CN100481145C - System and method for remote asset monitoring - Google Patents
System and method for remote asset monitoring Download PDFInfo
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- CN100481145C CN100481145C CNB2005800077534A CN200580007753A CN100481145C CN 100481145 C CN100481145 C CN 100481145C CN B2005800077534 A CNB2005800077534 A CN B2005800077534A CN 200580007753 A CN200580007753 A CN 200580007753A CN 100481145 C CN100481145 C CN 100481145C
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Abstract
A system and method for remotely monitoring conditions at a location and for controlling devices at the location. The inventive system includes: a data link in communication with an electronically readable instrument, the data link having a transceiver configured for wireless digital communication; and a data gate having a wireless transceiver configured to communicate with one or more data links, the data gate also having an interface for connection to a communication network such as a land-line telephone network, cellular/pcs network, satellite communication network, or the like. In a preferred embodiment, the data gate communicates with a server via the communication network where the information from the electronically readable instrument is processed and made available to other devices over a computer network.
Description
Technical field
The present invention relates to be used to monitor system and method with management data.More specifically, but and unrestricted, the present invention relates to a kind of system, this system is used for the data that the situation located with the mode telemonitoring storage tank, container, distributing trough, pipeline etc. of safety in essence and management are collected as the result of this supervision.
Background technology
Tank level, the gas/liquid stream that passes through pipeline or power consumption be the problem of people's care normally.For a long time, it has been recognized that and remotely to monitor these situations.Current, when can easily the electronically readable instrument being used for this supervision, but almost not can be used for such instrument is carried out the alternatives of telemonitoring.
For example, many families as main energy source, especially use it for the heat production household electrical appliances with liquefied petroleum gas (LPG), as heating system, baking box and cooking stove, water heater or the like.Usually, each household all has been equipped with the storage tank of himself, to satisfy the energy requirement of its family expenses.The householder must make regular check on the table meter of storage tank, when tank level is low, needs to order more liquefied petroleum gas (LPG).In addition, supplier can reach an agreement with the householder, to make regular check on tank level, when needs, fills it up with storage tank again.In two kinds of methods, making regular check on the table meter is inconvenient, insecure at least, and may cause higher cost.
A kind of known replacement scheme is, for these storage tanks are equipped with electronically readable table meter.In such configuration, above-mentioned table meter is connected to battery-powered radiofrequency launcher, and this transmitter regularly sends to tank level the receiver that is positioned at premises.This receiver is collected use information, and just calls out liquefied gas supplier by telephone wire at regular intervals, to report the information of above-mentioned collection to it.Also this receiver can be configured to discern abnormal conditions and spontaneously report some incidents (as minimum liquid level, show as the operating position of leakage, or the like).Although this is great improvement for artificial supervision, these systems still have been subjected to some restrictions.
For example, these restrictions comprise: purpose such as do not exist for control, special supervision or change one's plans and data are sent back the means of storage tank; Ignore the needs of renewal or the situation of variation,, thereby wasted serviceable life of transmitter battery with fixing rate sending data; Transmission is carried out with asynchronous system, thereby in having the zone of a plurality of transmitters, some transmission will overlap sometimes, cause having destroyed the data from these transmitters.
Although these restrictions can be overcome in the system of two-way operation, receiver is set at the monitored position place will further reduce the serviceable life of battery.At present the expection battery life of system with year number weigh.For the wireless receiver continued power in the battery power supply unit at storage tank place obviously is unpractical.For the variation of battery or again charging surveillance is safeguarded that required manpower will be near the artificial required manpower of meter reading meter.
If for storage tank provides public power supply service and telephone wire is set herein, obviously do not need to be concerned about the behaviour in service of battery, yet this situation will increase considerably cost and complicacy that storage tank is installed.In addition, in that being set near the storage tank, consumer will increase the fire risk that causes because of the leakage of liquefied gas or discharge (finish, take place when accessory is separated) at gas injection process.
Should be noted that other remote storage or induction system also have been subjected to the influence of similar problem.Remote pipeline flow meters, ammeter or the like need to monitor.Even adopt electronically readable table meter, surveillance also needs special fetch equipment is transported to above-mentioned table meter place usually, and the permanent circuit that need be connected with surveillance connects, perhaps, if monitor wirelessly, then only just reporting through after the relatively-stationary time at every turn.
Existing buried tank provides and the example that monitors relevant problem.Traditionally, will insert storage tank, to determine oil mass remaining in the jar than long gage.In the past few years, people increase with the concern of leakage to the problem that influences of environment day by day to the problem of aging of underground oil tank.Government control has caused more strict supervision requirement, and in fact these requirements can not be carried out with artificial mode.
In existing installation, difficult enforcement is used to monitor the automated system of underground tank.In order to be such surveillance installation wiring, need carry out a large amount of excacations, these excavate usually will see through storage tank cement coverture on every side.Also need equipment and wiring in the storage tank or around it are designed, so that taking place to prevent blast or fire when fuel or gas are overflowed.Before this, radio detection is unpractiaca, only sends the RF signal because be difficult to from underground position.
Market pressure continue to promote safety in essence, response times is used for remote asset monitoring (as monitoring and the report tank leak) with the electronic equipment that reliability is improved.Thereby challenge still exists, and still needs the System and method for of remote asset monitoring is improved, and this present invention just at target.
Summary of the invention
The invention provides a kind of system that is used to monitor and report the situation at storage or induction system place, this system has overcome foregoing problems, and has alleviated above-mentioned needs.This system comprises the sensor that is used to read telemetry (as height or the transfer rate of material in storage container); The data link of communicating by letter with the sensor, this data link has the transceiver that is disposed for the double-direction radio digital communication; The transmission of above-mentioned data link is carried out the repeater of relaying, wherein, this repeater comprises as the solar panel of energy ancillary equipment and data gate, and this data gate has and is disposed for the transceiver of communicating by letter with one or more data link and is used for carrying out the other communication interface of communicating by letter with computer system.
