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Cummins ISB LTMS2

Cummins ISB LTMS2. This package contains charts and figures that supplement the LTMS2 template put forth by Statistics Task Group. LTMS2 Template document name: “Cummins ISB LTMS Version 2 Proposal.docx”

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Cummins ISB LTMS2

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  1. Cummins ISB LTMS2 This package contains charts and figures that supplement the LTMS2 template put forth by Statistics Task Group. LTMS2 Template document name: “Cummins ISB LTMS Version 2 Proposal.docx” The LTMS2 template contains possible values for the various chart limits. Page 2 of this document summarizes these values. Pages 3-11 show the control charts and alarms of LTMS1 and proposed LTMS2. Pages 12-14 contain some comments on Excessive Influence calculations and alarms in LTMS1&2. Art Andrews November 30, 2010

  2. LTMS1 focus: Shewhart severity (Y) alarms

  3. ACSW

  4. ATWL

  5. LTMS2 focus: e alarms

  6. ACSW

  7. ATWL

  8. Comparisons LTMS1 / LTMS2 focus: number of reference interval extensions and reductions

  9. Reference Interval Extensions and Reductions 37 total reference oil results 12 were calibration tests 37-12=25 tests were eligible for extended intervals 9/25 (36%) received extended intervals in LTMS2 7/37 (18.9%) failed in LTMS2

  10. RMSE overall for all labs RMSE by lab

  11. Appendix Comments on Excessive Influence and Alarms

  12. Tappet weight loss severity charts showing Excessive Influence calculation Excessive Influence calculation adjusted Y results from green filled circle to cyan circle.

  13. Tappet weight loss precision charts showing e These are examples of results that trigger alarms in LTMS2 but not LTMS1. While their Y results are not excessive, their e values are high (~1.1) because they outlie the lab’s Z baseline (~-0.9). This is an example of a result that would trigger alarm in either LTMS1 and LTMS2. It has a high Y value that exceeds LTMS1 limit. It has a high e value because its result (~2.8) outlies the lab’s Z baseline (~0.1). The dotted line is Level 2 e alarm, and solid line Level 3 e alarm

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