INTERFACE FOR MOTOR VEHICLE AND CONTROL PROCESS

Description

[0001] The present invention relates to an interface for controlling at least one function of a motor vehicle component. The invention also relates to a method for controlling at least one function of a motor vehicle component by means of such an interface.

[0002] In the automotive field, the control of electrical components, such as the air conditioning or navigation system, is generally carried out by means of a mechanical rotary knob. This generally comprises a thumbwheel whose angular position is determined, for example, by an optical sensor or an electrical rotary switch. The angular position of the thumbwheel allows a processing unit to select a particular command and to control, for example, a flap actuator in the air conditioning system or allows the user to access the input keyboard to enter a destination in the navigation system.

[0003] A control system is also known in which a rotary wheel is combined with a touch screen, see for example FR3033422A1.

[0004] In this system, a capacitive touchscreen detects the angular position of a metal index finger carried by the wheel. The capacitive touchscreen thus allows, on the one hand, the tactile entry of information on the panel and, on the other hand, to detect the angular position of the wheel mounted rotatably on the panel. This system is interesting because it allows in particular to program the display of the touchscreen supporting the wheel in relation to different functions to be controlled. For example, the screen can be programmed to display the position of the shutters and the temperature of the air conditioning system. This same screen with wheel can also be used to display the parameter settings of the vehicle's audio system.

[0005] Rotating the wheel allows the user to scroll through an item in a list or to increment / decrement a variable, and the selection can be displayed on the screen. Once the item is selected or the value of the variable is modified, the choice can then be validated by touching the touch screen.

[0006] A disadvantage of this system is that it does not allow the validation of a command after its selection by simply pressing the wheel. However, pressing the wheel to validate a command is a generally intuitive operation for the user, which is usually associated with mechanical command wheels.

[0007] Another disadvantage of this system is that it can take time for the capacitive touchscreen to detect the metal index finger.

[0008] Another disadvantage is that the metal index finger may not be well seen by the capacitive touchscreen due to the air gap between the index finger and the touchscreen which may be of greater or lesser size due to manufacturing differences between the interfaces or in the case of touchscreens with curved surfaces.

[0009] One of the aims of the present invention is therefore to propose an improved interface which at least partially resolves at least one of these drawbacks.

[0010] To this end, the invention relates to an interface for controlling at least one function of a motor vehicle component, comprising: at least one control member comprising: a mobile gripping element, at least one metal index carried by the mobile gripping element and movable therewith, a guide, the mobile gripping element being supported and guided in movement by the guide, and a capacitive touch screen configured to detect the position of the metal index, the guide being fixed to the capacitive touch screen, the metal index being arranged opposite the capacitive touch screen, characterized in that the interface comprises at least one pressure sensor configured to measure a parameter representative of a pressure force exerted on the capacitive touch screen.

[0011] The detection of a pressure force exerted on the capacitive touch screen makes it possible in particular to detect pressure exerted on the control member.

[0012] The interface is thus capable of measuring a pressing force exerted on the control member which is transmitted to the capacitive touch screen by the control member. The pressing sensors capable of measuring when a pressing force is exerted on the capacitive touch screen thus also make it possible to measure when a pressing force is exerted on the control member. A single pressing force measuring device is thus used to measure both when pressure is exerted on the control member or on the capacitive touch screen.

[0013] It is then possible to execute a function, such as validation after a selection, by simply pressing the user on the control unit.

[0014] Depending on one or more characteristics of the interface, taken alone or in combination: the interface comprises a fixed part and at least one damping element arranged between the fixed part and a movable part of the interface comprising the capacitive touch screen, the support sensor is a capacitive sensor configured to measure a displacement of the movable part relative to the fixed part, the capacitive touch screen comprises a front plate on which the guide of the control member is fixed, the capacitive touch screen comprises a capacitive sensor fixed under the front plate, on the side opposite the guide, the interface comprises at least two support sensors arranged on either side of the capacitive sensor under the front plate, the support sensors are configured to measure a displacement of a support of the movable part carrying the front plate relative to a base of the fixed part, the interface comprises as many support sensors as damping elements, each support sensor is arranged near a respective damping element,the interface comprises a display screen configured to display information associated with a contact, a movement or a pressure of the movable gripping part or with a contact or a pressure on the capacitive touch screen, the display screen is fixed to the capacitive touch screen, the capacitive touch screen is at least partially transparent, the pressure sensor is arranged at the rear of the display screen, the pressure sensor is carried by an electronic card of the interface also carrying electronic circuits for managing the display screen, the support extends between the display screen fixed to the capacitive touch screen and the base carrying the pressure sensor so that a pressure on the capacitive touch screen brings the pressure sensor closer to the support, the support extends between the pressure sensor and the base,the support sensor being fixed to the base by studs passing through the support so that pressing on the capacitive touch screen moves the support sensor away from the support, the interface comprises at least one vibratory actuator configured to vibrate at least the capacitive touch screen in response to contact, movement or pressing of the mobile gripping element or to contact or pressing on the capacitive touch screen, the interface comprises a mechanical bearing interposed between a base of the guide and the mobile gripping element, the mechanical bearing is a ball bearing, a cylinder bearing or a needle bearing, the mechanical bearing comprises a seal, the control member comprises at least one metallic elastic member of which a first end is connected to an external metallic surface of the mobile gripping element and a second end is fixed to the metallic index,the metallic elastic member being configured to urge the metallic index finger against the capacitive touch screen, the mobile gripping element is rotatable, the mobile gripping element comprises at least one light guide having a first end located opposite the capacitive touch screen and a second end located at an end of the mobile gripping element opposite that located opposite the capacitive touch screen, the light guide is configured so that its side walls reflect the light at least once, the side walls of the light guide are polished, the surface of the second end of the light guide is translucent, for example frosted, the light guide is made of at least partially transparent and / or at least partially translucent material, the light guide is made of plastic material, the light guide has at least a first cylindrical portion,the cylindrical portion is surmounted by a second portion of revolution of flared shape, the first end and / or the second end of the light guide has an annular shape, the second end of the light guide emerges from the control member to be visible to the user, the second end is arranged opposite a display area formed in an opaque front face of the control member, the display area defining at least one pictogram which can be backlit by the second end of the light guide, the shape of the second end of the light guide has at least one annular concave portion, the surface of the second end of the light guide is larger than the surface of the first end, the height of the light guide is at least twice the surface of the first end of the light guide located opposite the capacitive touch screen,the mobile gripping element comprises a peripheral gripping part carrying a first metal index, the mobile gripping element comprises a central gripping part carrying a second metal index, the peripheral gripping part and the central gripping part comprise metal bodies forming the external metal surfaces, the light guide is interposed between the central gripping part and the peripheral gripping part, the light guide forms an electrical insulator, the light guide surrounds the central gripping part, the display screen is configured to emit light at the first end of the light guide, the control member comprises at least one second metal index that can be detected by the capacitive touch screen,the second metal index is carried by the movable gripping element and connected to a second external metal surface of the movable gripping element, a first metal index is eccentric relative to the axis of rotation so as to detect an angular position of the movable gripping element, the second metal index and / or the second metal gripping surface is arranged in the axis of rotation to detect a central contact of the movable gripping element, the movable gripping element comprises a peripheral gripping part carrying the first metal index and the first external metal surface, the movable gripping element comprises a central gripping part carrying the second metal index and the second external metal surface, the movable gripping element comprises an electrical insulator interposed between the central gripping part and the peripheral gripping part,the electrical insulator surrounds the central gripping part, the electrical insulator is at least partially transparent and / or at least partially translucent, the electrical insulator has a first end located opposite the capacitive touch screen and a second end located at one end of the mobile gripping element opposite that located opposite the capacitive touch screen.

