Adapting a navigation function during autonomous vehicle driving

Abstract

The invention relates to a method for controlling a navigation function in a motor vehicle, comprising receiving (201) descriptive information about a destination from a user interface and obtaining (202-205) a current activation state for an autonomous driving function of the vehicle. If the current activation state of the autonomous driving function is a deactivated or unavailable state, a device (208) controls the default navigation function, which includes displaying visual guidance instructions on a screen and speaking audible guidance instructions through a vehicle speaker, to indicate a route to the destination. If the current activation state is an activated state, the device adapts (206) the navigation function to inhibit at least one guidance instruction from among the visual or audible guidance instructions of the default navigation function. FIG. 2

Description

Title of the invention: Adaptation of a navigation function during autonomous vehicle piloting

[0001] The present invention belongs to the field of navigation functions in a motor vehicle, and in particular in motor vehicles comprising a driving assistance function capable of implementing autonomous driving of the motor vehicle.

[0002] The term “vehicle” means any type of vehicle such as a motor vehicle of a private type, utility vehicle or heavy goods vehicle.

[0003] The term "driving assistance" for a vehicle refers to any method capable of assisting the driving of the vehicle. This method may consist of partially or fully steering the vehicle or providing any type of assistance to a person driving the vehicle. Driving assistance functions can relate to different levels of autonomy. The OICA (International Organization of Motor Vehicle Manufacturers) scale notably provides for six levels. Other scales exist to define the levels of autonomy enabled by driving assistance systems, such as the SAE (Society of Automotive Engineers) scale.

[0004] Thus, driving assistance covers manual driving assistance functions, for the lowest levels, such as levels 1 and 2 of the aforementioned scales, and autonomous vehicle piloting functions for the highest levels of autonomy.

[0005] Driver assistance systems, such as AD AS for "Advanced Driver-Assistance Systems", allow the driver of the vehicle to be assisted or even to fully control certain parameters of the vehicle's steering, such as longitudinal trajectory, speed in particular, and lateral trajectory, turning or changing lanes in particular.

[0006] These systems make it possible to improve driving comfort as well as safety, by taking advantage of data from vehicle sensors, such as radar or lidar data, cameras and / or geolocation devices.

[0007] In parallel with such functions, most vehicles have a navigation function capable of receiving destination identification data from the driver, determining a route to the destination, and guiding the driver along the route. To do this, the navigation function is capable of displaying visual guidance instructions on a screen in the vehicle and of providing audible guidance instructions via a vehicle speaker. Guidance instructions, audible or visual, indicating information useful for navigating the vehicle to its destination, such as a direction to take at an intersection or roundabout, a speed limit on the road on which the vehicle is traveling, a distance to the next road exit.

[0008] However, some of the guidance instructions are not necessary when the vehicle's autonomous driving function is activated, since the driver no longer has control over the vehicle's trajectory. These guidance instructions then become intrusive and can disturb passengers, or even interrupt content displayed by the vehicle's infotainment system.

[0009] There is therefore a need to avoid untimely guidance instructions being displayed or spoken during autonomous driving of the vehicle.

[0010] The present invention improves the situation.

[0011] To this end, a first aspect of the invention relates to a method of controlling a navigation function in a motor vehicle, comprising the following steps: - receiving descriptive information of a destination from a user interface; - obtaining a current activation state of an autonomous vehicle piloting function; - if the current activation state of the autonomous driving function is a disabled state or an unavailable state, control of the default navigation function, including a display of at least one visual guidance instruction on a vehicle screen and / or a pronunciation of at least one audible guidance instruction on a vehicle speaker, to indicate a route to the destination; - if the current activation state is an activated state, adapt the navigation function to inhibit at least one guidance instruction from said at least one visual guidance instruction or said at least one audible guidance instruction of the default navigation function.

[0012] Thus, inhibiting at least one guidance instruction while the autonomous driving function is activated reduces the driver's workload even when they are not manually piloting the vehicle. The navigation function is therefore automatically adapted from its default mode upon detection of the activation of the autonomous driving function.

[0013] According to embodiments, the method may further include receiving an activation state of the autonomous piloting function from a driving assistance module capable of implementing the autonomous piloting function, and updating the current activation state of the autonomous piloting function in a memory, according to the activation state received.

[0014] Thus, it is permissible to store, at any time, the current activation state of the autonomous piloting function, which facilitates the adaptation of the navigation function.

