CN202304869U - Fault diagnosis circuit of transducer - Google Patents

Fault diagnosis circuit of transducer Download PDF

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Publication number
CN202304869U
CN202304869U CN 201120348775 CN201120348775U CN202304869U CN 202304869 U CN202304869 U CN 202304869U CN 201120348775 CN201120348775 CN 201120348775 CN 201120348775 U CN201120348775 U CN 201120348775U CN 202304869 U CN202304869 U CN 202304869U
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CN
China
Prior art keywords
change
processing module
over switch
signal processing
sensor
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Expired - Fee Related
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CN 201120348775
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Chinese (zh)
Inventor
周翔
王汉其
袁庆国
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Sany Heavy Industry Co Ltd
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Sany Heavy Industry Co Ltd
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Priority to CN 201120348775 priority Critical patent/CN202304869U/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
    • G01L27/007—Malfunction diagnosis, i.e. diagnosing a sensor defect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/10—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for switching-in of additional or auxiliary indicators or recorders

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

The utility model relates to a fault diagnosis circuit of a transducer. The fault diagnosis circuit comprises a sensor, a signal processing module, a standard signal input module and a switch, wherein the switch is connected with the sensor and the signal processing module and simultaneously connected with the standard signal input module and the signal processing module. According to the fault diagnosis circuit disclosed by the utility model, a standard signal is input into the signal processing module through the standard signal input module, and the connection between the sensor and the signal processing module and the connection between the standard signal input unit and the signal processing module is switched through the switch. When a fault occurs, the connection between the sensor and the signal processing module is cut off through the switch and changed to the connection between the standard signal input module and the signal processing module, the standard signal is input into the signal processing module through the standard signal input module, the signal processing module is used for processing the standard signal and then outputting the standard signal, and if an output result is normal, the situation indicates that the sensor has the fault. Otherwise, the situation indicates that the signal processing module has the fault. The fault diagnosis circuit disclosed by the utility model has the advantages of simple structure, low cost and convenience in maintenance.

