CN101075374A - Apparatus for realizing low-consumption wireless monitor - Google Patents
Apparatus for realizing low-consumption wireless monitor Download PDFInfo
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Abstract
A device used for realizing radio monitor in low energy consumption mode is prepared as triggering transducer to collect signal by data-processing module according to period preset by itself, calculating value of collected signal and comparing calculated value result with preset alarm value, storing said value result and setting data-processing module to be on dormant state if said value result is less than said alarm value or otherwise triggering up radio communication module to transmit all collected values to central gateway by data-process module then setting data processing module continuously to be on dormant state.
Description
Technical field
The present invention relates to the wireless monitor technology, particularly a kind of device of realizing low-consumption wireless monitor.
Background technology
Sensor is widely used in the monitoring field, mode by online permanent sensor installation or regular visit on the key position of plant equipment, bridge, buildings etc., obtain monitoring key position or equipment operation condition parameter, monitoring key position or equipment operation condition carry out Analysis on Fault Diagnosis or warning.
For to patrol and examine the mode of monitoring, need the monitoring personnel regularly to carry prison trial work tools such as sensor, at the scene to a plurality of monitoring points sensor installation, gather one by one, then the information of gathering is write down and takes back and analyze and handle.This mode needs the monitoring personnel to possess certain relevant knowledge; And, for the field data collection with a lot of monitoring points, finishing once comprehensively to patrol and examine then needs to spend the long time, and therefore all period interval of patrolling and examining can not be too short, thereby can not obtain the comprehensive operating state data in monitoring point, be not suitable for carrying out the more situation in monitoring point.
For the mode of online permanent sensor installation, sensor is fixed on key position or the equipment, and to Surveillance center, Surveillance center carries out monitoring analysis and processing to the signal of gathering to acquired signal again by cable transmission.Therefore, need between monitoring scene and Surveillance center, lay cable,, need handle by cable being carried out trench in industry spot as industrial machinery is monitored; For bridge or buildings, then need pre-buried transmission cable in the construction stage.This mode, the field wiring construction is complicated, needs the cable of One's name is legion, and sensor is installed extremely inconvenient; And, in case sensor and cable installation are difficult to increase or change the monitoring point; Simultaneously, the signal of sensor acquisition is a simulating signal, is not suitable for long Distance Transmission, is interfered easily, influences measuring accuracy, produces wrong report.
In order to solve the Sensor Analog Relay System signal transmission issues, commonly used improving one's methods be, by adopting optical fiber, technology such as bus increase signal transmission distance, but this can not save transmission cable fully.
Development along with wireless technology, utilize Radio Transmission Technologys such as bluetooth, WI-FI, data radio station at present, by adopting the wireless network transmissions sensor signal, saved the cable of field wiring effectively and the cable wiring manufacture of cable complexity has been handled, but meanwhile, because the some shortcomings that Radio Transmission Technologys self such as bluetooth, WI-FI, data radio station exist,, poor anti jamming capability big as power consumption, network capacity is little, extension of network is relatively poor, cost is high, is not suitable for comprising that the wireless sensor network of large-scale sensor uses.
Summary of the invention
In view of this, a fundamental purpose of the embodiment of the invention is to provide a kind of device of realizing low-consumption wireless monitor, reduces the power consumption in the wireless monitor.
For achieving the above object, the embodiment of the invention provides a kind of device of realizing low-consumption wireless monitor, and this device comprises: sensor, data conditioning acquisition processing module, wireless communication module and power module, wherein,
Sensor according to the trigger pip of data conditioning acquisition processing module output, is gathered monitoring point information, and is exported acquired signal to the data conditioning acquisition processing module;
The data conditioning acquisition processing module is used for being undertaken by the predefined cycle triggering of self, and to sensor output trigger pip, triggers the sensor acquisition signal; The acquired signal of receiving sensor output, acquired signal is nursed one's health filtering, over-sampling analog to digital conversion, digital signal processing and numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared, if be not more than the alarming value of setting, after the result that numerical evaluation is obtained stores self is placed dormant state; If the result that numerical evaluation obtains is greater than predefined alarming value, or the described trigger pip number of times of exporting to sensor reaches preset value, and the output trigger pip triggers wireless communication module and exports the result that numerical evaluation obtains to wireless communication module;
Wireless communication module, adopt the IEEE802.15.4 standard to transmit, trigger pip according to the output of data conditioning acquisition processing module, the result that the numerical evaluation of reception data conditioning acquisition processing module output obtains, be sent to outside center gateway or router, the controlled variable that receiving center gateway or router send, export the data conditioning acquisition processing module to, described predefined cycle of data conditioning acquisition processing module and preset value are upgraded, after finishing reception and transmission task, change dormant state over to;
Power module is used to provide the operating voltage of sensor, data conditioning acquisition processing module and wireless communication module.
