EP2168102A1

EP2168102A1 - Method for transmitting information between vehicle identifiers

Info

Publication number: EP2168102A1
Application number: EP08761082A
Authority: EP
Inventors: Fabienne Masson; Jean-Claude Huth
Original assignee: Valeo Securite Habitacle SAS
Current assignee: Valeo Comfort and Driving Assistance SAS
Priority date: 2007-06-25
Filing date: 2008-06-16
Publication date: 2010-03-31
Also published as: CN101861602A; FR2917873B1; JP5139522B2; FR2917873A1; US20100191703A1; WO2009000695A1; JP2010532888A

Abstract

The invention relates to a method for transmitting information from a first identifying object (ID1) for a motor vehicle to a second identifying object (ID2), the said method comprising the steps of: activating a synchronization mode (MOD SYNC); opening a two-way communication session; and transmitting information from one identifying object (ID1) to another identifying object (ID2) according to a date associated with the information to be transmitted. Application: motor vehicle.

Description

METHOD FOR TRANSMITTING INFORMATION BETWEEN

VEHICLE IDENTIFIERS

Field of the invention

The present invention relates to a method of transmitting information of a first identifying object for a motor vehicle to a second identifying object, an identifying object allowing access to said vehicle, and a transmission device for carrying out said method.

It finds a particular application in the field of motor vehicles.

State of the art

In the case of a motor vehicle application, according to a known state of the art, when a user accesses via an identifying object, such as a portable hands-free badge, to a vehicle, information relating in particular to the vehicle may be recorded. in said identifying object, such as for example the tire pressure of the wheels or the fuel level. This information can be updated with each vehicle access, and therefore represent in this case the information during the last vehicle access by the user. This information is, for conventional badges, available at the vehicle manufacturer. A problem of this prior art is that in the case where there is a plurality of identifying objects for the same vehicle, the information contained in the two identifiers objects are not always the same if the user does not access to his vehicle with both identifying objects at the same time. As a result, the vehicle information may be obsolete in one of the identification objects and may lead to interpretation errors in the case, for example, of a manufacturer's diagnosis etc. In addition, constructor will no longer be able to know what information is updated during the last vehicle access and in which identifying object they are.

Object of the invention

The present invention aims in particular to solve the problem cited above and in particular to have accurate information corresponding to the last access véh icule in any identifying object.

According to a first object of the invention, this object is achieved by a method of transmitting information of a first identifying object for a motor vehicle to a second identifying object, an identifying object allowing access to it, and it process comprising the steps of:

- activate a synchronization mode;

- open a two-way communication session; and

transmitting information from an identifying object to the other identifying object according to a date associated with the information to be transmitted.

As will be seen in detail by the following, such a method has the advantage of obtaining updated information in all identifiers objects allowing access to the same vehicle, even if an identifying object has not itself read is the last access to the veh icule, thanks to a synchronization of information between identificating objects that communicate with each other.

In accordance with nonlimiting embodiments, the method further has the following features.

- Bi-directional communication is radio frequency. it allows two ID objects to communicate without consuming remotely.

A transm ission of information is based on a comparison of dates respectively associated with information included in the first identifying object and with information included in the second identifying object. This makes it possible to know that they are the most up-to-date information and in which identifying object.

- A date corresponds to information updated after an access to the vehicle by an identifying object. This makes it possible to know which is the identifying object that has last accessed the veh icule.

- The opening of a communication session is done after a check of a veh icule number. This allows an identifying object to communicate with other identifying objects that have access authorization to the same vehicle as read i.

- Activation of the synchronization mode is done manually. This is a simple way to trigger the synchronization of information in an identifier object with another identifier object.

- Information transmission is done in a plurality of packets. This allows a more modular information transmission. That is, information of the same type can be grouped together.

At least one date is transmitted when opening a bi-directional communication session. This allows to save execution time compared to transmitting a date after a login.

According to a second subject of the invention, it relates to a device for transmitting information of a first identifying object for a motor vehicle to a second identifying object, an identifying object allowing access to said vehicle, said device comprising: a control unit for:

- activate a synchronization mode;

- open a two-way communication session; and

According to a third object of the invention, it relates to an identifying object for automobile vehicle capable of transmitting information to another identifying object, an identifying object allowing access to said veh icule, and comprising:

a human-machine interface for selecting a synchronization mode;

a transceiver for physically transmitting information to another identifying object; and

an information transmission device according to the preceding characteristic.