[0015] The invention also relates to a method for controlling at least one function of a motor vehicle component by means of an interface as described previously, in which at least one function of the interface is controlled when a pressing force greater than a threshold is exerted on the capacitive touch screen.

[0016] The interface display screen and / or the control member can be illuminated when a pressing force exerted on the capacitive touch screen is greater than a wake-up threshold, such as of the order of 0.1N.

[0017] A function of the interface can be controlled when a pressure force exerted on the capacitive touch screen is greater than a pressure threshold, such as around 3N.

[0018] A function of the interface can be controlled relative to the intensity of the pressing force exerted on the capacitive touch screen.

[0019] At least one function of the interface can be controlled when the capacitive touch screen detects contact from the movable gripping part of the control member and when a pressing force greater than a pressing threshold is exerted on the capacitive touch screen.

[0020] At least one parameter of the generated vibration can be controlled relative to the intensity of the pressure force exerted on the capacitive touch screen.

[0021] According to an example of the control method, a first pressing force detection threshold is associated with the detection of a first metal index and a second pressing force detection threshold is associated with the detection of a second metal index.

[0022] The first detection threshold may be distinct from the second detection threshold.

[0023] For example, a first pressure force detection threshold is associated with a contact detected by means of a metal index carried by a peripheral gripping part and a second pressure force detection threshold is associated with a contact detected by means of a metal index carried by a central gripping part, the first detection threshold being greater than the second detection threshold.

[0024] Another object of the invention is an interface for controlling at least one function of a motor vehicle component, comprising: at least one control member comprising: a mobile gripping element, at least one metal index carried by the mobile gripping element and movable therewith, a guide, the mobile gripping element being supported and guided in movement by the guide, and a capacitive touch screen configured to detect the position of the metal index, the guide being fixed to the capacitive touch screen, the metal index being arranged opposite the capacitive touch screen, characterized in that the control member comprises at least one elastic metal member, a first end of which is connected to an external metal surface of the mobile gripping element and a second end is fixed to the metal index, the elastic metal member being configured to urge the metal index against the capacitive touch screen.

[0025] By pressing the metal index finger against the capacitive touch screen, contact is ensured between the metal index finger and the screen. The metal index finger can thus be seen by the screen, regardless of manufacturing tolerances or non-flatness of the screen. In addition, the elastic metal member is conductive, which ensures the transfer of charge between the metal index finger and the external metal surface of the mobile gripping element.

[0026] Other characteristics and advantages of the invention will emerge from the following description, given by way of example and without limitation, with reference to the appended drawings in which: there figure 1 represents a view of a portion of the interior passenger compartment of a motor vehicle comprising an interface which is installed, for example, at the front panel of the vehicle, the figure 2 shows a front view of the interface of the figure 1 , there figure 3 shows an AA sectional view of the interface of the figure 2 , there figure 4 shows an exploded view of a control unit of the interface of the figure 3 , there figure 5 shows a flowchart of a method for controlling at least one function of a motor vehicle component by means of the interface of the figures 2 And 3 , there figure 6 is a schematic view of a first configuration of the interface, the figure 7 is a schematic view of a second configuration of the interface, the figure 8 is a schematic view of a third configuration of the interface, the figure 9 is a schematic view of a fourth configuration of the interface, and the figure 10 is a schematic view of another example interface.

[0027] In these figures, identical elements have the same reference numbers.

[0028] There figure 1 shows elements of a front part of a motor vehicle passenger compartment.

[0029] The passenger compartment includes in particular a driver's seat marked -C- arranged behind a steering wheel 60 and a front panel 61 (also called dashboard), a passenger seat marked -P-, an interior rearview mirror 62, a ceiling light module 63 also called a dome placed near the interior rearview mirror 62 in the upper central part of the front part of the passenger compartment and a central console 64 located between the two seats C, P of the front part of the passenger compartment 10.

[0030] The passenger compartment includes an interface 1, in particular suitable for being housed in the front panel 61 of the vehicle. Of course, the interface 1 can also be arranged in other locations in the passenger compartment, such as for example at the central console 64 or any other suitable location.

[0031] Such an interface 1 allows the control of at least one function of a motor vehicle component such as the control of the functions of an air conditioning system, an audio system, a telephone system or a navigation system. This interface 1 can also be used for window regulator controls, positioning of exterior rearview mirrors or for moving motorized seats or for controlling interior lights, central locking, a sunroof, hazard lights or ambient lights.

[0032] Interface 1 allows the user, for example, to scroll through a list, change a parameter value, or confirm a selection. For example, it allows the user to select a destination postal address or a name from a directory, the settings for the air conditioning system, or select a music track from a list.

[0033] The interface 1 comprises at least one control member 2, a capacitive touch screen 3 and at least one pressure sensor 11.

[0034] THE figures 2 And 3 show a more detailed view of interface 1, the figure 3 representing interface 1 of the figure 2 in AA section.

