CN108827615A - The plug force measuring system of automobile-used connector - Google Patents
The plug force measuring system of automobile-used connector Download PDFInfo
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- CN108827615A CN108827615A CN201810680431.5A CN201810680431A CN108827615A CN 108827615 A CN108827615 A CN 108827615A CN 201810680431 A CN201810680431 A CN 201810680431A CN 108827615 A CN108827615 A CN 108827615A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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Abstract
The plug force measuring system of automobile-used connector is related to connector contact engaging and separating force fields of measurement.The present invention be in order to solve the problems, such as it is existing lack automobile connector contact performance is detected.Connector setting is on connector plug telecontrol equipment, connector plugs telecontrol equipment, for realizing the Plug Action of connector, force snesor setting is on connector plug telecontrol equipment, the plug force signal of the connector on real-time measurement connector Plug Action telecontrol equipment, force signal processing unit, force signal is plugged for acquiring, the signal is handled, output voltage signal, the contact engaging and separating force of connector is obtained from the voltage signal.It is used to detect the contact engaging and separating force of connector.
Description
Technical field
The present invention relates to the systems that a kind of pair of automobile connector carries out contact performance detection, belong to the measurement of connector contact engaging and separating force
Field.
Background technique
As electrical equipment is continuously increased on automobile, wire harness becomes increasingly complex, relay, connector, node and
Conducting wire bring failure has accounted for 70% of complete vehicle fault or so, therefore the contact of automotive wire bundle stacked switch and electrical connector interface
Performance is increasingly becoming automobile connector quality testing emphasis.With connector stability closely related plug patch it is insecure or
Outlet contacts are bad, gently then interfere electronic equipment running, communication line, it is heavy then cause power supply power supply extremely, key signal
It interrupts, becomes the huge hidden danger of traffic safety.
Mainly there are two aspects for the meaning of automobile-used device for measuring force control system：
(1) from auto parts and components quality point, one fixed number of certain scale can be carried out for automobile particular component
The batch detection of amount formulates one to the quality of auto parts and components to detect the quality and performance of vehicle component, then on the basis of this
Fixed index, so as to improve the quality of components.
(2), can on this basis from the angle of control system, the quality testing of extensive exploitation various products controls
System makes control system be generalized to every field, realizes the exploitation of new control system.
But existing lack the system detected to automobile connector contact performance.
Summary of the invention
The present invention be in order to solve the problems, such as it is existing lack automobile connector contact performance is detected.It now provides automobile-used
The plug force measuring system of connector.
The plug force measuring system of automobile-used connector, it includes connector plug telecontrol equipment, force snesor and force signal
Processing unit 1,
Connector setting plugs on telecontrol equipment in connector,
Connector plugs telecontrol equipment, for realizing the Plug Action of connector,
Force snesor setting is used for real-time measurement connector Plug Action telecontrol equipment on connector plug telecontrol equipment
On connector plug force signal,
Force signal processing unit 1 is handled the signal, output voltage signal, for acquiring plug force signal from this
The contact engaging and separating force of connector is obtained in voltage signal.
Beneficial effects of the present invention are：
The present invention builds an automobile-used device for measuring force control system, measures for the contact engaging and separating force of automobile connector.It is whole
A control system possesses the process of complete set：The first step carries out setting for parameters by the human-computer interaction interface of host computer
It sets, instruction is communicated to by slave computer by communication serial port, and then complete just by the sliding that slave computer circuit controls mechanical platform
Begin to configure.Then plug force data is acquired by force snesor, data-signal is acquired to reach slave computer.It is carried out again by slave computer
Data are transferred to host computer after completion processing by the Digital Signal Processing of next step upwards, then by host computer to data carry out into
The fine processing of one step, the contact engaging and separating force of last output connector.
Detailed description of the invention
Fig. 1 is the schematic illustration of the plug force measuring system of automobile-used connector described in specific embodiment one；
Fig. 2 is the circuit diagram of A/D conversion module；
Fig. 3 is the circuit diagram of clamping protective circuit；
Fig. 4 is the circuit diagram of analog signal voltage conditioning module；
Fig. 5 is the circuit diagram of PWM waveform output circuit；
Fig. 6 is direction of insertion schematic diagram when plug is inserted into；
Fig. 7 is that force analysis when plug is inserted into plugs force curve；
Fig. 8 is the circuit diagram of jtag circuit module；
Fig. 9 is the circuit diagram of serial communication modular；
Figure 10 is the circuit diagram of power supply conditioning module；
Figure 11 is the circuit diagram of reset circuit；
Figure 12 is the connector withdrawal force testing system surface chart shown on host computer；
The withdrawal force and insertion force curve that Figure 13 is.
Specific embodiment
Specific embodiment one：Present embodiment is illustrated referring to Fig.1, automobile-used connector described in present embodiment
Force measuring system is plugged, it includes that connector plugs telecontrol equipment, force snesor and force signal processing unit 1,
Connector setting plugs on telecontrol equipment in connector,
Connector plugs telecontrol equipment, for realizing the Plug Action of connector,
Force snesor setting is used for real-time measurement connector Plug Action telecontrol equipment on connector plug telecontrol equipment
On connector plug force signal,
Force signal processing unit 1 is handled the signal, output voltage signal, for acquiring plug force signal from this
The contact engaging and separating force of connector is obtained in voltage signal.
In present embodiment, the application further includes serial communication modular and jtag circuit module, and serial communication modular is used for
It transmits the instruction of host computer and receives output signal and be returned to host computer；Jtag circuit module is for emulating.
