CN116907317A - Automatic identification device and method for vibrating wire type sensor and differential resistance type sensor - Google Patents
Automatic identification device and method for vibrating wire type sensor and differential resistance type sensor Download PDFInfo
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- CN116907317A CN116907317A CN202311176197.XA CN202311176197A CN116907317A CN 116907317 A CN116907317 A CN 116907317A CN 202311176197 A CN202311176197 A CN 202311176197A CN 116907317 A CN116907317 A CN 116907317A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
The application belongs to the technical field of a reader, and discloses an automatic identification device and an automatic identification method for a vibrating wire type sensor and a differential resistance type sensor, wherein the device comprises an interface gating module, a differential resistance type sensor driving module, a differential resistance type sensor identification module, a vibrating wire type sensor driving module, a vibrating wire type sensor identification module, a differential resistance type sensor acquisition module and a vibrating wire type sensor acquisition module; compared with the prior art, the device has the function of automatically identifying the differential resistance type sensor and the vibrating wire type sensor, and can realize multiplexing measurement of the differential resistance type sensor and the vibrating wire type sensor by matching with the differential resistance type sensor acquisition circuit and the vibrating wire type sensor acquisition circuit, so that the number of reading instruments carried by patrol staff can be reduced, and the convenience of in-situ detection is improved.
Description
Technical Field
The application belongs to the technical field of reading instruments, and particularly relates to an automatic identification device and an automatic identification method for a vibrating wire type sensor and a differential resistance type sensor.
Background
In order to realize safety monitoring of the dam, a vibrating wire type sensor or a differential resistance type sensor is often adopted to measure indexes such as stress, displacement, sedimentation and the like of each part of the dam; in the safety regulations of the dam, the sensors need to be inspected regularly, and safety detection personnel usually carry two kinds of reading instruments to detect and read the vibrating wire type sensor or the differential resistance type sensor respectively, so that the safety detection personnel need to switch between the two kinds of reading instruments more frequently, and the actual operation is inconvenient.
Disclosure of Invention
The application provides an automatic identification device and an automatic identification method for a vibrating wire type sensor and a differential resistance type sensor, which are used for realizing the automatic identification function of the vibrating wire type sensor and the differential resistance type sensor so as to improve the convenience of field detection.
In a first aspect, the object of the application is achieved by the following technical scheme:
an automatic identification device for vibrating wire type sensor and differential resistance type sensor, comprising:
the interface gating module comprises a first signal transmission channel and a second signal transmission channel, and is used for accessing a sensor to be detected and switching a transmission loop into the first signal transmission channel or the second signal transmission channel;
the differential resistance type sensor driving module is electrically connected with the interface gating module so as to output signal level in a differential resistance type sensor driving mode when the first signal transmission channels are communicated;
the differential resistance type sensor identification module is electrically connected with the differential resistance type sensor driving module, and is used for detecting and collecting signal level according to a differential resistance type sensor collection mode, identifying a sensor to be detected and outputting an identification signal of the differential resistance type sensor when the unknown type sensor is the differential resistance type sensor;
the vibrating wire type sensor driving module is electrically connected with the interface gating module so as to output signal level in a vibrating wire type sensor driving mode when the second signal transmission channel is communicated;
the vibrating wire type sensor identification module is electrically connected with the vibrating wire type sensor driving module, the vibrating wire type sensor identification module detects the collected signal level according to the collecting mode of the vibrating wire type sensor, the sensor to be detected is identified, and when the sensor of unknown type is the vibrating wire type sensor, the identification signal of the vibrating wire type sensor is output.
According to the technical scheme, when the interface gating module is connected with the sensor to be detected, the interface gating module is firstly connected with the first signal transmission channel, so that the sensor to be detected is driven in a differential resistance type sensor driving mode, the differential resistance type sensor identification module detects whether the sensor to be detected is the differential resistance type sensor, if the sensor to be detected is the differential resistance type sensor, an identification signal of the differential resistance type sensor is output, and if the sensor to be detected is not the differential resistance type sensor, an identification signal of the differential resistance type sensor is not output, and therefore the function of automatically identifying the differential resistance type sensor is achieved; when the sensor to be detected is not a differential resistance type sensor, the interface gating module cuts off the first signal transmission channel and connects the second signal transmission channel, so that the sensor to be detected is driven in a vibrating wire type sensor driving mode, the vibrating wire type sensor identification module detects whether the sensor to be detected is a vibrating wire type sensor, if the sensor to be detected is a vibrating wire type sensor, an identification signal of the vibrating wire type sensor is output, and if the sensor to be detected is not a vibrating wire type sensor, an identification signal of the vibrating wire type sensor is not output, and therefore an automatic identification function of the vibrating wire type sensor is achieved; compared with the prior art, the device has the function of automatically identifying the differential resistance type sensor and the vibrating wire type sensor, and can realize multiplexing measurement of the differential resistance type sensor and the vibrating wire type sensor by matching with the differential resistance type sensor acquisition circuit and the vibrating wire type sensor acquisition circuit, so that the number of reading instruments carried by patrol staff can be reduced, and the convenience of in-situ detection is improved.
The application is further provided with: the interface gating module is provided with a plurality of optical coupler isolation units, each optical coupler isolation unit is provided with an enabling end for externally connecting a controller, and each optical coupler isolation unit is electrically connected to a signal wire corresponding to a sensor to be detected.
