Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
  • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
  • G01S5/0269—Inferred or constrained positioning, e.g. employing knowledge of the physical or electromagnetic environment, state of motion or other contextual information to infer or constrain a position
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
  • H04W52/02—Power saving arrangements
  • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
  • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
  • G01S5/0009—Transmission of position information to remote stations
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
  • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
  • G01S5/0284—Relative positioning
  • G01S5/0289—Relative positioning of multiple transceivers, e.g. in ad hoc networks
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
  • H04W64/003—Locating users or terminals or network equipment for network management purposes, e.g. mobility management locating network equipment
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S2205/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
  • G01S2205/01—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations specially adapted for specific applications

Definitions

• the present invention relates to a device for locating secondary nodes of a vehicle. It finds a particular but non-limiting application in motor vehicles.
• a device for locating secondary nodes known to those skilled in the art and described in US patent 10,926,738 B1 comprises a main node and a plurality of secondary nodes, all forming a vehicle network.
• the location device relies on a first subnode and a second different subnode whose positions are known in the vehicle to locate a third subnode.
• These two secondary nodes whose position is known have a physical encoding of a connector to define them as a reference secondary node to determine the position of a third secondary node, said connector being used to connect the secondary nodes on a beam wired vehicle.
• the tracking device comprises a main node which is configured to:
• the trilateralization includes calculations of coordinates in the vehicle orthonormal frame.
• the primary node and secondary nodes are used to subsequently locate a hands-free access identifier around the motor vehicle.
• the main node sends measurement requests to the secondary nodes and receives in return a response which includes a distance measurement between said secondary nodes and said hands-free access identifier. Thanks to the location of the secondary nodes of the vehicle, the main node can distinguish the different messages sent by the different secondary nodes and recover the distance measurement in a message sent by a secondary node while knowing from which secondary node this distance measurement comes . The master node can then correctly perform a geometric reconstruction (such as a triangulation) from all the distance measurements to determine the position of said hands-free access identifier relative to the motor vehicle.
• the hands-free access identifier makes it possible in particular to perform a function called PEPS (“Passive Entry Passive Start”). This PEPS function allows the unlocking of the motor vehicle when the hands-free access identifier approaches the vehicle, and thus allows access to said vehicle, and also authorization to start the motor vehicle.
• PEPS Passive Entry Passive Start
• the present invention aims to propose a device for locating secondary nodes of a vehicle which presents an alternative to the device for locating secondary nodes of the state of the prior art.
• the primary node is configured for:
• said at least one secondary reference node is configured for:
• each secondary node is configured to send its unique network identifier to said main node when said sub-network to which it belongs is powered.
• the localization of the secondary nodes in a vehicle is automatic. It is not necessary to have an external intervention by an external operator.
• said locating device may further include one or more additional characteristics taken alone or in any technically possible combination, from among the following.
• said at least one secondary reference node is located at different distances from the other secondary nodes. In particular, it is located at different distances from the other secondary nodes of the same subnet.
• said main node is configured to identify and locate a single reference secondary node.
• said main node is further configured for:
• said main node is further configured to deactivate the power supply of said sub-network after said location of said node reference secondary.
• said main node is also configured for:
• said main node is configured to identify and locate at least two secondary reference nodes.
• each secondary reference node is located inside the vehicle while the other secondary nodes of said sub-network to which each secondary reference node belongs are located outside, or vice versa .
• said reference secondary node of said sub-network is configured to perform a distance measurement (d) between itself and the other secondary nodes of the sub-network to which it belongs.
• said main node is further configured to deactivate the power supply of said sub-network after the location of the other secondary nodes.
• main node is further configured to:
• each of the two reference secondary nodes is configured to perform a distance measurement between itself and the other secondary nodes of the sub- network to which it belongs.
• said main node is further configured to deactivate the power supply of said sub-network after the location of the other secondary nodes.
• m is equal to or different from one subnet to another subnet.
• the power supplies of the two sub-networks are initially deactivated.
• said location method further comprises a step for all cases n of deactivating the power supply of said first sub-network after said location of the other secondary nodes of said first sub-network, and deactivating supplying said second sub-network after said location of the other secondary nodes of said second sub-network.
• FIG. 1 is a schematic view of a device for locating secondary nodes, said locating device comprising a main node and said secondary nodes, according to a non-limiting embodiment of the invention
• FIG. 2 is a top view of a vehicle comprising the location device of FIG. 1, said location device comprising two secondary nodes each distributed over two sub-networks, according to a first non-limiting embodiment
• FIG. 3 is a top view of a vehicle comprising the location device of FIG. 1, said location device comprising three secondary nodes distributed over two sub-networks, according to a first non-limiting embodiment
• FIG. 4 is a top view of a vehicle comprising the location device of FIG. 1, said location device comprising six secondary nodes distributed over two sub-networks, according to a first non-limiting embodiment
• FIG. 5 is a top view of a vehicle comprising the location device of FIG. 1, said location device comprising seven secondary nodes distributed over two sub-networks, according to a first non-limiting embodiment,
• FIG. 6 is a diagram illustrating a method for locating secondary nodes implemented by the locating device of FIG. 1, according to a non-limiting embodiment
• FIG. 7 is a diagram illustrating the location method of Figure 6 implemented when the vehicle network comprises two secondary nodes, according to a non-limiting embodiment
• FIG. 8 is a diagram illustrating the location method of Figure 6 implemented when the vehicle network comprises three secondary nodes, according to a non-limiting embodiment
• FIG. 9 is a diagram illustrating the location method of FIG. 6 implemented when the vehicle network comprises six secondary nodes, according to a non-limiting embodiment
• FIG. 10 is the continuation of the diagram illustrating the location method of FIG. 9 implemented according to a non-limiting embodiment
• FIG. 11 is a diagram illustrating the location method of FIG. 6 implemented when the vehicle network comprises seven secondary nodes, according to a non-limiting embodiment
• FIG. 12 is the continuation of the diagram illustrating the location method of FIG. 11, according to a non-limiting embodiment.
• the vehicle 2 is a motor vehicle.