Jtag circuit module as shown in figure 8,
JTAG is that chip manufacturer is used by reserved artificial mouth to carry out test for developer, is formulated by IEEE
Specification can be detected and be scanned to hardware circuit.It is especially used in the signal processors such as FPGA, DSP, for carrying out
Artificial debugging.Wherein, XDS560 type and XDS510 type are typical JTAG emulators, and XDS560 type is selected to emulate in the present system
Device.JTAG interface circuit design is as schemed.
JTAG is scanned test by five dedicated pins, is test clock input line (TCK), test data respectively
Input line (TDI), test data output line (TDO), model selection input line (TMS) and reset input line (/TRST).Its
In ,/TRST is that optionally, test pin reset/TRST is that low level is effective.In circuit connection, pull-up resistor is connected and is believed
Number line EMU1 and EMU0 need to carry out other processing to circuit, here to keep the stability and anti-interference of entire circuit
It can be operated in such a way that pull-up resistor connects remaining port of circuit.
Serial communication modular as shown in figure 9,
SCI, that is, serial communication interface.It is asynchronous serial data transmission in 28335.In communication process, sender with connect
Debit does not need have identical clock, and both sides can be used individual clock and carry out asynchronous communication.But it needs to carry out
The extension of interface circuit, so that asynchronous data is converted to synchrodata.Has very high transmission effect in digital data transmission
Rate saves equipment consumption, and cost is then to reduce channel utilization.
The communications of slave computer and host computer are completed by SCI serial communication modular, due to the standard traffic of PC machine communication
Both level and 28335 Transistor-Transistor Logic level have a certain distance, cause chip that cannot directly be connected with PC host, that is, need to realize
Between level conversion, level translation needs special chip to complete.
Upper figure gives the schematic diagram of SCI serial communication circuit, selects MAX232 chip in experiment, parameter is：
(1) maximum input current is 1mA, is 300uA usually using electric current.
(2) transmission minimum-rate is 120kbps, is 235kbps usually using transmission rate.
(3) has the reception delay of 0.15us.
(4) minimum incoming signal level is 2.0V, and supply voltage is 3.3V at this time.
In SCI serial communication circuit connection procedure, need between ground and power supply, between 4 feet and 5 feet, 1 foot and 3 feet it
Between access capacitor, capacitance is 0.1 μ F.Meanwhile TXD, RXD pin of excuse being connected with R1IN, TIOUT.By DSP's
SCITXDA, SCIRXDA pin and T1IN, RIOUT are attached the configuration that circuit can be completed.
The SCI serial communication circuit that configuration is completed can make PC host and DSP carry out efficient, accurate data communication.
In present embodiment, the main contents of automobile connector contact engaging and separating force measurement are whether the performance of test connector accords with
Close company standard and national standard.As in socket connector plug and socket relative movement, insertion force and withdrawal force
Whether size satisfies the criteria.
When using isolation method, according to force analysis, it can be deduced that situation as shown in Figure 6.In the opposite fortune of socket and plug
When dynamic, it is assumed that plug insertion force is Fn, plug moves closer to socket under the force of insertion, and at this moment, socket and plug is also not
It contacts with each other and interaction force is not present, as Plug contact to socket and insertion force FnThan maximum static friction force fmaxWhen big, insert
Head starts to carry out to slide relatively with socket, and plug is gradually to socket internal slide, in an ideal case, when being at the uniform velocity inserted into, inserts
The frictional force that is subject to of head is：
fd=μ N
Wherein, μ is dynamic friction factor, and N is the normal pressure that plug is subject to.During insertion, insertion is gradually goed deep into, method
Increase to pressure index of redressing with the increase of insertion depth, therefore force of sliding friction fdAlso it increases with it.When plug is inserted completely
When entering socket, maximum force of sliding friction f is obtainedd.At this moment mechanical skid plateform stops operation, insertion force FnIt disappears, plug and socket are protected
Hold opposing stationary, force of sliding friction fdIt disappears.
Under simulated environment, when plug is inserted into socket, plug does linear uniform motion always, at this time force of sliding friction fdWith
Insertion force FnIt is a pair of contrary equal-sized power, the curve graph of the power of whole process, such as Fig. 7 can be depicted.It is similar
, when plug extracts socket, withdrawal force FtChange procedure and plug it is similar when being inserted into, it is only contrary.
System is integrally broadly divided into upper computer and lower computer two parts, and host computer mainly completes user and system progress is man-machine
Interactive process completes the transfer function to the control of whole system, the movement of mechanical skid plateform and information.Meeting system function
Under the premise of energy, makes the succinct close friend of system interface as far as possible, is easy to upper hand, it is user-friendly.Comprehensively consider, system selects VB soft
The exploitation at part finishing man-machine interaction interface.
This system completes the measurement of contact engaging and separating force by advanced modern digital processing technique, so comprehensive consideration system is pre-
Phase target, design objective and design requirement need to control using modern mature intelligence instrument to complete automobile-used device for measuring force
The lower computer hardware part of system.
In automobile-used device for measuring force control system, boundary's equipment carries out the cunning that motor driven completes mechanical platform in addition to controlling the outer
It is dynamic outer, it is also necessary to complete the function of A/D conversion, signal communication, and various data are carried out with complicated processing and operation, complete
Required various functions.Therefore this system is suitble to the hardware circuit part for selecting dsp chip to complete slave computer.
