Abstract:
A system including an automotive navigation system; an external drive; a first bus for connecting the external drive with the automotive navigation system; a second bus, which is different from the first bus, for connecting the external drive with the automotive navigation system. The external drive is connectable to the automotive navigation system via the first bus and the second bus. The automotive navigation system is adapted to read data from the external drive via the first bus. The automotive navigation system is adapted to control and to monitor the external drive via the second bus.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority to EP Application No. 12 195 961.3, filed Dec. 6, 2012, the disclosure of which is incorporated in its entirety by reference herein. 
       TECHNICAL FIELD 
       [0002]    The present invention relates to a system comprising an automotive navigation system and an external disk drive, in an automotive context. 
       BACKGROUND 
       [0003]    Navigation systems in a vehicle are nowadays commonly used. These systems are more and more becoming control centers of a vehicle for driving, guiding and safety aspects, as well as entertainment aspects. Using a positioning system, most frequently a Global Positioning System (“GPS”), these systems provide precise instructions for navigating the vehicle through different road and traffic environments. The navigation system often serves as a central audio/video platform in the vehicle. Such diverse applications come along with the need for storage space or information stored on different media. For normal computers such as a PC or Laptop, external drives are often used for such purposes. These may be connected via a Universal Serial Bus (“USB”) interface. Such external drives may be storage drives, hard disks or optical drives for Blu-ray Disk (“BD”), DVD or CD. Such drives may be temporally installed in a vehicle or may be retrofitted. The external character of such drives provides for the possibility of exchanging or upgrading them in an easy way. In an automotive environment, in a vehicle, however, the USB bus is usually not able to provide all requested functionality with respect to controllability needed or requested for such a specific environment. In a vehicle, also the Media Oriented Systems Transport (“MOST”) bus may be used for connecting an external drive. However, the MOST bus is also not able to provide all requested functionality with respect to controllability needed for such an environment. This functionality may include diagnosing present states of the external drive, intervening in case a specific state of the external drive has been determined. Also, it may be requested to limit standby current per external device. Neither MOST nor USB bus would be able to provide a low standby current per external device. 
         [0004]    It is therefore an object of the present invention to provide an improved concept for external drives for a navigation system in a vehicle. 
       SUMMARY 
       [0005]    The above-mentioned object is achieved by a system comprising an automotive navigation system and an external drive according to the claims. 
         [0006]    The invention provides a system including an automotive navigation system; an external drive; a first bus for connecting the external drive with the automotive navigation system; a second bus, which is different from the first bus, for connecting the external drive with the automotive navigation system; wherein the external drive is connectable to the automotive navigation system via the first bus and the second bus; wherein the automotive navigation system is adapted to read data from the external drive via the first bus; and wherein the automotive navigation system is adapted to control and to monitor the external drive via the second bus. 
         [0007]    The automotive navigation system typically is integrated into the vehicle or has been retrofitted to the vehicle. It is also possible to consider portable automotive systems which are only temporarily installed in a vehicle. The first bus will typically provide basic connectivity functions and data connection functions such that the automotive navigation system may read data from the external drive or provide data to the external drive. For some external drives, the first bus may also serve for providing power to the external drive. The second bus which may also be called control bus provides additional control and diagnostic possibilities independently of the first bus. The standby power consumption of the external drive may be extremely low, for example, less than 50 μA. 
         [0008]    In the system the automotive navigation system may be adapted to monitor the external drive via the second bus. 
         [0009]    The state or functions of the external drive may be monitored via the second bus. It should be understood that the automotive navigation system may provide periodical reports or indications on the status of the external drive. These reports or indications may comprise optical and/or acoustical messages to the user (i.e., the driver and/or passengers) of the vehicle. 
         [0010]    In the system, the automotive navigation system may be adapted to diagnose, via the second bus, whether or not a malfunction of the external drive has occurred, and/or may be adapted to diagnose, via the second bus, whether voltages provided via the first bus, are detectable in the external drive. 
         [0011]    Possible incorrect behavior of the external drive may be diagnosed by the automotive navigation system via the second bus. This may include diagnosing the supplied voltages provided via the first bus. 
         [0012]    In the system, the automotive navigation system may be adapted to place, via the second bus, the external drive into a standby mode or may be adapted to wake up, via the second bus, the external drive from a standby mode. 
         [0013]    In the system, the automotive navigation system may be adapted to update, via the second bus, the external drive, and/or may be adapted to load, via the second bus, firmware to the external drive and/or may be adapted to load, via the second bus, firmware to the first bus. 
