CN1557664A - Bus type intelligent sensor set for state monitoring - Google Patents
Bus type intelligent sensor set for state monitoring Download PDFInfo
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- CN1557664A CN1557664A CNA2004100007308A CN200410000730A CN1557664A CN 1557664 A CN1557664 A CN 1557664A CN A2004100007308 A CNA2004100007308 A CN A2004100007308A CN 200410000730 A CN200410000730 A CN 200410000730A CN 1557664 A CN1557664 A CN 1557664A
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Abstract
The bus-type intelligent sensor set for state monitoring and fault diagnosis integrates multiple sensor multiple parameter data fusion, signal conditioning, intelligent data acquisition and on-line communication network, and can extract the running state information of vehicles and other apparatus in complicated structure, harsh operation environment and complicated interference signal. The state information obtained with the sensors is processed in channel selection, current/voltage conversion, coupling, program controlled filtering, envelope demodulation, filtering and other circuits, A/D converted with CPU and CPLD, and stored in RAM, and the conversion results are fed via photoelectronic isolating CAN interface to in-situ communication network, so as to provide the upper state monitoring and fault diagnosing system unit with reliable state information. The present invention has the advantages of intelligent measurement, high reliability, high precision, etc.
Description
Technical field
The present invention relates to a kind of bus type intelligent sensor groups that is used for condition monitoring and fault diagnosis, particularly a kind of multisensor many reference amounts data fusion, signal condition, intelligent data acquisition, on-scene communication network of integrating, adopt isolated form CAN fieldbus, have intelligent measure, reliable transmission, the antivibration antijamming capability is strong, conversion accuracy is high intelligent transducer group, be applicable to aspects such as the on-line condition monitoring of equipment under the complicated mal-condition and trouble diagnosing.
Background technology
In traditional equipment condition monitoring and fault localization system, often use many sensors and data trap to form condition monitoring and failure diagnosis system, and these sensors all are analog sensors; Under many situations, sensor is far away with the data trap distance, often above tens meters even reach hundreds of rice; And equipment operating environment generally all compares badly, consumer such as motor, rectifying device produces strong electromagnetic interference, the power frequency of high frequency electric source line is disturbed, common ground impedance between measuring system and each element circuit also can produce serious disturbance, more than these interference sources all can produce very big interference to condition monitoring system, cause system to be difficult to normal operation; For addressing these problems, take the interference protection measure of many complexity usually, make the system architecture complexity, cost is very high, and poor effect.Therefore, how making sensor signal carry out long-distance transmissions accurately and reliably, is an of crucial importance and actual problem really, this purpose of the present invention just.
Adopt the long line of analog signal to transmit, no matter be the frequency signal after bipolar voltage signal, current signal, the voltage-frequency conversion, or the analog signal after the photoelectricity isolation, all be subjected to the interference of external electromagnetic ripple easily; And, the loss on the circuit to be arranged inevitably because transmission route is long, so just be difficult to guarantee to transmit precision.Traditional condition monitoring system generally is made of sensor+intelligence instrument, except that foregoing deficiency, also has following shortcoming: (1) texture ratio disperses, and is not easy to facilities for observation running condition and in time overhauls; (2) the various operations of intelligence instrument (as zeroing, limit value, precision) cause its accuracy relatively poor all because of environment and human element; (3) generally all there is more data collection point (to being example, it has two bogie trucks with the wheel of DF4B diesel locomotive, and 4 wheels are right, needs 32 measurement points at least) in system, adopts traditional approach to realize very difficulty, and the cost height; (4) all the measuring point sensor is directly received a condition monitoring and fault diagnosis main frame, except that complex circuit, difficult in maintenance, site environment do not allow, also because the collection point is many, frequency acquisition is higher, and system requires high especially to the accuracy of data transmission, the real-time of processing, therefore, be difficult to get a desired effect.Given this, the present invention selects the CAN fieldbus to build data platform, and sensor signal is carried out intellectuality nearby and handle, network transmission measurement information, it has had the advantage of alerting ability, real-time, accuracy, reliability each side concurrently.