TMS320C2000 series DSP controller has outstanding performance, possesses good processing capability in real time, outstanding
The design structure of high-speed computation ability and Highgrade integration, therefore such chip is widely used in embedded-type control field, can be with
Realize the accurate control of stepper motor.TMS320C28x series is as one kind in TMS320C2000 chip, using 32 high property
Energy CPU has enhanced CAN interface, while internal RAM reaches 18K, and the FLASH16 with 12 128K is logical
Road has outstanding performance in terms of asynchronous and synchronous serial interface, can complete the function of high-speed multiple channel data transmission.
TMS320F2812 and TMS320F28335 has been provided with sufficient development Experience as the chip being commonly used, 2812
CPU uses improved Harvard structure, can parallel read data in one cycle, pile line operation can be carried out, had efficiently
Instruction execution efficiency.28335 on this basis, has better processing module, more advanced in data processing speed.This
System uses core chips of 28335 chips as lower computer hardware.
According to design requirement, in TMS320F28335 chip, major function and the module used are：
(1) SCI module is needed to realize the communication function between upper bottom；
(2) ADC module is needed to realize the acquisition and conversion of data；
(3) PWM module is needed to realize the transmission of pulse；
(4) other modules.Including circuit, each module power supply circuit needed for testing circuit, conditioning sensor needed for testing, again
Position circuit and JTAG artificial circuit etc..
Specific embodiment two：Present embodiment is surveyed to the contact engaging and separating force of automobile-used connector described in specific embodiment one
Amount system is described further, and in present embodiment, it includes stepper motor, two telescopic arm sum numbers that connector, which plugs telecontrol equipment,
Slide unit is controlled,
There are two telescopic arms for setting on nc sliding table, wherein a telescopic arm is fixed on nc sliding table, on the telescopic arm
It is provided with connector female, the movement of step motor control nc sliding table, so that another telescopic arm on nc sliding table is driven to move,
It is provided with connector male connector on the telescopic arm, is moved by another telescopic arm and connector male connector is inserted into connector female
In, realize the extraction and insertion of connector.
Specific embodiment three：Present embodiment is surveyed to the contact engaging and separating force of automobile-used connector described in specific embodiment one
Amount system is described further, and in present embodiment, force signal processing unit 1 includes A/D conversion module 1-1 and DSP1-2,
The analog signal is converted into digital signal, and export for acquiring plug force signal by A/D conversion module 1-1；
The model TMS320F28335 of DSP1-2,
DSP1-2 for receiving the digital signal, and is handled, the contact engaging and separating force of output connector.
Specific embodiment four：Present embodiment is illustrated referring to Fig. 2, present embodiment is to specific embodiment three
The plug force measuring system of the automobile-used connector is described further, and in present embodiment, A/D conversion module 1-1 includes
The voltage reference of the modulus conversion chip UI of model TMS320F28335, capacitor C1-C3, resistance R1 and model REF3020
Chip U2,
It is any in the 35-42 pin and 46-53 pin of the modulus conversion chip UI of model TMS320F28335
The pulling-inserting force signal output end of one pin connection force snesor,
One end of No. 55 pins connection capacitor C3 of the modulus conversion chip UI of model TMS320F28335, capacitor C3's
One end of the other end, one end of capacitor C2 and resistance R1 is all connected with power ground, and the other end of capacitor C2 connects model
No. 56 pins of the modulus conversion chip UI of TMS320F28335, the other end connection model TMS320F28335's of resistance R1
No. 57 pins of modulus conversion chip UI,
The voltage base of No. 54 pins connection model REF3020 of the modulus conversion chip UI of model TMS320F28335
The reference voltage output end of quasi core piece U2, No. 43 pins and model of the modulus conversion chip UI of model TMS320F28335
The ground terminal of the voltage reference chip U2 of REF3020 is all connected with power ground,
The input terminal of the voltage reference chip U2 of model REF3020 connects 3.3V power supply, model REF3020's
One end of the output end connection capacitor C1 of voltage reference chip U2, the other end of capacitor C1 connect power ground, model REF3020
Voltage reference chip U2 output end connection analog signal DSP1-2 signal input part.
In present embodiment, the schematic diagram of A/D modular circuit is as shown in Figure 2.When connecting circuit, circuit as needed
The explaining illustration of function and chip handbook is attached, and circuit is not connected to remaining any load, should be with the side of a 2.2 μ F
Road capacitor, which is connected, makes its ground connection；A/D circuit external has a current offset end, and port ADCRESEXT, which should connect
Ground, and be connected with the high tolerance resistance of a 22K Ω；Circuit is also equipped with low benchmark ADCL0, the port should directly with ground
It is connected.Further, since system data is huge, need to carry out the A/D conversion of multichannel.Input signal is carried out in 14 channels
Sampling uses so should retain certain port A/D as reserved, to provide the extension function of system, therefore by ADCINA0
~ADCINA7, ADCINB0~ADCINB7 port reservation.
During the work time, A/D module can be interfered there are many factor, therefore different types of error can be generated,
Including gain error, nonlinearity erron, quantization error and offset error etc., additionally due to the presence of drift phenomenon and noise,
More errors can be generated.In the ideal case, A/D module has 12 conversion accuracies, when in the presence of offset and gain error
When, conversion accuracy may reduce by 2~3, and when there is more other errors, conversion accuracy can be further decreased.Therefore,
In order to guarantee the conversion accuracy of A/D module, it is necessary to be corrected using the method for effective simplicity to the error of A/D module.
