Electromagnetic Compatibility Issues in Automotive Communications

Electromagnetic Compatibility Issues in Automotive Communications

Todd H. Hubing (Clemson University International Center for Automotive Research, USA)
DOI: 10.4018/978-1-60566-338-8.ch003
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Engineers and engineering managers involved in the design of automotive electronic systems need to have a basic familiarity with electronic noise and the electromagnetic compatibility (EMC) issues that influence the design and the performance of automotive systems. When EMC issues are addressed early in a product’s design cycle, the resulting designs often meet all EMC requirements without significant cost or performance problems. EMC problems detected after a product has been built and tested, on the other hand, can be very difficult and costly to fix. This chapter reviews automotive EMC requirements and discusses the design of automotive electronics for EMC. The objective of the chapter is to provide non-EMC engineers and engineering managers with basic information that will help them recognize the importance of designing for electromagnetic compatibility, rather than addressing electronic noise problems as they arise.
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Cispr 12

According to the introduction in the standard, “CISPR 12 has been developed to serve the road vehicle and related industries with test methods and limits that provide satisfactory protection for radio reception.” It is designed to protect broadcast receivers operating at frequencies between 30 MHz and 1 GHz from unintentional electromagnetic emissions from a vehicle located 10 meters or more away. The standard applies to automobiles, trucks and boats, but not to aircraft or trains.

The test procedure calls for the vehicle to be parked in a flat area free of buildings, trees or other objects that might reflect electromagnetic fields, as illustrated in Figure 1. Electromagnetic emissions from the vehicle are measured with an antenna located 10 meters away. Measurements are made with the vehicle’s engine idling at 1500 RPM, and also with the engine off but the rest of the vehicle powered on. Electric propulsion vehicles are measured on a dynamometer. For hybrid vehicles, a separate test is performed for each form of propulsion.

Figure 1.

CISPR 12 Radiated emissions test configuration


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