Abstract:
Methods and apparatus are provided for interference reduction during keyless authentication. The apparatus includes a control system having a controller configured to detect an authentication event and deactivate at least one device within the vehicle. The control system is also configured to transmit an authentication command and to reactive the at least one device within the vehicle in response to receiving a valid authentication signal. The method includes an authentication method for a user to operate a vehicle wherein an authentication event is detected and at least one device within the vehicle is deactivated. An authentication command is transmitted and the at least one device within the vehicle is reactivated in response to receiving a valid authentication signal.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of U.S. Provisional Application No. 61/521,688 filed Aug. 9, 2011. 
     
    
     TECHNICAL FIELD 
       [0002]    The technical field generally relates to keyless ignition systems for vehicles, and more particularly to interference reduction within the vehicle during keyless ignition authentication. 
       BACKGROUND 
       [0003]    It is known in the art to provide remote activation devices, especially in connection with vehicles. These often take the form of a small electronic fob that can be conveniently carried by the vehicle operator. The fob usually contains a radio transceiver that communicates with a transceiver and control system of the vehicle. For example, when a user activates an “unlock” button on the fob, the fob sends a radio message to the vehicle control system, which then causes one or more of the door locks to open. 
         [0004]    One recent modernization of ignition systems is the advent of “keyless” ignition systems with “push-button” (or other keyless) engine starting. Such systems use an electronic “key” (code within the fob) that does not have to be inserted into an ignition switch of a vehicle, but merely be present in a predetermined authorization zone, such as the passenger compartment of the vehicle. When the control system detects that an authorized electronic key is within the authorization zone, the driver may start the vehicle by simply activating (e.g., pressing) the ignition starter (e.g., button). If the control system does not detect an authorized key within the authorization zone, the control system disables the ignition system of the vehicle so that the vehicle cannot be started. 
         [0005]    One drawback of keyless ignition systems is that they operate at relatively low power levels so as not to extend the authentication zone beyond the passenger compartment of the vehicle. Also, typical keyless ignition systems operate within a relatively low frequency band (e.g., 20-134 kHz). Both these conditions render conventional keyless ignition systems susceptible to magnetic or electrical interference, which may impede or prevent authentication. Failure or delay in properly authenticating a valid vehicle user may frustrate the vehicle user and detract from her/his enjoyment of the vehicle. 
         [0006]    Accordingly, it is desirable to provide a keyless ignition system for a vehicle. Also, it is desirable to reduce interference within the vehicle during keyless ignition authentication. Additionally, other desirable features and characteristics of the present invention will become apparent from the subsequent description taken in conjunction with the accompanying drawings and the foregoing technical field and background. 
       SUMMARY 
       [0007]    An apparatus is provided for interference reduction during keyless authentication. In one embodiment, the apparatus includes a control system having a controller configured to detect an authentication event and deactivate at least one device within the vehicle. The control system is also configured to transmit an authentication command and to reactivate the at least one device within the vehicle in response to receiving a valid authentication signal. 
         [0008]    A method is provided for interference reduction during keyless authentication. In one embodiment, the method includes an authentication method for a user to operate a vehicle wherein an authentication event is detected and at least one device within the vehicle is deactivated. An authentication command is transmitted and the at least one device within the vehicle is reactivated in response to receiving a valid authentication signal. 
     
    
     
       DESCRIPTION OF THE DRAWINGS 
         [0009]    The subject matter will hereinafter be described in conjunction with the following drawing figures, wherein like numerals denote like elements, and: 
           [0010]      FIG. 1  is an illustration of a keyless ignition fob suitable for use in exemplary embodiments of the present disclosure; 
           [0011]      FIG. 2  is an illustration of a vehicle suitable for using the keyless ignition fob of  FIG. 1  in accordance with exemplary embodiments of the present disclosure; and 
           [0012]      FIG. 3  is a flow diagram of an interference reducing keyless ignition authentication method in accordance with exemplary embodiments of the present disclosure. 
       
