Automotive Electromagnetic Compatibility (EMC)

Electromagnetic Compatibility (EMC) has become an increasingly critical attribute for motor vehicles as the content and functionality of vehicle electronics continues to increase. EMC has long been recognized and managed as a critical performance parameter in the design of consumer appliances, and commercial and military electronic equipment. Similar design discipline is being gradually applied in the automotive industry through the development and implementation of systematic design and measurement techniques. Even though typical customers do not consciously include EMC in the purchasing decisions, non-robust EMC designs can have a negative impact on the customers' perception of quality through poor radio/tape performance and/or faulty operation of electronically controlled functions. Some aspects of vehicle's EMC performance may be controlled through Government regulations.

This paper defines different aspects of EMC performance that are relevant to motor vehicles, supported by some examples of observed consequences of non-robustness on vehicle operation. This is followed by a brief discussion of design approaches and practices to achieve satisfactory performance. Some of the existing regulations and trends are also discussed. The paper concludes with a brief description of test procedures and facilities required to verify EMC performance.