Summary of the invention
The object of the present invention is to provide a kind of multisensor many reference amounts data fusion, signal condition, intelligent data acquisition, on-scene communication network of integrating, be applicable to the bus type intelligent sensing device of signal extraction, data acquisition and the transmission of the vehicle of complex structure, work under bad environment, interfering signal complexity and other equipment on-line monitoring and trouble diagnosing.
The objective of the invention is to realize: extract running state information nearby by the combination sensor that is installed in each check point of measurand by following approach, behind circuit such as channel selecting, current/voltage-converted and amplification, program control filtering, envelope demodulation, anti-aliasing filtering and auto-scaling amplification, it is carried out analogue to digital conversion and be kept among the RAM by CPU and CPLD, transformation result is delivered to the on-scene communication network through photoelectricity isolated form CAN interface, for upper condition monitoring and fault diagnosis main frame provides the reliable device running state information.
Bus type condition monitoring intelligent transducer group of the present invention comprises combination sensor, intelligent data acquisition device and CAN bus three parts, combination sensor adopts the transmission of four-core shielding wire, two kinds of output forms of electric current and voltage are arranged, by the signal conditioning circuit formation of piezoelectric acceleration sensor, digital temperature sensor and amplifier and resistance capacitance composition; Data acquisition unit is made up of sensor input interface and channel selection circuit, current/voltage-converted circuit, coupled modes selection circuit, program control filtering circuit, integration selection circuit, envelope demodulation circuit, anti-aliasing filtering and anti-resonance circuit, auto-scaling amplifying circuit, CPU and peripheral circuit, CAN interface circuit and power circuit etc.; The CAN bus is 4 line systems cable power supply modes altogether, and signal wire (SW) adopts high-speed photoelectric coupler to isolate.
The multiple useful signal processing method of integrated use of the present invention can be extracted the status information such as vibration, impact, temperature, speed of measurand, and is very suitable to the comprehensive accurate diagnosis that carries out many reference amounts, many standards; Adopt isolated form CAN bus architecture; utilize high-speed photoelectric coupler to realize electrical isolation between transceiver and the controller; protect internal circuit reliably; avoid external disturbance; can conveniently constitute networked TT﹠C system; being convenient to industry spot uses; meet the ISO11898 standard fully; electromagnetic radiation (EME) is very low; differential receiver has the common mode range of broad; can anti-electromagnetic interference (EMI) ability strong, have unique advantage aspect the condition monitoring and fault diagnosis that solves under the occasions such as complex structure, work under bad environment, interfering signal be numerous and diverse.Characteristics such as the present invention has that integrated level height, survey precision height, antivibration antijamming capability are strong, good stability, cost are low; Its comprehensive technical indexes is: (1) bus transfer rate≤1Mbps, transmission distance≤10Km, node number 〉=110; (2) passage: 1～8 channel voltage or current signal; (3) measurement range: acceleration/accel 0.1～199.9m/s
2(unimodal value 0.5～20KHz), speed: 0.01～19.99cm/s (effective value), displacement: 0.001～1.999mm (peak-to-peak value), temperature :-55 ℃～+ 125 ℃; (4) coupled modes: exchange, direct current is optional; (5) program control filtering: all-pass, low pass, high pass, band lead to, trap is optional, and characteristic frequency is adjustable (flex point place decay 5%, rate of decay 24dB/oct); (6) Integral Processing: do not add integration, integration, quadratic integral; (7) envelope demodulation: on/off; (8) anti-aliasing filtering: 100Hz～20KHz continuous variable; (9) sampling number: 256,512,1024,2048,4096,8192 is optional; (10) retention performance: observed reading keeps automatically, and the time-delay automatic stand-by has bus and wakes (long-range) function up.
Description of drawings
The present invention is further detailed explanation below in conjunction with accompanying drawing, wherein:
Fig. 1 is principle of the invention block diagram and uses example is installed;
Fig. 2 is a combination sensor functional block diagram of the present invention;
Fig. 3 is the typical circuit schematic diagram of combination sensor embodiment of the present invention;
Fig. 4 is a channel selecting functional block diagram of the present invention;
Fig. 5 is the typical circuit schematic diagram of current/voltage-converted of the present invention;
Fig. 6 is that coupled modes of the present invention are selected and the program control filtering functional block diagram;
Fig. 7 is the typical circuit schematic diagram that integration of the present invention is selected;
Fig. 8 is the typical circuit schematic diagram of envelope demodulation of the present invention;
Fig. 9 is anti-aliasing filtering of the present invention and anti-resonance functional block diagram;
Figure 10 is the typical circuit schematic diagram that auto-scaling of the present invention amplifies and A/D changes;
Figure 11 is the typical circuit schematic diagram of CAN field-bus interface of the present invention and power supply.
The specific embodiment
Bus type condition monitoring intelligent transducer group of the present invention comprises combination sensor, intelligent data acquisition device and three parts of isolated form CAN bus, can be widely used in aspects such as the on-line condition monitoring of equipment under the complicated mal-condition and trouble diagnosing, be that example is introduced with the right condition monitoring of Bearing of Railway Locomotive Wheel Set below.
Be the sensor mounting means in Train Wheel is used condition monitoring as shown in Figure 1, eight sensor CH1～CH8 among the figure are installed in each right measuring point of wheel respectively, wherein CH1, CH2 measuring pulley are to the running state of two bearings, rim and treads etc., CH3, CH4 measure the mode of operation of two bearings of motor, rotor, stator etc., CH5, CH6 measure the mode of operation of two axle hung bearings, the state of CH7 prototype gear case, CH8 measures drive motor axial vibration.Isolated form CAN bus be used to connect other sensor groups and locomotive state monitoring and fault diagnosis main frame formed a locomotive running state monitoring network.This monitoring network to being that unit focuses on and be converted to digital signal nearby on the spot with analog signal, is carried out data transmission by isolated form CAN bus with wheel; Have simple in structure, cost is low, reliability is high, the antivibration antijamming capability is strong, long transmission distance (maximum 10Km), the wide characteristics such as (can connect 110 sensor groups at least) of monitoring range., show unique characteristics to aspect the acquisition of signal and transmission of state on_line monitoring and trouble diagnosing in the Train Wheel of complex structure, work under bad environment, interfering signal complexity.Each sensor groups hardware mainly comprises sensor, sensor input interface and channel selection circuit, current/voltage-converted circuit, coupled modes selection circuit, program control filtering circuit, integration selection circuit, envelope demodulation circuit, anti-aliasing filtering and anti-resonance circuit, auto-scaling amplifying circuit, CPU and peripheral circuit, CAN interface circuit and power circuit etc.
Combination sensor of the present invention adopts the transmission of four-core shielding wire, two kinds of output forms of electric current and voltage are arranged, Fig. 2 is the combination sensor functional block diagram, by the signal conditioning circuit formation of piezoelectric acceleration sensor, digital temperature sensor and amplifier and resistance capacitance composition.Piezoelectric transducer is one of main sensors that is used for ergometry, acceleration/accel, impact, vibration, and it can have voltage and two kinds of outputs of electric charge, and its follow-up amplifying circuit correspondingly is divided into voltage gain and electric charge amplifies two kinds; The present invention is owing to place sensor internal with end instr and signal conditioning circuit, and being connected between piezoelectric element and the circuit is extremely short, so employing voltage gain mode.Fig. 3 is sensor embodiment schematic circuit diagram of the present invention, wherein, Fig. 3 (a) is a voltage output type vibration temperature integrated transducer, and Fig. 3 (b) is a current-output type vibration temperature integrated transducer, should adopt the current-output type sensor of Fig. 3 (b) to condition monitoring for Train Wheel.Two kinds of sensors are by piezoelectric acceleration sensor YDP (measurement range: 0.1～199.9m/s
2), 1-wire digital temperature sensor IC2 (measurement range :-55 ℃～+ 125 ℃), integrated single supply instrument amplifier IC1 and resistance capacitance form.Particularly the current-output type sensor of Fig. 2 (b) picks up the measuring point temperature signal by digital temperature sensor IC2, directly is converted to digital signal DQ transmission; Vibration signal is picked up by piezoelectric acceleration sensor YDP, and the accurate current source that constitutes through IC1, IC3 and resistance R 1, R2 is converted to electric current with the output voltage of IC1 and flows out to load and get on; R2 is a transfer resistance among the figure, and amplifier IC3 cushions to keep good CMR the IC1 reference edge.