         [0014]    In the system, the external drive is an optical drive suitable for reading optical disks such as Blu-ray Disk, BD, DVD or CD, and where the automotive navigation system may be adapted to monitor, via the second bus, whether an optical disk is loaded by the external drive, and/or may be adapted to eject an optical disk. 
         [0015]    In the system, the external drive includes one or more of status indicators such as LEDs, mechanical or electronic interlock systems, motors; wherein automotive navigation system may be adapted to monitor or control one or more of the status indicators, mechanical or electronic interlock systems, or motors. 
         [0016]    In the system, the first bus is a USB or MOST bus, and where the second bus is a Local Interconnect Network (“LIN”), Controller Area Network (“CAN”), Universal Asynchronous Receiver Transmitter (“UART”), Serial Peripheral Interface (“SPI”), or Inter-Integrated Circuit (“I2C”) bus. 
         [0017]    The invention further provides a method of controlling an external drive in a system including an automotive navigation system, the external drive, a first bus, a second bus, which is different from the first bus, the external drive being connectable to the automotive navigation system via the first bus and the second bus. The method includes reading data from the external drive via the first bus; controlling and monitoring, by the automotive navigation system, the external drive via the second bus. 
         [0018]    The method may further include a step of diagnosing, by the automotive navigation system via the second bus, whether or not a malfunction of the external drive has occurred, and/or whether voltages provided via the first bus, are detectable in the external drive. 
         [0019]    The method may further include a step of putting, by the automotive navigation system via the second bus, the external drive to a standby mode or waking up, by the automotive navigation system via the second bus, the external drive from standby mode. 
         [0020]    The method may further include a step of updating, by the automotive navigation system via the second bus, the external drive, and/or loading, by the automotive navigation system via the second bus, firmware to the external drive and/or loading, by the automotive navigation system via the second bus, firmware to the first bus. 
         [0021]    The method may further include a step of monitoring, by the automotive navigation system via the second bus, whether an optical disk is loaded by the external drive, and/or may be adapted to eject an optical disk; wherein the external drive is an optical drive suitable for reading optical disks such as Blu-ray Disk, BD, DVD or CD. 
         [0022]    In the method, the external drive may include one or more of status indicators such as LEDs, mechanical or electronic interlock systems, motors; and the method may further include a step of monitoring or controlling one or more of the status indicators, mechanical or electronic interlock systems, or motors. 
         [0023]    In the method, the first bus may be a USB or MOST bus, the second bus may be a LIN, CAN, UART, SPI, or I2C bus. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0024]    Additional features and advantages of the present invention will be described with reference to the drawings. In the description, reference is made to the accompanying figures that are meant to illustrate preferred embodiments of the invention. It is understood that such embodiments do not represent the full scope of the invention. 
           [0025]      FIG. 1  illustrates a system comprising a automotive navigation system and an external drive in accordance with an example of the present invention. 
           [0026]      FIG. 2  illustrates a particular embodiment of the present application wherein examples of internal features of the external drive are shown. 
       
    
    
     DETAILED DESCRIPTION 
       [0027]    In  FIG. 1 , a system  100  is shown which comprises an automotive navigation system  1  and an external drive  13 . The automotive navigation system  1  may be installed in or integrated into the vehicle. The automotive navigation system  1  may also be retrofitted to the vehicle. The automotive system  1  may provide navigation services for the user of the vehicle using positioning systems such as a GPS or similar systems. In principle, the automotive navigation system  1  may also be a portable automotive navigation system. The automotive navigation system  1  as shown in  FIG. 1  comprises an automotive navigation unit or control unit  3 . This unit may also comprise a CPU. The automotive navigation unit  3  is connected via connecting line or connecting cable  5 C with a first bus  5 . The first bus  5  may be a USB bus or a MOST bus. The first bus  5  typically provides the data connection with an external unit.  FIG. 1  depicts an external drive  13  which is connected by connection cable  9  with the first bus  5 . The installation or location of the external drive  13  may be independently chosen from the location of the automotive navigation system  1 . Additionally, for some external drives, the first bus  5  may provide power for the external drive  13 . 