Description

A kind of transmitter fault diagnosis circuit
Technical field
The utility model relates to a kind of transmitter fault diagnosis circuit.
Background technology
Sensor is in scientific research and technological development; Particularly in infotech; Automatic technology in the technology such as modern manufacturing, plays irreplaceable effect; Pressure transducer is the maximum a kind of sensor of present number of applications, is widely used in national defence fields such as industrial circles such as oil, chemical industry and Aeronautics and Astronautics.
Present pressure unit applied more and more, in real work, pressure unit will be damaged or fault owing to receive various Effect of Environmental, causes no-output or signal undesired.Generally speaking; Pressure unit has been broken and has been difficult to confirm the concrete part of damaging, and the position of damage might be sensor core or transmitter processing module, is difficult to quick fault location place; Now a lot of producers are accustomed to pressure unit is dismantled in the pressure unit that processing is broken down; Method according to routine detects, and inspection and maintenance is cumbersome like this, and expends time in and manpower.
The utility model content
In order to overcome the above-mentioned defective and the deficiency of prior art, the utility model provides a kind of transmitter fault diagnosis circuit.
A kind of transmitter fault diagnosis circuit that the utility model provides comprises:
Sensor is used to detect physical quantity and forms detection signal;
Signal processing module is used to receive the detection signal of said sensor and handles back output;
The standard signal load module is used for to said signal processing module standard signal being provided;
Change-over switch, said change-over switch is connected with signal processing module with said sensor, also is connected with signal processing module with said standard signal load module simultaneously;
When connecting said sensor and signal processing module, said change-over switch breaks off said standard signal load module and signal processing module; Or said change-over switch is connected said standard signal load module and signal processing module when breaking off said sensor with signal processing module.
Preferably, said sensor comprises pressure transducer, temperature sensor, liquid level sensor or flow sensor.
Preferably, said pressure transducer is the differential type pressure transducer, and said change-over switch is the DPDT change-over switch.
Preferably; Two end pin of said differential type pressure transducer insert the normal phase input end and the inverting input of said signal processing module respectively; Two other end pin inserts a side of said DPDT change-over switch respectively; Two end pin of said standard signal load module insert the opposite side of said DPDT change-over switch respectively, and two switching cuttves of said DPDT change-over switch insert first of said signal processing module respectively and become the feed signals input end and the second change feed signals input end.
Preferably, said DPDT change-over switch is by the change-over switch of external signal control or the change-over switch of manual switchover.
Preferably; Said change-over switch is the single-pole double-throw (SPDT) change-over switch; An end pin of said pressure transducer inserts said signal processing module; Other end pin inserts a side of said single-pole double-throw (SPDT) change-over switch, and an end pin of said standard signal load module inserts the opposite side of said single-pole double-throw (SPDT) change-over switch, and the switching cutter of said single-pole double-throw (SPDT) change-over switch inserts said signal processing module.
Preferably, the signal value of said standard signal for from the scope of unfaulty conditions lower sensor output detection signal, choosing.
The beneficial effect that a kind of transmitter fault diagnosis circuit that adopts the utility model to provide brings is: (1) the utility model adds the standard signal load module in original transmitter circuit; Be used for signal to a standard of signal processing module input; This standard signal selects a value but in the scope of the detection signal of exporting during operate as normal under the sensor unfaulty conditions.Change-over switch is set simultaneously, switches through change-over switch that sensor is connected with signal processing module or the standard signal input block is connected with signal processing module.When breaking down; Change-over switch cut-out sensor is connected with signal processing module, changes into connecting standard signal load module and signal processing module, imports a standard signal by the standard signal load module to signal processing module; Signal processing module is handled back output according to normal standard signal; As it is also normal to export the result, but then failure judgement not at signal processing module, and at sensor.Otherwise then fault is at signal processing module.Through a standard signal load module is set, the reference signal of a standard signal is provided, switch through change-over switch, simple in structure, fault judgement is clear, convenient.Principles of construction is simple, cost is low, be convenient to maintenance, can on existing transmitter basis, improve and can realize.And it is little to take up room, and is beneficial to the miniaturization of transmitter.(2) change-over switch adopts the switch that is switched by external control signal control, and control is convenient, and whole transmitter can be done encapsulation process, is difficult for falling ash, prolongs transmitter serviceable life.
Description of drawings
The circuit diagram of the fault diagnosis circuit that provides for the utility model shown in Figure 1.
The circuit diagram of fault diagnosis circuit in the specific embodiment that provides for the utility model shown in Figure 2.
Embodiment
To combine the accompanying drawing among the utility model embodiment below, the technical scheme among the utility model embodiment is carried out clear, intactly description, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, for the utility model provides a kind of transmitter fault diagnosis circuit, comprising:
Sensor 11 is used to detect physical quantity and forms detection signal; The physical quantity that detects can be parameter informations such as temperature, pressure, liquid level, flow.
Signal processing module 12 is used to receive the detection signal of said sensor and handles back output; The processing of 12 pairs of detection signals of signal processing module mainly is that it is amplified back output.
Standard signal load module 13 is used for to said signal processing module 12 standard signal being provided.The signal value of said standard signal for from the scope of unfaulty conditions lower sensor 11 output detection signals, choosing.This signal value is as standard signal, the detection signal of exporting when being used to embody normal operation of sensor, during non-fault.
Change-over switch 14, said change-over switch 14 is connected with signal processing module 12 with said sensor 11, also is connected with signal processing module 12 with said standard signal load module 13 simultaneously;
When connecting said sensor 11 and signal processing module 12, said change-over switch 14 breaks off said standard signal load module 13 and signal processing module 12; Or said change-over switch 14 is connected said standard signal load module 13 and signal processing module 12 when breaking off said sensor 11 and signal processing module 12.
Said sensor 11 comprises pressure transducer, temperature sensor, liquid level sensor or flow sensor.In the present embodiment, as shown in Figure 2, sensor 11 is a pressure transducer, and said pressure transducer is the differential type pressure transducer, and said change-over switch 14 is the DPDT change-over switch.
As shown in Figure 2; Two end pin of said differential type pressure transducer insert the normal phase input end IN+ and the inverting input IN-of said signal processing module 12 respectively; Two other end pin inserts the A1 pin and the A2 pin of said DPDT change-over switch one side respectively; Two end pin of said standard signal load module 13 insert the B1 pin and the B2 pin of said DPDT change-over switch opposite side respectively, and two switching cutter C of said DPDT change-over switch insert first of said signal processing module respectively and become the feed signals input end IP1 and the second change feed signals input end IP2.Circuit diagram shown in 1 illustrates the difference according to sensor type; Such as sensors such as differential type, mono signals; Its output can be one-channel signal or multiple signals; The A1 to An of corresponding change-over switch, B1 to Bn does corresponding number change, and first of input signal processing module becomes feed signals input end IP1 to the n change feed signals input end IPn and also does corresponding number change.Embodiment sensor shown in Figure 2 adopts the differential type pressure transducer.
In the present embodiment, said DPDT change-over switch is the change-over switch by external signal control, and outside control signal inserts the DPDT change-over switch its switching is controlled.Except that the change-over switch that present embodiment provides, also can adopt the change-over switch of manual switchover, through manually switching.
The failure detector circuit of the utility model is at first operated change-over switch 14 commutation circuits when detection failure, signal processing module 12 is connected with standard signal load module 13, breaks off sensor 11 and signal processing module 12.Standard signal load module 13 is to the signal of a standard of signal processing module 12 inputs, and this standard signal is under sensor 11 unfaulty conditions, a choosing value but in the scope of the detection signal of exporting during operate as normal.Signal processing module 12 carries out exporting after the processing and amplifying according to normal standard signal, and the result is also normal like output, but then failure judgement not at signal processing module 12, and at sensor 11.Otherwise then fault is at signal processing module 12.Through a standard signal load module 13 is set, the reference signal of a standard signal is provided, switch through change-over switch 14, simple in structure, fault judgement is clear, convenient.Principles of construction is simple, cost is low, be convenient to maintenance, can on existing transmitter basis, improve and can realize.And it is little to take up room, and is beneficial to the miniaturization of transmitter.
In another preferred embodiment that the utility model provides; Difference is; Said pressure transducer is single-signal sensor, and corresponding, said change-over switch is the single-pole double-throw (SPDT) change-over switch; An end pin of said pressure transducer inserts said signal processing module; Other end pin inserts a side of said single-pole double-throw (SPDT) change-over switch, and an end pin of said standard signal load module inserts the opposite side of said single-pole double-throw (SPDT) change-over switch, and the switching cutter of said single-pole double-throw (SPDT) change-over switch inserts said signal processing module.
One of ordinary skill in the art will appreciate that; Realize that all or part of step in the foregoing description method is to instruct relevant hardware to accomplish through program; Described program can be stored in the computer read/write memory medium, and this program comprises the step like above-mentioned method embodiment when carrying out; Described storage medium; As: magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.In each method embodiment of the utility model; The sequence number of said each step can not be used to limit the sequencing of each step; For those of ordinary skills, under the prerequisite of not paying creative work property, the priority of each step is changed also within the protection domain of the utility model.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.

