B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
B61L 27/04 (2006.01) B60L 15/20 (2006.01) B61L 3/00 (2006.01)
Patent
CA 2001080
The functions to be performed by a digital overspeed controller are implemented by application of two concepts, namely "diverse channels" and "even/odd systems cycles"; in accordance with the ~irst concept; two channels are maintained throughout the overspeed controller, beginning with two independent tachometer inputs; all of the functions involve operations to be performed in each of the two channels separately. The numerical results for each of the channels are different and the numerical difference between the two channels is used to prove the integrity of the functions described. The second concept of "even/odd system cycles" involves a "system cycle time", denoted T CYC, that is nominally 100 milliseconds. All of the functions of the controller are performed each system cycles. In order to be able to vitally distinguish data results between adjacent cycleq, the cycles are denoted EVEN and ODD, and the results of each of the operations produce different numerical values on even and odd cycles.
Borden Ladner Gervais Llp
General Signal Corporation
Sasib S.p.a.
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