CN109724729A - Wireless torque signal acquisition and receiving module and its control method - Google Patents
Wireless torque signal acquisition and receiving module and its control method Download PDFInfo
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- CN109724729A CN109724729A CN201811638808.7A CN201811638808A CN109724729A CN 109724729 A CN109724729 A CN 109724729A CN 201811638808 A CN201811638808 A CN 201811638808A CN 109724729 A CN109724729 A CN 109724729A
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Abstract
The invention discloses a kind of wireless torque signal acquisition and receiving module and its control method, including foil gauge, the foil gauge is connected with wireless acquisition module, and wireless acquisition module includes first singlechip, and first singlechip connects foil gauge through the first conditioning circuit；First conditioning circuit sends first singlechip after the torque signal zeroing and gain process by foil gauge, and first singlechip is also connected with the first wireless communication module；Wireless receiving module includes second singlechip, and second singlechip is connected with the second wireless communication module and the second conditioning circuit；Second wireless communication module and the first wireless communication module are wirelessly connected；The torque signal that second singlechip obtains first singlechip amplifies through the second conditioning circuit to be exported.The output signal of receiving module of the invention is voltage signal, has versatility；It realizes wireless acquisition module and remotely returns to zero and adjust gain.
Description
Technical field
The present invention relates to a kind of collecting sensor signal equipment, more particularly to a kind of wireless torque signal acquisition and reception
Module and its control method.
Background technique
The torsion-testing mode of transmission shaft mainly includes two kinds, one is conventional torque sensor is used, by torque sensing
Device is connected with measured axis, is connected in drive path, and since torque sensor is by calibration and detection, precision is higher, output letter
Number be voltage signal or frequency signal, can use conventional Universal Digital Collecting Equipment and be acquired, such as Advantech
PCI-1711 and PCI-1780 capture card.But this test mode needs to change former drive mechanism, makes the axial direction of drive mechanism
Distance increases, therefore is generally used for the engine bench test in laboratory, such as electrical measurement control technical concern Co., Ltd, Beijing section, Air China
ZH07 series torque sensor.
Another torsion-testing mode is that foil gauge is pasted on measured axis, foil gauge and wireless torque test module phase
Even, after strain signal is improved and acquired by test module, mode is sent to receiving device (test equipment by wireless communication
Or gateway).The volume of wireless torque test module is usually made small, by small battery powered, common battery is 6F22
Battery and 3.7V quadrate lithium battery, by wireless torque test module and battery bundled fixed on measured axis.Due to not needing to change
Become drive mechanism, is suitable for on-the-spot test, such as semiaxis torsion-testing when vehicle road test.This test mode needs certainly
Row pastes foil gauge and calibration measured axis, and precision is relatively low, needs to be replaced frequently battery, inconvenient for use.Also have in the market corresponding
Product, such as the TQ201H type wireless torque sensor node of Beijing Beetech Technology Inc. need mating corresponding reception to set
It is standby, i.e. dedicated gateway.
The defect of the prior art is, wireless torque acquisition module it is small in size, usually sealing structure, does not calibrate circuit
For returning to zero and adjusting gain (amplification factor), since there are unbalanced errors for foil gauge itself, if without zeroing, it cannot
Make full use of the reference voltage range of converter, when use is more demanding to the quality and barbola work of foil gauge.Each factory
It is two-way communication between the acquisition module and receiving module of family, the external communication interface of receiving module is generally RS485 or CAN is total
Line, message transmission rate is lower, and torque signal renewal frequency is generally within 1kHz, it is impossible to be used in high dynamic torque applications field
It closes.The communication interface and communication protocol of the receiving module of each producer are incompatible, are only used for the wireless sensor of our company
Module does not have versatility.
Summary of the invention
In view of at least one defect of the prior art, the object of the present invention is to provide a kind of wireless torque signal acquisition and
Receiving module and its control method, wherein the output signal of wireless receiving module is voltage signal, has versatility；Realize nothing
Line acquisition module remotely returns to zero and adjusts gain, can demarcate in measured axis operation process.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of wireless torque signal acquisition and reception mould
Block, including foil gauge, it is critical that the foil gauge is connected with wireless acquisition module, wireless acquisition module is wirelessly connected with
Wireless receiving module；
Wireless acquisition module includes first singlechip, and first singlechip connects foil gauge through the first conditioning circuit；First adjusts
Reason circuit sends first singlechip after the torque signal zeroing and gain process by foil gauge, and first singlechip is also connected with first
Wireless communication module；
Wireless receiving module includes second singlechip, and second singlechip is connected with the second wireless communication module and second
Conditioning circuit；Second wireless communication module and the first wireless communication module are wirelessly connected；
Second singlechip remotely controls the zeroing of the first conditioning circuit through first singlechip and adjusts gain；
The torque signal that second singlechip obtains first singlechip amplifies through the second conditioning circuit to be exported.
Structure of the invention is divided into acquisition and receives two parts, and collecting part includes foil gauge and wireless acquisition module,
Wherein strain gauge adhesion is on measured axis, and wireless acquisition module is fixed on measured axis by modes such as bindings, wireless collection mould
Block is connected with foil gauge and acquires torque signal, and wireless acquisition module is used for and wireless receiving module is communicated, and receives wireless
The zeroing or adjust gain command that receiving module is sent, and the torque data collected is sent to wireless receiving module.
Wireless acquisition module includes first singlechip, and first singlechip connects foil gauge through the first conditioning circuit；First adjusts
Reason circuit sends first singlechip after the torque signal zeroing and gain process by foil gauge, and first singlechip is also connected with the first nothing
Line communication module.
Receiving portion includes wireless receiving module, and wireless receiving module is used for and wireless acquisition module is communicated, including
Zeroing is sent to wireless acquisition module and is adjusted gain command and is received the torque data that wireless acquisition module is sent, wireless receiving
Torque data is converted to voltage signal and exported to test equipment, test equipment such as data collecting card etc., test equipment by module
It is connected with computer, and transfers data to computer.
Wireless receiving module includes second singlechip, and second singlechip is connected with the second wireless communication module and second
Conditioning circuit；Second wireless communication module and the first wireless communication module are wirelessly connected；
Second singlechip remotely controls the zeroing of the first conditioning circuit through first singlechip and adjusts gain；
The torque signal that second singlechip obtains first singlechip amplifies through the second conditioning circuit to be exported.
Wireless torque acquisition module in the prior art it is small in size, usually sealing structure, does not calibrate circuit and is used for
Zeroing and adjusting gain adjust amplification factor, since there are unbalanced errors for foil gauge itself, if without zeroing, it cannot
Make full use of the reference voltage range of converter, when use is more demanding to the quality and barbola work of foil gauge.It needs
Setting zeroing knob and gain adjustment knob on acquisition module；It can not achieve long-range zeroing and adjust gain, it cannot be in measured axis
It is demarcated in operation process.
The present invention remotely controls the zeroing of the first conditioning circuit through first singlechip by second singlechip and adjusts gain；No
It needs that zeroing knob and gain adjustment knob are arranged in wireless acquisition module；It may be implemented remotely to control the first conditioning circuit tune
Zero and adjust gain, can be demarcated in measured axis operation process.
