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. 17, 1998
Filed:
May. 22, 1996
Laurent Pierre Llerena, Saint Avertin, FR;
Faiveley Transport, Saint Denis, FR;
Abstract
A method of electronically controlling the opening and/or closing of a door by a DC motor. An instantaneous position of the door is determined. The voltage across the terminals of the DC motor or the current flowing through the windings of the motor is regulated as a function of the determined instantaneous position. The above two operating steps are repeated at a predetermined time intervals for controlling the displacement of the door. To determine the instantaneous position of the door, the instantaneous voltage across the terminals of the motor is measured, and the instantaneous current flowing through the windings of the motor is measured. The displacement of the door during the present time interval is computed as a function of the measured instantaneous voltage and current values and as a function of known and constant values for the back-emf and for the internal resistance of the motor. The computed displacement is added to the value of the instantaneous position as determined during the preceding time interval to obtain the determined instantaneous position of the door at the end of the present time interval.