• Motor vehicle means any type of motorized vehicle. This embodiment is taken as non-limiting example in the following description. In the remainder of the description, vehicle 2 is thus otherwise called motor vehicle 2.
• the nodes are connected via a wired network 20.
• the wired network 20 is a CAN “Control Area Network” in English), LIN (“Local Interconnect Network” in English), LAN (“Local Interconnect Network”). Area Network”), FLEX-RAY or any other type of wired network.
• the main node 10 (called “Hub” in English) is an electronic control unit.
• the secondary nodes 11 (called “Anchor” in English) are beacons, otherwise called satellites or anchors.
• the nodes 10, 11 of the vehicle network Nv are used to locate a hands-free access identifier (not shown) around the motor vehicle 2.
• the hands-free access identifier allows a PEPS (Passive Entry Passive Start) function to be performed.
• the PEPS function allows unlocking/locking and starting authorization of the motor vehicle 2.
• the main node 10 sends to the secondary nodes 11 distance measurement requests and each secondary node 11 sends return messages including in particular a distance measurement between itself and ("hands-free access identifier.
• the vehicle network Nv comprises two sub-networks Nwl, Nw2 including a first sub-network Nwl and a second sub-network Nw2.
• Each sub-network Nwl, Nw2 is each independently powered by a power supply 21, otherwise called power supply 21.
• the motor vehicle 2 thus comprises two power supplies 21.
• each sub-network Nwl, Nw2 can contain a number of secondary nodes 11 different from the other sub-network Nw2, Nwl.
• Each secondary node 11 has a unique network identifier Id indicating whether it is inside or outside said motor vehicle 2.
• the unique network identifier Id is coded on 8 bits (i.e. one byte). It includes a bit bl indicating whether the secondary node 11 is inside or outside the motor vehicle 2.
• the unique network identifier Id further comprises a code unique identification which makes it possible to differentiate a secondary node 11 from another secondary node 11.
• the main node 10 is configured to know the architecture T of the vehicle network Nv, namely it knows:
• the main node 10 does not know which exact position Pos occupies such and such a secondary node 11 in a sub-network Nw.
• the main node 10 knowing the architecture T of the vehicle network Nv, in the non-limiting example embodiment of FIG. 2, the main node 10 just knows that there is a secondary node 11 in position Pos before center and another secondary node 11 in the center rear Pos position, but he does not know that it is the secondary node 11a which is in the center front Pos position and the secondary node 11b which is in the center rear Pos position.
• the main node 10 will be able to associate a unique network identifier Id with a position Pos for each secondary node 11 so as to be able to discriminate them from each other. He will thus be able to know which secondary node 11 he is addressing to send a distance measurement request, and to distinguish the return messages from the various secondary nodes 11 which pass through the wired network 20 following measurement requests. distance.
• the main node 10 is configured to independently activate and deactivate the power supply 21 of each subnet Nwl, Nw2 (functions illustrated in Figure 1 fl(10, 21, ON, Nw) for activation and f2(10, 21, OFF, Nw) for deactivation).
• the main node 10 is further configured to:
• said at least one secondary reference node 110 is located at different distances d from the other secondary nodes 11.
• said main node 10 is configured to identify and locate a single reference secondary node 110.
• each secondary reference node llo is located inside the vehicle 2 while the other secondary nodes 11 of said sub-network Nw to which each secondary reference node llo belongs are located outside, or vice versa.
• the main node 10 is configured to identify and locate a single secondary reference node llo in said sub-network Nw.
• the main node 10 is configured to identify and locate two secondary reference nodes llo in said sub-network Nw.
• Primary node 10 is further configured to:
• the main node 10 is further configured to:
• said at least one secondary reference node llo is configured to:
• a reference secondary node 110 can thus perform a distance measurement d between itself and the other secondary nodes 11 of the sub-network Nw to which it belongs, or between itself and the other secondary nodes 11 of the other Nw subnet to which it does not belong.
• Each secondary node 11 is configured to send its unique network identifier Id to the main node 10 when said sub-network Nw to which it belongs is powered (function illustrated in FIG. 1 fll(ll, 10, Id)).
• FIGS 2 to 5 are illustrated various non-limiting embodiments of the vehicle network Nv. It will be noted that the connecting lines (in continuous line or in broken line) illustrated between the main node 10 and the various secondary nodes 11 represent the wired electrical power supply networks.
• the two secondary nodes 11 are located inside the motor vehicle 2.
• the first sub-network Nwl is illustrated in solid lines and the second sub-network Nw2 is illustrated in dotted lines.
• the secondary node 11b is part of the first subnet Nwl and the secondary lia is part of the second subnet Nw2,
• the secondary node lia is located at the front center of the motor vehicle 2 and the secondary node 11b is located at the rear center of the motor vehicle 2.
• the main node 10 knows the architecture T of the vehicle network Nv, namely it knows that there is a secondary node 11 positioned at the front center and a secondary node 11 positioned at the rear center. There is only one reference secondary node llo. In the non-limiting example illustrated, the reference secondary node 110 is the secondary node 11b.
• primary node 10 is configured to:
• the secondary node 11b can send its unique network identifier Id to the main node 10 (wire function described previously).
• the main node 10 thus identifies the secondary reference node 110 (function f3 described previously).
• the main node 10 is configured to activate the power supply of said second sub-network Nw2 (function fl described above) to be able to locate the only secondary node 11 in said second sub-network Nw according to the architecture T of the vehicle network Lv.
• the secondary node 11a can send its unique network identifier Id to the main node 10 (wire function described previously). From said unique network identifier Id and according to the architecture T of the vehicle network Nv, the main node 10 locates the secondary node 11a. It associates its unique network identifier Id with its position Pos (function f8' described above). It thus determines that the secondary node lia is the node which is located at the front center of the motor vehicle 2.
• the main node 10 has thus found which secondary node 11 is at the front of the motor vehicle 2 and which secondary node 11 is at the rear. He can now tell them apart.
• the main node 10 is further configured to deactivate the power supply 21 of the second sub-network Nw2 (function f2 described previously). This makes it possible to reduce the electrical consumption of the motor vehicle 2.
