Modern automobile engines and associated emission controls are undergoing many design changes to improve fuel economy while meeting the required emission standards. For improved assessment of tradeoff options involving fuel economy, emissions, and performance, it is important to establish as a baseline the fuel-economy potential of modern engines when the constraint of emission controls is removed. This report describes the results of experimental work to determine the fuel-economy potential of three late-model automobiles and then to quantify the fuel-economy differential brought about by imposing emission controls to meet the current emission standards. The emission-control systems that were used included both oxidation catalysts with exhaust-gas-recirculation (EGR) and manifold air-injection systems with EGR. Results of tests with a 350 cubic-inch-displacement (CID) Chevrolet, a 318-CID Plymouth, and a 351-CID Ford indicate that an 11- to 40-pct improvement in fuel economy can be achieved if constraints upon engine parametric adjustment are removed. The precise value depends upon the type of emission-control system and/or driving cycle. The values suggest the lower boundary of potential improvement for these engines given an emission requirement and control system fully compatible with best fuel economy. Results on fuel economy, vehicle performance, and emissions from chassis dynamometer and road tests are discussed in the report.


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    Title :

    Investigation of the Fuel Economy Potential of Three Late-Model Automobiles


    Contributors:

    Publication date :

    1976


    Size :

    21 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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