In a preferred embodiment, above-mentioned data link and data gate have adopted some power-saving technologies, and it is battery-powered to make that these equipment are very suitable for.Such power-saving technology comprises: allow pressure regulator intermittently work; The work of transmitter and corresponding receiver is planned with synchronously, transmitter and receiver are cut off the power supply with permission; Use the agreement of noise resistance, this agreement makes transmitter can utilize possible lowest power to export to carry out work.
In a further advantageous embodiment, above-mentioned communication interface can pass through 1) traditional landline; 2) honeycomb/Personal Communications Services telephone system; Or 3) satellite communication system provides connection.For the purpose of the present invention, such system is referred to as " public network ".
In a further advantageous embodiment, above-mentioned data gate is communicated by letter with the computer system that is configured to database server by public network.By such as computer networks such as LAN (Local Area Network), the Internets, this database server makes that the data of collecting from one or more data gate can be that a plurality of application programs are used.Software application can provide (for example and without limitation): the automatic ordering input; Scheduling; Alarm; The routine maintenance request; Plan information; Historical data; Use according to selection type (as geographic area, client's demographics, historical operating position etc.); Logistics control or the like.
In a further advantageous embodiment, be provided with controllable device, thereby by the data gate and the data link of communicating by letter with the controllable device of on-site supervision, computing system can manage just to above-mentioned storage or induction system at the telemonitoring scene.Thereby, just can remotely change the supervision standard, perhaps, hardware equipment remotely.
By consulting accompanying drawing and reading DETAILED DESCRIPTION OF THE PREFERRED, those skilled in the art will more be expressly understood other targets of the present invention, feature and advantage.
Description of drawings
Fig. 1 shows the preferred embodiment of the system that is used to monitor and manages of the present invention.
Fig. 2 provides the upward view of data link of the system of Fig. 1.
Fig. 3 provides the side view of the data link of Fig. 2.
Fig. 4 provides the block diagram of the data link of Fig. 3.
Fig. 5 provides the block diagram that is used for the data gate of communicating by letter with one or more data link of Fig. 3.
Fig. 6 provides the block diagram of the repeater of the system of the present invention that is used for Fig. 1.
Fig. 7 provides a kind of process flow diagram of method, and this method is used for communicating between data link and data gate by the network that the system of the present invention at Fig. 1 uses.
Fig. 8 provides a kind of process flow diagram of method, and this method is used for communicating between data link, data gate and server by wireless network, and above-mentioned server configures becomes to be received in the HTTP input of using in the system of the present invention of Fig. 1.
Embodiment
Before explaining the present invention in detail, importantly should understand to the invention is not restricted to its application specific details and step as herein described in described structure.The present invention can have other embodiment, and can implement and realize with several different methods.Should understand that wording and term that this paper adopts are exclusively used in illustration purpose, but not limit with it.
With reference now to accompanying drawing,, wherein, in whole a few width of cloth views, identical Reference numeral is represented identical part.In Fig. 1, show the block diagram of supervision of the present invention and management system (" system ") 20.20 pairs of systems monitor that tank leak is particularly useful.In exemplary systems, one or more data link (being also referred to as asset interface device herein) 22a-f communicates by letter with data gate 24 (being also referred to as transmission equipment herein).Data gate 24 is communicated by letter with public network 26, and the latter communicates by letter with server 28.In a preferred embodiment, system 20 comprises repeater 30, and this repeater uses solar panel 32 to charge again for the battery that is included in wherein.Introduction that below will be more detailed, the communication that takes place along the data routing of system 20 is two-way.
Substantially, data link (as 22a-f) is the transceiver that is configured to carry out with data gate 24 bi-directional digital communication.Data link 22 is safe in itself, and it uses powered battery, and is arranged in the housing, is suitable for using out of doors.Yet, should be noted that and why data link 22 is included into the rank of safety in essence, and do not lie in its shell, and be the circuit structure that its current consumption is extremely low.Data link 22 preferably also comprises circuit or other sensors that is used to read electronically readable table meter, so that it is useful to the long-range instrument that reads on following these facilities (give an example and unrestricted): propane tank 34; Storage tank 36; Diesel oil tank 38; Pressure gas storage tank 40; Water meter or gas meter 42; Ammeter 44, or the like.
To those skilled in the art, apparent, traditionally, the said equipment all is furnished with the table meter, so that it is carried out visual supervision.Use known method that the stem-winder meter is converted to the electronically readable configuration, perhaps, except that the stem-winder meter, can add the sensor of existing electronically readable easily.In addition, these equipment are usually located at the open air or are positioned at remote zone, and this makes that artificial supervision is very inconvenient, and seldom provides electric power supply and the wiring that is provided for communicating by letter for the purpose that monitors automatically.Thereby for monitoring these equipment, optimal method is to adopt weatherproof, wireless and battery-powered equipment.
Next referring to figs. 2 and 3, data link 22 preferably includes: the housing 46 with openend 48; Include and be arranged on circuit board 50 in the housing 46 in by openend 48; Lid 52, it is fixed to housing 46 by securing member 54, openend 48 is covered, so that data link 22 and environment is isolated.In assembling process, securing member 54 keeps protuberance to engage with securing member, is fixed to housing 46 so that will cover 52.Yet, should be noted that the rank that data link 22 is included into essential safety is because the circuit arrangement of data link 22, rather than because housing 46 and the lid 52 that is fixed to housing 46.
Forward Fig. 4 now to, data link 22 preferably includes circuit board 22, and this circuit board comprises: transceiver 58, and the form with the RF interface circuit illustrates in the drawings, and is disposed for carrying out radio communication with repeater 30 and/or data gate 24 (all seeing Fig. 1); Comprise the counting circuit 62 of clock circuit, the form with processor illustrates in the drawings, is used for control data link 22; Durable cell 64 is used to data link 22 power supplies; Regulator circuit 66 responds above-mentioned clock circuit, and starts the working time of predetermined length off and on by this clock circuit, so that the power of battery 64 is imported the circuit of data link 22; The capacitor of predetermined capacitance value, wherein, when starting regulator circuit 66, in the working time of described predetermined length, durable cell 64 provides electric energy to this capacitor, so that be described capacitor charging.When regulator circuit was stopped using, durable cell 64 continued as the clock circuit power supply, till described clock circuit restarts regulator circuit 66.