• the power supply 21 of the first sub-network Nwl, that of the second sub-network Nw2 are then activated again.
• the first sub-network Nwl is illustrated in solid line and the second sub-network Nw2 is illustrated in dotted lines.
• the secondary node 11b is part of the first subnet Nwl, while the secondary lia and the secondary node 11b are part of the second subnet Nw2,
• the secondary node lia is positioned at the center front and inside the motor vehicle 2,
• the secondary node 11b is positioned at the center right and inside the motor vehicle 2,
• the secondary node 11c is positioned at the center left and inside the motor vehicle 2.
• the reference secondary node 110 is defined such that it is located at different distances d from the other secondary nodes 11.
• the secondary node 11b does not have the same distance d with the node secondary lia and with the secondary node 11c. This will make it possible to distinguish the secondary node 11a from the secondary node 11c.
• primary node 10 is configured to:
• the secondary node 11b can send its unique network identifier Id to the main node 10 (wire function described above).
• the main node 10 thus identifies the secondary reference node 110 (function f3 described previously).
• the main node 10 determines that said secondary node 11b is the reference secondary node llo in the first sub-network Nwl. Indeed, as the main node 10 knows that there is only one secondary reference node llo in the first sub-network Nwl, and that it is located inside, it locates it, namely it associates its unique network identifier Id with its position Pos in the motor vehicle 2 (function f4 described previously). In the non-limiting example, it associates the unique network identifier Id of the secondary node 11b with the center right position Pos.
• the main node 10 is configured to activate the power supply 21 of the second subnet Nw2 (function fl described previously). It will be noted that the main node 10 does not deactivate the power supply 21 of the first sub-network Nwl because it will use the secondary reference node 110, here 11b, of said first sub-network Nwl to measure distances with the secondary nodes 11 of the second subnet Nw2.
• the secondary node 11a and the secondary node 11c can send their unique network identifier Id to the main node 10 (wire function described previously).
• the main node 10 After said reception of the unique network identifiers Id of the secondary nodes 11a and 11c, the main node 10 is configured to:
• the main node 10 can send this command c because it knows the unique network identifier Id of the secondary reference node llo.
• the secondary reference node 110 On receipt of the command c, the secondary reference node 110, here 11b, is configured to perform distance measurements d (function f9 described previously) and send back to the main node 10 two distances d referenced Rba and Rbc on the FIG. 3, which are respectively the distance between itself and the secondary node 11a and the distance between itself and the secondary node 11c (function flO described above).
• the main node 10 On reception of the distances Rba and Rbc (function f6 described above), the main node 10 is configured to compare them with each other (function f7 described above). So he can see that Rba is greater than Rbc.
• the main node 10 can associate the unique network identifiers Id of the secondary node 11a and of the secondary node 11c with positions Pos in the vehicle network Nv. He knows in fact that in the second sub-network Nw2, there is a secondary node 11 which is at the front center and which is further from the reference secondary node 10 which is at the center right, and another which is is in the center left which is closer to the secondary reference node ll0 which is in the center right. It thus locates said secondary nodes 11a and 11c of the second sub-network Nw2 (function f7 described previously).
• the main node 10 determines that the secondary node 11a is the node which is located at the front center of the motor vehicle 2 and that the secondary node 11c is the node which is located at the center left. [94] When it has finished locating all of the secondary nodes 11 of the vehicle network Nv, in one non-limiting embodiment, the main node 10 is further configured to deactivate the power supply 21 of the first subnet Nwl and to deactivate the power supply 21 of the second subnet Nw2 (function f2 described above).
• the first sub-network Nwl is illustrated in solid line and the second sub-network Nw2 is illustrated in dotted lines.
• the six secondary nodes 11 are referenced lia, 11b, 11c, lld, lie and llf,
• the secondary node lia is positioned at the center front and inside the motor vehicle 2,
• the secondary node 11b is positioned at the center rear and inside the motor vehicle 2,
• the secondary node 11c is positioned at the front right and outside the motor vehicle 2,
• the secondary node lld is positioned at the right rear and outside of the motor vehicle 2,
• the secondary node binds is positioned at the left rear and outside of the motor vehicle 2,
• the secondary node llf is positioned at the front left and outside of the motor vehicle 2.
• the secondary reference node lloi is located in the first subnet Nwl is the secondary node 11b, and the secondary reference node II02 is located in the second subnet Nw2 and the secondary node lia.
• a secondary reference node llo is located inside the motor vehicle 2 unlike the other secondary nodes 11 of the same subnet Nw which are located outside, or vice versa: a secondary reference node llo, is located outside the motor vehicle 2 unlike the other secondary nodes 11 of the same subnet Nw which are located inside.
• the main node 10 knows via the architecture T of the vehicle network Nv that it there is a secondary node 11 inside a sub-network Nw which is the reference secondary node 110 and two other secondary nodes 11 outside said sub-network Nw.
• the secondary reference node lloi is defined such that it is located at different distances d from the other secondary nodes 11 of the first sub-network Nwl.
• the secondary node 11b does not have the same distance d with the secondary node binds as with the secondary node llf. This will make it possible to distinguish the secondary node lie from the secondary node llf.
• the secondary reference node II02 is defined such that it is located at different distances d from the other secondary nodes 11 of the second sub-network Nw2.
• the secondary node lia does not have the same distance d with the secondary node 11c as with the secondary node lld. This will make it possible to distinguish the secondary node 11c from the secondary node lld.
• the main node 10 operates on the same principle as for the second non-limiting embodiment and thus uses the same functions.
• the description made for the third non-limiting embodiment applies for each sub-network Nwl, Nw2, with the difference that the distances d measured between a secondary reference node llo are the distances d measured between itself and the other secondary nodes 11 of the sub-network Nw to which it belongs and not the other secondary nodes 11 of the other sub-network Nw.
• primary node 10 is configured to:
• the secondary node 11b which is the reference secondary node lloi can send its unique network identifier Id to the main node 10 (wire function described previously) as well as the other secondary nodes 11 of the first Nwl subnet.
• the main node 10 thus identifies the secondary reference node lloi (function f3 described previously).