Unbalanced error existing for foil gauge itself is eliminated, the reference voltage range of first singlechip is made full use of.
First conditioning circuit sends first singlechip, the first monolithic after the torque signal zeroing and gain process by foil gauge
Torque signal is converted to digital signal by machine, and it is single to be sent to second by the first wireless communication module, the second wireless communication module
Piece machine, second singlechip convert digital signals into analog signal, and by the amplification output of the second conditioning circuit to test equipment
And computer has versatility wherein the output signal of the second conditioning circuit is voltage signal.
The wireless acquisition module is provided with battery；Battery is the first conditioning circuit, the first monolithic through the first power circuit
Machine and the first wireless communication module power supply；
Wireless receiving module is provided with second source circuit, second source circuit is the second conditioning circuit, second singlechip
And second wireless communication module power supply；
Instrument is connected with computer to second conditioning circuit after tested.
By above-mentioned structure setting, wireless acquisition module is powered using battery, and battery is tied up on measured axis；Wireless receiving
Module is powered by second source circuit, and by amplified torque signal, instrument is sent to meter to second conditioning circuit after tested
Calculation machine facilitates tester to observe and record on computers the torque signal of measured axis.
First conditioning circuit includes differential amplifier circuit and two-way digital regulation resistance, the first singlechip connection two
The first variable resistance that railway digital potentiometer controls two-way digital regulation resistance exports zeroed signal, and the first of differential amplifier circuit is poor
Sub-signal input terminal SIN+ connection foil gauge obtains torque signal, and the second differential signal input SIN- of differential amplifier circuit connects
It connects the first variable resistance and obtains zeroed signal；Differential amplifier circuit is through its first differential signal outputs SOUT+ and the second difference
Signal output end SOUT- connection first singlechip output torque signal.
First singlechip may be configured as operational mode and calibration mode, and in the operating mode, differential amplifier circuit will strain
Through its first differential signal outputs SOUT+ and the second differential signal outputs after the torque signal enhanced processing of piece detection
SOUT- connection first singlechip output torque signal.
First singlechip may also be configured to calibration mode, and under calibration mode, first singlechip can be to differential amplifier circuit
The torque signal of the foil gauge of acquisition carries out zeroing processing.When measured axis is without torque, the is obtained by first singlechip
The output signal of one differential signal outputs SOUT+ and the second differential signal outputs SOUT-, if the difference of the two is less than
One threshold value then to the extent permitted by the error does not need to return to zero, if the difference of the two is greater than first threshold, needs to carry out
Zeroing, first is that being conducive to improve measurement accuracy, second is that being conducive to make full use of the conversion range of the converter of first singlechip.
Two-way digital regulation resistance is provided with the first variable resistance, and first singlechip is under calibration mode, wireless receiving second
After the zeroing instruction of single-chip microcontroller, the first variable resistance of control two-way digital regulation resistance is gradually increased, the first variable resistance and poor
Divide amplifying circuit connection output zeroed signal, makes the first differential signal outputs SOUT+ and the second differential signal outputs SOUT-
Output signal difference be less than first threshold, control error within the allowable range, then success of returning to zero.
First variable resistance of the two-way digital regulation resistance connects the second differential signal through parallel zeroing half-bridge circuit
Input terminal SIN-；
The parallel zeroing half-bridge circuit includes resistance R40, resistance R41, resistance R42 and resistance R43, resistance R40
One end connect reference voltage, the other end of resistance R40 is through one end of resistance R41 connection resistance R42, the other end of resistance R42
Ground connection；
The common end of adjustable side AD_W2 the connection resistance R40 and resistance R41 of first variable resistance, resistance R40 and resistance
The common end of R41 connects the second differential signal input SIN-；The fixing end AD_B2 of first variable resistance is grounded through resistance R43.
First variable resistance of the two-way digital regulation resistance connects differential amplifier circuit through parallel zeroing half-bridge circuit,
The precision of zeroing is improved, wherein the resistance value of resistance R43 is far longer than resistance R40, resistance R41, resistance R42, designs in this way
Effect is, the resistance value of the first variable resistance from 0 to the half-bridge circuit that returns to zero caused by variation maximum value signal intensity
Amplitude very little improves the precision of zeroing.
The cathode connection second of the anode of the first differential signal input SIN+ connection diode D1, diode D1 is poor
Sub-signal input terminal SIN-；The anode of second differential signal input SIN- connection diode D2, the cathode connection of diode D2
First differential signal input SIN+；Second differential signal input SIN- is also inputted through capacitor C11 the first differential signal of connection
Hold SIN+.
To prevent differential signal is excessive from the first conditioning circuit being caused to damage, between differential signal both ends two in parallel it is reversed
Diode D1 and diode D2, the difference of differential signal is limited within the scope of the pressure drop of single diode, diode D1 and
The selection model BAT54S of diode D2.
The first singlechip connection two-way digital regulation resistance controls its second adjustable resistance output gain adjustment signal；The
Two variable resistances are connect with differential amplifier circuit adjusts its gain.
By above-mentioned structure setting, two-way digital regulation resistance is provided with the second adjustable resistance, the second adjustable resistance and poor
Divide amplifying circuit connection, first singlechip is under calibration mode, the gain increase instruction or gain of wireless receiving second singlechip
After reducing instruction, by changing the resistance value of the second adjustable resistance, the gain of differential amplifier circuit is adjusted.
The differential amplifier circuit is two-stage differential amplifying circuit, and differential amplifier circuit includes positive primary amplifier U4B, just
To secondary amplifier U5B, reversed primary amplifier U4A, reversed secondary amplifier U5A；
The non-inverting input terminal of positive primary amplifier U4B is the first differential signal input SIN+；Positive primary amplifier U4B's
Inverting input terminal of the output end through the positive primary amplifier U4B of resistance R1 connection；
The non-inverting input terminal of reversed primary amplifier U4A is as the second differential signal input SIN-；Reversed primary amplifier U4A
Inverting input terminal of the output end through the reversed primary amplifier U4A of resistance R2 connection；
The non-inverting input terminal of the positive secondary amplifier U5B of the output end connection of positive primary amplifier U4B, positive secondary amplifier
Inverting input terminal of the output end of U5B through the positive secondary amplifier U5B of resistance R3 connection, the output end of positive secondary amplifier U5B are made
For the first differential signal outputs SOUT+；
The non-inverting input terminal of the reversed secondary amplifier U5A of the output end connection of reversed primary amplifier U4A；Reversed secondary amplifier
Inverting input terminal of the output end of U5A through the reversed secondary amplifier U5A of resistance R5 connection；The output end of reversed secondary amplifier U5A is made
For the second differential signal outputs SOUT-；
Inverting input terminal of the inverting input terminal of positive secondary amplifier U5B through the reversed secondary amplifier U5A of resistance R6 connection；
The inverting input terminal of positive primary amplifier U4B is also connected with the adjustable end AD_W1 of the second adjustable resistance；Second can power transformation
The inverting input terminal of the reversed primary amplifier U4A of the fixing end AD_B1 connection of resistance.
