FR3085779A1 - SYSTEM, METHOD AND DEVICE FOR COMMUNICATING MEASUREMENT DATA OF A PARK OF MOVABLE PARTS. - Google Patents

Abstract

The present invention relates to a system and a method for communicating measurement data of a fleet of movable parts, from modules removably fixed on the parts. Each module includes a battery, an accelerometer, means of communication by low-frequency electromagnetic waves at at least one remote client station, means for sensing a physical quantity and / or positioning, and calculation means arranged for transmitting messages. over the course of their generation, at a frequency determined at the remote client station, depending on the state of movement of the part and / or a profile of shipments. A reminder message to the remote station comprising a request for acknowledgment of the messages received by the remote station is sent and depending on the result the module calculation means transmit at least part of the measurement data corresponding to the messages not received.

Description

SYSTEM, METHOD AND DEVICE FOR COMMUNICATING MEASUREMENT DATA OF A PARK OF MOVABLE PARTS.

The present invention relates to a system for communicating data of measurements of a fleet of movable parts, comprising at least one module which can be fixed to one of said parts.

It also relates to a method of implementing the system and to a device implementing said method.

It finds a particularly important although not exclusive application in the field of the collection of information measured in situ over a long period of time and retransmitted for storage and / or processing by an end user and in particular for the monitoring of position and measurement. over time of a set of parts.

By long period of time is meant more particularly here, a duration of the order of for example a few months and which can go up to several years, for example more than three years.

By way of example, the invention finds an application in the field of buildings and public works in which a fleet of machines and parts (formwork, skips, winch or any other) are moved from site to site and immobilized on the latter. for a fairly long period, for example more than a year.

Another field of application of the invention, which is particularly interesting, is that in which the certainty of the integral and complete nature of the data is paramount, for example in fields as diverse as logistics, verification of the cold chain, acquisition of biological and / or medical data for analysis, security and management of equipment.

The invention is also particularly useful in the field of communication where a small number of messages can be sent per day and where these messages have a low payload, for example of a few bytes, for example less than 12 bytes.

When it is desired to acquire physical measurement data from a mobile device and transmit them to remote calculation means for processing, it is known to use means of communication by electromagnetic waves.

These means consume a great deal of electrical energy and therefore do not allow the devices to be used in electrical autonomy over long periods of time.

There are already known (EP 2 942 244) systems for locating a transmission module using a low speed and low consumption network in which after awakening of the transmission means by an accelerometer, a GPS position thereof is transmitted .

Such systems nevertheless have drawbacks.

They are in particular intended for anti-theft functions and are therefore inseparable from the object for which they provide this function. They are not reusable and / or re-assignable to another device to be monitored.

They do not allow a global tracing of the positions and even less any transfers of physical quantities.

In particular, these systems generate only an individual alert but do not centralize the information for processing information relating to an entire fleet of movable parts.

They are also sensitive to disturbances and noises and do not guarantee the availability of all data, even after a specified time.

The present invention aims to provide a system, a method and a device which respond better than those previously known to the requirements of practice, in particular in that it will make it possible to communicate all the data of a fleet of disparate parts and / or evolving over time, centrally, with a very small footprint, the data set being able to be of different natures and dated precisely in time, while having a guarantee of reception of the entirety of the data after a time determined and this at low cost and independently and economically in electrical energy.

It allows use and operation without the need for recharging for a very long period of several years even with continuous use. This autonomy is more configurable and adaptable to the needs of the user and / or the conditions of use for its optimization and this including during use and without the need to physically access the device.

To this end, the invention proposes in particular a system for communicating data of measurements of a fleet of movable parts, comprising at least one module which can be fixed to one of said parts, the module comprising a battery, an accelerometer arranged to detect a state of moving or stopping said piece, means of communication by low frequency electromagnetic waves at at least one remote client station, calculation means comprising clock means, and said at least one client station, characterized in that the communication means are arranged to send and / or receive data, in that the calculation means comprise a non-volatile memory, in that the fixable module is detachably so on said movable part, in that '' it comprises means for sensing a physical quantity and / or for positioning, in that the calculation means are arranged for recording in the memory the data of measurements generated by the sensor means and for transmitting messages at a determined frequency to said remote client station, via the communication means and as a function of the state of movement of the part and of a sending profile previously introduced in the

memory, ways calculations transmitting of messages to wire of their generation, at least a message including of data from

measurement, if the accelerometer detects a movement and / or if a determined sensor detects a critical measurement, and otherwise transmits a reminder message to the remote station comprising a request for acknowledgment of the messages received by said remote station which responds with a message of response comprising at least one datum for receiving said messages, in that as a function of said response message, the module calculation means are arranged to transmit at least a determined part of said measurement data corresponding to messages not received, and in that said client station is arranged to collect in a second memory the measurement data of the modules of the fleet.

By movable, we refer here in particular to mobile objects for the needs of their use, independently or not, over distances which can range from around ten meters to several hundred, even thousands of kilometers.

The term “low frequencies” is understood more particularly to mean the low frequencies used in the field of communications by electromagnetic waves and more particularly the frequencies, for example less than one gigahertz, for example less than 900 MHz.

