G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 17/40 (2006.01) G11B 20/10 (2006.01) A61B 5/0432 (2006.01)
Patent
CA 2161383
An event history data recorder and method for recording data relating to a distinct event and pertaining to operation of a mechanism preceding and following each occurrence of such distinct event. The recorder comprises a means for collecting data pertaining to such operation and for formatting such collected data into a sequence of data elements. The recorder includes a circular buffer linked to the collecting and formatting means for temporarily storing a preset number of the data elements. The data elements are continuously stored on the circular buffer as a newest data element continuously writes over an oldest data element as a storage limit of the circular buffer is reached. The recorder also includes a timer of predetermined duration which activates upon each occurrence of such distinct event. The recorder additionally includes a memory device for retaining the data elements. The data elements can be accessed therefrom for analysis of such operation of such mechanism surrounding such distinct event. The recorder further includes a means, connected to the timer, for transferring the data elements from the circular buffer to the memory device wherein for each occurrence of such distinct event a preselected number of the data elements stored prior to, and including, an instant the timer deactivates is transferred by the transferring means from the circular buffer to the memory device. A data log is thereby formed within the memory device from which the data elements may be accessed for analysis of such operation of such mechanism.
Greer David A.
Schweikert David E.
Macrae & Co.
Westinghouse Air Brake Company
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