Intelligenta Switchar
This master thesis has been carried out on behalf of Stoneridge Electronics AB and is an investigation ofhow intelligent switches can replace the traditionally used direct controlled switches. The concept ofintelligent switches is that the switches contain electronic identification components which, by connectingthem to a network, give the same function independent of the location of the switch. This infers anincreased flexibility and configurability which can be a great advantage in development, production andcustomization in the commercial vehicle industry. Especially in the current situation when commercialvehicle manufacturers provides more and more functions and dashboard configurations.LIN (Local Interconnect Network) is a network protocol introduced in 1999. It is a simpler and lower costcomplement to CAN (Controller Area Network) and is adapted for applications where the demands forbandwidth are lower, for example reading sensors and switchers. This made LIN a natural network choicefor this thesis and the investigation could focus on switch identification methods. Two identificationmethods are presented in this thesis, resistance encoding and 1-Wire. They are investigated and discussedon the basis of a set of predetermined demands such as response time and the amount of unique switchesthe method can distinguish.The practical part of this thesis include the design of a prototype which main purpose is to act as ademonstration platform for intelligent switches but also for technique evaluation i.e. serve as a base forresponse time measurements. The prototype is based on a LIN network with three nodes and theidentification method used is resistance encoding. In resistance encoding every switch is provided with aunique resistance and the switches position and status are identified with AD-conversion.