Method of regulating an excitation current of an inductor of a m

Details Method of regulating an excitation current of an inductor of a m Method of regulating an excitation current of an inductor of a m

1991-10-09

1994-03-22

Peckman, Kristine L.

Electricity: single generator systems

Automatic control of generator or driving means

Voltage of generator or circuit supplied

320 64, H02J 724

Patent

active

052967980

ABSTRACT:
In a method for regulating the excitation current of an inductor of a motor vehicle alternator, the alternator is of the kind comprising a rectifier bridge supplying a rectified voltage (which is to be regulated) having a low frequency fluctuation of variable amplitude with a high frequency waveform of constant amplitude superimposed on it, the rectified voltage Ub+ being thus a periodic voltage, each cycle of which comprises a first alternate period, during the course of which a voltage is applied to the inductor of the alternator, and a second alternate period, during which no voltage is applied to the inductor. The method comprises the steps of initiating measurement of the rectified voltage during an intermediate part of one of the two alternate periods; evaluating the measurement, over a predetermined time sampling break, by sampling, that is to say by carrying out successive iterative measurements; comparing the measured value of the rectified voltage with a calculated theoretical value thereof; and deducing from that comparison the durations of the alternate periods for the next following cycle.

REFERENCES:
patent: 4555657 (1985-11-01), Kato et al.
patent: 4670704 (1987-06-01), Maehara et al.
patent: 4789817 (1988-12-01), Asakura et al.
patent: 4920308 (1990-04-01), Edwards et al.
patent: 5105143 (1992-04-01), Marumoto et al.

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