[0035] The capacitive touch screen 3 comprises at least one capacitive sensor 31 and a front plate 32 arranged on the capacitive sensor 31. The capacitive sensor 31 is fixed to the front plate 32 for example by an optical glue (called “optical bounding” in English).

[0036] The capacitive sensor 31 makes it possible to detect a variation in capacitance at the surface of the front plate 32. The capacitive sensor 31 can, for example, detect contact from a user's finger. The capacitive sensor 31 also makes it possible to determine the spatial coordinates of the finger on the surface of the panel 3. The capacitive sensor 31 is, for example, formed from an array of electrodes extending over all or part of the rear surface of the front plate 32. The electrodes are, for example, made of ITO (indium tin oxide), which allows the sensor 31 to be transparent.

[0037] The rigidity of the capacitive touch screen 3 is obtained by means of the rigid front plate 32 (or contact plate), such as a glass or plastic plate. The front plate 32 arranged on the capacitive sensor 31 faces the user once mounted in the passenger compartment. The touch surface of the screen 3 is thus formed by the surface of the front plate 32 which can be flat or curved.

[0038] The front plate 32 may be at least partially transparent and / or at least partially opaque so as to conceal the elements arranged behind it.

[0039] The front plate 32 can be entirely opaque, the capacitive touch screen 3 forming a touchpad. Such an interface 1 having a control member 2 glued to the capacitive touch screen 3 is compact. Indeed, such an interface 1 combines two elements that can be manipulated by the user in the same location in the passenger compartment without requiring a dedicated location for fixing the control member 2. This also makes it possible to have a reconfigurable interface 1. Entering characters is tedious with a wheel, or even impossible for Asian characters. The control member 2 glued to a screen 3 makes it possible to obtain in a small space a multifunctional interface 1 capable of performing easy character recognition thanks to the screen, combined with the comfort of gripping a control member 2.

[0040] A display screen 10, such as a TFT screen (Thin-Film Transistor) or an LED screen or an LCD screen, may be configured to display information associated with the manipulation of the interface 1. The screen 10 may be arranged under the capacitive sensor 31 so as to form a touch screen. The display screen 10 may be fixed to the capacitive sensor 31 by an optical glue 33 (called optical bounding). The capacitive sensor 31, the optical glue 33 and the front plate 32 are then at least partially transparent to allow viewing of the images displayed through the screen 10.

[0041] The interface 1 may comprise an electronic card 21 carrying electronic circuits for managing the display screen 10.

[0042] The display screen 10 can also be remote from the capacitive touch screen 3. The front plate 32 is then opaque. The remote display screen 10 can be received in the front panel 61 or can be projected into the driver's field of vision by a head-up display, also known as HUD (for "Head-Up Display" in English).

[0043] The capacitive touch screen 3 and the display screen 10 are, for example, elements of a mobile part 16 of the interface 1 which is connected by at least one damping element 17 to a fixed part 18 intended to be fixed to the motor vehicle. The damping element 17 comprises at least one elastic element, such as an elastic, silicone or rubber pad. The damping element 17 comprises, for example, at least four silentblocks ®< comprising elastic elements and fixing screws for connecting the mobile part 16 to the fixed part 18.

[0044] The pressure sensor 11 is configured to measure a parameter representative of a pressure force exerted on the capacitive touch screen 3.

[0045] The interface 1 comprises, for example, as many support sensors 11 as there are damping elements 17, for example four support sensors 11, arranged near a respective damping element 17. A sensor 11 is, for example, arranged near each corner of the display screen 10 ( figure 2 ).

[0046] The support sensor 11 is for example a capacitive sensor configured to measure a distance between the mobile part 16 and the fixed part 18 in a direction perpendicular to the surface of the slab 3. A variation in distance between the mobile part 16 and the fixed part 18 is representative of a movement of the mobile part 16 relative to the fixed part 18 due to support on the slab 3.

[0047] For this, the support sensor 11 comprises an electrode, for example carried by an additional electronic card 11a, arranged opposite a metal surface, one being carried by the mobile part 16, the other being carried by the fixed part 18. The measurement of the support force can then be obtained from a capacitive measurement of the small displacement of the slab 3 (not perceptible) resulting from a support exerted on the slab 3.

[0048] The movable part 16 comprises for example a support 19 to which the capacitive touch screen 3 and the at least one damping element 17 are fixed. More precisely, the capacitive sensor 31 of the screen 3 is fixed to the rear of the front plate 32, a guide 5 of the control member 2 being fixed on the front face. It is further provided that the dimension of the surface of the front plate 32 is greater than that of the capacitive sensor 31. The support 19, for example in the form of a frame, is fixed at the level of the surface left free of the front plate 32, at the rear of the latter, around the capacitive sensor 31 of the screen 3.

[0049] According to a first example of realization represented on the figure 3 , the interface 1 comprises at least two support sensors 11, for example four, arranged on either side of the capacitive sensor 31, and here of the display screen 10. The support sensors 11 are configured to measure a movement of the support 19 relative to a base 20 of the fixed part 18. The support 19 is for example metallic or has a metallic coating on the rear face, at least opposite the electrode of the support sensor 11 carried by an additional electronic card 11a fixed to the base 20. These metallic surfaces can be detected by the electrode of the support sensor 11. The support sensors 11 are thus arranged opposite the support 19, itself fixed to a portion P of the front plate 32 which is opaque ( figure 2 ), they are therefore not visible to the user.

[0050] The support sensors 11 arranged near the damping elements 17 are arranged at the location where the movement of the moving part 16 is greatest.

[0051] In operation, when the user presses on the front plate 32 or on the control member 2, the pressure sensor 11 detects the movement of the capacitive touch screen 3 towards the fixed part 18, representative of a pressure force.

[0052] The measurement of the support force can also be carried out by other means such as inductive measurement or ultrasonic measurement or by deformation measurement using strain gauges or FSR sensors (for "Force Sensing Resistor" in English).

[0053] A processing unit 12 can be connected to the support sensors 11 and to the capacitive sensor 31 ( figure 2 ). The processing unit 12 comprises one or more microcontrollers or computers, having memories and programs adapted to modify the display of the screen 10, to receive the position information detected by the capacitive touch screen 3 and to receive the measurement signals from the sensors 11. This is for example the on-board computer of the motor vehicle. The processing unit 12 can be configured to evaluate a pressing force from the pressing sensors 11 in particular by adding the forces measured by each sensor 11.

