CAPACITIVE SWITCH AND LED LIGHTING

CROSS REFERENCE TO RELATED APPLICATION

[0001] This application claims the benefit of U.S. patent application

14/605.262 filed January 26, 2015, which is .incorporated by reference as if fully set forth.

FIELD OF INVENTION

[0002] This application is related, to vehicle electronics.

BACKGROUND

[0003] Vehicles have a number of power entry systems which ma include automatic power lift gates, trunk lids or hoods, sunroofs, sliding doors, and doors. Users may want, to use a touch-less activation of the power entr systems upon approaching the vehicle or when they are in the vehicle due to security or convenience reasons.

[0004] Most of the newer vehicles are also equipped with a radio frequency (RF) system that is able to detect and verify if a key fob/transponder associated with the vehicle is in the immediate proximity of the vehicle and "wake-up" the vehicle.

[0005] Prior technology used ultrasonics or the "open -sesame" technique. In tbis approach, a sensor recognizes the movement of a foot as a signal to open the tail gate, it would he preferable to have a method of activation that does not require standing on one leg and also offers a visible indication of switch status.

SUMMARY

[0006] A system, device and method for opening an electromechanical system of vehicle. The system includes a capacitive emblem switch and a. transponder, where the transponder includes an identifier of the vehicle. The capacitive emblem, switch is activated when the user is in proximity of the vehicle wit the transponder. The electromechanical system, such as a rear hatch of the vehicle opens when the user motions in front of the activated capacitive emblem switch . In embodiments, the capaciti ve emblem switch may be incorporated into a vehicle logo or a vehicle model number. In an embodiment, LED lights are used to indicate activation of the capacitive emblem switch. The LED lights may change color to indicate a completion of the method. The capacitive emblem switch may be transparent. The transponder may be a key fob,

BRIEF DESCRIPTION OF THE DRAWINGS

0007 ^' J FIG, 1 is an example of a vehicle emblem;

[0008] FIG. 2 is an example of the vehicle emblem with dimensions and more detail;

[0009] FIG , 3 is an example of a logo o the emblem;

[0010] FIG. 4 is an example of the connections from the vehicle emblem to the control hoard;

[00 Il| FIG. δ is an example of the transparent capacitive switch;

[0012] FIG. 6 is an example cross-section of the transparent capacitive switch;

[0013] FIG. 7 is an example of a capacitive sensor system;

[0014] FIG . 8 is an example system of a capacitive switch emblem: and

[0015] FIG. 9 is an example flowchart of opening an electromechanical system using a capacitive switch emblem.

DETAILED DESCRIPTION

[0018] it is to be understood that the figures and descriptions of embodiments of a system and method of activating or triggering predetermined functions for incorporating a capacitive switch and light emitting diode (LED) lightin into a vehicle emblem have bee simplified to illustrate elements that are relevant for a clear understanding, while eliminating, for the purpose of clarity, many other elements found in typical vehicle systems. Those of ordinary skill in. the art ma recognize that other elements and/or steps are desirable and/or required in implementing the present invention. However, because stteh. elements and steps are well know in the art, and because they do not facilitate a better understanding of the present invention, a discussion of such elements and steps is not provided herein.

[0017 _. 1 T non-limiting embodiments described herein are with respect- to a system, and method of incorporating a capacitive switch and LED lighting into vehicle emblem. Other electronic devices, modules and applications may also be used in view of these teachings without deviating from the spirit or scope as described herein. The system and method of incorporating a capacitive switch and a light emitting diode (LED) lighting into a vehicle emblem may he modified for a variety of applications and uses while remaining within the spirit and scope of the claims. The embodiments and variations described herein, and/or shown in the drawings, are presented by way of example only and are not limiting as to the scope and spirit. The descriptions herein may be applicable to all embodiments of the system and. method of activating or triggering predetermined functions for incorporating a. capacitive switch and .LED lightin into a vehicle emblem although it may be described with respect to a particular embodiment.

