US 9,810,742 B2
System and method for monitoring relay contacts
Federico Giordano, Valls (ES); and Antoni Ferre Fabregas, Valls (ES)
Assigned to Lear Corporation, Southfield, MI (US)
Filed by Lear Corporation, Southfield, MI (US)
Filed on Oct. 22, 2014, as Appl. No. 14/520,473.
Claims priority of provisional application 61/898,058, filed on Oct. 31, 2013.
Prior Publication US 2015/0137819 A1, May 21, 2015
Int. Cl. G01R 31/327 (2006.01); G01R 31/00 (2006.01); H01H 1/00 (2006.01); G01R 31/333 (2006.01)
CPC G01R 31/3278 (2013.01) [G01R 31/006 (2013.01); G01R 31/327 (2013.01); H01H 1/0015 (2013.01); G01R 31/333 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A system for monitoring at least one relay contact, the system comprising:
an emitter adapted for electrical communication with a first side of a first relay contact and for electrical communication with a first side of a second relay contact, the emitter configured to emit a monitoring signal;
a first receiver adapted for electrical communication with a second side of the first relay contact and configured to detect the monitoring signal emitted by the emitter;
a second receiver adapted for electrical communication with a second side of the second relay contact and configured to detect the monitoring signal emitted by the emitter; and
a controller adapted for electrical communication with the emitter and the first and second receivers, the controller configured to determine an open or a closed state of the first relay contact and to determine an open or a closed state of the second relay contact;
wherein the controller controls the emitter to emit the monitoring signal comprising a first component and a second component different than the first component, the controller determines a closed state of the first relay contact if the first receiver detects the first component, the controller determines an open state of the first relay contact if the first receiver fails to detect the first component, the controller determines a closed state of the second relay contact if the second receiver detects the second component, and the controller determines an open state of the second relay contact if the second receiver fails to detect the second component.