• the main node 10 determines that said secondary node 11b is the reference secondary node lloi in the first sub-network Nwl. Indeed, as the main node 10 knows that there is only one secondary reference node llo in the first sub-network Nwl, and that it is located inside the motor vehicle 2 unlike the others secondary nodes 11 of the first subnet Nwl, which are located outside; the main node 10 therefore locates it, namely it associates its unique network identifier Id with a position Pos in the motor vehicle 2 (function f4 described previously), here rear center.
• the main node 10 is configured to:
• the main node 10 can send this command c because it knows the unique network identifier Id of the secondary reference node lloi.
• the secondary reference node lloi Upon receipt of the command c, the secondary reference node lloi, here 11b, is configured to perform distance measurements d (function f9 described previously) between itself and the other secondary nodes 11 of the first sub-network Nwl, here bind and llf, and return to the main node 10 two distances d referenced Rbe and Rbf, which are respectively the distance between itself and the secondary node bind and the distance between itself and the secondary node llf (function flO described previously).
• the main node 10 On reception of the distances Rbe and Rbf (function f6 described above), the main node 10 is configured to compare them with each other (function f7 described above). So he can see that Rbf is greater than Rbe.
• the main node 10 can associate the unique network identifiers Id of the secondary node binds and of the secondary node llf with positions Pos in the vehicle network Nv. He knows in fact that in the first sub-network Nwl, there is a secondary node 11 which is located at the front left and which is further from the reference secondary node lloi which is located at the rear center, and another which is at the rear left which is closer to the subnode of reference lloi which is at the rear center. It thus locates said secondary nodes bind and llf of the first sub-network Nwl (function f7 described above). As Rbf>Rbe, the main node 10 thus determines that the secondary node lie is the node which is at the left rear of the motor vehicle 2 and that the secondary node llf is the node which is at the front left.
• the main node 10 is configured to deactivate the power supply 21 of the first subnet Nwl (function f2 described above).
• the deactivation of the power supply 21 of the first subnet Nwl makes it possible to reduce the electrical consumption of the motor vehicle 2. It will be noted that the step of deactivating the power supply 21 of the first sub-network Nwl is optional.
• the main node 10 is configured to activate the power supply 21 of the second sub-network Nw2 (fl function described previously) which makes it possible to consider the secondary nodes 11 of the second sub-network Nw2.
• the secondary node IIa which is the reference secondary node II02 can send its unique network identifier Id to the main node 10 (wire function described above) as well as the other secondary nodes 11 of the second subnet Nw2.
• the main node 10 thus identifies the secondary reference node II02. (function f3 described previously).
• the main node 10 determines that said secondary node 11a is the reference secondary node II02 in the second sub-network Nw2. Indeed, as the main node 10 knows that there is only one secondary reference node llo in the second sub-network Nw2, and that it is located inside the motor vehicle 2 unlike the other secondary nodes 11 of the second sub-network Nw2, which are located outside, the main node 10 locates it, namely it associates its unique network identifier Id with its position Pos in the motor vehicle 2 (function f4 previously described ). It thus determines that the secondary node lia is the node which is located at the front center of the motor vehicle 2.
• the main node 10 is configured to:
• the main node 10 can send this command c because it knows the unique network identifier Id of the secondary reference node II02.
• the secondary reference node II02 Upon receipt of the command c, the secondary reference node II02, here lia, is configured to perform distance measurements d (function f9 described previously) between itself and the other secondary nodes 11 of the second sub-network Nw2, here 11c and lld, and send back to the main node 10 two distances d referenced Rac and Rad, which are respectively the distance between itself and the secondary node 11c and the distance between itself and the secondary node lld (function flO described previously).
• the main node 10 On reception of the distances Rac and Rad (function f6 described above), the main node 10 is configured to compare them with each other (function f7 described above). So he can see that Rad is superior to Rac.
• the main node 10 can associate the unique network identifiers Id of the secondary node 11c and of the secondary node lld with positions Pos in the vehicle network Nv. He knows in fact that in the second sub-network Nw2, there is a secondary node 11 which is at the front right and which is closer to the reference secondary node II02 which is at the front center, and another which is at the rear right which is farther from the secondary reference node II02 which is located at the front center. It thus locates said secondary nodes 11c and 11d of the second sub-network Nw2 (function f7 described above). As Rad > Rac, the main node 10 thus determines that the secondary node 11c is the node which is at the front right of the motor vehicle 2 and that the secondary node 11d is the node which is at the rear right.
• the main node 10 is further configured to deactivate the power supply 21 of the first subnet Nwl and to deactivate the power supply 21 of the second subnet Nw2 (function f2 described above).
• the first sub-network Nwl is illustrated in solid line and the second sub-network Nw2 is illustrated in dotted lines.
• the seven secondary nodes 11 are referenced lia, 11b, 11c, lld, lie, llf and 11g,
• the secondary nodes lia, lld and 11g are part of the first subnet Nwl and the secondary nodes 11b, 11c, lie, and llf are part of the second subnet Nw2,
• the secondary node lia is positioned at the center front and inside the motor vehicle 2,
• the secondary node 11b is positioned at the center right and inside the motor vehicle 2,
• the secondary node 11c is positioned at the center left and inside the motor vehicle 2,
• the secondary node lld is positioned at the right rear and outside of the motor vehicle 2,
• the secondary node binds is positioned at the left rear and outside of the motor vehicle 2,
• the secondary node llf is positioned at the left front and outside the motor vehicle 2,
• the secondary node 11g is positioned at the front right and outside of the motor vehicle 2.
• the reference secondary node lloi in the first sub-network Nwl is the secondary node lia
• the reference secondary node II02 in the second sub-network Nw2 is the secondary node llb
• the reference secondary node II03 in the second sub-network Nw2 is the secondary node llc.
• the secondary reference node lloi is defined such that it is located at distances d different from the other secondary nodes 11 of the first sub-network Nwl.
• the secondary node lia does not have the same distance d with the secondary node lld as with the secondary node 11g. This will allow secondary node lld to be distinguished from secondary node 11g.
