Controller for an automatic door system
AssigneeNabco Limited
InventorsHisayuki Kanki, Naoki Taguchi, Shinji Michimoto, Kazuhiro Oba
Life of this patent
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Abstract
An automatic door system includes a motor which drives a door to open and close. A CPU operating in accordance with a signal from an encoder operatively coupled to the motor detects the position of the door and prepares and applies a control signal based on the detected door position to a motor drive unit. The motor drive unit alternately drives and brakes the motor. The CPU calculates the speed of the door at a particular door position on the basis of the signal from the encoder and operates to make the door speed equal to the aimed speed for the current door position.
Claims14
A controller for an automatic door system for controlling a motor which operates to open and close a door, comprising:
- a position detecting unit for detecting a position of said door in each door operation and generating a position representative signal representative of the position of said door;
- a motor drive unit causing said motor to produce driving and braking forces;
- and
- a control unit for applying to said motor drive unit a control signal prepared on the basis of said position representative signal;
- wherein said control unit includes output means which develops said control signal for controlling the speed of said door at a position represented by said position representative signal to an aimed speed for that door position;
- and
- said motor drive unit causes said motor to produce alternately a driving force and a braking force in accordance with said control signal.
A controller for an automatic door system for controlling a motor which operates to open and close a door, comprising:
- a motor drive unit for driving said motor;
- and
- a control unit for supplying a PWM signal to said motor drive unit;
- wherein said control unit includes approximating means for producing said PWM signal which causes said door to travel at an increasing speed in an accelerating area and to travel at a high speed in a high speed area following said accelerating area in each of door operation in which said door moves from an opened position of said door to a closed position and door operation in which said door moves from said closed position to said opened position;
- said approximating means making the PWM signal at a transition from said accelerating area to said high speed area in a current door operation approximate to the PWM signal in said high speed area in the immediately preceding door operation, in accordance with a stabilized PWM signal in said high speed area in said immediately preceding door operation.
A controller for an automatic door system for controlling a motor which operates to open and close a door, comprising:
- a motor drive unit causing said motor to produce driving and braking forces;
- and
- a control unit for supplying a control signal to said motor drive unit;
- wherein said control unit includes:
- means for repeatedly computing a length of a braking area required for decreasing the speed of said door in a number of steps from a current speed of said door at the beginning of a cushioning area in which said door moves at a relatively low speed before said door stops moving, the amount of decrease of speed for each of the steps being fixed;
- and
- output means for making a judgment as to whether said door has reached a braking initiation position at which said braking is to be initiated each time the length of said braking area is computed, and outputting said control signal for initiating the deceleration of said door when said door is judged to have reached said braking initiation position, said braking initiation position being determined on the basis of the computed length of said braking area and a preset length of said cushioning area.
Dependencies are inferred from the claim text.