By above-mentioned two-stage differential amplifying circuit can the torque signal to foil gauge sufficiently amplified, it is positive primary
The non-inverting input terminal of amplifier U4B is the first differential signal input SIN+ connection foil gauge；
The non-inverting input terminal of reversed primary amplifier U4A is as the parallel zeroing half of the second differential signal input SIN- connection
Bridge circuit receives zeroed signal；
The inverting input terminal of positive primary amplifier U4B is also connected with the adjustable end AD_W1 of the second adjustable resistance；Second can power transformation
The inverting input terminal of the reversed primary amplifier U4A of the fixing end AD_B1 connection of resistance.
The resistance value for adjusting the second adjustable resistance can adjust the amplification factor i.e. gain of differential amplifier circuit；
The output end of positive secondary amplifier U5B is as the first differential signal outputs SOUT+；Reversed secondary amplifier U5A's
Output end is as the second differential signal outputs SOUT-；By the two output by returning to zero and the torque signal after gain process
Pass to first singlechip.
Reverse phase of the fixing end AD_B1 of the second adjustable resistance through the reversed primary amplifier U4A of current-limiting resistance R21 connection is defeated
Enter end；
First singlechip is connected with mode selection switch S11.
To prevent two-way digital regulation resistance overcurrent damage, the second of the two-way digital regulation resistance for being used to adjust gain can be changed
Resistance is used in series with resistance R21, plays the role of current limliting.
First singlechip can be set to calibration mode or operational mode by mode selection switch S11, in calibration mode
Under, first singlechip can receive the zeroing instruction of second singlechip, gain increase instruction, gain reduction instruction, put to difference
Big circuit zeroing adjusts gain.
In the operating mode, the torque signal of foil gauge is only passed to second singlechip by first singlechip, and signal is single
To transmission, be conducive to the rate for improving transfer of torque signal.
The second singlechip is provided with zeroing key S1, gain increases key S2, gain reduces key S3 and mode
Selection key S4；
Second conditioning circuit includes integrated transporting discharging U8A and follows amplifier U8B；The signal output end DAOUT of second singlechip
It is grounded through resistance R12, signal output end DAOUT is also connected with the non-inverting input terminal of integrated transporting discharging U8A, the reverse phase of integrated transporting discharging U8A
Input terminal is grounded through resistance R14, and the output end of integrated transporting discharging U8A is through the inverting input terminal of resistance R13 connection integrated transporting discharging U8A；
The output end connection of integrated transporting discharging U8A follows the non-inverting input terminal of amplifier U8B, and the output end of amplifier U8B is followed to connect
The inverting input terminal for following amplifier U8B is connect, the output end of amplifier U8B is followed to export amplified torque signal.
The key S1 that returns to zero is instructed for sending zeroing, and gain increases key S2 for sending gain increase instruction；Gain subtracts
Small key S3 reduces instruction for sending gain, and mode selection button S4 is used to second singlechip being set to calibration mode or fortune
Row mode can transported in calibration mode to first singlechip transmission zeroing instruction, gain increase instruction, gain reduction instruction
Row mode is only limitted to receive the torque signal that first singlechip is sent, and is one-way transmission, is conducive to improve transfer of torque signal
Rate.
Integrated transporting discharging U8A amplifies the signal output end DAOUT analog signal exported, follows amplifier U8B composition electricity
It presses follower by amplified analog signal output, reduces influence of the follow-up equipment to integrated transporting discharging U8A.
The control method of the wireless torque signal acquisition and receiving module, key are: the first singlechip
It is provided with demarcation flow and operational process；
The demarcation flow includes the following steps:
Step A1: first singlechip judges whether there is the instruction of second singlechip；If there is going to step A2, if do not turned
Step A13；
Does step A2: first singlechip decision instruction belong to zeroing instruction? if so, going to step A3, turn to walk if not
Rapid A7；
Step A3: gain is revised as maximum value by initial value by first singlechip, i.e., will be used to adjust two railway digitals of gain
The resistance value of the second adjustable resistance of potentiometer is set as 0；
Step A4: first singlechip acquires the first differential signal outputs SOUT+ and the second differential signal outputs SOUT-
Signal, the difference both calculated；
Step A5: first singlechip judges whether difference is less than first threshold；If it is greater than first threshold, then two-way is adjusted
The resistance value of first variable resistance of digital regulation resistance, and return step A4 is entered step if being not above first threshold
A6；
Step A6: gain recovery is initial value by first singlechip；Return step A1；
Step A7: first singlechip decision instruction belongs to gain increase instruction or gain reduces instruction；If it is gain
Increase instruction and go to step A8, goes to step A10 if belonging to gain and reducing instruction；
Step A8: first singlechip acquires the first differential signal outputs SOUT+ and the second differential signal outputs SOUT-
Signal；
Step A9: if the difference of the two is greater than second threshold, it is judged as spilling, issues alarm signal, go to step A1；
Otherwise reduce the resistance value of the second adjustable resistance of two-way digital regulation resistance；Go to step A1；
Step A10: first singlechip increases the resistance value of the second adjustable resistance of two-way digital regulation resistance；
Step A11: first singlechip acquires the first differential signal outputs SOUT+ and the second differential signal outputs
The signal of SOUT-；
Step A12: if the difference of first singlechip judgement the two is greater than second threshold, it is judged as spilling, issues report
Alert signal, goes to step A10；Otherwise, A1 is gone to step；
Step A13: the torque signal of first singlechip acquisition foil gauge is sent to second singlechip；Go to step A1；
The mode selection button S4 of the mode selection switch S11 of first singlechip and second singlechip are pushed into calibration mold
Formula, calibration mode include returning to zero and adjusting two functions of gain.Under calibration mode, first singlechip executes demarcation flow；First
It is two-way communication between single-chip microcontroller and second singlechip, will return to zero key S1, gain of second singlechip increases key S2, gain and subtract
The key-press status of small key S3 is sent to first singlechip, and first singlechip is returned to zero and adjusted increasing according to the instruction of key
Benefit, and the signal for acquiring foil gauge is sent to second singlechip.
First singlechip then runs zeroing process after receiving zeroing instruction, the difference for exporting the first conditioning circuit
Difference between signal, i.e. the first differential signal outputs SOUT+ and the signal of the second differential signal outputs SOUT- is less than
One threshold value returns to zero successfully within the allowable range；
After first singlechip is receiving gain adjustment instruction, including gain increase instruction and gain reduce instruction, then transport
Row gain adjustment process, the differential signal for exporting the first conditioning circuit, i.e. the first differential signal outputs SOUT+ and second are poor
Difference between the signal of sub-signal output end SOUT- increases or reduces.In order to accelerate the process of gain adjustment, propose " slow
Increase+subtract fastly " regulative mode." slow to increase " refers to that, if signal does not overflow, gain only increases when receiving gain increase instruction
One step, if signal overflows, gain is constant；When " subtracting fastly " refers to that receiving gain reduces instruction, if signal does not overflow,
Gain reduces a step, if signal overflows, gain can reduce always, until signal does not overflow.