Preferably, described data conditioning acquisition processing module comprises conditioning filtering submodule, main processing sub and timing submodule, wherein,
Conditioning filtering submodule triggers according to the trigger pip of main processing sub output, is used for the acquired signal filtering with sensor output, obtains the required bandwidth of monitoring, will nurse one's health filtering after signal export main processing sub to;
Main processing sub, according to the predefined cycle triggering of timing submodule, be used for signal to the output of conditioning filtering submodule carry out analog to digital conversion and will change after signal carry out numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared, if be not more than predefined alarming value, value storage be placed on dormant state; If greater than predefined alarming value or the described trigger pip number of times of exporting to sensor reaches preset value, the output trigger pip triggers wireless communication module and exports the result that numerical evaluation obtains to wireless communication module;
The timing submodule, be used for triggering main processing sub by the predefined cycle, and the result who obtains when numerical evaluation reaches preset value greater than predefined alarming value or the described trigger pip number of times of exporting to sensor, and the output trigger pip triggers wireless communication module.
Preferably, described sensor is a micro electro-mechanical systems acceleration sensor, or piezoelectric acceleration sensor, or the electric charge acceleration transducer, or the built-in circuit piezoelectric acceleration sensor.
Described conditioning filtering submodule comprises the capacitance-resistance device, and the trigger pip that is used to receive main processing sub output triggers; With the acquired signal filtering of sensor output, obtain the required bandwidth of monitoring, will nurse one's health filtering after signal export main processing sub to;
Described conditioning filtering submodule comprises that further electric charge amplifies change-over circuit, is used for output with sensor and is converted to voltage signal and amplifies.
Described conditioning filtering submodule comprises the capacitance-resistance device, and the trigger pip that is used to receive main processing sub output triggers; With the acquired signal filtering of sensor output, obtain the required bandwidth of monitoring, will nurse one's health filtering after signal export main processing sub to;
Described conditioning filtering submodule further comprises constant-current circuit, and being used for provides the constant current source excitation to sensor.
Preferably, described conditioning filtering submodule is single order resistance capacity filter or 2 to 8 rank butterworth filters.
Described conditioning filtering submodule comprises joins resistor bridge and bridge circuit driving voltage circuit, wherein,
Join resistor bridge, be used for the acquired signal of sensor output is converted to voltage signal, acquired signal according to the sensor output that receives changes the variation that causes self-resistance, makes to flow through this electric current of joining resistor bridge two arms and change output and the proportional voltage signal of resistance variations;
Bridge circuit driving voltage circuit, the trigger pip that is used to receive main processing sub output triggers, and provides constant driving voltage for joining resistor bridge;
Described conditioning filtering submodule further comprises amplifier, is used to receive the voltage signal of joining resistor bridge output, amplifies, and exports main processing sub to.
Preferably, described sensor is a temperature sensor, or strain transducer, or displacement transducer, or pressure transducer.
Preferably, described main processing sub comprises A/D analog to digital converter and numerical evaluation device, wherein,
The A/D analog to digital converter is used for the signal of conditioning filtering submodule output is carried out analog to digital conversion, exports the numerical evaluation device to;
The numerical evaluation device is used for the digital signal after the analog to digital conversion is carried out numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared.
Preferably, the sampling rate of described A/D analog to digital converter is not less than 10 times of the effective frequency of utilization scope of sensor.
Preferably, described main processing sub further comprises digital filter, is used for the digital signal after the analog to digital conversion is carried out digital filtering, further removes the interference that front end conditioning filtering submodule is brought into, exports the numerical evaluation device to.
Described digital filter is for there being limit for length's impact response filter.
Preferably, described main processing sub further comprises one or more integration submodules, is used for the signal behind analog to digital conversion or the digital filtering is carried out the one or many integration.
Described data conditioning acquisition processing module further comprises one or more integration submodules, is used for the signal of conditioning filtering submodule output is carried out the one or many integration.
Described wireless communication module network topology structure is Star Network, point to point network, bunch shape tree or mesh network, adopts the wireless protocols of IEEE802.15.4 standard to carry out data transmission.
