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CRC Customer Versus Rater Octane Number Requirement Program
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English
Abstract
A Coordinating Research Council, Inc. (CRC) cooperative program was conducted to determine the difference in octane requirements between technical raters and “customers.” The trained raters used the CRC E-15 procedure to determine the octane requirement of the vehicles while the customers' perception and objection to knock were determined through the use of a questionnaire. The results showed that the customers' objections and perceptions were overwhelmingly based on knock, rather than acceleration performance or after-run. The difference between the technical and customer octane requirement at the midpoint satisfaction level was 3.8 (R+M)/2 octane numbers using the population comparison and 4.1 (R+M)/2 octane numbers using the distribution of delta analysis. The statistical analysis of the database also showed that the differences between customer objection and perception levels were generally small (less than or equal to 1 (R+M)/2 octane number). Knock sensors were found to have significant effect on the difference between the technical and customer ratings; this effect may be due to a decrease in customer awareness when knock sensors were present. This study and the previous studies found the customer/rater deltas increase as the technical ratings increase.
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Citation
Uihlein, J., Biller, W., Bonés, C., Bouffard, R. et al., "CRC Customer Versus Rater Octane Number Requirement Program," SAE Technical Paper 932673, 1993, https://doi.org/10.4271/932673.Also In
References
- Coordinating Research Council, Inc. “1975 CRC Customer/Rater Knock Perception Study,” CRC Report No. 492 September 1977
- Coordinating Research Council, Inc. “1978 CRC Customer Versus Rater Octane Number Requirement Survey,” CRC Report No. 514 April 1980
- Coordinating Research Council, Inc. “1990 CRC Octane Number Requirement Survey,” CRC Report No. 575 July 1991
- Coordinating Research Council, Inc. “1990 CRC Customer Versus Rater Octane Number Requirement Program,” CRC Report No. 586 September 1993
- Coordinating Research Council, Inc. “1989 CRC Octane Number Requirement Survey,” CRC Report No. 570 August 1990