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Technology Stocks : Orbital Engine (OE)

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To: Krowbar who started this subject	11/7/2003 1:47:19 AM
From: Daddy	Read Replies (1) of 4908

How do they get past Orbital's patents?....creating injectors of their own. swri.edu Spark Ignition Engines Project Brief Efficiency Improvements Associated with Ethanol-Fueled Spark-Ignition Engines Reference: 03-1438 Client: U.S. Department of Energy National Renewable Energy Laboratory Duration: Sixteen Months Objective: Evaluate how ethanol may be used for improved efficiency of spark-ignition engines while maintaining very low emissions and to demonstrate some of those improvements on the DOE/NREL/SwRI Ultra-Low Emissions Vehicle (ULEV), a modified 1993 Ford Taurus with a 3.0-liter V-6 engine. Approach: Computer simulations were used to estimate brake thermal efficiencies and fuel efficiencies of various engine concepts. Because of the very high octane number of ethanol (>100), high compression ratios are possible, increasing thermal efficiency significantly. A number of modifications were made to the engine and vehicle to first reduce emissions to ULEV levels and to improve the efficiency. These changes include the following: The OEM engine/vehicle control system was replaced with an SwRI® Rapid Prototyping Electronic Control System (RPECS) to allow complete flexibility in changing engine and aftertreatment hardware and control strategies. The compression ratio was increased from 9.3:1 to 12.0:1 to take advantage of the high octane number of Ed85 (85% denatured ethanol/15% gasoline), increasing efficiency about 8% compared with the baseline engine. * Close-coupled catalysts were added in addition to the OEM main catalysts. * A new catalyst light-off system, fast-light off port combustion, was added to the vehicle. * Air-assist injectors designed at SwRI were used to provide fine spray atomization for improved cold-start and better emissions.

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