Method and device for controlling a windshield defogging system on a vehicle

Abstract

The present invention relates to a method and device for controlling a front windshield defogging system of a vehicle, comprising a touchscreen (12). For this purpose, data representing fog detection on the front windshield is received. A control button for the front windshield defogging system is displayed on the touchscreen (12) according to a first graphic representation (320). A command to activate the front windshield defogging system is transmitted by pressing the control button. (See Figure 3 for the abstract.)

Description

Title of the invention: Method and device for controlling a windshield defogging system of a vehicle. Technical field

[0001] The invention relates to methods and devices for controlling a windshield defogging system on a vehicle, particularly, but not exclusively, a motor vehicle. The invention specifically relates to a method and device for displaying a control button for activating a vehicle's defogging system. Technological background

[0002] Modern vehicles are equipped with a front windshield demister configured to demist or defrost the vehicle's windshield. The system generally operates by using the vehicle's heating or air conditioning system, by projecting warm air onto the vehicle's front windshield. This system can also be used to defrost the front windshield.

[0003] The front windshield defogging system is controlled by manually activating a front windshield defogging control device, generally located on the vehicle's center console, either as a physical button to activate the front windshield defogging system or as a touch button displayed on a touchscreen of the vehicle. Pressing this button activates the defogging of the vehicle's front windshield by blowing a powerful stream of hot, dry air onto the windshield.

[0004] When condensation begins to form and spread on the vehicle's windshield, visibility is reduced, thus requiring increased attention from the driver. Controlling the windshield defogger system with a physical button can therefore be complicated and unintuitive, as the physical button is usually located on a row of similarly sized and shaped physical buttons. The driver, who must pay closer attention to the road as visibility decreases, may find it difficult to quickly press the physical button to activate the defogger.

[0005] Similar difficulties are encountered in the case of a touch-sensitive trigger button on a vehicle's touchscreen HMI (Human-Machine Interface). This button is generally located in a submenu and requires several successive clicks on the screen to activate it. If the button is located on the HMI's home screen, it is usually situated among other touch buttons of similar size and shape, requiring greater precision to click the button.

[0006] In both cases, the situation causes a decrease in the driver's attention to activating the defogging of the vehicle's front windshield via the defogging system due to this complexity and / or poor visibility. Summary of the present invention

[0007] One object of the present invention is to solve at least one of the problems of the technological background described above.

[0008] An object of the present invention is, for example, to facilitate the control or command of a defogging system for a front windshield of a vehicle.

[0009] Another object of the present invention is, for example, to minimize the loss of driver attention and to improve vehicle safety.

[0010] According to a first aspect, the present invention relates to a method for controlling a front windshield defogging system of a vehicle, the vehicle having a display system including a touch screen, the method being implemented by a processor and comprising the following steps: - receipt of initial data indicating the detection of condensation on the vehicle's front windshield - Display control of a defogging system control button on a main display area of ​​the touchscreen according to an initial graphical representation based on initial data, the size of the control button according to the initial graphical representation being greater than a first determined threshold, - reception of second data points representing a touch press on the control button, - transmission of third data representing a command to activate the front windshield defogging system to a controller of the front windshield defogging system, the transmission being triggered by the reception of the second data.

[0011] Detecting the presence of fog on the vehicle's windshield allows for a significant response depending on driving conditions, increasing vehicle safety. Displaying a large defogging system control button on the touchscreen, i.e., larger than a predetermined threshold, allows for quick and intuitive operation compared to a small physical or touch button, without the driver needing to take their eyes off the road to search for the button. This improves the driver's focus on the road, thereby enhancing the safety of the vehicle and other road users.

[0012] According to one variant, the first threshold represents a ratio between the size of the control button and a total size of a main display area of ​​the touch screen.

[0013] According to one variant, the first threshold is equal to 90%.

[0014] According to one variant, the first threshold is equal to 50%.

[0015] According to another variant, the first threshold is configurable via an HMI (Human-Machine Interface) of the vehicle.

[0016] According to yet another variant, the method further includes a step of controlling the display of the control button of the demisting system on the touch screen according to a second graphic representation, a size of the control button according to the second graphic representation being less than a second threshold, the second threshold being less than the first threshold.

[0017] According to another variant, the display of the control button according to the second graphic representation is carried out on a secondary display area of ​​the touch screen.