According to the technical scheme, the interface gating module is composed of a plurality of optical coupler isolation units, so that when a sensor to be detected is connected to the interface gating module, the differential resistance type sensor driving, identifying and collecting circuit and the vibrating wire type sensor driving, identifying and collecting circuit are isolated, and identification errors caused by mutual interference are avoided when the differential resistance type sensor and the vibrating wire type sensor are identified; each optical coupler isolation unit is provided with an enabling end for an external controller, and when the enabling end is accessed to a low level, the corresponding optical coupler isolation unit is connected with a signal wire corresponding to a sensor to be detected.
The application is further provided with: the vibrating wire sensor driving module comprises a driving unit and an excitation signal conversion unit for externally connecting an excitation control signal, wherein the excitation signal conversion unit is electrically connected with the driving unit, the driving unit is electrically connected with the interface gating module, so that when the second signal transmission channel is communicated, the excitation signal conversion unit provides a corresponding conversion signal for the driving unit, and the driving unit outputs a signal level in a vibrating wire sensor driving mode according to the corresponding conversion signal; the vibrating wire type sensor identification module comprises a sensor load detection unit and an access signal conversion unit, wherein the sensor load detection unit is electrically connected to the driving unit, and the sensor load detection unit is electrically connected to the access signal conversion unit, so that when the sensor load detection unit receives the output signal level of the vibrating wire type sensor in a driving mode, the sensor load detection unit is connected with the access signal conversion unit, and the access signal conversion unit outputs the identification signal of the vibrating wire type sensor.
Through the technical scheme, the vibrating wire sensor driving module is composed of the driving unit and the excitation signal conversion unit, when the second signal transmission channel is communicated, the excitation signal conversion unit receives an excitation control signal, and the excitation control signal can be a PWM excitation control signal sent by the singlechip or an excitation control signal with constant level; the excitation signal conversion unit converts the excitation control signal and then outputs a corresponding conversion signal to the driving unit, the driving unit drives the sensor to be detected in a vibrating wire type sensor driving mode according to the corresponding conversion signal, and if the sensor to be detected is a vibrating wire type sensor, the sensor load detection unit outputs an identification signal of the vibrating wire type sensor through the access signal conversion unit, so that the effect of automatic identification of the vibrating wire type sensor is achieved.
The application is further provided with: the differential resistance type sensor driving module comprises a voltage reference unit and a first operational amplifier unit, wherein the voltage reference unit is electrically connected with the first operational amplifier unit; the first operational amplifier unit is electrically connected to the interface gating module, so as to output a signal level in a differential resistance type sensor driving mode when the first signal transmission channel is communicated.
Through the technical scheme, the differential resistance type sensor driving module comprises a voltage reference unit and a first operational amplifier unit, wherein the voltage reference unit is used for providing a voltage reference point for the first operational amplifier unit, when a first signal transmission channel is communicated, if a sensor to be detected is a differential resistance type sensor, the sensor to be detected and the first operational amplifier unit form a homodromous amplifying circuit, and if the sensor to be detected is not the differential resistance type sensor, the first operational amplifier unit compares the voltage reference with the ground level in a comparator mode.
The application is further provided with: the differential resistance sensor identification module includes:
the first comparison unit is electrically connected with the first operational amplifier unit, so that when the differential resistance sensor is not connected, the signal level output by the first operational amplifier unit is higher than the first reference level of the first comparison unit, and the first comparison unit does not output the identification signal of the differential resistance sensor; when the differential resistance type sensor is connected, the signal level output by the first operational amplifier unit is lower than the first reference level of the first comparison unit, and the first comparison unit outputs a first identification signal of the differential resistance type sensor;
the first analog switch unit is electrically connected with the first signal transmission channel so as to connect the corresponding wiring detection channel and output wiring detection level when the first signal transmission channel is communicated;
a second comparing unit electrically connected to the first analog switching unit so as not to output a second identification signal of the differential sensor when the wiring detection level is lower than a preset second reference level; outputting a second identification signal of the differential resistance sensor when the wiring detection level is higher than a preset second reference level;
the identification signal of the differential resistance sensor includes the first identification signal and the second identification signal.
According to the technical scheme, the differential resistance type sensor is provided with the first comparison unit, the first comparison unit is provided with the first reference level, when the signal level output by the driving mode of the differential resistance type sensor is lower than the first reference level, the sensor to be detected is the differential resistance type sensor, and the first identification signal of the differential resistance type sensor is output, so that the identification of the differential resistance type sensor is realized; the first analog switch unit is electrically connected with the first signal transmission channel, when the first signal transmission channel is communicated, the corresponding wiring detection channel is connected and the wiring detection level is output to the second comparison unit, if the wiring detection level is higher than the second reference level, the signal lines of the differential resistance sensor are correctly connected (namely, black lines, red lines and green lines of the differential resistance sensor are all connected), and the second comparison unit outputs a second identification signal; compared with the prior art, the device provided by the application also has the function of wiring detection.