Preferably, described wireless communication module further comprises radio-frequency power amplifier and/or low noise amplifier, is used for receiving and transmitting signal power is amplified.
Preferably, the dual-mode antenna of described wireless communication module is PCB antenna or paster antenna or whip antenna.
Preferably, the DC voltage that described power module provides is 3V or 3.3V, 2.5V, 1.8V or 5V.
Described power module is a miniature vibration electric generator, and the vibrational energy that utilizes the piezoelectric principle collection structure to produce is converted into electric weight and is stored in the electric capacity, or is solar cell, and to be used for conversion of solar energy be electric energy and be stored in the electric capacity.
As seen from the above technical solutions, the device of realization low-consumption wireless monitor provided by the invention, the data conditioning acquisition processing module triggers the sensor acquisition signal according to the predefined cycle, finish data acquisition and over-sampling analog to digital conversion and digital signal processing and numerical evaluation, result and predefined alarming value that respective value is calculated compare, if be not more than predefined alarming value, after then the result that numerical evaluation is obtained stores self is placed dormant state; If the result that numerical evaluation obtains is greater than predefined alarming value, or the trigger pip number of times of exporting to sensor reaches preset value, the data conditioning acquisition processing module triggers wireless communication module, wireless communication module adopts the IEEE802.15.4 standard to transmit, all numerical value of gathering are transferred to center gateway or router, inquire that simultaneously center gateway or router have the controlled variable that need not send, if have, the controlled variable that receiving center gateway or router send, export the data conditioning acquisition processing module to, data conditionings predefined cycle of acquisition processing module and preset value are upgraded, after finishing reception and transmission task, continue to enter dormant state, have following advantage:
(1) do not need transmission cable fully, easy to install;
(2) sensor output analog signal transmission is apart from weak point, through analog to digital conversion, wireless transmission be digital signal, antijamming capability is strong;
(3) the data conditioning acquisition processing module adopts oversampling technique, and digital signal is carried out effective digital filtering, has further strengthened antijamming capability;
(4) each module adopts the super low-power consumption design, places dormant state when not working, and has low-down current drain, uses two joint general dry batteries to work several years, and maintenance period prolongs greatly, has reduced maintenance cost;
(5) wireless transmission satisfies the IEEE802.15.4 standard, and the transmission reliability height can be formed huge wireless sensor network;
(6) can use miniature vibration electric generator, the weak vibration energy that utilizes the piezoelectric principle collection structure to produce is converted into electric weight and is stored in the electric capacity, also can use solar cell, for each module provides power supply, accomplishes real non-maintaining.
Description of drawings
Fig. 1 realizes the apparatus structure synoptic diagram of low-consumption wireless monitor for the embodiment of the invention.
Fig. 2 is the apparatus structure synoptic diagram that the embodiment of the invention one realizes low-consumption wireless monitor.
Fig. 3 is the apparatus structure synoptic diagram that the embodiment of the invention two realizes low-consumption wireless monitor.
Fig. 4 is the apparatus structure synoptic diagram that the embodiment of the invention three realizes low-consumption wireless monitor.
Fig. 5 realizes the method flow synoptic diagram of low-consumption wireless monitor for the embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with the accompanying drawings and the specific embodiments.
The device of the realization low-consumption wireless monitor that the embodiment of the invention provides, mainly be to trigger the sensor acquisition signal according to the predefined cycle by the data conditioning acquisition processing module, finish data acquisition and over-sampling analog to digital conversion and digital signal processing and numerical evaluation, with and result and predefined alarming value that numerical evaluation obtains compared, if be not more than predefined alarming value, continue to get back to dormant state after result's storage that numerical evaluation is obtained; If greater than predefined alarming value or the trigger pip number of times of exporting to sensor reaches preset value, the data conditioning acquisition processing module triggers wireless communication module, and the result that wireless communication module obtains numerical evaluation radios to center gateway or router.Because transmission is digital signal, has improved the antijamming capability of signal; Each module is selected the components and parts of super low-power consumption for use, and has adopted regularly trigger mechanism, makes each module when not working, and is in dormant state, thereby has reduced the power consumption of each module.