[0018] According to a second aspect, the present invention relates to a control device for a front windshield defogging system of a vehicle, the device comprising a memory associated with a processor configured for the implementation of the steps of the process according to the first aspect of the present invention.

[0019] 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.

[0020] According to a fourth aspect, the present invention relates to a computer program which includes instructions adapted for carrying out the steps of the process according to the first aspect of the present invention, in particular when the computer program is executed by at least one processor.

[0021] Such a computer program may use any programming language, and be in the form of source code, object code, or an intermediate code between source code and object code, such as in a partially compiled form, or in any other desirable form.

[0022] 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 process according to the first aspect of the present invention.

[0023] On the one hand, the recording medium can be any entity or device capable of storing the program. For example, the medium can include a storage means, such as a ROM, a CD-ROM or a microelectronic circuit-type ROM, or a magnetic recording means or a hard disk drive.

[0024] On the other hand, this recording medium can also be a transmissible medium such as an electrical or optical signal, such a signal being able to be transmitted via an electrical or optical cable, by conventional or radio frequency or by beam self-steering laser or by other means. The computer program according to the present invention can in particular be downloaded onto an Internet-type network.

[0025] Alternatively, the recording medium may be an integrated circuit in which the computer program is incorporated, the integrated circuit being adapted to execute or to be used in the execution of the process in question. Brief description of the figures

[0026] Other features and advantages of the present invention will become apparent from the description of the particular and non-limiting embodiments of the present invention below, with reference to the attached Figures 1 to 7, in which:

[0027] [Fig-1] schematically illustrates part of a vehicle's passenger compartment, according to a example of a particular embodiment of the present invention;

[0028] [Fig.2] schematically illustrates a screen of the vehicle of [Fig.1], according to a first a particular and non-limiting example of a realization of the present invention;

[0029] [Fig.3] schematically illustrates the vehicle screen of [Fig.1], according to a second a particular and non-limiting example of a realization of the present invention;

[0030] [Fig.4] schematically illustrates the vehicle screen of [Fig.1], according to a third a particular and non-limiting example of a realization of the present invention;

[0031] [Fig.5] schematically illustrates the vehicle screen of [Fig.1], according to a fourth a particular and non-limiting example of a realization of the present invention;

[0032] [Fig.6] illustrates a device configured to control a demisting system of front windshield of the vehicle of [Fig.1], according to a particular and non-limiting embodiment of the present invention.

[0033] [Fig.7] illustrates a flowchart of the different stages of a control process of a front windshield washer system of the vehicle of [Fig.1], according to a particular and non-limiting embodiment of the present invention. Description of examples of achievements

[0034] A method and a control device for a front windshield demisting system of a vehicle will now be described in what follows with joint reference to Figures 1 to 7. The same elements are identified with the same reference signs throughout the following description.

[0035] The terms "first," "second" (or "firsts," "seconds"), etc., are used in this document by arbitrary convention to allow for the identification and distinction of 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.

[0036] According to a particular and non-limiting embodiment of the present invention, the control of a front windshield defogging system (also called a system The windshield defrosting system of a vehicle is implemented by one or more vehicle control units (CUs), specifically by one or more processors within that CU. The vehicle also includes a display system comprising a touchscreen interface, controlled by a CU, for example, the vehicle's infotainment system CU, known as the IVI (In-Vehicle Infotainment) CU.

[0037] Initial data representing the detection of condensation on the vehicle's windshield are received. This initial data corresponds, for example, to the amount of moisture present on the windshield.Upon receiving the initial data, the control unit adjusts the display of the defogger control button according to a first graphical representation. The size of the control button in this initial graphical representation is larger than a predetermined threshold to ensure it is easily visible and accessible to vehicle users. Second data points, representing a touch input on the control button, are received from the touchscreen interface, for example, when a user touches the touchscreen at the button's display location.In response to this second data, third data representing a command to activate the front windshield demisting system is transmitted to a controller of the front windshield demisting system, for example to trigger the projection of hot air onto the front windshield through one or more ventilation grilles.

[0038] Fig. 1 schematically illustrates a part of the passenger compartment of vehicle 10, according to a particular and non-limiting embodiment of the present invention.

[0039] Vehicle 10 corresponds, for example, to a vehicle with an internal combustion engine, with electric motor(s), or even a hybrid vehicle with an internal combustion engine and one or more electric motors. Vehicle 10 thus corresponds, for example, to a land vehicle, for example a car, a truck, a bus.