         [0028]      FIG. 1  further shows a second bus  7 . The second bus  7  is connected to the automotive navigation unit  3  by a connecting line or connecting cable  7 C. Both the connecting cable  5 C and the connecting cable  7 C may be known cables for connecting buses. It is also possible to gather cables  5 C and  7 C in a common, single cable (not shown). The second bus  7  is connected with the external drive  13  by connection cable  11 . The second bus  7  provides the possibility for diagnosing and controlling functions with respect to the external drive  13 . The second bus  7  may operate independently of the first bus  5 . The external drive  13  may be an external disk such as an external hard disk drive. The external drive  13  may be a removable drive. The external drive  13  also may comprise an optical drive such as a Blu-Ray disk, BD, or DVD or CD. The external drive  13  may further be provided with a digital rights management (“DRM”) system such as Advanced Access Content System (“AACS”). In  FIG. 1 , the connection cables/lines  9  and  11  are directly connected with the external drive  13 . It is also possible to connect cables  9  and  11  via an interface plug (not shown) for one or both of the first bus and the second bus,  5  and  7 , respectively. 
         [0029]      FIG. 2  shows a further example of an embodiment of an external drive  53  in an automotive navigation system according to the present invention. The external drive  53  may be similar to the external drive  13  shown in  FIG. 1 . The external drive  53  as depicted in  FIG. 2  comprises an electronics unit  15  and a drive unit  25 . The drive unit may be an optical drive such as the BD or the DVD. The electronics unit  15  is connected via connecting lines  9  and  11  with the first and second bus as is shown in  FIG. 1 . The lines  9  and  11  in  FIG. 2  correspond to the lines  9  and  11  in  FIG. 1 . 
         [0030]    The electronics unit  15  comprises a power supply unit  17 . The power supply unit  17  may provide power for the external drive  53 . In particular, the power may provide power to the drive unit  25  (i.e., a BD or DVD unit). The power supply unit  17  also may provide standby power for the drive unit  25 . The electronics unit  15  further comprises a bridge unit  19 , for example, a USB bridge. It should be understood that MOST may be used for the first bus. The bridge unit  19  may receive power or bridge power from the power supply unit  17  via power connection  35 . The power supply unit  17  thus may provide power to the bridge unit  19 . The power supply unit  17  may also provide standby power to the bridge unit  19 . The bridge unit  19  in  FIG. 2  is connected to the first bus via connection cable  9 . The bridge unit  19  provides bridging between the USB and serial AT attachment (“SATA”) or between USB and AT Attachment Packet Interface (“ATAPI”). Thus, the USB to SATA or USB to ATAPI bridge provides the possibility to connect the BD or DVD unit using a standard bridge. 
         [0031]      FIG. 2  also shows a controller unit  21 . The controller unit  21  may comprise a LIN controller for connecting via the second bus  11  to the automotive navigation system as shown in  FIG. 1 . The LIN controller  21  may comprise EEPROM or flash memory storage. The LIN controller  21  provides the possibility for watchdog and/or reset tasks with respect to the drive unit  25  of the external drive  53 . 
         [0032]      FIG. 2  further shows a transceiver unit  23 . The transceiver unit  23  may provide a wakeup for the controller unit  21 . The transceiver unit  23  also may be connected via connecting cable  13  with the power supply  17  to provide a wakeup from standby for the power supply  17 . It is also possible to place the power supply unit  17  in standby via the transceiver unit  23 . For such a case, the automotive navigation system  1  as shown in  FIG. 1  may provide the signals via the second bus  7 . These signals are then communicated to the transceiver unit  23  as shown in  FIG. 2  via the connecting line  11 . The transceiver unit  23  may further communicate as a sender or a receiver with the controller  21  (i.e., the LIN controller in this example). In  FIG. 2 , the transceiver unit  23  exchanges data with the controller unit  21  via connecting cable  33 . 
         [0033]    The drive unit  25  is connected with the electronics unit  15 . In particular, the power supply unit  27  provides power to the drive unit  25  via connecting cable/line  27 . Thus, the standby and/or wakeup function with respect to the drive unit  25  can be performed via this connection. The bridge unit  19  connects to the drive unit  25  via the connecting line  29 . As indicated above, the connection serves as a data connection. It may be ATAPI or SATA or other alternative buses. The controller unit  21  is connected to the external drive via connecting line  31 . Control signals such as a signal for ejecting a disk may be communicated via connecting line  31 . Connecting line  31  may also serve as a communication line for diagnosing a state of the drive unit  25 , such as to verify that a disk is loaded or that no disk is present in the drive. The connecting line may also serve to diagnose further mechanical or electronic switches (not shown) of the drive unit  25 . The line  27 ,  29  and  31  may be gathered in an FPC cable. 
         [0034]    All previously discussed embodiments are not intended as limitations but serve as examples illustrating features and advantages of the invention. It is to be understood that some or all of the above described features can also be combined in different ways.