In a second aspect, the object of the present application is achieved by the following technical solutions:
an automatic identification method of a vibrating wire type sensor and a differential resistance type sensor is applied to the automatic identification device of the vibrating wire type sensor and the differential resistance type sensor, and the method comprises the following steps:
the interface gating module is connected with a first signal transmission channel;
the differential resistance type sensor identification module identifies whether the sensor to be detected is a differential resistance type sensor or not;
if yes, selecting a corresponding acquisition module to acquire data of the sensor to be detected;
if not, the interface gating module (1) disconnects the first signal transmission channel and connects the second signal transmission channel;
the vibrating wire type sensor identification module identifies whether the sensor to be detected is a vibrating wire type sensor or not;
if yes, selecting a corresponding acquisition module to acquire data of the sensor to be detected;
if not, disconnecting the second signal transmission channel;
and circularly executing the steps of switching on the first signal transmission channel to switching off the second signal transmission channel by the interface gating module.
According to the technical scheme, the interface gating module is firstly connected with the first signal transmission channel, the differential resistance sensor identification module starts to identify whether the sensor to be detected is a differential resistance sensor, and if the sensor to be detected is the differential resistance sensor, the data acquisition can be carried out on the sensor to be detected through the existing corresponding acquisition module; if the sensor to be detected is not a differential resistance type sensor, the interface gating module cuts off the first signal transmission channel, switches on the second signal transmission channel, and the vibrating wire type sensor identification module starts to identify whether the sensor to be detected is a vibrating wire type sensor or not; compared with the prior art, the method provided by the application realizes automatic identification and multiplexing reading of the vibrating wire sensor and the differential resistance sensor.
In summary, the present application includes at least one of the following beneficial technical effects:
compared with the prior art, the device has the function of automatically identifying the differential resistance type sensor and the vibrating wire type sensor, and can realize multiplexing measurement of the differential resistance type sensor and the vibrating wire type sensor by matching with the differential resistance type sensor acquisition circuit and the vibrating wire type sensor acquisition circuit, so that the number of reading instruments carried by patrol staff can be reduced, and the convenience of in-situ detection is improved.
Drawings
FIG. 1 is a circuit diagram of a vibrating wire sensor and a differential resistance sensor;
FIG. 2 is a circuit diagram of an automatic identification device for vibrating wire sensors and differential resistance sensors according to an embodiment of the present application;
FIG. 3 is a circuit diagram of an interface gating module according to a first embodiment of the present application;
FIG. 4 is a circuit diagram of a differential resistance sensor driving module according to an embodiment of the application;
FIG. 5 is a circuit diagram of a differential resistance sensor identification module according to an embodiment of the application;
FIG. 6 is a circuit diagram of a vibrating wire sensor drive module and a vibrating wire sensor identification module in accordance with an embodiment of the application;
fig. 7 is a flowchart of an automatic identification method of a vibrating wire sensor and a differential resistance sensor in a second embodiment of the application.
Reference numerals illustrate:
1. an interface gating module; 11. a first signal transmission channel; 12. a second signal transmission channel; 2. a differential resistance sensor driving module; 21. a voltage reference unit; 22. a first operational amplifier unit; 3. a differential resistance sensor identification module; 31. a first comparing unit; 32. a first analog switch unit; 33. a second comparing unit; 4. a vibrating wire sensor driving module; 41. a driving unit; 42. an excitation signal conversion unit; 5. a vibrating wire sensor identification module; 51. a sensor load detection unit; 52. accessing a signal conversion unit; 6. a differential resistance type sensor acquisition module; 7. and a vibrating wire type sensor acquisition module.
Detailed Description
The technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present application are included in the protection scope of the present application.
As shown in fig. 1, in order to realize safety monitoring of the dam, a vibrating wire sensor or a differential resistance sensor is often used to measure indexes such as stress, displacement, sedimentation and the like of each part of the dam; the vibrating wire type sensor is a five-wire type sensor, 5 signal output ports of the vibrating wire type sensor are respectively connected with a blue signal wire, a black signal wire, a red signal wire, a green signal wire and a white signal wire, wherein two ends of a vibrating wire in the vibrating wire type sensor are respectively connected with the black signal wire and the red signal wire, and two ends of an NTC resistor in the vibrating wire type sensor are respectively connected with the green signal wire and the white signal wire; the differential resistance type sensor is also a five-wire system sensor, 5 signal output ports of the differential resistance type sensor are also respectively connected with a blue signal wire, a black signal wire, a red signal wire, a green signal wire and a white signal wire, wherein two ends of a first resistor in the differential resistance type sensor are respectively connected with the black signal wire and the red signal wire, two ends of a second resistor in the differential resistance type sensor are respectively connected with the red signal wire and the green signal wire, the blue signal wire is connected with the black signal wire, and the green signal wire is connected with the white signal wire.
The safety inspection personnel usually carry two kinds of reading instruments to detect and read respectively the vibrating wire type sensor or the differential resistance type sensor, which requires the safety inspection personnel to switch between the two kinds of reading instruments frequently, and is inconvenient for practical operation.
The embodiment of the application provides an automatic identification device and an automatic identification method for a vibrating wire type sensor and a differential resistance type sensor, which are used for realizing the automatic identification function of the vibrating wire type sensor and the differential resistance type sensor so as to improve the convenience of field detection.