Next with reference to figure 5, data gate 24 preferably includes circuit board 68, and this circuit board comprises: transceiver 70, form with the RF interface circuit illustrates in the drawings, and be configured to carry out radio communication with data link 22a-f, and, randomly carry out radio communication with public network 26 (see figure 1)s; Counting circuit 72, the form with processor illustrates in the drawings, is used for control data door 24; Durable cell 74 is used to data gate 24 power supplies; Regulator circuit 76 is used to control the power of the circuit of input data gate 24; And, in a preferred embodiment, also comprise communication interface circuit, be used for communicating by letter with public network 26.In a preferred embodiment, this public network is traditional telephone network, yet, should be noted that other well-known public networks comprise: cellular radio network; The CDMA telephone network; CDPD, GSM and GPRS network (they are subclass of cellular radio network); Satellite communication link; The Internet; Or the like.Counting circuit 66 (Fig. 4) preferably includes the storer of the information that is used for store configuration information, alert threshold and receives from data link 22 (Fig. 1) etc.
As shown in Figure 1, server 32 is communicated by letter with data gate 24 by public network (as by traditional land telephone network).Server 32 comprises server (being http server), and this server is used to manage it and is connected and information flow with network between the client.For the present invention, the purpose of this server is that information is mail to data gate 24 and receives information from this data gate, and makes above-mentioned data to use for other equipment.
In the preferred embodiment, communicating by letter between data gate 24 and the server 32 carried out with the UDP form.The UDP form allows the grouping of above-mentioned data gate and the suitable size of server exchange, and is unlikely to cause overcharge to data gate.The packet format of competition will increase the complicacy and the software areal coverage (software footprint) of data gate.According to design, the data of HTTP form are handled in server 32 expections.For taking into account the demand of above-mentioned server and data gate 24, during these two kinds of devices communicate, operation UDP gateway application on server, this program is changed between the UDP form of the HTTP of server 32 form and data gate 24.
Each request that data gate 24 is sent to server is limited in 500 bytes or still less, and this size just in time is consistent with the size of single UDP bag.Be to realize dense transfers, send the data of above-mentioned UDP in dividing into groups with undressed binary format.At the server place, the UDP gateway will expand to ascii string from the data of UDP grouping, and add the address of http server, to create single HTTP request row.Then, receive response, and its buffering is kept in the storer from http server by the UDP gateway.Server splits into the segmentation (easily by UDP send) of 500 bytes with this response, and first grouping is sent to data gate 24.When data gate 24 receives this first when grouping, it sends request to next one grouping to the UDP gateway.This process continues to carry out, till all groupings all are sent to data gate 24 from server 32.If data gate request grouping but do not receiving this grouping after after a while, then it repeats this request simply.
Should be noted that in a preferred embodiment server 32 is webservers, and the Internet in any place connects all can almost to send in real time and receive and goes to and from the information of data gate 24 in the world.
Again with reference to figure 4, the sensor interface circuitry 60 of data link 22 also can be with being designed for sensor (as discrete sensor, pressure transducer, level sensor, force cell, flowmeter, accelerometer or the like) use that direct electronics reads.In a preferred embodiment, the interconnection between the sensor interface circuitry 60 comprises that loopback connects, thereby makes processor 62 can determine whether to have connected sensor and be connected sensor when.When not connecting sensor (as in transit or when storage), data link 22 keeps not working, and does not attempt to transmit by wireless network.In case detect sensor, data link just attempts to be connected to network.
As mentioned above, data link 22 can read the data from various sensors.In a preferred embodiment, connect sensor and data link 22 open with the communicating by letter of data gate 24 after, data link 22 sends to data gate 24 and asks, to find out the sensor that has connected which kind of type.Data gate 24 is transmitted to server 32 with this request.Server 32 will be connected to data link 22 from the sensor of which kind of type of database lookup, and report this sensor type to data gate 24.Data gate 24 is reported this sensor type to data link 22 again, and data link 22 is configured himself according to the sensor that connects.
With reference to figure 1,, then can between data link 22a-f and data gate 24, insert some and be provided with the repeater 30 of solar panel if cause to receive the RF signal reliably because of the distance between any data link 22a-f and the data gate 24 is excessive.The block diagram of repeater 30 has been shown among Fig. 6.Repeater 30 preferably includes: printed circuit board (PCB) 80 is used to support transceiver (form with the RF interface circuit illustrates, and is used for carrying out radio communication with data link 22a-f) and/or data gate; With counting circuit 84 shown in the forms of sensor, that comprise clock circuit, be used to control repeater 30; Solar panel is used for the durable cell that is included among the repeater 30 is recharged.During sending packet,, after sending each grouping,, will transmit blank grouping along with stopping using of transmitter as hereinafter being described in detail.If there is repeater, then it receives the grouping that arrives, and resends any grouping that receives during transmitting apparatus quits work.
Should be noted that best data link 22 and data gate 24 are all battery-powered.The work of control data link 22 and data gate 24 is so that farthest save the power of battery.In a preferred embodiment, carry out the transmission between each data link and its relevant data gate 24 with predetermined, synchronous mode.For saving the power of battery, can be with the whole radio frequency interface outage of data link and data gate, till next foregone conclusion spare.