• the same way :
• the secondary reference node II02 is defined such that it is located at different distances d from the other secondary nodes 11 of the second sub-network Nw2.
• the secondary node 11b does not have the same distance d with the secondary node binds as with the secondary node llf as with the other reference secondary node 11c, and
• the secondary reference node II03 is defined so that it is located at distances d different from the other secondary nodes 11 of the second subnet Nw2.
• the secondary node 11c does not have the same distance d with the secondary node binds as with the secondary node llf and with the other reference secondary node 11b.
• the reference secondary node llo when there is a single reference secondary node llo in a sub-network Nw, here in the first sub-network Nwl, it will be noted that the reference secondary node llo, is located inside of the motor vehicle 2 unlike the other secondary nodes 11 of the same sub-network Nw which are located outside, or vice versa: the reference secondary node 110 is located outside the motor vehicle 2 unlike the other secondary nodes 11 of the same Nw subnet that are located inside. Thus, the secondary node 11a is located inside while the secondary nodes 11c and lld are located outside. Thus, the main node 10 knows via the architecture T of the vehicle network Nv that there is a secondary node 11 inside the first sub-network Nw which is the reference secondary node 110 and two other secondary nodes 11 at the outside said first subnet Nwl.
• a secondary reference node llo is located inside of the motor vehicle 2 unlike the other secondary nodes 11 of the same sub-network Nw which are located outside, or vice versa: a reference secondary node 110 is located outside the motor vehicle 2 unlike the other secondary nodes 11 of the same Nw subnet that are located inside.
• the secondary node 11b and the secondary node 11c are located inside while the secondary nodes bind and llf are located outside.
• the main node 10 knows via the architecture T of the vehicle network Nv that there are two reference secondary nodes 10 inside the second sub-network Nw2 and two other secondary nodes 11 outside of said second sub-network. Nw2 network.
• main node 10 is configured to:
• the secondary node lia which is the reference secondary node lloi can send its unique network identifier Id to the main node 10 (wire function described previously) as well as the other secondary nodes 11 of the first subnet Nwl.
• the main node 10 thus identifies the secondary reference node lloi (function f3 described previously).
• the main node 10 determines that said secondary node lia is the reference secondary node lloi in the first subnetwork Nwl. Indeed, as the main node 10 knows that there is only one secondary reference node llo in the first sub-network Nwl, and that it is located inside the motor vehicle 2 unlike the others secondary nodes 11 of the first subnet Nwl, which are located outside; the main node 10 therefore locates it, namely it associates its unique network identifier Id with a position Pos in the motor vehicle 2 (function f4 described above), here before center.
• the main node 10 is configured to:
• the main node 10 can send this command c because it knows the unique network identifier Id of the secondary reference node lloi.
• the secondary reference node lloi Upon receipt of the command c, the secondary reference node lloi, here lia, is configured to perform distance measurements d (function f9 described previously) between itself and the other secondary nodes 11 of the first subnet Nwl, here lld and 11g, and return to the main node 10 two distances d referenced Rad and Rag, which are respectively the distance between itself and the secondary node lld and the distance between itself and the secondary node 11g (function flO described previously).
• the main node 10 On reception of the Rad and Rag distances (function f6 described above), the main node 10 is configured to compare them with each other (function f7 described above). So he can see that Rad is superior to Rag.
• the main node 10 can associate the unique network identifiers Id of the secondary node lld and of the secondary node 11g with positions Pos in the vehicle network Nv. He knows in fact that in the first sub-network Nwl, there is a secondary node 11 which is at the front right and which is closer to the reference secondary node lloi which is at the front center, and another which is at the rear right which is farther from the secondary reference node lloi which is located at the front center. It thus locates said secondary nodes lld and 11g of the first subnet Nwl (function f7 described previously). Like Rad>Rag, the main node 10 thus determines that the subnode 11d is the node which is at the right rear of the motor vehicle 2 and that the subnode 11g is the node which is at the front right.
• the main node 10 is configured to deactivate the power supply 21 of the first subnet Nwl (function f2 described previously).
• the deactivation of the power supply 21 of the first sub-network Nwl makes it possible to reduce the electrical consumption of the motor vehicle 2. It will be noted that the step of deactivating the power supply 21 of the first sub-network Nwl is optional.
• the main node 10 is configured to activate the power supply 21 of the second sub-network Nw2 (fl function described previously) which makes it possible to consider the secondary nodes 11 of the second sub-network Nw2.
• the secondary node 11b which is the reference secondary node II02 can send its unique network identifier Id to the main node 10 (wire function described previously).
• the secondary node 11c which is the reference secondary node II03 can send its unique network identifier Id to the main node 10 (wire function described previously) as well as the other secondary nodes 11 of the second sub-network Nw2.
• the main node 10 thus identifies the secondary reference node II02 and the secondary reference node II03 in the second sub-network Nw2 (function f3 described previously).
• the main node 10 identifies them with respect to the other secondary nodes 11 from which it has also received the unique network identifiers Id, because it knows that the two reference secondary nodes II02 and II03 are inside the motor vehicle 2 unlike the other nodes side 11 which are outside (in the non-limiting example taken).
• the main node 10 has identified them, but it does not yet know how to locate them, namely it does not yet know their exact position Pos: it does not yet know how to differentiate the secondary reference node II02 from the secondary reference node II03 .
• the main node 10 is configured to:
• the secondary reference node II02 does not need to measure the distance d with the secondary reference node II03.
• the main node 10 indicates this to him via the command c.
• the secondary reference node Ilos does not need to measure the distance d with the secondary reference node II02.
• the main node 10 indicates this to him via the command c.
• the main node 10 can send these commands c because it knows the unique network identifier Id of the secondary reference node II02, and the unique network identifier Id of the secondary reference node II03.
• the secondary reference node II02 Upon receipt of the command c, the secondary reference node II02, here 11b, is configured to perform distance measurements d (function f9 described previously) between itself and the other secondary nodes 11 of the second sub-network Nw2, here binds and llf, and send back to the main node 10 two primary distances dl referenced Rbe and Rbf, which are respectively the distance between itself and the secondary node binds, and between itself and the secondary node llf (function flO described previously).
