The Use of Power Line Communication Technology for Electronic Relays of Car Alarms

The growing number of hijackings with the use of special technical equipment makes actual the development of new types of electronic relays that disconnect an automobile circuits and prevent hijacking. It is promising to create relays that work using the Power Line Communication technology and receive control signals from the main module of car alarms by car power wiring. Such relays are difficult to detect and deactivate. Famous publications on the PLC technology are devoted to the creation of devices controlled from the main electronic unit of the car. They involve the use of blocking filters built in the power wiring of the car, which is unacceptable when installing anti-theft systems, which are optional equipment. In the presented article a method of digital signal transmission is proposed, an electrical model of wiring is developed and the results of its verification are presented. To increase the probability of receiving a code signal on the background of impulse noise, it is proposed to install floating reference levels of the internal comparator of the microcontroller.