In a further advantageous embodiment, save the power of battery by the discontinuous operation of pressure regulator.Refer again to Fig. 4, by pressure regulator 66 power is offered the circuit of data link 22 by battery 64.Have 50 milliamperes quiescent current if suppose pressure regulator 66 for the purpose of giving an example, and pressure regulator 66 is with the normal mode continuous working, then battery 64 will always bear at least 50 milliamperes electric current and flow out.On the other hand, if pressure regulator discontinuous operation (may have 2 percent dutycycle) then at pressure regulator 66 duration of works, is charged to capacitor 68, and during pressure regulator 66 quits work, is operated the circuit of this data link.Although during pressure regulator 66 quits work, drop will appear in the voltage at capacitor 68 two ends, and by selecting suitable values for capacitor 68, drop that can above-mentioned voltage is set to negligible level.According to the power requirement of this circuit, those skilled in the art can select such capacitor easily, wherein
Energy=.5CV
2
The electric energy that needs for foregoing circuit power supply station during above-mentioned energy is meant and quits work, C is the capacitance of capacitor 68, and V is tolerable drop voltage.In addition, can select the value of capacitor C by research technique.
Take above-mentioned example, although the power consumption of the operating circuit of data link remains unchanged, the quiescent current of pressure regulator 66 is reduced to 1 milliampere by 50 milliamperes.
Another specific characteristic of system of the present invention has improved immunity to interference, has eliminated the relevant problem of shake (or asymmetric) with the data stream that receives, and allows to transmit than before the lower RF power of system's power demand.When sending data, there is shake usually at the rising edge and the negative edge of data by radio frequency interface.In relevant problem, the rise time exists significant different with fall time usually.These two results that problem caused are, aspect the actual data bits in accurate locator data stream and the transmission rate of above-mentioned data bit, have uncertainty to a certain degree.In addition, have the possibility of meta noise, this noise can cause single position is read as the value opposite with the binary value that is sent.
For the correct data that arrive of resolving, come these data are sampled with 16 times of sampling rates to the transmission rate that receives data.Each wireless transmission is with one group of one and zero beginning that replaces.Processor uses this to organize to determine the initial reference point of each.When receiving data, processor is ignored three samples and last three samples of each, to avoid by shake or the asymmetric mistake that causes.10 remaining samples then are used for determining according to majority principle the state of position.Because the immunity to interference of this reception programme and the tolerance of its right title, above-mentioned wireless device can send with minimal power, the integrality of the data that the while holding signal carries.
Fig. 7 shows the diagram 100 of the method for aforesaid data integrity scheme, this method starts from step 102, and continue in process steps 104, will locate to be packaged into grouping at dispensing device (as data link 22) by the data that network (as 20) sends, wherein, this grouping is made up of a plurality of positions continuous, that expression is collected by sensor circuit (as 60).In treatment step 106, construct preamble, and it is appended to the above-mentioned a plurality of continuous position at emitter place.This preamble is to construct according to predetermined bit pattern.Along with this preamble being appended to above-mentioned a plurality of continuous position, in process steps 108, pass through above-mentioned a plurality of continuous positions of Network Transmission and additional preambles with predetermined Bit Transmission Rate by described dispensing device.
In process steps 110, the pre-determined bit that is detected above-mentioned preamble by receiving trap (as data gate 24) makes up, to determine the reference position of above-mentioned a plurality of continuous positions.That is to say that the reference position of above-mentioned a plurality of continuous positions is based on described predetermined bit pattern.In process steps 112, each position in above-mentioned receiving trap place samples above-mentioned a plurality of continuous position.This receiving trap is with sample in above-mentioned a plurality of continuous position each of predetermined position sampling rate, and this sampling rate is greater than above-mentioned predetermined Bit Transmission Rate.Allow above-mentioned sampling rate greater than above-mentioned predetermined Bit Transmission Rate, just can guarantee to obtain between each the sampling period in a plurality of continuous position of above-mentioned grouping each a plurality of sampled values in above-mentioned a plurality of continuous position.In process steps 114, abandoned several leading sample of the predetermined number of the position of being sampled; In process steps 116, last several samples of the predetermined number of the position of being sampled have been abandoned; And, in step 118, handle the remaining sample of the position of being sampled, to determine this binary condition by data gate.In final process steps 120, the method for the aforesaid data integrity scheme 100 that is through with.
In an alternative preferred embodiment, the end of each link uses two 128 encryption key to come payload data is encrypted.This transmission plan also provides forward error correction, and it becomes 12 value with each byte conversion, thereby allows receiver to detect and correct a large amount of bit-errors.This technology also allows radio wave transmissions to be got farther with lower power.Such encryption and forward error correction scheme are in the field of business to be well-known.
In a further advantageous embodiment, duplicate all data transmission with the 2nd RF frequency.All carrying out on the channel in other wireless communications still can on second channel, correctly receiving this data under the situation of (in fact communication blocking taking place on this channel).
Fig. 8 shows the diagram 200 of the method for aforesaid data integrity scheme, this method starts from initial step 202, and continue in process steps 204, will locate to be packaged into grouping at dispensing device (as data link 22) by the data that network (as 20) sends, wherein, this grouping is made up of the continuous position of the data of sensor circuit (as 60) collection a plurality of expressions.In process steps 206, construct preamble, and it is appended to the above-mentioned a plurality of continuous position at dispensing device place.This preamble is to construct according to predetermined bit pattern.Along with this preamble being appended to above-mentioned a plurality of continuous position, in process steps 208, send above-mentioned a plurality of continuous positions and additional preamble by network with via the transmission of the RF on first channel.And above-mentioned a plurality of continuous positions and additional preamble are to be transmitted with predetermined Bit Transmission Rate by above-mentioned dispensing device.Along with this preamble being appended to above-mentioned a plurality of continuous position, in process steps 210, resend above-mentioned a plurality of continuous position and additional preamble with identical Bit Transmission Rate by network and via the transmission of the RF on the second channel.
In process steps 212, by the pre-determined bit combination of receiving trap (as data gate 24) detection, to determine the reference position of above-mentioned a plurality of continuous positions by the preamble of above-mentioned first Channel Transmission.That is to say that the reference position of above-mentioned a plurality of continuous positions is based on described predetermined bit pattern.In process steps 212 (or in process steps 214), if not successful to the detection of above-mentioned preamble, then this method proceeds to process steps 216.