    
    
     DESCRIPTION 
       [0013]    The following detailed description is merely exemplary in nature and is not intended to limit the subject matter of the disclosure or its uses. Furthermore, there is no intention to be bound by any expressed or implied theory presented in the preceding technical field, background, brief summary or the following detailed description. 
         [0014]    In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Numerical ordinals such as “first,” “second,” “third,” etc. simply denote different singles of a plurality and do not imply any order or sequence unless specifically defined by the claim language. 
         [0015]    Additionally, the following description refers to elements or features being “connected” or “coupled” together. As used herein, “connected” may refer to one element/feature being directly joined to (or directly communicating with) another element/feature, and not necessarily mechanically. Likewise, “coupled” may refer to one element/feature being directly or indirectly joined to (or directly or indirectly communicating with) another element/feature, and not necessarily mechanically. However, it should be understood that, although two elements may be described below, in one embodiment, as being “connected,” in alternative embodiments similar elements may be “coupled,” and vice versa. Thus, although the schematic diagrams shown herein depict example arrangements of elements, additional intervening elements, devices, features, or components may be present in an actual embodiment. 
         [0016]    Finally, for the sake of brevity, conventional techniques and components related to vehicle electrical parts and other functional aspects of the system (and the individual operating components of the system) may not be described in detail herein. Furthermore, the connecting lines shown in the various figures contained herein are intended to represent example functional relationships and/or physical couplings between the various elements. It should be noted that many alternative or additional functional relationships or physical connections may be present in an embodiment of the invention. It should also be understood that  FIGS. 1-2  are merely illustrative and may not be drawn to scale. 
         [0017]      FIG. 1  illustrates a fob  10  that includes, but is not limited to, an “unlock” function button  12  to unlock one or more doors of the vehicle; a “lock” function button  14 , which typically locks all doors of the vehicle; and an “alarm” function button  16  for emergency situations. The fob  10  may also include a key attachment aperture  18  in the fob case  20  facilitating the user to attach a key ring to carry the user&#39;s home, office or other keys along with the fob  10 . 
         [0018]      FIG. 2  illustrates fob  10  interacting with a vehicle  30 . When one of the function buttons ( 12 ,  14  or  16  of  FIG. 1 ) on fob  10  is activated by the user, fob  10  sends wireless signal  32  to the vehicle  30  where it is received by antenna  34  coupled to a control system  36  (e.g., a vehicle controller). Control system  36  interprets the signal  32  received from fob  10  and, depending upon which function has been activated by the user, causes the corresponding vehicle sub-system to respond. For example, if the “unlock” button ( 12  of  FIG. 1 ) has been activated, then control system  36  causes a lock  38  on door  40  to move from a locked to an unlocked position. 
         [0019]    Unlocking door  40  is one of a number of triggers that cause the control system  36  to begin an authentication process by which the control system verifies that the fob is within an authentication zone, such as the passenger compartment  42 . Typically, the control system  36  transmits a signal or command to the fob  10 , which, if within range (typically limited to the passenger compartment  42 ), responds with a signal containing a valid authentication code that the control system can compare to stored authorized codes for starting and operating the vehicle  30 . Other triggers causing the control system  36  to initiate the authentication process include, but are not limited to receiving signals indicating (detecting), the door  40  opening or closing, activation of an engine start actuator (e.g., button) or an individual sitting in the driver seat (not shown) of the vehicle  30 . 
         [0020]    However, in an effort not to extend the authentication zone beyond the passenger compartment  42  of the vehicle  30 , most keyless ignition systems operate at relatively low power levels and in a relatively low frequency band (e.g., 20-134 kHz) rendering conventional keyless ignition systems susceptible to magnetic or electrical interference (hereinafter “interference”) that may impede or prevent authentication. It is expected that either by design or usage, one or more devices capable of generating interference within the frequency band used for authentication will be operated within the passenger compartment  42  of the vehicle  30 . Such devices include, but are not limited to, wireless cellular telephone charging systems, accessory 12 volt power outlets (and user devices coupled thereto); cigarette lighters (and user devices coupled thereto); and AC inverter circuits (and user devices coupled thereto). Any one of these devices, or combinations of them, may generate enough interference to impede or prevent authentication, which may frustrate the operator of the vehicle. 
