Title:
【発明の名称】減少させられた位相損失を示す標本化データ制御系
Document Type and Number:
Japanese Patent JPH06511333
Kind Code:
A
Abstract:
An automatic digital control system includes a proportional integral derivative (PID) compensator in which the digital differentiator portion, with its associated zero-order hold, is implemented according to an algorithm that reduces phase loss as a function of frequency. The digital differentiator is based only on a present error sample so that the output of the digital differentiator (with its ZOH) is made to resemble an amplitude-balanced step function (i.e., a doublet) during a given sample period T. The step transition occurs at one-half of the period (i.e., at T/2). Another embodiment further reduces phase loss by confining the output waveform of the differentiator to some fraction of the total sampling period. During the remaining portion of the sampling period the digital differentiator (again, with its associated ZOH) is forced to some desired reference level.
Inventors:
Bourke, Randall Shii
Chase, Scott Yee
Hargarten, James W
Chase, Scott Yee
Hargarten, James W
Application Number:
JP50169792A
Publication Date:
December 15, 1994
Filing Date:
June 26, 1992
Export Citation:
Assignee:
Maxter Corporation
International Classes:
G05B21/02; (IPC1-7): G05B21/02
Attorney, Agent or Firm:
Masaki Yamakawa (5 outside)