[0018] A hands-free method of activating a power lift gate module may include a sensor located on a vehicle for detecting an input, action by the user indicating they wish to open the power lift gate. The sensor may be a motion sensor for detecting a particular motion of the user at a. particular location, fo example in a vehicle emblem or the like. The motion sensor may detect movement of the user, for example a hand, or arm wave, in close proximity to the vehicle. The vehicle may require an. additional input, such as a key fob/transponder. The vehicle may detect the proximity of the key fob and activate the motion sensor to allow the user to perform the required action and open, the power lift gate.

[0019] In an embodiment, an emblem capacitive switch may use the original equipment manufacturer (OEM) vehicle emblem as a switch to activate automatic tail, gate opening. Although a vehicle emblem, is described, herein, other vehicle structures or indicia may be used, such as a vehicle logo. vehicle model number and the like. Although opening a tail gate is described herein, other doors or .like items can he opened using the devices and methods described herein. A switch function may be integrated into the current OEM electronic control function in place of the foot swipe currently being used. By moving the location of the switch from the foot swipe, at the undercarriage of the car, to the vehicle emblem, the use no longer has to balance on one foot o worry about dirt, snow, or ice. Instead the riser must only be in proximity of the emblem using either the elbow, knee, hip, or hand. The location change makes the emblem capacitive switch easier to utilize. LED lighting may be used to indicate readiness as well as highlight switch position and add to customer brand recognition. The same switch sensor and control board may be used across multiple emblem designs. The LED lighting may change color to indicate a completion of the method.

[00201 Figure 1 is an example of a vehicle emblem. The vehicle emblem

100 includes a housing 101 and the emblem 102.

[0021] Figure 2 is a more detailed illustrative example of a vehicle emblem 200, Figure 2 shows the vehicle emblem 200 from both the top view 200(a) and the side view 200(b). The top view 200(a) of the vehicle emblem i illustrated with two cross-sections; cross-section. A 201 and cross-section B 202, Cross-section A 201 is cut along the horizontal of the vehicle emblem 200, whil cross-section B 202 is cut along the vertical of the vehicle emblem 200. In cross-section A 201 several internal components are illustrated including a driver circuit printed circuit board (PCB) 205, a cover 210, an LED backlight 215, the Flextronics logo capacitive switch 220, and a MTCH112 PCB 225. Additionally, cross-sectio A 201 includes detail Z 230, Detail Z 230 shows a backlight 235 and the Flextronics logo 240. Cross- section B 202 shows the PCB stand offs 245, The side view 200(b) of the vehicle emblem shows the housing 250, Although some dimensions are shown in Figure 2, (where the units are in millimeters (mm)), the switch would be integrated into the OEM logo, and can be made to match the size of the logo, e.g. Ford blue oval The depth of the switch would also be appropriate to the logo, emblem or the like.. In some embodiments, the depth may be between 5 to 10 mm. [0022] Figure 3 is an example of a logo on the emblem. The inside of the X 301 is transparent. The outside of the X 302 may is opaque white. In another embodiment, the inside of the X 301 is translucent.

[0023J The emblem may be made of acrylic to allow backlighting of the emblem. The emblem may have a transparent capacitive switc attached to the backside. The switch may be attached using an optically clear pressure- sensitive adhesive (PSA). The tail of the switch may plug into a printed circuit board CPCB) with driver electronics for the capacitive switch and LED lights.

[0024] Figure 4 is an example of the connections from the vehicle emblem to the control board. The vehicle emblem 400 is connected to the control board 402 via 2 wires 405 and 410,. The logo (not shown) is connected to the sensor (not shown) via. a sensor to shield connector 415.