According to a fourth subject of the invention, it relates to a computer program product comprising one or more instruction sequences executable by an information processing unit, the execution of said instruction sequences. allowing implementation of the method according to any one of the preceding features.

Brief description of the figures

Other features and advantages of the present invention will be better understood with the help of the description and non-limiting drawings, among which:

FIG. 1 represents a diagram of an information transmission between a first identifying object and a second identifying object according to a first non-limiting embodiment of the transmission method according to the invention;

FIG. 2 represents a first sequence of the diagram of FIG. 1;

FIG. 3 represents a second sequence of the diagram of FIG.

FIG. 4 represents a diagram of an information transmission between a first identifying object and a second identifying object according to a second non-limiting embodiment of the transmission method according to the invention;

FIG. 5 represents a first sequence of the diagram of FIG. 4; FIG. 6 represents a second sequence of the diagram of FIG.

FIG. 7 shows an alternative embodiment of FIG. 2; and

FIG. 8 is a diagram of the transmission device for carrying out the method of FIG. 1.

Detailed description of non-limiting embodiments of the invention The information transmission method according to the invention is described in a non-limiting embodiment in FIG. 1. In the example of FIG. 1, the process steps for two ID1 and ID2 ID objects are shown. An identifying object ID allows access to a motor vehicle. It is presented in non-limiting examples in the form of a badge, a key, a keyfob called "keyfob" etc. It generally comprises an I HM human-machine interface with a screen and an SCR menu, and an electronic module for transmitting a wireless signal to a receiver coupled to an on-board computer of the vehicle. Such identifying objects are known to those skilled in the art and are therefore not described here.

The method of transmitting information from an identifying object to another identifying object comprises, in particular, the following steps:

an awakening step UP;

a step of activating a synchronization mode MOD_SYNC; an ASK_SYNC synchronization request step in which a bidirectional communication session OPEN_SSRF is opened;

a step of transmitting information TXRX_SSRF; and

- a closing step CLOSE_SSRF.

The steps are described in detail below with reference to Figs. 2 to

7.

In these Figs. is represented an axis of the times T, and the different stages along this axis of time.

At time t0, we start from an initial state of an identifying object ID which is a standby state I DLE. In a first step 1), an identification object ID is awakened.

In the example of FIG. 2, the first identifying object ID1 is woken first at time t1, while the second identifying object ID2 is woken up after, at time t2.

The awakening is effected for example manually by means of an HMI man-machine interface of the identifying object ID described later in the description (for example by pressing a button), or automatically by means of waves. low frequencies whether contactless or contact when the identifying object ID is close to a low-frequency base said BF located in the vehicle for example. It can also be done automatically with a radio frequency signal said RF.

In a second step 2), a synchronization mode MOD_SYNC is activated which will make it possible to transmit information between ID identifier objects.

In a non-limiting example, the activation is done manually by means of the human-machine interface HMI of the identifying object ID described below.

In the example of FIG. 2, the synchronization mode MOD_SYNC is activated at time t2 for the first identifying object ID1 and at time t4 for the second identifying object ID2.

This manual activation makes it possible to consume less energy compared to an activation which would be automatic.

Of course, an activation of the automatic synchronization is also possible, but it requires more resources because it assumes the detection of an identifier in a zone and the implementation of an automatic two-way communication.

In a third step 3), an ASK SYNC synchronization is requested in the following manner. Regarding the first identifier object ID 1, the one that was woken up first, in a first substep 31), the synchronization request ASK_SYNC comprises an opening of a bi-directional communication session OPEN_SSRF.

In a non-limiting embodiment, the two-way communication session is radio-frequency. This will allow the ID ID objects to communicate with each other and remotely if necessary. In the remainder of the description, this nonlimiting example of an RF radio-frequency communication session is taken.

This OPEN_SSRF logon is done via a signal, here radio-frequency (RF) MSG_SYNC1 which is sent to the second identifier object ID2, here at time t3.

In order to know which second identifying object ID2 must send the synchronization request, a relative number NS to this second identifying object ID2 is used.

In a first non-limiting example, this NS number is the vehicle number V to which all the identifiers have access. Indeed, such a vehicle number is stored in memory in all the identifiers objects that allow access to said vehicle V. So in the example taken, the first and second identifiers ID1 and ID2 have this number in memory.

In a second nonlimiting example, this number NS is a number specific to the second identifying object ID2, which will also be stored in memory in the first identifying object ID1.

Thus, an ASK_SYNC synchronization request and therefore an opening of an OPEN_SSRF communication session is done after a control of the vehicle number. In a second substep 32), the first identifying object ID1 verifies that an acknowledgment ACK has been returned by the second identifying object ID2. This makes it possible to check whether the second identifier object ID2 is available (that is to say awake and in synchronization mode).