By physical quantity is meant any effect that is measurable and / or quantifiable independently and / or automatically. These physical quantities can also be here chemical measurements.

By way of nonlimiting example, these quantities can be the positioning or the absolute location (land surface) or relative (for example of an airplane on the tarmac of an airport with respect to its hangar) of an object, the temperature , the level of a liquid, the pH, the rate and / or the concentration of a chemical species, the quantity of moles, the pressure, the mass and / or the weight, the magnetic and / or electric field, the amperage, voltage, power, rate of use and / or displacement of an object, detection of shocks and / or vibrations, and / or inclination.

The term message more particularly designates here a set of structured information comprising a portion of data for routing and / or structuring of data (header), and a payload in which information, in particular binary information, including the combination, depending on the context, corresponds to a given.

The term profile is also understood more particularly here as a structured set of corresponding data and / or from which configuration data can be extracted, here from the sending of a message, such as for example the frequency of sending, the dating of sending. , the waiting time between two shipments and / or the criteria triggering the shipment.

With the invention it is in particular possible to guarantee 100% that the information recorded by the module's sensors (a position, a temperature, a shock, etc.) will be transmitted and well received on the remote station, with a history for example up to 24 hours.

In other words, the module, in its daily operation, transmits messages to the remote station in a natural way, for example every minute when it is in motion (GPS position) or an event on board requires sending information (a shock for example).

At the end of a mission, in general the end of a journey, that is to say when the module is stationary, sends an acknowledgment request to the server.

If the remote station receives this acknowledgment request - that is to say that it is in a network coverage area -, it sends back a time stamp of the messages received - that is to say: I received 1 message at 8:10 a.m., 1 message at 8:50 a.m., and 1 message at 2:40 p.m.-, the module then compares in its memory what it sent, and retransmits afterwards all the messages that would not have been received by the remote station .

In one embodiment of the invention, the descending messages -therefore those sent from the remote station to the module-, for example, only make 8 bytes of payload, a 24-hour day is then segmented into 3 sectors of approximately 9 hours, and a message timestamp is arranged so that the communication between the module and the remote station is functional and operational.

The invention therefore makes it possible to guarantee that even in the local absence of a low frequency network (for example Sigfox), or if the emission conditions are not optimal (Dopler effect when the module is moving, or a shock in a parking lot ), it is still possible to guarantee users the transmission of data recorded by the sensors, for example over a period of up to 24 hours of history.

This allows, for example, to present the complete route, of a truck traveling on the highway, the GPS chip not being disturbed by the movement (the module records the route perfectly). It sends the information every 10 minutes (2 GPS points per message), and compares the messages received at the end of the journey.

In advantageous embodiments, use is also made of one and / or the other of the following provisions:

- the determined frequency of sending messages to said client station is less than or equal to 200 messages per day and / or the payload of each message in less than or equal to 12 bytes.

In one embodiment, for a given type of messages, for example during a retransmission of messages, the specific sending frequency of retransmission can be fixed or variable and can also be equal to the determined sending frequency and / or alternatively, more than 1 message every 30 seconds, for example every minute or every two or three minutes.

By low bit rate is meant a low bit rate for example comprised in the lower 20% of the bit rate band in the field of electronic communication, for example less than 1000 bits / s;

- the payload of each message is between 10 and 12 bytes;

the sensor means comprise at least one measurement means in the assembly: temperature probe, pressure probe, flow probe, longitude measurement, latitude measurement, pH, measurement of the electrical consumption, magnetometer;

- the sensor means comprise at least one GPS.

The term GPS (acronym for Global Positioning System) is used here in a generic sense representing any system for determining coordinates and / or geolocation from satellite data independently of the network,

frequencies and of operators used. AT title example, GPS East heard as well as the GPS system than GALILEO, GLONASS and / or BEIDOU, IRNSS, or any other;

- the messages include an entire GPS measurement and a differential GPS measurement.

- The module comprises second means of high frequency and / or high speed communication;

The invention also provides a method using a system as described above.

It also proposes a method of communicating measurement data of a fleet of movable parts, comprising at least one module which can be fixed to one of said parts, the module comprising a battery, an accelerometer arranged to detect a state of movement in movement or at stopping said room, means of communication by low frequency electromagnetic waves arranged to send and / or receive data with at least one remote client station, calculation means comprising a non-volatile memory and clock means, in which,

the module is fixed removably on one of said parts, measurement data is generated by sensor means of a physical quantity and / or of positioning of the module,

- the measurement data generated by the sensor means are recorded by calculation means in the memory, messages are transmitted at a determined frequency to said remote client station if the accelerometer detects a movement and / or a determined sensor detects a critical measurement , via the communication means and as a function of the movement state of the part and / or of a sending profile previously introduced into the memory, the calculation means sending messages over the course of their generation, at least one message including measurement data,

if the accelerometer does not detect any movement and / or according to a determined periodicity, a reminder message is sent to the remote station comprising a request for acknowledgment of the messages received by said remote station,

the module is answered by the remote station with a response message comprising at least one piece of data for receiving said messages,

- As a function of said response message, messages are transmitted by the module comprising at least a determined part of said data corresponding to messages not received, and measurement data from the fleet modules are collected in a second memory of said client station.

