CN1584510A - Modular self-diagnostic detector - Google Patents
Modular self-diagnostic detector Download PDFInfo
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Abstract
A modularized self-diagnosis detector is composed of DSP, A/D converter, front end detecting module, display of man-machine auxiliary interaction and keyboard. It is featured as judging whether itself module is fault or not in addition to real time detection of measured signal, telling out reason, time and position of the fault and switching off relevant circuit.
Description
Technical field
The present invention relates to a kind of modularization self diagnosis series of combination detector based on DSP, this detector has fault self-diagnosis function, with the DSP information processing and be controlled to be core, can carry out modularization and detect temperature, stress, acceleration, the noncontact voltage of combination, the detection of current measurement.
Background technology
The Digital Detecting instrument of physical quantity commonly used is made up of front end analog signal detection circuit, A/D change-over circuit, CPU digital signal processing circuit, auxiliary several major parts of man-machine interface circuit substantially.Because the contents processing of CPU digital signal processing circuit is able to programme, the input and output man-machine interface can be compatible, the real difference of these detecting instruments is the analog signal detection part of front end, and these characteristics provide condition for modular multi-function composite signal detecting instrument.But, because the mechanical robustness of module interface and electric anti-interference are bigger to the influence of combine detection instrument performance, so the mechanical connection manner of interface and electric interference protection measure just become the key technical problem of this generic module combine detection instrument development.The present invention adopts specific long-life machine interface mode, the electric interfaces anti-jamming circuit of autonomous Design, make modular combination detect on the basis that guarantees accuracy of detection, reach the modularization series detecting instrument of plug repeatedly, flexible combination, under the situation that guarantees accuracy of detection, reduced cost, realized multi-functional, highly reliable, volume is little, the conventional physical quantity series of combination of in light weight, high intelligence detects.
General detecting instrument does not possess fault self-diagnosis function, can only judge the state of instrument work by the accuracy that detects data, often only when apparent error appears in testing result, could find that fault has appearred in instrument, but, the position that fault occurs, time all can't know, this detects the correctness of data to the user, reliability is a potential adverse effect, if it is not obvious to detect data variation, will make the user think the detection data of mistake by mistake to be correct data, thereby influence user's operate as normal, especially, in the detection occasion of visual plant, these influences that can't see may produce major accident hidden danger.So the functional reliability of detecting instrument itself is crucial.At this problem, the present invention has designed the specific fault point parameter self-detection circuit of different testing circuits, when the circuit parameter of trouble spot breaks down state, the capital is notified automatically from cpu fault position, malfunction, CPU notes down fault-time, place, and analyzing failure cause, provide the method prompting of fixing a breakdown.Therefore, the present invention has higher reliability, accuracy, intelligent, maintainable on the basis of not improving the instrument development cost.
The modularization of practical detecting instrument, low cost, highly reliable be the focus of modern detecting instrument research always, development along with electronic computer technology, the intervention of the system fault self-diagnosis technology of high intelligence will provide new research and development approach to the robotization research of detecting instrument.So modularization self diagnosis combine detection instrument of the present invention has certain theoretical significance and wide practical value.
Summary of the invention
One of purpose of the present invention provides a kind of fault self-diagnosis function that has, with the DSP signal Processing and be controlled to be core, the programmable series of combination detecting instrument of modularization.Can distinguish or detection simultaneously or monitor temperature, stress, acceleration, voltage, five physical quantitys of electric current.Belong to a kind of multiple measurement utensil.
Another object of the present invention is to adopt hardware circuit that the method for trouble spot is set, and realizes the monitoring of the fault of testing circuit.Adopt the method for pattern-recognition, fault is carried out Classification and Identification, warning, propose arrange distinguish method and solution.Adopt the anti-measure of hardware and software, guarantee the accuracy that detects.
The present invention utilizes conventional interface to realize the modular construction of detecting instrument.Tool interface system is simple, and is easy to use, and volume is little, in light weight, and plug does not continuously influence the result of use of instrument.And modular construction detecting instrument at present commonly used substantially all is that to adopt with PC be core, connects by PC main board bus interface, uses inconveniently, and modular functionality is outstanding.The present invention can address these problems well.