• the secondary reference node II03 Upon receipt of the command c, the secondary reference node II03, here 11c, is configured to perform distance measurements d (function f9 described previously) between itself and the other secondary nodes 11 of the second sub-network Nw2, here binds and llf, and send back to the main node 10 two secondary distances d2 referenced Rce and Rcf, which are respectively the distance between itself and the secondary node binds, and between itself and the secondary node llf (function flO described previously).
• the main node 10 Upon receipt of the primary distances Rbe and Rbf, and of the secondary distances Rce and Rcf, the main node 10 is configured to compare them with each other according to a primary comparison (function f7'(10, dl-d2)) and according to a comparison secondary (function shown in figure 1 f7"(10, dl-dl, d2-d2)).
• the main node 10 is configured to compare each primary distance d1 with each secondary distance d2 corresponding to a Tl same other secondary node 11.
• the main node 10 compares Rce and Rbe, and Rcf and Rbf.
• the main node 10 is configured to locate the two reference secondary nodes II02, Ho3 of the second sub-network Nw2 according to the architecture T of the vehicle network Nv and said primary comparison (function illustrated in the figure 1 fl2(10, T, dl, d2, Pos(ld), II02, H03)).
• the main node 10 had identified that the secondary reference nodes II02, H03 could be at a position Pos center left or at a position Pos center right.
• Rce ⁇ Rbe and Rcf ⁇ Rbf In the nonlimiting example illustrated, Rce ⁇ Rbe and Rcf ⁇ Rbf.
• the main node 10 determines that the reference secondary node II03 (namely the secondary node 11c) is closer to the two secondary nodes 11e and llf than the reference secondary node II02 (namely the secondary node 11b). It therefore deduces therefrom that the secondary reference node II03 is therefore positioned at the center left, and that the secondary reference node II03 is therefore positioned at the center right. It therefore associates the unique network identifier Id of the secondary node 11b with the center left position Pos, and the unique network identifier Id of the secondary node 11c with the center right position Pos (function f4 described above).
• the main node 10 has thus located said secondary node 11b which is one of the two reference secondary nodes llo in the second sub-network Nw2, here II02, and said node secondary 11c which is the other of the two secondary reference nodes IIo, here II03, in the second sub-network Nw2.
• the secondary comparison (function f7") will make it possible to locate the other secondary nodes 11 of the second sub-network Nw2.
• the main node 10 is configured to compare the primary distances d1 between them and the secondary distances d2 between them
• the main node 10 compares Rce and Rcf, and compares Rbe and Rbf.
• Rce ⁇ Rcf and Rbe ⁇ Rbf In the nonlimiting example illustrated, Rce ⁇ Rcf and Rbe ⁇ Rbf.
• the function f7" is a particular case of the function f7 when 'there are two secondary reference nodes llo.
• the main node 10 determines that the secondary node binds is closer to the reference secondary node II03, here 11c, than the secondary node llf.
• Rbe ⁇ Rbf the main node 10 determines that the secondary node bind is also closer to the reference secondary node II02, here 11b, than the secondary node llf. The main node 10 therefore associates:
• the unique network identifier Id of the secondary node binds to the left rear Pos position which is closer to the left center Pos position and the right center position than the left front position
• the main node 10 is configured to locate the other secondary nodes 11 of the second sub-network Nw2 according to the architecture T of the vehicle network Nv and said secondary comparison (illustrated function f8"(10, T, d1, d2, Pos(ld), 11)).
• the main node 10 has thus located the other secondary nodes bind and llf in the second subnetwork Nw2.
• the function f8" is a special case of the function f8 when there are two secondary reference nodes.
• the main node 10 is further configured to deactivate the power supply 21 of the second subnet Nw2 (function f2 described previously).
• the device 1 for locating secondary nodes 11 of a vehicle 2 makes it possible to implement a method for locating 4 illustrated in FIGS. 6 to 12.
• step E1 F1 the main node 10 activates the power supply 21 of the first sub-network Nwl.
• step E2 illustrated F2(11, 10, Id) the m secondary nodes 11 of said first network Nwl send to said main node 10 their unique network identifier Id. They send it as soon as the first subnetwork Nwl is fed.
• step E3 F3(10, llo, Id, Nw) the main node 10 identifies the secondary reference node llo by means of its unique network identifier Id.
• the main node 10 knows the architecture T of the vehicle network Nv and in particular of each sub-network Nw, it will know with their unique network identifier Id which secondary nodes 11 are inside or outside of the motor vehicle 2. In the case where n>2 and m>2, in depending on the architecture T and the unique identifiers Id received, it will be able to determine a secondary reference node llo as being the one located inside while the other secondary nodes 11 of the second sub-network Nw2 are located at the outside or vice versa.
• step E4 F4(10, llo, Pos(ld), Nw) locates a secondary reference node llo in said first sub-network Nwl by means of its unique network identifier Id.
• the secondary reference node lio is the node 11b and it is at the center rear Pos position (referenced Posl).
• step E5 F5 the main node 10 deactivates the power supply 21 of the first sub-network Nwl after said location of said secondary reference node Hello. It will be noted that this step can also be performed in parallel or after step E9.
• step E6 illustrated F6(10, 21, ON, Nw) the main node 10 activates the power supply 21 of the second sub-network Nw2.
• step E7 illustrated F7(ll, 10, Id) the secondary node 11 of said second network Nw2 sends to said main node 10 its unique network identifier Id. It sends it as soon as the second sub-network Nw2 is supplied .
• a step E8 illustrated F8(10, T, Pos(ld), 11) the main node 10 identifies and locates the secondary node 11 in said second sub-network Nw2 by means of its unique network identifier Id and of the architecture T of the vehicle network Nv.
• the secondary node 11 in the second sub-network Nw2 is the secondary node 11a. It is located 11b at the center front Pos position (referenced Pos2).
• step E9 illustrated F9( 10, 21, OFF, Nw).
• the reference secondary node 110 is defined in this case in the sub-network Nw which comprises only one secondary node 11, namely here the first sub-network Nwl.
