| 摘要 |
PURPOSE:To control with higher resolution without increasing the output frequency of a tachometer generator by comparing the output of a voltage source with the voltage of an AC signal having speed information of a vehicle and correcting the error output by the compared output. CONSTITUTION:The output of a tachometer generator 2 is amplified by a voltage control amplifier 3 until becoming the prescribed amplitude. Comparators 11, 12 compare the output of the amplifier 3 with the outputs 6a, 6b of upper and lower output terminals of a programmable voltage source 6. The outputs of the comparators 11, 12 are supplied to a channel selector 5 as a channel updating signal, thereby altering the output voltage of the voltage source 6. On the other hand, a counter 15 counts the output of an oscillator 14. The counted value of the counter 15 is read out by the trigger signal from the selector 5, calculated with the counted value of previous time to apply an error signal to a latch 22. The error signal is corrected by a deviation from the normal value at the generating time of the trigger signal. |