Operational process includes the following steps:
Step B: the torque signal of first singlechip acquisition foil gauge is sent to second singlechip.
By the mode selection button S4 of the mode selection switch mode selection switch S11 of first singlechip and second singlechip
Operational mode is all pushed, first singlechip executes operational process, and under operational process, first singlechip is only by the torque of foil gauge
Signal passes to second singlechip, and signal is one-way transmission, is conducive to the rate for improving transfer of torque signal.Zeroing key S1,
It is invalid that gain increases key S2, gain reduction key S3.
Remarkable result: the present invention provides a kind of wireless torque signal acquisition and receiving module and its control methods, wherein
The output signal of wireless receiving module is voltage signal, has versatility；It is total to cancel each producer incompatible RS485, CAN
The communication interfaces such as line；Operating mode is divided into calibration mode and operational mode, in the operating mode, wireless acquisition module and wireless
Receiving module is one-way communication, and signal acquisition and renewal frequency are higher；It realizes wireless acquisition module and remotely returns to zero and adjust increasing
Benefit can demarcate in measured axis operation process, eliminate zeroing knob and gain adjustment knob in wireless acquisition module.
Detailed description of the invention
Fig. 1 is function structure chart of the invention；
Fig. 2 is the circuit diagram of first singlechip；
Fig. 3 is the circuit diagram of the first power circuit；
Fig. 4 is the circuit diagram of two-way digital regulation resistance；
Fig. 5 is the circuit diagram of differential amplifier circuit；
Fig. 6 is the circuit diagram of second singlechip；
Fig. 7 is the circuit diagram of second source circuit；
Fig. 8 is the circuit diagram of the second conditioning circuit；
Fig. 9 is zeroing key S1, gain increases key S2, gain reduces the circuit of key S3 and mode selection button S4
Figure.
Figure 10 is flow chart of the method for the present invention.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
As shown in Fig. 1-Figure 10, a kind of wireless torque signal acquisition and receiving module, including foil gauge 1, the foil gauge 1
It is connected with wireless acquisition module 2, wireless acquisition module 2 is wirelessly connected with wireless receiving module 3；
Wireless acquisition module 2 includes first singlechip 21, and first singlechip 21 connects foil gauge through the first conditioning circuit 22
1；First conditioning circuit 22 sends first singlechip 21, the first monolithic after the torque signal zeroing and gain process by foil gauge 1
Machine 21 is also connected with the first wireless communication module 23；
JP1 is power input interface, and two pins are respectively power supply and ground.JP2 is half-bridge foil gauge interface, three pins
Respectively reference voltage VREF, strain signal SIN+,.JP8 is wireless communicaltion module access, is connected with wireless communication module.
JP4 is that program downloads mouth.
Wireless receiving module 3 include second singlechip 31, second singlechip 31 be connected with the second wireless communication module 32, with
And second conditioning circuit 33；Second wireless communication module 32 and the first wireless communication module 23 are wirelessly connected；
Second singlechip 31 is through the remotely zeroing of the first conditioning circuit 22 of control and the adjusting gain of first singlechip 21；
The torque signal that second singlechip 31 obtains first singlechip 21 amplifies through the second conditioning circuit 33 to be exported.
Structure of the invention is divided into acquisition and receives two parts, and collecting part includes foil gauge 1 and wireless acquisition module
2, wherein foil gauge 1 is pasted on measured axis, and wireless acquisition module 2 is fixed on measured axis by modes such as bindings, is wirelessly adopted
Collection module 2 is connected with foil gauge 1 and acquires torque signal, and wireless acquisition module 2 is used for and wireless receiving module 3 is communicated,
The zeroing or adjust gain command that wireless receiving module 3 is sent are received, and sends the torque collected to wireless receiving module 3
Data.
Wireless acquisition module 2 includes first singlechip 21, and first singlechip 21 connects foil gauge through the first conditioning circuit 22
1；First conditioning circuit 22 sends first singlechip 21, the first monolithic after the torque signal zeroing and gain process by foil gauge 1
Machine 21 is also connected with the first wireless communication module 23.First wireless communication module 23 is provided with wireless communication chips and antenna；Its electricity
Lu Tulve.
Receiving portion includes wireless receiving module 3, and wireless receiving module 3 is used for and wireless acquisition module 2 is communicated, and is wrapped
It includes and sends zeroing to wireless acquisition module 2 and adjust gain command and receive the torque data that wireless acquisition module 2 is sent, wirelessly
Torque data is converted to voltage signal and exported to test equipment 4, such as data collecting card of test equipment 4 by receiving module 3, is surveyed
Test instrument 4 is connected with computer 5, and transfers data to computer 5.
Wireless receiving module 3 include second singlechip 31, second singlechip 31 be connected with the second wireless communication module 32, with
And second conditioning circuit 33；Second wireless communication module 32 and the first wireless communication module 23 are wirelessly connected；Second wireless communication
Module 32 is provided with wireless communication chips and antenna；Its circuit diagram omits.
Second singlechip 31 is through the remotely zeroing of the first conditioning circuit 22 of control and the adjusting gain of first singlechip 21；
The torque signal that second singlechip 31 obtains first singlechip 21 amplifies through the second conditioning circuit 33 to be exported.
Wireless torque acquisition module in the prior art it is small in size, usually sealing structure, does not calibrate circuit and is used for
Zeroing and adjusting gain adjust amplification factor, since foil gauge 1 has unbalanced error in itself, if without zeroing, no
The reference voltage range of converter can be made full use of, when use is more demanding to the quality and barbola work of foil gauge 1.It needs
Setting zeroing knob and gain adjustment knob on acquisition module；It can not achieve long-range zeroing and adjust gain, it cannot be tested
It is demarcated in axis operation process.
The present invention is by second singlechip 31 through the remotely zeroing of the first conditioning circuit 22 of control and the adjusting of first singlechip 21
Gain；Setting zeroing knob and gain adjustment knob in wireless acquisition module 2 are not needed；It may be implemented remotely to control the first tune
It manages the zeroing of circuit 22 and adjusts gain, can be demarcated in measured axis operation process.
Unbalanced error existing for foil gauge 1 itself is eliminated, the reference voltage range of first singlechip 21 is made full use of.
First conditioning circuit 22 sends first singlechip 21 after the torque signal zeroing and gain process by foil gauge 1, the
Torque signal is converted to digital signal by one single-chip microcontroller 21, passes through the first wireless communication module 23, the second wireless communication module 32
It is sent to second singlechip 31, second singlechip 31 converts digital signals into analog signal, and passes through the second conditioning circuit 33
Amplification output has general to test equipment 4 and computer 5 wherein the output signal of the second conditioning circuit 33 is voltage signal
Property.
The wireless acquisition module 2 is provided with battery 24；Battery 24 through the first power circuit 25 be the first conditioning circuit 22,
First singlechip 21 and the power supply of the first wireless communication module 23；
Wireless receiving module 3 is provided with second source circuit 34, second source circuit 34 is the second conditioning circuit 33, second
Single-chip microcontroller 31 and the power supply of the second wireless communication module 32；
Instrument 4 is connected with computer 5 to second conditioning circuit 33 after tested.