[0040] The vehicle 10 advantageously incorporates a so-called front windshield demisting (or defrosting) system configured to demist or defrost the front windshield of the vehicle 10 via the action of hot, dry air projected at high power onto the windshield by the ventilation and / or air conditioning system for this purpose.

[0041] In one embodiment of the present invention, the vehicle 10 includes a central console having a set 11 of physical buttons, configured to control various functions and / or different systems of the vehicle 10, for example the switching on / off of the hazard lights, the activation or not of the air conditioning.

[0042] According to one example, a physical button among the set of physical buttons 11 enables the activation and deactivation of the vehicle 10 defogging function.

[0043] The vehicle 10 includes a display system comprising a touch screen interface, referred to as touch screen 12, and a computer configured to control the display of content(s) of a graphical human-machine interface, referred to as HMI, on the touch screen 12. The computer corresponds, for example, to the computer of the infotainment system, referred to as the IVI computer (from the English "In-Vehicle Infotainment" or in French "Infodivertissement étoilé") of the vehicle 10.

[0044] The touch screen 12 corresponds for example to an LCD type screen (from the English "Liquid Crystal Display" or in French "Affichage à cristals liquide"), for example of type TFT (from the English "Thin-Film Transistor" or in French "Transistor en film mince"), or OLED (from the English "Organic Light-Emitting Diode" or in French "Diode électroluminescente organique").

[0045] Figure 2 schematically illustrates the touch screen 12, according to a particular and non-limiting embodiment of the present invention.

[0046] According to one embodiment, the touchscreen 12 consists of a main display area 21 and a secondary display area 22. For example, the main display area 21 is used to display a set of information for the driver and / or passengers of the vehicle 10, for example navigation information, or information relating to the operating status of the vehicle 10. According to an embodiment illustrated in [Fig. 2], the secondary display area 22 is used to display various touch buttons for controlling systems of the vehicle 10, for example a control button for the front windshield defogger system shown according to a second graphic representation 220.

[0047] According to another embodiment, the touch screen 12 consists of a single main display area 21, occupying the entire available display area of ​​the touch screen 12, for example in the case where the vehicle's center console 10 has a set of physical buttons 11, not requiring the display of such buttons on the touch screen 12.

[0048] The touchscreen 12 is configured to display content for the driver and passengers of the vehicle 10. The touchscreen 12 is also configured to allow the driver and / or passengers of the vehicle 10 to interact with one or more systems embedded in the vehicle 10 via a human-machine interface (HMI) displayed on the touchscreen 12. For example, the touchscreen 12 is configured to interact with the IVI system and / or the front windshield defogging system of the vehicle 10.

[0049] The vehicle display system 10 is connected in communication with the vehicle's front windshield defogging system 10; for example, the control unit in charge of the display system (for example, the IVI control unit) is connected in communication to the computer (also called controller) in charge of the front windshield demisting system via one or more data buses of the vehicle's on-board network 10.

[0050] A problem that arises then concerns the driver of vehicle 10 pressing a control button for the front windshield defogging system, either, for example, a physical button from the physical button assembly 11, or a touch button displayed according to a second graphical representation 220 on the touchscreen 12, when defogging the front windshield is necessary. This small front windshield defogging system control button requires increased precision from the driver of vehicle 10, while their attention must be focused on the road, as visibility decreases as fog builds.

[0051] A control process for the front windshield defogging system of the vehicle 10 is advantageously implemented by one or more processors, for example one or more processors of the IVI computer and / or one or more processors of the computer or controller in charge of the front windshield defogging system.

[0052] In a first operation of the process, at least one processor of the vehicle 10, for example the IVI computer or a set of computers, receives initial data representative of a detection of the presence of fog on the front windshield of the vehicle 10.

[0053] This initial data is, for example, received from a defogging sensor on the vehicle 10. This sensor measures the humidity present on the front windshield of the vehicle 10. For example, the initial data corresponds to a measured value of the humidity on the front windshield. According to another example, the initial data represents information indicating the presence of condensation on the front windshield of the vehicle 10.

[0054] In another example, the first data is received from a vehicle light sensor 10. This sensor measures the transparency of the vehicle's windshield. For example, the first data corresponds to a measured value of the windshield's brightness. In another example, the first data represents information indicating a decrease in brightness on the vehicle's windshield 10, characteristic of the presence of condensation.