As can be seen in the example of FIG. 2, no acknowledgment ACK receipt has been sent by the second identifier ID2. The check that takes place here at time t4 is therefore negative.

It will be noted that the case where an acknowledgment ACK is received by the first identifier ID1 corresponds to the case explained in the context of the second identifier ID2. It is therefore necessary to refer to the description for the second identifier ID2 below in the fourth step.

In a third substep 33), since it has received no acknowledgment ACK, the first identifier ID1 waits for a radio frequency communication signal for a determined period of time TIMEOUT0. In a non-limiting example, this time is set at 5 seconds. As can be seen in FIG. 2, it receives a message MSG_ASK2 from the second identifier ID2, at time t6, corresponding to an RF communication signal that requires synchronization.

At this moment, in a fourth substep 34), at time t7, the first identifier ID1 sends an acknowledgment ACK via a message MSG_ACK1 to the second identifier I D2 to read that it is available to make a synchronizer. isation.

Thus, the reception of acknowledgment ACK means that a two-way radio-frequency communication session is initialized for the first identifying object I D1 and the second identifying object I D2. Note that in the case where the verification performed in the third substep 33 is negative, after the determined time interval TIMEOUTO, sends a message MSG_FAIL meaning that the synchronization request has failed, and we return to the state of idle standby. This message enables a user of the first identifier object ID1 to know that the second identifier ID2 is not available.

The two-way radio-frequency communication session SSRF will then allow an exchange of information between the two identifiers objects ID1 and ID2 in the form of radio-frequency signals.

RF.

It is recalled that a radio-frequency RF signal is around 433 MHz. Up to GigaHz can be used for the RF signal based on the frequency bands available for different countries (315 MHz for Asia, 868 MHz for some European countries or 915 MHz in America, etc.).

Of course we could use other frequencies for radio-frequency signals for remote communication. The RF signals are greater than 1 MHz unlike low frequency signals BF.

Thus, the two identifiers ID1 and ID2 will be able to communicate if they are several hundred meters apart, generally between 100 and 600 meters with a typical value of 200 meters for 868 MHz for example.

For example, if the first identifying object ID1 is in the vicinity of the vehicle V and if the second identifying object ID2 is in the habitat of the user of the vehicle V, they will be able to communicate.

As regards the second identifier object ID2, when it receives an ASK_SYNC synchronization request from the first identifier object ID1 at time t3, nothing happens because it is not available. The synchronization mode has not yet been selected at home in the example taken in FIG. 2.

It is only at time t4 that the synchronization mode is selected MOD_SYNC at the second identifier ID2. At time t6, the second identifier ID2 sends an ASK_SYNC synchronization request via a message MSG_ASK2 to the first identifier ID 1, this request ASK_SYNC including a bi-directional communication session opening OPEN_SSRF. At time t7, the second identifier ID2 receives an acknowledgment ACK via a message MSG_ACK1 from the first identifier ID1 meaning that the latter is available for synchronization.

In a non-limiting embodiment, a data frame (not shown) is therefore used for:

the opening of an RF communication session OPEN_SSRF, and

- sending an acknowledgment ACK.

In a non-limiting embodiment, this frame comprises a synchronization bit SYNC making it possible to know that a synchronization request is requested. This bit is therefore activated for a synchronization request ASK_SYNC when opening the communication session OPEN_SSRF. In addition, in a non-limiting embodiment, in this frame, a date DT associated with PQ information included in the identifier object is sent at the opening of the communication session OPEN_SSRF. As will be seen below, this date DT corresponds to information updated after access to the vehicle V by an identifying object ID.

As can be seen in the example illustrated in FIG. 2, a date DT1 associated with information in the first identifier object ID1 is sent to the second identifier ID2 during the synchronization request ASK_SYNC (and thus opening the session OMEN_SSRF) by the first identifying object ID1, while a date DT2 associated with information in the second identifying object ID2 is sent to the first identifying object ID1 during the synchronization request ASK_SYNC (and thus opening the session OMEN_SSRF) by the second identifier ID2.

In a fourth step 4), information is transmitted between the two identifying objects ID1 and ID2.

The information transmitted is in a non-limiting example of the information relating to the vehicle. They concern for example:

- the state of the vehicle V,

- the position of the vehicle V

With regard to the state of the vehicle V, the following data can in particular be obtained:

- engine temperature, and / or electronic circuits;

- battery level, fuel level, oil level; - tire pressure;

- state of pre-ventilation or vehicle pre-heating

- rear and front doors closed / open, safe closed / open;

- total mileage and daily mileage;

- etc.

