Evaluation of Advanced Petroleum-Based Fuels
Interim rept. Oct 2000-May 2001
SOUTHWEST RESEARCH INST SAN ANTONIO TX TARDEC FUELS AND LUBRICANTS RESEARCH FACILITY
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The U.S. Department of Energy with the cooperation of DaimlerChrysler undertook a series of evaluations of diesel fuel formulation alternatives using the newly released Daimler-Benz OM 611 diesel engine as a surrogate for an advanced diesel engine as identified by Partnership for the Next Generation of Vehicles PNGV program. The first phase completed in 1998 SAE 2000-01-2048 evaluated exhaust emissions and fuel economy benefits of several alternative diesel fuels without adjusting the engine control system. That work found that large reductions in engine out particulate emissions were possible with some fuels. In particular compared to the 49 state on-highway diesel fuel used as a reference a diesel fuel from the Fischer-Tropsch process and a fuel consisting of a blend of dimethoxymethane and a Swedish Class 1 City Fuel-like petroleum fraction each reduced particulates on the order of fifty percent without increasing oxides of nitrogen emissions. This phase II work evaluated a subset of the seven fuels tested in Phase I as well as fuels recommended by the AutoEnergy Ad Hoc Fuels Research Group with limited optimization of the DaimlerChrysler CM 611 engine for each fuel. Because the fuels under consideration have differing physical and chemical properties a portion of any change in exhaust emissions measured in Phase I may be due to the response of the engines fuel injection system to differences in the fuels physical properties. The approach for Phase II was to recalibrate several of the engine operating parameters that influence engine emissions and fuel economy for each fuel. The operating parameters considered in this optimization process included boost level exhaust gas recirculation EGR fuel injection timing and pressure in the common rail injection system. Engine-out emissions no after-treatment and performance were determined at a series of steady state test modes.
- Reciprocating and Rotating Engines