The voltage or rational signal is a standard signal for automotive applications.
The main advantage of the rational signal is to be energy efficient and allow a simple and economical realization of sensors.
The live signal is typically in the 0..5 V standard with three-wire transmission. It is defined as rational because the measurement signal is dependent on the power voltage: the value of the measured signal is in fact given by the ratio (made by the control equipment) between the measured voltage and the power voltage.
Advantages of rational sensors:
Disadvantages of rational sensors: