Method and device for controlling a system for displaying an authorised speed limit of a vehicle travelling on a road portion

Abstract

The invention relates to a method and a device for controlling a system for displaying an authorised speed limit of a vehicle (10) travelling on a road portion (1001). To this end, the method comprises receiving first data from an on-board image-acquisition system of the vehicle, the first data being representative of a first speed limit displayed on a traffic sign (1002) positioned at the edge of the road portion; transmitting second data representative of a geographical position of the vehicle; and receiving third data representative of a second speed limit associated with the geographical position of the vehicle. The first speed limit and the second speed limit are then compared and the display system is controlled according to a result of the comparison and the first and second speed limits.

Description

DESCRIPTION Title: Method and device for controlling a system for displaying the authorized speed limit of a vehicle traveling on a section of road The present invention claims priority from French application 2308835 filed on 08 / 22 / 2023, the content of which (text, drawings and claims) is incorporated herein by reference. Technical field

[0001] The present invention relates to methods and devices for controlling a system for displaying an authorized speed limit for a vehicle traveling on a portion of road. Technological background

[0002] Some modern vehicles have at least one or more systems configured to determine the speed limit that applies to the section of road being used. The speed limit corresponds, for example, to the maximum speed allowed on this section of road or to the recommended speed.

[0003] A speed limit determination system is in the form of an ISA (Intelligent Speed ​​Adaptation) system or an SLI (Speed ​​Limitation Indication) system, each of which corresponds to an ADAS (Advanced Driver-Assistance System) system comprising means for assisting the driver of the vehicle to avoid exceeding a speed limit.

[0004] ISA or SLI systems are thus configured to detect or warn the driver when the vehicle is subject to a speed limit or enters a limited speed zone, or where different speed limits may apply depending on the context (type of vehicle, time, night, rain, roadworks, etc.).

[0005] To determine this speed limit and derive a speed instruction, ISA or SLI systems typically use information about the road and / or the road environment. To this end, ISA systems most often include at least one front camera embedded in the vehicle, the on-board camera having the road in front of the vehicle in its field of vision.

[0006] The ISA or SLI systems also include image processing means configured to recognize road or traffic signs from the image data received from the camera, the speed limit applicable on the portion of road used being determined from the recognized sign(s).

[0007] One of the disadvantages of these systems is that they generally rely solely on speed limit information obtained by reading the signs, but some signs may be poorly recognized or even not seen because they are masked by an element of the environment, for example a sign may be masked by a tree branch or a vehicle parked between the road and the sign. The determination of the speed limit determined by the ISA or SLI systems is then erroneous. Summary of the present invention

[0008] An object of the present invention is to solve at least one of the problems of the technological background described above.

[0009] Another object of the present invention is to make the speed limit determined by an on-board system more reliable.

[0010] Another object of the present invention is to improve the control of one or more ADAS systems of the vehicle, for example the SLI or ISA system.

[0011] According to a first aspect, the present invention relates to a method for controlling a system for displaying an authorized speed limit of a vehicle traveling on a portion of road, the method comprising the following steps: - reception of first data from an on-board image acquisition system of the vehicle, the first data being representative of a first speed limit displayed on a road sign positioned at the edge of the section of road; - transmission of second data representative of a geographical position of the vehicle; - reception of third data representative of a second speed limit associated with the geographical position of the vehicle; - comparison of the first speed limit and the second speed limit; - control of the display system based on a result of the comparison and the first and second limit speeds.

[0012] Such a method makes it possible to verify the first speed read on a road sign by comparing it to a second speed received. The redundancy of this information makes the display of a speed limit more reliable.

[0013] According to a variant of the method, the display system is controlled as follows: - the second speed limit is displayed when the first and second speed limits are different or when no first data is received, and - the first speed limit is displayed if the first and second speed limits are equal or if no third data is received.

[0014] The first speed limit is thus displayed when it is equal to the second speed limit or in the absence of a second speed limit received.

[0015] According to a variant of the method, the geographical position of the vehicle is defined in coordinates of a geolocation system.

[0016] These coordinates can then be used by other systems, for example to define the position of the vehicle, particularly in relation to a road network.

