Final Technical Study on Reduction of Automotive Accessory Power Requirements. Final Report, June 1974-June 1978

摘要

The objective of this program was to define, evaluate, and develop automotive accessory systems to minimize engine power consumption and significantly improve fuel economy. Standard accessory equipment includes air conditioning, power steering alternator, engine cooling fan, water pump, and emissions air pump. The program studies included conceptual, preliminary, and detail design of accessory systems for internal combustion engine vehicles plus component fabrication and performance testing. Accessory drives, such as variable speed and hydrid drives, for standard and advanced air conditioning systems were evaluated. Finally, accessories for advanced vehicular engines, e.g., gas turbines and Stirling engines, were investigated. As a result of the Accessory System Optimization Program, it was concluded that the effect of accessory loads on the overall fuel economy of present day internal combustion engine automobiles can be decreased by as much as 50% by applying technology well within present manufacturing capability. Further improvements in fuel economy could also be achieved through development of hybrid drive concepts if the market would bear the attendant cost increases. The automotive Stirling and gas turbine advanced engine study produced specific accessory design concepts to limit power requirements and maximize overall fuel economy. Integrated, variable speed, accessory systems for the Stirling application and waste heat conservation for the gas turbine were recommended for development. A dual air conditioning/waste heat regeneration concept was proposed for gas turbine application and a helical screw compressor-expander was designed. The advanced engine accessory study strongly recommends concurrent development of engine and accessories. (ERA citation 06:032216)