Referring to Fig. 1, Fig. 1 is the apparatus structure synoptic diagram of embodiment of the invention realization low-consumption wireless monitor, and this device comprises: sensor 10, data conditioning acquisition processing module 11, wireless communication module 12 and power module 13;
Data conditioning acquisition processing module 11 is responsible for being undertaken by the predefined cycle triggering of self, and to sensor 10 output trigger pips, is triggered sensor 10 acquired signal; The acquired signal of receiving sensor 10 outputs, acquired signal is nursed one's health filtering, over-sampling analog to digital conversion, digital signal processing and numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared, if be not more than predefined alarming value, after then the result that numerical evaluation is obtained stores self is placed dormant state, wait for the triggering of next time; If the result that numerical evaluation obtains reaches preset value greater than predefined alarming value or the trigger pip number of times of exporting to sensor, then export trigger pip and trigger wireless communication module 12, and export the result that numerical evaluation obtains to wireless communication module 12.
Based on Fig. 1,, be elaborated in the device of realizing low-consumption wireless monitor, using the specific embodiment of the present invention below for three embodiment.
Embodiment one:
Fig. 2 is the apparatus structure synoptic diagram that the embodiment of the invention one realizes low-consumption wireless monitor.Referring to Fig. 2, this device comprises: sensor 10, data conditioning acquisition processing module 11, wireless communication module 12 and power module 13, wherein,
In the practical application, sensor 10 can be the vibration acceleration sensor that buildingss such as plant equipment or bridge is carried out vibration monitoring, as MEMS (micro electro mechanical system) (MEMS, Micro Electron MechanicalSystem) acceleration transducer, or piezoelectric acceleration sensor, or other type such as electric charge or built-in circuit piezoelectricity (ICP, Integrated-Circuit Piezoelectric) acceleration vibration transducer; Can also be temperature sensor, strain transducer, displacement transducer and the pressure transducer that carries out temperature, strain, displacement or pressure monitoring.Sensor output becomes the voltage signal of equal proportion with the monitoring physical quantity.
In the present embodiment, sensor 10 is selected vibration acceleration sensor for use, in order to reduce power consumption, sensor 10 can further be selected the product of super low-power consumption for use, as productions such as AD company, FREESCALE company, MSI company be suitable for low frequency monitoring have zero-frequency response, low in energy consumption, volume is little, cost is low MEMS or a piezoelectric acceleration sensor chip series product, provide power supply by power module 13, its output is connected to data conditioning acquisition processing module 11.The sensor chip sleep pin is connected to data conditioning acquisition processing module 11 control ends, inserts park mode by data conditioning acquisition processing module 11 when not gathering.
Data conditioning acquisition processing module 11 comprises conditioning filtering submodule 21, main processing sub 24 and timing submodule 25, wherein,
In the present embodiment, conditioning filtering submodule 21 adopts the single order resistance capacity filter, obtains the required bandwidth of monitoring by regulating the capacitance-resistance value; Also can adopt the butterworth filter on 2 to 8 rank, the signal of input filter is carried out anti-aliasing filter.
If sensor 10 is the electric charge acceleration transducer, then nurse one's health and also comprise electric charge amplification change-over circuit (not shown) in the filtering submodule 21, the output of sensor 10 is converted to voltage signal and amplifies, just the quantity of electric charge that comprises in the acquired signal with sensor 10 outputs is changed.
A/D analog to digital converter 240,12 A/D that can use main processing sub 24 to carry, higher if desired conversion accuracy also can be used 16 or 24 A/D chips of low-power consumption, is not carrying out placing park mode analog-to-digital the time.In the present embodiment, A/D analog to digital converter 240 is set carries out over-sampling, promptly sampling rate is higher than the effective frequency of utilization scope of sensor more than 10 times, to improve A/D effective resolution and antijamming capability, reduces the noise voltage in the tested frequency band.
In the practical application, between conditioning filtering submodule 21 and A/D analog to digital converter 240, can also comprise integration submodule 22 (being shown in broken lines among the figure), as the hardware integrating circuit, be used for collection and nurse one's health filtered vibration acceleration value and carry out integration, obtain vibration speed value, vibration speed value is carried out integration again, obtain the vibration displacement value, be used for follow-up numeric ratio.
In the practical application, main processing sub 24 can also comprise digital filter 241, be used for the digital signal after the analog to digital conversion is carried out digital filtering, further remove the lower and interference of bringing into of front end conditioning filtering submodule 21 exponent numbers, can adopt limit for length's impulse response (FIR, Finite ImpulseResponse) wave filter.