In process steps 216, sampled in each position in above-mentioned a plurality of continuous positions at above-mentioned receiving trap place.This receiving trap samples in each position in above-mentioned a plurality of continuous positions with the pre-determined bit sampling rate, and this sampling rate is greater than above-mentioned predetermined Bit Transmission Rate.Allow sampling rate greater than above-mentioned Bit Transmission Rate guarantee to sample between each sampling period in a plurality of continuous position of grouping each a plurality of samples in above-mentioned a plurality of continuous position.In process steps 218, abandoned several leading sample of the predetermined number of the position of being sampled; In step 220, last several samples of the predetermined number of the position of being sampled have been abandoned; In process steps 222, by data gate the residue sample of the position of being sampled is handled, to determine this binary condition; And, in process steps 224, respond packet is sent to above-mentioned dispensing device by above-mentioned receiving trap.The method of aforesaid data integrity scheme 200 finishes in last process steps 226.
In a further advantageous embodiment, above-mentioned payload data is restricted to each transmission and is no more than 16 bytes.Before application forward error correction, for whole group calculate 16 verification and.Then, after using error correction scheme to come the initial grouping of reconstruct, receiver section recomputate this verification and.If this grouping is then ignored in initial verification and inconsistent with the verification of recomputating.The length that increases payload data will cause increasing unusually in proportion, and the mistake that can not correct will occur.If must carry out longer transmission, then payload data is divided into the transmission of 16 bytes.
In a further advantageous embodiment, when receiving a grouping, receiving trap is just determined the intensity from its transmission partner's received signal.The grouping that the next one sends to this partner comprises the indication to the intensity of last received signal.By this way, the device at transmission two ends can be determined the quality of the transmission of its reception.If the intensity of this signal is lower than ideal tensile strength, then device will be the output power of future transmission slightly to rise, and if the power that receives surpass and be used to finish the required power of good reception, then device will be the output power of transmission in future slightly to downward modulation.This allows each device that its output power is minimized, thereby makes its battery life become the longest.
By way of example and unrestricted mode, the example (being used for comprising the system of above each preferred embodiment) of the RF network timing of representing with bit time below having provided: at bit time 0-699, data link sends grouping by channel 1; In bit time 700-1399, data link sends identical grouping by channel 2; In bit time 1400-2099, repeater (if existence) is retransmitted above-mentioned grouping by channel 1; In bit time 2100-2799, repeater (if existence) is retransmitted above-mentioned grouping by channel 2; In bit time 2800-3499, data gate is handled the grouping that receives; In bit time 3500-4199, data gate sends respond packet by channel 1; In bit time 4200-4899, data gate sends identical respond packet by channel 2; In bit time 4900-5599, repeater (if existence) is retransmitted above-mentioned respond packet by channel 1; In 5600-6299, repeater (if existence) is retransmitted above-mentioned respond packet by channel 2.Should be noted that in a preferred embodiment,, regularly do not change for the length payload data shorter than 16 bytes.When sending short grouping, for each stage of data transfer sequence, it is next energy-conservation earlier to turn off transmitter and receiver, and for the moment that the next incident in this order takes place, doing like this is for radio frequency interface is powered again.
In practice, zero constantly, data link sends grouping by channel 1, and all circuit except that clock circuit of stopping using in remaining bit time.Be about at 660 o'clock at bit time, for sending by channel 2, this data link restarts and disposes above-mentioned wireless device.At bit time is 700 o'clock, and data link sends identical grouping by channel 2.Then, data link all circuit except that clock circuit of stopping using once more, up to bit time be about 3460 (when its because of expect on the channel 1, restart circuit from the response of data gate) till.If arrival time is not detect the initial of grouping at 3520 o'clock, then the data link tentation data is destroyed, and all circuit except that clock circuit of stopping using.At bit time is 4160 o'clock, expect on the channel 2, from the response of data gate, data link restarts foregoing circuit.Again, if arrival time is 4220 not detect the initial of this grouping constantly yet, data link all circuit except that clock circuit of stopping using then, and because of anticipate on the channel 1, be to restart circuit at 4860 o'clock from the response on the repeater at bit time.If should attempt also success, data link all circuit except that clock circuit of stopping using then, and because of anticipate on the channel 1, be to restart circuit at 5560 o'clock from the response on the repeater at bit time.In this process, when receiving effective respond packet, these data of data link processes, and inactive all circuit except that clock circuit are till the transmission of being scheduled to next time.
When with data gate (as the data gate 24 of Fig. 1) when coming into operation first, it at first enters " study " pattern.In mode of learning, under the situation of the grouping that does not have arrival, it is idle that data gate keeps.In response to the grouping reception, the data gate arrangement from data link (as Fig. 1 22) transmission next time.In mode of learning, data gate lays a course for all available data link, makes not have two devices with overlapping transmission.And data gate has been stored the precise information about when carrying out the transmission (promptly needing to start the moment of link) from data link.
To those skilled in the art, obviously (especially, can find out from the dirigibility that bidirectional characteristic provided of invention system 20), the mode of operation example that this paper that is quoted provides only is one of data management system of the present invention many mode of operations that can realize.By way of example and unrestricted mode, the inherent reliability of the data transmission that system of the present invention the is included system that makes be very suitable for to the data link (as Fig. 1 22) carry out reprogramming.Such programming comprises the work that alert threshold, identification sensor type, load module are come the guide data link, or even is software behind the processor down loading updating in the data link.
Draw according to system although should be noted that Fig. 1 with individual data door 24,, in typical configuration, it is contemplated that server 32 and a plurality of data gate 24 communicate, and each data gate is communicated by letter with one or more data link 22.Thereby the invention system can monitor and manage the almost storage or the induction system of any number simultaneously.Also should be noted that, in exemplary systems, server 32 provides information to application program, and these application programs need the process automation of some artificial data input, for example (but not limiting the invention): arrange the storage tank of delivery of propane to the user before can making it; Regularly leave bill for rock gas, water, the electric energy carried; A management jar material of preserving; Or the like.In addition, can analyze the data of this systematic collection,, and when detecting such incident, generate alarm with the possibility of identified leakage, pilferage etc.
