CN203298845U - Wireless real-time vehicle weight measuring system - Google Patents
Wireless real-time vehicle weight measuring system Download PDFInfo
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- CN203298845U CN203298845U CN2013203492263U CN201320349226U CN203298845U CN 203298845 U CN203298845 U CN 203298845U CN 2013203492263 U CN2013203492263 U CN 2013203492263U CN 201320349226 U CN201320349226 U CN 201320349226U CN 203298845 U CN203298845 U CN 203298845U
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Abstract
The utility model discloses a wireless real-time vehicle weight measuring system. The wireless real-time vehicle weight measuring system comprises a vehicle weight measuring device and a communication display device; the vehicle weight measuring device is composed of a pressure sensor, a signal conditioning circuit, an analog-to-digital conversion circuit, an acceleration sensor, a first wireless communication module and a vehicle weight measuring node control circuit, wherein the vehicle weight measuring node control circuit is connected with the acceleration sensor and the first wireless communication module respectively, and is connected with the pressure sensor through the analog-to-digital conversion circuit and the signal conditioning circuit; and the communication display device is composed of a second wireless communication module, a GSM communication circuit, a communication unit control circuit and an LED display, wherein the communication unit control circuit is connected with the second wireless communication module, the GSM communication circuit and the LED display respectively. With the wireless real-time vehicle weight measuring system of the utility model adopted, weight monitoring of long-distance transport vehicles as well as effective management and control of goods transport can be realized.
Description
Technical field
The utility model utility model relates to a kind of wireless real-time car weight system for measuring quantity, more specifically says a kind of wireless real-time car weight system for measuring quantity based on GSM.
Background technology
In technology of Internet of things, the interconnected data supporting that needs real-time objective in car border, car weight is one of its important parameter.Continuous expansion along with China's economic development and city size, automobile quantity increases day by day, the pressure of traffic administration is increasing, wherein to the monitoring of the weight of carrier vehicle with to effective management of freight transportation, controls, be build safety, unimpeded, green traffic in the urgent need to.
At present the weight monitoring of carrier vehicle had two kinds of methods of Static and dynamic: traditional static weighing measuring accuracy is higher, but has the shortcomings such as efficiency is low, the large mobile inconvenience of floor area.This just needs a kind of method of more high-efficiency and economic to measure the weight of carrier vehicle, and the Vehicle Driving Cycle skill of weighing is asked as a kind of intelligent weighing technology and obtained broad research and developed rapidly.Along with deepening continuously of traffic checking, transfinite improvement and weight metering charging work, the automobile dynamically weighing system has obtained application more and more widely.With regard to the on-highway motor vehicle dynamic weighing system, the speed that Dynamic Weighting precision, automobile pass through is its most important performance index, and it indicates the height of the technical merit of Highway Weigh-in-Motion Systems.At present domestic when the research and development dynamic weighing system,, because shortage is done systematic analysis to the various factors that affects automobile dynamically weighing,, to the profound processing of detection signal do, make the contradiction between dynamic weighing precision and car speed be difficult to coordinate.Often measuring accuracy is high, the passage rate that allows is just lower, when passage rate is high, measuring accuracy does not just reach requirement, and existing dynamic weighing system all is mounted in charge station at a high speed, and be difficult to carry out car weight amount monitoring for those vehicles that run on non-highway, how to realize Rapid Science ground weigh the weight of vehicle be always logistics management quantize, monitor overrun and overload whether transports and the weight metering charging that do not stop in the key issue that runs into.
The utility model content
The purpose of this utility model is to overcome the existing weak point of above-mentioned prior art, proposes a kind of can the realization to long-range carrier vehicle weight monitoring with to the effective wireless real-time car weight measuring system of managing and controlling of freight transportation.
The technical solution adopted in the utility model is as follows:
A kind of wireless real-time car weight system for measuring quantity, comprise car weight measurement mechanism and the display device of communicating by letter; Described car weight measurement mechanism is comprised of pressure transducer, signal conditioning circuit, analog to digital conversion circuit, acceleration transducer, the first wireless communication module and car weight measured node control circuit, car weight measured node control circuit is connected with acceleration transducer, the first wireless communication module respectively, and by analog to digital conversion circuit, with signal conditioning circuit, with pressure transducer, is connected; Described communication display device is comprised of the second wireless communication module, gsm communication circuit, communication unit control circuit and light-emitting diode display, and the communication unit control circuit is connected with light-emitting diode display with the second wireless communication module, gsm communication circuit respectively.
Described car weight measured node is arranged on equally distributed four strong points of automobile chassis, and a pressure transducer is installed on each strong point.