Example 1
As shown in fig. 2, the automatic identification device of the vibrating wire type sensor and the differential resistance type sensor comprises an interface gating module 1, a differential resistance type sensor driving module 2, a differential resistance type sensor identification module 3, a vibrating wire type sensor driving module 4 and a vibrating wire type sensor identification module 5;
as shown in fig. 2 and fig. 3, the interface gating module 1 includes a first signal transmission channel 11 and a second signal transmission channel 12, and the interface gating module 1 is used for accessing a sensor to be detected and switching a transmission loop into the first signal transmission channel 11 or the second signal transmission channel 12; the differential resistance type sensor driving module 2 is electrically connected with the interface gating module 1 and the differential resistance type sensor identification module 3, when the first signal transmission channel 11 is communicated, a signal level is output to the differential resistance type sensor identification module 3 in a differential resistance type sensor driving mode, so that the differential resistance type sensor identification module 3 identifies whether a sensor to be detected is the differential resistance type sensor or not, and if the sensor to be detected is the differential resistance type sensor, an identification signal of the differential resistance type sensor is output; if the sensor to be detected is not a differential resistance sensor, the identification signal of the differential resistance sensor is not output, so that the effect of automatically identifying the differential resistance sensor is realized; the vibrating wire type sensor driving module 4 is electrically connected with the interface gating module 1 and the vibrating wire type sensor identification module 5, when the second signal transmission channel 12 is communicated, the vibrating wire type sensor driving module 4 drives the sensor to be detected in a vibrating wire type sensor driving mode, the vibrating wire type sensor identification module 5 identifies whether the sensor to be detected is the vibrating wire type sensor, and if the sensor to be detected is the vibrating wire type sensor, the identification signal of the vibrating wire type sensor is output; if the sensor to be detected is not a vibrating wire type sensor, the identification signal of the vibrating wire type sensor is not output, so that the effect of automatically identifying the vibrating wire type sensor is realized.
Compared with the prior art, the device provided by the embodiment of the application has the functions of the differential resistance sensor and the vibrating wire sensor which are automatically identified, and can reduce the number of the reading instruments carried by the inspection staff so as to improve the convenience of field detection.
Referring to fig. 1 and 2, the device of the embodiment of the application further comprises a differential resistance type sensor acquisition module 6 and a vibrating wire type sensor acquisition module 7, wherein the differential resistance type sensor acquisition module 6 is connected with the interface gating module 1, and when the interface gating module 1 is connected with the differential resistance type sensor, the differential resistance type sensor acquisition module 6 performs data acquisition on the sensor to be detected through the interface gating module 1 and acquires the resistance sum of two resistors in the differential resistance type sensor and the resistance ratio of the two resistors; the vibrating wire type sensor acquisition module 7 is connected to the interface gating module 1, and when the interface gating module 1 is connected to the vibrating wire type sensor, the vibrating wire type sensor acquisition module 7 performs data acquisition on the sensor to be detected through the interface gating module 1 and acquires the oscillation frequency and the temperature value of the sensor to be detected.
It should be noted that, the differential resistance type sensor acquisition module 6 and the vibrating wire type sensor acquisition module 7 are both existing acquisition modules.
Compared with the prior art, the device provided by the embodiment of the application has the function of multiplexing the readings on the basis of automatically identifying the type of the sensor.
Referring to fig. 3, the interface gating module 1 includes a first optocoupler relay U1, a second optocoupler relay U2, a third optocoupler relay U3, a fourth optocoupler relay U4, and a fifth optocoupler relay U5, where in this embodiment, the optocoupler relays are all used as an optocoupler isolation unit of the interface gating module 1, and the optocoupler relays are existing 8-channel optocoupler relays; the optical coupling relay is used for switching blue, black, red, green and white lines of the sensor interface to be detected to be connected into the first signal transmission channel 11 or the second signal transmission channel 12, compared with the mechanical relay, the optical coupling relay is used for realizing the electrical isolation of two processing circuits, has the characteristics of long service life, low power consumption, quick on/off and the like, and is more suitable for the quick switching of the identification loop of the sensor to be detected;
the first pin of the first optocoupler relay U1 is connected with a resistor R1 in series and then is connected with 3V3, the second pin and the fourth pin of the first optocoupler relay U1 are enabled ends VW_EN, the third pin of the first optocoupler relay U1 is connected with a resistor R2 in series and then is connected with 3V3, the eighth pin of the first optocoupler relay U1 is connected with a blue signal line of a sensor to be detected, the sixth pin of the first optocoupler relay U1 is connected with a black signal line of the sensor to be detected, and the fifth pin of the first optocoupler relay U1 is electrically connected with the differential resistance sensor driving module 2;
the first pin of the second optocoupler relay U2 is connected with a resistor R3 in series and then is connected with 3V3, the second pin and the fourth pin of the second optocoupler relay U2 are enabled ends VW_EN, the third pin of the second optocoupler relay U2 is connected with a resistor R4 in series and then is connected with 3V3, the eighth pin of the second optocoupler relay U2 is connected with a red signal line of a sensor to be detected, the seventh pin of the second optocoupler relay U2 is electrically connected with a differential resistance sensor driving module 2, the sixth pin of the second optocoupler relay U2 is connected with a green signal line of the sensor to be detected, and the fifth pin of the second optocoupler relay U2 is connected with a vibrating wire sensor acquisition module 7 and a vibrating wire sensor driving module 4;