[0015] In addition, the method may further include, following the attainment of the current state indicating a deactivated state of the autonomous piloting function, checking the default navigation function, then, following the receipt of a new activation state from the driving assistance module indicating an activated state of the autonomous piloting function, updating the current state in memory and adapting the navigation function to inhibit at least one guidance instruction from said at least one visual guidance instruction or said at least one audible guidance instruction of the default navigation function.

[0016] Thus, the navigation function can be switched between a default mode and an adapted mode, in real time, depending on the activation and deactivation of the autonomous piloting function.

[0017] Alternatively, following the attainment of the current state indicating an activated state of the autonomous piloting function, the method includes adapting the navigation function, then, following the receipt of a new activation state from the driving assistance module indicating a deactivated state of the autonomous piloting function, updating the current state in memory and controlling the default navigation function.

[0018] Thus, the navigation function can be switched between a default mode and an adapted mode, in real time, depending on the activation and deactivation of the autonomous piloting function.

[0019] According to embodiments, the control of the default navigation function may include the display of at least one visual guidance instruction on the vehicle screen and the pronunciation of at least one audible guidance instruction on the vehicle speaker, and the adaptation of the navigation function may include at least the inhibition of any audible guidance instruction.

[0020] Thus, untimely guidance instructions during autonomous vehicle driving are considerably reduced. In particular, if audio content is being played by the infotainment system, it is not interrupted by unnecessary guidance instructions in the normal driving situation.

[0021] In addition, the adaptation of the navigation function may include the inhibition of any audible guidance instruction and at least one visual guidance instruction.

[0022] Thus, untimely guidance instructions during autonomous vehicle piloting are considerably reduced, both audibly and visually.

[0023] A second aspect of the invention relates to a computer program comprising instructions for implementing the method according to the first aspect of the invention, when these instructions are executed by a processor.

[0024] A third aspect of the invention relates to a control device for a navigation function in a motor vehicle, comprising: - a first interface configured to obtain from a current state of activation of an autonomous vehicle piloting function; - a second interface configured to receive descriptive information about a destination from a user interface; - a processor configured to, if the current activation state of the autonomous driving function is a disabled state or an unavailable state, control the default navigation function, including a display of at least one visual guidance instruction on a vehicle screen and / or a pronunciation of at least one audible guidance instruction on a vehicle speaker, to indicate a route to the destination; the processor being further configured to, if the current activation state is an activated state, adapt the navigation function to inhibit at least one guidance instruction from said at least one visual guidance instruction or said at least one audible guidance instruction of the default navigation function.

[0025] Other features and advantages of the invention will become apparent from an examination of the detailed description below, and the accompanying drawings in which:

[0026] [Fig-1] illustrates a motor vehicle according to embodiments of the invention;

[0027] [Fig.2] is a diagram illustrating the steps of a control process for a navigation function according to embodiments of the invention;

[0028] [Fig.3] illustrates a graphical interface of a navigation function displayed on a vehicle screen, according to embodiments of the invention;

[0029] [Fig.4] illustrates a control device for a vehicle navigation function automobile, according to embodiments of the invention.

[0030] Figure 1 illustrates a motor vehicle 100, according to embodiments of the invention

[0031] The vehicle 100 includes, in particular, a control device 101, which may be a centralized control device responsible for a plurality of functions of the motor vehicle. The control device 101 may be of the ECU type, for "Electronic Control Unit".

[0032] According to the invention, the control device 101 can at least be responsible for controlling a navigation function, the navigation function comprising: - obtaining real-time vehicle position data via a satellite positioning module, such as GPS for "Global Positioning System"; - obtaining user input via a user interface 104 to navigate the navigation function, and in particular to enter descriptive data for one of the- destination, such as an address or a point of interest; - the display of map data, indicating the current position of the vehicle, on a screen 102 of the vehicle. The screen 102 can, for example, be in a central position at the front of the vehicle's passenger compartment. There are no restrictions attached to access to the map data, which can be stored in the vehicle's memory or obtained from a wireless communication interface of the vehicle, such as a cellular interface capable of communicating with a cellular network, such as 3G, 4G or 5G, for example, to access a remote server; - the display of visual guidance instructions with map data on screen 102, when the user has previously entered a destination. The guidance instructions may include a current speed limit, a distance to the next exit to follow the route to the destination, highlighting of roads to follow along the route and / or any other information intended to allow the driver to pilot the vehicle to the destination; - the pronunciation of audible guidance instructions via at least one loudspeaker 103 arranged inside the passenger compartment of the vehicle 100.

