Analysis memorandum: design factor update. Task 24, Subtask 1
The design factor update study was conducted in two phases. Phase one established the data base and generated sensitivity coefficients at a highly disaggregated level - for each combination of manufacturer, model year, engine family, transmission type, and technology group. The coefficient distributions were analyzed for dependence on parameter values and on EPA test results (e.g., the ETW coefficient for EPA city mpg's as linear functions of ETW and/or EPA city mpg). Preliminary design factors also were generated at a series of aggregated levels. These interim results provided design factor coefficients at frequently encountered aggregations and led to revised specifications for the second phase. Phase two of the study focused on developing statistical models for ETW, PAU, and N/V factors that accounted for the variation of design factor sensitivities with parameter values. This portion of the study also examined whether PAU or N/V factors were dependent on ETW, since there exist correlations between changes in vehicle weight and variation in the other design parameters. The study concluded with a provisional statistical model.
- Research Organization:
- Energy and Environmental Analysis, Inc., Arlington, VA (USA)
- DOE Contract Number:
- AC01-78PE70045
- OSTI ID:
- 5657825
- Report Number(s):
- DOE/PE/70045-T11; ON: DE84003934
- Resource Relation:
- Other Information: Microfiche only, copy does not permit paper copy reproduction
- Country of Publication:
- United States
- Language:
- English
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