Described acceleration transducer is three axle capacitance acceleration transducers, is arranged on the axle center position.
Described pressure transducer is LOAD CELLS.
Analog-digital conversion circuit as described is the A/D TLC2543 chip of 12 bit serial.
Described car weight measured node control circuit and communication unit control circuit are the ATMEGA128 single-chip microcomputer, the clock crystal oscillator of external 16MHZ.
Described the first wireless communication module is the MAX7044 integrated circuit (IC) chip.
Described gsm communication module is the GSM/GPRS wireless module.
Compared with the prior art, the beneficial effects of the utility model are embodied in:
Car weight measured node control circuit is connected with pressure transducer with signal conditioning circuit by analog to digital conversion circuit, has completed collection, amplification and the analog to digital conversion of pressure signal, has realized the measurement of carload; Simultaneously, external three axle capacitance acceleration transducers, completed the measurement that automobile is accelerated, and realized the correction of carload measurement data; The first wireless communication module that car weight measured node control circuit is external, completed car weight measured node control circuit communication to the communication unit control circuit; Communication unit control circuit communication unit combining wireless telecommunication circuit and gsm communication circuit, utilize radio communication circuit to communicate by letter with each car weight measured node, the car weight information of each node is aggregated into the communication unit control circuit, calculate by analysis the automobile airlift, then utilize the GSM message function, the weight information of the essential information of vehicle (license plate number and car owner's essential information) and vehicle is sent to display to be shown, or be sent to control center, realized that control center carries out the purpose of Real Time Monitoring to vehicle load.
Description of drawings
Fig. 1 is the utility model car weight measurement mechanism circuit block diagram;
Fig. 2 is the utility model communication display device circuit block diagram;
Fig. 3 is pressure sensor signal conditioning unit electrical schematic diagram;
Fig. 4 is car weight measured node control circuit schematic diagram;
Fig. 5 is the gsm communication circuit theory diagrams;
Fig. 6 is the rf data receiving circuit schematic diagram of MAX1473;
Fig. 7 is communication unit control circuit schematic diagram.
Embodiment
As shown in Figure 1, 2, a kind of wireless real-time car weight system for measuring quantity, comprise car weight measurement mechanism and the display device of communicating by letter; Described car weight measurement mechanism is comprised of pressure transducer, signal conditioning circuit, analog to digital conversion circuit, acceleration transducer, the first wireless communication module and car weight measured node control circuit, car weight measured node control circuit is connected with acceleration transducer, the first wireless communication module respectively, and by analog to digital conversion circuit, with signal conditioning circuit, with pressure transducer, is connected; Described communication display device is comprised of the second wireless communication module, gsm communication circuit, communication unit control circuit and light-emitting diode display, and the communication unit control circuit is connected with light-emitting diode display with the second wireless communication module, gsm communication circuit.
The car weight measured node is arranged on equally distributed four strong points of automobile chassis, and each strong point is installed a pressure transducer, is used for measuring the weight of each point.
Acceleration transducer is three axle capacitance acceleration transducers, is used for automobile and accelerates to measure, and carries out the travel condition of vehicle judgement, as the auxiliary signal that carload is analyzed, the load-carrying data of measuring is revised.
As shown in Figure 3, pressure transducer adopts SM40 series LOAD CELLS.SM40 LOAD CELLS inside consists of Wheatstone bridge, Wheatstone bridge can suppress the impact of temperature variation, suppressing side force disturbs, can solve eaily the compensation problem of LOAD CELLS etc., the function of Wheatstone bridge is that the resistance change of strain ga(u)ge is converted to voltage signal output, and this output voltage signal is proportional to by measuring gravity.Four LOAD CELLS SM40 are evenly distributed on four strong points of automobile chassis, are responsible for the measurement of carload information.Four LOAD CELLS SM40 ranges are 20T, always are weighed as 80T, and sensitivity is 2mv/V, and precision is 0.2%, and supply voltage is 12V, and Full-span output is 24mV.Because the voltage signal after the SM40 conversion is the very little differential signal of millivolt level of amplitude, be difficult to directly carry out analog to digital conversion, therefore, signal conditioning circuit adopts the instrument amplifier AD624 of high-gain, high input resistance, low imbalance and high cmrr to carry out Signal Pretreatment.U9 in Fig. 3, U13 is AD624 instrument amplifier Zhong Deyi road pressure signal conditioning circuit (other three roads pressure signal conditioning circuit is identical) with U15.The circuit working principle: sensor bridge adopts the constant pressure source power supply, and driving voltage is 12V, and sensor Full-span output voltage range is 0～24 mV.The input voltage that requires of A/D is 0～2.5V, so consider the output signal of sensor is amplified in 0～2.5V scope, putting too multiple is 104 times, but while considering Dynamic Weighting, the dynamic peak value of automobile may carry greater than the automobile static shaft, therefore enlargement factor is 80 times, consider simultaneously the circuit that zero-suppresses, therefore adopt the two-stage amplifying circuit.The adjustable resistance of amplifying circuit and R14, R29 all adopt the high-accuracy resistance of low-temperature coefficient.U13 adopts the differential amplifier circuit structure, and enlargement factor is adjusted into 40 times by W11, sends into after U15 amplifies 2 times and outputs to 12 bits serial A/D TLC2543 after the low-pass filter filtering of the 50HZ that the signal of U13 output consists of R25 and C27.Due to the variable-resistance imbalance of sensor and installation unbalance stress, need carry out zero correction to each sensor output, wherein W2 is used for returning to zero, and W7 is used for transferring the enlargement factor of the second level.