[0033] According to the invention, the navigation function has a default configuration in which it implements the actions described above. The default configuration may include more actions than those listed above. For example, when approaching an on-ramp or off-ramp of a national highway or motorway, or when approaching a lane divider, the system may zoom in on an area related to the on-ramp / off-ramp or lane divider, so that the driver can clearly distinguish the lane to take to continue the journey to the destination. Such a zoom may be considered a visual guidance instruction, in addition to the visual guidance instructions listed above. Other actions not described herein may also be included by default.

[0034] The user can manually configure the navigation function, in order to add additional actions, or on the contrary to inhibit certain actions, such as audible guidance instructions for example.

[0035] In [Fig. 1], the user interface 104 and the screen 102 are separate. However, the screen 102 may be a touchscreen, of the capacitive or resistive type for example, and in this case user inputs may be made by touch inputs directly on the screen 102. However, the vehicle 100 may further include a user interface 104 which may include one or more buttons for navigating the navigation function displayed on the screen 102, and / or which may include a microphone capable of receiving user inputs in the form of voice commands.

[0036] The vehicle 100 further includes a vehicle driver assistance module 102, also called AD AS, for "Advanced Driver Assistance Systems", capable of implement one or more driver assistance functions based in particular on data from at least one sensor 106.

[0037] According to the invention, the AD AS 102 module is capable of implementing at least one autonomous vehicle steering function, namely a function in which the longitudinal and lateral trajectories of the vehicle are controlled without requiring any action from the driver on the steering wheel or pedals. Depending on the level of autonomy associated with the autonomous driving function, the driver may be required to remain vigilant and ready to take back control of the vehicle for manual driving in the event of a malfunction of the autonomous driving function or in a given driving situation incompatible with autonomous vehicle steering.

[0038] No restriction is attached to the at least one sensor 106, which may include a radar, a lidar and / or a camera directed outwards and towards the front of the vehicle 100 in a direction of travel of the vehicle 100.

[0039] The vehicle 100 may further include an infotainment system implementing one or more infotainment functions, the infotainment functions being capable of displaying content on the screen 102 and / or of reproducing audio data via said at least one speaker 103.

[0040] Through user input, the driver or passenger can navigate among the various vehicle functions, and can in particular switch between the navigation function and infotainment functions. Alternatively, several functions can be controlled simultaneously when a graphical interface displayed on screen 102 is divided into several zones, each zone being dedicated to a given function, with the first zone being dedicated to the navigation function.

[0041] No restrictions are attached to the communication links between the modules and sensors of the vehicle 100 described above.

[0042] For example, the control unit 101 and the AD AS 105 module can communicate via a wired CAN connection. The control unit 101 can, in particular, transmit CAN network frames to the AD AS 105 module, in an ADASIS format for example. These network frames contain information about the route to be followed to a destination selected by the user in the navigation function. Such route information can be used by the AD AS 105 module to accept or reject a command from the user to activate the vehicle's autonomous driving function, depending on the type of road or the maneuvers required to reach the destination.

[0043] According to the invention, the control device 101 can also receive information from the AD AS module 105, via the same CAN wired connection, or via an additional CAN connection, regarding the activation status of the autonomous driving function of the vehicle 100. The activation status information can indicate to the less an activated state or a deactivated state. In addition, a third state indicating that the autonomous driving function is unavailable can be indicated by the information relating to the activation state.

[0044] Fig. 2 is a diagram illustrating the steps of a method for controlling a navigation function in vehicle 100, according to embodiments of the invention.

[0045] The process described below can be implemented in the control device 101 described with reference to [Fig.1].

[0046] At a step 200, the control device 101 activates the navigation function, for example, following the receipt of user input on the screen 102, when it is a touchscreen, or on the interface 104, to select the activation of the navigation function, for example, by pressing a menu icon displayed on the graphical interface of the screen 102, the icon representing the navigation function. Activation of the navigation function may include the display of map data showing the current position of the vehicle and / or a destination input area.

[0047] At a step 201, following step 200 of activation of the navigation function, the control device 101 receives descriptive information of a destination, from the screen 102, when it is touch-sensitive, or from the interface 201.

