The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 27, 2018
Filed:
Mar. 17, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Doru N. Serban, Richmond Hill, CA;
Brian Norman Orr, Chesterfield, MI (US);
Norman J. Weigert, Whitby, CA;
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A system and method detects an obstruction in the path of a vehicle access control member moving from an open position to a closed position. The method includes transmitting a detection signal along an edge of the member towards a reflective surface mounted on the member. The detection signal includes a sequence of pulses having different amplitudes with the amplitudes varying linearly moving from a first pulse to a final pulse of the sequence of pulses. The method further includes receiving a detection response signal corresponding to the detection signal following reflection of the detection signal by one of the reflective surface and the obstruction. The detection response signal includes another sequence of pulses and the method further includes generating an obstruction signal indicating whether the obstruction is in the path of the access control member responsive to differences in amplitude between adjacent pulses in the sequence of pulses.