[0055] In a second operation of the process, illustrated in [Fig.3], the display of a control button for the vehicle's defogging system is controlled in such a way that the button is displayed on the main display area 21 of the touch screen 12 according to a first graphic representation 320, the size of the control button according to the first graphic representation 320 being greater than a first determined threshold.

[0056] The control button is displayed in a determined content of a human-machine interface, called HMI, which content is displayed on the touch screen 12.

[0057] The first graphic representation 320 represents, for example, a windshield with several arrowed airflows.

[0058] The fact that the size of the control button according to the first graphic representation 320 is greater than a first determined threshold allows a display easily visible to the driver on the touch screen 12, without diverting his attention.

[0059] A display control of graphic content or any graphic object (text, pictogram, icon, control button, indicator, etc.) includes a rendering of the graphic content or graphic object, such rendering corresponding to a set of operations performed by one or more processors on the pixels of one or more images of the graphic content to be displayed on the touch screen 12. For example, the rendering consists of associating to a set of pixels of an image pixel data (for example color data expressed in an RGB (Red, Green, Blue) type space) associated with each graphic object.

[0060] The display control of the control button according to the first graphical representation thus includes the transmission of control signals to the touch screen 12 to modify the values ​​associated with the pixels of the touch screen 12 at the location intended to display the control button according to the first graphical representation 320 (or any graphical object).

[0061] According to one embodiment, the first threshold represents a ratio between the size of the control button according to the first graphic representation 320 and the total size of the main display area 21 of the touch screen 12. This ratio is expressed as a percentage of the total size of the main display area 21 occupied by the control button according to the first graphic representation 320.

[0062] According to one particular embodiment, the first threshold is equal to 90%. Thus, the control button will be displayed with a size greater than 90% of the size of the main display area 21, as illustrated in [Fig. 3]. A first threshold of 90% informs the driver of the urgent need to activate the defogging system, as visibility is reduced. Another advantage is that it allows the driver to press the control button without looking at the touchscreen 12, while keeping their eyes fixed on the road.

[0063] According to another particular embodiment, the first threshold is equal to 50%. Thus, the control button will be displayed with a size greater than 50% of the size of the main display area 21, as illustrated in Figures 4 and 5. For example, a first threshold of 50% makes it easier for the driver to touch the control button, while keeping a display area available on the main display area to show other information useful to the driver for ensuring control and supervision of the vehicle 10, for example, navigation information.

[0064] According to an embodiment illustrated by [Fig.4], the first graphic representation 420 occupies the left part of the main display area 21 of the screen 12, and the right part of the main display area of ​​the screen 12 is available to display other information.

[0065] According to an embodiment illustrated by [Fig.5], the first graphic representation 520 occupies the upper part of the main display area of ​​the screen 12, and the lower part of the main display area of ​​the screen 12 is available to display other information.

[0066] According to another embodiment, the first threshold represents dimensions in pixels of a height and a width of a minimum rectangular area on which to display the control button.

[0067] According to one embodiment, the first threshold is configurable via a vehicle HMI (Human-Machine Interface) 10. For example, the first threshold is configurable by selecting its value from a menu or page of the HMI. The driver selects the first threshold according to their preferences, for example, a high first threshold if the driver wants to make pressing the control button easier, as shown in the first graphic representation 320, 420, or 520.

[0068] In a third operation of the process, second data representing a touch press on the control button displayed according to the first graphic representation 320, 420 or 520 are received, following a touch press by a user (for example the driver of the vehicle 10) on the control button displayed on the touch screen 12.

[0069] A touch press on the control button displayed according to the first graphic representation 320, 420 or 520 sends information to the IVI computer so that the latter implements one or more functions associated with the command corresponding to the touch press.

[0070] The second data representing the touch press are received for example via one or more data buses linking the touch interface of the screen (or a computer controlling such a touch interface where applicable) and the IVI computer.

[0071] A touch press corresponds to a short or brief touch press in which the duration of the press on the control button is less than a threshold duration (for example, equal to 500 or 1000 ms). According to one embodiment, a touch press corresponds to a long touch press in which the duration of the press on the control button is greater than the threshold duration (for example, equal to 500 or 1000 ms).

[0072] In a fourth operation of the process, the IVI computer transmits third data representing a command or request to activate the front windshield defogging system to the system controller of front windshield defogging, the transmission of the third data being triggered by the reception of the first data by the IVI computer.

