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The New EU Automotive EMC Directive 2004/104/EC

The New EU Automotive EMC Directive 2004/104/EC

to 2-GHz frequency band with a minimum of 25 V/m at any specific frequency point. Vehicle radiated immunity testing in the new directive refers to the standard ISO 114516 for free field test set-up, currently the test method is explicitly described in 95/54/EC. Although the 95/54/EC test method is similar to ISO 11451-2 for free-field testing, the ISO standard also allows Transmission Line System TLS testing of whole vehicles and consequently the new EU directive could also be interpreted to allow TLS testing for whole vehicles Figure 2.

Figure 2. TLS testing of whole vehicle radiatd immunity photo courtesy of ETS-Lindgren.

Another addition to the new directive is the use of BCI on-vehicle in accordance with ISO 11451-4, for the complete 20-MHz – 2-GHz frequency range where the vehicle size exceeds 12 m long and/or 2.6 m wide. This is potentially a significant cost saving but availability of BCI probes up to 2 GHz may in practice limit the up take of this test option.

The vehicle test conditions and fail criteria are explicitly tabulated in 2004/104/EC making the test engineers job easier and the directive more readable.

The test signal modulation in 95/54/EC is amplitude modulated AM only at 80 depth with a 1-kHz modulation frequency. This is retained in the 2004/104/EC for 20 MHz to 800 Mz. Above 800 MHz pulse modulation PM is used with a pulse width of 577 μs and a period of 4.6 ms. This PM scheme suitably represents the coding commonly used by mobile telephony and is a long overdue addition to this EU directive.

Only vertical polarization is specified for whole vehicle radiated immunity testing in 2004/104/EC, this is consistent with TLS testing but a departure from the existing EU automotive EMC directive test requirement.

INSTALLATION OF RADIO EQUIPMENT ON VEHICLES

The vehicle manufacturer is required to make a statement on the requirements for installation of RF transmitters in their vehicles as part of their application for approval certification to 2004/104/EC.

This can potentially have an impact on restricting the equipment type and installation location of aftermarket radio equipment. As this is a statement on their approval documentation it is not necessarily obvious to either user or aftermarket suppliers although it is likely to be repeated in the owners handbook and could be a potential bone-of-contention should a problem come to light in service.

For example the manufacturer may state use of mobile telephony with installed car-kits with an external antenna only, this would mean that anyone using a mobile phone without an installed kit whilst sat in the vehicle would be invalidating the vehicles certification? Should an unexpected event occur e.g., airbag deployment during such a situation the manufacturer could claim this is a specific exclusion and that due diligence has been demonstrated? It is possible that this may come into conflict with local product safety regulations and may ultimately not provide an adequa

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