Electrical circuit for fuel heater of filter device used in vehicle, has measurement circuit that is arranged between control current circuit and load current circuit to measure measurement signal in control current circuit

摘要

The electrical circuit has a relay which is arranged in a control current circuit and a load current circuit. A measurement circuit is arranged between the control current circuit and the load current circuit to measure a measurement signal (Vmess) in the control current circuit. The operability of the relay is detected in dependence upon the measurement of the measurement signal in the control current circuit. An independent claim is included for a method for judging an operability of the relay of electrical circuit.