The present invention utilizes the setting of specific fault point in the testing circuit, makes system can finish automatic trouble diagnosis, and the processing of in time reporting to the police, prompting method for removing information.And detecting instrument commonly used does not at present possess this function, can't inform the user when breaking down in feasible the use, and this also is a FAQs of measuring instrument reliability commonly used.The present invention can address this problem preferably by the hardware setting and the software algorithm of circuit.
Description of drawings
Fig. 1 is a general structure block diagram of the present invention.
Fig. 2 is a mode of operation structural representation of the present invention.
Fig. 3 is a self check FB(flow block) of the present invention.
Fig. 4 is that fault of the present invention is interrupted decision box.
Fig. 5 is an anti-interference structure synoptic diagram of the present invention.
Fig. 6 is the circuit theory diagrams of DSP.
Fig. 7 is storer, AD interface module circuit theory diagrams.
Fig. 8 is the interface section schematic diagram.
Fig. 9 is the AD circuit theory diagrams.
Embodiment
A kind of modularization self diagnosis combine detection instrument of the present invention, comprise DSP, A/D converter, and the self-diagnosis of trouble circuit that the front-end detection module is carried out fault self-diagnosis, front-end detection module (temperature sensing circuit, the stress testing circuit, the acceleration detection circuit, the noncontact voltage detecting circuit, the noncontact current detection circuit, the A/D change-over circuit), display, keyboard, electric power management circuit, display, keyboard, electric power management circuit is connected with DSP, A/D converter is realized being connected with the serial ports J4 of DSP by interface J11, and the front-end detection module is by AD interface J12, J13, J14 is connected with A/D converter.
Described CPU can adopt the TMS320C5402 DSP chip, and its each terminal connection is described below: (seeing also shown in Figure 6)
The TMS320C5402 DSP chip has 144 terminals,
The power input 4,33,56,75,112,130 of DSP connects+the 3.3V power supply,
The power input 12,16,52,68,91,125,142 of DSP connects+the 1.8V power supply,
The corresponding respectively address end 24,25,26,27,28,29,30,31,32,35,36,37,38,39,40,41 that connects program storage U8 of 16 address output ends 131,132,133,134,136,137,138,139,140,141,5,7,8,9,10,11 of DSP; The also corresponding respectively address end 5,4,3,2,1,44,43,42,27,26,25,24,21,20,19,18 that connects data-carrier store U9,
The corresponding respectively data terminal 21,20,19,18,17,16,15,14,11,10,9,8,7,6,5,4 that connects program storage U8 of 16 data output ends 99,100,101,102,103,104,113,114,115,116,117,118,119,121,122,123 of DSP; The also corresponding respectively data terminal 7,8,9,10,13,14,15,16,29,30,31,32,35,36,37,38 that connects data-carrier store U9, the power input 44 of its program storage U8 connects+the 3.3V power supply; The power input 11,33 of data-carrier store U9 connects+the 3.3V power supply; Ground input end 12,34 ground connection of program storage U8; Ground input end 12,34,39,40 ground connection of data-carrier store U9,
The program gating end 20 of DSP connects the gating end 3 of program storage U8, and data strobe end 21 connects the gating end 6 of data-carrier store U9, and storer control signal output ends 19,22 connects 23,5 ends of J1,
The read/write gating end 23 of DSP connects the read/write end 43 of program storage U8, the read/write end 17 that also connects data-carrier store U9, the input end 9 of connection not gate U7A, the output terminal 8 of not gate U7A connects the gating end 22 of program storages, the output terminal 8 of not gate U7A also connects the gating end 41 of data-carrier store
8 host interface pins, 58,69,81,95,120,124,135,6 ends of DSP are 10,22,9,21,8,20,7,19 ends of corresponding joining interface J2 respectively,
Corresponding respectively 8,7,6 ends that connect toggle switch S2 of the clock module end 77,78,79 of DSP,
10 ends of the HPI pattern gating 92 termination switch S 2 of DSP;