[0048] In parallel with steps 200 and 201, the method may include receiving descriptive information about the activation state of the autonomous driving function of the vehicle 100, including receiving descriptive information indicating an activated state of the autonomous driving function in a step 202, and / or receiving descriptive information indicating a deactivated, or unavailable, state of the autonomous driving function in a step 203. The descriptive information about the activation state of the driving function, received in steps 202 and / or 203, may be received from the AD AS 105 module, in particular in CAN network frames as described above.

[0049] At a step 204, following each step 202 or 203, the control device 101 updates a current activation state of the autonomous piloting function in a memory of the control device 101. Thus, following a step 202, the control device 101 updates the current activation state to the activated state, while following a step 203, the control device 101 updates the current activation state to the deactivated or unavailable state.

[0050] Thus, the control device 101 keeps the current activation state of the autonomous piloting function up to date, from the last activation state received at a step 202 or 203.

[0051] Steps 200 and 201, 202, 203 and 204 are shown in parallel because the user can activate / deactivate the vehicle's autonomous driving function on the one hand, and The navigation function can be activated in an order determined by the user's choices. However, it should be noted that to activate the autonomous driving function, the user must first enter a destination in step 201, allowing the autonomous driving function to guide the vehicle to that destination.

[0052] At a step 204, following step 201, the control device 101 determines whether the current state of the autonomous piloting function by memory consultation is the activated state or is the deactivated or unavailable state.

[0053] If the current state of the autonomous piloting function is the activated state, the process proceeds to step 205, in which the navigation function is adapted so as to inhibit at least one guidance instruction with respect to the default navigation function.

[0054] Inhibiting at least one guidance instruction avoids unnecessarily soliciting the driver when it is not necessary, since the vehicle 100 is piloted autonomously by the autonomous piloting function, which is commonly in the activated state.

[0055] No restriction is attached to said at least one inhibited guidance instruction.

[0056] Said at least one inhibited guidance instruction may be one or more of the The following guidance instructions apply: - at least one audio guidance instruction, and preferably all audio guidance instructions. Indeed, by default, the navigation function can include the pronunciation, via said at least one speaker 103, of audio guidance instructions, in particular to indicate directions to take or a distance to a next exit to take; - a visual guidance instruction indicating a speed limit. Indeed, by default, the navigation function may include the display of a speed limit near a current road displayed on the screen's graphical interface; - a visual guidance instruction, indicating a next direction to take and / or a distance to the next direction to take; - a visual guidance instruction causing, when approaching an entry or exit ramp of a national road or motorway, or when approaching a lane separation, a zoom on an area concerned by the entry / exit ramp or lane separation; - any other visual guidance instruction providing useful information for manual vehicle operation, and displayed by default when controlling the navigation function on the screen's graphical interface.

[0057] In other words, the navigation function provides by default a set of at least one audible guidance instruction and / or a set of at least one visual guidance instruction, and the adaptation of step 205 includes the inhibition of at least one of these guidance instructions, audible or visual, provided by default by the navigation function. In some embodiments, several guidance instructions are inhibited during step 205.

[0058] At step 207, the control device 101 determines whether new user input is received from the interface 102 or the screen 104. If not, step 206 continues. Note that step 206 can be considered a continuous phase, with a real-time update of the vehicle's current position in the map data displayed on the screen 102 by the appropriate navigation function.

[0059] If a new user input is received at step 207, the process returns to step 203, step 200 or step 201, depending on the user input received.

[0060] For example, if the new user input detected in step 207 disables the autonomous piloting function, descriptive information about an activation state of the autonomous piloting function, indicating a disabled state, is received in step 203 from the AD AS 105 module, and the control device 101 updates the current activation state of the autonomous piloting function in memory in step 204. Following the update in step 204, the control device executes step 205 again, which indicates to proceed to step 208 described below, since the current activation state is then a disabled state.

[0061] If the new user input detected in step 207 disables the navigation function, then the process is interrupted, and resumes at a next activation of the navigation function in a next step 200.

[0062] If the new user input detected in step 207 changes the destination of the navigation function, the control device 101 executes step 201 again in order to determine a new route, then step 205 is also executed: as the current activation state of the autonomous piloting function is still in the activated state, the process returns to step 206 with the adaptation of the navigation function applied to the new destination.

[0063] Step 206 continues in this manner until a user input to stop the navigation function, to add a new destination or to disable the autonomous piloting function is detected via screen 102 or via interface 104 in step 207.

