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Multi-Cylinder Opposed-Piston Engine Results on Transient Test Cycle
Technical Paper
2016-01-1019
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
After having tested basic transient maneuvers such as load-step changes on the 4.9L three-cylinder opposed-piston diesel engine [1], a similar test-engine was subjected to a more aggressive test-routine - a hot-start heavy-duty FTP (Federal Test Procedure) transient cycle for the on-road engines. The three main objectives of this exercise were:
- 1To assess the ability of the engine to meet the transient cycle requirements while maintaining close to the cycle-average BSFC for the FTP cycle derived from steady-state torque-to-fuel map.
- 2To attain engine-out brake-specific emission levels that are compatible with US2010 EPA requirements with a conventional after-treatment system consisting of a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF) and a selective catalyst reduction (SCR) system.
- 3To compare hot-start FTP transient cycle fuel economy with a publicly available benchmark.
The initial results from the test are encouraging - the BSFC value is within 1.2% of the value derived from running FTP cycle on a steady-state torque-to-fuel map. The engine-out emissions (BSNOx and BSSoot) levels generated during the test are compatible with US2010 EPA tail-pipe emissions requirements and can be controlled with contemporary after-treatment systems. Furthermore, compared to the MY2011 Cummins ISB 6.7L engine, Achates Power’s OP engine presents a cycle-average BSFC advantage of 18% during hot-start FTP cycle. These results highlight the capabilities of the Achates Power OP engine to successfully run aggressive transient maneuvers without compromising the required performance attributes.
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Citation
Sharma, A. and Redon, F., "Multi-Cylinder Opposed-Piston Engine Results on Transient Test Cycle," SAE Technical Paper 2016-01-1019, 2016, https://doi.org/10.4271/2016-01-1019.Also In
References
- Redon , F. , Sharma , A. , and Headley , J. Multi-Cylinder Opposed Piston Transient and Exhaust Temperature Management Test Results SAE Technical Paper 2015-01-1251 2015 10.4271/2015-01-1251
- Naik , S. , Redon , F. , Regner , G. , and Koszewnik , J. Opposed-Piston 2-Stroke Multi-Cylinder Engine Dynamometer Demonstration SAE Technical Paper 2015-26-0038 2015 10.4271/2015-26-0038
- Thiruvengadam , A. , Pradhan , S. , Thiruvengadam , P. , Besch , M. , Carder , D. , Delgado , O. Heavy-Duty Vehicle Diesel Engine Efficiency and Energy Audit http://www.theicct.org/heavy-duty-vehicle-diesel-engine-efficiency-evaluation-and-energy-audit 10 12 2014
- EPA, 40 CFR 1065 Engine Testing Procedures https://www.gpo.gov/fdsys/granule/CFR-2011-title40-vol33/CFR-2011-title40-vol33-part1065
- Majewski W.Addy Diesel Particulate Filters Dieselnet https://www.dieselnet.com/tech/dpf.php