[0073] These third data are for example transmitted via one or more data buses linking the IVI computer and a control computer (called controller) of the demisting system.

[0074] The activation command or request activates the front windshield defogging system and triggers the projection of hot air onto the front windshield of vehicle 10. The fog present on the front windshield is thus eliminated.

[0075] According to one embodiment, the display time of the control button according to the first graphic representation 320, 420, or 520 on the main display area of ​​the touchscreen 12 is a fixed duration. For example, the display time of the control button according to the first graphic representation 320, 420, or 520 on the main display area 21 of the touchscreen 12 is 10, 15, or 20 seconds. The driver thus has a period of time to decide whether to press the control button, for example, if the vehicle 10 is currently in a turn requiring the driver to control the steering wheel with both hands, and therefore a delay between the appearance of the control button according to the first graphic representation 320, 420, or 520 and the driver's opportunity to press it.

[0076] According to another example, the display time of the control button according to the first graphic representation 320, 420 or 520 on the main display area 21 of the touch screen 12 depends on the initial data. For example, the display time is longer if the initial data indicates an amount of condensation causing very low visibility (below a predetermined threshold) on the front windshield of the vehicle 10.

[0077] According to one embodiment of the present invention, the control button shown in the first graphic representation 320, 420, or 520 on the main display area 21 of the touchscreen 12 disappears upon receipt of the second data. This second data indicates that a touch has been detected on the control button, and it is therefore no longer necessary to display this control button shown in the first graphic representation 320, 420, or 520. In other words, the reception of the second data also triggers a check to end the display of the control button shown in the first graphic representation 320, 420, or 520, the content displayed on the touchscreen then corresponding to the content displayed before the control button shown in the first graphic representation 320, 420, or 520.

[0078] According to one embodiment, the process further comprises a display control operation for the defogging system control button on the touchscreen according to a second graphical representation 220, the size of the button according to the second graphical representation 220 being less than a second threshold, the second threshold being lower than the first threshold. This embodiment makes it possible to keep a reduced-size control button available on the touchscreen 12, for example when the control button according to the first graphic representation 320, 420 or 520 disappears from the touchscreen 12.

[0079] According to one embodiment, the display of the control button according to the second graphic representation 220 is carried out on a secondary display area 22 of the touch screen 12.

[0080] The secondary display area 22 corresponds for example to a lower band of the touch screen 12, representing one or more control buttons commanding the activation of one or more systems of the vehicle 10, one of these control buttons being the control button of the front windshield defogging system 10 according to the second graphic representation 220.

[0081] Figure 6 schematically illustrates a device 6 configured for controlling a vehicle display system and / or for controlling a vehicle's front windshield defogging system, for example, vehicle 10, according to specific and non-limiting embodiments of the present invention. The device 6 corresponds, for example, to a device embedded in the vehicle 10, such as a computer.

[0082] Device 6 is, for example, configured to carry out the operations described opposite Figures 1 to 5 and / or the steps of the process described opposite [Fig. 7]. Examples of such a device 6 include, but are not limited to, embedded electronic equipment such as a vehicle's on-board computer, an electronic control unit such as an ECU (Electronic Control Unit), a smartphone, a tablet, or a laptop computer. The elements of device 6, individually or in combination, can be integrated into a single integrated circuit, into several integrated circuits, and / or into discrete components. Device 6 can be implemented in the form of electronic circuits or software (or computer) modules, or a combination of electronic circuits and software modules.

[0083] The device 6 comprises one (or more) processor(s) 60 configured to execute instructions for carrying out the steps of the process and / or for executing instructions from the software embedded in the device 6. The processor 60 may include integrated memory, an input / output interface, and various circuits known to those skilled in the art. The device 6 further comprises at least one memory 61, corresponding, for example, to volatile and / or non-volatile memory, and / or includes a memory storage device that may include volatile and / or non-volatile memory, such as EEPROM, ROM, PROM, RAM, DRAM, SRAM, flash, magnetic disk, or optical disk.

[0084] The computer code of the embedded software(s) including the instructions to be loaded and executed by the processor is for example stored on memory 61.

[0085] According to various particular and non-limiting embodiments, the device 6 is coupled in communication with other similar devices or systems and / or with communication devices, for example a TCU (Telematic Control Unit), for example via a communication bus or through dedicated input / output ports.