The determined periodicity for sending reminder messages can be zero and in this case no sending is made, or at fixed or variable periodicity (depending on determined parameters) and can be a few minutes, a few hours or a day for example.

Advantageously, the sensor means being means for measuring geographic coordinates, the coordinate measurements are acquired at a frequency at least twice the determined frequency of transmission of messages to the remote station, a first measurement and a second measurement are acquired and the message to send which includes the entire measured coordinates of the first measurement and the data corresponding to the deviations of the coordinates of the second measurement from the first measurement.

The invention also provides a device implementing the method as described above.

It also offers a measurement data communication module which can be fixed removably on a movable part, said module comprising a battery, an accelerometer arranged to detect a state of movement in movement or when said part is stopped, means for communication by low frequency electromagnetic waves arranged to send and / or receive data, calculation means comprising a non-volatile memory and clock means, characterized in that the fixable module is detachably so on one of said parts, in that it comprises sensor means of a physical quantity and / or of positioning, in that the calculation means are arranged for recording in the memory the measurement data generated by the sensor means and for transmitting messages to a determined frequency and at a remote client station, via the means of communication and according to the state of movement of the pi this and a sending profile previously introduced into the memory, the calculation means sending messages over the course of their generation, at least one message comprising measurement data, if the accelerometer detects a movement and / or if a determined sensor detects a critical measurement, and if not sending a reminder message to the remote station comprising a request for acknowledgment of the messages received by said remote station, arranged to receive a response from the remote station by a response message comprising at least one datum of reception status of said messages, and in that as a function of said response message the module calculation means transmit by messages at least a determined part of said measurement data on request from the station, and in that the module is arranged to synchronize the measurement data in a second memory of said client station arranged to collect the measurement data of the modules of the fleet.

By synchronize is meant more particularly here a synchronization of data in the computer sense, namely a mechanism which aims to maintain the consistency of such data.

Advantageously, the removable module is lockable on the module in a secure manner, for example by screwing or by a unique key making it possible to avoid its movement without authorization. It can also be provided with a button under the module which sinks in contact with the part to be monitored, making it possible to signal the positioning on the part of said module or not, by any suitable electronic means.

The invention will be better understood on reading the following description of embodiments given below by way of nonlimiting examples. The description refers to the accompanying drawings in which:

Figure 1 schematically shows an embodiment of a system according to the invention applied to a fleet of construction trucks.

FIG. IA is a top view of an open module according to an embodiment of the invention.

Figure 2 is an example of a message exchange sequence between a module (attached to a scooter) and a remote station, illustrating the implementation of the method in an application of the invention.

FIG. 3 schematically shows an example of a message architecture usable with the invention.

FIG. 4 illustrates a diagram of steps of the method according to an embodiment of the invention.

FIG. 5 shows an example of display of the data collected by an end user of a data communication system according to an embodiment of the invention, in the case of path tracking of a module.

FIG. 6 is an example of a route, for example of a technical truck for monitoring a bicycle race, showing positions which were transmitted and received by the remote server, during the route, and crosses representing points which were re-issued afterwards, because they were not received by the server during the journey.

FIG. 1 shows a system 1 for communicating measurement data acquired from a set or fleet of movable parts 2.

The movable parts 2 can be of any kind and are, in the embodiment described here, public works skips.

The buckets 2 are fixed on the backs of trucks, for example removably.

Each part 2 comprises a module 3, removably fixed to said part, for example by screwing, bolting, or any other means known to those skilled in the art.

The modules can be removed for maintenance, reassignment to another movable part and / or replacement.

More specifically, and before completing the description of Figure 1, we will describe an embodiment of a module 3 according to the invention with reference to Figure IA.

FIG. 1A shows a module 3 provided with a parallelepiped shell 4 comprising a base 5 and a cover 6, separable from one another. The shell 4 is for example made of plastic to limit the electromagnetic interference, and is produced for example by sintering.

The base 5 comprises two ears 7, 7 'each provided with a through hole 8, 8', for screwing or bolting on the corresponding movable part 2.

It also includes orifices 9, for example blinds and arranged to be placed opposite orifice 10 of the cover 6 for securing said cover 6 and the base 5, for example by screwing through orifices 9 and 10 correspondents.

The shell 4 thus comprises, once the base 5 and the cover 6 assembled and secured, an interior space for receiving the electronic means 11 and ensures their protection and a seal against dust and / or moisture.

The electronic means 11 comprise a source 12 of electrical power.

The source 12 of electric power comprises at least one battery 13, for example comprising two electric cells.

By way of example, the batteries used can be lithium batteries, thus allowing a long duration (several years) in intermittent use as with the invention, and thermal resistance over a wide temperature range, such as for example, batteries sold by VARTA under the reference CR 123 A and / or those sold by SAFT under the references LS17330 or LS14500.