As shown in Figure 4, car weight measured node control circuit adopts 8 single chip computer AT MEGA128 of AVR, the clock crystal oscillator of the external 16MHZ of ATMEGA128, the 5V reference data voltage that the external LM317 of inner A/D reference voltage AREF provides.Be furnished with jtag interface J1, facilitate system debug.The external analog to digital conversion circuit of ATMEGA128.Analog to digital conversion circuit adopts the A/D TLC2543 of 12 bit serial, pass through IO mouth PA3, PA4, PA5, PA6 and the PA7 of ATMEGA128 are connected respectively to CS, DO, DI, CLK and the EOC of TLC2543, ATMEGA128 simulates the serial sequential of TLC2543 by IO, realize the analog to digital conversion of pressure simulation signal.The REF+ of TLC2543 and the external LM336-2.5 of REF-pin, for it provides the reference voltage of 2.5.J5 is used for connecting the 8 road analog inputs of TLC2543, and wherein A/D_IN0 is connected with the A/D_IN0 in Fig. 3.
According to pressure-voltage relationship of LOAD CELLS SM40, the enlargement factor of modulate circuit, ATMEGA128 carries out scale transformation to the digital signal of pressure, obtains actual carload.Due to automobile in the process of moving can be repeatedly acceleration, slow down or jolt, this can make between the carload data of measurement and actual weight certain error, ATMEGA128 profile acceleration sensor MMA7260 for this reason, MMA7260 is three axle capacitance acceleration transducers of Freescale company, this miniature acceleration sensor has merged signal condition, single pole low-pass filter and technique for temperature compensation, and four kinds of acceleration analysis scopes are provided, be respectively: ± 1.5 g, ± 2 g, ± 4 g and ± 6 g.JR2 and JR3 are used for configuring the state of G1 and G2 pin, and the utility model is with 2, the 3 pin short circuits of JR2 and JR3, and G1 and G2 are configured to " 00 ", select to accelerate range ± 1.5 g.This moment, MMA7260 was in the situation of testing standard position, and the output voltage of its x axle and y axle is 0.45～2.85 V, and the output voltage of z axle is 1.25～3.65 V., because MMA7260 has adopted switching capacity filter in inside, there is clocking noise to produce, so need to meet respectively RC wave filter (R8, C8 at XOUT, YOUT and three output terminals of ZOUT of MMA7260; R9, C9; R10, C10).The analog quantity of MMA7260 output after RC filtering, is input to analog input channel ADC0, ADC1 and the ADC2 of A/D of the inside of ATMEGA128, completes analog to digital conversion.Thus, ATMEGA128 can judge the running status of automobile according to the acceleration figure of three axles, then the carload of its measurement is revised.
The first wireless communication module adopts large scale integrated chip MAX7044.MAX7044 is based on the VHF/UHF emitter chip of crystal oscillator PLL, emission OOK/ASK data in 300 MHz～450 MHz frequency ranges, and data rate reaches 100 kbps, output power+13 dBm (50 Ω load).The clock crystal oscillator of the external 13.555MHZ of MAX7044, provide 433MHZ carrier frequency (pass of reference frequency and carrier frequency is fXTAL=fRF/32).L1, L2, C1, C2 and C3 have formed antenna matching network, by optimizing these parameters, can, with output impedance 125 Ωs of the antenna matching of specified impedance to the MAX7044 power amplifier,, to suppress harmonic wave, improve the usefulness of antenna.MAX7044 is set to the ASK modulation system and carries out Data Modulation, the output data of AVR single-chip microcomputer are directly inputted to the data input pin end (leads ends 6 of MAX7044 by IO pin PB5, DATA), MAX7044 can pass through clock output pin end (leads ends 5, CLKOUT), it is the PB6 pin of the clock signal of fxTAL/16 to the AVR single-chip microcomputer that frequency is provided, and output frequency CLKOUT is used for providing the time sequential routine to ATMEGA128.
