Abstract:
An input device in a vehicle and a method for occupant classification, in which an input regarding occupant classification is requested from the driver or some other user. This input is compared with an automatically produced occupant classification, and depending on this comparison a warning is issued, an occupant classification is communicated to the control unit for restraining devices, and/or a new input is requested.

Description:
FIELD OF THE INVENTION 
   The present invention is directed to an input device in a vehicle and a method of occupant classification. 
   SUMMARY OF THE INVENTION 
   The input device in a vehicle according to the exemplary embodiment and/or exemplary method of the present invention for occupant classification may have the advantage that the automatic occupant classification is improved and optimized by an input from the user. This enables an object or an occupant on a particular vehicle seat to be better protected. It is designed to prevent erroneous classifications by the interior sensing system. The data entered by the driver is stored in the control unit. The possibility of inputting the information about the occupant classification is combined here with an occupant classification system. 
   If the interior sensing or occupant classification system recognizes that there is an object on the particular seat, for example via seat occupancy recognition by a seat mat, the driver is asked to input certain information. If this input is provided by the driver, the occupant classification system only checks the plausibility of the input, and may issue a warning that the input is not plausible. However, it is also possible for the driver&#39;s input to be used to check the plausibility of the occupant classification produced with the occupant classification system. 
   The exemplary input device according to the present invention is combinable with a control unit for restraining devices, to which the occupant classification is transmitted, so that adaptive activation of the restraining devices may be provided in the event of a crash. 
   Depending on the comparison of the entered occupant classification and the automatically determined occupant classification, another request for input may be issued, since an erroneous input has presumably been made. But if the input was recognized as plausible, a third occupant classification derived from the entered occupant classification and the automatically determined occupant classification is communicated to the control unit. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows a block diagram of the input device according to the present invention. 
       FIG. 2  shows a flow chart of the exemplary method for occupant classification according to the present invention. 
   

   DETAILED DESCRIPTION 
   Increasingly there is intent to introduce an occupant classification system in vehicles, in order to enable adaptive activation of the restraining devices. This is intended to prevent unnecessary deployments, but also to reduce the risk of injury occurring from restraining devices such as airbags. 
   According to the exemplary embodiment and/or exemplary method of the present invention, the driver for example is now also asked to input information for occupant classification. This is intended in particular to prevent erroneous classifications by the interior sensing system. The user&#39;s input is simplified by appropriate supporting information. For example, a display shows what classes the user may enter. 
   One possibility is to define four classes. Class 1 covers a child seat and persons weighing up to 30 kg. The result of this is that an airbag is not deployed for this seat. Class 2 covers persons weighing 30-60 kg. Here a light airbag is deployed. Class 3 covers persons weighing 60-90 kg. Here a standard airbag is deployed. The fourth and last class covers persons over 90 kg. Here a powerful airbag is needed. The user will therefore specify one of the four classes, in order to classify the occupants on the individual seats. This has the advantage that it makes exact determination of the occupant possible, so that erroneous identifications are avoided. 
   The information that the driver must enter may also be made up of the information “Airbag on” or “Airbag off,” but more detailed information about the exact weight class as indicated above is also possible. A comparison of the entered class and the class determined automatically using the occupant classification system makes it possible to check the plausibility of the input. If a user specifies Class 1 and the occupant classification system also detects Class 1, then plausibility exists and Class 1 is communicated to a control unit as the occupant classification. If a user specifies Class 1 but the occupant classification system detects Class 2, then plausibility does not exist; but Class 1 is communicated to the control unit, since Class 1 is the most sensitive class, i.e., the one that precludes deployment of an airbag. The same is also true if the occupant classification system detects Class 3 or 4. 
   However, if a user specifies Class 2 and the occupant classification system detects Class 1, then plausibility also does not exist; but in this case Class 2 is accepted and communicated to the control unit, since the user did not choose Class 1, i.e., the class that means “Airbag off.” The same applies to the automatically detected Classes 2, 3 and 4. 
   However, if a user specifies Class 3 and the occupant classification system detects Class 1, then here too priority is given to the input and Class 3 is communicated. The same applies to all other classes detected by the occupant classification system. The case is exactly the same when Class 4 is entered. The classification “Airbag on” or “Airbag off” also gives priority to the input. A combination of the classifications “Airbag off” and “Airbag on” also gives priority to the input, Class 1 always being detected in the case of “Airbag off,” and in the case of “Airbag on” at least Class 2 is detected, and otherwise the class detected by the automatic occupant classification system. 
     FIG. 1  shows a block diagram of the input device according to the present invention. An input device  1 , which may have tactile input or acoustic input, is connected to a signal processor  2 , which processes the inputs to input device  1 . These processed signals from the input device are then communicated to a processor  3 . Processor  3  is connected via a first data output to a signal processor  4 , which drives a display  5  having a display field  6 . Processor  3  is connected via a second data output to an audio control  7 , which controls a speaker  8 . Via a third data output processor  3  is connected to an airbag control unit  10 , in order to communicate the detected occupant classification to control unit  10 . Via a data input/output unit, processor  3  is connected to an occupant classification system  9 , which has sensors in the individual seats or in the interior of the passenger compartment in order to detect the individual objects on the seats. Alternatively, the processor  3  may be integrated into airbag control unit  10 . 
   The flow chart in  FIG. 2  explains the exemplary method according to the present invention. In method step  11  the input device is turned on. In method step  12  control unit  10  is initialized with Class 1 for the individual seats, so that no airbag is activated. In method step  13  occupant classification system  9  is queried as to whether the individual seats are occupied. Processor  3  carries out this procedure according to the exemplary method of the present invention. If none of the seats is occupied, the procedure jumps back to method step  12 . However, if it was determined in method step  13  that at least one of the seats is occupied, then in method step  14  Class 2 is assumed for the occupied seat, i.e., that the seat is occupied and will receive minimal protection. This is communicated to airbag control unit  10 . A recursion counter n is reset to zero in method step  14 . 
   In method step  15  an input request is sent to the driver. Display  5  and also speaker  8  are used for this purpose. In method step  16  there is a specified wait period to see whether the driver will make an entry. In method step  17  a check is then performed after this time period has elapsed to see whether the input was made. If this input was made, the procedure jumps ahead to method step  23 . In method step  23  the entered class is stored. In method step  24  the class determined by the occupant classification system is queried. In method step  25  the comparison of the entered class and the class determined by occupant classification system  9  is performed. The result of the comparison is the plausibility, as explained above. 
   If plausibility was not detected, in method step  27  a warning signal is issued, for example using speaker  8 . In method step  28  the recursion counter is incremented. In method step  29  the entered class is communicated to the airbag control unit. In method step  30  the occupant classification system is queried, and in method step  31  it is determined whether the particular seat is occupied. If the seat is occupied, the procedure jumps back to method step  15 . If the seat is not occupied, the procedure jumps back to method step  12 . 
   However, if it was determined in method step  17  that no input was made, then in method step  18  a warning signal is issued. In method step  19  the classification by occupant classification system  9  takes place. In method step  20  the class so determined is defined as the class to be used further. In method step  21  this class is communicated to control unit  10 . In method step  22  a check is performed to determine whether the seat is occupied. If so, the procedure jumps back to method step  21 ; if not, it jumps to method step  12 . 
   If it was determined in method step  25  that the entered class and the class determined by occupant classification system  9  are plausible, the procedure jumps to method step  26 . The class to be transmitted to control unit  10  is decided from the entered class and the determined class, as described above. The procedure then jumps to method step  21 , in order to communicate this determined class to airbag control unit  10 .