This system is corrected using error of the hardware approach to A/D module.TMS320F28335 is in digital-to-analogue conversion part
Has the selectable reference voltage of following four：3 kinds of external reference voltages are respectively 1.024V, 1.500V, 2.048V.It can lead to
The specific register pair external reference voltage of chip is crossed to be selected and set.In addition there are the internal reference of system default electricity
Pressure.The conversion accuracy of D/A converter module largely receives the influence of external reference voltage, and external reference voltage is more stable,
Then conversion accuracy is more reliable.In this system, outside reference reference voltage of the 2.048V as ADCREFIN is selected, by REF3020
Chip provides stable external reference voltage, which has the quiescent current less than 50 μ A, drifts about down to 50ppm/ DEG C.
Specific embodiment five：Present embodiment is illustrated referring to Fig. 3, present embodiment is to specific embodiment four
The plug force measuring system of the automobile-used connector is described further, and in present embodiment, it further includes clamper protection electricity
Road,
Clamping protective circuit is used to protect input voltage in 3.3V, so that A/D conversion module 1-1 is protected,
Clamping protective circuit includes Schottky diode D1-D10 and capacitor C4-C8,
The cathode of Schottky diode D1-D5 is all connected with 3.3V power supply, and the anode of Schottky diode D1 connects simultaneously
Connect the cathode of Schottky diode D6 and one end of capacitor C4, the other end of capacitor C4, the anode of Schottky diode D6, capacitor
One end of C5, the anode of Schottky diode D7, one end of capacitor C6, the anode of Schottky diode D8, capacitor C7 one end,
The anode of the anode of Schottky diode D9, one end of capacitor C8 and Schottky diode D10 is all connected with power ground,
The anode of Schottky diode D2 connects one end of capacitor C5 and the cathode of Schottky diode D7 simultaneously,
The anode of Schottky diode D3 connects one end of capacitor C6 and the cathode of Schottky diode D8 simultaneously,
The anode of Schottky diode D4 connects one end of capacitor C7 and the cathode of Schottky diode D9 simultaneously,
The anode of Schottky diode D5 connects one end of capacitor C8 and the cathode of Schottky diode D10 simultaneously,
The anode of Schottky diode D1, the anode of Schottky diode D2, Schottky diode D3 anode, Schottky
The anode of diode D4 and the anode of Schottky diode D5 are separately connected the modulus conversion chip of model TMS320F28335
Any five pins in the 35-42 pin and 46-53 pin of UI.
In present embodiment, the ADC module of TMS320F28335 includes the A/D converter and 2 in 1 12 16 channel
A 8 select 1 multi-channel switcher.Wherein A/D converter sampled simultaneously by 2 roads/retainer constitutes.16 channels be A0~A7, B0~
B7, this 16 channels both can be used as 16 channel and used, and can also be divided into independent 28 channels and carry out using having simultaneously
Standby two sequencers.The work of A/D conversion can be completed under sequential sampling mode or synchronized sampling mode.
During chip operation, it should be noted that A/D module input signal cannot be excessive, very when input signal is more than 3V
It is easily damaged A/D module, needs to limit the voltage of analog input signal, it is made to be no more than 3V.Therefore, system is devised such as figure
Clamping protective circuit is to control applied signal voltage.
Circuit is mainly made of 10 diodes and capacitor, and diode is usually used in clamping protective circuit, is believed input
Number variation it is very sensitive.The course of work of the circuit is：When the signal voltage of the end ADCINA0~ADCINA4 input is slightly larger than
When 3.3V, make five diode current flows of D1~D5, at this moment by input voltage clamper in 3.3V；When the end ADCINA0~ADCINA4 is defeated
When negative pressure occurs in the signal voltage entered, five diode current flows of D6~D10 will be made, input voltage is at this moment maintained at 0V.In this way
Just make to input analog signal voltage and is maintained at 0~3.3V, effective protection A/D module.
Specific embodiment six：Present embodiment is surveyed to the contact engaging and separating force of automobile-used connector described in specific embodiment two
Amount system is described further, and in present embodiment, it further includes PWM waveform output circuit 2,
DSP1-2 controls PWM waveform output circuit 2 and drives stepper motor and change the revolving speed of stepper motor.
Specific embodiment seven：Present embodiment is illustrated referring to Fig. 5, present embodiment is to specific embodiment seven
The plug force measuring system of the automobile-used connector is described further, and in present embodiment, PWM waveform output circuit 2 is wrapped
The electrical level transferring chip U5, pwm signal output module J6 and capacitor C10 of model SN74HC245N are included,
Two output ends of pwm signal output module J6 are separately connected the electrical level transferring chip U5 of model SN74HC245N
No. 17 pins and No. 18 pins, one end of No. 1 pin of the electrical level transferring chip U5 of model SN74HC245N, capacitor C10
It is all connected with 5V power supply, No. 19 pins of the electrical level transferring chip U5 of the other end and model SN74HC245N of capacitor C10
Power ground is all connected with,
The driving signal output of No. 12 pins connection stepper motor of the electrical level transferring chip U5 of model SN74HC245N
End,
No. 2 pins and No. 3 pins of the electrical level transferring chip U5 of model SN74HC245N are all connected with the control of DSP1-2
Signal input part.
