Door operation control apparatus
AssigneeHitachi, Ltd.
InventorsShigeru Matsuoka, Takeshi Tokunaga, Seiji Yonekura, Koji Yamauchi, Mitsuo Suzuki
Life of this patent
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Abstract
A motor for driving a garage door is controlled by a control unit, which counts the time required for the garage door to move between an upper limit switch and a lower limit switch. The control unit sets a comparison reference time on the basis of the time thus counted, and controls the motor in such a manner that the motor driving does not continue for a period of time longer than the comparison reference time.
Claims12
A door operation control system comprising a door operating device including a driving unit for driving a door and connector means for connecting said driving unit to said door, and a control unit for issuing a predetermined command signal to said door operating device to control movement of said door, said control unit comprising counter means for counting the time of door operation, section detector means for counting the time of door movement from one end to the other end of a specified section of travel thereof, memory means for storing the count detected by said section detector means, means for producing a comparison reference value which is determined as a function of said count stored in said memory means, and means for comparing said count detected by said counter means with said comparison reference value and providing a command signal in the form of a door operating condition control signal to said door operating device when the count thereof exceeds said comparison reference value.
A door operation control system comprising a door operating device including a driving unit for driving a door and connector means for connecting said driving unit with said door, and a control unit for issuing a predetermined command signal to said door operating device to control movement of said door, wherein said control unit comprises counter means for counting the door operation time, section detector means for counting the time of door movement from one end to the other end of a specified section of travel thereof, memory means for storing the count detected by said section detector means, means for setting a fixed reference value and a fixed set value, each being longer than a value representing the normal door movement time through said specified section of travel by a predetermined amount, means for producing a comparison reference value which is determined as a function of said count stored in said memory means, means for producing a set reference value which is determined as a function of said fixed reference value, means for comparing said count detected by said counter means with said comparison reference value or said set reference value whichever is larger than the other and providing a command signal in the form of a door operating condition control signal to said door operating device when the count thereof exceeds said comparison reference value or said set reference value, and means for comparing said comparison reference value with said fixed set value and providing a command signal in the form of a door operating condition control signal to said door operating device when the comparison reference value exceeds said fixed set value.
Dependencies are inferred from the claim text.