[0054] An example of control organ 2 is also visible in the sectional view of the figure 3 and on the exploded view of the figure 4 .

[0055] It can be seen in these figures that the control member 2 comprises a mobile gripping element 4, at least one metal index 6a, 6b carried by the mobile gripping element 4 and movable with it and a guide 5, the mobile gripping element 4 being supported and guided in movement by the guide 5.

[0056] The guide 5 is fixed to the front plate 32 of the capacitive touch screen 3, for example by gluing. The guide 5 is for example fixed to the center of the capacitive touch screen 3 ( figure 1 ) or in a corner or side of the capacitive touchscreen 3.

[0057] The control member 2 is for example a rotary button, the movable gripping element 4 then being movable in rotation about an axis of rotation I perpendicular to the surface of the capacitive touch screen 3. The rotating movable gripping element 4 is supported and guided in rotation by the guide 5 forming a bearing. The movable gripping element 4 and the guide 5 have for example coaxial cylindrical general shapes.

[0058] According to an exemplary embodiment, the guide 5 comprises a base 51 fixed to the capacitive touch screen 3 and a mechanical bearing 52, such as a ball bearing or a cylinder bearing or a needle bearing, mounted on the base 51, the mechanical bearing 52 being interposed between the base 51 and the mobile gripping element 4.

[0059] The mechanical bearing 52 limits friction and ensures good rotational guidance of the mobile gripping element 4. The reduction in friction allows good longevity of the control member 2 and limits noise. The good rotational guidance produces a quality feel for the user, allowing smooth and easy navigation through the various menus.

[0060] The good rotational guidance also makes it possible to prevent the mobile gripping element 4 from positioning itself crookedly during rotation, which could jam the metal indexes 6a, 6b.

[0061] Furthermore, the mechanical bearing 52 makes it possible to transmit a force exerted on the control member 2 to the capacitive touch screen 3 so that it can be detected by the support sensors 11. Also, the possibility of transmitting a force between the control member 2 and the screen 3 makes it possible for haptic feedback generated on the screen 3 to be transmitted to the user's fingers by the control member 2. Indeed, the mechanical bearing 52 makes it possible to form a rigid connection between the mobile gripping element 4 and the base 51 glued to the capacitive touch screen 3.

[0062] The mechanical bearing 52 may include a seal making it possible in particular to improve the maneuverability of the control member 2.

[0063] Other means of guiding the rotation of the guide 5 are conceivable, such as smooth bearings, such as self-lubricating bushings or rings or such as balls elastically stressed against the mobile gripping element 4.

[0064] The end of the mobile gripping element 4 opposite the capacitive touch screen 3 carries at least one metal index 6a, 6b which is thus arranged opposite the capacitive touch screen 3. This is for example a metal tab, for example made of copper.

[0065] The metal index 6a, 6b is electrically connected to an external metal surface 9a, 9b of the mobile gripping element 4 intended to be manipulated by the user. The external metal surface 9a, 9b at least partially covers the external surface of the mobile gripping element 4.

[0066] For this purpose, the movable gripping element 4 is, for example, at least partly made of metallic material.

[0067] According to another example, the movable gripping element 4 comprises a coating arranged at the level of the external gripping surface, such as a chrome-plated envelope connected to the metal index 6a, 6b.

[0068] By touching the external metal surface 9a, 9b electrically connected to the metal index 6a, 6b, the user brings electrical charges opposite the capacitive touch screen 3 which are then detected by the capacitive sensor 31. The detection of these charges in the area of the control member 2 makes it possible to deduce the contact of the control member 2 by the user. The determination of the coordinates of the metal index 6b by the capacitive touch screen 3 also makes it possible to determine the angular position of the movable metal index 6b above the capacitive touch screen 3.

[0069] The interface 1 is further configured to control the implementation of a control method 100 of at least one function of a motor vehicle component ( figure 5 ).

[0070] During this control method 100, at least one function of the interface 1 is controlled when a pressing force exerted on the capacitive touch screen 3 is greater than a threshold.

[0071] For example, the display screen 10 is illuminated and / or the control member 2 is backlit when a pressing force exerted on the capacitive touch screen 3 is greater than a wake-up threshold, for example when the pressing force is greater than 0.1N, such as between 0.1 and 0.15N. Indeed, the detection of a press on the control member 2 by the press sensors 11 can be faster than the detection by the capacitive touch screen 3 of a contact of the control member 2, due to the time required for the transport of the charges from the external metal surface to the metal index 6a, 6b. The detection of a press by the press sensors 11, prior to the detection of a contact by the screen 3, can therefore allow the “waking up” of the interface 1, by lighting up the screen 10 or by backlighting the control member 2.

[0072] For example, a function of the interface 1 is controlled, such as validation of a selection, when a pressing force exerted on the capacitive touch screen 3 is greater than a pressing threshold, for example when the pressing force is greater than 3N.

[0073] The function of the interface 1 can be controlled relative to the intensity of the pressing force exerted on the capacitive touch screen 3. For example, the function is an enlargement of the image displayed on the screen 10 and the enlargement is proportional to the intensity of the pressing force exerted on the screen 3.

[0074] It is further possible to control at least one function of the interface 1 when the capacitive touch screen 3 detects contact from the control member 2 and when a pressing force greater than a pressing threshold is exerted on the capacitive touch screen 3.

[0075] The measurement of a pressing force greater than the pressing threshold can make it possible to confirm the detection of a contact of the control member 2 by the capacitive touch screen 3 due to the redundancy of the information.

[0076] The detection of a contact of the mobile gripping element 4 and the measurement of a pressure on the control member 2 greater than a pressure threshold can in particular allow the validation of a function, such as a function of the air conditioning system, navigation, car radio or the validation of a selection of a choice from a list, such as a telephone list. It is thus in particular possible to execute a function, such as a validation of a selection, by simply pressing the control member 2.

[0077] The interface 1 may also comprise at least one vibratory actuator 13 configured to vibrate at least the capacitive touch screen 3 in response to a contact, a movement or a pressure of the mobile gripping element 4 or to a contact or a pressure exerted on the capacitive touch screen 3. The interface 1 comprises for example two vibratory actuators 13 for example fixed to the support 19 of the front plate 13 of the capacitive touch screen 3 ( figure 2 ).

