Method for controlling electric actuator and apparatus for the same

A control apparatus for controlling an electric actuator in which rotary motion of a driving force-transmitting shaft energized by a motor is converted into rectilinear motion to displace a displacement member in accordance with an action of said rectilinear motion, said control apparatus comprising:

• a plurality of memory groups each of said memory groups being composed of a plurality of memories for storing positional information on said displacement member;
• a starting point memory provided in one of said memory groups, for storing a starting point position to restore said displacement member to a starting position;
• means for judging whether or not said starting point memory is selected, wherein said displacement member is displaced toward said starting point position if said starting point memory is selected;
• and
• a starting point-detecting switch for detecting that said displacement member has been moved to a starting point disposed at one end of said electric actuator, wherein said displacement member is stopped when a signal is outputted from said starting point detecting switch.

A control apparatus for controlling an electric actuator in which rotary motion of a driving force-transmitting shaft energized by a motor is converted into rectilinear motion to displace a displacement member in accordance with an action of said rectilinear motion, said control apparatus comprising:

• a starting point-detecting switch for detecting that said displacement member has been moved to a starting point disposed at one end of said electric actuator;
• a displacement limit-detecting switch for detecting that said displacement member has been moved to another end of said electric actuator opposite from said one end;
• a switch input unit connected, respectively, to said starting point-detecting switch and said displacement limit-detecting switch;
• and
• a malfunction detection switch connected to said switch input unit, for detecting any abnormality caused in said electric actuator,
• wherein said electric actuator is controlled on the basis of signals inputted from said starting point-detecting switch, said displacement limit-detecting switch and said malfunction detection switch into said switch input unit.

A control apparatus for controlling an electric actuator in which rotary motion of a driving force-transmitting shaft energized by a motor is converted into rectilinear motion to displace a displacement member in accordance with an action of said rectilinear motion, said control apparatus comprising:

• a starting point-detecting switch for detecting that said displacement member has been moved to a starting point disposed at one end of said electric actuator;
• a displacement limit-detecting switch for detecting that said displacement member has been moved to another end of said electric actuator opposite from said one end;
• a switch input unit connected, respectively, to said starting point-detecting switch and said displacement limit-detecting switch;
• a positive direction movement memory and a negative direction movement memory;
• and
• means for judging whether one of said positive direction movement memory or said negative direction movement memory is selected, wherein said displacement member is displaced in a direction to make separation from said starting point position if said positive direction movement memory is selected, and said displacement member is displaced in a direction to approach said starting point position if said negative direction movement memory is selected,
• wherein said electric actuator is controlled on the basis of signals inputted from said starting point-detecting switch and said displacement limit-detecting switch into said switch input unit, and
• wherein said displacement member is stopped if one of a signal from said displacement limit-detecting switch or a signal from said starting point-detecting switch is input to said switch input unit.