In present embodiment, PWM waveform output module is as shown in Figure 5：
The simulation of the automobile connector course of work is realized by nc sliding table.Wherein, the movement of nc sliding table is by step
Into motor control, the movement of nc sliding table is driven when stepper motor turn, at this point, the mechanical arm on nc sliding table controls automobile
The movement of connector has thus achieved the purpose that the working environment for simulating plug and socket relative motion.Obviously, connector
The mobile accurate control for needing mechanical arm, this just proposes strict requirements to the turn of stepper motor, since stepper motor revolves
It is dynamic to be precisely controlled by Stepping Motor Subdivision Driver, need slave computer circuit to carry out accurate pulsewidth modulation, pulse width
Change the size that will affect motor subdivision driver both end voltage, and then changes the revolving speed of motor.In conclusion generating stable
PWM waveform is the key that PWM module.The circuit diagram of PWM output circuit is as shown in Figure 5.Core is needed to refer to when designing circuit
Piece handbook and motor driven handbook, provide according to handbook, need to input the level of 5V to stepper motor, it is desirable that level is up to
0.8V, and minimum high level should be 2V.During simulation connector of auxiliary working environment, need to Stepping Motor Subdivision Driver into
Row control, when controlling stepper motor, the Transistor-Transistor Logic level of chip output is 3.3V.At this point, input is lower than to the low level of 0.4V,
Output is higher than the high level of 2.4V.As can be seen that since Stepping Motor Subdivision Driver needs to input the level greater than 3.5V,
The level of 3.3V obviously can not reach requirement.It needs to carry out circuit level conversion at this time, therefore is driven in Design of Stepper Motor Subdivision
It needs to complete the level conversion of 3V to 5V using SN74HC245N here using electrical level transferring chip between dynamic device and circuit.
Specific embodiment eight：Present embodiment is surveyed to the contact engaging and separating force of automobile-used connector described in specific embodiment three
Amount system is described further, and in present embodiment, it further includes power supply conditioning module, and power supply conditioning module is used for as entire system
System power supply.
Specific embodiment nine：Present embodiment is illustrated referring to Fig. 4, present embodiment is to specific embodiment three
The plug force measuring system of the automobile-used connector is described further, and in present embodiment, it further includes analog signal electricity
Conditioning module 3 is pressed,
Analog signal voltage conditioning module is handled for the voltage to power supply conditioning module, exports stable voltage
It powers for whole system,
Analog signal voltage conditioning module includes resistance R2-R16, slide rheostat R17-R21, capacitor C9, TLC2252 fortune
Amplifier U3 and TLC2254 operational amplifier U4 are calculated,
One end of No. 1 pin connection resistance R2 of TLC2252 operational amplifier U3, the other end of resistance R2 connect electricity simultaneously
Hinder one end of R3 and No. 2 pins of TLC2252 operational amplifier U3, the other end of resistance R3, resistance R17 sliding end,
No. 4 pins, the sliding end of resistance R18, one end of resistance R7, one end of capacitor C9 and the wire jumper of TLC2252 operational amplifier U3
The ground terminal of pad J1-J5 is all connected with power ground,
The digital-to-analogue conversion output end of wire jumper pad J1-J5 is separately connected one end of resistance R16, one end of resistance R11, resistance
One end of one end resistance R6 of R8 and one end of resistance R4,
The other end of resistance R4 connects one end of No. 3 pins and resistance R17 of TLC2252 operational amplifier U3 simultaneously,
The other end of resistance R6 connects one end of resistance R18 and No. 5 pins of TLC2252 operational amplifier U3 simultaneously,
The other end of resistance R7 connects one end of No. 6 pins and resistance R5 of TLC2252 operational amplifier U3, resistance simultaneously
No. 7 pins of the other end connection TLC2252 operational amplifier U3 of R5,
The other end of capacitor C9 and No. 8 pins of TLC2252 operational amplifier U3 are all connected with 5V power supply,
The other end of resistance R8 connects the sliding end of No. 3 pins and resistance R19 of TLC2254 operational amplifier U4 simultaneously,
One end of resistance R19 and one end of resistance R9 are all connected with power ground, the other end of resistance R9 connect simultaneously resistance R10 one end and
No. 4 pins of No. 1 pin of TLC2254 operational amplifier U4, TLC2254 operational amplifier U4 connect 5V power supply,
No. 5 pins of TLC2254 operational amplifier U4 simultaneously connect the sliding end and resistance R11 of slide rheostat R20
The other end, one end of slide rheostat R20 and one end of resistance R12 are all connected with power ground, and the other end of resistance R12 connects simultaneously
The other end connection TLC2254 operation of one end of resistance R13 and No. 6 pins of TLC2254 operational amplifier U4, resistance R13 is put
No. 7 pins of big device U4,
No. 13 pins of TLC2254 operational amplifier U4 connect one end of resistance R14 and one end of resistance R15 simultaneously, electricity
Hinder No. 14 pins of the other end connection TLC2254 operational amplifier U4 of R14, the other end, the slide rheostat R21 of resistance R15
One end be all connected with power ground, the sliding end of slide rheostat R21 connects the other end and the TLC2254 operation of resistance R16 simultaneously
No. 11 pins of No. 12 pins of amplifier U4, TLC2254 operational amplifier U4 connect power ground,
The digital-to-analogue conversion output end of the power supply signal output end tie jumper pad J1-J3 of power supply conditioning module,
No. 1 pin, No. 7 pins and No. 14 pins of TLC2254 operational amplifier U4 improve mould as analog signal voltage
The power supply signal output end of block 3.
In present embodiment, in the simulation connector of auxiliary course of work, according to contact engaging and separating force size variation, obtained signal voltage
For 0~5V.Since the port ADC of TMS320F28335 chip is more fragile, the voltage of maximum allowable input is 3V.Therefore it needs
Collected analog signal voltage is handled, this function is just realized using sensor conditioning module here.Due to AD mould
Block needs to carry out multichannel collecting, shares five tunnel input signals, therefore system is put using two kinds of operations of TLC2254 and TLC2252
Big device carries out the adjusting of analog input signal.