[0078] The vibration actuators 13 may be arranged on either side of the screen 10, such as on the right and left or such as at the top and bottom of the screen 10 with reference to the vertical position of the interface 1 mounted in the vehicle ( figure 1 ).

[0079] The vibration actuators 13 may be mounted so as to direct the vibration in the plane of the screen 10 or orthogonally to the plane of the screen 10, or directed in a combination of these directions.

[0080] The possibility of vibrating the slab 3 makes it possible to vibrate the control member 2 fixed on the slab 3. In fact, the haptic feedback is not only done on the capacitive touch slab 3 but it is also transmitted to the user's hand through the control member 2 fixed on the slab 3. This is possible due to the good transmission of forces between the control member 2 and the actuator 13 which is obtained in particular by fixing the guide 5 by gluing on the slab 3 and by the use of a mechanical bearing 52.

[0081] This haptic feedback can, for example, make it possible to index the angular positions of the mobile gripping element 4.

[0082] At least one parameter of the generated vibration can be controlled relative to the intensity of the pressure force exerted on the capacitive touch screen 3.

[0083] The moving part 16, i.e. the capacitive touch screen 3 or the capacitive touch screen 3 and the screen 10, can also be vibrated when a pressing force exerted on the capacitive touch screen 3 greater than a threshold is measured.

[0084] Measuring the pressing force exerted on the capacitive touch screen 3 can also make it possible to control at least one parameter of the generated vibration, relative to the intensity of the pressing force exerted on the capacitive touch screen 3. The parameter of the vibration can be the shape of the power supply signal of the actuator 13, the amplitude, the duration or the frequency of the vibration.

[0085] This dependency is for example a proportional relationship or a mathematical law or can be predefined in a correspondence table previously stored in memory.

[0086] According to a particular example of realization visible on the figures 3 et 4 , as well as on the interface variant 1 shown in figure 10 , the control member 2 comprises at least one metallic elastic member 8a, 8b, such as a helical compression spring.

[0087] A first end of the metallic elastic member 8a, 8b is connected to an external metallic surface 9a of the movable gripping element 4 and a second end is fixed to the metallic index 6a, 6b.

[0088] The metallic elastic member 8a, 8b is configured to urge the metallic index 6a, 6b against the capacitive touch screen 3.

[0089] By urging the metal index 6a, 6b against the capacitive touch screen 3, contact is ensured between the metal index 6a, 6b and the screen 3. The metal index 6a, 6b can thus be seen by the screen 3, independently of manufacturing tolerances or the non-flatness of a curved front plate 32 for example and therefore of the gap that may exist between the screen and the index. In addition, the elastic metal member 8a, 8b is conductive, which makes it possible to ensure the transfer of charge between the metal index 6a, 6b and the external metal surface of the mobile gripping element 4.

[0090] According to a particular example of realization visible on the figures 3 et 4 , as well as on the interface variant 1 shown in figure 10 , the control member 2 comprises at least a first metal index 6a and at least a second metal index 6b. The first metal index 6a is connected to a first external metal surface 9a of the movable gripping element 4. The second metal index 6b is connected to a second external metal surface 9b of the movable gripping element 4. The first external metal surface 9a and the second external metal surface 9b are not electrically connected.

[0091] We can thus order at least: a first function of the interface 1 when the capacitive touch screen 3 detects a first metal index 6a, and a second function of the interface 1 when the capacitive touch screen 3 detects a second metal index 6b.

[0092] It is also possible to measure a pressing force exerted on the capacitive touch screen 3 by means of a pressing sensor 11, at least one pressing force detection threshold being associated with the detection of a metal index 6a, 6b.

[0093] For example, a first pressure force detection threshold is associated with the detection of the first metal index 6a and a second pressure force detection threshold is associated with the detection of the second metal index 6b.

[0094] The first threshold and the second detection threshold may be distinct or equal.

[0095] In the case of a rotating mobile gripping element 4, the first metal index 6a is for example eccentric relative to the axis of rotation I so as to detect an angular position of the mobile gripping element 4 when it is touched by the user.

[0096] According to an exemplary embodiment, the second metal index 6b and / or the second metal gripping surface 9b is arranged in the axis of rotation I to detect a central contact of the movable gripping element 4.

[0097] This results in a control member 2 having two distinct contact zones with a compact design.

[0098] According to another example, the second metal index 6b and / or the second metal gripping surface 9b is eccentric relative to the axis of rotation I. The information of a detection of the second metal index 6b can then be processed as a contact distinct from that detected by the first metal index 6a defining an angular position.

[0099] According to an exemplary embodiment, the mobile gripping element 4 comprises: a peripheral gripping portion 4a carrying the first metal index 6a and the first external metal surface 9a, and a central gripping portion 4b carrying the second metal index 6b and the second external metal surface 9b.

[0100] The peripheral gripping part 4a has for example a general ring shape. The central gripping part 4b, disassembled into two parts in the example of the figure 5 , for example has a general cylindrical shape, coaxial with the ring.

[0101] According to an embodiment variant shown in the figure 10 , the central gripping part 4b has a flared shape on the side of the end visible to the user.

[0102] The external metal surfaces 9a, 9b may be connected to a respective metal index 6a, 6b by electrical wires or metal rods (not shown).

[0103] According to another example, the peripheral gripping portion 4a and the central gripping portion 4b comprise metal bodies forming the external metal surfaces 9a, 9b.

[0104] The metallic elastic members 8a, 8b fixed on the one hand to a respective metallic index 6a, 6b, can be fixed on the other hand, to a respective metallic body of the peripheral and central gripping parts 4a, 4b to be connected to a respective external metallic surface 9a, 9b.

[0105] It can be provided that the mobile gripping element 4 further comprises a crown 14 of insulating material, such as plastic, interposed between the end of the metal body of the peripheral gripping part 4a and the metal index 6a ( figures 3 And 10). The crown 14 can be fixed to the end of the metal body, for example by means of fixing screws 15. The crown 14 of insulating material makes it possible to prevent the metal body from being detected by the capacitive touch screen 3 and distorting the measurements.