The intelligent data acquisition device is core of the present invention, and it is made up of sensor input interface and channel selection circuit, current/voltage-converted circuit, coupled modes selection circuit, program control filtering circuit, integration selection circuit, envelope demodulation circuit, anti-aliasing filtering and anti-resonance circuit, auto-scaling amplifying circuit, CPU and peripheral circuit, CAN interface circuit and power circuit etc.Sensor input interface and channel selection circuit are as shown in Figure 4, the multi-channel data selector of being realized by Connector Clip, multiway analog switch and complex logic programming device (hereinafter to be referred as CPLD) constitutes, wherein the multiway analog switch analog vibration signal that is used to switch required sensor output send the current/voltage-converted circuit, and multi-channel data selector is used to select the temperature signal of respective sensor directly to send CPU sampling.Whether Fig. 5 is the current/voltage-converted schematic circuit diagram, adopts special differential input current voltage transitions mode, is made of three amplifiers and resistance, selected to drop under the control of CPLD by the alternative analog switch, to adapt to electric current, two kinds of input modes of voltage; Adopted the balanced, symmetrical structure, two single-ended received current voltage conversion circuits (IC6C and R6, IC6D and R5) are together in series relatively, two inverting inputs are respectively as the positive and negative terminal of differential input, two mouths join with the positive-negative input end of subtracter IC6A respectively, the in-phase end of amplifier IC6C and IC6D is connected together and connects with reference to ground, makes them can obtain the injection bias current from ground; Subtracter IC6A can make the differential mode voltage of IC6C, IC6D output amplify, and passes the common-mode voltage of coming (comprising interference on the lead-in wire and the imbalance of IC6C, IC6D) from IC6C, IC6D and is inhibited.Under the situation of circuit symmetrical, make R5=R6=R
f, R9=R10=R
j, R7=R8=R
q, the open-loop voltage gain A of amplifier IC6C, IC6D
VO1=A
VO2=A
VO, the output voltage V among Fig. 5
OWith the relation of tested electric current can be by following relationship description: V
O1=-R
fI
i, V
O2=R
fI
i, V
O=(V
O2-V
O1) R
q/ R
j=2I
iR
fR
q/ R
j, the electric current and voltage gain A of circuit
Vi=2R
fR
q/ R
j, input impedance R
i=2R
f/ A
VOIn the formula, A
VO＞＞l, R
i＜＜1, transfer resistance R
fValue be electric current and voltage gain, be exactly that its input impedance is little to the basic demand of current-to-voltage converting circuit, to reduce influence to the measured signal source; Low like this input impedance and the gain of high electric current and voltage are favourable to conversion.In order to improve the sensitivity of conversion, strengthen the transfer resistance R in the current-to-voltage converting circuit
fBe necessary; But in traditional current-to-voltage converting circuit, this will cause the imbalance of circuit to increase, and antijamming capability descends; And in this differential input current voltage conversion circuit, imbalance and interference have been suppressed effectively, therefore strengthen transfer resistance R
fBe feasible.As seen, differential input current voltage conversion circuit of the present invention has advantages such as high gain, high precision, low input impedance, low imbalance and disturbance rejection are strong.
Fig. 6 is that coupled modes of the present invention are selected and the program control filtering schematic circuit diagram, coupled modes have interchange, two kinds of direct currents optional, through the 0.5Hz high-pass filter of amplifier and resistance capacitance formation, directly be communicated with during DC coupling during ac coupling, select 1 analog switch IC21 to select by 2.The program control filtering circuit selects 1 analog switch IC10, CPLD and resistance capacitance to form by virtual earth producer IC11, the two second order universal switch electric capacity active filter IC9,4 of numerical control; Can realize under the control of CPU and CPLD that various bands are logical, low pass, high pass, trap and all-pass wave filtering configuration, central frequency f
o(0.4Hz～57KHz, 64 grades adjustable), quality factor q (128 grades adjustable) are at flex point place decay 5%, rate of decay 24dB/oct; Select 1 analog switch IC10 series connection to constitute a quadravalence universal switch electric capacity active filter by 4 two second order filters in the IC9 among the present invention, the envelope demodulation circuit of also utilizing two second order filters in the IC9 and back is used for the impact signal of reliable extraction monitoring component under the complicated harsh environment to realize program control electric resonance demodulation.