[0017] According to one variant, the method comprises the following steps: - reception of fourth data representative of a first image acquired by a camera of the image acquisition system; - detection of an object associated with the traffic sign in the image; - determination of the first speed limit shown on the road sign; - transmission of the first data representative of the first speed limit.

[0018] These steps allow you to read and / or determine an initial speed limit shown on a sign positioned on the edge of the section of road traveled by the vehicle.

[0019] According to a variant of the method, the second data is transmitted to a remote device.

[0020] A remote device includes, for example, up-to-date information on speed limits associated with sections of the road network on which the vehicle is traveling.

[0021] According to a variant of the method, the remote device is a server associated with a connected service.

[0022] A connected service allows you to bring more functionality to the vehicle and improve the performance or reliability of some of its functions.

[0023] According to a variant of the method, the steps of transmitting second data and receiving third data are carried out via a wireless communication channel.

[0024] The vehicle can thus exchange data with a remote device at any time and from any position.

[0025] According to a second aspect, the present invention relates to a device for controlling a system for displaying an authorized speed limit of a vehicle, the device comprising a memory associated with a processor configured for implementing the steps of the method according to the first aspect of the present invention.

[0026] According to a third aspect, the present invention relates to a vehicle, for example of the automobile type, comprising a device as described above according to the second aspect of the present invention.

[0027] According to a fourth aspect, the present invention relates to a computer program which comprises instructions adapted for executing the steps of the method according to the first aspect of the present invention, in particular when the computer program is executed by at least one processor.

[0028] Such a computer program may use any programming language, and may be in the form of source code, object code, or intermediate code between source code and object code, such as in a partially compiled form, or in any other desirable form.

[0029] According to a fifth aspect, the present invention relates to a computer-readable recording medium on which is recorded a computer program comprising instructions for carrying out the steps of the method according to the first aspect of the present invention.

[0030] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium may include a storage medium, such as a ROM memory, a CD-ROM or a microelectronic circuit type ROM memory, or a magnetic recording medium or a hard disk.

[0031] Furthermore, this recording medium may also be a transmissible medium such as an electrical or optical signal, such a signal being able to be conveyed via an electrical or optical cable, by conventional or hertzian radio or by self-directed laser beam or by other means. The computer program according to the present invention may in particular be downloaded from a network such as the Internet.

[0032] Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to perform or to be used in performing the method in question. Brief description of the figures

[0033] Other characteristics and advantages of the present invention will emerge from the description of the particular and non-limiting exemplary embodiments of the present invention below, with reference to the appended figures 1 to 5, in which:

[0034] [Fig. 1] schematically illustrates an environment of a vehicle, according to a particular and non-limiting exemplary embodiment of the present invention;

[0035] [Fig. 2] schematically illustrates a part of a passenger compartment of the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention;

[0036] [Fig. 3] schematically illustrates a display screen of the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention;

[0037] [Fig. 4] schematically illustrates a device configured to control a system for displaying an authorized speed limit of the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention;

[0038] [Fig. 5] illustrates a flowchart of the different steps of a method for controlling a system for displaying an authorized speed limit of a vehicle of the vehicle of FIG. 1, according to a particular and non-limiting exemplary embodiment of the present invention. Description of examples of implementation

[0039] A method and a device for controlling a system for displaying an authorized speed limit of a vehicle will now be described in the following with joint reference to Figures 1 to 5. The same elements are identified with the same reference signs throughout the description which follows.

[0040] The terms "first(s)", "second(s)" (or "first(s)", "second(s)"), etc. are used in this document by arbitrary convention to identify and distinguish different elements (such as operations, means, etc.) implemented in the embodiments described below. Such elements may be distinct or correspond to a single element, depending on the embodiment.

[0041] According to a particular and non-limiting example of embodiment of the present invention, the control of a system for displaying an authorized speed limit of a vehicle traveling on a section of road is for example implemented by one or more processors of an on-board system of the vehicle.

