Val och implementering av en varvtalssensor i växellådan på ett elektrifierat bandvagn

Sammanfattning: This project was carried out in cooperation with the company BAE Systems Hägglunds AB in Örnsköldsvik, which produces vehicles for military as well as civil use. There is an ongoing project at BAE researching bandwagons using electricity as their source of energy, codename SIRIUS, and this investigation is part of it. The purpose of this thesis is to investigate how to efficiently measure differences in rotational speed of affected gears inside of the gearbox in the vehicle. This is to enable efficient gearshift while the vehicle is in motion. Initially, different types of sensors are presented along with how they are used in diverse applications. The most relevant type of sensors is using technology based on electromagnetism. Calculations are then performed to control the accuracy of the sensor along with the ideal number of magnetic nodes based on the data sheet provided by the manufacturer. These parameters are then used to create the optimal amount of measuring nodes on the constructed disc that will beimplemented. Beyond that the difference in rotational speed between the main axis and the shifted gear were calculated to see how large difference in rotational speed the gears can handle during gearshift. The chosen sensor is based on the Hall effect and is called mini-HA-P Sealed made by BOSCH. The demands to be able to measure accurate data within the harsh environment of a gearbox are fulfilled by the sensor. A concept for mounting the sensor on the gearbox was developed using CAD focusing on ease of maintenance and other outside factors affecting correct measurement data such as stray magnetic fields, vibrations, and large temperature changes. Drawings of two different components were created to aid in this measuring and minor changes to the gearbox were carried out. The project also creates new aspects of research that require further investigation, for example flow analysis, material analysis and a way to convert the excess energy from retardation when the rotational speed is decreased.