Position encoder for sliding door power drive system

Details Position encoder for sliding door power drive system Position encoder for sliding door power drive system

1990-09-24

1991-08-13

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

318466, 49139, G05B 501

Patent

active

050399250

ABSTRACT:
A position encoder for a sliding door power drive system, such as those employed on van type vehicles, enables a positive drive powered operation of the door by a control switch remote from the door while accommodating manual operation of the door without mechanical interference or resistance from the drive or altering of the drive control program. A push/pull cable connected to the door is in positive meshed engagement at all times with a rotary drive gear whose rotative displacement from a rest position is continuously read by the position encoder and transmitted to a control unit as a door position input signal. During powered operation of the door, the control unit controls a bidirectional drive motor which is coupled to the drive gear via a normally disengaged clutch to drive the door to selected positions along its path of movement. The position encoder is formed of first and second photoelectric units mounted in spaced relationship with a rotative encoder wheel having spaced teeth separated by apertures. The first and second photoelectric units are spaced apart to independently detect the passage of different teeth as the encoder wheel rotates through its fixed engagement with the rotary drive gear. These signals are input to the control unit which calculates the actual position of the door, the direction of movement of the door and the rate of input of the signals to determine when the door reaches an end limit of movement as whether the door has struck an obstruction.

REFERENCES:
patent: 4471230 (1984-09-01), Yamamoto
patent: 4529920 (1985-07-01), Yoshida et al.
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4769584 (1988-09-01), Irigoyen
patent: 4922168 (1990-05-01), Waggamon et al.
patent: 4965502 (1990-10-01), Ogasawara

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