As regards the position of the vehicle V, the following data can in particular be obtained:

- The GPS (Global Positioning System) of the vehicle when it is stopped for example; and - one or more destination addresses Of course, other information can be transmitted related or not to the vehicle such as for example a graphical environment of an identifying object ID.

As will be seen in detail below, the information described above, in the non-limiting example, is vehicle information that is updated after access to said vehicle V by an identifying object ID. The information to be transmitted will be those corresponding to the last vehicle access so that each identifying object includes the same information and the most recent. When updating the information, an update date is saved in the identifier object. This date associated with the updating of the information will make it possible to determine what is the information corresponding to the last vehicle access. The transmission of information will thus be based on this date and be determined in particular according to a comparison of dates respectively associated with vehicle information included in the first identifying object and vehicle information included in the second identifying object.

In a first nonlimiting embodiment, a date comparison is made in a single identifier object, and the information whose date is the most recent will be transmitted to the identifying object containing the oldest information so that they are updated.

In a second nonlimiting embodiment, the information will be transmitted on both sides, and a comparison of dates will be performed in each identifying object which according to the result will update or not its information with that received from the other object ID.

As a result, good synchronization of information between identifiers will be achieved. Thus, in a first non-limiting embodiment, the transmission is performed in the following manner and is described in detail in FIGS. 3 and 4.

In this first mode, only the information included in a single identifier object is transmitted and a single date comparison is performed in a single identifier object.

In this first mode, the first identifying object ID1 will behave as master and the second identifying object ID2 will behave as a slave. That is, it is the first identifying object ID1 that will take the initiatives of the actions while the second identifying object ID2 will wait for instructions from the first identifying object ID1.

After opening a communication session in an identifier object ID,

- At time t8, the second identifying object ID2 is positioned in reception mode OPEN_RX, because it is slave. It waits for the instructions of the first identifying object ID1.

At time t9, with regard to the first identifying object ID 1, after receiving the date DT2 relating to the vehicle information contained in the second identifying object ID2 (received during the opening of the communication session), the first identifier object ID1 performs a comparison of dates.

It looks at whether the date DT2 of the information contained in the second identifier ID2 is earlier than the date DT1 of its own information. Of course, the comparison can also begin at time t8.

In a first step, one places oneself in the case where the first date DT1 is later than the second date DT2. At time t10, if its date DT1 is later than the date DT2, then the first identifying object ID1 is positioned in transmission mode OPEN_TX, and

At time t1 1, it transmits this information PQ1 by means of an RF signal MSG_PQ1 to the second identifying object ID2.

- Then, at time t12, the first identifying object ID1 closes its position in transmission mode CLOSE_TX and is positioned in receiving mode OPEN_RX, while the second identifying object ID2 verifies that it has received PQ1 information of the first identifying object ID1 (step RX_PQ shown in Fig. 3). The PQ information reception is polled during a determined third period TIMEOUT2. If this period is exceeded, a failure message MSG_FAIL is displayed. This TIMEOUT2 period is in a nonlimiting example taken equal to 1 seconds.

If so, if the information PQ1 has been received, at time t13, the second identifying object ID2 closes its reception mode

CLOSE_RX and is in transmission mode OPEN_TX.

At time t14, the second identifying object ID2 checks the integrity of the information it has received (step CHECK_PQ illustrated in Fig. 3). It uses for example a known verification algorithm such as a checksum or any other algorithm known to those skilled in the art.

At time t15, the second identifying object ID2 sends a control signal FLC (called in English "Flow Control") via an RF signal MSG_FLC (step TX_FLC illustrated in Fig. 3) if the information received is correct (the check is positive). In another variant, the control signal FLC is always returned and its value (for example at 0 or 1) determines the result of the integrity check.

At time t16, the first identifying object ID1 scans a reception of an FLC control signal. Of course, he can start scanning at time t13.

According to the first variant (control signal sent only when the information is correct), this scanning takes place for a second determined period of time TIMEOUT1. In a non-limiting embodiment, the second determined period TIMEOUT1 for the polling is defined so that it is greater than the time taken by the second identifying object ID2 to: - check the received information CHECK_PQ;

- return the FLC control signal; and

- update the received information UPDAT_PQ.

This period TIMEOUT1 is in a nonlimiting example taken equal to 1 seconds.