[0042] For this purpose, the method comprises receiving first data from an on-board image acquisition system of the vehicle, the first data being representative of a first speed limit displayed on a road sign positioned at the edge of the road portion, transmitting second data representative of a geographical position of the vehicle and receiving third data representative of a second speed limit associated with the geographical position of the vehicle. The first speed limit and the second speed limit are then compared and the display system is controlled according to a result of the comparison and the first and second speed limits.

[0043] Figure 1 schematically illustrates an environment 1 in which a vehicle 10 moves, according to a particular and non-limiting exemplary embodiment of the present invention.

[0044] Figure 1 illustrates a road environment 1 comprising a portion of road 1001 on which the vehicle 10 travels. The portion of road 1001 is for example located in an urban environment, on a departmental or national road, on a two-lane road or on a motorway.

[0045] The vehicle 10 corresponds, for example, to a vehicle with a thermal engine, with electric motor(s) or even a hybrid vehicle with a thermal engine and one or more electric motors. The vehicle 10 thus corresponds, for example, to a land vehicle, for example a car, a truck, a bus, a motorcycle. Finally, the vehicle 10 corresponds to an autonomous vehicle or not, that is to say a vehicle traveling according to a determined level of autonomy or under the total supervision of the driver.

[0046] According to a particular embodiment, the vehicle 10 has a system for detecting road signs, and more particularly speed limit signs applicable on roads. Such a road sign 1002 is illustrated in FIG. 1 and corresponds to an example according to which the maximum speed authorized on the section of road used by vehicle 10 is 90 km / h.

[0047] The speed limit applicable on a section of road depends on several parameters and is indicated to road users by one or more signs such as sign 1002.

[0048] Some example settings are listed below for illustration: - the country in which the vehicle is operated; - the type of road or traffic lane: for example, motorway, road with 2 carriageways separated by a central reservation, section of road with at least 2 lanes allocated to the same direction of travel, two-way road without a central divider, built-up area; - local restrictions (presence of a school, a place name, a particular danger, etc.).

[0049] Thus in France, the maximum authorized speeds according to the type of road, in a general case, are as follows: - motorway: 130 km / h; - road with 2 carriageways separated by a central reservation: 110 km / h; - section of road with at least 2 lanes allocated to the same direction of travel: 90 km / h; - two-way road without central divider: 80 km / h. - built-up areas: 50 km / h.

[0050] The sign recognition and detection system is, for example, coupled with or includes a speed limit indication system, known as an SLI system.

[0051] The sign recognition and detection system advantageously comprises an image acquisition system, the image acquisition system comprising a camera, for example a CVM (multifunction video camera), arranged to have in its field of vision the environment located in front of the vehicle 10 when the latter is moving. The CVM camera is for example arranged inside the vehicle 10, in the passenger compartment, behind the windshield, for example at the level of the interior central rearview mirror. The camera acquires a set of images of the environment passing in front of the vehicle 10, the image data being processed by a processor of the on-board system to detect and recognize road signs.

[0052] When a speed limit sign is detected and recognized, the speed limit written on this sign is recognized by image processing using a processor of the on-board system. Such information is transmitted, for example to another computer of the on-board system of the vehicle, for example the IVI (In-Vehicle Infotainment) computer, to display an icon representative of the sign and the associated maximum authorized speed or to display the maximum authorized speed value detected on a display screen 12, 13 for example arranged (FIG. 2) in the dashboard 11 of the vehicle 10, on the dashboard 11 of the vehicle 10 or on a head-up display (also called Head-Up Display, called VTH or HUD).

[0053] As illustrated in Figure 2, the vehicle 10 has at least one display screen 12, 13, corresponding for example to a screen of the LCD type (from the English "Liquid Crystal Display" or in French "Display à cristals liquide"), for example of the TFT type (from the English "Thin-Film Transistor" or in French "Thin Film Transistor"), or OLED (from the English "Organic Light-Emitting Diode" or in French "Organic Electroluminescent Diode"). The display screen 12, 13 is for example arranged in the center of the dashboard 11, for example above a central facade. Of course, the position of the display screen 12, 13 is not limited to this example, the display screen 12, 13 being able to be arranged in any position, for example on the central facade or behind a steering wheel 14.