• the secondary reference node 110 is the node 11b and it is at the center right position Pos (referenced Pos1).
• step E5 illustrated F5(10, 21, ON, Nw) the main node 10 activates the power supply 21 of the second sub-network Nw2.
• step E6 F6(10, llo, c, d, Nw) the main node 10 sends a command c to said secondary reference node llo so that it measures a distance d between itself and each other secondary node 11 of said second subnet Nw2.
• the secondary nodes 11 of the second subnet Nwl2 are the nodes 11a and 11c.
• said secondary reference node 110 performs said distance measurement d. In this case, it performs two distance measurements d with the two secondary nodes 11 of the second sub-network Nw2.
• step E8 illustrated F8(llo, 10, d, Nw) said secondary reference node llo sends to said main node 10 said distances d between itself and the two secondary nodes 11 of the second sub-network Nw2. He thus sends two distances d.
• the distances d are the distances Rba (between said reference secondary node 11b and secondary node 11a) and Rbc (between said reference secondary node 11b and secondary node 11c).
• step E9 illustrated F9(10, 11, d) the main node 10 receives said distances d.
• a step E10 illustrated F10(10, d) the main node 10 compares them with each other. Thus, it will define that a distance d is greater than another. In the non-limiting example of FIG. 3, the distance Rba is greater than the distance Rbc.
• the main node 10 locates the secondary nodes 11 of the second sub-network Nw2 according to the architecture T of the vehicle network Nv and to this comparison. For each secondary node 11 of the second sub-network Nw2, it thus associates its unique network identifier Id with a position Pos in the motor vehicle 2.
• the main node 10 associates the unique network identifier Id of the secondary node lia with the center front position Pos of the motor vehicle 2 referenced Pos3, and the unique network identifier Id of the secondary node 11c at the center left position Pos of the motor vehicle 2 referenced Pos2.
• the main node 10 deactivates the power supply 21 of the first subnet Nwl (step E12 illustrated F12( 10, 21, OFF, Nw)) and the power supply 21 of the second sub-network Nw2 (step E13 illustrated F13(10, 21, OFF, Nw)).
• FIG. 8 illustrates these two steps as being consecutive, but they can of course be carried out in parallel.
• the secondary reference node Iloi is defined in the first sub-network Nwl and the secondary reference node II02 is defined in the second sub-network Nw2.
• the secondary reference node Iloi is the node 11b and it is at the rear center Pos position (referenced Posl)
• the secondary reference node II02 is the node Ila and it is at the front center Pos position (referenced Pos2).
• a step E5 illustrated F5(10, llo, c, d, Nw) the main node 10 sends a command c to said secondary reference node lloi, here 11b, of said first sub-network Nwl so that it measures a distance d between itself and each other secondary node 11 of said first sub-network Nwl.
• the other secondary nodes 11 of the first subnetwork Nwl are the nodes bind and llf.
• step E6 illustrated F6 (llo, I1, d, Nw)
• said secondary reference node llo performs said distance measurement d. In this case, it performs two distance measurements d with the two secondary nodes 11 of the first sub-network Nwl.
• said secondary reference node llo sends to said main node 10 said distances d between itself and the two secondary nodes 11 of the first sub-network Nwl. He thus sends two distances d.
• the distances d are the distances Rbe (between said reference secondary node 11b and the secondary node bind) and Rbf (between said reference secondary node 11b and the secondary node llf).
• step E8 illustrated F8(10, 11, d) the main node 10 receives said distances d.
• a step E9 illustrated F9(10, d) the main node 10 compares them with each other. Thus, it will define that a distance d is greater than another. In the non-limiting example of FIG. 4, the distance Rbf is greater than the distance Rbe.
• a step E10 illustrated F10(10, T, Pos(ld), 11) the main node 10 locates the other secondary nodes 11 of the first subnetwork Nwl according to the architecture T of the vehicle network Nv and of that comparison. For each secondary node 11 of the first sub-network Nwl (apart from the secondary reference node lloi which it has already located), it thus associates its unique network identifier Id with a position Pos in the motor vehicle 2.
• the main node 10 associates the unique network identifier Id of the secondary node binds to the rear left position Pos of the motor vehicle 2 referenced Pos3, and the unique network identifier Id of the secondary node llf at the front left Pos position of the motor vehicle 2 referenced Pos4.
• a ninth step Eli illustrated Fll(10, 21, OFF, Nw)
• the main node 10 deactivates the power supply 21 of the first subnet Nwl after said location of the secondary nodes 11 of the first subnet Nwl. It will be noted that this step can also be performed in parallel or after step E22.
• the main node 11 After the location of the secondary nodes 11 of the first sub-network Nwl, the main node 11 will be able to locate the secondary nodes 11 of the second sub-network Nw2. To this end, it performs the following steps.
• step E12 illustrated F12(10, 21, ON, Nw) the main node 10 activates the power supply 21 of the second sub-network Nw2.
• step E13 illustrated F13(11, 10, Id) the m secondary nodes 11 of said second sub-network Nw2 send to said main node 10 their unique network identifier Id. They send it as soon as the second sub-network Nw2 is powered.
• step E14 illustrated F14 (10, llo, Id, Nw)
• the main node 10 identifies the secondary reference node II02 in said second sub-network Nw2 by means of its unique network identifier Id.
• the main node 10 knows the architecture T of the vehicle network Nv and in particular of each sub-network Nw, it will know with their unique network identifier Id which secondary nodes 11 are inside or outside of the motor vehicle 2. Depending on the architecture T and the unique identifiers Id received, it will be able to determine the secondary reference node II02, here lia, as being the one located inside in the non-limiting example while that the other secondary nodes 11 (here 11c and lld) of the second subnet Nw2 are located outside.
• step E15 F15(10, llo, Pos(ld), Nw) locates a secondary reference node II02 in said second sub-network Nwl by means of its unique network identifier Id.
• step E16 F16(10, llo, c, d, Nw)
• the main node 10 sends a command c to said secondary reference node II02 so that it measures a distance d between itself and each other secondary node 11 of said second subnet Nw2.
• the other secondary nodes 11 of the second sub-network Nw2 are the nodes 11c and lld.