In one embodiment, the power source 12 comprises at least one solar panel.

The power source 12 supplies electrical energy to calculation means 14 comprising clock means (not shown).

The calculation means 14 are connected to other electronic elements for example by a data bus (not shown) known per se to those skilled in the art, for example complying with the I2C standard (acronym for Inter-Integrated Circuit, in English) , for example in its sixth version of April 2014.

The electronic means 11 may consist of several separate and assembled elements or be integrated into an integrated component such as for example the module referenced TD1205P and marketed by the French company TELECOM DESIGN or any compatible component marketed by the company SIGFOX ™ and / or its partners.

The data bus connects the calculation means 14 to an accelerometer 15 arranged to detect a state of movement in motion or at stop of the module 3 and therefore of said part 2.

The accelerometer 15 generates and / or updates the displacement state data corresponding to the fact that the part 2 movable via the truck is in motion.

The updating is carried out continuously or substantially continuously, for example in less than five tops of the clock means, for example in a clock top.

The calculation means 14 compare the intensity measured by the accelerometer 15 with an acceleration intensity threshold and if the measured value is greater than said threshold, they attribute to the displacement state data the value "IN MOTION" , and the value "IMMOBILE" otherwise.

The electronic means 11 also include means 16 sensors. The means 16 sensors form measurement means and are capable of detecting and / or measuring a physical and / or chemical and / or positioning quantity to generate measurement data.

The measurement means 16 comprise all types of sensor, for example at least one sensor means in the assembly: temperature probe, pressure probe, flow probe, longitude measurement, latitude measurement, pH measurement, consumption measurement electric, magnetometer, hall effect probe.

In the embodiment described in FIG. 1A, they further comprise at least one means 16 ′ for terrestrial positioning, for example satellite, for example a GPS.

The means 14 for calculating the electronic means 11 comprise a first memory 17, for example non-volatile, allowing in particular the recording, and the conservation, of the data generated by the sensor and / or measurement means.

The measurement data are recorded directly, during their generation, in the first memory 17 by the calculation means 14, said calculation means 14 recovering the data measured in said memory 17 during their exploitation and / or transmission.

The data bus also connects the calculation means to communication means 18.

The communication means 18 transmit and / or receive the data by electromagnetic waves 19.

Waves communication uses frequencies in the low frequency band. The low frequencies are those known per se to those skilled in the art and are, for example, between 1000 MHz and 500 MHz, for example between 950 MHz and 800 MHz, for example 868 MHz.

The frequency band used is spread over a frequency band of small width, for example less than 500 Hz, for example less than 200 Hz, for example 100 Hz. The bandwidth can be understood in the field known to a person skilled in the art under the name of ultra bandwidth

narrow (U.N.B acronym of Ultra Narrow Band in

English).

In one embodiment, the module comprises second communication means 20. These second

20 means of communication are at high frequency

and / or broadband.

The second means 20 communications

operate on a centered frequency greater than two gigahertz and / or with a bit rate greater than 1000 bits per second.

They communicate by following example communication protocols wireless such as those

known to those skilled in the art under the WIFI brands or according to the Bluetooth standard.

We will now do new reference to the

figure 1.

The waves emitted by first and / or second means of communication are picked up by

telecommunication antennas 21, 21 ′, for example fixed.

These antennas 21, 21 'are themselves connected to a communication network (not shown) by electromagnetic and / or wired waves and / or serve as electromagnetic relays for communication.

The waves are routed to communication means (not shown) of at least one remote client station 22.

The remote station 22 is for example a computer and / or a server.

The communication means 18 are arranged to send (direction of ascent - arrow 23) and / or receive (direction of descent - arrow 24) data to and / or from said means of communication from the remote client station 22 .

Said client station 22 is arranged to collect in a second non-volatile memory 25, the measurement data of the modules 3 of the fleet. The measurement data are transmitted by the modules and received by their communication means.

The remote client station 22 includes calculation means (not shown) for processing the data received and that to be transmitted.

The data sent and / or received between the communication means 18 of the modules and the communication means of the remote client station are organized into messages 26.

The messages 26 are transmitted at a determined frequency.

The determined frequency is for example a message every two minutes, for example less than a message every five minutes, or for example a message every ten minutes.

The calculation means 14 of the module 3 verify the data generated by the accelerometer 15 to detect a movement.

Depending on the state of displacement of the module 3, and therefore of the movable part 2, and of a sending profile (not shown), previously introduced into the memory 17 of said module 3, the module 3 therefore sends at least a message 26 to the remote client station 22.

The calculation means 14 transmitting messages 26 if the accelerometer 15 detects a movement, at least one of said messages 26 comprising measurement data as they are generated, and if not transmits at least a determined part of said measurement data on request from the remote client station 22.

The sending profile is a set of structured data, stored in a memory of the module, for example in the first memory 17 of the module 3 calculation means.

The sending profile includes configuration data for the sending of data by the module 3.

The sending profile can, for example, be modified by the remote client station 22 by descending messages 27, via the latter's communication means with the modules 3.

