Title:
POSITION CONTROLLER
Document Type and Number:
Japanese Patent JPS5837708
Kind Code:
A
Abstract:
PURPOSE:To keep the accuracy of position control for a long time stably, by performing the position control of a body to be controlled taking an output of a position detector as a reference value, when a relative needle position has consecutive zero state for a prescribed time or longer. CONSTITUTION:A power supply detection circuit 303 provides an output for a prescribed time after the application of power supply. A switching circuit 301 transmits an initial value R0 to a latch circuit 302 during this output and gives an output of an A/D converter 31 to the latch circuit 302 during the stop of the output. The initial value R0 is equal to a value A/D-converting an output value of a variable resistor 2 at the time when a needle 11 is fully closed. The latch circuit 302 receives an output of the detection circuit 303, stores the output value of the swithing circuit 301 just before, i.e. the R0 and takes the value as a reference value at the time when the needle 11 is fully closed. An operation circuit 32 operates a relative needle position and applies the result to the addition circuit 33. The addition circuit 33 outputs the sum of the output values of the circuits 32 and 302 to a comparison circuit 34 as an objective needle position.
Inventors:
ISHII MITSUAKI
MATSUMURA HIROMI
MATSUMURA HIROMI
Application Number:
JP13646581A
Publication Date:
March 05, 1983
Filing Date:
August 28, 1981
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G05D3/12; F02D21/08; F02M25/07; G05D3/20; (IPC1-7): F02D21/08; F02M25/06; G05B19/18
Attorney, Agent or Firm:
Masuo Oiwa