TLC2254 the and TLC2252 chip of TI company production is manufactured using advanced LinCMOSTM technique, has full electricity
Source voltage amplitude output performance has low input bias current, low noise, output voltage swing up to positive-negative power voltage, low input
The features such as offset voltage, is usually used in the fields such as electric power gas supply, water system.
Sensor conditioning module circuit diagram is as shown in Figure 4.In the explanation of circuit design principle, emphasis is to surround
The conditioning circuit of TLC2252 design describes in detail.
According to circuit as can be seen that 5V power supply is connect with 8 foot of chip, digitally it is connect with 4 foot of chip, analog signal and core
The connection of 3 foot of piece, 2 feet of chip and the formation of 1 foot divide negative-feedback circuit.Due to the working characteristics of operational amplifier, according to empty short void
Disconnected analysis method, the mathematical connection between available out-put supply and input voltage.
Four amplifiers inside TLC2254 and two amplifier architectures inside TLC2252 are just the same, therefore connect
Method is also identical.
By consulting chip handbook, R2 selects the resistance of 30K Ω, the resistance of R4 and R3 selection 50K Ω, and R17 selects 100K
The potentiometer of Ω resistance value.Required U can be met when R2 to 30K Ωout=0.6Uin+Requirement.This completes to defeated
Enter the decaying of analog signal voltage.
Specific embodiment ten：Present embodiment is surveyed to the contact engaging and separating force of automobile-used connector described in specific embodiment nine
Amount system is described further, in present embodiment,
The voltage signal of analog signal voltage conditioning module 1-2 exports：
In formula, UoutFor output voltage, Uin+For input voltage anode, UinIt is input voltage cathode, R2 is the resistance of resistance R2
Value, R3 are the resistance value of resistance R3, and R17 is the resistance value of resistance R17, and R4 is the resistance value of resistance R4,
Work as UinWhen=0, R4=R3, R2=R17, formula 1 is simplified, obtaining output voltage is：
In present embodiment, since this system needs to be powered modules, so needing to design power management mould
Block is so that each module keeps normal operating conditions.Slave computer circuit needs to complete to Stepping Motor Subdivision Driver, circuit board electricity
The task that source and external circuit power supply are powered.
According to the supply voltage one that the design requirement of modules circuit can be seen that hardware circuit demand share 1.8V,
Tri- voltage values of 3.3V and 5V.Electronic device in circuit does not have excessive want to size of current and watt level in power supply
It asks, this system selects TPS767D301 dual voltage adjuster chip in power supply, which can provide independence as voltage-stablizer
Two-way voltage be powered, primary input voltage is 10V, and adjustable output voltage range is 1.5V~5.5V, and output electric current is
1A.In addition, at work, TPS767D301 can also provide the fixed voltage individually powered all the way, fixed voltage 3.3V.
It when designing circuit, needs to be controlled to a power supply with making with 0.1 μ F shunt capacitance, makes independence with 10 μ F filter capacitors
The fixation 3.3V voltage of output is connected to ground.The supply voltage of TPS767D301 is 5V.In another way variable range voltage output,
The calculation formula of circuitous resistance can be consulted according to chip handbook：
Wherein, it can be inquired according to chip handbook, VREFFor internal reference voltage, voltage is fixed 1.1834V；Root
According to required output voltage VoutVoltage swing the resistance value of R26 and R27 are selected.It should be noted that when the resistance value of selection
When relatively excessive, it will generate biggish leakage current, at this moment can be impacted to the normal work of chip, even result in output letter
Number mistake.And when the resistance value of selection is relatively too small, the consumption of circuit can be made to increase.In addition, R26 and R27 needs to select essence
High resistance is spent, guarantees the accuracy and stability of output voltage with this.According to chip handbook, the recommendation resistance value of R27 is 30.1K
Ω can calculate the resistance value of R26 at desired conditions according to formula.At this point, can satisfy when R26 takes 18.2K Ω required
The output voltage of 1.8V.
In addition, circuit with being designed into connection and simulation between analog power and digital power in the design process with number
Connection between word ground keeps system more stable, needs using filtering according to required index and design requirement in order to reduce interference
Capacitor reduces coupled interference, and is connected between the two using magnetic bead above-mentioned.
TPS767D301 chip can provide the output voltage that stable two-way independently exports, and can be true to output
Voltage is monitored, in addition, chip also has the function of being resetted to voltage, can be realized by external circuits, but in order to
Guarantee that reset circuit as shown in figure 11 has also been devised in the Stability and veracity of system voltage, hardware components.
Experimental verification：
In connector contact engaging and separating force measurement process, operator is needed to carry out the positioning of four points to nc sliding table, respectively
Current point A, origin B, beginning/terminating point C, switch-back point D.Its basic meaning is described as follows：
(1) current point：Operator before carrying out current-configuration experiment, connector male connector (cantilever beam sensor) it is minimum
Point.
(2) origin：Nc sliding table is adjusted to when being suitble to be initially configured experimental station, connector male connector (cantilever beam sensor)
Minimum point, this be also slide unit movement at the end of terminal.
(3) beginning/terminating point：When nc sliding table is adjusted to setting in motion, connector male connector (cantilever beam sensor)
Minimum point.
(4) switch-back point：By nc sliding table adjust to connector male connector insertion female bottom (cantilever beam sensor indentation light a cigarette
Device bottom) point, connector male connector (cantilever beam sensor) will be in beginning/carry out periodic motion between terminating point and switch-back point.
