Impulsive Noise from the Optional Equipment on In-Vehicle Power Lines

In modern cars, the transmission of control signals between electronic units, sensors and actuators occurs via dedicated wire lines. The advantage of this method of signal transmission is good noise immunity, the disadvantage is the need for branched electrical wiring, the length of which increases as the vehicle control system becomes more complex. In recent years, it has been proposed to use the power wiring of a car instead of dedicated lines. This method of signal transmission is called In-Vehicle Power Line Communication (VPLC). Despite the successes of theoretical studies, it was not possible to implement high-speed VPLC in production vehicles due to the high cost of modems using orthogonal frequency division multiplexing (OFDM). On the other hand, there is a need for inexpensive low-speed communication between devices that can be installed on a vehicle after its sale. In particular, between the electronic units of the car alarm. At a relatively low speed (up to 10 kbps), direct digital signal transmission can be used. The coded digital signal is transmitted through the wiring in the form of a sequence of short pulses. The operation of the signal receiver is significantly affected by impulse noise from standard electronic units. Properties of such pulse noices are well known. But optional equipment (car compressors, vacuum cleaners, inverters ...) can also be a source of impulse noise. The effect of interference from optional equipment on direct digital signal transmission has hardly been studied. The paper proposes a classification of noise, provides experimental data and statistical analysis of impulse noise from electronic units of cars and optional equipment. A coding algorithm is proposed that ensures the reception of a control signal under conditions of joint action of interference.