Identifying motor vehicle starting circuit microcontroller card by including before commencement of normal cycle pulses which are easily identified but do not cause any contactor operation

摘要

A microcontroller in the form of a card controls the power supplied to a motor vehicle starting contactor by pulse width modulation such that there is high initial power (R1), moderate continuation (R2), increasing closing power (R2,R1), and high retaining power (R1). This normal cycle is preceded by an identification phase (R4) consisting of pulses which may be easily identified by an oscilloscope