Background Information
Large amounts of CAN-data (vehicle information) were collected in the beginning of the project to be able to select such information that was interesting. The data was assorted into
two different categories; Background data and Event data. The background data is
continuously collected every 30 seconds and consists of information such as temperature,
precipitation and position. The Event data is information that is sent only when one of the
safety systems such as the ABS or the Anti-skid systems in the car is activated.
Several test drives were conducted on slippery conditions in order to understand how the
activating of safety systems in the cars work and where their threshold values lies, i.e. how
should one drive in order to activate the safety system. This was part of the background in the
development of the technical system design used in the cars as well as in the central database.
The system design was divided into two communication channels; the SMS-design which
sends text messages through the mobile telephone network and the GPRS channel, where you
need a GPRS modem, which sends data in bits.