[0054] The display screen 12, 13 makes it possible to display content intended for the driver and passengers of the vehicle. The display screen 12, 13 is, according to an exemplary embodiment, also configured to allow the driver and / or passengers of the vehicle 10 to interact with one or more systems embedded in the vehicle via a human machine interface (HMI) displayed on the display screen 12, 13. For example, the display screen 12, 13 makes it possible to control the system vehicle infotainment, as well as for example the system responsible for displaying an authorized speed limit of the vehicle 10, as described below.

[0055] According to a particular exemplary embodiment, illustrated in FIG. 3, a first graphic object 222 representing the authorized speed limit is displayed on the display screen 12, 13 in a display area 21.

[0056] According to this same example, a second graphic object 221 representing a current travel speed of the vehicle 10 is displayed on the display screen 12, 13 in the display area 21.

[0057] The vehicle 10 has a geolocation system on board, for example by satellite, to determine the current position of the vehicle 10, the vehicle 10 having for this purpose a receiver of a system of the GPS type (from the English “Global Positioning System”) or Galileo for example in communication with a computer of the on-board system of the vehicle 10.

[0058] According to an alternative embodiment, the maximum authorized speed information is obtained from a remote device 101 of the “cloud” 100. According to this alternative, the vehicle 10 transmits its geographical position obtained from the geolocation system on board the vehicle 10 to the remote device 101. The remote device 101 then sends the speed limit associated with the portion of road 1001 on which the vehicle 10 is traveling, the portion of road 1001 being determined by the remote device 101 as a function of the geographical position of the vehicle 10.

[0059] The vehicle 10 also carries a communication system configured to communicate with one or more remote devices such as the remote device 101 via a wireless communication network infrastructure. The remote device 101 advantageously corresponds to a device configured to process data, for example data stored in the memory of the remote device 101 and / or data received from the vehicle 10. The remote device 101 corresponds for example to a server of the “cloud” 100.

[0060] The communication system of the vehicle 10 comprises, for example, one or more communication antennas connected to a telematic control unit, called a TCU (Telematic Control Unit).

[0061] The mobile communication infrastructure enabling wireless data communication between the vehicle 10 and the remote data processing device 101 comprises, for example, one or more communication devices 110 of the relay antenna (cellular network) or roadside unit, known as UBR. In a communication mode using such a network architecture, the data is, for example, exchanged between the vehicle 10 and the remote device 101 of the “cloud” 100 via a relay antenna or UBR 110 (the antenna 110 being, for example, connected to the “cloud” 100 via a wired link).

[0062] The wireless communication system allowing the exchange of data between the vehicle 10 and the remote device 101 corresponds for example to: - a vehicle-to-infrastructure (V2I) communication system, for example based on the 3GPP LTE-V or IEEE 802.11 p ITS G5 standards; or - a cellular network type communication system, for example an LTE (Long-Term Evolution), LTE-Advanced, LTE 4G or 5G type network; or - a Wifi type communication system according to IEEE 802.11, for example according to IEEE 802.11 n or IEEE 802.11 ac.

[0063] The TCU unit, the computers of the vehicle 10 (including for example the IVI computer, the computer in charge of the image acquisition system, the computer in charge of the panel recognition system and / or the SLI system) form the on-board system of the vehicle 10. The antenna(s) of the communication system, the TCU unit, the sensors, and the computers form for example a multiplexed architecture for the realization of different services useful for the proper functioning of the vehicle and for assisting the driver and / or the passengers of the vehicle in the control of the vehicle 10, for example by displaying speed limit information displayed on a display device on board the vehicle 10. The The computers and the TCU communicate and exchange data with each other via one or more computer buses, for example a communication bus of the CAN (Controller Area Network), CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (according to the ISO 17458 standard) or Ethernet (according to the ISO / IEC 802-3 standard) data bus type.

[0064] A process for controlling a speed limit display system on board the vehicle 10 is advantageously implemented by one or more processors of a device on board the vehicle 10, such a device corresponding for example to a computer or a combination of computers of the vehicle 10, for example the IVI computer.