Usually the parameter of research vibration has frequency f, displacement s, speed v, acceleration/accel a etc., and acceleration/accel is a speed rate over time, and speed is displacement rate over time, so have:
Therefore, what no matter study is displacement, speed, or acceleration/accel, and the form and the cycle of its vibration always remain unchanged, 90 ° of phase angles of the leading displacement of speed, and the leading 90 ° of phase angles of speed of acceleration/accel.The present invention after the integration of Fig. 7 is selected circuit, can adopt peak value S by the vibration acceleration signal of sensor extraction measurand
The peak, V
The peak, A
The peakAs the characteristic quantity of describing magnitude of vibrations.Integration selects circuit to be made of two integral elements and analog switch, and 90 ° of phase angles of each integral element hysteresis are made up of amplifier and resistance capacitance.
When local damage appears in a certain piece surface of mechanical equipment, in the carrying operational process, to clash into interactional with it other element surface, produce shock pulse power, because the frequency band of shock pulse power is very wide, must comprise this part, other adjacent part, sensor even additional resonator (can be mechanical, also can be) etc. natural frequency and evoke many high frequency characteristic oscillations, can select a certain high frequency characteristic oscillation as research object according to actual conditions, the bandpass filter that equals this natural frequency by central frequency be separated this characteristic oscillation; By the envelope detector detection, remove the frequency content of high frequency attenuation vibration then, only comprised the low frequency envelope signal of fault characteristic information.Fig. 8 is the envelope demodulation circuit schematic diagram, and it comprises envelope detection and LPF two parts; Envelope detection circuit is by amplifier IC12B, IC12C, and diode D4, D5 and resistance capacitance are formed, and its output voltage equals the absolute value of input voltage, i.e. V
o=| V
i|; LPF is a baud Butterworth second order active low-pass filter, is made up of amplifier IC12D and resistance capacitance, makes R20=R21=R, then cutoff frequency
Rate of decay 12dB/oct; 2 select 1 analog switch to be used to switch the input of envelope demodulation circuit or withdraw from.The present invention utilizes two second-order bandpass filters in the IC9 to cooperate with envelope demodulation circuit, both can realize depending on the resonance and demodulation of a certain mechanical component, also can realize depending on the program control resonance and demodulation of electric resonance, this is very favourable for the extraction of extracting complex structure, mechanical equipment fault information that interfering signal is numerous and diverse.
Anti alias filter is an important components in the hardware system of signal conditioning, requirement according to signal content, the cutoff frequency scope of anti alias filter is controlled at 10Hz～20kHz, in order to improve the frequency resolution of signal, require the bandwidth of anti alias filter adjustable by 1,2,4,5 times of principle of taking advantage of; If adopt that general simulation low-pass filter is must circuit complicated, gear shift is inconvenient, volume too greatly, very practical, the present invention selects the oval low-pass filter IC13 of 8 rank switching capacities to make anti alias filter, as shown in Figure 9.Integrated switched capacitor filter volume is little, exponent number is high, the decay edge is steep, it is very convenient to change pass band width, but itself has switching noise, especially has " resonance " phenomenon; Therefore in use, take measures necessary according to different requirements.The present invention utilizes aforesaid programmable filter IC9 that frequency input signal is controlled under the switching capacity filter sampling frequency, with independently op amp and resistance capacitance constitute the second-order low-pass filter that cutoff frequency is 20KHz in the IC13 sheet, in order to leach the switching frequency of IC9, be connected to a programmable analog low-pass filter that constitutes by amplifier and resistance capacitance behind the IC13 filter; Avoid " resonance " phenomenon effectively and eliminate the caused noise of sampling frequency signal.