[0106] The movable gripping element 4 may comprise an electrical insulator 7 interposed between the central gripping part 4a and the peripheral gripping part 4b. The electrical insulator 7 makes it possible to isolate the metal indexes 6a, 6b from each other, in particular for a peripheral and central gripping part 4a, 4b comprising metal bodies. This makes it possible to separate the detection of a contact on the peripheral gripping part 4b from a contact on the central gripping part 4b.

[0107] The peripheral and central gripping parts 4a, 4b and the electrical insulator 7 may have complementary shapes. The peripheral and central gripping parts 4a, 4b are fixed to the electrical insulator 7, for example by gluing. The peripheral gripping part 4a, the central gripping part 4b and the electrical insulator 7 of the movable gripping element 4 are rotationally integral.

[0108] The electrical insulator 7 may surround the central gripping portion 4a, in particular over the height of the control member 2. More specifically, the electrical insulator 7 has, for example, a first cylindrical portion, in particular of the same height as the base 51, surmounted by a second portion of revolution of flared shape. The cylindrical portion of the electrical insulator 7 passes through the base 51 of the guide 5. The ends 7a, 7b of the electrical insulator 7 may have respective ring shapes.

[0109] It is thus possible to associate a distinct function depending on whether the user touches or presses on the periphery or on the top of the control member 2.

[0110] Rotation of the peripheral gripping part 4a can allow the selection of a function and successive pressing or contact of the peripheral gripping part 4a or of the central gripping part 4b can allow validation of the selection made.

[0111] Pressing or contacting the central gripping part 4b can allow validation without prior selection rotation.

[0112] Two distinct detection thresholds may be provided depending on whether the user presses on the peripheral gripping part 4a or on the central gripping part 4b. For example, the detection threshold of the peripheral gripping part 4a is higher than the detection threshold of the central gripping part 4b. A higher detection threshold in the peripheral part makes it possible to avoid triggering a command when the user manipulates the peripheral gripping part 4a in rotation to select a command for example.

[0113] The mobile gripping element 4 may comprise at least one light guide 7.

[0114] The light guide 7 has a first end 7a located opposite the capacitive touch screen 3 and a second end 7b located at one end of the mobile gripping element 4 opposite that located opposite the capacitive touch screen 3.

[0115] In the case where the capacitive touch screen 3 is at least partially transparent and the interface 1 comprises a display screen 10 arranged under the capacitive touch screen 3, the light source illuminating the first end 7a of the light guide may come from the display screen 10.

[0116] In the case in particular where the front plate 32 is opaque, the interface 1 may comprise a light source, such as an LED, located at the first end 7a of the light guide. The LED is for example fixed on the capacitive touch screen 3.

[0117] The light guide 7 is configured to reflect the light rays at least once, by reflection on its side walls or on diffusing particles of the light guide material.

[0118] The light guide 7 cannot transmit images coming directly from the screen 10. Indeed, unlike a simple window or a lens, the light guide 7 homogenizes the light coming from the screen 10 thanks to a succession of reflections so that the pixels of the screen 10 can no longer be seen through the light guide 7. The screen 10 is thus in fact used as a simple light source.

[0119] The light guide 7 is made of at least partially transparent and / or at least partially translucent material.

[0120] The material is, for example, 100% transparent or 90% transparent and 10% translucent, the proportions being chosen according to the desired effect. In the case of a fully transparent material, the reflections may occur on the side walls only. To increase the reflection rate, the side walls of the light guide 7 may be polished. In the case of a translucent material, the reflections may occur on scattering particles internal to the material.

[0121] The light guide 7 can be made of plastic material.

[0122] The surface of the second end 7b of the light guide 7 may be translucent, for example frosted. The translucent or frosted surface may be obtained for example by molding or by chemical etching, to obtain for example fine roughnesses which diffuse the light.

[0123] The height of the light guide 7 may be at least twice, such as at least three times, greater than the surface area of the first end 7a of the light guide 7 located facing the capacitive touch screen 3. This geometric criterion makes it possible to increase the reflection rate of the light rays on the side walls and therefore to obtain the effect of homogenizing the light of the light guide 7.

[0124] The light guide 7 may have at least one inclined portion, such as at least one bent portion. The light guide 7 shown in the figure 10 thus has two angled portions. The inclined portion allows the light rays to be deflected and therefore the light coming from the screen 10 to be homogenized.

[0125] The light guide 7 may have at least a first cylindrical portion. The cylindrical portion may be topped with a second portion of revolution of flared shape ( figures 3, 4 And 10 ).

[0126] In the example of realization of the figure 3 , the light guide 7 has a second portion of conical revolution and a cylindrical internal shape. The thickness of the light guide 7 thus has a greater dimension on the side of the visible end of the control member 2. The surface of the second end 7b is larger than the surface of the first end 7a.

[0127] In the example of realization of the figure 10 , the light guide 7 has a substantially funnel-shaped external shape and a constant thickness of the light guide 7. The surface of the second end 7b has the same dimension as the surface of the first end 7a.

[0128] The light guide 7 may surround the central gripping portion 4a. The peripheral and central gripping portions 4a, 4b and the light guide 7 may have complementary shapes. The peripheral and central gripping portions 4a, 4b are fixed to the light guide 7, for example by gluing. The peripheral gripping portion 4a, the central gripping portion 4b and the light guide 7 of the movable gripping element 4 are rotationally integral.

[0129] The first end 7a and / or the second end 7b of the light guide 7 has, for example, an annular shape.

[0130] The second end 7b of the light guide 7 can emerge from the control member 2 to be visible to the user.

[0131] The second end 7b can form a luminous ring or “haloring” in English, visible on the surface of the control member 2.

[0132] According to another example, the second end 7b forms a light indicator, visible on the surface of the control member 2. The second end 7b thus has, for example, the shape of a pictogram or symbol such as an arrow or has the shape of a disc or a polygonal shape, such as a rectangle.

[0133] The indicator light or light ring is used to signal the position of the control member 2 to the user, particularly when driving at night.

[0134] The surfacing of the second end 7b visible to a user may be non-planar. It may be defined by “Freeform” technology. The surface of the second end 7b then has, for example, at least one concave portion, in particular annular ( figures 3 et 4 ). A “freeform” surface can thus have several radii of curvature and / or concavities with different orientations, which allows, among other things, the control member 2 to be stylized.