[0065] In a first operation, the first data are received from an on-board image acquisition system of the vehicle 10.

[0066] In a second operation, the second data is output.

[0067] These second data are for example transmitted by the telematics control unit to the remote device 101 via the vehicle communication system 10.

[0068] According to a particular exemplary embodiment, this second data is transmitted via a wireless communication channel, according to a communication mode previously presented.

[0069] According to a particular exemplary embodiment, the remote device 101 is a server associated with a connected service. The connected service then makes it possible to determine a second speed limit associated with the portion of road 1001 on which the vehicle 10 is traveling.

[0070] The geographical position of the vehicle 10 is for example defined in coordinates of a first reference frame, that of the geolocation system of the vehicle 10. The reference frame used for the definition of these coordinates is for example identical to the reference frame used by the remote device 101 or is comparable, the device 101 then transforming the coordinates of the position of the vehicle 10 determined in the first reference frame to geographic coordinates used by the remote server 101.

[0071] The remote server 101 then determines the portion of road 1001 on which the vehicle 10 is located based on the geographical position of the vehicle 10 and determines a second speed limit associated with this portion of road 1001.

[0072] According to a first particular exemplary embodiment, this second speed limit is recorded in a database comprising a set of road sections and a speed limit associated with each road section of this set.

[0073] According to a second particular exemplary embodiment, this second speed limit is determined according to legislation and a type of road, the remote device 101 having a database comprising a set of road portions and a type of road associated with each road portion of this set.

[0074] The remote device 101 then transmits third data representative of a second speed limit associated with said geographical position of the vehicle 10.

[0075] According to a particular exemplary embodiment, this third data is transmitted via a wireless communication channel, for example identical to the previous communication channel.

[0076] The vehicle communication system 10 comprises, for example, one or more communication antennas connected to the TCU unit.

[0077] In a third operation, the third data are received, for example by the IVI computer of the vehicle 10 via the communication system of the vehicle 10 connected to the IVI computer by a communication bus.

[0078] In a fourth operation, the first limit speed and the second limit speed are compared.

[0079] In a fifth operation, the display system is controlled based on a result of the comparison and the first and second limit speeds.

[0080] According to a particular embodiment, the display system is controlled as follows: - the second speed limit is displayed when the first and second speed limits are different or when no first data is received, and - the first speed limit is displayed if the first and second speed limits are equal or if no third data is received.

[0081] Thus, the first speed limit determined by the image acquisition system is displayed on a screen 12, 13 of the vehicle 10 as long as no contradictory information is received.

[0082] When the second speed limit received is different from the first speed limit determined, the latter is then displayed on a screen 12, 13 of the vehicle 10 instead of the first speed limit.

[0083] The speed limit is then displayed on a screen 12, 13 of the vehicle 10, for example in the form of the graphic object 222 positioned in the display area 21.

[0084] The displayed speed limit is then more reliable because it is obtained via two separate channels, a first internal channel using the on-board image acquisition system of the vehicle 10 and a second channel using a connected service.

[0085] The comparison of the first and second speed limits improves the reliability of the control process of a system for displaying an authorized speed limit of the vehicle 10 traveling on the road section 1001 thanks to the redundancy of information relating to the authorized speed limit.

[0086] According to an alternative embodiment, the above process comprises the following operations allowing the sending of the first data.

[0087] The camera of the image acquisition system acquires an image representative of the environment of the vehicle 10, a road sign 1002 placed on the edge of the portion of road 1001 being present in this environment.

[0088] The image acquired by the camera is presented in the form of data representing pixels characterized by: - coordinates in the image; and - data relating to the colors and brightness of objects in the observed scene in the form, for example, of RGB colorimetric coordinates (from the English “Red Green Blue”) or TSL (Tone, Saturation, Brightness).

[0089] In a sixth operation, fourth data representative of the image acquired by the camera of the image acquisition system are received, for example by an image processing device of the image acquisition system.

[0090] In a seventh operation, an object associated with traffic sign 1002 is detected in the image.