• step E17 illustrated as F17(110, 11, d, Nw) said secondary reference node 110 performs said distance measurement d. In this case, it performs two distance measurements d with the two secondary nodes 11 of the second sub-network Nw2.
• said secondary reference node llo sends to said main node 10 said distances d between itself and the other secondary nodes 11 of the second sub-network Nw2.
• the distances d are the distances Rac (between said secondary reference node lia and secondary node 11c) and Rad (between said secondary reference node lia and subnode lld).
• step E19 illustrated F19(10, 11, d) the main node 10 receives said distances d.
• a step E20 illustrated F20(10, d) the main node 10 compares them with each other. Thus, it will define that a distance d is greater than another. In the non-limiting example of FIG. 4, the distance Rad is greater than the distance Rac.
• the main node 10 locates the other secondary nodes 11 of the second sub-network Nw2 according to the architecture T of the vehicle network Nv and of that comparison. For each secondary node 11 of the second sub-network Nw2 (apart from the secondary reference node II02 which it has already located), it thus associates its unique network identifier Id with a position Pos in the motor vehicle 2.
• the secondary reference node Iloi is defined in the first sub-network Nwl
• the secondary reference node II02 and the secondary reference node II03 are defined in the second sub-network Nw2.
• the secondary reference node lloi is the node lia and it is at the position before center Pos (referenced Posl);
• the secondary reference node II02 is the node 11b and it is at the center right position Pos (referenced Pos2)
• the secondary reference node II03 is the node 11c and it is at the center left position Pos (referenced Pos7).
• step E11 can also be carried out in parallel or after step E23.
• step E14 illustrated F14 (10, llo, Id, Nw)
• the main node 10 identifies the two secondary reference nodes II02, H03 in said second sub-network Nw2 by means of their unique network identifier Id .
• the two reference secondary nodes II02, H03 of the second sub-network Nw2 are respectively the secondary nodes 11b and 11c.
• the main node 10 knows the architecture T of the vehicle network Nv and in particular of each sub-network Nw, it will know with their unique network identifier Id which secondary nodes 11 are inside or outside of the motor vehicle 2. Depending on the architecture T and the unique identifiers Id received, it will be able to determine the secondary reference node II02, here 11b, and the secondary reference node II03, here 11c, as being those which are located inside while the other secondary nodes 11 (here lie and llf) of the second sub-network Nw2 are outside. On the other hand, for the moment, the main node 10 does not yet know how to differentiate the secondary reference node II02 from the secondary reference node II03 and therefore locate them precisely. Thanks to the architecture T of the vehicle network Nv, the main node 10 just knows that among the secondary reference node 11b and the secondary reference node 11c, there is one which is at the center right position and the other in the center left position.
• the main node 10 sends a command c to said secondary reference nodes II02, H03 so that they measure a distance d between themselves and each other secondary node 11 of said second sub-network Nw2.
• the other secondary nodes 11 of the second sub-network Nw2 are the nodes bind and llf.
• step E16 illustrated F16(110, 11, d, Nw)
• said secondary reference nodes II02, II03 perform said distance measurement d.
• they each perform two distance measurements d with the two secondary nodes 11 of the second sub-network Nw2.
• said secondary reference nodes II02, II03 send to said main node 10 said distances d between themselves and the other secondary nodes 11 of the second subnet Nw2.
• the main node 10 receives said primary distances d1 coming from the first secondary reference node II02 and said secondary distances d2 coming from the second secondary reference node II03.
• a step E19 illustrated F19(10, d1-d2) the main node 10 compares each primary distance d1 with each secondary distance d2 corresponding to the same other secondary node 11. This comparison is called primary comparison. Thus, in the non-limiting example of FIG. 5, it will compare Rce and Rbe, and Rcf and Rbf. Thus, it will define that a primary distance d1 is greater or less than a secondary distance d2. In the non-limiting example of FIG. 5, Rce ⁇ Rbe and Rcf ⁇ Rbf.
• the main node 10 deduces that the reference secondary node II03 (here 11c) is closer to the secondary nodes bind and llf than the secondary reference node II02 (here 11b).
• the secondary reference node II02 (here 11b) is at the right center Pos position (referenced Pos2) and that the reference secondary node II03 (here 11c) at the left center Pos position (referenced Pos7), the position Pos2 being farther from the positions Pos3 and Pos4 than the position Pos7.
• the main node 10 deduces therefrom that the secondary reference node II02 (here 11b) is at the center left position Pos (referenced Pos7) and the secondary reference node II03 (here 11c) at the position Pos center right (referenced Pos2).
• the secondary reference node II02 here 11b
• the secondary reference node II03 here 11c
• Pos center right referenced Pos2
• Rce ⁇ Rbe and Rcf ⁇ Rbf it associates the unique network identifier Id of the secondary reference node 11b with the center right position Pos of the motor vehicle 2 referenced Pos2 and the unique network identifier Id of the secondary reference node 11c at the center left position Pos of the motor vehicle 2 referenced Pos7.
• the main node 10 locates thus the two secondary reference nodes II02, H03. Thus, it associates their unique network identifier Id with a position Pos in the motor vehicle 2. In the non-limiting example of FIG. 5, it determines that the secondary reference node II02 is positioned at the center right of the motor vehicle 2 whereas the secondary reference node II03 is positioned at the center left.
• the main node 10 compares the primary distances d1 with each other and the secondary distances d2 with each other.
• the main node 10 compares the primary distances Rbe and Rbf with each other, and the secondary distances Rce and Rcf with each other.
• the secondary reference node llf is at the rear left Pos position (referenced Pos6) because it is closer to the secondary reference node II02, here 11b, and to the secondary reference node II03, here 11c.
• the location method 4 comprises the step of deactivating the power supply of said second sub-network Nw2 after said location of the other secondary nodes 11 of said second sub-network Nw2.
• the description of the invention is not limited to the embodiments described above and to the field described above.
• the invention can be applied to fields other than the field of motor vehicles, such as, in non-limiting examples, the field of railways, the field of aeronautics, the field of IOTs including connected objects.

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• 2021
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