CPU of the present invention adopts the micro controller system IC2 of embedded 10 A/D converters, this A/D converter is difficult to satisfy the requirement that equipment condition monitoring is used intermediate-resolution, and external high-resolution A/D converter not only makes cost obviously improve, and makes interface circuit more complicated; For this reason, the present invention brings up to 14 bit resolutions by the method for auto-scaling amplification, CPLD hardware Direct Sampling and raising sampling frequency with 10 A/D in the IC2 sheet, has improved the ratio of performance to price of scm application system.Auto-scaling amplification of the present invention and A/D change-over circuit schematic diagram are as shown in figure 10, the precision resistance of 8 equivalences is divided into 8 grades with 0～5V reference voltage, every grade of scope is 0.625V, 8 taps connect eight respectively and select 8 input ends of an analog switch IC18 and the inverting input of 7 comparators (amplifier IC16, IC17 constitute), by outgoing level encoded control IC18 channel selecting end C, B, the A of CPLD, select a partial pressure value through the inverting input of follower (IC17A amplifier) to the accurate differential amplifier of IC22A (Av=8) according to 7 comparators.As input voltage Vi is 3V, then the digital quantity of 7 comparator outputs is 0001111, output to IC18 channel selecting control end C through CPLD decoding, B, the digital quantity of A is 100, choosing the 2.5V partial pressure value send IC22A to carry out the difference amplification through follower, adjust the value of resistance R 58～R60, making magnification factor is 8 times, then amplifier IC22A output Vo=8 * (Vi-2.5)=8 * (3-2.5)=4.0V, select the AD0 passage of CPU to carry out the A/D conversion, the result is 1100110010,13 A/D transformation results that Here it is low 10, passage control code 100 is the high 3 of 13 A/D conversions, obtain 14 bit resolutions and do 2 13 A/D conversion by CPU and realize, doing so not exclusively is in order to improve the resolution of A/D conversion, and mainly is in order effectively to reduce the influence to measuring of randol noise and pulse jamming.
The CAN of controller local area network is a kind of total digitalization, the beidirectional fieldbus of advocating peace more; CAN bus of the present invention is 4 line systems cable power supply modes altogether, and signal wire (SW) adopts high-speed photoelectric coupler to isolate.Figure 11 is CAN field-bus interface and power circuit principle figure, and the CAN interface circuit is made of the built-in CAN communication controller of IC2, CAN bus transceiver IC1 and high-speed photoelectric coupler IC19, IC20; Meet the ISO11898 standard fully, bus transfer rate reaches as high as 1Mbit/s, transmission distance can reach 10Km farthest, electromagnetic radiation (EME) is very low, the differential receiver of wide common mode range can anti-electromagnetic interference (EMI), at least can connect 110 nodes on the bus, be in not that the transceiver of power-up state is equivalent to zero load, have bus and wake (long-range) function up.In order to strengthen the antijamming capability of this sensor groups, isolate bus transceiver IC1 and communication controller IC2 by high-speed photoelectric coupler, realized the electrical isolation of each node on the bus; Two power supply POWER2 and POWER3 that optocoupler part is adopted must isolate fully, otherwise adopt optocoupler also just to lose meaning; Though this has increased the complexity of node, but improved the stability and the safety of node; Certain safety and interference protection measure have also been adopted in the interface section of IC1 and CAN bus, and two little electric capacity in parallel (C6, C7) between CANH and CANL and the ground can play the radio-frequency interference on the filtering bus and the ability of certain anti-electromagnetic radiation; Between two CAN bus incoming ends and ground respectively reversal connection a protection diode (D1, D2), when the CAN bus has higher negative voltage, can play certain overvoltage protection effect by the short circuit of diode.The present invention adopts common cable network power supply technology, (isolation voltage 〉=1000VDC) the single output type DC of voltage stabilizing-DC microswitch power module, diode D3, capacitor C 1, C5 form power unit by three wide voltage input isolation, diode D3 is used to prevent error-polarity connection, three isolated form DC-DC microswitch power modules are supplied with the power supply of numerical portion, simulation partial sum communications portion respectively, can effectively suppress to disturb the stability and the safety that have improved node.
