Cost, Effectiveness, and Deployment of Fuel Economy Technologies for Light-Duty Vehicles (2015) / Chapter Skim
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Appendix J: Reasons for Potential Differences from NHTSA Estimates for Fuel Consumption Reduction Effectiveness of Turbocharged, Downsized Engines
Appendix J: Reasons for Potential Differences from NHTSA Estimates for Fuel Consumption Reduction Effectiveness of Turbocharged, Downsized Engines
Pages 390-392
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From page 390... ...
turbocharged engines operating C in the CAFE drive cycles was estimated to be 1.5:1. on 91 RON gasoline compared to European engines The increase in pressure of 50 kPa (above 100 kPa atmospheric pressure)
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From page 391... ...
With the assumed 91 RON gasoline at these con- c. Conclusion: Spark retard to avoid knock at some condi ditions, spark must be retarded, according to the tions on the CAFE drive cycles will result in approxi RON/spark retard criteria shown above: mately 6 percent increase in fuel consumption at those conditions and an estimated 0.25 percent increase in Spark Retard = 15 degrees from MBT (minimum fuel consumption on the CAFE drive cycles.
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From page 392... ...
2009. Develop ment of a Turbocharged Direct Injection Downsizing Demonstrator increase in fuel consumption on the CAFE drive cycles.
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