In a preferred embodiment, detect the leakage of underground tank with the surveillance 20 of invention.No matter which kind of technology is used to determine whether the technology of leaking is, all need the state of storage tank is reported to surveillance.Before monitoring that required various article put in place, many underground tanks have been installed.Current, by near buildings excavating and the irrigation canals and ditches between the storage tank, can add wiring.This is a with high costs and time-consuming procedure.And use system of the present invention, just the surveillance with wave point can be set in the storage tank by the inlet that is used to pour into.
To those skilled in the art, apparent, when when data link 22 is sent to data gate 24, will be subjected to serious decay from the underground radiofrequency signal of sending.Yet system 20 of the present invention can adapt to this environment automatically.At first, by above-mentioned over-sampling scheme, system 200 can be from very faint reception extracting data data.The second, as mentioned above, this system will regulate power level automatically according to the intensity of received signal.The 3rd, can add the signal that some repeaters come transmission between relay data link 22 and the data gate 24, to guarantee the integrality of transmission.
To those skilled in the art, apparent, can carry out the modification that some do not deviate from the spirit or scope of the present invention to above preferred embodiment.By way of example and unrestricted mode, above-mentioned public network also can comprise the Optical Fiber Transmission of data, land microwave link, infrared data link or the like.Although described current preferred embodiment for purpose of the present disclosure, to those skilled in the art, it is evident that, also there are many changes and modification.And such change and modification are comprised within the spirit of the present invention.
Claims (25)
1. an assets interface arrangement comprises:
Described device circuit is started off and on the clock circuit of predetermined operation time period;
The sensor circuit of communicating by letter with described clock circuit, wherein, described sensor circuit responds the service data about the assets of communicating by letter with described assets interface arrangement;
The transceiver circuit of communicating by letter with described sensor circuit, wherein, described transceiver circuit sends and receives described service data in described predetermined operation time period; And
That communicate by letter with described sensor circuit and described transceiver circuit and be in control circuit between these two kinds of circuit, in the described service data of described operation time period internal conversion, wherein, every kind of circuit in described clock circuit, sensor circuit, transceiver circuit and the control circuit all is configured to the ultralow circuit of current drain, this makes described assets interface arrangement can be attributed to the rank of safety in essence, does not realize the described rank of safety in essence and need not rely on the housing that surrounds described clock circuit, sensor circuit, transceiver circuit and control circuit.
2. device as claimed in claim 1, also comprise the regulating circuit that is configured to the ultralow circuit of current drain and described clock circuit is responded, wherein, when described regulating circuit being started described predetermined operation time period by described clock circuit, described regulating circuit imports each described sensor, transceiver and control circuit with energy, to power to described sensor, transceiver and control circuit.
3. device as claimed in claim 2 also comprises the energy of communicating by letter with described regulating circuit, and wherein, in described predetermined operation time period, the described energy provides the energy that is imported in described sensor, transceiver and the control circuit each by described regulating circuit.
4. device as claimed in claim 3, wherein, described regulating circuit comprises the capacitor of predetermined capacitance value, when starting described regulating circuit, the described energy offers described capacitor with energy in described predetermined operation time period, so that to described capacitor charging.
5. device as claimed in claim 4, wherein, described capacitor is communicated by letter with described clock circuit, and when stopping using described regulating circuit, energy is offered described clock circuit by described clock circuit, and continue energy is offered described clock circuit, till restarting described regulating circuit by described clock circuit.
6. device as claimed in claim 5 wherein, is selected the described predetermined capacitance value of described capacitor, so that the voltage falling at described capacitor two ends is minimum during the described regulating circuit of stopping using.
7. device as claimed in claim 4, also comprise the transmission power adjustment circuit of communicating by letter with described control circuit, wherein, when signal intensity is lower than ideal tensile strength, described transmission power adjustment circuit increases the output power of described transceiver circuit, and when described signal intensity when well receiving essential signal intensity, described regulating circuit reduces the output power of described transceiver circuit.
8. one kind is used for monitoring the storage of volatile matter and the system of induction system in safe in essence mode, comprising:
The assets interface arrangement, described device comprises:
Clock circuit, described circuit start predetermined operation time period with the regulating circuit of the low quiescent current of described device off and on;
Be connected to the capacitor of the output of described regulating circuit, wherein, in described predetermined operation time period, described capacitor charged, till the voltage level of described capacitor reaches the upper limit;
With the sensor circuit that described clock circuit is communicated by letter, the wherein said sensor circuit pair service data relevant with induction system with the storage of described volatile matter responds;
With the transceiver circuit that described sensor circuit is communicated by letter, wherein said transceiver circuit sends and receives described service data in described predetermined operation time period;
Communicate by letter with described sensor circuit and described transceiver circuit and be in control circuit between the two, in the described predetermined described service data of operation time period internal conversion, wherein said clock circuit, sensor circuit, transceiver circuit and control circuit are separately as the ultralow circuit operation of current drain, this makes described assets interface arrangement can be attributed to the rank of safety in essence, do not surround described clock circuit and need not rely on, sensor circuit, the housing of transceiver circuit and control circuit is realized the described rank of safety in essence
The data link of communicating by letter with described assets interface arrangement, wherein, described data link received described service data and retransmits described service data in the described scheduled operation period in the described scheduled operation period;
With the data gate that described assets interface arrangement is communicated by letter with described data link, in the period, described data gate detects the described service data that has sent and resends described service data at described scheduled operation; With
With described data gate server in communication, wherein said server receives described service data and service data is sent to storage and the induction system that described data gate is managed described volatile matter from described data gate, the storage of wherein said volatile matter comprises the controllable device of communicating by letter with described assets interface arrangement with induction system, implement described management with storage and induction system to described volatile matter, and described service data is by via described assets interface arrangement, each step that wireless network between described data gate and the described server communicates is transmitted, and wherein said server configures becomes to accept http protocol.