In sum, bus type condition monitoring intelligent transducer group of the present invention integrates multisensor many reference amounts data fusion, signal condition, intelligent data acquisition, on-scene communication network, adopts cable network power supply technology altogether; Sensor groups is under the control of CPU and CPLD embedded software, after finishing current/voltage-converted, coupling, program control filtering, integration, envelope demodulation, anti-aliasing filtering, auto-scaling amplification etc. that each sensor is picked up information and handling, carry out D/A switch and transformation result is kept among the RAM, CPU is spread out of take off data when upper condition monitoring and fault diagnosis main frame needs by the CAN fieldbus; When bus was idle, circuit had observed reading and keeps automatically, the function that time-delay enters readiness for action automatically.CAN fieldbus employing high-speed photoelectric coupler is realized the electrical isolation between transceiver and the controller, protects internal circuit reliably, avoids external disturbance.Multiple useful signal processing methods such as sensor groups integrated use current/voltage-converted of the present invention, coupling, program control filtering, integration, envelope demodulation, anti-aliasing filtering, auto-scaling amplification, can extract the status information such as vibration, impact, temperature, speed of equipment under test, very suitable to the comprehensive accurate diagnosis that carries out many reference amounts, many standards, have unique advantage aspect equipment condition monitoring under the occasions such as complex structure, work under bad environment, interfering signal be numerous and diverse and the trouble diagnosing solving.
Though the preferred embodiments of the present invention are described in detail and illustrate, the present invention should only not be confined to the foregoing description.Should be known in that those skilled in the art can carry out numerous modifications and variations under the condition that does not deviate from spirit of the present invention and principle, and do not break away from of the present invention by protection domain that claims limited.
Claims (4)
1. bus type intelligent sensor groups that is used for condition monitoring and fault diagnosis, it comprises a plurality of combination sensors, an intelligent data acquisition device and isolated form CAN bus three parts, it is characterized in that, adopt cable network power supply technology altogether, extract running state information nearby by the described a plurality of sensors that are installed in each check point of measurand, after described intelligent data acquisition device is handled and gathered, be sent to upper condition monitoring main frame by described isolated form CAN bus.
2. according to the described intelligent transducer group of claim 1, it is characterized in that, described combination sensor comprises piezoelectric acceleration sensor YDP, 1-wire digital temperature sensor IC2 and the signal conditioning circuit of being made up of amplifier and resistance capacitance, has voltage, two kinds of output forms of electric current.
3. according to claim 1 or 2 described intelligent transducer groups, it is characterized in that described intelligent data acquisition device comprises: realize the channel selection circuit that multi-channel data selector is formed by multiway analog switch, CPLD; Compound type differential input current/voltage conversion circuit of forming by amplifier IC6 and resistance; Select and the program control filtering circuit by the coupled modes that 0.5Hz high-pass filter, numerical control universal filter IC9, virtual earth producer IC11, analog switch and CPLD form; Select circuit by the integration that amplifier IC22, analog switch IC21 and resistance capacitance are formed; The envelope demodulation circuit of forming by amplifier IC12, analog switch IC8, diode and resistance capacitance; By the oval low-pass filter IC13 in 8 rank, analog switch IC14, IC15, anti-aliasing filtering and anti-resonance circuit that amplifier IC12A and resistance capacitance are formed; By amplifier IC16, IC17, IC22A and resistance, analog switch IC18, the auto-scaling that embedded A/D converter of CPU and CPLD form amplifies and the A/D change-over circuit; By P8XC591 micro controller system, CPLD, RAM, E
2CPU and peripheral circuit thereof that ROM forms.
4. according to claim 1 or 2 described intelligent transducer groups, it is characterized in that described isolated form CAN bus is by the embedded bus controller IC2 of CPU, CAN bus transceiver IC1, high speed photo coupling IC19, IC20, diode D1, D2 and resistance capacitance are formed, and have common cable network power supply function.
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2004
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