Predicting vehicle-level radiated EMI emissions using module-level conducted EMIs and harness radiation efficiencies

This paper proposes simple yet accurate empirical strategies, to characterize the emission coefficients of wire harnesses in a complicated system. Then, combine these with measured conducted electromagnetic interference (EMI) currents, vehicle-level radiated noise can be predicted. This approach conceptually separates complicated radiated emission issues to two parts, one associated with conducted EMIs and the other related to radiation efficiencies. This means that the teams can predict system-level emission from known subsystem-level characteristics, or complicated system-level emissions can be traced down to simpler subsystem-level issues. To explain the approach, thorough analysis is included in this paper, proven by solid test results after applied on a prototype hybrid electric vehicle.