| 摘要 |
PROBLEM TO BE SOLVED: To reduce, when proportional operation quantities are to be obtained from deviations, any deviation remaining on account of the presence of a dead zone.SOLUTION: An operation quantity control unit 16 determines for each control period whether or not a deviation is in a dead zone, where a proportional operation quantity calculated by a proportional controller 15 is 0 in spite of the fact that a deviation calculated by a subtractor 14 is not 0. If the deviation is not in the dead zone, the proportional operation quantity is outputted via a change-over switch 30, and the accumulated value is reset to 0. If the deviation is in the dead zone, a unit value is added to or subtracted from the accumulated value according to the polarity of the deviation. When the absolute accumulated value reaches a threshold, the accumulated operation quantity is set to a positive or negative operation value according to the polarity of the accumulated value and outputted via the change-over switch 30 to reset the accumulated value to 0. |