- At time t17, at the end of this period TIMEOUT1, if no FLC control signal has been received or if its value is negative (the information is not correct), a message MSG_FAIL is displayed on the screen of the first identifier object ID1 indicating a failure of the synchronization of information between the two identifiers objects.

On the other hand, if the first identifying object ID1 receives a control signal FLC during this period TIMEOUT1, it knows that the transmitted information has been correctly transmitted and synchronized according to the first variant, or else, according to the second variant, it checks the value of the FLC control signal to see if the information has been correctly transmitted and synchronized. At time t17, if the information has been correctly transmitted, the first identifying object ID1 closes its transmission mode CLOSE_TX. Otherwise, it retries to send its PQ1 information a specified number of times. For example, it retries twice to return the information.

If the information return fails after two tests for example, then at time t18, a message MSG_FAIL is displayed on the screen of the first identifying object ID1 indicating a failure of the synchronization of information between the two identifiers objects.

For its part, if the information transmitted by the first identifying object ID1 is correct, at time t17, the second identifying object ID2 updates its information by replacing it with those transmitted by the first identifying object ID1 (step UPDAT_PQ illustrated in FIG. Fig. 3).

At time t18, the first and second identifiers ID1 and ID2 display on their respective screen a message of success.

MSG_OK indicating that information synchronization was successful.

We have just seen the case where the first date DT1 is later than the second date DT2.

We will see below the case where the first date is earlier than the second date DT2 (points A and B in Fig. 3). This case is illustrated in FIG. 4.

At time t10, the first identifying object ID1 makes a request for transmission of information to the second identifying object ID2 (step ASK_TX_PQ illustrated in Fig. 4) via an RF signal MSG ASK TX PQ. - Then, at time t1 1, the first identifying object ID1 is positioned in reception mode OPEN_RX.

At time t12, the second identifying object ID2 is already in reception mode OPEN_RX (see time t8 described above in Fig. 3). He checks if he has received information. He has not received one, but he sees that he receives a request for transmission of information from the first identifying object ID1.

- Following this, at time t13, the second identifying object ID2 closes its reception mode CLOSE_RX position and is positioned in OPEN_TX transmission mode.

Then, at time t14, the second identifying object ID2 sends its vehicle information PQ2 via an RF signal MSG_PQ2 to the first identifying object ID1 (step TX_PQ).

At time t15, after receiving information coming from the second identifying object ID2, the first identifying object ID1 closes its reception mode position CLOSE_RX and is positioned in transmission mode OPEN_TX.

- Then, at time t16, it checks the integrity of the information (as previously described in Fig. 3 for the second identifying object

ID2) (step CHECK_PQ).

At time t17, if the information PQ2 is correct, the first identifying object ID1 sends a control signal FLC to the second identifying object ID2 via an RF signal MSG_FLC (step TX_FLC), otherwise, a message MSG_FAIL is displayed on its screen indicating a failure of the synchronization. The second variant described above can also be used (always returning an FLC control signal and different value according to a correct transmission or not).

At time t18, the second identifying object ID2 scans and verifies whether it has received the control signal FLC. The scanning and verification is performed according to the first or second variant described above.

- If yes (if it received a control signal or according to the value of the signal received), at the time t19, it closes its mode of transmission CLOSE_TX. In the case of the second variant, it is recalled that it verifies the value of the FLC control signal beforehand. At time t19, with regard to the first identifying object ID 1, it updates its information with that received from the second identifying object ID2 (step UPDAT_PQ).

- If not, at time t19, the second identifying object ID2 retries returning the information PQ2, in the example taken, the return attempt is set to two attempts.

If the transmission still fails, at time t20, the second identifying object ID2 displays a message MSG_FAIL on its screen indicating the failure of the synchronization of information between the two identifying objects.

On the other hand, if the transmission of the information of the second identifying object ID2 to the first identifying object ID1 has been successful, at time t20, a success message MSG_OK is displayed on the screen of the first identifying object ID1 and the second identifier ID2 indicating that synchronization of information was successful. Thus, thanks to this first mode of real isation, the two identifiers ID1 and I D2 objects have updated and synchronized information, ie they have the same information corresponding to the last vehicle access. A single comparison of dates DT1 and DT2 is performed, and it is done in the first identifying object ID 1, which has the synchronization mode MOD_SYNC activated first.

In a second non-imitative embodiment, transm ission is performed in the following manner and is described in detail in FIGS. 5 and 6.

In this second mode, the information included in the two identifiers objects are transmitted, and a comparison of dates is performed in each of the identifiers objects.