In the present embodiment, main processing sub 24 adopts the MSP430 series monolithic of TI company.The MSP430 series monolithic is 16 Reduced Instruction Set Computings (RISC, Reduced InstructionSet Computer) single-chip microcomputers, and working current and quiescent current are very low, have possessed powerful operation capacity simultaneously.The signal of conditioning filtering submodule 21 outputs, or the signal of hardware integrating circuit output directly export 12 analog to digital converters 240 that main processing sub 24 carries to and are converted into digital signal.
Timing submodule 25, be used for triggering the main processing sub 24 that is in deep-sleep at ordinary times by the predefined sampling period, and, the result who obtains when numerical evaluation reaches preset value greater than predefined alarming value or the trigger pip number of times of exporting to sensor, all numerical value that triggering wireless communication module 12 will be gathered are transferred to center gateway or router, and receive the controlled variable of wireless communication module 12 outputs, self and preset value are upgraded in predefined cycle.
In the practical application, regularly submodule 25 can adopt and have high precision real-time clock (RTC, RealTime Clock) and the ferroelectric memory (FRAM of event counter, Ferroelectric RandomAccess Memory) storaging chip, in order to storage system parameter and interim sampled data, the adjusted precision of its RTC can reach 2.17ppm, trigger pip is linked into the respective pin of main processing sub 24 and wireless communication module 12 respectively, trigger main processing sub 24 and the wireless communication module 12 that is in deep-sleep at ordinary times by the cycle that event counter is set, working current was only 500 microamperes during this chip read and write data, when idle only 1 microampere.
802.15.4 physical layer protocol control and data transmit-receive chip, be used on the spread spectrum, encoding and decoding, orthogonal PSK (O-QPSK, Offset-Quadrature Phase Shift Keying) modulating/demodulating, base band signal process, signal of transceiver/down coversion, the data radio frequency sends with the radio frequency reception etc.
802.15.4MAC the layer protocol analysis chip is used for the 802.15.4MAC layer protocol and resolves, and comprising: set up network topology structure and connect; Realize the packing of MAC layer data and separate packet function; The equipment in the network of realizing passes mutually by Coordinator, Router and End Device Point-to-Point Data; Prevent signal collision; Sensor node is realized time synchronized; Realize the seamless interfacing of data link between data conditioning device and base station equipment; Logarithm is executed the control etc. of maintaining secrecy factually.
In the present embodiment, the control of 802.15.4 physical layer protocol can be adopted MC13192 with the data transmit-receive chip, and 802.15.4MAC layer protocol analysis chip adopts MC9S08GT60; Also 802.15.4 physical layer protocol control and data transmit-receive chip and 802.15.4MAC layer protocol analysis chip can be carried out integrated, as the 802.15.4 agreement integrated chip CC2430 of employing TI company.
The network topology structure of wireless communication module 12 can adopt connected modes such as Star Network, point to point network, bunch shape tree or mesh network, and consolidated network can hold 65000 sensor nodes, adopts the transmission mode of multi-hop, thereby covers wide scope; Also can be according to the concrete needs of user, the network that customization is fit to connects.
In the practical application, when wireless communication module 12 carries out wireless receiving and dispatching, on sendaisle and receiving cable, radio-frequency power amplifier and low noise amplifier can also be set, transmitting-receiving power be amplified, to increase internodal communication distance.Its transmit receive antenna can adopt PCB antenna, also can adopt paster antenna or whip antenna.
In the practical application, power module 13 can adopt general dry battery or lithium battery, also can adopt solar cell, to be used for conversion of solar energy be electric energy and be stored in the electric capacity, can also adopt miniature vibration electric generator, the weak vibration energy that utilizes the piezoelectric principle collection structure to produce is converted into electric weight, is stored in the electric capacity.
In the present embodiment, the DC voltage that power module 13 provides is 3V, in the practical application, also can provide different DC voltage, as 3.3V according to the operating voltage of sensor 10, data conditioning acquisition processing module 11 and wireless communication module 12,2.5V, 1.8V or 5V.
Embodiment two:
In embodiment one, conditioning filtering submodule 21 comprises integration submodule 22, carries out integration to nursing one's health filtered accekeration, obtains velocity amplitude, and velocity amplitude is carried out integration again, obtains shift value.In the practical application,, also can integration submodule 32 (being shown in broken lines among the figure) be set in main processing sub 24, as the software integral algorithm if be applied to the vibration monitoring field.Fig. 3 is the apparatus structure synoptic diagram that the embodiment of the invention two realizes low-consumption wireless monitor.Referring to Fig. 3, different with Fig. 2 is, signal from sensor 10 collections, nurse one's health filtering through conditioning filtering submodule 21, export A/D analog to digital converter 240 to and carry out analog to digital conversion, signal after the conversion carries out digital filtering through digital filter 241, further remove the lower and interference of bringing into of front end conditioning filtering submodule 21 exponent numbers, filtered signal exports integration submodule 32 to, just utilize the software integral algorithm to carry out an integration or twice integration, the correlation values that obtains vibrating exports numerical evaluation device 243 to and carries out numerical evaluation.
