind of small-signal acquisition method, realizes to aero-engine accessory power system
The precise acquisition of pressure sensor signal.
To achieve the goals above, technical scheme is as follows: a kind of aero-engine accessory power system pressure
Collecting sensor signal method, the scheme includes EMI protection unit, passive low-pass filter unit, differential amplification unit, active
Second-order low-pass filter unit.
It is anti-that the pressure signal of accessory power system pressure sensor output first passes around EMI protection unit progress EMI
Then shield makes the noise attentuation outside frequency range by passive low-pass filter unit, using differential amplification unit by millivolt level
Analog signal is amplified in suitable range, and amplified signal carries out second order filter using active second-order low-pass filter unit
Wave, the filtered output signal can be directly output to rear class analog-digital converter, measure to the analogue value.
To meet EMI protection demand, inductance and capacitance group l-shaped EMI are selected in the design of EMI protection unit in the scheme
Filter, the frequency range protected as needed select suitable cutoff frequencyMake making an uproar outside frequency range
Acoustic attenuation.
Passive low-pass filter unit is designed as being made of cutoff frequency resistance and capacitor being f in the signal acquisition methodL
Low-pass filter, effect are only to allow frequency band in 0~fLInterior signal passes through.To make the circuit filter out the high frequency in signal
Interference signal retains useful signal, guarantees circuit acquisition precision.
Differential amplification unit is designed as the difference ratio enlargement electricity being made of operational amplifier in the signal acquisition method
Road, amplification factorIt has the characteristics that output signal is strong, strong antijamming capability, therefore is suitble in engine
It is used in Conditioning Circuits of Sensor, is able to ascend the anti-interference ability of circuit.
Active second-order low-pass filter unit is designed as by resistance, capacitor and Amplifier Design one in the signal acquisition method
A cutoff frequency isLow-pass filter, effect are only frequency band to be allowed to existInterior signal passes through, to this tested sensing
Interference signal in device signal is all filtered out, and improves the driving capability of rear class output.
The invention has the benefit that
The present invention can be applied in engine sensor conditioning circuit use with respect to classical signal acquisition system, have pole
Strong versatility.
Design of the invention is simple, and strong antijamming capability, output signal is strong, and acquisition precision is high.
The present invention is practical, and circuit noise is low, small power consumption, stability are good.Design pressure sensor signal of the present invention
The purpose of acquisition method is exactly the millivolt level electricity that the complexity of aero-engine accessory power system pressure sensor output is faint
Pressure signal is converted to the voltage signal for meeting analog-digital converter testing requirements.
As shown in Figure 1, it includes that EMI protection is single that the small-signal Acquisition Circuit designed in the present invention, which includes: the scheme,
Member, passive low-pass filter unit, differential amplification unit, active second-order low-pass filter unit.
As shown in Fig. 2, small-signal UiFirst pass around inductance L, capacitor C1、C2The EMI protection unit of composition, then passes through
By resistance R5、R6With capacitor C6、C7、C8The passive low-pass filter unit of composition, using difference amplifier, amplification factor k=
Millivolt level analog signal is amplified in suitable range by (49400/R1)+1, and amplified signal is using by resistance R7、R8,
Capacitor C9、C10With the active second-order low-pass filter of operational amplifier composition, the filtered output signal U0It can directly export
To rear class analog-digital converter, the analogue value is measured.
For convenience of description, symmetrical resistance, inductance and capacitor are indicated using the same symbol.The capacitive reactance of capacitor C is ZC,
I.e.The induction reactance of inductance L is ZL, i.e. ZL=SL.It is complete that the circuit can be obtained according to basic principle of circuit node current method
Whole transmission function form are as follows:
Below with reference to the signal acquisition method in certain type aero-engine accessory power system electronic controller project
Practical application specifically explains the device selection and configuration mode and using effect of this signal acquisition method.
As shown in figure 3, in the EMI protection unit, it is contemplated that capacitive reactance is minimum at the resonance point of capacitor, in order to keep it total
Vibration point moves back, and EMI protection unit selects the combining form of LCC.Work as C1=C3=4.7nF, C2=C4=330pF, L1=L2=
1.2uH, cutoff frequency 2MHz.