After opening a communication session in an ID object ID,

At time t9, the first identifying object ID1 is positioned in transmitting mode OPEN_TX while the second identifying object I D2 is in the receiving mode OPEN_RX.

At time t1 0, the first identifying object I D1 transmits its vehicle information PQ1 via an RF signal MSG_PQ1 to the second identifying object I D2.

At time t1 1, the first identifying object I D1 closes its position in transmitting mode CLOSE_TX and is positioned in receive mode OPEN_RX, while the second identifying object I D2 verifies that it has received information PQ1 of the first. identifying object ID1 (step RX_PQ shown in Fig. 5). PQ information reception is polled for a third time. determined period TIMEOUT2. If this period is exceeded, the failure message MSG_FAIL is displayed on the screen of the second identifier object ID2.

If so, if the information PQ1 has been received, at the time t12, the second identifying object ID2 closes its reception mode CLOSE_RX and is positioned in transmission mode OPEN_TX. If not, a message MSG_FAIL is displayed on its screen indicating a failure to synchronize the information. The reception of information PQ1 is polled during a determined third period TIMEOUT2. If this period is exceeded, the MSG_FAIL failure message is displayed.

At time t13, the second identifying object ID2 checks the integrity of the information it has received (step CHECK_PQ illustrated in Fig. 5).

- Then, at time t14, the second identifying object ID2 returns an FLC control signal according to the first variant or second variant described above via an RF signal MSG_FLC (step TX_FLC illustrated in Fig. 5).

At time t15, the first identifying object ID1, meanwhile, scans a reception of an FLC control signal. According to the first variant, this scanning takes place during a second determined period of time TIMEOUT1. Of course this scan can start at time t12, just after positioning OPEN_RX reception mode. At the end of this second period TIMEOUT1, if no control signal has been received, a message MSG_FAIL is displayed on the screen of the first identifying object ID1 indicating a failure of the synchronization of information between the two identifying objects. If the first identifying object ID1 receives an FLC control signal during this second period TIMEOUT1, it knows that the transmitted information has been correctly transmitted according to the first variant, or else, according to the second variant, it checks the value of the control signal FLC. to see if the information has been correctly transmitted.

At time t16, if the information has not been correctly transmitted, the first identifying object ID1 retries to send its information PQ1 a specified number of times. For example, it retries twice to return the information.

At time t17, if the return of information fails after two tests for example, then a message MSG_FAIL is displayed on the screen of the first identifying object ID1 indicating a failure of the synchronization of information between the two identifying objects.

The remainder of this second embodiment is illustrated in FIG. 6.

If the information transmitted PQ1 by the first identifying object ID1 is correct (a control signal has been sent at time t14 by the second identifying object ID2), at time t16, the second identifying object ID2 in turn transmits its vehicle information PQ2 to the first identifying object ID1 via an RF signal MSG_PQ2.

At time t17, the second identifying object ID2 closes its mode of transmission CLOSE_TX and is positioned in reception mode OPEN_RX.

At time t17 to t20, the first identifying object ID1 performs the same steps described for receiving information from of the second identifier object ID2 previously in FIG. 5, namely:

the scanning of the reception of information (step RX_PQ),

the positioning in transmission mode (step CLOSE_RX / OPEN_TX),

- verification of information integrity (CHECK_PQ), and

sending an FLC control signal (step TX_FLC) according to the previous verification.

At time t21, the first identifying object ID1 compares the two dates DT1 and DT2, namely respectively that corresponding to its information PQ1 and that corresponding to the information PQ2 of the second identifying object ID2.

At time t22, if its date DT1 is later than the received date DT2, a success message MSG_OK is displayed on its screen indicating that the synchronization is done.

On the other hand, at time t22, if its date DT1 is earlier, an update of its own vehicle information with those received from the second identifier object ID2 is carried out (step UPDAT_PQ illustrated in Fig. 6), and

At time t23, a success message MSG_OK is displayed on its screen indicating that the synchronization is successful.

At time t21, for its part, the second identifying object ID2 checks whether it has received a control signal (RX_FLC), and

At time t22, if the second determined period TIMEOUT1 is exceeded, retry a transmission (failure of a first transmission), or At time t23, if the transmission has failed, it displays a failure message MSG_FAI L on its screen indicating the failure of the synchronization of information between the two identifying objects.

On the other hand, at time t22, in the case where the second identifying object I D2 has received a control signal FLC (first variant) or when its value is correct (second variant), the second identifying object I D2 compares the two dates DT2 and DT1, namely respectively that corresponding to its information PQ2 and that corresponding to the information PQ1 of the first identifying object ID1.