Claims (7)

1. a transmitter fault diagnosis circuit is characterized in that, comprising:
Sensor (11) is used to detect physical quantity and forms detection signal;
Signal processing module (12) is used to receive the detection signal of said sensor and handles back output;
Standard signal load module (13) is used for to said signal processing module (12) standard signal being provided;
Change-over switch (14), said change-over switch (14) is connected with signal processing module (12) with said sensor (11), also is connected with signal processing module (12) with said standard signal load module (13) simultaneously;
When connecting said sensor (11) and signal processing module (12), said change-over switch (14) breaks off said standard signal load module (13) and signal processing module (12); Or said change-over switch (14) is connected said standard signal load module (13) and signal processing module (12) when breaking off said sensor (11) with signal processing module (12).
2. fault diagnosis circuit according to claim 1 is characterized in that: said sensor (11) comprises pressure transducer, temperature sensor, liquid level sensor or flow sensor.
3. fault diagnosis circuit according to claim 2 is characterized in that: said pressure transducer is the differential type pressure transducer, and said change-over switch (14) is the DPDT change-over switch.
4. fault diagnosis circuit according to claim 3; It is characterized in that: two end pin of said differential type pressure transducer insert the normal phase input end (IN+) and the inverting input (IN-) of said signal processing module (12) respectively; Two other end pin inserts a side (A) of said DPDT change-over switch respectively; Two end pin of said standard signal load module (13) insert the opposite side (B) of said DPDT change-over switch respectively, and two switching cuttves (C) of said DPDT change-over switch insert first of said signal processing module respectively and become the feed signals input end (IP1) and the second change feed signals input end (IP2).
5. fault diagnosis circuit according to claim 4 is characterized in that: said DPDT change-over switch is by the change-over switch of external signal control or the change-over switch of manual switchover.
6. fault diagnosis circuit according to claim 2; It is characterized in that: said change-over switch is the single-pole double-throw (SPDT) change-over switch; An end pin of said pressure transducer inserts said signal processing module; Other end pin inserts a side of said single-pole double-throw (SPDT) change-over switch, and an end pin of said standard signal load module inserts the opposite side of said single-pole double-throw (SPDT) change-over switch, and the switching cutter of said single-pole double-throw (SPDT) change-over switch inserts said signal processing module.
7. according to the arbitrary described fault diagnosis circuit of claim 1 to 6, it is characterized in that: the signal value of said standard signal for from the scope of unfaulty conditions lower sensor (11) output detection signal, choosing.
CN 201120348775 2011-05-30 2011-09-16 Fault diagnosis circuit of transducer Expired - Fee Related CN202304869U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201120348775 CN202304869U (en) 2011-05-30 2011-09-16 Fault diagnosis circuit of transducer

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Application Number Priority Date Filing Date Title
CN201110142962.7 2011-05-30
CN201110142962 2011-05-30
CN 201120348775 CN202304869U (en) 2011-05-30 2011-09-16 Fault diagnosis circuit of transducer

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CN201110275915XA Expired - Fee Related CN102322890B (en) 2011-05-30 2011-09-16 Transmitter fault diagnosis circuit and method thereof

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WO2012163191A1 (en) 2012-12-06
CN102322890B (en) 2013-11-20

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