First power circuit 25 is powered after being depressured input supply voltage for other circuits, input voltage range 3.3-15V,
Compatible 3.7V lithium battery and 9V battery.
Second source circuit 34 is powered after being depressured input supply voltage for other circuits, input voltage 5V, output electricity
Press 3.3V.
Second singlechip 31 and 21 type selecting of first singlechip are C8051F410.
By above-mentioned structure setting, wireless acquisition module 2 is powered using battery 24, and battery 24 is tied up on measured axis；Nothing
Line receiving module 3 by second source circuit 34 power, second conditioning circuit 33 by amplified torque signal after tested
Instrument 4 is sent to computer 5, facilitates tester that the torque signal of measured axis is observed and recorded on computer 5.
First conditioning circuit 22 includes differential amplifier circuit 221 and two-way digital regulation resistance 222, first monolithic
Machine 21 connects the first variable resistance output zeroed signal that two-way digital regulation resistance 222 controls two-way digital regulation resistance 222, difference
First differential signal input SIN+ connection foil gauge 1 of amplifying circuit 221 obtains torque signal, differential amplifier circuit 221
Second differential signal input SIN- the first variable resistance of connection obtains zeroed signal；Differential amplifier circuit 221 is first poor through it
21 output torque signal of sub-signal output end SOUT+ and the second differential signal outputs SOUT- connection first singlechip.
Selected 222 model AD5235BRUZ250 of two-way digital regulation resistance.
First singlechip 21 may be configured as operational mode and calibration mode, and in the operating mode, differential amplifier circuit 221 will
It is exported after the torque signal enhanced processing that foil gauge 1 detects through its first differential signal outputs SOUT+ and the second differential signal
Hold 21 output torque signal of SOUT- connection first singlechip.
First singlechip 21 may also be configured to calibration mode, and under calibration mode, first singlechip 21 can be to differential amplification
The torque signal for the foil gauge 1 that circuit 221 acquires carries out zeroing processing.When measured axis is without torque, pass through the first monolithic
Machine 21 obtains the output signal of the first differential signal outputs SOUT+ and the second differential signal outputs SOUT-, if the two
Difference is less than first threshold and then to the extent permitted by the error does not need to return to zero, if the difference of the two is greater than first threshold,
It then returns to zero, first is that being conducive to improve measurement accuracy, second is that being conducive to make full use of the AD conversion of first singlechip 21
The conversion range of device.
Two-way digital regulation resistance 222 is provided with the first variable resistance, and first singlechip 21 is under calibration mode, wireless receiving
After the zeroing instruction of second singlechip 31, the first variable resistance of control two-way digital regulation resistance 222 is gradually increased, and first is variable
Resistance connect output zeroed signal with differential amplifier circuit 221, makes the first differential signal outputs SOUT+ and the second differential signal
The difference of the output signal of output end SOUT- is less than first threshold, controls error within the allowable range, then success of returning to zero.
First variable resistance of the two-way digital regulation resistance 222 connects the second difference letter through parallel zeroing half-bridge circuit
Number input terminal SIN-；
The parallel zeroing half-bridge circuit includes resistance R40, resistance R41, resistance R42 and resistance R43, resistance R40
One end connect reference voltage, the other end of resistance R40 is through one end of resistance R41 connection resistance R42, the other end of resistance R42
Ground connection；
The common end of adjustable side AD_W2 the connection resistance R40 and resistance R41 of first variable resistance, resistance R40 and resistance
The common end of R41 connects the second differential signal input SIN-；The fixing end AD_B2 of first variable resistance is grounded through resistance R43.
First variable resistance of the two-way digital regulation resistance 222 is through parallel zeroing half-bridge circuit connection differential amplification electricity
Road 221 improves the precision of zeroing, and wherein the resistance value of resistance R43 is far longer than resistance R40, resistance R41, resistance R42, in this way
The effect of design is, the resistance value of the first variable resistance from 0 to the half-bridge circuit that returns to zero caused by variation maximum value letter
Number amplitude of variation very little, improves the precision of zeroing.
Parallel zeroing half-bridge circuit, as shown in figure 5, upper bridge arm is resistance R40, lower bridge arm is by Liang Ge branch parallel connection group
At one of branch is made of two concatenated resistance R41, resistance R42, another branch is by two-way digital regulation resistance 222
The first variable resistance and resistance R43 be composed in series, the resistance value of resistance R43 is far longer than resistance R40, resistance R41, resistance R42,
The effect designed in this way is, the first variable resistance from 0 to the half bridge signal that returns to zero caused by variation maximum value variation width
Very little is spent, the precision of zeroing is improved.As shown in Figure 5, it is preferable that resistance R40 is 2000 ohm, resistance R41 is 22 ohm,
Resistance R42 is 2000 ohm, and resistance R43 is 120000 ohm, when the resistance of the first variable resistance of two-way digital regulation resistance 222
Value from 0 to 250000 between when changing, the half bridge signal that returns to zero is with respect to amplitude of variation less than 0.6%.
The cathode connection second of the anode of the first differential signal input SIN+ connection diode D1, diode D1 is poor
Sub-signal input terminal SIN-；The anode of second differential signal input SIN- connection diode D2, the cathode connection of diode D2
First differential signal input SIN+；Second differential signal input SIN- is also inputted through capacitor C11 the first differential signal of connection
Hold SIN+.
To prevent differential signal is excessive from the first conditioning circuit 22 being caused to damage, between differential signal both ends two in parallel it is anti-
To diode D1 and diode D2, the difference of differential signal is limited within the scope of the pressure drop of single diode, diode D1
With the selection model BAT54S of diode D2.
The first singlechip 21 connects two-way digital regulation resistance 222 and controls its second adjustable resistance output gain adjustment letter
Number；The second adjustable resistance is connect with differential amplifier circuit 221 adjusts its gain.
By above-mentioned structure setting, two-way digital regulation resistance 222 is provided with the second adjustable resistance, the second adjustable resistance with
Differential amplifier circuit 221 connects, and under calibration mode, the gain increase of wireless receiving second singlechip 31 refers to first singlechip 21
After order or gain reduce instruction, pass through the resistance value for changing the second adjustable resistance, adjusts the gain of differential amplifier circuit 221.