the first pin of the third optocoupler relay U3 is connected with a resistor R5 in series and then is connected with 3V3, the second pin of the third optocoupler relay U3 is an enabling end VW_EN, the fourth pin of the third optocoupler relay U3 is an enabling end DR_EN, the eighth pin of the third optocoupler relay U3 is connected with a white signal line of a sensor to be detected, and the seventh pin of the third relay U3 is connected with a vibrating wire sensor driving module 4; the sixth pin of the third optocoupler relay U3 is connected with a blue signal line of the sensor to be detected, and the fifth pin of the third optocoupler relay U3 is connected with the vibrating wire sensor driving module 4;
the first pin of the fourth optocoupler relay U4 is connected with a resistor R7 in series and then is connected with 3V3, the second pin and the fourth pin of the fourth optocoupler relay U4 are an enabling end DR_EN, the eighth pin of the fourth optocoupler relay U4 is connected with a black signal line of a sensor to be detected, the seventh pin of the fourth optocoupler relay U4 is electrically connected with the differential resistance sensor identification module 3 and the differential resistance sensor acquisition module 6, the sixth pin of the fourth optocoupler relay U4 is connected with a red signal line to be detected and sensed, and the fifth pin of the fourth optocoupler relay U4 is electrically connected with the differential resistance sensor identification module 3 and the differential resistance sensor acquisition module 6;
the first pin of the fifth optocoupler relay U5 is connected with a resistor R9 in series and then is connected with 3V3, the second pin and the fourth pin of the fifth optocoupler relay U5 are used as an enabling end DR_EN, the eighth pin of the fifth optocoupler relay U5 is connected with a green signal line of a sensor to be detected, the seventh pin of the fifth optocoupler relay U5 is connected with a differential resistance type sensor identification module 3 and a differential resistance type sensor acquisition module 6, the sixth pin of the fifth optocoupler relay U5 is connected with a white signal line of the sensor to be detected, and the fifth pin of the fifth optocoupler relay U5 is connected with the differential resistance type sensor acquisition module 6 and the differential resistance type sensor driving module 2.
Through the connection of each optocoupler relay and the corresponding module, when the enabling end of the optocoupler relay is connected to a low level, the cable of the sensor to be detected is connected to the processing circuit of the differential resistance sensor or the processing circuit of the vibrating wire sensor, and at the moment, the processing circuits of the two sensors can be operated to drive, identify and collect.
Referring to fig. 4, the differential resistance sensor driving module 2 includes a voltage reference unit 21 and a first operational amplifier unit 22;
the voltage reference unit 21 comprises a voltage reference chip U11, a capacitor C11 and a capacitor C12, and the first operational amplifier unit 22 comprises a capacitor C13, a resistor R34, a resistor R35 and an operational amplifier U12A;
the third pin of the voltage reference chip U11 is grounded, the first pin of the voltage reference chip U11 is connected with 5V, and the second pin of the voltage reference chip U11 is connected with the third pin of the operational amplifier U12A after being connected with the resistor R34 in series, so that the voltage reference unit 21 can be a reliable voltage reference point for the first operational amplifier unit 22; one end of the capacitor C11 is connected with the second pin of the voltage reference chip U11, the other end of the capacitor C12 is grounded, one end of the capacitor C12 is connected with the second pin of the voltage reference chip U11, and the other end of the capacitor C is grounded so as to improve the stability of the output voltage of the voltage reference unit 21;
one end of the resistor R35 is connected with the second pin of the operational amplifier U12A, the other end of the resistor R35 is grounded, the second pin of the operational amplifier U12A is connected with the corresponding optocoupler isolation unit, and the eighth pin of the operational amplifier U12A is connected with 5V; the fourth pin of the operational amplifier U12A is connected with-5V, the first pin of the operational amplifier U12A is connected with the corresponding optocoupler isolation unit and the differential resistance type sensor identification module 3, one end of the capacitor C13 is connected with the first pin of the operational amplifier U12A, and the other end of the capacitor C13 is grounded, so that when the first signal transmission channel 11 is communicated, the sensor to be detected is driven by the differential resistance type sensor driving mode output signal level.
Through the connection of the differential resistance type sensor driving module 2, if the differential resistance type sensor is not connected, the differential resistance type sensor driving module 2 outputs 5V in a comparator mode; when the differential resistance sensor is connected, the circuit and the differential resistance sensor form a homodromous amplifying circuit, and the output voltage range of the operational amplifier U12A is from a voltage reference to 5V according to the total resistance of the connected differential resistance sensor.
Referring to fig. 5, the differential resistance sensor identification module 3 includes a first comparison unit 31, a first analog switching unit 32, and a second comparison unit 33;
the first comparing unit 31 includes a comparator U13, a resistor R36, a resistor R37, a resistor R38, a resistor R39, a resistor R40, and a diode D3; the first analog switch unit 32 is constituted by an analog switch U14, and in the present embodiment, the analog switch U14 is an analog switch chip having sixteen pins; the second comparing unit 33 includes a comparator U15, a resistor R42, a resistor R43, a resistor R44, a resistor R45, a resistor R46, and a diode D4;
referring to fig. 5, the first pin of the comparator U13 is connected to 5V after being connected in series with the resistor R37, the first pin of the comparator U13 is grounded after being connected in series with the resistor R38, and the third pin of the comparator U13 is connected to the first pin of the operational amplifier U12A after being connected in series with the resistor R36; a fifth pin of the comparator U13 is connected with 5V, and a second pin of the comparator U13 is connected with-5V; the fourth pin of the comparator U13 is connected with the positive electrode of the diode D3, the negative electrode of the diode D3 is connected with a signal output end detection_blue, one end of the resistor R39 is connected with the fourth pin of the comparator U13, and the other end of the resistor R39 is grounded; one end of the resistor R40 is connected with the fourth pin of the comparator U13, and the other end of the resistor R is grounded.
