The suppression technique of electromagnetic interference of motor vehicle

Electromagnetic interference (EMI) from motor vehicles and their effect on broadcast radio and television were studied as early as 1944. Their original effect was significantly reduced by the early 1960s. Today, the use of advanced electronically controlled vehicles are widespread. Most of the vehicular functions are now controlled by microprocessors that send electrical instructions to other devices which operate the engine and transmission as well as the implements the machine was designed to use. Ignition noise and vehicular microprocessor controlled system noise are interfering with mobile communication services and devices such as computers. In China, the study of EMI from vehicles began in the 1970s. Due to the lack of enforcement of the rules and regulation, vehicular electromagnetic emission is now interfering with mobile communication, broadcast radio and other devices. This paper describes vehicular EMI and the suppression technique for automobile EMI