At time t23, if its date DT1 is later than the date received DT2, a success message MSG_OK is displayed on its screen indicating that the synchronization is done.

On the other hand, if its date DT1 is earlier, at time t23, an updating of its own vehicle information with those received from the first identifying object I D1 is carried out (step U PDAT_PQ illustrated in FIG. 6), and

At time t24, a success message MSG_OK is displayed on its screen indicating that the synchronization is successful.

Thus, thanks to this second mode of real isation, the two identifiers ID1 and I D2 objects have updated and synchronized information, that is to say that they have the same information corresponding to the last access veh icule. Two date comparisons DT1 and DT2 are performed, each respectively in the first identifying object I D1 and the second identifying object I D2.

It will be noted that in a first variant of these two embodiments presented, the set of PQ information included in an ID identifying object are transmitted at one time in a single packet.

In a second variant, the PQ information is transmitted in several packets. This allows a more modular information transmission. That is, information of the same type can be grouped together. For example, the vehicle status information can be grouped together in a first package, while the vehicle position information can be grouped into another package. For this second variant, at each packet transmission PQi (i = 1 to N, N integer), there is an integrity check of this packet and an associated control signal FLC (transmitted or not according to the first or second variant previously described). This second variant is represented in FIG. 7, in the case of the first embodiment shown in FIG. 3, but applies in the same way to FIG. 4 and the second embodiment shown in FIGS. 5 and 6.

It will be recalled that in the example taken for these two embodiments, the "vehicle access" dates DT1 and DT2 are sent during an opening of an RF communication session.

OPEN_SSRF. This saves execution time and has one less step to complete.

Of course, other variant embodiments may be used, such as in non-limiting examples:

- The transmission of dates DT1 and DT2 just after the opening of an OPEN_SSRF communication session (in the first embodiment, only the second date DT2 needs to be transmitted), or, - A DT date is included in the PQ information to be transmitted and is thus transmitted at the same time as the information, or else

- Each packet PQi has the date DT. In a fifth step 5), after transmitting PQ information (or a repetitive failure of transm ission), the two identifiers ID1 and ID2 objects close their communication session.

CLOSE_SSRF as shown in FIG. 1 and return to idle standby state.

The method of the invention is implemented by a device DISP for transmitting information PQ of a first identifying object I D1 for automotive vehicle V to a second identifying object I D2, represented in FIG. 7.

This DISP device comprises in particular:

- a UC control unit:

- to activate a MOD_SYNC synchronization mode (through an HMI man-machine interface); - make a synchronization request including an opening of a bidirectional communication session SSRF; and

transmitting PQ information from an identifying object to another identifying object I D2 as a function of a date DT associated with the PQ information to be transmitted.

For this purpose, a control unit UC controls an ER transceiver for a physical transmission (TX_PQ) of the PQ information. In a nonlimiting embodiment, the device DISP may further comprise this transceiver ER.

In a non-imitative embodiment, this transceiver ER is a radio-frequency transceiver.

The UC control unit also makes it possible to perform all the other steps and substeps described above, namely in particular those of: triggering the awakening of an identifying object I D1, I D2; - close a communication session CLOSE_SSRF;

update information in an identifier object from information received by another identifier object UPDAT_PQ;

- perform a COMP_DAT date comparison using a comparator; and

- check the integrity of the information received CHECK_PQ.

The UC control unit also allows:

- save PQ vehicle information with a DT date corresponding to the last vehicle access. This date can be based on the vehicle clock for example;

positioning an identifier object ID in transmission mode TX or reception RX, that is to say, to control the transceiver ER in transmission or reception; and - activate the ER transceiver.

One can of course provide a second control unit for performing the activation of the transceiver ER or other features in place of the first control unit if necessary.

The transceiver ER also physically receives (RX_PQ) information from another object RX_PQ identifier by means of an RF signal.

It will be noted that such a device DISP is in a non-limiting embodiment included in an identifying object ID. Thus, each identifying object ID1 and ID2 includes such a device DISP. In addition, as illustrated in FIG. 7, each identifying object comprises a human-machine interface HMI comprising in particular:

an SCR screen on which the MSG_FAIL or MSG_OK success messages for the synchronization of information between identifying objects can be displayed;

a MENU menu, for example tactile, allowing: - to wake up the object identifying ID (by means for example of a button B_UP), or of

- select the synchronization mode (using for example a B_MOD_SYNC button).