As shown in Figure 5, the gsm communication circuit in the communication display device consists of power module and gsm module.Gsm module adopts the GSM/GPRS wireless module M22 of BENQ, support the EGSM900MHz frequency range, support the GSM/GPRS function, support that GPRS CLASS 4(is downstream rate 42.8Kbps, speed uplink 21.4Kbps), M22 is built-in embedded TCP/IP, transparent and non-transparent transmission that can the supported data business.The communication data interface is that the UART level is the TTL/CMOS level, and baud rate is the self-adaptation baud rate of 300 ~ 115200bps of nominal, and module is identified automatically.U7 is the SIM card of 3V, and the M22 module is supported outside SIM card, can be directly and 3.0V SIM cartoon letters, and automatically monitor and adapt to the SIM Card Type.M22 communicates by letter with the ATMEGA128 that Fig. 7 communication unit control circuit adopts by half serial ports, and J6 is the communication interface of M22 and AVR, and the RXD of M22, TXD and GND are connected to J6 and form half serial ports, with the asynchronous serial communication interface connection of middle ATMEGA128.The PWON of M22 is connected to No. 1 pin of J6,, by the I/O mouth PE2 control of ATMEGA128 single-chip microcomputer, under the condition that normally powers on, gives the PWON pin low level that continues 120 milliseconds, and M22 starts to start.Can start M22 by by starting button START K2 during test, during the system normal operation, PWON drags down 120 milliseconds of control M22 of PWON startup by the I/O mouth PE2 of ATMEGA128 single-chip microcomputer.After starting, ATMEGA128 sends " AT " instruction to module,, if module is returned to " OK ", shows also that module normally starts and started, and can measure the PWM waveform at the BU of M22 pin simultaneously.ATMEGA128 has sent the AT order about about 10 seconds to M22, and LED lamp D2 can, with the frequency scintillation of 500 milliseconds, show that M22 has found the SIM card; Can ATMEGA128 judge by following AT instruction, AT+COPS? show and do not find the SIM card if rreturn value is 0,0, otherwise found the SIM card.
After startup, ATMEGA128 uses the AT order to control M22 the second wireless communication module and sends SMS message by the GSM network.The AT instruction is with AT beginning,＜CR〉＜LF〉specific character string of ending, the letter and number of AT heel shows the concrete function of AT instruction.Control to short message has three kinds of Mode B lock Mode, based on the PDU Mode of AT instruction with based on the Text Mode of AT instruction.The utility model adopts the PDU Mode based on the AT instruction, and the content of short message of PDU coding can be word, sound or image, and the data file that ATMEGA128 will transmit sends and transmits after the PDU coding.
The M22 supply voltage is DC3.3 ~ 4.2 V, and the power consumption of gsm module has unsettled characteristics, under holding state, average current is not more than 6 milliamperes, and under talking state, average current is the 230-260 milliampere, under the GPRS state, maximum current drain is not more than 250 milliamperes.Because the current drain of module is the form of pulse, so the peak point current of module consumption can reach 1.7A at most.Voltage-releasing voltage stabilizer adopts LM2676S-ADJ to realize DC-DC conversion, change the 9V DC voltage of outside input into 4.2V output, power to gsm module, and at the power unit of gsm module, add larger coupling capacitance C16 and less filter capacitor C17, C18, C19 and C20, with the impact of the large peak point current of cancellation module.
Fig. 6 is the rf data receiving circuit of MAX1473, MAX1473 is a fully-integrated, low-power consumption, CMOS superheterodyne receiver, have 114dBm to 0dBm input reference signal, suppress higher than the mirror image carrier wave of 50dB, amplitude keying (ASK) data-signal that is used for receiving 300MHz to 450MHz frequency range is ideal.Receive signal and amplify, be sent to the signal input part of MAX1473, the output of section's decoding within it through MAX2640 after B3721 filtering.The RXD1 pin of ATMEGA128 in decoded output signal DATAOUT connection layout 7.