[0135] According to another exemplary embodiment, the second end 7b is arranged opposite a display area provided in an opaque front face of the control member 2. The display area is for example a translucent area. The display area defines at least one pictogram that can be backlit by the second end 7b of the light guide 7.

[0136] The mobile gripping element 4 may comprise one or more light guides 7. The mobile gripping element 4 comprises, for example, several independent light guides 7 forming a tubular shape or backlighting a respective pictogram.

[0137] The electrical insulator 7 can further form the light guide and vice versa. A single element referenced 7 thus designates the light guide and the electrical insulator on the figures 3, 5 And 10 .

[0138] The processing unit 12 can be configured to modify the lighting of the display screen 10 or of the light source as a function of a contact or a movement of the mobile gripping element 4 or when a pressure, which can be associated with a contact of the control member 2, is detected by the pressure sensor 11.

[0139] The screen 10 thus provides a wide range of colors and great programming flexibility for backlighting or illuminating the control member 2. The colors can thus, for example, scroll sequentially, continuously or flashing.

[0140] The light guide 7 thus makes it possible to backlight or illuminate the control member 2, for example in association with the detection of a contact of the control member 2 or when the mobile gripping element 4 is moved or when pressure is detected on the control member 2.

[0141] We will now describe for illustration, two examples of operation of interface 1.

[0142] According to a first example of operation, the user begins by touching the peripheral gripping part 4a of the control member 2. The electrical charges are conducted by the external metal surface 9a of the movable gripping element 4 towards the first metal index 6a. The capacitive touch screen 3 detects these charges in the area of the screen 3 where the control member 2 is arranged (step 101, figure 5 ), which makes it possible to deduce a contact of the control organ 2 by the user.

[0143] The user can manipulate the peripheral gripping part 4b in rotation to select a command which is displayed on the display screen 10. More precisely, the coordinates of the movement of the first metal index 6a indicate to the processing unit 12 the angular positioning of the peripheral gripping part 4b of the control member 2.

[0144] The processing unit 12 can modify the display on the display screen 10 accordingly, in particular to scroll through the commands, for example the air conditioning temperature setting, around the control member 2 and, for example, to produce a change in the color of the screen 10 under the control member 2. Also, the control unit 12 can control a vibration of the actuator 13. The user then perceives a light and haptic feedback.

[0145] Once the desired command has been selected, the user presses the peripheral gripping part 4a to confirm the selection. The force is transmitted from the peripheral gripping part 4a to the capacitive touch screen 3, through the bearing 52 and the base 51 of the guide 5. The force causes a slight movement of the screen 3 that is imperceptible to the user, which is detected by the pressure sensors 11.

[0146] When the force measurement, following the movement of the first metal index 6a, is greater than a detection threshold, the processing unit 12 controls a function, such as validation of the selection (step 102).

[0147] According to a second example of operation, the processing unit 12 controls a flashing display of the screen 10 when it detects an incoming telephone call.

[0148] The user touches the central gripping part 4b of the control member 2 to take the call. The electrical charges are conducted by the external metal surface 9b of the movable gripping element 4 to the second metal index 6b. The capacitive touch panel 3 detects these charges in the area where the control member 2 is arranged. The capacitive touch panel 3 thus detects a contact of the control member 2 (step 101, figure 5 ).

[0149] The user then presses on the central gripping part 4b of the control member 2. As previously, the force is transmitted from the central gripping part 4b to the capacitive touch screen 3. This slight movement of the screen 3 is detected by the pressure sensors 11. When the force measurement associated with the detection of the second metal index 6b carried by the central gripping part 4b is greater than a threshold, the processing unit 12 controls a function such as taking the call (step 102).

[0150] It is thus understood that such an interface 1 makes it possible to detect lateral pressure or central pressure on the control member 2 by taking advantage of the pressure sensors 11 associated with the capacitive touch screen 3.

[0151] In addition, the interface 1 can generate visual feedback, for example in the form of a light ring backlit by the display screen 10, which can be programmable depending on the user's manipulation.

[0152] Furthermore, the interface 1 can generate a vibratory feedback that is also programmable according to the user's manipulations, such as according to the force exerted on the control member 2 or according to the angle of rotation of the peripheral gripping part 4a.

[0153] This results in an interface 1 whose haptic or visual feedback is completely programmable depending on the type of menu in which the user is moving.

[0154] THE figures 6, 7, 8 et 9 are schematic views representing different arrangements of interface 1.

[0155] There figure 6 shows an arrangement similar to that shown in the previous example. In addition to being able to arrange the support sensors 11 as close as possible to the damping elements 17, this configuration allows the display screen 10 to be detached from the capacitive touch screen 3 and fixed to the fixed part 18 as shown in the figure 7 .

[0156] In the embodiments of the figures 8 et 9 , the support sensors 11 are arranged at the rear of the display screen 10. This configuration is interesting because it makes it possible to arrange one or more support sensors 11 under the entire surface of the screen 10.

[0157] The support sensors 11 are for example carried by the electronic card 21 carrying the electronic circuits for managing the display screen 10. This avoids the use of additional electronic cards for the support sensors 11, which facilitates the assembly of the interface 1 and lowers costs.

[0158] As can be seen from the example of the figure 8 , the support 19' extends for example from one end to the other of the screen 10, between the screen 10 and the base 20 carrying the electronic card 21, itself carrying the support sensor 11. The support sensor 11 is thus arranged between the base 20 of the fixed part 18 and the support 19' of the mobile part 16.

[0159] The support sensor 11 can thus measure a distance d1 of the support 19' relative to the base 20 at the rear of the screen 10. Pressing the capacitive touch screen 3 brings the support sensor 11 carried by the electronic card 21 closer to the support 19' of the mobile part 16. With this configuration, the distance d1 decreases when the force increases.

[0160] In the example of the figure 9, the support 19' extends for example from one end to the other of the display screen 10, between the support sensor 11 carried by the electronic card 21 and the base 20. The support sensor 11 can be fixed to the base 20 by studs 20a of the base 20 passing through the support 19'. The support sensor 11 is thus arranged opposite the support 19'. The support sensor 11 can thus measure a displacement d2 of the support 19' relative to the base 20 at the rear of the screen 10. Pressing on the capacitive touch screen 3 moves the support sensor 11 away from the support 19' of the movable part 16. With this configuration, the distance d2 increases when the force increases. In addition to the reduced cost due to the use of a single electronic card 21 common to the screen 10 and the support sensors 11, this configuration makes it possible to increase the measurement precision, particularly for low force values.In fact, the capacitive touch sensor is more precise when it is located close to the target, that is to say for short distances d1, d2.