It should be noted that the implementation of the transmission method described above can be carried out by means of a microprogrammed device, or even a wired logic. Thus, the transmission device DISP may comprise a computer program product PG comprising one or more instruction sequences executable by an information processing unit such as a microprocessor, or a processing unit of a microcontroller , an ASIC, a computer, etc., the execution of said instruction sequences allowing implementation of the method described.

Such a PG computer program can be written in non-volatile memory writable type ROM or non-volatile rewritable memory type FLASH for example. Said PG computer program can be registered in the factory memory or loaded into memory or remotely downloaded into memory. The instruction sequences can be sequences of machine instructions, or sequences of a control language interpreted by the processing unit at the time of their execution. In the non-limiting example of FIG. 7, the computer program PG is written in a memory of the transmission device DISP. In another example (not shown), the computer program PG may also include one or more sequences of instructions for implementing the clocking and selecting functions of the synchronization mode of the human-machine interface HMI of the object ID.

Of course, the invention has been described for two identifiers, but it can be extended to more than two identifiers. Thus, the invention has the following advantages in particular:

- It allows to have a simple synchronization to implement since triggered manually including;

- It allows a user of the vehicle to be able to use all the identifying objects relating to his vehicle regardless of whether the vehicle information in each of the identifiers objects are identical and one level of updates thanks to this possibility synchronization of information between object identifiers; - It allows remote synchronization between identifying objects through this two-way communication between the identifiers objects;

- It allows an identifying object to include vehicle information that is temporary and may change with each use of the vehicle;

- It makes it possible to obtain a synchronization of information between identifying object that consumes little energy since it is triggered manually; and

- It allows the user of the vehicle to be able to consult the vehicle information directly on the identification object (on its screen) without having to be near a low-frequency antenna of the vehicle or go to a manufacturer or dealer. He can do it anytime, especially away from the vehicle.

Claims

1. A method for transmitting information (PQ) from a first identifying object (I D1) for a motor vehicle (V) to a second identifying object (ID2), an identifying object (ID1, ID2) allowing access to said vehicle ( V), said method comprising the steps of: - activating a synchronization mode (MOD_SYNC);

- open a bi-directional communication session (SSRF); and

transmitting information (PQ) from an identifying object (I D1) to the other identifying object (ID2) according to a date (DT1, DT2) associated with the information (PQ) to be transmitted.

The information transmission method (PQ) of claim 1, wherein the bi-directional communication is radio frequency (RF).

3. Method of transmitting information (PQ) according to one of the preceding claims 1 or 2, wherein an information transmission (PQ) is based on a comparison of dates (DT1, DT2) respectively associated with information ( PQ1) included in the first identifying object (ID 1) and information (PQ2) included in the second identifying object (ID2).

4. A method of transmitting information (PQ) according to one of the preceding claims, wherein a date (DT1, DT2) corresponds to updated information after access to the vehicle (V) by an identifying object (I D1 , ID2).

5. An information transmission method (PQ) according to any one of the preceding claims, wherein the opening of a communication session is done after a control of a number (NS) vehicle.

6. Information transmission method (PQ) according to any one of the preceding revendications, wherein the activation of synchronization mode (MOD_SYNC) is done manually.

7. A method of transmitting information (PQ) according to any one of the preceding claims, wherein an information transmission is done by a plurality of packets (PQ) -

8. An information transmission method (PQ) according to any one of the preceding claims, wherein at least one date (DT1, DT2) is transmitted during an opening of a two-way communication session.

9. Device (DISP) for transmitting information (PQ) from a first identifying object (I D1) for automotive vehicle (V) to a second identifying object (I D2), an identifying object (ID1, I D2) allowing access to the vehicle (V), it it ispositif (DISP) comprising:

- A control unit (UC) for:

- activate a synchronization mode (MOD_SYNC);

- open a bi-directional communication session (SSRF); and - transmitting information (PQ) of an identifying object

(ID1) to the other identifying object (ID2) according to a date (DT1, DT2) associated with the information (PQ) to be transmitted.

1 0. Identifying object (I D1) for automotive vehicle (V) able to transmit information to another identifying object (I D2), an identifying object (I D1) allowing access to the vehicle (V), and comprising:

a man-machine interface (I HM) for selecting a synchronization mode (MOD_SYNC);

a transceiver for physically transmitting information to another identifying object (I D); and an information transmission device (DISP) according to the preceding claim.

1 1. Computer program product (PG) having one or more instruction sequences executable by an information processing unit, executing said instruction sequences for implementing the method according to any one of the claims previous 1 to 8.