Electrical Model of In-vehicle Power Line Communication System Based on Direct Digital Signal Transmission

The technology for transmitting data through vehicle power lines (VPLC) allows to reduce the number of wired connections, reduce the weight and cost of wiring. However, the implementation of high-speed data transmission through the use of sophisticated signal modulation and coding methods involves the use of expensive modems. As a result, VPLC technology has not yet found practical application in the automotive industry. On the other hand, VPLC technology can be used to control additional equipment, for example, electronic relays of car alarms. The wholesale price of such relays should not be higher than a few dollars. In these conditions, the problem can be solved using direct digital signal transmission. The implementation of this method requires the creation of a relatively low-frequency model, capable of adequately displaying the process of transmitting a pulse signal through the car wiring. This paper considers the principles of forming a model including a transmitter, a battery model, and a model of wired connections. The influence of the wiring parameters, the transmitter and the receiver on the propagation process of the pulse signal is estimated at a qualitative level.