Establishment of Technology for Identification of Electromagnetic Noise Sources in Electric Power Steering Systems

摘要

In this research it has been shown that the sources of electromagnetic noise in electric power steering (EPS) systems can be identified by measuring the distribution of magnetic field strength on the substrate of the electronic control unit (ECU). As the first step in the electromagnetic noise source identification process, the distribution of magnetic field strength on the ECU substrate was mapped by means of substrate noise visualization apparatus. Subsequently, the measured strength pattern was overlaid on the map so as to estimate the sources of electromagnetic noise, whereupon corrective measures were provided. It was confirmed that the overall noise radiation from the system was reduced. As the establishment of technology for identification of electromagnetic noise sources would do away with trial-and-error processes to counter electromagnetic noise, it is expected that such technology will help to improve efficiency in ECU development.