The interrupt response of DSP is exported 4 ends of 61 termination J1, corresponding respectively 6 ends that connect 27,8,26 and the J2 of J1 of external interrupt input end 64,65,66,67, and maskable interrupting input end 63 does not connect 1 end of switch S 5,
The reset terminal 98 of DSP connects reset circuit,
The microprocessor of DSP/microcomputer model selection 32 ends connect 9 ends of switch S 2,
Corresponding respectively 22,3 ends of J1 and 2,3 ends of P2 of connecting of multiprocessing technology end signal 27,31 ends of DSP, signal 27 ends also connect 6 ends of J3 and J4 respectively,
Oscillator/timer signal 96,97 ends of DSP connect external crystal-controlled oscillation,
Clock signal 82 ends of DSP connect 1 end of P2,
Corresponding respectively 9,4,8,3,7,2 ends that connect J4 of signal 42,44,47,49,54,60 ends of the serial ports 1 of DSP,
Corresponding respectively 9,4,8,3,7,2 ends that connect J3 of signal 41,43,45,48,53,59 ends of the serial ports 0 of DSP,
13,19,30,31,64,65,66,67 ends of DSP meet power supply+3.3V by a 10K resistance respectively.
A/D conversion line relation of the present invention: (seeing also shown in Figure 9)
The chip that the A/D plate adopts is MAX147, and it is with 20 terminals, and the connecting mode of each terminal is as follows:
1,2,3,4,5,6,7,8 ends of MAX147 connect simulation ground after connecting 0.01uF electric capacity respectively, 9,13 connect simulation ground, 14 terminations digitally, 11 ends connect by connecing simulation ground after the capacitor C 1,11 ends connect with 8 ends of voltage stabilizing chip U2 simultaneously, 11 ends connect with 12 ends behind the connecting resistance R2 simultaneously, 12 ends connect with 20 ends, meet 3.3V behind the 20 terminating resistor R1,20 ends connect (20 pin connect+), the 4 terminations simulation ground of U2 simultaneously respectively with by 0.1uF polarity free capacitor C4 and 1uF polar capacitor C5 with simulation ground.
Below hardware circuit design of the present invention is described:
(1) cpu chip is selected
Microcomputer chip is as the core of intelligence instrument, and its selection will determine the general structure of instrument.The DSP DSP chip is to be designed to a kind of microprocessor that is particularly suitable for carrying out digital signal processing.DSP not only is greatly improved on arithmetic speed, and greatly improvement is being arranged aspect versatility and the dirigibility.In addition, the cost of dsp chip, volume, weight and power consumption have also all had decline significantly.The design selects the TMS320VC5402 dsp chip in American TI Company fixed-point arithmetic 54 series, and its peak value arithmetic speed when the 100MHz clock can reach 100MIPS.The effect of DSP mainly is the control instrument integrated mode, with the sample frequency of each detection module of control, will handle accordingly by the detection data that the A/D module converts obtains, and then, delivers to LCD and shows that detection can be carried out in real time.Simultaneously, the fault look-at-me that transmits on each check-out console of the interrupt response of DSP, by the Fault Identification algorithm, the position of failure judgement, type provide malfunction elimination measure prompting on LCD.
(2) temperature sensor is selected (temperature detecting module)
The acp chip of temperature sensor is chosen AD595.This sensor is that K type thermopair is as front end temperature signal crossover tool, AD595 can have better linearityization to K type thermopair, higher to variation of temperature sensitivity, carry cold junction compensation circuit and excess current warning circuit, and temperature-measuring range wide (200 ℃～1200 ℃).
(3) strain gauge is selected (stress detection module)
Stress detects and has adopted the more intense foil gauge of independence, the gauger not only can be according to actual conditions, as the foil gauge of selection different parameters such as the frequency of strain variation, the direction of testing gravitation and size, even the comparison that can select different change to measure.Simultaneously, adopt the foil gauge gauger also can independently introduce suitable temperature compensation, to satisfy the requirement of measuring accuracy according to actual conditions.
