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Trapping prevention guard and method for controlling a motor-driven adjusting device

  • US 7,786,689 B2
  • Filed: 02/15/2007
  • Issued: 08/31/2010
  • Est. Priority Date: 02/17/2006
  • Status: Active Grant
First Claim
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1. A trapping prevention guard for an adjusting device, the trapping prevention guard comprisinga motorized drive anda control unit that is configured to derive an initial total load exerted by the motorized drive from at least one detected characteristic variable of the motorized drive in order to monitor for a trapping instance,wherein the control unit is configured to derive the initial total load during a start phase at the beginning of an actuation operation of the adjusting device and to store the initial total load as the nominal load of the adjusting devicewherein the control unit is configured to determine whether trapping has occurred during a monitoring phase from a comparison between the nominal load and a total load which varies during the actuation operation of the adjusting device andwherein the control unit employs a first mathematical model in order to determine the total load, and changes over to a second mathematical model that takes into account the trapping instance only if there is a significant deviation between the total load and the nominal load or if there is a significant deviation in the detected characteristic variable for assessing whether trapping has occurred.

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