US 5,847,589 AGranted

Pulse signal generating device

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsTakashi Arai, Hiroyuki Kuki, Hiroaki Ue

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Abstract

Pulse signal generating device includes a duty cycle calculator for calculating a target duty cycle at predetermined intervals, a duty cycle comparator for making a comparison between the target duty cycle calculated by the duty cycle calculator and a current duty cycle of a pulse signal being currently output from the device, and a pulse signal adjuster. The duty cycle comparator determines whether the target duty cycle has presented a variation (increase or decrease) from the current duty cycle by over a predetermined value. Once the duty cycle comparator detects that a difference between the target duty cycle and the current duty cycle is more than the predetermined value, the pulse signal adjuster adjusts the pulse signal, using a pulse rise point immediately before the detection as an adjustment reference point, in such a manner that the pulse signal assumes a duty cycle corresponding to the target duty cycle.

Claims7

Dependent claims

A pulse signal generating device comprising:

a duty cycle calculator for calculating a target duty cycle at predetermined uniform intervals;
a duty cycle comparator for making a comparison, at said predetermined uniform intervals, between the target duty cycle calculated by said duty cycle calculator and a current duty cycle of a pulse signal being currently output from said device, said device therein outputting the pulse signal with the target duty cycle for a preset period from a pulse rise point following the comparison, said predetermined uniform intervals being shorter than the preset period of the pulse signal;
and
a pulse signal adjuster for, when a detection is made via said duty cycle comparator that a difference between the target duty cycle and current duty cycle is more than a predetermined value, adjusting the pulse signal being currently output from said device, using said pulse rise point immediately before the detection as an adjustment reference point, in such a manner that said pulse signal being currently output from said device assumes a duty cycle corresponding to the target duty cycle.

1 more element

Dependencies are inferred from the claim text.