(4) acceleration transducer is selected (acceleration detection module)
In vibration survey, become tested vibration mechanics Parameters Transformation the device of electrical parameter to call vibration measurement sensor.When using electrical measuring method to come measuring vibrations displacement, speed and acceleration, because three parameters can be changed mutually, the composition of vialog has different forms according to the difference of used sensor, so vialog mainly is to design according to certain sensor.In the vibration survey the most frequently used to sensor be displacement, speed and acceleration transducer.Acceleration transducer can be done to such an extent that the size of specific rate sensor is little, in light weight usually, and the frequency of operation broad.When measuring, not only sensor is little to the influence (additional mass) of test specimen vibration characteristics, and measured result is also more near certain point, rather than the vibration of certain face, can better adapt to the requirement of vibration frequency simultaneously.Because the output impedance higher (more than the 10M Ω) of piezoelectric acceleration transducer, so when connecting with amplifier, middle must the coupling through impedance conversion.When using impedance conversion, wish closely, to avoid the loss of signal energy from acceleration transducer.Between impedance conversion and vialog, as connect an amplifier, can improve the sensitivity of measurement.Therefore, sensor is selected sensor that prime amplifier and piezoelectric acceleration transducer are made of one among the design, and it is easy to use, dependable performance, strong interference immunity.
(5) noncontact voltage, current sensor are selected (voltage, current detection module)
Noncontact voltage, current sensor have adopted Hall element to carry out the magnetoelectricity conversion, thereby check point and test side are carried out electrical isolation.Because the withstand voltage height of Hall element is easy to use, so the present invention has adopted Hall element to carry out big electric current, high-tension non-cpntact measurement.
(6) Interface design of A/D converter and DSP
The interface J4 of DSP core board links by the interface J10 of 9 needle interfaces and A/D plate U10; (the concrete parameter of the corresponding interface is referring to A/D plate and DSP core board).Here, entry signal is interrupted in the trouble spot that has also connected each front-end detection module on the A/D plate, according to the fault signature state of trouble spot level is arranged in interruption and is interrupted form or pulse-break form.See also shown in Figure 7.
Please, mend the interrupt circuit that connects into the A/D plate? according to the selection of mode of operation shown in Figure 2
(7) Interface design of temperature sensing circuit and A/D plate
Does the J12 interface of A/D plate link by the interface J1 of 15 needle interfaces and temperature detection plate? The trouble spot of temperature plate has three: if 1. 1 of AD595,14 contact with thermopair bad, the electric voltage exception of 8,9 pin that can lead system AD595, if abnormal voltage will produce a down trigger level, its interrupt number is #11INT; Be normal when 2. 2 of S2,3 pin are connected, in the time of 1,4 connections, the potential value that the output voltage values of OUT1 is exported by electric bridge vises and does not change.At this moment, produce a down trigger level, its interrupt number is #12INT; 3. the maximum of the MAX492 of U6 permission output current is 30 milliamperes, cause chip hot when electric current is excessive, because U6? the output load of voltage follower is the electric bridge in 100 Europe, thus to control the input of voltage, in case chip is hot.Therefore, when output current surpasses 30mA, will produce a down trigger level, its interrupt number is #13INT.
(8) Interface design of stress testing circuit and A/D plate
The J14 interface of A/D plate links by the interface J1 of 15 needle interfaces and stress check-out console; The trouble spot of stress plate has one: in the sliding resistance change process of constant current source part, if the too small meeting of resistance causes the change of triode duty, make it break away from magnifying state, at this moment, the base voltage of triode can not be stabilized in 2.5V.Therefore, add a trouble spot, up-set condition will produce a down trigger level, and its interrupt number is #21INT.
(9) the acceleration detection circuit and with the Interface design of A/D plate
The J14 interface of A/D plate links by the interface J1 of 15 needle interfaces and acceleration detection plate.The trouble spot of acceleration plate has 2, if 1. the reference voltage of the input end in the same way of single supply amplifier is too high or too low, accuracy of detection is affected, therefore, the level detection point is set, and up-set condition will produce a down trigger level, and its interrupt number is #31INT; 2. the programmable amplifier conversion is unreliable, and mistake will appear in the judgement of software, therefore, the level detection point is set, and up-set condition will produce a down trigger level, and its interrupt number is #32INT.
