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Downsized Boosted Engine Benchmarking Method and Results (SAE Paper 2015-01-1266)
Citation:
STUHLDREHER, M., A. MOSKALIK, C. SCHENK, J. BRAKORA, D. HAWKINS, AND P. DEKRAKER. Downsized Boosted Engine Benchmarking Method and Results (SAE Paper 2015-01-1266). In Proceedings, 2015 SAE World Congress, Detroit, MI, April 21 - 23, 2015. SAE International, Warrendale, PA, SAE #2015-01-1266, (2015).
Impact/Purpose:
The benchmarking study described in this paper included vehicle chassis testing and engine dyno testing in order to measure the engine and vehicle efficiencies. This paper describes EPA’s “tethered” engine dyno benchmarking method which used a 1.6L Ecoboost engine mounted in a dyno test cell with a lengthened engine wire harness tethered to a complete 2013 Ford Escape vehicle outside the test cell. This method allowed engine mapping with the stock ECU and calibrations. Data collected included torque, fuel flow, emissions, temperatures, pressures, in-cylinder pressure, and OBD/epid can data. Engine and vehicle data were then used as inputs to EPA’s Advanced Light-duty Powertrain and Hybrid Analysis (ALPHA) full vehicle simulation model as part of a model validation exercise.
Description:
Light-duty vehicle greenhouse gas (GHG) and fuel economy (FE) standards for MYs 2012 -2025 are requiring vehicle powertrain to become much more efficient. One key technology strategy that vehicle manufacturers are using to help comply with GHG and FE standards is to replace naturally aspirated engines with smaller displacement “downsized” boosted engines. In order to understand and measure the effects of this technology, the EPA benchmarked a 2013 Ford Escape Ecoboost 1.6L, which at the time it was introduced represented the state of the art in boosted downsized engine technology.