The differential amplifier circuit 221 is two-stage differential amplifying circuit, and differential amplifier circuit 221 includes positive primary amplifier
U4B, positive secondary amplifier U5B, reversed primary amplifier U4A, reversed secondary amplifier U5A；
The non-inverting input terminal of positive primary amplifier U4B is the first differential signal input SIN+；Positive primary amplifier U4B's
Inverting input terminal of the output end through the positive primary amplifier U4B of resistance R1 connection；
The non-inverting input terminal of reversed primary amplifier U4A is as the second differential signal input SIN-；Reversed primary amplifier U4A
Inverting input terminal of the output end through the reversed primary amplifier U4A of resistance R2 connection；
The non-inverting input terminal of the positive secondary amplifier U5B of the output end connection of positive primary amplifier U4B, positive secondary amplifier
Inverting input terminal of the output end of U5B through the positive secondary amplifier U5B of resistance R3 connection, the output end of positive secondary amplifier U5B are made
For the first differential signal outputs SOUT+；
The non-inverting input terminal of the reversed secondary amplifier U5A of the output end connection of reversed primary amplifier U4A；Reversed secondary amplifier
Inverting input terminal of the output end of U5A through the reversed secondary amplifier U5A of resistance R5 connection；The output end of reversed secondary amplifier U5A is made
For the second differential signal outputs SOUT-；
Inverting input terminal of the inverting input terminal of positive secondary amplifier U5B through the reversed secondary amplifier U5A of resistance R6 connection；
The inverting input terminal of positive primary amplifier U4B is also connected with the adjustable end AD_W1 of the second adjustable resistance；Second can power transformation
The inverting input terminal of the reversed primary amplifier U4A of the fixing end AD_B1 connection of resistance.
By above-mentioned two-stage differential amplifying circuit can the torque signal to foil gauge 1 sufficiently amplified, it is positive just
The non-inverting input terminal of grade amplifier U4B is the first differential signal input SIN+ connection foil gauge 1；
The non-inverting input terminal of reversed primary amplifier U4A is as the parallel zeroing half of the second differential signal input SIN- connection
Bridge circuit receives zeroed signal；
The inverting input terminal of positive primary amplifier U4B is also connected with the adjustable end AD_W1 of the second adjustable resistance；Second can power transformation
The inverting input terminal of the reversed primary amplifier U4A of the fixing end AD_B1 connection of resistance.
The resistance value for adjusting the second adjustable resistance can adjust the amplification factor i.e. gain of differential amplifier circuit 221；
The output end of positive secondary amplifier U5B is as the first differential signal outputs SOUT+；Reversed secondary amplifier U5A's
Output end is as the second differential signal outputs SOUT-；By the two output by returning to zero and the torque signal after gain process
Pass to first singlechip 21.
Reverse phase of the fixing end AD_B1 of the second adjustable resistance through the reversed primary amplifier U4A of current-limiting resistance R21 connection is defeated
Enter end；
First singlechip 21 is connected with mode selection switch S11.
To prevent 222 overcurrent damage of two-way digital regulation resistance, it will be used to adjust the of the two-way digital regulation resistance 222 of gain
Two variable resistances are used in series with resistance R21, play the role of current limliting.
Calibration mode or operational mode can be set by first singlechip 21 by mode selection switch S11, in calibration mold
Under formula, first singlechip 21 can receive the zeroing instruction of second singlechip 31, gain increase instruction, gain reduction instruction, right
The zeroing of differential amplifier circuit 221 adjusts gain.
In the operating mode, the torque signal of foil gauge 1 is only passed to second singlechip 31, signal by first singlechip 21
For one-way transmission, be conducive to the rate for improving transfer of torque signal.
The second singlechip 31 is provided with zeroing key S1, gain increases key S2, gain reduces key S3 and mould
Formula selection key S4；
Second conditioning circuit 33 includes integrated transporting discharging U8A and follows amplifier U8B；The signal output end of second singlechip 31
DAOUT is grounded through resistance R12, and signal output end DAOUT is also connected with the non-inverting input terminal of integrated transporting discharging U8A, integrated transporting discharging U8A's
Inverting input terminal is grounded through resistance R14, and the output end of integrated transporting discharging U8A is through the anti-phase input of resistance R13 connection integrated transporting discharging U8A
End；
The output end connection of integrated transporting discharging U8A follows the non-inverting input terminal of amplifier U8B, and the output end of amplifier U8B is followed to connect
The inverting input terminal for following amplifier U8B is connect, the output end of amplifier U8B is followed to export amplified torque signal.
The key S1 that returns to zero is instructed for sending zeroing, and gain increases key S2 for sending gain increase instruction；Gain subtracts
Small key S3 for send gain reduce instruction, mode selection button S4 be used for by second singlechip 31 be set to calibration mode or
Operational mode can increase instruction, gain reduction instruction to the transmission zeroing of first singlechip 21 instruction, gain in calibration mode,
It is only limitted to receive the torque signal of the transmission of first singlechip 21 in operational mode, is one-way transmission, be conducive to improve transfer of torque
The rate of signal.
Integrated transporting discharging U8A amplifies the signal output end DAOUT analog signal exported, follows amplifier U8B composition electricity
It presses follower by amplified analog signal output, reduces influence of the follow-up equipment to integrated transporting discharging U8A.
The control method of the wireless torque signal acquisition and receiving module, key are: the first singlechip
21 are provided with demarcation flow and operational process；
The demarcation flow includes the following steps:
Step A1: first singlechip 21 judges whether there is the instruction of second singlechip 31；If there is going to step A2, if do not had
Go to step A13；
Does step A2: 21 decision instruction of first singlechip belong to zeroing instruction? if so, going to step A3, turn if not
Step A7；
Step A3: first singlechip 21 saves the initial value of gain, and gain is revised as maximum by initial value by first singlechip 21
Value, i.e., set 0 for the resistance value of the second adjustable resistance for the two-way digital regulation resistance 222 for being used to adjust gain；
Step A4: first singlechip 21 acquires the first differential signal outputs SOUT+ and the second differential signal outputs
The signal of SOUT- calculates the difference of the two；
Step A5: first singlechip 21 judges whether difference is less than first threshold；If it is greater than first threshold, then two are adjusted
The resistance value of first variable resistance of railway digital potentiometer 222, and return step A4, if being not above first threshold, into
Enter step A6；
Step A6: gain recovery is initial value by first singlechip 21；Return step A1；
Step A7: 21 decision instruction of first singlechip belongs to gain increase instruction or gain reduces instruction；If it is increasing
Benefit increases instruction and goes to step A8, goes to step A10 if belonging to gain and reducing instruction；
Step A8: first singlechip 21 acquires the first differential signal outputs SOUT+ and the second differential signal outputs
The signal of SOUT-；
Step A9: if the difference of the two is greater than second threshold, it is judged as spilling, issues alarm signal, go to step A1；
Otherwise reduce the resistance value of the second adjustable resistance of two-way digital regulation resistance 222；Go to step A1；
Step A10: first singlechip 21 increases the resistance value of the second adjustable resistance of two-way digital regulation resistance 222；
Step A11: first singlechip 21 acquires the first differential signal outputs SOUT+ and the second differential signal outputs
The signal of SOUT-；
Step A12: if first singlechip 21 judges that the difference of the two is greater than second threshold, it is judged as spilling, issues
Alarm signal goes to step A10；Otherwise, A1 is gone to step；
First singlechip 21 can issue alarm signal by light emitting diode, buzzer；
Step A13: the torque signal that first singlechip 21 acquires foil gauge 1 is sent to second singlechip 31；Go to step A1；
The mode selection button S4 of the mode selection switch S11 of first singlechip 21 and second singlechip 31 are pushed into mark
Mould-fixed, calibration mode include returning to zero and adjusting two functions of gain.Under calibration mode, first singlechip 21 executes calibration stream
Journey；It is two-way communication between first singlechip 21 and second singlechip 31, second singlechip 31 will zeroing key S1, gain increase
The key-press status that key S2, gain reduce key S3 is sent to first singlechip 21, and first singlechip 21 is according to the instruction of key
The signal for being returned to zero and being adjusted gain, and acquire foil gauge 1 is sent to second singlechip 31.
