Appeal 2007-1838
Application 10/118,523
external elements such as vehicle incline, temperature, motor strength, track
stiffness, and weather seal tightness (col. 3, ll. 19-25).
6. The control module also uses the door speed data at different
positions before closing to determine the duty cycle of the drive motor to
apply the proper closing force to the door (col. 3, ll. 39-47).
7. The duty cycle of the door is adjusted via pulse width modulated
(PWM) signals applied thereto when the door reaches the predetermined
positions (col. 3, ll. 47-49).
8. Cook further discloses that the pulsed input signals are also used
for obstruction detection, wherein an increase in the expected time interval
between input signals indicates that force is being applied to the door as well
as the force being applied by the door to an obstruction (col. 3, ll. 60-65).
9. Cook discloses that if the interval of a second plurality of pulses
exceeds that of first pulses, the control module determines that the force
exerted by the motor to the door exceeds a selected force threshold,
indicating that the door has encountered an obstruction (col. 3, l. 65 through
col. 4, l. 4).
10. Cook further discloses that during a door closing operation, if the
interval of the sample size exceeds a selected percentage, the system
determines that an obstacle has locked the door movement (col. 9, ll. 53-65).
Cook limits the maximum force imparted by drive motor to the door and by
the door to an obstruction (col. 9, l. 66 through col. 10, l. 3).
11. Cook provides for tracking the door position by allowing the
control module to learn where the value zero for fully closed door is or learn
from the pulse count the position of a fully open door (col. 6, ll. 15-33).
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Last modified: September 9, 2013