(10) voltage, current detection circuit and with the Interface design of A/D plate
The J13 interface of A/D plate links by the interface J1 of 15 needle interfaces and voltage, current detecting plate.A trouble spot is arranged on the voltage plate: only work in the linearity range of Hall element, could guarantee the correctness of testing result, therefore, the level detection point is set, up-set condition will produce a down trigger level, and its interrupt number is #41INT.
A trouble spot is arranged on the electric current plate: only work in the linearity range of Hall element, could guarantee the correctness of testing result, therefore, the level detection point is set, up-set condition will produce a down trigger level, and its interrupt number is #51INT.See also shown in Figure 4.
In the present invention, self diagnosis is provided with eight faults altogether and interrupts, and DSP has only 4 external interrupt, therefore, adopts and interrupts expanded circuit, as shown in Figure 7.
Connect the #32INT port of acceleration detection module behind the input 2 terminating resistor R3 of impact damper U4, the #13INT port of jointing temp detection module behind the 4 terminating resistor R4, jointing temp detection module #12INT behind the 6 terminating resistor R5, connect the #51INT port of voltage detection module behind the 8 terminating resistor R6, connect the #41INT port of current detection module behind the 17 terminating resistor R7, connect the #31INT port of acceleration detection module behind the 15 terminating resistor R8, scoop out the #21INT port of power detection module behind the 13 terminating resistor R9, the #11INT port of jointing temp detection module behind the 11 terminating resistor R10, these look-at-mes are respectively by behind the impact damper U4, from 18,16,14,12,3,5,7, code translator U5 is exported in the output of 9 ends.The 16 termination 3.3V voltages of U5,69 ends of the U1 of 9 termination DSP, 81 ends of 7 termination U1,95 ends of 6 termination U1,8 end ground connection.
In the present invention, detector can realize that single mode of operation detects, and also can realize 2,3 or the detection of multinomial mode of operation.Detector makes up according to 5 modules that the front-end detection module provides, can be combined into 6 classes and measure the detector of different pieces of information, the selection of mode of operation realizes by the keyboard input, and show state window and associative operation explanation on display, and its mode of operation process flow diagram sees also shown in Figure 2.
Among the figure, wait for the input service model selection of keyboard by the DSP inquiry, if mode of operation 1 changes single temperature detection pattern over to, the start-up temperature detection module, and detected temperatures value, DSP will obtain detected value by A/D conversion, and noise removing, numerical evaluation scheduling algorithm are handled detection signal, obtain testing result then and its result is shown on the LCD.Judge to have or not stop key to press, have, then stop detecting; Do not have, then continue circulating working mode and judge.In like manner can get, can detect the detection of stress, acceleration, noncontact voltage, noncontact electric current.
Under the work in combination pattern, can start a plurality of detection modules simultaneously, adopt the method for time-division processing to obtain detected value between each module, and carry out processes and displays respectively on display.
In the present invention, in order to solve the signal jamming performance problem in the front-end detection module, being provided with electrical interface circuits on each detection module output terminal comes anti-interference, make the detecting instrument of modular combination guarantee on the basis of accuracy of detection, reach plug repeatedly, flexible combination, guaranteeing to have reduced cost under the situation of accuracy of detection, realized multi-functional, highly reliable, volume is little, conventional physical quantity series of combination in light weight, high intelligence detects.(seeing also shown in Figure 5)
In order to improve the interference free performance of total system, designer of the present invention has designed that unification+5V power supply imports that each modular power source is isolated and the scheme of self electric pressure management.By external power source provide+5V voltage is to each module, the Power Management Unit of each module provides self circuits needed different electric pressures according to detecting needs, make the interference mode that can not produce the power supply interlinkage between each module, thereby improve the whole antijamming capability of system.