[0025] Figure 5 is an example of the transparent capacitive switch. By adjusting lighting conditions the transparent ink pattern 501 of the transparent capacitive switch 500 may be discerned in the above example, but invisible i the final assembly, making it an ideal solution for a backlit capacitive switch in this application, in another embodiment and as used herein, the capacitive switch is translucent,

[0026] Figure 6 i an example cross-section of the transparent capacitive switch. The transparent capacitive switch 600, when cut along cross-section A, includes several layers of material. The cross section includes an optically clear PSA 601 for bondin to a polycarbonate emblem, carbon Ink for ZIF contacts 602, screened via holes 603, transparent conductive ink 604 (on both the top and bottom of the capacitive switch if electromagnetic (EMI) shielding is needed), silver conductive ink 605, polyethylene terephthalate (PET) base film 606, carbon or silver conductive ink 607 (for shielding, if needed), a film stiffener 609 (added to match the ZIF thickness requirement), and a clear SM ink that covers all conductive ink surfaces on the to and bottom of the capacitive switch 609.

[0027] The transparent capacitive switch is incorporated into a capacitive sensor. The capacitive sensor is used to activate the power lift gate when a user is in proximity and performs the required action, for example, arm or hand waving, in front of the vehicle emblem.

[0028| Figure 7 is an. example of a capacitive sensor demo system. It may be assumed that a power lift gate (PLG) demo system contains a battery wit a voltage higher than 5.0V. it may also be assumed that, upo activation, the MTO signal is a level shift signal going from 3.3V to O.QV with a duration of at least 5 ms. The Flextronics EH interface module includes a latching circuit. The LCD will-light up on firs activation and stay on until the next sensor activation.

[00291 Figure 8 is an example of a system 800 for opening an electromechanical system 805 of a vehicle. The electromechanical system 805 may be, for example, a rear hatch. The electromechanical system 805 is in communication with or connected to an electronics control uni (ECU) 810, which in turn is further in communication with or connected to a capacitive emblem switch 815. A key fob/transponder 820 may be in communica ion with the ECU 810, where the key fob/transponder 820 includes an identifier of the vehicle. The capacitive emblem switch 815 may include LEDs 825 or alternatively, the LEDs 825 may be in communication with or connected to the ECU 810 or the capacitive emblem switch 815. Operationally, the capacitive emblem switch 815 may be activated by a user carrying the key fob/transponder 820, The user then motions or gestures proximate to the activated capacitive emblem switch 815, The capacitive emblem switch 815 communicates with the ECU 810, which In turn signals the electromechanical systems 805 to open, for example, the rear hatch of the vehicle.

[00301 Figure 9 is a example of a flowchart 900 for opening an electromechanical system of a vehicle. A radio frequency (EE) system, of a vehicle is awakened based on an event or on a periodic basis (905), The RF system determines whether it has detected a transponder (9.10). If a transponder has not been detected (915), the RF system goes into sleep mode (920) and waits for the next event or awake period. (925). If a transponder has been, detected (930), then an identification signal in the transponder signal is verified o authorised against a vehicle identification value (935). If the identification signal is not authorized (940), the EF system goes into slee mode (920) and waits fo the next event or awake period (925), If the identification signal is authorized (945), then a capacitive emblem switch may be activated (950), A visual signal may be activated to indicate readiness (055), For example, a light source may be illuminated to indicate readiness to the user. The capacitive emblem switch then determines if motion is detected (960). If motion is not detected (965), the RF system goes into sleep mode (020) and waits for the next event or awake period (925), If motion, is detected (970), then an electromechanical system may be triggered to open (975), for example, a rear hatch of a vehicle.

[0031] As described herein, the methods described herein are not limited to any particular eieraent(s) that periorm(s) any particular finiction(s) and some steps of the methods presented need not necessarily occur in the order shown. Fo example, in some cases two or more method steps may occur in a different order or simultaneously. In addition, some steps of the described methods ma be optional (even if not explicitly stated t be optional) and, therefore, may he omitted. These and other variations of the methods disciosed herein will be readily apparent, especially in view of the description of the systems described herein, and are considered to be within the full scope of the invention,

[00323 Although features and elements are described above in particular combinations, each feature or element can be used alone without the other features and. elements or in various combinations with or without other features and elements.