[0064] Referring again to step 205, if the control device 101 determines that the current activation state of the autonomous piloting function is the deactivated or unavailable state, the method proceeds to step 207, in which the control device 101 executes the default navigation function, comprising at least one audible guidance instruction and at least one visual guidance instruction, without inhibiting such guidance instructions unless the user manually inhibited one or more of them.

[0065] Note that step 208 can be considered as a continuous phase, with a real-time update of the current position of the vehicle in the map data displayed on screen 102 by the default navigation function.

[0066] While the default navigation function is being executed in step 208, the control device 101 checks whether a new user input is detected. If no new user input is detected, step 208 continues. If a new user input is detected to stop the navigation function, change the destination, or activate the autonomous piloting function, the process returns to step 200, step 201, or step 202, depending on the detected user input.

[0067] For example, if the new user input detected in step 209 activates the autonomous piloting function, descriptive information of an activation state of the autonomous piloting function, indicating an activated state, is received in step 202 from the AD AS 105 module, and the control device 101 updates the current activation state of the autonomous piloting function in memory in step 204. Following the update in step 204, the control device executes step 205 again, which indicates to proceed to step 206 described above, since the current activation state is then an activated state.

[0068] If the new user input detected in step 209 disables the navigation function, then the process is interrupted, and resumes at a next activation of the navigation function in a next step 200.

[0069] If the new user input detected in step 209 changes the destination of the navigation function, the control device 101 executes step 201 again in order to determine a new route, then step 205 is also executed: as the current activation state of the autonomous piloting function is still in the deactivated state, the process returns to step 208 with the execution of the default navigation function applied to the new destination.

[0070] Fig. 3 presents a graphical interface 300 of a navigation function displayed on a screen 102 of a motor vehicle, according to embodiments of the invention.

[0071] The graphical interface 300 can be the graphical interface displayed by the navigation function adapted by the control device 101 during step 206 described previously.

[0072] The graphical interface 300 includes a cursor 301 indicating a current position of the vehicle 100 relative to map data, including a route to follow 302 which is differentiated from other roads not forming part of the route to the destination.

[0073] As previously stated, adapting the navigation function involves inhibiting at least one guidance instruction. In the example in [Fig. 3], the audible guidance instructions are inhibited, which is represented by a pictogram 303 indicating a mute mode for the navigation function, but the visual guidance instructions are maintained and may include: - a guidance instruction in the form of a sign 304 near the road to be followed 302, indicating a speed limit that applies to the road to be followed 302; and - a guidance instruction in the form of window 305 indicating a distance to the next exit to take to follow the route to the destination.

[0074] Thus, in the example of [Fig. 3], only the audible guidance instructions are inhibited, while the visual guidance instructions are maintained. Therefore, step 208 of the default navigation function control can include the display of a graphical interface on the screen that includes the same elements as graphical interface 300, except that, on the default graphical interface displayed in step 208, pictogram 303 indicates that the audible guidance instructions are activated, and no longer muted as on the adapted graphical interface 300.

[0075] Alternatively, at least one of the visual guidance instructions is disabled and the audible guidance instruction is maintained during the adaptation of step 206: for example, window 305 or panel 304 is removed. Alternatively, at least one visual guidance instruction and at least one audible guidance instruction are disabled during step 206 of the navigation function adaptation.

[0076] According to one embodiment, all guidance instructions, visual and audible, are inhibited at step 206.

[0077] Figure 4 shows the structure of a control device 101 according to embodiments of the invention.

[0078] The control device 101 includes a processor 401 configured to communicate unidirectionally or bidirectionally, via one or more buses or via a direct wired connection, with a memory 402 such as a Random Access Memory (RAM), a Read Order Memory (ROM), or any other type of memory (Flash, EEPROM, etc.). Alternatively, the memory 402 comprises several memories of the aforementioned types.

[0079] The memory 402 is capable of storing, permanently or temporarily, at least some of the data used and / or resulting from the implementation of the process described with reference to [Fig.2].

[0080] In particular, memory 402 can store map data for implementing the navigation function. The map data includes both route layouts and contextual information about the roads, such as respective speed limits for road sections, in particular. Memory 402 can also store the current activation state of the autonomous driving function, updated at each step 204, as described previously.

[0081] The processor 401 is capable of executing instructions, stored in memory 402, for the implementation of the steps of the process according to the invention, described with reference to [Fig. 2]. Alternatively, the processor 401 can be replaced by a microcontroller designed and configured to perform the steps of the process according to the invention, described with reference to [Fig. 2].