In the passive low-pass filter unit, work as R5=R6=4.7K Ω, C7=C8=10nF, C6It is passive when=10nF
Low-pass cut-off frequencies are fL=1038.7Hz.
In the differential amplification unit, R1=510 Ω, are calculated K=-97.9.
In the active second-order low-pass filter unit, work as R8=R9=10K Ω, C9=C10When=47nF, active low pass is cut
Only frequency is f* L=311.7Hz.
It is 0mV~100mV by voltage range in the signal acquisition method, frequency range is being somebody's turn to do for 0Hz~20Hz
To [0V, 10V], the total low-pass cut-off frequencies of front stage are for h type engine h accessory power system pressure sensor signal voltage amplification
210Hz, amplifying error in filtering is ± 0.5%.
The type electronic controller has delivered user's use, and pressure sensor signal acquisition method meets the operation is stable, can
It leans on, the precise acquisition of complicated faint pressure signal may be implemented.
It should be clear that the invention is not limited to specific configuration described above and shown in figure and processing.
For brevity, it is omitted here the detailed description to known method.In the above-described embodiments, several tools have been described and illustrated
The step of body, is as example.Those skilled in the art can be variously modified after understanding spirit of the invention, modify and
Addition.
Claims (6)
1. a kind of processing method of aero-engine pressure sensor signal, which is characterized in that the described method includes:
Receive the pressure signal of aero-engine pressure sensor output；
Protective treatment is carried out to the pressure signal by EMI protection unit；
Pressure signal after the protective treatment, is filtered by low-pass filter unit；
Pressure signal after the filtering processing carries out signal enhanced processing by differential amplification unit；
Pressure signal after the signal enhanced processing carries out second-order filter processing by second-order low-pass filter unit, obtains
It obtains and finally meets the signal that the acquisition of rear class analog-digital converter requires.
2. a kind of processing circuit of aero-engine pressure sensor signal, which is characterized in that the processing circuit includes EMI anti-
Protect unit, low-pass filter unit, differential amplification unit, second-order low-pass filter unit, in which: the EMI protection unit with it is described
Low-pass filter unit connection, the low-pass filter unit connect with the differential amplification unit, the differential amplification unit and institute
State differential amplification unit connection, the differential amplification unit connection connect with the second-order low-pass filter unit, specifically:
The EMI protection unit, for receiving the pressure signal of aero-engine pressure sensor output, to the pressure signal
Carry out protective treatment；
The low-pass filter unit, for being filtered to the pressure signal after the protective treatment；
The differential amplification unit, for carrying out signal enhanced processing to the pressure signal after the filtering processing；
The second-order low-pass filter unit, for being carried out at second-order filter to the pressure signal after the signal enhanced processing
Reason obtains and finally meets the signal that the acquisition of rear class analog-digital converter requires.
3. processing circuit according to claim 2, it is characterised in that: the EMI protection unit is by L-type electromagnetic interface filter
It realizes, the L-type electromagnetic interface filter includes inductance and capacitor.
4. processing circuit according to claim 2, it is characterised in that: the low-pass filter unit is real by RC low-pass filter
Existing, the RC low-pass filter includes resistance and capacitor.
5. processing circuit according to claim 2, it is characterised in that: the differential amplification unit is by differential operational amplifier
And configuration circuit is realized, is amplified for analog signal.
6. processing circuit according to claim 2, it is characterised in that: the second-order low-pass filter unit includes resistance, electricity
Appearance and operational amplifier.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811575072.3A CN110276857A (en) | 2018-12-21 | 2018-12-21 | A kind of processing method and circuit of aero-engine pressure sensor signal |
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| CN201811575072.3A CN110276857A (en) | 2018-12-21 | 2018-12-21 | A kind of processing method and circuit of aero-engine pressure sensor signal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111122170A (en) * | 2019-11-28 | 2020-05-08 | 中国航空工业集团公司西安航空计算技术研究所 | High-precision resistance signal conditioning circuit and method based on current source |
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| CN111122170A (en) * | 2019-11-28 | 2020-05-08 | 中国航空工业集团公司西安航空计算技术研究所 | High-precision resistance signal conditioning circuit and method based on current source |
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