Embodiment three:
Among embodiment one and the embodiment two, sensor 10 is a vibration acceleration sensor, and in the practical application, sensor 10 also can be temperature sensor, strain transducer, displacement transducer and the pressure transducer that carries out temperature, strain, displacement or pressure monitoring.Fig. 4 is the apparatus structure synoptic diagram that the embodiment of the invention three realizes low-consumption wireless monitor.Referring to Fig. 4, different with Fig. 2, Fig. 3 is, because what sensor 10 adopted is temperature sensor, strain transducer, displacement transducer or pressure transducer, no longer need to nurse one's health the integration submodule 22 between filtering submodule 41 and the A/D analog to digital converter 240, or the integration submodule 32 between digital filter 241 and the numerical evaluation device 243; Simultaneously, conditioning filtering submodule 41 is also slightly different on 26S Proteasome Structure and Function, is used to nurse one's health bridge circuit sensor such as temperature, strain, displacement and measure physical quantities is converted to voltage signal.Below conditioning filtering submodule 41 is described.
Join resistor bridge 411, be used for the acquired signal of sensor 10 outputs is converted to voltage signal, acquired signal according to sensor 10 outputs that receive changes the variation that causes self-resistance, make and flow through this electric current of joining 411 liang of arms of resistor bridge and change, that is cause that this joins 411 liang of arm voltage differences of resistor bridge and change, output is proportional with resistance variations, just changes proportional voltage signal to amplifier 413 with voltage difference;
Bridge circuit driving voltage circuit 412, the trigger pip that is used to receive main processing sub 24 outputs triggers, and provides constant driving voltage for joining resistor bridge 411;
As seen from the above-described embodiment, the present invention realizes the device of low-consumption wireless monitor, control the duty of main processing sub and wireless communication module by the timing submodule, the duty of main processing sub control sensor, conditioning filtering submodule is nursed one's health filtering to the signal of sensor acquisition, perhaps further utilize the integration submodule again, obtain vibration acceleration value, velocity amplitude and shift value, export the A/D analog to digital converter to, become digital signal, in digital filter, further remove and disturb the back to calculate effective numerical value by the numerical evaluation device; Perhaps, the signal of gathering is through conditioning filtering, export the A/D analog to digital converter to, become digital signal, in digital filter, further remove and disturb, further utilize integral algorithm again, obtain to calculate effective numerical value by the numerical evaluation device behind vibration acceleration value, velocity amplitude and the shift value, and compare with predefined alarming value, if not unusual, will be after the value storage trigger that device will be placed dormant state by the timing submodule.If exporting to the trigger pip number of times of sensor, numerical exception or timing submodule reach preset value; regularly submodule triggers wireless communication module; all numerical value that wireless communication module will be gathered are transferred to center gateway or router; inquire that simultaneously the center gateway has or not other control or acquisition; if do not receive the order of center gateway; it will continue to enter dormant state; reduced the power consumption of device; what wireless communication module transmitted is digital signal; antijamming capability is strong; long transmission distance, the transmission reliability height, easy to install.
Fig. 5 realizes the method flow synoptic diagram of low-consumption wireless monitor for the embodiment of the invention.Referring to Fig. 5, this flow process comprises:
In this step, after wireless monitoring device powers on, wireless communication module is responsible for and center gateway or router communication, join wireless sensor network, center gateway or router are with controlled variable, as parameters such as sampling period, sampling interval and preset values, the predefined cycle parameter of submodule and preestablish value parameter and be transferred to wireless communication module regularly just, wireless communication module exports regularly submodule to.
In step 502～503, regularly submodule receives the controlled variable of wireless communication module output, and beginning regularly places dormant state with data conditioning acquisition processing module and wireless communication module, to reduce power consumption.
In this step, regularly submodule output trigger pip trigger data is nursed one's health the main processing sub in the acquisition processing module, main processing sub triggers sensor, sensor is selected according to different monitoring objectives and monitoring parameter, commencing signal is gathered, the signal of gathering is through conditioning filtering, integration, A/D analog to digital conversion, digital filtering and numerical evaluation, the correlation values that obtains monitoring.
In this step, according to different monitoring objectives and monitoring parameter, preestablish corresponding alarming value, specifically, if be used for vibration monitoring, predefined alarming value can be the vibration acceleration value, it also can be vibration speed value, it can also be the vibration displacement value, if predefined alarming value is the vibration acceleration value, then nursing one's health filtered signal does not need, then to nurse one's health filtered signal demand and carry out integral operation once or twice if predefined alarming value is vibration speed value or vibration displacement value through integral operation; If be used for temperature or pressure or strain or displacement monitoring, predefined alarming value then is temperature or pressure or strain or displacement correlation parameter; The numerical value and the predefined alarming value that calculate are compared, if the result that numerical evaluation obtains is not more than predefined alarming value, then show not unusually, after the result that main processing sub obtains numerical evaluation is stored in the numerical evaluation device, enter park mode, to reduce power consumption.
In this step, numeric ratio occurs unusually in step 506 or the trigger pip number of times that regularly submodule is exported to sensor reaches preset value, regularly submodule is exported trigger pip, trigger wireless communication module, wireless communication module receives the abnormal information of main processing sub output and the result that numerical evaluation obtains, export center gateway or router to, inquire that simultaneously center gateway or router have or not other controlled variable, if receive the controlled variable that center gateway or router send, upgrade regularly the timing parameters in the submodule, be predefined cycle and preset value, regularly submodule is according to the timing parameters control data conditioning acquisition processing module that upgrades and the mode of operation of wireless communication module; If do not receive the order of center gateway or router, after finishing, transmission will continue to enter dormant state.
More than lift preferred embodiment; the purpose, technical solutions and advantages of the present invention are further described; institute is understood that; the above only is preferred embodiment of the present invention; not in order to restriction the present invention; within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1, a kind of device of realizing low-consumption wireless monitor is characterized in that, this device comprises: sensor, data conditioning acquisition processing module, wireless communication module and power module, wherein,
Sensor according to the trigger pip of data conditioning acquisition processing module output, is gathered monitoring point information, and is exported acquired signal to the data conditioning acquisition processing module;
The data conditioning acquisition processing module is used for being undertaken by the predefined cycle triggering of self, and to sensor output trigger pip, triggers the sensor acquisition signal; The acquired signal of receiving sensor output, acquired signal is nursed one's health filtering, over-sampling analog to digital conversion, digital signal processing and numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared, if be not more than the alarming value of setting, after the result that numerical evaluation is obtained stores self is placed dormant state; If the result that numerical evaluation obtains is greater than predefined alarming value, or the described trigger pip number of times of exporting to sensor reaches preset value, and the output trigger pip triggers wireless communication module and exports the result that numerical evaluation obtains to wireless communication module;
Wireless communication module, adopt the IEEE802.15.4 standard to transmit, trigger pip according to the output of data conditioning acquisition processing module, the result that the numerical evaluation of reception data conditioning acquisition processing module output obtains, be sent to outside center gateway or router, the controlled variable that receiving center gateway or router send, export the data conditioning acquisition processing module to, described predefined cycle of data conditioning acquisition processing module and preset value are upgraded, after finishing reception and transmission task, change dormant state over to;
Power module is used to provide the operating voltage of sensor, data conditioning acquisition processing module and wireless communication module.
2, device as claimed in claim 1 is characterized in that, described data conditioning acquisition processing module comprises conditioning filtering submodule, main processing sub and timing submodule, wherein,
Conditioning filtering submodule triggers according to the trigger pip of main processing sub output, is used for the acquired signal filtering with sensor output, obtains the required bandwidth of monitoring, will nurse one's health filtering after signal export main processing sub to;
Main processing sub, according to the predefined cycle triggering of timing submodule, be used for signal to the output of conditioning filtering submodule carry out analog to digital conversion and will change after signal carry out numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared, if be not more than predefined alarming value, value storage be placed on dormant state; If greater than predefined alarming value or the described trigger pip number of times of exporting to sensor reaches preset value, the output trigger pip triggers wireless communication module and exports the result that numerical evaluation obtains to wireless communication module;
The timing submodule, be used for triggering main processing sub by the predefined cycle, and the result who obtains when numerical evaluation reaches preset value greater than predefined alarming value or the described trigger pip number of times of exporting to sensor, and the output trigger pip triggers wireless communication module.