9. system as claimed in claim 8, wherein, described each step that communicates via the wireless network between described assets interface arrangement, described data gate and the described server that is configured to accept http protocol comprises:
(a) will be packaged into grouping by the described service data that described network sends at described assets interface arrangement place, wherein said grouping comprises a plurality of continuous positions;
(b) be that described a plurality of continuous position makes up preamble at described assets interface arrangement place, wherein said preamble comprises predetermined bit pattern;
(c) send the described grouping with described preamble from described assets interface arrangement by first radio-frequency channel, wherein said preamble and described a plurality of continuous position are sent with predetermined Bit Transmission Rate by described assets interface arrangement;
(d) send the described grouping with described preamble from described assets interface arrangement by second radio-frequency channel, wherein said preamble and described a plurality of continuous position are sent with predetermined Bit Transmission Rate by described assets interface arrangement;
(e) determine the described predetermined bit pattern of the described preamble that sends by described first radio-frequency channel in described data gate, to be combined into described a plurality of continuous definite reference position according to described predetermined hyte;
(f) when determining that for the described a plurality of continuous position that sends by described first radio-frequency channel described reference position is failed, determine the described predetermined bit pattern of the described preamble that sends by described second radio-frequency channel in described data gate, to be combined into described a plurality of continuous definite reference position according to described predetermined hyte;
(g) in the described a plurality of bit pattern of sampling of described data gate, wherein said data gate is with sample in described a plurality of continuous each of predetermined position sampling rate, and described predetermined position sampling rate is greater than described predetermined Bit Transmission Rate, makes that each a plurality of samples of described a plurality of continuous positions are to sample in each sampling period of the described a plurality of continuous position of described grouping; And
(h) respond packet is sent to described assets interface arrangement by described first and second radio-frequency channels from described data gate.
10. system as claimed in claim 9, wherein, described each step that communicates via the wireless network between described assets interface arrangement, described data gate and the described server also comprises:
(i) for each position of the described a plurality of continuous position that receives in described data gate,
(1) ignores the sample of predetermined number in each of described a plurality of continuous position that the beginning of described sampling period is partly sampled;
(2) be kept at each the sample of predetermined number of described a plurality of continuous position of the center section sampling of described sampling period;
(3) ignore the sample of predetermined number in each of the described a plurality of continuous position of the latter end of described sampling period sampling;
(4) handle each the preservation sample of described predetermined number of described a plurality of continuous positions, to determine each binary condition of described a plurality of continuous positions; And
(j) according to each the described grouping of described binary condition reconstruct of the described a plurality of continuous position of in step (i) (4), determining;
(k) form the UDP grouping comprise from first header of the grouping of described reconstruct;
(l) described UDP grouping is sent to described server from described data gate; And
(m) at described server executive routine, described program may further comprise the steps:
(1) receives described UDP grouping;
(2) described UDP grouping is extended for ascii string;
(3) predetermined information is added described ascii string, to form effective HTTP request row; And
(4) described HTTP request row is submitted to described server.
11. system as claimed in claim 8, wherein, when the regulating circuit of described low quiescent current being started when reaching described predetermined operation time period by described clock circuit, the regulating circuit of described low quiescent current imports in described sensor, transceiver and the control circuit each with energy, to move described sensor, transceiver and control circuit.
12. system as claimed in claim 11, also comprise the energy of communicating by letter with the regulating circuit of described low quiescent current, wherein, the described energy provides the energy that is imported to described sensor, transceiver and control circuit in described predetermined operation time period by the regulating circuit of described low quiescent current.
13. system as claimed in claim 12, wherein said capacitor is communicated by letter with described clock circuit, and when starting the regulating circuit of described low quiescent current by described clock circuit, provide energy for described clock circuit, and continue as described clock circuit energy is provided, till restarting the regulating circuit of described low quiescent current by described clock circuit.
14. described capacitor wherein, is selected by system as claimed in claim 13, so that the voltage falling at described capacitor two ends is minimum during the regulating circuit that starts described low quiescent current.
15. system as claimed in claim 8, also comprise the transmission power adjustment circuit of communicating by letter with described control circuit, wherein, when signal intensity is lower than ideal tensile strength, described transmission power adjustment circuit increases the output power of described transceiver circuit, and when described signal intensity when well receiving required intensity, then reduce the described output power of described transceiver circuit.
16. system as claimed in claim 8, wherein said repeater comprises solar panel.
17. one kind is used for monitoring that in safe in essence mode the system of the leakage of underground tank comprises:
The assets interface arrangement, described device comprises:
Clock circuit, described circuit start predetermined operation time period with the regulating circuit of the low quiescent current of described device off and on;
Be connected to the capacitor of the output of described regulating circuit, wherein, in described predetermined operation time period, described capacitor charged, till the voltage level of described capacitor reaches the upper limit;
With the sensor circuit that described clock circuit is communicated by letter, the wherein said sensor circuit pair service data relevant with described underground tank responds;
With the transceiver circuit that described sensor circuit is communicated by letter, wherein said transceiver circuit sends and receives described service data in described predetermined operation time period;
Communicate by letter with described sensor circuit and described transceiver circuit and be in control circuit between the two, in the described predetermined described service data of operation time period internal conversion, wherein said clock circuit, sensor circuit, transceiver circuit and control circuit are separately as the ultralow circuit operation of current drain, this makes described assets interface arrangement can be attributed to the rank of safety in essence, do not surround described clock circuit and need not rely on, sensor circuit, the housing of transceiver circuit and control circuit is realized the described rank of safety in essence
The data link of communicating by letter with described assets interface arrangement, wherein, described data link received described service data and retransmits described service data in the described scheduled operation period in the described scheduled operation period;
With the data gate that described assets interface arrangement is communicated by letter with described data link, in the period, described data gate detects the described service data that has sent and resends described service data at described scheduled operation; With
With described data gate server in communication, wherein said server receives described service data and service data is sent to described data gate from described data gate manages described underground tank, wherein said underground tank comprises the controllable device of communicating by letter with described assets interface arrangement, so that described underground tank is implemented described management, and described service data is to transmit by each step that communicates between described assets interface arrangement, described data gate and described server via wireless network, and wherein said server configures becomes to accept http protocol.
