Elektrisk servostyrning för fyrhjulingar
This thesis is a feasibility study for a future product development project. The purpose ofthis project is to evaluate the possibilities and difficulties associated with the design of anelectric power assist servo for all terrain vehicles (ATVs). The project has been carriedout in collaboration with Nira Control AB. Nira designs and manufactures electric andelectro mechanic products mainly for the motor sport market segment.Nira Control AB is developing a fuel injection system for a new line of large ATVs oncommission. To be able to compete with manufacturers like Yamaha and Honda thecommissioner should be able to offer optional power assist steering. Hence, Nira islooking into designing a hard- and software concept for an electric power assist servosteering.The focal point of the project has been the evaluation of the constituent parts and theirinteraction. Given that the target product should be suitable for production, no expensiveor hard to find components were used, with one exception. To conserve time, the servoassembly for the demonstration platform was purchased as a spare part from Yamaha.After theoretical studies and simulations a demonstration platform was designed. Thisplatform employs a microcontroller and its peripherals to demonstrate the functionality ofthe assist servo and the overall feasibility of the concept.The completed studies have had a positive outcome. It has been shown that it is possibleto design a functioning servo assist setup without special expertise or great difficulty. Thestudy also shows that there are many factors to consider during a project of this type andfurther suggests possible improvements for the demonstration platform.