[0161] In the configurations described, the support sensors 11 are arranged on the periphery of the screen 10 and are therefore not visible to the user.

[0162] It is also possible to use transparent support sensors 11, comprising for example electrodes made of ITO material. The support sensors 11 can then be arranged at the rear of the slab 3, between the capacitive sensor 31 and the screen 10. Transparent spacers can provide an air gap between the screen 10 and the slab 3 to allow capacitive detection of the movement of the moving part 16.

[0163] Also, when the interface 1 is of the “TouchPad” type for example and does not include a screen, the support sensors 11 can be arranged directly behind the capacitive sensor 31, the front plate 32 then being completely opaque.

Claims

1. Interface (1) for controlling at least one function of a motor vehicle member, including: - at least one control member (2) comprising: - a movable gripping element (4), - at least one metal index (6a, 6b) carried by the movable gripping element (4) and movable therewith, - a guide (5), the movable gripping element (4) being supported and guided in displacement by the guide (5), and - the interface further including a capacitive touch panel (3) configured to detect the position of the metal index (6a, 6b), the guide (5) being fastened to the capacitive touch panel (3), the metal index (6a, 6b) being arranged opposite the capacitive touch panel (3), characterized in that the interface (1) includes at least one pressure sensor (11) configured to measure a parameter representative of a pressing force exerted on the capacitive touch panel (3), the detection of the pressing force exerted on the capacitive touch panel (3) enabling detection of a pressing action exerted on the control member (2).

2. Interface (1) according to the preceding claim, characterized in that it includes a fixed part (18) and at least one damping element (17) arranged between the fixed part (18) and a movable part (16) of the interface (1) comprising the capacitive touch panel (3), the pressure sensor (11) being a capacitive sensor configured to measure a displacement of the movable part (16) relative to the fixed part (18).

3. Interface (1) according to the preceding claim, characterized in that the capacitive touch panel (3) includes a front plate (32) on which the guide (5) of the control member (2) is fastened and a capacitive sensor fastened under the front plate (32), on the opposite side to the guide (5).

4. Interface (1) according to the preceding claim, characterized in that it includes at least two pressure sensors (11) arranged on each side of the capacitive sensor (31) under the front plate (32), the pressure sensors (11) being configured to measure a displacement of a support (19) of the movable part (16) carrying the front plate (32) relative to a base (20) of the fixed part (18).

5. Interface (1) according to one of Claims 2 to 4, characterized in that it includes as many pressure sensors (11) as there are damping elements (17), each pressure sensor (11) being arranged close to a respective damping element (17).

6. Interface (1) according to one of the preceding claims, characterized in that it includes a display screen (10) configured to display information associated with an action of touching, moving or pressing the movable gripping part (4) or with an action of touching or pressing the capacitive touch panel (3).

7. Interface (1) according to the preceding claim, characterized in that the display screen (10) is fastened to the capacitive touch panel (3), the capacitive touch panel (3) being at least partially transparent.

8. Interface (1) according to the preceding claim, characterized in that the pressure sensor (11) is arranged behind the display screen (10).

9. Interface (1) according to the preceding claim, characterized in that the pressure sensor (11) is carried by a circuit board (21) of the interface (1) also carrying electronic circuits for managing the display screen (10).

10. Interface (1) according to one of Claims 8 or 9, characterized in that the support (19') extends between the display screen (10) fastened to the capacitive touch panel (3) and the base (20) carrying the pressure sensor (11) so that an action of pressing the capacitive touch panel (3) brings the pressure sensor (11) closer to the support (19').

11. Interface (1) according to one of Claims 8 or 9, characterized in that the support (19') extends between the pressure sensor (11) and the base (20), the pressure sensor (11) being fastened to the base (20) by studs (20a) passing through the support (19') so that an action of pressing the capacitive touch panel (3) moves the pressure sensor (11) away from the support (19').

12. Interface (1) according to one of the preceding claims, characterized in that it includes at least one vibrating actuator (13) configured to vibrate at least the capacitive touch panel (3) in response to an action of touching, moving or pressing the movable gripping element (4) or to an action of touching or pressing the capacitive touch panel (3).

13. Interface (1) according to one of the preceding claims, characterized in that the guide (5) includes a mechanical rolling bearing (52) interposed between a base (51) of the guide (5) and the movable gripping element (4).

14. Interface (1) according to one of the preceding claims, characterized in that the control member (2) includes at least one metal elastic member (8a, 8b), of which a first end is connected to an external metal surface (9a, 9b) of the movable gripping element (4) and a second end is fastened to the metal index (6a, 6b), the metal elastic member (8a, 8b) being configured to bias the metal index (6a, 6b) against the capacitive touch panel (3).

15. Method (100) for controlling at least one function of a motor vehicle member by means of an interface (1) according to one of the preceding claims, wherein at least one function of the interface is controlled when a pressing force exerted on the capacitive touch panel (3) is greater than a threshold.

16. Control method (100) according to the preceding claim, wherein the display screen (10) of the interface (1) is illuminated and / or the control member (2) is backlit when a pressing force exerted on the capacitive touch panel (3) is greater than a wake-up threshold, such as of the order of 0.1 N.

17. Control method (100) according to one of Claims 15 or 16, wherein a function of the interface (1) is controlled when a pressing force exerted on the capacitive touch panel (3) is greater than a pressure threshold, such as of the order of 3 N.

18. Control method (100) according to one of Claims 15 to 17, wherein a function of the interface (1) is controlled relative to the intensity of the pressing force exerted on the capacitive touch panel (3).

19. Control method (100) according to one of Claims 15 to 18, wherein at least one function of the interface (1) is controlled when the capacitive touch panel (3) detects an action of touching the movable gripping part (4) of the control member (2) and when a pressing force greater than a pressure threshold is exerted on the capacitive touch panel (3).

20. Control method (100) according to one of Claims 15 to 19, characterized in that at least one parameter of the generated vibration is controlled relative to the intensity of the pressing force exerted on the capacitive touch panel (3).