First singlechip 21 then runs zeroing process after receiving zeroing instruction, exports the first conditioning circuit 22
Difference between differential signal, i.e. the first differential signal outputs SOUT+ and the signal of the second differential signal outputs SOUT- is small
In first threshold, within the allowable range, that is, return to zero successfully；
After first singlechip 21 is receiving gain adjustment instruction, including gain increase instruction and gain reduce instruction, then
Gain adjustment process is run, the differential signal for exporting the first conditioning circuit 22, i.e. the first differential signal outputs SOUT+ and the
Difference between the signal of two differential signal outputs SOUT- increases or reduces.In order to accelerate the process of gain adjustment, propose
The regulative mode of " increase+subtracting fastly slowly ".When " slow to increase " refers to that receiving gain increase instructs, if signal does not overflow, gain is only
Increase a step, if signal overflows, gain is constant；When " subtracting fastly " refers to that receiving gain reduces instruction, if signal does not have
It overflows, gain reduces a step, if signal overflows, gain can reduce always, until signal does not overflow.
Operational process includes the following steps:
Step B: the torque signal that first singlechip 21 acquires foil gauge 1 is sent to second singlechip 31.
The model selection of the mode selection switch mode selection switch S11 and second singlechip 31 of first singlechip 21 are pressed
Key S4 pushes operational mode, and first singlechip 21 executes operational process, and under operational process, first singlechip 21 only will strain
The torque signal of piece 1 passes to second singlechip 31, and signal is one-way transmission, is conducive to the rate for improving transfer of torque signal.
It is invalid that zeroing key S1, gain increase key S2, gain reduction key S3.
Preferably, first singlechip 21 acquires SOUT+ and SOUT- two-way voltage signal, calculates the difference of the two to determine
The size of the positive and negative and torque of torque.Within the interval time for sending data twice, signal, unified transmission are several times for acquisition
Wireless receiving module 3 provides more change in torque information, can acquire 4 groups of data, once be sent.
Preferably, the strain signal of reading is converted to voltage output by second singlechip 31, has versatility, is cancelled each
The incompatible communication interface of producer.Output voltage signal needs D/A converter, can use dedicated DA chip, can also adopt
With the single-chip microcontroller with DA function, the C8051F410 selected here has been internally integrated 2 12bit current mode D/A converters.In order to
The precision for improving output signal, is respectively set to maximum range and minimum range, respectively 2mA for the range of two D/A converters
And 0.25mA, parallel output, it is equivalent to the D/A converter of range 2.25mA, 15bit resolution ratio, resolution ratio improves 8 times.
Preferably, when torque dynamic change, if as soon as first singlechip 21 often receives time data, it updates primary defeated
Signal out, then output signal is ladder-like, irregularity.In order to keep output signal more smooth, then using in the data received
Multiple groups historical data output signal change curve is predicted, before receiving next data, connect according to prediction curve
Continuous output signal, while the change rate of output signal is limited, in addition hardware circuit filters, become output voltage curve smoothly
Change.It can be improved output signal ride comfort.
Described, the second wireless communication module 32 and 23 frequency of the first wireless communication module are adjustable, are provided with individual communication
Frequency range；When needing to acquire multichannel torque signal, the wireless acquisition module 2 of respective numbers is needed to be wirelessly connected with wireless receiving mould
Block 3 needs a wireless acquisition module 2 to be wirelessly connected with the pairing of wireless receiving module 3 per torque signal all the way and uses, and is arranged
For individual communications band, contention-free.The communications band of existing wireless torque sensor in the market be it is shared,
When acquiring multichannel torque signal, then signal acquisition frequency can decline at double.
Finally it should be noted that: the above enumerated are only specific embodiments of the present invention son, the technology of certain this field
Personnel can be modified to the present invention and modification, if these modifications and variations belong to the claims in the present invention and its equivalent skill
Within the scope of art, it is considered as protection scope of the present invention.
Claims (10)
1. a kind of wireless torque signal acquisition and receiving module, including foil gauge (1), which is characterized in that the foil gauge (1) is even
It is connected to wireless acquisition module (2), wireless acquisition module (2) is wirelessly connected with wireless receiving module (3)；
Wireless acquisition module (2) includes first singlechip (21), and first singlechip (21) is answered through the first conditioning circuit (22) connection
Become piece (1)；First conditioning circuit (22) sends first singlechip after the torque signal zeroing and gain process by foil gauge (1)
(21), first singlechip (21) is also connected with the first wireless communication module (23)；
Wireless receiving module (3) includes second singlechip (31), and second singlechip (31) is connected with the second wireless communication module
(32) and the second conditioning circuit (33)；Second wireless communication module (32) and the first wireless communication module (23) are wirelessly connected；
Second singlechip (31) is through first singlechip (21) remotely control the first conditioning circuit (22) zeroing and adjusting gain；
The torque signal that second singlechip (31) obtains first singlechip (21) amplifies through the second conditioning circuit (33) to be exported.
2. wireless torque signal acquisition according to claim 1 and receiving module, it is characterised in that: the wireless collection mould
Block (2) is provided with battery (24)；Battery (24) is the first conditioning circuit (22), first singlechip through the first power circuit (25)
(21) and the first wireless communication module (23) is powered；
Wireless receiving module (3) be provided with second source circuit (34), second source circuit (34) be the second conditioning circuit (33),
Second singlechip (31) and the second wireless communication module (32) power supply；
Instrument (4) is connected with computer (5) to second conditioning circuit (33) after tested.
3. wireless torque signal acquisition according to claim 1 and receiving module, it is characterised in that: the first conditioning electricity
Road (22) includes differential amplifier circuit (221) and two-way digital regulation resistance (222), and the first singlechip (21) connects two numbers
The first variable resistance that word potentiometer (222) controls two-way digital regulation resistance (222) exports zeroed signal, differential amplifier circuit
(221) the first differential signal input SIN+ connection foil gauge (1) obtains torque signal, and the of differential amplifier circuit (221)
Two differential signal input SIN- the first variable resistances of connection obtain zeroed signal；Differential amplifier circuit (221) is first poor through it
Sub-signal output end SOUT+ and second differential signal outputs SOUT- connection first singlechip (21) output torque signal.
4. wireless torque signal acquisition according to claim 3 and receiving module, it is characterised in that: the two railway digitals electricity
First variable resistance of position device (222) connects the second differential signal input SIN- through parallel zeroing half-bridge circuit；
The parallel zeroing half-bridge circuit includes resistance R40, resistance R41, resistance R42 and resistance R43, and the one of resistance R40
End connection reference voltage, through one end of resistance R41 connection resistance R42, the other end of resistance R42 is grounded the other end of resistance R40；
The common end of adjustable side AD_W2 the connection resistance R40 and resistance R41 of first variable resistance, resistance R40 and resistance R41's
Common end connects the second differential signal input SIN-；The fixing end AD_B2 of first variable resistance is grounded through resistance R43.
