Elektrisk servostyrning för fyrhjulingar

Sammanfattning

This thesis is a feasibility study for a future product development project. The purpose of

this project is to evaluate the possibilities and difficulties associated with the design of an

electric power assist servo for all terrain vehicles (ATVs). The project has been carried

out in collaboration with Nira Control AB. Nira designs and manufactures electric and

electro 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 on

commission. To be able to compete with manufacturers like Yamaha and Honda the

commissioner should be able to offer optional power assist steering. Hence, Nira is

looking into designing a hard- and software concept for an electric power assist servo

steering.

The focal point of the project has been the evaluation of the constituent parts and their

interaction. Given that the target product should be suitable for production, no expensive

or hard to find components were used, with one exception. To conserve time, the servo

assembly for the demonstration platform was purchased as a spare part from Yamaha.

After theoretical studies and simulations a demonstration platform was designed. This

platform employs a microcontroller and its peripherals to demonstrate the functionality of

the assist servo and the overall feasibility of the concept.

The completed studies have had a positive outcome. It has been shown that it is possible

to design a functioning servo assist setup without special expertise or great difficulty. The

study also shows that there are many factors to consider during a project of this type and

further suggests possible improvements for the demonstration platform.