Detector of the present invention after tested, its fault detects accuracy 98% automatically; Temperature detecting precision: ± 5%; Stress accuracy of detection: ± 5%; Acceleration detection precision: ± 5%; Voltage detecting precision: ± 5%; Current detection accuracy: ± 5%.
Claims (10)
1, a kind of modularization self diagnosis detector based on DSP, comprise display, keyboard, electric power management circuit, CPU, AD converter and front-end detection module, the front-end detection module is made of temperature detecting module, stress detection module, acceleration detection module, noncontact voltage detection module, current detection module, it is characterized in that:
Described CPU is a dsp processor, and is furnished with program storage and data-carrier store;
Described A/D converter is provided with on the interface circuit of A/D converter and is furnished with the self-diagnosis of trouble circuit and connects with it;
Described electric power management circuit also comprises anti-interference interface circuit, and electric power management circuit provides power supply for DSP, AD converter, display, keyboard, simultaneously output+5V and-5V voltage is respectively to the front-end detection module;
DSP is connected by serial ports with A/D converter, and A/D converter links to each other respectively with the front-end detection module by its interface circuit that is provided with, and electric power management circuit, display circuit, keyboard circuit link to each other with the DSP circuit respectively.
2, self diagnosis detector according to claim 1, it is characterized in that: DSP chooses the TMS320VC5402 chip, AD converter is chosen the MAX147 chip, program storage is chosen the AT29LV1024 chip, data-carrier store is chosen the CY7C1021V33 chip, interrupts expansion and chooses 74LCX240,74HC148,74HC30 chip.
3, according to claim 1,2 described self diagnosis detectors, it is characterized in that: 16 address outputs 131 of dsp processor U1,132,133,134,136,137,138,139,140,141,5,7,8,9,10,11 ends connect the address 24 of program storage U8 respectively, 25,26,27,28,29,30,31,32,35,36,37,38,39,40,41 ends, the also corresponding respectively address 5 that meets data-carrier store U9,4,3,2,1,44,43,42,27,26,25,24,21,20,19,18 ends, 16 data outputs 99 of U1,100,101,102,103,104,113,114,115,116,117,118,119,121,122,123 ends connect the data 21 of program storage U8 respectively, 20,19,18,17,16,15,14,11,10,9,8,7,6,5,4 ends, also connect the data 7 of data-carrier store U9 respectively, 8,9,10,13,14,15,16,29,30,31,32,35,36,37,38 ends, the power supply of its program storage U8 is imported 44 terminations+3.3V power supply; The power supply input 11 of data-carrier store U9,33 terminations+3.3V power supply, gating 3 ends of the program gating 20 termination program storage U8 of U1, gating 6 ends of the data strobe 21 termination data-carrier store U9 of U1, the storer control signal output 19 of U1,23 of 22 termination J1,5 ends, 43 ends of the read/write gating 23 termination program storage U8 of U1, connect 17 ends of data-carrier store U9, connect input 9 ends of not gate U7A, output 8 ends of not gate U7A connect gating 22 ends of program storage U8, output 8 ends of not gate U7A also connect gating 41 ends of data-carrier store U9,8 host interface pins 58 of U1,69,81,95,120,124,135,10 of 6 ends difference connection interface J2,22,9,21,8,20,7,19 ends, the clock module 77 of U1,78, corresponding respectively 8 of the toggle switch S2 that connects of 79 ends, 7,6 ends, the host interface pin 13 of U1,17,18,39,46,51,55,62,127,17 of 129 ends difference connection interface J2,5,18,4,16,15,3,2,1,14 ends, the HPI pattern gating 92 of U1 connects 10 ends of switch S 2, the interrupt response output terminal 61 of U1 connects 4 ends of J1, external interrupt input end 64,65,66,67 corresponding respectively 27 of the J1 that connect, 8,26 and 6 ends of J2, maskable interrupting input end 63 does not connect 1 end of switch S 5, the reset terminal 98 of U1 connects reset circuit, the microprocessor of U1/microcomputer model selection 32 ends connect 9 ends of switch S 2, the multiprocessing technology end signal 