Title:
AUTOMATIC CONTROL METHOD
Document Type and Number:
Japanese Patent JPH01295302
Kind Code:
A
Abstract:
PURPOSE:To stably maintain the present output by sending continuously the preceding arithmetic outer of a DDC (direct digital control) device until an input error is recovered in the prescribed timing against the controlled variable supplied to the DDC device from a detector in case the input error is detected out of the DDC device. CONSTITUTION:The controlled variable of a control subject which is taken out of a detector is supplied to a DDC device 5. Thus the deviation of the controlled variable is obtained against the set value and at the same time such an operation signal that eliminates said deviation with execution of an appropriate arithmetic operation is transmitted to an operating device. Then the operating device works based on said operating signal to control the control subject. The device 5 performs the control actions every prescribed timing and also performs the actuation to the control subject every said timing even with the disturbance occurred at the control subject. If an input error is detected out of the device 5, the subsequent arithmetic operations are inhibited and the preceding arithmetic output is sent to the operating device every prescribed timing as the arithmetic output of this time. Thus the present state of the control subject is maintained.
Inventors:
HAYASHI HIDEYO
Application Number:
JP12669688A
Publication Date:
November 29, 1989
Filing Date:
May 23, 1988
Export Citation:
Assignee:
NISSIN ELECTRIC CO LTD
International Classes:
G05B9/02; (IPC1-7): G05B9/02
Attorney, Agent or Firm:
Ryutaro Fujita