[0091] The object is detected, for example, using a traffic sign recognition program, for example by comparing the object to a set of objects representing different types of traffic signs. For example, the shape of the object is compared to various shapes of traffic signs, including a round, triangular, square, or rectangular outline.

[0092] In an eighth operation, the first speed limit shown on traffic sign 1002 is determined.

[0093] The speed recorded on the panel, and therefore on the object of the image, is for example determined by character recognition or by comparison of the object with a set of panels in a database recorded in a memory of a device of the on-board system or a device of the image acquisition system.

[0094] In a ninth operation, first data are emitted, representative of the first speed limit previously determined from a speed limit displayed on the traffic sign 1002 positioned on the edge of the section of road 1001.

[0095] The first data are for example transmitted by the image acquisition system to the IVI computer via a communication bus of the on-board system of the vehicle 10.

[0096] Figure 4 schematically illustrates a device 3 configured for controlling a system for displaying an authorized speed limit of a vehicle, for example of the vehicle 10, according to a particular and non-limiting exemplary embodiment of the present invention. The device 3 corresponds for example to a calculator or a device of the system for displaying an authorized speed limit of the vehicle 10.

[0097] The device 3 is for example configured for the implementation of the operations described with regard to figures 1, 2 and 3 and / or the steps of the method described with regard to figure 5. Examples of such a device 3 include, but are not limited to, on-board electronic equipment such as an on-board computer of a vehicle, an electronic calculator such as an ECU (“Electronic Control Unit”), a smartphone, a tablet, a laptop, a server. The elements of the device 3, individually or in combination, can be integrated in a single integrated circuit, in several integrated circuits, and / or in discrete components. The device 3 can be produced in the form of electronic circuits or software (or computer) modules or even a combination of electronic circuits and software modules.

[0098] The device 3 comprises one (or more) processor(s) 30 configured to execute instructions for carrying out the steps of the method and / or for executing the instructions of the software(s) embedded in the device 3. The processor 30 may include integrated memory, an input / output interface, and various circuits known to those skilled in the art. The device 3 further comprises at least one memory 31 corresponding for example to a volatile and / or non-volatile memory and / or comprises a memory storage device which may comprise volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic or optical disk.

[0099] The computer code of the embedded software(s) including the instructions to be loaded and executed by the processor is for example stored in the memory 31.

[0100] According to various particular and non-limiting exemplary embodiments, the device 3 is coupled in communication with other similar devices or systems and / or with communication devices, for example the TCU unit, for example via a communication bus or through dedicated input / output ports.

[0101] According to a particular and non-limiting exemplary embodiment, the device 3 comprises a block 32 of interface elements for communicating with external devices. The interface elements of the block 32 comprise one or more of the following interfaces: - RF radio frequency interface, for example Wi-Fi® type (according to IEEE 802.11), for example in the 2.4 or 5 GHz frequency bands, or Bluetooth® type (according to IEEE 802.15.1), in the 2.4 GHz frequency band, or Sigfox type using UBN (Ultra Narrow Band) radio technology, or LoRa in the 868 MHz frequency band, LTE (Long-Term Evolution), LTE-Advanced; - USB interface (from the English “Universal Serial Bus” or “Universal Serial Bus” in French); - HDMI interface (from the English “High Definition Multimedia Interface” or “High Definition Multimedia Interface” in French); - LIN interface (from the English “Local Interconnect Network”).

[0102] According to another particular and non-limiting exemplary embodiment, the device 3 comprises a communication interface 33 which makes it possible to establish communication with other devices (such as other computers of the on-board system) via a communication channel 330. The communication interface 33 corresponds for example to a transmitter configured to transmit and receive information and / or data via the communication channel 330. The communication interface 33 corresponds for example to a wired network of the CAN (Controller Area Network) type, CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (standardized by the ISO 17458 standard) or Ethernet (standardized by the ISO / IEC 802-3 standard).

[0103] According to a particular and non-limiting exemplary embodiment, the device 3 can provide output signals to one or more external devices, such as a display screen 12, 13, 340, touch-sensitive or not, one or more speakers 350 and / or other 360 peripherals (projection system) via output interfaces 34, 35 and 36 respectively. According to a variant, one or other of the external devices is integrated into the device 3.