27 of U1, corresponding respectively 22 of the J1 that connects of 31 ends, 2 of 3 ends and P2,3 ends, signal 27 ends also connect 6 ends of J3 and J4 respectively, oscillator/timer signal 96 of U1,97 termination external crystal-controlled oscillation, clock signal 82 ends of U1 connect 1 end of P2, the signal 42 of the serial ports 1 of U1,44,47,49,54,60 ends meet 9 of J4 respectively, 4,8,3,7,2 ends, the signal 41 of the serial ports 0 of U1,43,45,48,53,59 ends meet 9 of J3 respectively, 4,8,3,7,2 ends, 13 of U1,19,30,31,64,65,66,67 ends meet power supply+3.3V by a 10K resistance respectively; 1,2,3,4,5,6,7,8 ends of A/D converter U10 connect simulation ground after meeting 0.01uF capacitor C 6～C13 respectively, 9,13 terminations simulation ground, 14 terminations digitally, connect simulation ground behind the 11 termination capacitor C1,11 ends connect with 8 ends of voltage stabilizing chip U2 simultaneously, and 11 ends connect with 12 ends behind the connecting resistance R2 simultaneously, 12 ends connect with 20 ends, meet 3.3V behind the 20 terminating resistor R1,20 ends connect the back respectively and connect with simulation ground with polarity free capacitor C4 and polar capacitor C5, the 4 terminations simulation ground of U2.
4, self diagnosis detector according to claim 1 is characterized in that: the setting of described self-diagnosis of trouble deenergizing is the information of gathering each detection module, by the mode of carrying out fault diagnosis of interrupting and the A/D collection combines.
5, self diagnosis combine detection instrument according to claim 1, it is characterized in that: self-diagnosis of trouble is arranged to output level look-at-me form with the fault signature state of front end detection module trouble spot.
6, self diagnosis detector according to claim 1 is characterized in that: anti-interference interface circuit, the power supply between each module is anti-interference.
7, self diagnosis detector according to claim 1 is characterized in that: the concentrated fault performance that the reflection testing circuit is set of position of failure point.
8, self diagnosis detector according to claim 1 is characterized in that: the isolation between failure detector circuit and the normal circuit adopts emitter follower to make impact damper, makes failure detector circuit not influence the operate as normal of each module.
9, self diagnosis detector according to claim 1 is characterized in that: can realize that single mode of operation detects, and also can realize multinomial work in combination mode detection.
10, self diagnosis detector according to claim 1, it is characterized in that: fault detects accuracy 98% automatically; Temperature detecting precision: ± 5%; Stress accuracy of detection: ± 5%; Acceleration detection precision: ± 5%; Voltage detecting precision: ± 5%; Current detection accuracy: ± 5%.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729578A (en) * | 2013-12-18 | 2015-06-24 | 黄俊铭 | Sensing system having a re-modularized sensing device and initialization method using the same |
| CN106153981A (en) * | 2016-05-24 | 2016-11-23 | 中国人民解放军海军工程大学 | IEPE type intelligence acceleration transducer and method of work thereof |
| CN111665408A (en) * | 2020-06-16 | 2020-09-15 | 河南里程碑科技有限公司 | High-protection distribution box fault detection method and device |
-
2004
- 2004-06-10 CN CN 200410009197 patent/CN1281929C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729578A (en) * | 2013-12-18 | 2015-06-24 | 黄俊铭 | Sensing system having a re-modularized sensing device and initialization method using the same |
| CN106153981A (en) * | 2016-05-24 | 2016-11-23 | 中国人民解放军海军工程大学 | IEPE type intelligence acceleration transducer and method of work thereof |
| CN106153981B (en) * | 2016-05-24 | 2022-09-27 | 中国人民解放军海军工程大学 | IEPE type intelligent acceleration sensor and working method thereof |
| CN111665408A (en) * | 2020-06-16 | 2020-09-15 | 河南里程碑科技有限公司 | High-protection distribution box fault detection method and device |
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| CN1281929C (en) | 2006-10-25 |
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