[0082] The control device 101 includes a first interface 403 capable of communicating with the AD AS module 105. The first interface 403 may be a CAN port as described above and is configured to receive, from the AD AS module 105, the activation states of the autonomous driving function during steps 202 and 203 described above. Furthermore, the first interface 403 may be bidirectional and may be configured to transmit to the AD AS module 105 descriptive information about the route to the destination selected by the driver.

[0083] The control device 101 may further include a second interface 404 capable of receiving user input from interface 104, or from screen 102 when it is touch-sensitive, to navigate in the navigation function, in particular to receive user input to activate the navigation function at step 200, and to enter a destination at step 201.

[0084] The control device 101 may further include a third interface 405 capable of transmitting control signals to the screen 102 and the loudspeaker 103, during steps 206 and 208 described above, in particular to display the current position of the vehicle 100 and the map data, and to display or pronounce the guidance instructions which are maintained during step 206, or which are default during step 208.

[0085] When the screen 102 is a touch screen, the second and third interfaces 404 and 405 can be one and the same interface.

[0086] The control device 101 may include other interfaces for communicating with other equipment of the vehicle 100.

[0087] The present invention is not limited to the embodiments described above by way of example; it extends to other variants.

Claims

Claims

1. Method for controlling a navigation function in a motor vehicle (100), comprising the following steps: - receiving (201) descriptive information of a destination from a user interface; - obtaining (202 - 205) a current activation state of an autonomous driving function of the vehicle; - if the current activation state of the autonomous driving function is a deactivated state or an unavailable state, controlling (208) the default navigation function, comprising a display of at least one visual guidance instruction (304; 305) on a screen (102) of the vehicle and / or a pronunciation of at least one audible guidance instruction on a loudspeaker (103) of the vehicle, to indicate a route to the destination;- if the current activation state is an activated state, adaptation (206) of the navigation function to inhibit at least one guidance instruction from among said at least one visual guidance instruction or said at least one audible guidance instruction of the default navigation function.;

2. Method according to claim 1, further comprising receiving (202; 203) an activation state of the autonomous driving function, from a driving assistance module (105) capable of implementing the autonomous driving function, and updating (204) the current activation state of the autonomous driving function, in a memory (402), as a function of the activation state received.

3. Method according to claim 2, further comprising, following obtaining (203) the current state indicating a deactivated state of the autonomous driving function, controlling (208) the default navigation function, then, following receiving (202; 209) a new activation state from the driving assistance module indicating an activated state of the autonomous driving function, updating (204) the current state in the memory and adapting (206) the navigation function to inhibit at least one guidance instruction from among said at least one visual guidance instruction or said at least one audible guidance instruction of the default navigation function.

4. The method of claim 2, further comprising, upon obtaining (202) the current state indicating an activated state of the function autonomous piloting, adaptation (206) of the navigation function, then, following receipt (207; 203) of a new activation state from the driving assistance module indicating a deactivated state of the autonomous piloting function, updating (204) of the current state in the memory and control (208) of the default navigation function.

5. Method according to one of the preceding claims, in which the control (208) of the default navigation function comprises the display of at least one visual guidance instruction on the screen (102) of the vehicle (100) and the pronunciation of at least one audio guidance instruction on the loudspeaker (103) of the vehicle, and in which the adaptation of the navigation function comprises at least the inhibition of any audio guidance instruction.

6. Method according to claim 5, in which the adaptation (206) of the navigation function comprises the inhibition of any audio guidance instruction and at least one visual guidance instruction.

7. Computer program comprising instructions for implementing the method according to one of the preceding claims, when these instructions are executed by a processor (401).

8. Control device (101) of a navigation function in a motor vehicle (100), comprising: - a first interface (403) configured to obtain a current activation state of an autonomous driving function of the vehicle; - a second interface (404) configured to receive descriptive information of a destination from a user interface; - a processor (401) configured to, if the current activation state of the autonomous driving function is a deactivated state or an unavailable state, control the default navigation function, comprising a display of at least one visual guidance instruction on a screen of the vehicle and / or a pronunciation of at least one audible guidance instruction on a loudspeaker of the vehicle, to indicate a route to the destination;the processor being further configured to, if the current activation state is an activated state, adapt the navigation function to inhibit at least one guidance instruction from among said at least one visual guidance instruction or said at least one audible guidance instruction of the default navigation function.;

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