Door opener control with adaptive limits and method therefor

Details Door opener control with adaptive limits and method therefor Door opener control with adaptive limits and method therefor

1992-10-26

1994-01-11

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

Limit or end-stop control

318590, 318266, 318286, 318561, G05B 1114

Patent

active

052784800

ABSTRACT:
A garage door operator has a microcomputer based control which is programmed to measure door position from full open position by counting motor revolutions and to determine motor speed and deceleration for each revolution. The program learns the open and closed position limits as well as force sensitivity limits for up and down operation with minimal user input. During normal door operation the closed limit and the sensitivity limits are adaptively adjusted to accommodate changes in conditions. The lowest up and down motor speeds in each operation are stored for comparison with motor speeds in the next like operation for obstruction detection. Motor deceleration is also monitored for obstruction detection. For a more sensitive obstruction detection during closing, the motor speed is mapped for each revolution for the last several inches of closing. The map is stored after each successful closing operation and the corresponding speeds in the next closing are compared point-by point with the mapped speeds to detect slow down due to touching an obstruction.

REFERENCES:
patent: 4234833 (1980-11-01), Barrett
patent: 4259625 (1981-03-01), Hatakeyama et al.
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4638433 (1987-01-01), Schindler
patent: 4713591 (1987-12-01), McCloskey
patent: 4736144 (1988-05-01), Chun-Pu
patent: 4980618 (1990-12-01), Milnes et al.
patent: 4988992 (1991-01-01), Heitschel et al.
patent: 5069000 (1991-12-01), Zuckerman

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