It should be noted that when system does not carry out initial work, should keep current point A and beginning/terminating point C it
Between at least keep the height of 3cm to initialize again.
It is that reference is sat with origin A after controlling the positioning of four points of slide unit movement and completion or more by upper computer software
Remaining each point relative position of target is just stored in ByteForceData array as configuration parameter.The array is joined in configuration
Number be identified after lower computer control system will be sent to by serial ports by host computer, thus realize motor position intelligence record and
The period measuring of force value signal.
System can observe the situation of change of measured signal in the current experiment period in image processing module in real time, can also
Contrast images are drawn to open historical data by document management module.Figure 13 is the history number of certain field experiment testing result
According to image, it can be seen that peak pullout load and peak insertion force are respectively 196N and 30N in this time experiment, meanwhile, cursor can
The specific force value of each point data in real-time tracing image display area.
Claims (10)
1. the plug force measuring system of automobile-used connector, which is characterized in that it includes connector plug telecontrol equipment, force snesor
With force signal processing unit (1),
Connector setting plugs on telecontrol equipment in connector,
Connector plugs telecontrol equipment, for realizing the Plug Action of connector,
Force snesor setting is on connector plug telecontrol equipment, on real-time measurement connector Plug Action telecontrol equipment
The plug force signal of connector,
Force signal processing unit (1) is handled the signal, output voltage signal, for acquiring plug force signal from the electricity
Press the contact engaging and separating force that connector is obtained in signal.
2. the plug force measuring system of automobile-used connector according to claim 1, which is characterized in that connector plugs sportswear
It sets including stepper motor, two telescopic arms and nc sliding table,
There are two telescopic arms for setting on nc sliding table, wherein a telescopic arm is fixed on nc sliding table, is arranged on the telescopic arm
There is connector female, the movement of step motor control nc sliding table, so that another telescopic arm on nc sliding table be driven to move, this is stretched
It is provided with connector male connector on contracting arm, is moved by another telescopic arm and connector male connector is inserted into connector female, it is real
The extraction and insertion of existing connector.
3. the plug force measuring system of automobile-used connector according to claim 1, which is characterized in that force signal processing unit
It (1) include A/D conversion module (1-1) and DSP (1-2),
The analog signal is converted into digital signal, and export for acquiring plug force signal by A/D conversion module (1-1)；
The model TMS320F28335 of DSP (1-2),
DSP (1-2) for receiving the digital signal, and is handled, the contact engaging and separating force of output connector.
4. the plug force measuring system of automobile-used connector according to claim 3, which is characterized in that A/D conversion module (1-1)
The voltage of modulus conversion chip UI, capacitor C1-C3, resistance R1 and model REF3020 including model TMS320F28335
Fiducial chip U2,
Any one in the 35-42 pin and 46-53 pin of the modulus conversion chip UI of model TMS320F28335
Pin connects the pulling-inserting force signal output end of force snesor,
One end of No. 55 pins connection capacitor C3 of the modulus conversion chip UI of model TMS320F28335, capacitor C3's is another
The one end at end, one end of capacitor C2 and resistance R1 is all connected with power ground, and the other end of capacitor C2 connects model
No. 56 pins of the modulus conversion chip UI of TMS320F28335, the other end connection model TMS320F28335's of resistance R1
No. 57 pins of modulus conversion chip UI,
The voltage reference core of No. 54 pins connection model REF3020 of the modulus conversion chip UI of model TMS320F28335
The reference voltage output end of piece U2, No. 43 pins and model of the modulus conversion chip UI of model TMS320F28335
The ground terminal of the voltage reference chip U2 of REF3020 is all connected with power ground,
The input terminal of the voltage reference chip U2 of model REF3020 connects 3.3V power supply, the voltage of model REF3020
One end of the output end connection capacitor C1 of fiducial chip U2, the other end of capacitor C1 connect power ground, the electricity of model REF3020
Press the signal input part of output end connection analog signal DSP (1-2) of fiducial chip U2.
5. the plug force measuring system of automobile-used connector according to claim 4, which is characterized in that it further includes clamper protection
Circuit,
Clamping protective circuit is used to protect input voltage in 3.3V, so that A/D conversion module (1-1) is protected,
Clamping protective circuit includes Schottky diode D1-D10 and capacitor C4-C8,
The cathode of Schottky diode D1-D5 is all connected with 3.3V power supply, and the anode of Schottky diode D1 connects Xiao simultaneously
The cathode of special based diode D6 and one end of capacitor C4, the other end of capacitor C4, the anode of Schottky diode D6, capacitor C5
One end, the anode of Schottky diode D7, one end of capacitor C6, the anode of Schottky diode D8, one end of capacitor C7, Xiao Te
The anode of the anode of based diode D9, one end of capacitor C8 and Schottky diode D10 is all connected with power ground,
The anode of Schottky diode D2 connects one end of capacitor C5 and the cathode of Schottky diode D7 simultaneously,
The anode of Schottky diode D3 connects one end of capacitor C6 and the cathode of Schottky diode D8 simultaneously,
The anode of Schottky diode D4 connects one end of capacitor C7 and the cathode of Schottky diode D9 simultaneously,
The anode of Schottky diode D5 connects one end of capacitor C8 and the cathode of Schottky diode D10 simultaneously,
The anode of Schottky diode D1, the anode of Schottky diode D2, the anode of Schottky diode D3, two pole of Schottky
The anode of pipe D4 and the anode of Schottky diode D5 are separately connected the modulus conversion chip UI's of model TMS320F28335
Any five pins in 35-42 pin and 46-53 pin.