18. system as claimed in claim 17, wherein, described each step that communicates between described assets interface arrangement, described data gate and described server via wireless network comprises:
(a) will be packaged into grouping by the described service data that described network sends at described assets interface arrangement place, wherein said grouping comprises a plurality of continuous positions;
(b) be that described a plurality of continuous position makes up preamble at described assets interface arrangement place, wherein said preamble comprises predetermined bit pattern;
(c) send the described grouping with described preamble from described assets interface arrangement by first radio-frequency channel, wherein said preamble and described a plurality of continuous position are sent with predetermined Bit Transmission Rate by described assets interface arrangement;
(d) send the described grouping with described preamble from described assets interface arrangement by second radio-frequency channel, wherein said preamble and described a plurality of continuous position are sent with predetermined Bit Transmission Rate by described assets interface arrangement;
(e) determine the described predetermined bit pattern of the described preamble that sends by described first radio-frequency channel in described data gate, to be combined into described a plurality of continuous definite reference position according to described predetermined hyte;
(f) when determining that for the described a plurality of continuous position that sends by described first radio-frequency channel described reference position is failed, determine the described predetermined bit pattern of the described preamble that sends by described second radio-frequency channel in described data gate, to be combined into described a plurality of continuous definite reference position according to described predetermined hyte;
(g) in the described a plurality of bit pattern of sampling of described data gate, wherein said data gate is with sample in described a plurality of continuous each of predetermined position sampling rate, and described predetermined position sampling rate is greater than described predetermined Bit Transmission Rate, makes at sampled each a plurality of samples of described a plurality of continuous positions of each sampling period of the described a plurality of continuous position of described grouping; And
(h) respond packet is sent to described assets interface arrangement by described first and second radio-frequency channels from described data gate.
19. system as claimed in claim 18, wherein, described each step that communicates between described assets interface arrangement, described data gate and described server via wireless network also comprises:
(i) for each position of the described a plurality of continuous position that receives in described data gate,
(1) ignores the sample of predetermined number in each of described a plurality of continuous position that the beginning of described sampling period is partly sampled;
(2) be kept at each the sample of predetermined number of described a plurality of continuous position of the center section sampling of described sampling period;
(3) ignore the sample of predetermined number in each of the described a plurality of continuous position of the latter end of described sampling period sampling;
(4) handle each the preservation sample of described predetermined number of described a plurality of continuous positions, to determine each binary condition of described a plurality of continuous positions; And
(j) according to each the described grouping of described binary condition reconstruct of the described a plurality of continuous position of in step (i) (4), determining;
(k) form the UDP grouping comprise from first header of the grouping of described reconstruct;
(l) described UDP grouping is sent to described server from described data gate; And
(m) at described server executive routine, described program may further comprise the steps:
(1) receives described UDP grouping;
(2) described UDP grouping is extended for ascii string;
(3) predetermined information is added described ascii string, to form effective HTTP request row; And
(4) described HTTP request row is submitted to described server.
20. system as claimed in claim 17, wherein, when the regulating circuit of described low quiescent current being started described predetermined operation time period by described clock circuit, the regulating circuit of described low quiescent current imports in described sensor, transceiver and the control circuit each with energy, to move described sensor, transceiver and control circuit.
21. system as claimed in claim 20, also comprise the energy of communicating by letter with the regulating circuit of described low quiescent current, wherein, the described energy provides the energy that is imported to described sensor, transceiver and control circuit in described predetermined operation time period by the regulating circuit of described low quiescent current.
22. system as claimed in claim 21, wherein said capacitor is communicated by letter with described clock circuit, and when starting the regulating circuit of described low quiescent current by described clock circuit, provide energy for described clock circuit, and continue as described clock circuit energy is provided, till restarting the regulating circuit of described low quiescent current by described clock circuit.
23. the system as claimed in claim 22 wherein, is selected described capacitor, so that the voltage falling at described capacitor two ends is minimum during the regulating circuit that starts described low quiescent current.
24. system as claimed in claim 17, also comprise the transmission power adjustment circuit of communicating by letter with described control circuit, wherein, when signal intensity is lower than ideal tensile strength, described transmission power adjustment circuit increases the output power of described transceiver circuit, and when described signal intensity when well receiving required intensity, then reduce the described output power of described transceiver circuit.
25. system as claimed in claim 17, wherein said repeater comprises solar panel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53737904P | 2004-01-16 | 2004-01-16 | |
| US60/537,379 | 2004-01-16 | ||
| US10/926,708 | 2004-08-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1930594A CN1930594A (en) | 2007-03-14 |
| CN100481145C true CN100481145C (en) | 2009-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005800077534A Expired - Fee Related CN100481145C (en) | 2004-01-16 | 2005-01-13 | System and method for remote asset monitoring |
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| CN (1) | CN100481145C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8416096B2 (en) * | 2009-04-02 | 2013-04-09 | Utc Fire & Security Americas Corporation, Inc. | System and method of controlling indicators of a property monitoring system |
| US8818740B2 (en) * | 2010-02-17 | 2014-08-26 | Pentair Thermal Management Llc | Sensor-powered wireless cable leak detection |
| US9377340B2 (en) * | 2011-11-11 | 2016-06-28 | Rosemount Tank Radar Ab | Monitoring of floating roof tank |
| CN106647607A (en) * | 2016-12-29 | 2017-05-10 | 济南广域软件有限公司 | Intelligent petroleum production management system |
| CN108254037A (en) * | 2016-12-29 | 2018-07-06 | 天津市华衡伟业称重系统股份有限公司 | A kind of large size metering and measuring equipment |
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