This data set includes, for example, a data frequency for sending messages 26 from the module 3 to the remote station 22, the measurement data or data to be sent and at what frequency, the duration of immobility making it possible to consider that the module 3 is stationary or in motion for the characterization of the state of displacement of the module 3.

In a first phase, the module 3 fixed on the bucket is set in motion by the truck.

As it moves, the positioning measurement means acquire, for example, GPS coordinates from satellites 28.

The accelerometer acquires an acceleration and by comparison with the acceleration threshold included in the sending profile, generates the data "IN MOTION".

In one embodiment, the sending profile also includes first travel time threshold data.

The travel time threshold is for example expressed in minutes or in number of acquisition steps of the accelerometer.

The calculation means 14 then compare, for example continuously, the time during which the displacement state data is equal to "IN MOTION". When the movement time exceeds the threshold, the communication means 18 of the module 3 send messages 26 continuously as and when they are formed and / or generated and each comprising measurement data.

In one embodiment, the sensor means comprise at least one critical data sensor.

Critical data is the data from said sensor and considered to require information and / or action from its advent.

By way of example, the temperature for transporting organs for example, and / or exceeding a specific threshold of the accelerometer defining a shock of the movable part can be critical data.

A specific data message can then be sent, directly upon detection and / or respecting the determined frequency of sending messages.

In the embodiment more particularly described here, the messages 26 are sent from the module 3 to the server or remote station 22 (upstream direction 23) without acknowledgment of receipt from the server 22.

The first time threshold is for example less than 15 min, for example less than 10 min, for example 5 min.

The calculation means 14 introduce and store in the first memory 17 of the module 3 on the one hand the measurement and / or positioning data contained in the message 26 sent, and on the other hand a status data item for sending the message 26 correspondent.

For example, the status data for a given message is a bit whose state or value is "1" if the message has been sent and "0" otherwise.

In a second phase, the truck stops for example in the garage 28 'of a site.

The accelerometer 15 then generates a displacement state equal to "IMMOBILE".

The sending profile comprising a second immobilization time threshold datum, the calculation means 14 then compare the number of successive samples acquired with the value "IMMOBILE" to the second corresponding threshold datum. If the number of “IMMOBILE” samples is greater than the second threshold, the module 3 sends the server 22 a so-called reminder message 29.

The reminder message 29 is a message of a different type from the measurement messages 26 and includes an interrogation of the server 22 so that the latter returns the identification of the last message 26 received.

Each measurement message 26 is time-stamped. The reminder message 29 includes an identification datum corresponding to the last messages 26 sent.

In one embodiment, the identification data is generated from at least a division of the day into several time slots.

For example, each 24-hour day is divided into corresponding equal time intervals. A time interval corresponds to the frequency of sending messages chosen by the user of the modules 3 and / or to the maximum frequency authorized by the network and / or the message transport protocol 26, 29.

By way of illustration, for a user of the telecommunications operator known to a person skilled in the art under the name Sigfox, the user can use the frequency band only one percent of the time.

However, a Sigfox message takes 6 seconds to be sent (each message being sent 3 times for 2 seconds, that is to say once on the 3 frequency bands: minimum (868.034 MHz), medium (868.130 MHz), and max (868.226 MHz)).

Therefore 140 messages maximum amounts per day as well as up to 4 messages descending per day can be sent, or 144 messages per day and per user. The network therefore allows a frequency of one message every ten minutes.

The day can be partitioned into a determined number of sectors, for example each comprising the same number of multiples of the frequency of sending messages.

The determined number of sectors is for example greater than two, for example three:

A first sector can correspond to the ten minute intervals from midnight until 9:10 a.m.,

A second sector can correspond to the ten-minute intervals from 9.20 am until 6.30 pm,

A third sector can correspond to ten-minute intervals from 6:40 p.m. until 12:50 a.m.

Each sector is identified by sector data and the time stamping makes it possible to uniquely identify a message over a day by the time slot to which it belongs.

For example, the hourly value corresponding to a message created at 5:40 p.m. is 106 since there are 6 slices per hour: 17 * 6 + 4 = 106.

In a first case illustrated for another embodiment with reference to Figure 2, a module 3 fixed to a scooter 30 moves.

The positioning means 16 ′ (see FIG. IA) acquire a first GPS position at a frequency twice that of sending messages, in this embodiment 5 minutes.

The positioning means 16 ′ therefore acquire a second position after ten minutes and the communication means 18 generate a message 26 to the computer 22 comprising the two positions.

The sending is repeated as long as the scooter 30 is in motion.

When the latter arrives at the end 31 of the journey and is stationary, the communication means 18 emit a reminder message 29 indicating, for example the number of messages sent, here "28 GPS points have been sent".

The server 22 responds by sending to the module 3 (descending message 32) data comprising all the statuses of the messages 26 received for the selected sector.

More precisely, in one embodiment, a message is considered to be in two states, either "received" or "not received".

We associate a bit value equal to 1 for the "received" state and to 0 for the "not received" state.

The response message 32 from the server 22 is sent to the interrogator or request transmitter module 3 and corresponds to the aggregate of the reception status of the various messages 26 transmitted in chronological order.

