Abstract:
An interface module in a vehicle that provides for the vehicle a connection to a communication network, for example the Internet, and executes the function of a watchdog for the components in the vehicle connected to it. For this purpose, a processor of the interface module performs a function test of the connected components at specified time intervals and sends a function signal as a function of this function test. If at least one component is not functioning properly, the processor restarts the component concerned. This is achieved for example by switching a circuit breaker.

Description:
FIELD OF THE INVENTION 
   The present invention is directed to an interface module in a vehicle. 
   BACKGROUND INFORMATION 
   An interface module that connects a vehicle to a computer via a radio interface via the Internet arises from U.S. patent application Ser. No. 10/573,074. The radio interface is connected within the vehicle to vehicle components and may be used to monitor vehicle components. 
   SUMMARY OF THE INVENTION 
   The interface module according to the present invention in a vehicle has the advantage over the related art that the function of a watchdog is allocated to the interface module when monitoring the components. In the process, a function signal that states that the components being monitored are functioning properly is repeatedly produced at specified time intervals and sent via the radio interface and the Internet, i.e., a communication network, in order to be collected in a computer. Such fleet management with respect to monitoring the functional capability of the individual components is possible in particular for vehicles for public short-distance passenger transportation. 
   It is particularly advantageous when, in order to possibly remedy the error in this manner, the processor of the interface module triggers a restart of the component concerned when a function signal cannot be produced because a component shows a faulty behavior during a test. This restart may be advantageously triggered by switching a circuit breaker that switches off and on again the energy supply to the component concerned. A relay may be used as such a circuit breaker, for example. 
   Furthermore, it is an advantage for the components to belong to an infotainment system positioned in a public short-distance passenger transportation vehicle. Here, the watchdog function in particular is an advantage since the persons watching the infotainment components in the vehicle cannot operate them; a preset program runs instead. As a result, a restart by a user is not possible here, so that here, the interface module according to the present invention takes remedial action. 
   Through the use of semiconductor memories in the interface module according to the present invention, it is possible to do without turning parts as well, such as a hard disk. This facilitates a greater degree of freedom in the assembly and in the load-carrying capacity of the interface module according to the present invention. 
   Finally, it is also an advantage that the components in the vehicle are connected to the interface module via a bus, for example a CAN-bus. All connected components then have a bus controller. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a block diagram of the device according to the present invention in the vehicle. 
       FIG. 2  shows a vehicle with the device according to the present invention, connected to a base station via radio. 
       FIG. 3  shows a flow chart of the method that runs in the interface module according to the present invention. 
   

   DETAILED DESCRIPTION 
   Multimedia and infotainment systems for passenger entertainment and information are being installed in more and more vehicles. This applies in particular to private vehicles, airplanes, buses, and trains. In this area, relatively reasonably priced systems are also increasingly being used, whose system architectures are derived from the desktop and server field of industrial automation and telecommunication. This affects the computer architectures utilized as well as the operating systems used. 
   A device shall now be created according to the present invention that monitors and controls the available multimedia and infotainment systems and helps to reduce possible downtimes, and creates better diagnostic possibilities as well. In particular, critical boot, shutdown, and reset operations of the components may also be monitored and controlled in such a manner. 
   The interface module used for device monitoring must distinguish itself through very high reliability. On the other hand, the components to be monitored are often not available with the same reliability because of the complexity of the hardware used, the operating system and the software components. The interface module according to the present invention fulfills the following requirements: 
   It is space-saving and also suitable for example for C- or top-hat rail mounting in paths or as a portable service and diagnostic device with an accumulator. It is reasonably priced and quite fail-safe, and is also characterized by a more modest power consumption. 
   It is consequently possible to control and monitor devices, to collect diagnostic data, and to directly or automatically respond to error conditions. 
   The automatic monitoring of the components through a function signal in the interface module corresponds to a watchdog function. The function signal is only produced by the components and sent via an existing communication connection when all important applications are properly running. The applications run on the individual components. If the function signal does not arrive after a configurable time interval, it is the task of the interface module to trigger a restart of the component. This may be realized for example by actuating a relay via a power output. 