         [0021]    According to exemplary embodiments, the present disclosure reduces such interference by temporarily deactivating devices of known or potential interference. Deactivation may be effected via a number of actions including, but not limited to, interruption of power to such devices; transmitting a command signal to such devices causing them to cease transmitting or operating internal circuits producing the interference; or, for devices coupled to a vehicle wired or wireless network, broadcasting a network message to such devices causing them to cease transmitting or operating internal circuits producing the interference. Deactivation of the known or potential interfering devices is temporary (for some time period) or until the authentication process has completed as will be discuss below in conjunction with  FIG. 3 . In this way, interruption of the use and enjoyment of these devices is minimized and the authentication process is unimpeded. 
         [0022]    Referring now to  FIG. 3 , a flow diagram illustrating a method  50  for keyless ignition in accordance with exemplary embodiments is shown. The various tasks performed in connection with the method  50  of  FIG. 3  may be performed by software, hardware, firmware, or any combination thereof. For illustrative purposes, the following description of the method of  FIG. 3  may refer to elements mentioned above in connection with  FIGS. 1-2 . In practice, portions of the method of  FIG. 3  may be performed by different elements of the described system. It should also be appreciated that the method of  FIG. 3  may include any number of additional or alternative tasks and that the method of  FIG. 3  may be incorporated into a more comprehensive procedure or process having additional functionality not described in detail herein. Moreover, one or more of the tasks shown in  FIG. 3  could be omitted from an embodiment of the method of  FIG. 3  as long as the intended overall functionality remains intact. 
         [0023]    The routine begins with decision  52  operating in a loop to determine whether an authentication trigger event has been detected. According to various embodiments, authentication events include, but are not limited to one or more of the following events: an “unlock” signal is received from fob  10 ; detecting door  40  opening or closing, detecting activation of an engine start actuator (e.g., button) or detecting an individual sitting in the driver seat (not shown) of the vehicle  30 . Once an authentication event is detected, step  54  disables all known or potential devices operating within the vehicle that may generate interference within the frequency band used for authentication. Such devices include, but are not limited to, wireless cellular telephone charging systems, accessory 12 volt power outlets (and user devices coupled thereto); cigar lighters (and user devices coupled thereto); and AC inverter circuits (and user devices coupled thereto). Next, step  56  transmits an authentication command signal within the authorization zone and decision  58  determines whether a valid authorization code was received. If so, the devices are reactivated (step  64 ) to minimize the time when the devices cannot be used and enjoyed by the vehicle occupants. However, a negative determination of decision  58  result in decision  60  determining whether the time period for the fob responding has expired. If not, the routine loops back to decision  58 . However, if the time period has expired, the routine continues. In one embodiment, the devices are immediately reactivated (step  64 ). However, in other embodiments, more than one authentication attempt (e.g., three or five) may be made by including decision  62 , which queries whether the designated number of authentication attempts have been made. If not, the routine loops back to retransmit the authentication command signal (step  56 ), however, if all designated authentication attempts have been made, the devices are reactivated in step  64 , and the routine returns again to the detection loop of decision  52 , which awaits another authentication event. 
         [0024]    Accordingly, a keyless ignition system is provided for a vehicle that reduces interference during the authentication process. While at least one exemplary embodiment has been presented in the foregoing summary and detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the disclosure in any way. Rather, the foregoing summary and detailed description will provide those skilled in the art with a convenient road map for implementing the exemplary embodiment or exemplary embodiments. It should be understood that various changes can be made in the function and arrangement of elements without departing from the scope of the disclosure as set forth in the appended claims and the legal equivalents thereof.