Fig. 7 is that the communication unit control circuit adopts the ATMEGA128 single-chip microcomputer, is furnished with jtag interface J1, facilitates system debug.By the RT12864 liquid crystal display of the external 128*64 of J3, in order to the display automobile weight information.Wherein J4 is the interface of ATMEGA128 and gsm communication, J6 corresponding be connected (pin number is corresponding) in J4 and Fig. 5.The data that ATMEGA128 will transmit after the PDU coding, are controlled the M22 wireless module by the AT order and are sent SMS message by the GSM network, and concrete steps are as follows:
(1) ATMEGA128 arranges serial ports, comprises baud rate: 9600, and data bit: 8, parity check bit: nothing, position of rest: 1;
(2) open serial ports;
(3) check gsm module: whether normal by AT instruction testing gsm module; Check by AT+CPIN+CPIN:READY whether SIM card is effective; By AT+COPS 0,0, whether " CMNET " checking module has found network.If it is out of question that gsm module checks, entered for (4) step, otherwise, the end data transmission;
(4) input data, data layout: registration number-car owner's essential information-carload data, it is carried out the short message coding according to the PDU Mode based on the AT instruction, generate the PDU data;
(5) send data by the AT instruction;
(6) close serial ports, finish communication.
Claims (8)
1. a wireless real-time car weight system for measuring quantity, is characterized in that: comprise car weight measurement mechanism and the display device of communicating by letter; Described car weight measurement mechanism is comprised of pressure transducer, signal conditioning circuit, analog to digital conversion circuit, acceleration transducer, the first wireless communication module and car weight measured node control circuit, car weight measured node control circuit is connected with acceleration transducer, the first wireless communication module respectively, and by analog to digital conversion circuit, with signal conditioning circuit, with pressure transducer, is connected; Described communication display device is comprised of the second wireless communication module, gsm communication circuit, communication unit control circuit and light-emitting diode display, and the communication unit control circuit is connected with light-emitting diode display with the second wireless communication module, gsm communication circuit respectively.
2. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: described car weight measured node is arranged on equally distributed four strong points of automobile chassis, and a pressure transducer is installed on each strong point.
3. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: described acceleration transducer is three axle capacitance acceleration transducers.
4. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: described pressure transducer is LOAD CELLS.
5. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: analog-digital conversion circuit as described is the A/D TLC2543 chip of 12 bit serial.
6. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: described car weight measured node control circuit and communication unit control circuit are the ATMEGA128 single-chip microcomputer, the clock crystal oscillator of external 16MHZ.
7. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: described the first wireless communication module is the MAX7044 integrated circuit (IC) chip.
8. a kind of wireless real-time car weight system for measuring quantity according to claim 1, it is characterized in that: described gsm communication module is the GSM/GPRS wireless module.
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| CN2013203492263U CN203298845U (en) | 2013-06-18 | 2013-06-18 | Wireless real-time vehicle weight measuring system |
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| CN2013203492263U CN203298845U (en) | 2013-06-18 | 2013-06-18 | Wireless real-time vehicle weight measuring system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104881985A (en) * | 2015-05-28 | 2015-09-02 | 仲恺农业工程学院 | Electronic scale wireless intelligent transmission method, system and equipment applied to Internet of things |
| CN105588634A (en) * | 2015-11-30 | 2016-05-18 | 蚌埠大洋传感系统工程有限公司 | Power-saving wireless transmitter for weighing sensor |
| CN113119726A (en) * | 2021-04-25 | 2021-07-16 | 宝能(广州)汽车研究院有限公司 | Vehicle driving safety monitoring method, device, equipment and storage medium |
| CN114563072A (en) * | 2022-03-15 | 2022-05-31 | 南京邮电大学 | Vehicle-mounted high-precision real-time weighing device convenient to disassemble and assemble |
| WO2023173744A1 (en) * | 2022-03-15 | 2023-09-21 | 南京邮电大学 | Comprehensive high-precision intelligent real-time vehicle weighing method and system |
-
2013
- 2013-06-18 CN CN2013203492263U patent/CN203298845U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104881985A (en) * | 2015-05-28 | 2015-09-02 | 仲恺农业工程学院 | Electronic scale wireless intelligent transmission method, system and equipment applied to Internet of things |
| CN105588634A (en) * | 2015-11-30 | 2016-05-18 | 蚌埠大洋传感系统工程有限公司 | Power-saving wireless transmitter for weighing sensor |
| CN113119726A (en) * | 2021-04-25 | 2021-07-16 | 宝能(广州)汽车研究院有限公司 | Vehicle driving safety monitoring method, device, equipment and storage medium |
| CN114563072A (en) * | 2022-03-15 | 2022-05-31 | 南京邮电大学 | Vehicle-mounted high-precision real-time weighing device convenient to disassemble and assemble |
| WO2023173744A1 (en) * | 2022-03-15 | 2023-09-21 | 南京邮电大学 | Comprehensive high-precision intelligent real-time vehicle weighing method and system |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131120 Termination date: 20160618 |