Specifically, since the precision reference resistor R35 is used, the operational amplifier U12A outputs a voltage reference that is greater than the voltage reference by less than twice; the comparator U13 is used for comparing the first reference level divided by the resistor R37 and the resistor R38, when the differential resistance type sensor is connected, the DR_blue signal input by the comparator U13 is larger than the comparison level, the comparator U13 outputs a high level, when the differential resistance type sensor is connected with the comparator U13, the DR_blue signal input by the comparator U13 is smaller than the comparison level, the comparator U13 outputs a low level, and the connection detection of the differential resistance type sensor is realized based on the high and low levels output by the comparator U13.
Referring to fig. 5, a fifteenth pin, a fourteenth pin and a twelfth pin of the analog switch U14 are respectively connected to the first signal transmission channel 11, and a thirteenth pin of the analog switch U14 is connected to a third pin of the comparator U15 after being connected to the resistor R41 and the resistor R42 in series, and the pins of the analog switch U14 are arranged through the first analog switch unit 32, so that the thirteenth pin of the analog switch U14 is connected to the sensor cable to be detected and the comparator U15 when the first signal transmission channel 11 is connected;
referring to fig. 5, a first pin of the comparator U15 is connected with 1V25 after being connected with a resistor R43 in series, a first pin of the comparator U15 is connected with the resistor R46 in series and then grounded, a fifth pin of the comparator U15 is connected with 5V, a second pin of the comparator U15 is connected with-5V, a fourth pin of the comparator U15 is connected with an anode of a diode D4, a cathode of the diode D4 is connected with a signal output terminal detect_dr, one end of a resistor R44 is connected with a fourth pin of the comparator U15, and the other end is connected with 5V; one end of the resistor R45 is connected with the cathode of the diode D4, and the other end is grounded.
Through the connection of the electronic components in the second comparing unit 33, when the differential resistance sensor is connected and identified, the first analog switch unit 32 makes the three cables of black, red and green connected to the comparator U15 through the analog switch U14, and compares the three cables with the reference level divided by the resistor R42 and the resistor R46, when the connected cable is not connected correctly, the isdetect_dr signal is connected to the pull-down resistor, the comparator U15 outputs a low level, when the connected cable is connected correctly, the levels of the three cables of black, red and green are all higher than the reference level, and the comparator U15 outputs a high level, thereby realizing the connection detection of the three cables of black, red and green in the differential resistance sensor.
Referring to fig. 3 and 6, the vibrating wire sensor driving module 4 includes a driving unit 41 and an excitation signal converting unit 42 for externally connecting an excitation control signal;
the driving unit 41 is composed of a driving chip U7 and a resistor R15 of a resistor R13, and the driving chip U7 adopts an existing H-bridge driver;
the excitation signal conversion unit 42 includes a resistor R12, a resistor R14, a triode Q2, and a triode Q3, wherein an emitter of the triode Q2 is connected with the resistor R12 and then connected with 3V3, a base of the triode Q2 is provided with a control port vw_scan1 for receiving an external PWM excitation control signal, and a collector of the triode Q2D is connected with a first pin of the driving chip U7, in this embodiment, the PWM excitation control signal is sent by any microcontroller; the emitter of the triode Q3 is connected with a resistor R14 in series and then is connected with 3V3; the base electrode of the triode Q3 is connected with a control port VW_Scan2 for receiving an external PWM excitation control signal; the collector electrode of the triode Q3 is connected with the second pin of the driving chip U7; the third pin of the driving chip U7 is connected with the grounding end M-VCC, and the fourth pin of the driving chip U7 is connected with the power end M+VCC; the seventh pin and the eighth pin of the driving chip U7 are in short circuit, the seventh pin of the driving chip U7 is connected with the corresponding optocoupler relay in series with the resistor R13, the sixth pin and the fifth pin of the driving chip U7 are in short circuit, and the fifth pin of the driving chip U7 is connected with the corresponding optocoupler relay in series with the resistor R15.
Through the connection of the electronic elements in the vibrating wire sensor driving module 4, the H-bridge driver is used for outputting the signal level of the vibrating wire sensor, the signal level is controlled by two corresponding excitation control signals of VW_Scan1 and VW_Scan2, and in order to avoid damage caused by short circuit of the sensor red and black wires, a resistor R13 and a resistor R14 are added between the driver and the sensor red and black wires as current limiting resistors so as to realize circuit protection.