By way of example, if the response from the server 22 for a callback request 29 corresponds to the first sector (midnight until 9:10 am) has for value a sequence of bits starting with "1110101 ..", the means 14 for calculating the module deduces that the server 22 has:

- well received the first three time-stamped messages OOhOO, OOhlO, 00:20, the fifth time-stamped message 00:40 and the seventh time-stamped 01:00, but,

- did not receive the fourth and sixth messages with time stamps 00:30 and 00:50 respectively.

In the embodiment described here, the server replies "I received these 12 GPS points" and transmits to module 3 the binary sequence for the identification of these twelve points received and those missing.

The module calculation means 14 then compare the message 32 from the server 22 in response to the reminder message 29 with the sending status data 10 saved in the first memory 17 of the module 3.

By way of example for the second sector, the comparison is carried out according to the following table 1:

Timestamp 3 p.m. 30 3 p.m. 40 3 p.m. 50 4 p.m. 4 p.m. 10 4 p.m. 20 4 p.m. 30 Content of the server message . . . 1 0 0 0 0 1 0 . . . Content of module sending statuses . . . 1 1 1 0 0 1 1 . . . Action to be taken by the module . . . okay to retransmit to retransmit - - okay to retransmit . . .

Table 1

Thus, once the correspondence between the sending bit and the receiving bit has been established by time stamp equality, the calculation means 14 determine the action to be taken.

In table 1, for the timestamps "3.30 pm" and 4:20 pm a message 26 has been sent (bit at "1") and a message 26 has been received (bit at "0"), no retransmission is therefore to be carried out by module 3.

For the timestamps "16h" and "16h00", no message 26 was received but no message was sent, no retransmission is therefore to be carried out by module 3. It is also possible to configure module 3 so that it does not carry out any comparison when no message 26 has been sent since no message 26 can therefore be received.

For the time stamps “3:40 pm”, “3:50 pm” and “4:30 pm” a message 26 has been sent (bit to “1”) and no message 26 has been received (bit to “0”), the means 18 of communication retransmit messages 33 missing from their identification by time stamp.

The retransmission takes place as long as the module 3 is stopped.

The comparison is carried out for all the sectors or sector by sector for example after a determined latency period for a new sector.

In one embodiment, the module 3 waits for a response message 32 to the reminder message 29 for each sector.

The latency period is included in the sending profile and is, for example, between one minute to several hours.

The sending profile includes a frequency of sending messages 33 for retransmission.

The frequency of sending for retransmission is for example equal to the frequency of sending messages 26 and / or equal to or less than the maximum frequency authorized by the network and / or the message transport protocol, for example less than or equal to a message every 10 minutes.

In one embodiment, the sending frequency for retransmission can be higher than said frequencies, for example one sending every minute.

In one embodiment, the message sending status data are introduced into a buffer memory of the first memory 17 of the module 3 or into the random access memory of the calculation means 14. This buffer memory can record the data by sector for a duration for example of 24 hours per sliding window.

Once the buffer is full, the data from a new sector is saved to (instead of) data from the oldest sector.

To avoid data loss, once the comparison between messages 26 sent and received made by the means 14 for calculating the module 3 and the messages 33 to be retransmitted identified, these are retransmitted in chronological order by browsing the sector the older.

For example, if module 3 decides to start message re-transmission on July 14 at 15:15 (sector 2), the third sector (July 13 18: 40-23: 50) is chosen first, then the first (14 July

00: 00-9: 10) and finally the current sector 2 (July 14 9: 20-18: 30). This avoids overwriting or resetting the data corresponding to this sector as soon as it is re-accessed at 18:40.

In a second case, the module 3 sends a reminder message but the messages 26 do not reach the remote station 22.

For example (cf. Figure 1) the truck moves and sends messages (messages I to V) then it parks in the garage 28 'and sends messages VI and VII during the maneuver but the waves 19 do not pass.

The module 3 then sends reminder messages 29 (messages VIII and IX) at a determined attempt frequency but always without success.

The frequency of attempts determined is a data item contained in the sending profile and is less than or equal to the frequency of sending messages, for example less than one every 10 minutes, for example less than one every hour.

In one embodiment, the frequency of the attempt is a function of the time elapsed, for example inversely proportional thereto. For example, as long as the module 3 is stationary, the frequency of attempt is for example of a message every hour during the first three days of immobility of the module, then of a message per day during the first month of stillness, then one message per week.

Data messages 26 can continue to be sent during the immobility of module 3 or their sending can be inhibited.

When the truck is again in motion and that communication is again established between the communication means of module 3 and the remote station 22, module 3 resumes sending messages 26. Then the truck stops again and then issues a reminder message (message X). The remote station has not received messages II, III and VII and indicates this by a message 32 of response to the module.

The module retransmits the missing messages 33 (messages II, III and VII) for synchronization of the data with the remote station 22.

In one embodiment, the module sends all of the data not received, for example without comparing the messages sent and those received.

Also in one embodiment, the transmission of messages can be carried out by the second high-frequency communication means 34 of the module.