3, device as claimed in claim 2 is characterized in that, described sensor is a micro electro-mechanical systems acceleration sensor, or piezoelectric acceleration sensor, or the electric charge acceleration transducer, or the built-in circuit piezoelectric acceleration sensor.
4, device as claimed in claim 2 is characterized in that, described conditioning filtering submodule comprises the capacitance-resistance device, and the trigger pip that is used to receive main processing sub output triggers; With the acquired signal filtering of sensor output, obtain the required bandwidth of monitoring, will nurse one's health filtering after signal export main processing sub to;
Described conditioning filtering submodule comprises that further electric charge amplifies change-over circuit, is used for output with sensor and is converted to voltage signal and amplifies.
5, device as claimed in claim 2 is characterized in that, described conditioning filtering submodule comprises the capacitance-resistance device, and the trigger pip that is used to receive main processing sub output triggers; With the acquired signal filtering of sensor output, obtain the required bandwidth of monitoring, will nurse one's health filtering after signal export main processing sub to;
Described conditioning filtering submodule further comprises constant-current circuit, and being used for provides the constant current source excitation to sensor.
As claim 2 or 4 or 5 described devices, it is characterized in that 6, described conditioning filtering submodule is single order resistance capacity filter or 2 to 8 rank butterworth filters.
7, device as claimed in claim 2 is characterized in that, described conditioning filtering submodule comprises joins resistor bridge and bridge circuit driving voltage circuit, wherein,
Join resistor bridge, be used for the acquired signal of sensor output is converted to voltage signal, acquired signal according to the sensor output that receives changes the variation that causes self-resistance, makes to flow through this electric current of joining resistor bridge two arms and change output and the proportional voltage signal of resistance variations;
Bridge circuit driving voltage circuit, the trigger pip that is used to receive main processing sub output triggers, and provides constant driving voltage for joining resistor bridge;
Described conditioning filtering submodule further comprises amplifier, is used to receive the voltage signal of joining resistor bridge output, amplifies, and exports main processing sub to.
8, device as claimed in claim 7 is characterized in that, described sensor is a temperature sensor, or strain transducer, or displacement transducer, or pressure transducer.
9, device as claimed in claim 2 is characterized in that, described main processing sub comprises A/D analog to digital converter and numerical evaluation device, wherein,
The A/D analog to digital converter is used for the signal of conditioning filtering submodule output is carried out analog to digital conversion, exports the numerical evaluation device to;
The numerical evaluation device is used for the digital signal after the analog to digital conversion is carried out numerical evaluation, and result and the predefined alarming value that numerical evaluation obtains compared.
10, device as claimed in claim 9 is characterized in that, the sampling rate of described A/D analog to digital converter is not less than 10 times of the effective frequency of utilization scope of sensor.
11, device as claimed in claim 9, it is characterized in that described main processing sub further comprises digital filter, be used for the digital signal after the analog to digital conversion is carried out digital filtering, further remove the interference that front end conditioning filtering submodule is brought into, export the numerical evaluation device to.
12, device as claimed in claim 11 is characterized in that, described digital filter is for there being limit for length's impact response filter.
As claim 9 or 11 described devices, it is characterized in that 13, described main processing sub further comprises one or more integration submodules, be used for the signal behind analog to digital conversion or the digital filtering is carried out the one or many integration.
14, device as claimed in claim 2 is characterized in that, described data conditioning acquisition processing module further comprises one or more integration submodules, is used for the signal of conditioning filtering submodule output is carried out the one or many integration.
15, device as claimed in claim 1 is characterized in that, described wireless communication module network topology structure is Star Network, point to point network, bunch shape tree or mesh network, adopts the wireless protocols of IEEE802.15.4 standard to carry out data transmission.
16, device as claimed in claim 1 is characterized in that, described wireless communication module further comprises radio-frequency power amplifier and/or low noise amplifier, is used for receiving and transmitting signal power is amplified.
17, device as claimed in claim 1 is characterized in that, the dual-mode antenna of described wireless communication module is PCB antenna or paster antenna or whip antenna.
18, device as claimed in claim 1 is characterized in that, the DC voltage that described power module provides is 3V or 3.3V, 2.5V, 1.8V or 5V.
19, device as claimed in claim 1 is characterized in that, described power module is a miniature vibration electric generator, the vibrational energy that utilizes the piezoelectric principle collection structure to produce, be converted into electric weight and be stored in the electric capacity, or be solar cell, to be used for conversion of solar energy be electric energy and be stored in the electric capacity.
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