Referring to fig. 6, the vibrating wire sensor identification module 5 includes a sensor load detection unit 51 and an access signal conversion unit 52, wherein in the present embodiment, the sensor load detection unit 51 is constituted by a MOS transistor Q1; the access signal conversion unit 52 comprises a chip U6, a diode D1 and a resistor R11, wherein the source electrode of the MOS tube Q1 is connected with the eighth pin of the driving chip U7, the grid electrode of the MOS tube Q1 is connected with the corresponding optocoupler isolation unit in series with the resistor R13 and then is connected with the eighth pin of the driving chip U7, the drain electrode of the MOS tube Q1 is connected with the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected with the second pin of the chip U6; one end of the resistor R11 is connected with the second pin of the chip U6, and the other end of the resistor R11 is grounded; the fourth pin of the chip U6 serves as an output detect_vw.
In this embodiment, the chip U6 is an existing inverter, and in other embodiments, may be a CMOS buffer.
Through the connection of the electronic elements in the vibrating wire type sensor identification module 5, the connection detection of the vibrating wire type sensor is realized by detecting the voltage drop on the resistor of the current-limiting resistor R13 so as to realize the conduction of the MOS tube Q1; the external singlechip regulates the input of the VW_Scan1 and the VW_Scan2, so that a VW_Red signal outputs a high level and a VW_Black signal outputs a low level, when the vibrating wire sensor is not connected, no voltage drop exists on the resistor R13, the MOS tube Q1 cannot be conducted, the input of the chip U6 is pulled down to the low level, and the chip U6 outputs a 3.3V high level; when the vibrating wire sensor is connected, the resistor R13 generates voltage drop, the MOS tube Q1 is conducted, the chip U6 inputs high level, and the chip U6 outputs 0V low level, so that the connection detection of the vibrating wire sensor is realized.
Example two
As shown in fig. 7, the embodiment of the application discloses an automatic identification method of a vibrating wire sensor and a differential resistance sensor, which is applied to an automatic identification device of the vibrating wire sensor and the differential resistance sensor in the above embodiment, and the method of the application comprises the following steps:
s10: the interface gating module is connected with the first signal transmission channel.
Specifically, the existing controller sends low level to the enable terminals dr_en of the third optocoupler relay U3, the fourth optocoupler relay U4, and the fifth optocoupler relay U5, so that the first signal transmission channel is turned on.
S20: the differential resistance sensor identification module identifies whether the sensor to be detected is a differential resistance sensor.
Specifically, the differential resistance type identification module identifies according to the signal level sent by the differential resistance type sensor driving module and the signal level of the sensor to be detected.
S30: if yes, selecting a corresponding acquisition module to acquire data of the sensor to be detected.
Specifically, the first reference level obtained by dividing the comparator U13 with the resistor R37 and the resistor R38 is compared with the output level of the operational amplifier U12A, when the differential resistance sensor is connected, the output level of the operational amplifier U12A is lower than the first reference level, the sensor to be detected is judged to be the differential resistance sensor, and then the existing differential resistance sensor acquisition module is selected to acquire data of the sensor to be detected.
S40: if not, the interface gating module cuts off the first signal transmission channel and switches on the second signal transmission channel.
Specifically, when the differential resistance sensor is not connected, the comparator U13 inputs dr_blue signal of 5V, which is higher than the comparison level, determines that the sensor to be detected is not the differential resistance sensor, and executes the determination flow of the vibrating wire sensor.
S50: the vibrating wire sensor identification module identifies whether the sensor to be detected is a vibrating wire sensor.
Specifically, when the U6 in the vibrating wire sensor identification module outputs a digital signal which is not connected with the vibrating wire sensor, the sensor to be detected is the vibrating wire sensor.
S60: if yes, selecting a corresponding acquisition module to acquire data of the sensor to be detected.
Specifically, if the sensor to be detected is a vibrating wire type sensor, the data of the sensor to be detected is acquired through the existing vibrating wire type sensor acquisition module, so that the function of multiplexing reading is realized.
S70: if not, disconnecting the second signal transmission channel;
specifically, if the detection result is neither a vibrating wire sensor nor a differential resistance sensor, the external controller disconnects the second signal transmission channel.
S80: the steps of switching on the first signal transmission channel to switching off the second signal transmission channel of the interface gating module are cyclically performed.
Specifically, steps S10-S70 are executed in a circulating manner, and if the connection line between the device and the sensor to be detected is disconnected, the identification and detection of the sensor to be detected are stopped.
Compared with the prior art, the method provided by the application realizes automatic identification and multiplexing reading of the vibrating wire sensor and the differential resistance sensor.
In this embodiment, the method switches back to the differential resistance sensor part circuit again for recognition, the recognition can be switched back and forth to form a closed loop, and the recognition function has priority, wherein the differential resistance sensor has high priority, and if the two recognition circuits are successful in simultaneous recognition, the differential resistance sensor is used as the reference.
It should be noted that, in other embodiments, the steps of the above flow may be exchanged, where the identifying of the vibrating wire sensor is performed first, if the vibrating wire sensor is used, the data collecting is performed on the vibrating wire sensor, and if the vibrating wire sensor is not used, the identifying and the data collecting of the differential resistance sensor are performed.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme described in each embodiment can be modified or part of the characteristics can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of each embodiment of the present application, and are intended to be included in the scope of the present application.