For example, messages for data synchronization (reminder message 29, server message 32 for comparison, retransmitted messages 33) are sent by these second communication means 34 when these are available.

The communication means 18, 34 being able to transmit in parallel, the module 3 can continue to send messages 26 of data generated progressively and synchronize the data not received at the same time.

We will now describe the data transmitted in messages according to an embodiment of the invention.

In Figure 3 is presented a table corresponding to a frame of a message.

The message includes a payload, here of twelve bytes. It is the IT weight of the maximum payload, for example for the user of a SigFox network mentioned above, excluding the headers and signal metadata which contain, for example, the authentication information of the module concerned.

Communication takes place, for example, at a speed of less than 1 Kbit / s, for example less than 400 bits / s.

In the embodiment, the data transmitted in the messages 26 are positioning data by GPS.

GPS positioning is performed by acquiring a datum 35 of latitude and a datum 36 of longitude.

Each message comprises at least one data item 37, 37 ′ of signs of the measurement and / or positioning data and said whole measurement data.

Message 26 also includes time stamp data 38.

In the embodiment described, the message 26 also includes data 39, 39 ′ of differential measurements.

Each datum 39, 39 'of differential measurements also includes a datum 37' ', 37' '' of signs.

The message of FIG. 3 thus comprises an entire GPS position (latitude and longitude) requiring 8 bytes, the time stamp of the sending of the message and two data encoding not the entire second position, but the difference in longitude and latitude from the second position relative to the first.

The remote station, on receipt of a message 26, recovers an entire data item and reconstructs by difference and signs the second position.

It is thus possible to generate an additional virtual measurement between two messages. For a message sending frequency of one every 10 minutes, the server has two measurement points, for example one every 5 minutes.

This mechanism makes it possible to encode and decode a GPS measurement and / or positioning at a frequency twice that of the frequency of sending messages.

The messages descending from the server to the module have for example a payload of 8 bytes for a sending frequency for example less than 10 per day, for example 4.

Descending messages are used for example for synchronization of data messages and / or for the remote configuration of the sending profile.

We will now describe a method according to an embodiment of the invention with reference to FIGS. 4 and 5.

A user wishes to acquire measurement and positioning data from a truck, for example comprising a refrigerated box for transporting foodstuffs.

The measurement data are for example the internal temperature of the box.

We fix (Step A - under step 1) for example a module on the box, by screwing. The cover of the shell of the module is opened by unclipping and the batteries are replaced, then an interface of means for measuring the internal temperature of the box is connected to the means of the module for measuring and acquiring said measured temperature before closing the module by clipping.

From a remote station, at least one sending profile configuration message is sent to the module which saves it in the first memory (Step A under step 2).

The configuration profile includes:

Message sending frequency data. The data is composite and includes a frequency of sending a message every ten minutes, one message out of two comprising a temperature acquisition and a temperature differential data and the other message out of two includes a data of

positioning and a differential data of positioning. we generate so measurement data of temperature and of positioning data of module (Step B) and we record by means of

calculations in the memory of the measurement data generated by the sensor means (Step C).

a first test is carried out (Test D). If the accelerometer detects a movement, the state of movement of the part is determined and a second test is carried out (Test E).

The second test determines whether the message to be sent includes measurement data and / or positioning data according to the configuration of the sending profile previously introduced in the module memory.

If the result of the second test is positive, the messages are transmitted at a frequency determined in the sending profile to the remote client station via the communication means (Step F).

As long as the displacement state is "MOVING" (test F '), the test steps E and step F are repeated.

If the accelerometer does not detect any movement and the result of test D is negative, a reminder message from the module is sent to the remote station (Step G) and the responding server by sending data from a list of missing messages , we send said missing messages (Step H)

It is then possible to collect in a second memory of said client station the measurement data of the modules of the fleet (Step I).

This data can for example be displayed on a display means of the remote station such as for example a screen.

The display means (cf. FIG. 5) present a geographic map 41 showing points 42 corresponding to each positioning datum.

It is for example possible to assign a color code to each temperature measurement in the second memory and to display it on the screen.

The user can thus check with a simple glance if the path 43 carried out conforms to that planned and if the temperature has for example not exceeded a temperature threshold.

He can also know where and when a possible temperature overshoot would have occurred.

The remote station can communicate with a fleet of modules and thus allow overall control of the measurement and positioning data of said fleet and perform processing on the data.

acquired. On the Figure 6 shows a mode of production an interface graphic means display from a remote station. The interface presents a menu geographical

including a truck ride.

The route is reconstituted after stopping and therefore a posteriori.

The route is made up of graphic elements indicating the position of the truck at a given time and date stamp.

The graphic elements can be circles 44, when the positioning measurement was received directly when the corresponding data was first sent and be a cross 45 when the measurement has been reconstructed and / or retransmitted after request for acknowledgment of the module and response from the remote station.

The interface thus includes, for example on one side, a list 46 of the measurements received and indicating 5 for each measurement whether it was received directly or deferred.