6. the plug force measuring system of automobile-used connector according to claim 2, which is characterized in that it further includes PWM waveform
Output circuit (2),
DSP (1-2) controls PWM waveform output circuit (2) driving stepper motor and changes the revolving speed of stepper motor.
7. the plug force measuring system of automobile-used connector according to claim 6, which is characterized in that PWM waveform output circuit
(2) include model SN74HC245N electrical level transferring chip U5, pwm signal output module J6 and capacitor C10,
Two output ends of pwm signal output module J6 are separately connected the 17 of the electrical level transferring chip U5 of model SN74HC245N
Number pin and No. 18 pins, No. 1 pin of the electrical level transferring chip U5 of model SN74HC245N, one end of capacitor C10 connect
5V power supply is connect, No. 19 pins of the electrical level transferring chip U5 of the other end and model SN74HC245N of capacitor C10 connect
Power ground is connect,
The driving signal output end of No. 12 pins connection stepper motor of the electrical level transferring chip U5 of model SN74HC245N,
No. 2 pins and No. 3 pins of the electrical level transferring chip U5 of model SN74HC245N are all connected with the control letter of DSP (1-2)
Number input terminal.
8. the plug force measuring system of automobile-used connector according to claim 1, which is characterized in that it further includes power supply conditioning
Module, power supply conditioning module are used to power for whole system.
9. the plug force measuring system of automobile-used connector according to claim 1, which is characterized in that it further includes analog signal
Voltage conditioning module (3),
Analog signal voltage conditioning module is handled for the voltage to power supply conditioning module, and it is whole for exporting stable voltage
A system power supply,
Analog signal voltage conditioning module includes that resistance R2-R16, slide rheostat R17-R21, capacitor C9, TLC2252 operation are put
Big device U3 and TLC2254 operational amplifier U4,
One end of No. 1 pin connection resistance R2 of TLC2252 operational amplifier U3, the other end of resistance R2 connect resistance R3 simultaneously
One end and TLC2252 operational amplifier U3 No. 2 pins, the other end of resistance R3, the sliding end of resistance R17, TLC2252 fortune
Calculate No. 4 pins, the sliding end of resistance R18, one end of resistance R7, one end of capacitor C9 and the wire jumper pad J1-J5 of amplifier U3
Ground terminal be all connected with power ground,
The digital-to-analogue conversion output end of wire jumper pad J1-J5 is separately connected one end of resistance R16, one end of resistance R11, resistance R8
One end of one end resistance R6 and one end of resistance R4,
The other end of resistance R4 connects one end of No. 3 pins and resistance R17 of TLC2252 operational amplifier U3 simultaneously,
The other end of resistance R6 connects one end of resistance R18 and No. 5 pins of TLC2252 operational amplifier U3 simultaneously,
The other end of resistance R7 connects one end of No. 6 pins and resistance R5 of TLC2252 operational amplifier U3 simultaneously, resistance R5's
The other end connects No. 7 pins of TLC2252 operational amplifier U3,
The other end of capacitor C9 and No. 8 pins of TLC2252 operational amplifier U3 are all connected with 5V power supply,
The other end of resistance R8 connects the sliding end of No. 3 pins and resistance R19 of TLC2254 operational amplifier U4, resistance simultaneously
One end of R19 and one end of resistance R9 are all connected with power ground, the other end of resistance R9 connect simultaneously resistance R10 one end and
No. 4 pins of No. 1 pin of TLC2254 operational amplifier U4, TLC2254 operational amplifier U4 connect 5V power supply,
No. 5 pins of TLC2254 operational amplifier U4 connect simultaneously slide rheostat R20 sliding end and resistance R11 it is another
End, one end of slide rheostat R20 and one end of resistance R12 are all connected with power ground, and the other end of resistance R12 connects resistance simultaneously
The other end of one end of R13 and No. 6 pins of TLC2254 operational amplifier U4, resistance R13 connects TLC2254 operational amplifier
No. 7 pins of U4,
No. 13 pins of TLC2254 operational amplifier U4 connect one end of resistance R14 and one end of resistance R15, resistance R14 simultaneously
Other end connection TLC2254 operational amplifier U4 No. 14 pins, one end of the other end of resistance R15, slide rheostat R21
It is all connected with power ground, the sliding end of slide rheostat R21 connects the other end and TLC2254 operational amplifier of resistance R16 simultaneously
No. 11 pins of No. 12 pins of U4, TLC2254 operational amplifier U4 connect power ground,
The digital-to-analogue conversion output end of the power supply signal output end tie jumper pad J1-J3 of power supply conditioning module,
No. 1 pin, No. 7 pins and No. 14 pins of TLC2254 operational amplifier U4 are as analog signal voltage conditioning module (3)
Power supply signal output end.
10. the plug force measuring system of automobile-used connector according to claim 9, which is characterized in that analog signal voltage tune
The voltage signal of reason module (1-2) exports：
In formula, UoutFor output voltage, Uin+For input voltage anode, Uin-For input voltage cathode, R2 is the resistance value of resistance R2,
R3 is the resistance value of resistance R3, and R17 is the resistance value of resistance R17, and R4 is the resistance value of resistance R4,
Work as Uin-When=0, R4=R3, R2=R17, formula 1 is simplified, obtaining output voltage is：
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810680431.5A CN108827615A (en) | 2018-06-27 | 2018-06-27 | The plug force measuring system of automobile-used connector |
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| CN201810680431.5A CN108827615A (en) | 2018-06-27 | 2018-06-27 | The plug force measuring system of automobile-used connector |
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