Analysis on the Correlation Between Vehicle RFI and Component EMI Tests Using BCI and RI Methods

Even though component Electromagnetic Interference (EMI) test has been passed for a product, it often happens that the actual vehicle Radio Frequency Interference (RFI) test fails. Because of the different result of tests, many vehicle and component makers should spend more time for the later works, and consequently cost of the product and the vehicle development increase. There are several types of difference between component EMI and vehicle RFI. First is the difference of level between them. Second is the difference of resonance frequency. Third is the difference of the specification. The last is no types of component EMI tests matches to the vehicle RFI test result. In this paper, we introduced Radiated Immunity (RI) and Bulk Current Injection (BCI) methods to analyze the difference between component EMI test and vehicle RFI test. Using these methods, we could have analyzed the difference between each component EMI level and the vehicle RFI level, and we expect that vehicle and product makers can reduce the development schedule and cost at the same time by introducing the proper component EMI specification.