As is obvious and as also follows from the above, the present invention is not limited to the embodiments more particularly described. On the contrary, it embraces all the variants thereof and in particular those in which measurement and positioning data are transmitted in the same message, that or the networks, protocol or operator and the 15 standards in particular of communication implemented are different.

Claims (10)

1. A system for communicating data of measurements of a fleet of movable parts, comprising at least one module which can be fixed to one of said parts, the module comprising a battery, an accelerometer arranged to detect a state of movement in motion or at stop of said piece, means of communication by low frequency electromagnetic waves to at least one remote client station, calculation means comprising clock means, and said at least one client station, characterized in that the communication means are arranged for sending and / or receiving data, in that the calculation means comprise a non-volatile memory, in that the fixed module is detachably so on said movable part, in that it comprises sensor means a physical and / or positioning quantity, in that the calculation means are arranged to record in the memory the measurement data generated by the sensor means and to transmit messages at a determined frequency to said remote client station, via the means of communication and as a function of the state of movement of the part and of a profile of shipments previously introduced into the memory, ways calculations transmitting of messages to wire of their generation, at least a message including of data from measurement, if the accelerometer detects a movement and / or if a determined sensor detects a critical measurement, and otherwise transmits a reminder message to the remote station comprising a request for acknowledgment of the messages received by said remote station which responds with a message of response comprising at least one datum for receiving said messages, in that as a function of said response message, the module calculation means are arranged to transmit at least a determined part of said measurement data corresponding to messages not received, and in that said client station is arranged to collect in a second memory the measurement data of the modules of the fleet. 2. System according to claim 1, characterized in that the determined frequency of sending messages to said client station is less than or equal to 200 messages per day and / or the payload of each message in less than or equal to 12 bytes. 3. System according to claim 2, characterized in that the payload of each message is between 10 and 12 bytes. 4. System according to any one of the preceding claims, characterized in that the sensor means comprise at least one sensor means in the assembly: temperature sensor, pressure sensor, flow sensor, longitude measurement, latitude measurement, pH, power consumption measurement, magnetometer. 5. System according to any one of the preceding claims, characterized in that the sensor means comprise at least one GPS. 6. System according to claim 5, characterized in that the messages comprise an entire GPS measurement and a differential GPS measurement. 7. System according to any one of the preceding claims, characterized in that the module comprises second high frequency and / or high speed communication means. 8. Method for communicating measurement data of a fleet of movable parts, comprising at least one module which can be fixed to one of said parts, the module comprising a battery, an accelerometer arranged to detect a state of movement in motion or at standstill of said room, means of communication by low frequency electromagnetic waves arranged to send and / or receive data with at least one remote client station, calculation means comprising a non-volatile memory and clock means, in which, the module is fixed removably on one of said parts, measurement data is generated by sensor means of a physical quantity and / or of positioning of the module, - the measurement data generated by the sensor means are recorded by calculation means in the memory, messages are transmitted at a determined frequency to said remote client station if the accelerometer detects a movement and / or a determined sensor detects a critical measurement , via the communication means and as a function of the movement state of the part and / or of a sending profile previously introduced into the memory, the calculation means sending messages over the course of their generation, at least one message comprising measurement data if the accelerometer does not detect movement and / or according to a determined periodicity, a reminder message is sent to the remote station comprising a request for acknowledgment of the messages received by said remote station the module is answered by the remote station with a response message comprising at least one piece of data for receiving said messages, as a function of said response message, messages are transmitted by the module comprising at least a determined part of said data corresponding to messages not received, and - We collect in a second memory of said client station the measurement data of the fleet modules. 9. Method according to claim 8, characterized in that the sensor means being means for measuring geographic coordinates, the coordinate measurements are acquired at a frequency at least twice the determined frequency of transmission of messages to the remote station, we acquire a first measurement and a second measurement and the message to be sent is generated which includes the entire measured coordinates of the first measurement and the data corresponding to the deviations of the coordinates of the second measurement from the first measurement. 10. Communication module for measurement data removably fixed on a movable part, said module comprising a battery, an accelerometer arranged to detect a state of movement in movement or at stop of said part, means of communication by waves low frequency electromagnetic devices arranged to send and / or receive data, calculation means comprising a non-volatile memory and clock means, characterized in that the fixable module is detachably so on one of said parts, in that it comprises sensor means of a physical quantity and / or of positioning, in that the calculation means are arranged for recording in the memory the measurement data generated by the sensor means and for transmitting messages at a determined frequency and to a remote client station, via the means of communication and according to the state of movement of the part and a sending profile is previously introduced into the memory, the calculation means sending messages over the course of their generation, at least one message comprising measurement data, if the accelerometer detects a movement and / or if a determined sensor detects a critical measurement, and otherwise sending a reminder message to the remote station comprising a request for acknowledgment of the messages received by said remote station, arranged to receive a response from the remote station by a response message comprising at least one data item of reception status of said messages, and that according to said response message the module calculation means transmit by messages at least a determined part of said measurement data at the request of the station, and in that the module is arranged to synchronize the 5 measurement data in a second memory of said client station arranged to collect measurement data from the modules of the fleet.