[0104] Figure 5 illustrates a flowchart of the different steps of a method for controlling a system for displaying an authorized speed limit of a vehicle, for example of the vehicle 10, according to a particular and non-limiting exemplary embodiment of the present invention. The method is for example implemented by a device of the system for displaying an authorized speed limit of the vehicle 10 or by the device 3 of Figure 4.

[0105] In a first step 41, first data are received from an on-board image acquisition system of the vehicle 10, the first data being representative of a first speed limit displayed on a traffic sign 1002 positioned at the edge of the road portion 1001.

[0106] In a second step 42, second data representative of a geographical position of the vehicle 10 are transmitted.

[0107] In a third step 43, third data representative of a second limit speed associated with the geographical position of the vehicle 10 are received.

[0108] In a fourth step 44, the first limit speed and the second limit speed are compared.

[0109] In a fifth step 45, the display system is controlled based on a result of the comparison and the first and second limit speeds.

[0110] According to a variant of the method, the following steps allow the transmission of the first data previously received.

[0111] According to this variant, in a sixth step 41a, fourth data representative of a first image acquired by a camera of the image acquisition system are received.

[0112] According to this variant, in a seventh step 41 b, an object associated with the traffic sign 1002 is detected in the image.

[0113] According to this variant, in an eighth step 41c, the first speed limit shown on the traffic sign 1002 is determined.

[0114] According to this variant, in a ninth step 41 d, first data representative of the first limit speed are emitted.

[0115] According to a variant, the variants and examples of the operations described in relation to figures 1 to 3 apply to the steps of the method of figure 5.

[0116] Of course, the present invention is not limited to the exemplary embodiments described above but extends to a method for controlling a system for displaying an authorized speed limit of a vehicle traveling on a portion of road which would include secondary steps without thereby departing from the scope of the present invention. The same would apply to a device configured for implementing such a method.

[0117] The present invention also relates to a vehicle, for example an automobile or more generally an autonomous land-based motor vehicle, comprising the device 3 of figure 4.

Claims

CLAIMS 1. Method for controlling a system for displaying an authorized speed limit of a vehicle (10) traveling on a portion of road (1001), said method comprising the following steps: - reception (41) of first data from an on-board image acquisition system of said vehicle (10), said first data being representative of a first speed limit displayed on a traffic sign (1002) positioned at the edge of the portion of road (1001); - transmission (42) of second data representative of a geographical position of said vehicle (10); - reception (43) of third data representative of a second limit speed associated with said geographical position of the vehicle (10); - comparison (44) of said first limit speed and said second limit speed; - control (45) of said display system as a function of a result of said comparison and of the first and second limit speeds.

2. Method according to claim 1, wherein the display system is controlled in the following manner: - the second speed limit is displayed when the first and second speed limits are different or when no first data is received, and - the first speed limit is displayed if the first and second speed limits are equal or if no third data is received.

3. Method according to one of claims 1 to 2, for which said geographical position of the vehicle (10) is defined in coordinates of a geolocation system.

4. Method according to one of claims 1 to 3, which comprises the following steps: - reception (41a) of fourth data representative of a first image acquired by a camera of said image acquisition system; - detection (41b) of an object associated with said traffic sign (1002) in said picture ; - determination (41c) of said first speed limit shown on said traffic sign (1002); - transmission (41 d) of said first data representative of said first limit speed.

5. Method according to one of claims 1 to 4, for which said second data are transmitted (42) to a remote device (101).

6. Method according to claim 5, wherein said remote device (101) is a server associated with a connected service.

7. Method according to one of claims 1 to 6, for which the steps of transmitting (42) second data and receiving (43) third data are carried out via a wireless communication channel.

8. Computer program comprising instructions for implementing the method according to any one of the preceding claims, when these instructions are executed by a processor.

9. Device (3) for controlling a system for displaying an authorized speed limit of a vehicle, said device (3) comprising a memory (31) associated with at least one processor (30) configured for implementing the steps of the method according to any one of claims 1 to 7.

10. Vehicle (10) comprising the device (3) according to claim 9.

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