Claims (6)
1. An automatic identification device for a vibrating wire sensor and a differential resistance sensor, which is characterized by comprising:
the interface gating module (1) comprises a first signal transmission channel (11) and a second signal transmission channel (12), wherein the interface gating module (1) is used for accessing a sensor to be detected and switching a transmission loop into the first signal transmission channel (11) or the second signal transmission channel (12);
a differential resistance sensor driving module (2) electrically connected to the interface gating module (1) to output a signal level in a differential resistance sensor driving mode when the first signal transmission channel (11) is communicated;
the differential resistance type sensor identification module (3) is electrically connected with the differential resistance type sensor driving module (2), the differential resistance type sensor identification module (3) detects and collects signal levels according to a differential resistance type sensor collection mode, the sensor to be detected is identified, and when the unknown type sensor is the differential resistance type sensor, an identification signal of the differential resistance type sensor is output;
a vibrating wire type sensor driving module (4) electrically connected to the interface gating module (1) to output a signal level in a vibrating wire type sensor driving mode when the second signal transmission channel (12) is communicated;
the vibrating wire type sensor identification module (5) is electrically connected with the vibrating wire type sensor driving module (4), the vibrating wire type sensor identification module (5) detects and collects signal levels according to a vibrating wire type sensor collection mode, the sensor to be detected is identified, and when the unknown type sensor is the vibrating wire type sensor, an identification signal of the vibrating wire type sensor is output.
2. The automatic identification device for vibrating wire sensors and differential resistance sensors according to claim 1, wherein the interface gating module (1) is provided with a plurality of optocoupler isolation units, each optocoupler isolation unit is provided with an enabling end for externally connecting a controller, and each optocoupler isolation unit is electrically connected to a signal wire corresponding to a sensor to be detected.
3. An automatic identification device of a vibrating wire sensor and a differential resistance sensor according to claim 2, wherein the vibrating wire sensor driving module (4) comprises a driving unit (41) and an excitation signal conversion unit (42) for externally connecting an excitation control signal, the excitation signal conversion unit (42) is electrically connected to the driving unit (41), the driving unit (41) is electrically connected to the interface gating module (1), so that when the second signal transmission channel (12) is communicated, the excitation signal conversion unit (42) provides a corresponding conversion signal to the driving unit (41), and the driving unit (41) outputs a signal level in a vibrating wire sensor driving mode according to the corresponding conversion signal; the vibrating wire type sensor identification module (5) comprises a sensor load detection unit (51) and an access signal conversion unit (52), wherein the sensor load detection unit (51) is electrically connected with the driving unit (41), and the sensor load detection unit (51) is electrically connected with the access signal conversion unit (52) so that when the sensor load detection unit (51) receives the output signal level in a vibrating wire type sensor driving mode, the sensor load detection unit (51) is connected with a power supply loop of the access signal conversion unit (52) to enable the access signal conversion unit (52) to output the identification signal of the vibrating wire type sensor.
4. The automatic identification device of vibrating wire sensors and differential resistance sensors according to claim 1, wherein the differential resistance sensor driving module (2) comprises a voltage reference unit (21) and a first operational amplifier unit (22), and the voltage reference unit (21) is electrically connected to the first operational amplifier unit (22); the first operational amplifier unit (22) is electrically connected to the interface gating module (1) to output a signal level in a differential resistance sensor driving mode when the first signal transmission channel (11) is communicated.
5. The automatic identification device of vibrating wire type sensor and differential resistance type sensor according to claim 4, wherein the differential resistance type sensor identification module (3) comprises:
the first comparison unit (31) is electrically connected to the first operational amplifier unit (22) so that when the differential resistance sensor is not connected, the signal level output by the first operational amplifier unit (22) is higher than the first reference level of the first comparison unit (31), and the first comparison unit (31) does not output the identification signal of the differential resistance sensor; when the differential resistance type sensor is connected, the signal level output by the first operational amplifier unit (22) is lower than the first reference level of the first comparison unit (31), and the first comparison unit (31) outputs a first identification signal of the differential resistance type sensor;
a first analog switch unit (32) electrically connected to the first signal transmission channel (11) to switch on a corresponding connection detection channel when the first signal transmission channel (11) is connected, and output a connection detection level;
a second comparing unit (33) electrically connected to the first analog switching unit (32) so as not to output a second identification signal of the differential sensor when the wiring detection level is lower than a preset second reference level; outputting a second identification signal of the differential resistance sensor when the wiring detection level is higher than a preset second reference level;
the identification signal of the differential resistance sensor includes the first identification signal and the second identification signal.
6. An automatic identification method for a vibrating wire sensor and a differential resistance sensor, which is characterized by being applied to the automatic identification device for the vibrating wire sensor and the differential resistance sensor according to claim 1, and comprising the following steps:
connecting the interface gating module (1) to the first signal transmission channel (11);
the differential resistance type sensor identification module (3) identifies whether the sensor to be detected is a differential resistance type sensor or not;
if yes, selecting a corresponding acquisition module to acquire data of the sensor to be detected;
if not, the interface gating module (1) disconnects the first signal transmission channel (11) and connects the second signal transmission channel (12);
a vibrating wire sensor identification module (5) identifies whether the sensor to be detected is a vibrating wire sensor or not;
if yes, selecting a corresponding acquisition module to acquire data of the sensor to be detected;
if not, disconnecting the second signal transmission channel (12);
the steps of switching on the first signal transmission channel (11) to switching off the second signal transmission channel (12) of the interface gating module (1) are cyclically performed.
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