5. wireless torque signal acquisition according to claim 3 and receiving module, it is characterised in that: the first difference letter
The cathode of the anode of number input terminal SIN+ connection diode D1, diode D1 connects the second differential signal input SIN-；Second
The cathode of the anode of differential signal input SIN- connection diode D2, diode D2 connects the first differential signal input SIN
+；Second differential signal input SIN- is also through capacitor C11 the first differential signal input of connection SIN+.
6. wireless torque signal acquisition according to claim 4 and receiving module, it is characterised in that: the first singlechip
(21) connection two-way digital regulation resistance (222) controls its second adjustable resistance output gain adjustment signal；The second adjustable resistance with
Differential amplifier circuit (221) connection adjusts its gain.
7. wireless torque signal acquisition according to claim 6 and receiving module, it is characterised in that: the differential amplification electricity
Road (221) is two-stage differential amplifying circuit, and differential amplifier circuit (221) includes positive primary amplifier U4B, positive secondary amplifier
U5B, reversed primary amplifier U4A, reversed secondary amplifier U5A；
The non-inverting input terminal of positive primary amplifier U4B is the first differential signal input SIN+；The output of positive primary amplifier U4B
Inverting input terminal of the end through the positive primary amplifier U4B of resistance R1 connection；
The non-inverting input terminal of reversed primary amplifier U4A is as the second differential signal input SIN-；Reversed primary amplifier U4A's is defeated
Inverting input terminal of the outlet through the reversed primary amplifier U4A of resistance R2 connection；
The non-inverting input terminal of the positive secondary amplifier U5B of the output end connection of positive primary amplifier U4B, positive secondary amplifier U5B's
Inverting input terminal of the output end through the positive secondary amplifier U5B of resistance R3 connection, the output end of positive secondary amplifier U5B is as first
Differential signal outputs SOUT+；
The non-inverting input terminal of the reversed secondary amplifier U5A of the output end connection of reversed primary amplifier U4A；Reversed secondary amplifier U5A's
Inverting input terminal of the output end through the reversed secondary amplifier U5A of resistance R5 connection；The output end of reversed secondary amplifier U5A is as second
Differential signal outputs SOUT-；
Inverting input terminal of the inverting input terminal of positive secondary amplifier U5B through the reversed secondary amplifier U5A of resistance R6 connection；
The inverting input terminal of positive primary amplifier U4B is also connected with the adjustable end AD_W1 of the second adjustable resistance；The second adjustable resistance
The inverting input terminal of the reversed primary amplifier U4A of fixing end AD_B1 connection.
8. wireless torque signal acquisition according to claim 7 and receiving module, it is characterised in that: described second can power transformation
Inverting input terminal of the fixing end AD_B1 of resistance through the reversed primary amplifier U4A of current-limiting resistance R21 connection；
First singlechip (21) is connected with mode selection switch S11.
9. wireless torque signal acquisition according to claim 1 and receiving module, it is characterised in that: the second singlechip
(31) it is provided with zeroing key S1, gain increases key S2, gain reduces key S3 and mode selection button S4；
Second conditioning circuit (33) includes integrated transporting discharging U8A and follows amplifier U8B；The signal output end of second singlechip (31)
DAOUT is grounded through resistance R12, and signal output end DAOUT is also connected with the non-inverting input terminal of integrated transporting discharging U8A, integrated transporting discharging U8A's
Inverting input terminal is grounded through resistance R14, and the output end of integrated transporting discharging U8A is through the anti-phase input of resistance R13 connection integrated transporting discharging U8A
End；
The output end connection of integrated transporting discharging U8A follows the non-inverting input terminal of amplifier U8B, follow the output end of amplifier U8B connect with
With the inverting input terminal of amplifier U8B, the output end of amplifier U8B is followed to export amplified torque signal.
10. the control method of wireless torque signal acquisition and receiving module according to claim 6, it is characterised in that: institute
It states first singlechip (21) and is provided with demarcation flow and operational process；
The demarcation flow includes the following steps:
Step A1: first singlechip (21) judges whether there is the instruction of second singlechip (31)；If there is going to step A2, if do not had
Go to step A13；
Does step A2: first singlechip (21) decision instruction belong to zeroing instruction? if so, going to step A3, turn to walk if not
Rapid A7；
Step A3: gain is revised as maximum value by initial value by first singlechip (21), i.e., will be used to adjust two railway digitals of gain
The resistance value of the second adjustable resistance of potentiometer (222) is set as 0；
Step A4: first singlechip (21) acquires the first differential signal outputs SOUT+ and the second differential signal outputs SOUT-
Signal, the difference both calculated；
Step A5: first singlechip (21) judges whether difference is less than first threshold；If it is greater than first threshold, then two-way is adjusted
The resistance value of first variable resistance of digital regulation resistance (222), and return step A4, if being not above first threshold, into
Enter step A6；
Step A6: gain recovery is initial value by first singlechip (21)；Return step A1；
Step A7: first singlechip (21) decision instruction belongs to gain increase instruction or gain reduces instruction；If it is gain
Increase instruction and go to step A8, goes to step A10 if belonging to gain and reducing instruction；
Step A8: first singlechip (21) acquires the first differential signal outputs SOUT+ and the second differential signal outputs SOUT-
Signal；
Step A9: if the difference of the two is greater than second threshold, it is judged as spilling, issues alarm signal, go to step A1；Otherwise
Reduce the resistance value of the second adjustable resistance of two-way digital regulation resistance (222)；Go to step A1；
Step A10: first singlechip (21) increases the resistance value of the second adjustable resistance of two-way digital regulation resistance (222)；
Step A11: first singlechip (21) acquires the first differential signal outputs SOUT+ and the second differential signal outputs
The signal of SOUT-；
Step A12: first singlechip (21) is judged as spilling if the difference of judgement the two is greater than second threshold, issues report
Alert signal, goes to step A10；Otherwise, A1 is gone to step；
Step A13: the torque signal of first singlechip (21) acquisition foil gauge (1) is sent to second singlechip (31)；It goes to step
A1；
Operational process includes the following steps:
Step B: the torque signal of first singlechip (21) acquisition foil gauge (1) is sent to second singlechip (31).
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| 吴文明: "《传感器原理及检测技术（高职）》", 31 January 2015 * |
| 孔令宇: "《传感器检测技术实验教程》", 31 December 2007 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110530568A (en) * | 2019-10-09 | 2019-12-03 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of encapsulation integrated form stress monitoring sensor |
| CN110530568B (en) * | 2019-10-09 | 2021-01-29 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Packaged integrated stress monitoring sensor |
| CN114396909A (en) * | 2021-12-30 | 2022-04-26 | 北京铁科英迈技术有限公司 | Track height irregularity detection device and related calibration method and system |
| CN114396909B (en) * | 2021-12-30 | 2024-04-12 | 北京铁科英迈技术有限公司 | Track height irregularity detection device and related calibration method and system |
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| CN109724729B (en) | 2020-12-04 |
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