   It makes particular sense to use the monitoring functionality in buses and trains with built-in infotainment systems where the passengers do not have any direct access to a power-on, power-off or reset switch, and even the vehicle personnel cannot restart the infotainment system during the trip. Through the interface module, the monitoring may be simply connected via LAN or W-LAN or mobile radio to an Intranet or the Internet as the communication network. In a radio-based connection, travelling vehicles may also be reached problem-free in such a manner. The users, i.e., developers, field testers, service technicians, and transportation employees, may interactively access the data stored in the interface module and, depending on the configuration, request further data from the application units. 
     FIG. 1  shows the device according to the present invention as a block diagram. An antenna  2  is connected to an input/output of a transmitter/receiver station  1 . The transmitter/receiver station  1  is connected via a data input/output to a processor  3 , which is connected to a memory  4  via its second data input/output. Through a third data input/output, processor  3  is connected to a bus controller  5  and through a data output, to a circuit breaker  11 . Bus controller  5  is connected to a bus  6  via its second data input/output. Here, bus  6  may be a CAN-bus. A bus controller  7  is coupled to bus  6  also via a data input/output. At the second data input/output, bus controller  7  is connected to a control  8 , which in turn is connected via a data input/output to a display  9  having a display field  10 . 
   The interface module is formed by antenna  2  of transmitter/receiver station  1 , processor  3  and memory  4 . Processor  3  ensures that function verifications of the components connected to bus  6 , such as display  9 , are performed at specified times via bus  6 . The components connected to bus  6  send back their results on the function test to the interface module so that the interface module then sees whether all the components are working flawlessly. If that is the case, a function signal is produced through processor  3  and is then sent via transmitter/receiver station  1  and antenna  2 . However, if an error is detected, processor  3  switches circuit breaker  11 , which interrupts or closes the power supply to display  9 . By switching circuit breaker  11  on or off, display  9  is restarted. A circuit breaker may be allocated here to each component or there may be circuit breakers for groups of components. Instead of a circuit breaker, a command that control  8  and display  9  must perform a restart may also be sent from processor  3  via bus  6 . As a result, a restart triggered by a software command is produced. 
   Instead of a bus, a LAN, W-LAN, mobile radio, serial or parallel interfaces or two-wire lines for the individual components may also be used. For the radio interface, which is realized through antenna  2  and transmitter/receiver station  1 , different communication possibilities are provided. A wireless LAN, W-LAN, mobile radio or radio transmission systems may be used here as well. It is also possible at certain stations to establish a contact-bound communication between the interface module and the communication network. 
     FIG. 2  illustrates how a vehicle having the interface module according to the present invention and antenna  2  is connected to a base station  14  and antenna  13  via a radio channel, base station  14  then establishing the connection to Internet  15 . 
     FIG. 3  shows the sequence of operations on the interface module according to the present invention as a flow chart. In procedure step  16 , the function test of the individual components, such as display  9  with its control  8 , takes place through processor  3  of the interface module via bus  6 . If the interface module sees that this test ran with faults, the components concerned or the component concerned are forced to restart via circuit breaker  11 . This takes place in procedure step  18 . Alternatively, in a faulty test, a reset signal may initially be transmitted to the components concerned in order to trigger a warm start, for example via a CAN-bus connection. If the components concerned are still not functioning correctly after the reset, a restart is forced via the circuit breaker, which is generally known as a cold start. 
   However, if it is detected in procedure step  17  that the function test relates that all components are functioning properly, processor  3  produces a function signal, which is transmitted via transmitter/receiver station  1  and antenna  2  to a base station  14  with its antenna  13  in order to transmit it via Internet  15  to a computer and in this way to document that the components in the vehicle  12  concerned are functioning properly. After a time □t, as in procedure step  20 , the function test is repeated here in procedure step  16 .