[0086] According to a particular and non-limiting embodiment, the device 6 includes a block 62 of interface elements for communicating with external devices. The interface elements of the block 62 include one or more of the following interfaces: - radio frequency RF interface, for example of the Wi-Fi® type (according to IEEE 802.11), for example in the 2.4 or 5 GHz frequency bands, or of the Bluetooth® type (according to IEEE 802.15.1), in the 2.4 GHz frequency band, or of the 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", or in French "Réseau interconnecté local").

[0087] According to another particular and non-limiting embodiment, the device 6 includes a communication interface 63 which allows communication to be established with other devices (such as other computers in the embedded system) via a communication channel 630. The communication interface 63 corresponds, for example, to a transmitter configured to transmit and receive information and / or data via the communication channel 630. The communication interface 63 corresponds, for example, to a wired network of the CAN (Controller Area Network), CAN FD (Controller Area Network Flexible Data-Rate), FlexRay (standardized by ISO 17458) or Ethernet (standardized by ISO / IEC 802-3) type.

[0088] According to a particular and non-limiting embodiment, the device 6 can provide output signals to one or more external devices, such as a display screen 640, touch or not, one or more speakers 650 and / or other peripherals 660 (projection system) via output interfaces 64, 65 and 66 respectively. In one variant, one or more of the external devices is integrated into device 6.

[0089] Figure 7 illustrates a flowchart of the different steps in a method for controlling a windshield defogging system of a vehicle, for example vehicle 10, according to a particular and non-limiting embodiment of the present invention. The method is implemented, for example, by a device installed in vehicle 10 or by device 6 of Figure 6.

[0090] In a first step 71, initial data representative of the detection of the presence of condensation on the front windshield of the vehicle are received.

[0091] In a second step 72, the display of a control button for said defogging system is controlled to display this button on a main display area of ​​the touch screen according to a first graphical representation based on the first data, a size of the button according to the first graphical representation being greater than a first determined threshold.

[0092] In a third step 73, second data representing a touch press on the control button are received.

[0093] In a fourth step 74, third data representing an activation command for the front windshield defogging system are transmitted to a controller of the front windshield defogging system, the transmission of the third data being triggered by the reception of the second data.

[0094] According to one variant, the variants and examples of the operations described in relation to one of Figures 1 to 5 apply to the steps of the process in [Fig.7].

[0095] Of course, the present invention is not limited to the embodiments described above but extends to a method for displaying a button representing the front windshield defogging system of a vehicle according to various graphic representations, which would include secondary steps without departing from the scope of the present invention. The same would apply to a device configured for implementing such a method.

[0096] The present invention also relates to a vehicle, for example an automobile or more generally a land motor vehicle, comprising the device 6 of [Fig.6] or a display system comprising the device 6 of [Fig.6] connected in communication to a touch screen 12.

Claims

Demands

1. A method for controlling a front windshield defogging system of a vehicle (10), said vehicle (10) having a display system including a touchscreen (12), said method being implemented by a processor and comprising the following steps: - receiving (71) first data representing the detection of the presence of fog on said front windshield of said vehicle - display control (72) of a control button of said defogging system on a main display area (21) of said touchscreen (12) according to a first graphical representation (320) as a function of said first data, a size of said control button according to said first graphical representation being greater than a first determined threshold, - receiving (73) second data representing a touch press on said control button,- transmission (74) of third data representing an activation command for said front windshield demisting system to a controller of said front windshield demisting system, said transmission being triggered by the reception of said second data.

2. Method according to claim 1, wherein said first threshold represents a ratio between said size of said control button and a total size of said main display area of ​​said touch screen (12).

3. Method according to claim 2, wherein said first threshold is equal to 90%.

4. Method according to claim 2, wherein said first threshold is equal to 50%.

5. A method according to any one of claims 1 to 4, wherein said first threshold is configurable via an HMI (Human-Machine Interface) of said vehicle (10).

6. A method according to any one of the preceding claims, further comprising a display control step for said control button of said defogging system on said touch screen according to a second graphical representation (220), a size of said control button according to said second graphical representation (220) being less than a second threshold, said second threshold being less than the first threshold.

7. Method according to claim 6, wherein the display of said control button according to said second graphic representation (220) is carried out on a secondary display area (22) of said touch screen (12).

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

9. Control device for a front windshield demisting system of a vehicle (10), said control device comprising a memory associated with at least one processor configured for carrying out the steps of the method according to any one of claims 1 to 7.

10. Vehicle (10) comprising a device according to claim 9.

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