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Durability and Reliability Demonstration for Switching Roller Finger Follower in Cylinder Deactivation Systems
Technical Paper
2015-01-2816
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Cylinder deactivation (CDA) is an effective method to adjust the engine displacement for maximum output and improve fuel economy by adjusting the number of active cylinders in combustion engines. A Switching Roller Finger Follower (SRFF) is an economic solution for CDA that minimizes changes and preserves the overall width, height, or length of Dual Overhead Cam (DOHC) engines. The CDA SRFF provides the flexibility of either transferring or suppressing the camshaft movement to the valves influencing the engine performance and fuel economy by reducing the pumping losses. This paper addresses the performance and durability of the CDA SRFF system to meet the reliability for gasoline passenger car engines. Extensive tests were conducted to demonstrate the dynamic stability at high engine speeds and the system capacity of switching between high and low engine displacement within one camshaft revolution. The system durability was demonstrated with high and low engine speeds, various oil temperatures, mode switching, and abuse tests, meeting the end of life criteria in wear and function. System robustness to dimensional variation was tested to understand the effect on performance and durability. Lash increase, one important metric for wear evaluation, was monitored during durability and abuse tests. Multiple life tests were performed to demonstrate the system reliability of 99.94% over the engine's useful life. Test results show a robust design for performance, durability, and reliability for passenger car applications.
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Radulescu, A., Roberts, L., and Yankovic, E., "Durability and Reliability Demonstration for Switching Roller Finger Follower in Cylinder Deactivation Systems," SAE Technical Paper 2015-01-2816, 2015, https://doi.org/10.4271/2015-01-2816.Also In
References
- Office of Transportation and Air Quality EPA” and NHTSA “Propose to Extend the National Program to Reduce Greenhouse Gases and Improve Fuel Economy for Cars and Trucks EPA-420-F-11-038 Nov. 2011
- National Highway Traffic Safety Administration 2017-2025 Model Year Light-Duty Vehicles GHG Emissions and CAFÉ Standards: Supplemental July 29 2011
- U.S. Department of Energy Report Update for Advanced Technologies to Improve Fuel Economy of Light Duty Vehicles Aug. 2007
- Roberts , C. Variable Valve Timing SwRI Project No. 03.03271, Clean Diesel III Program March 2004
- Roberts , L. , Magee , M. , Fain , D. , Shaver , G. , Holloway , E. , McCarthy , J. , Jr. , Nielsen , D. , Koeberlein , E. , Shute , R. , Koeberlein , D. Impact of Cylinder Deactivation at Idle on Thermal Management and Efficiency SAE CV-0336, SAE Commercial Vehicle Congress Oct. 2014
- Roberts , L. , Magee , M. , Shaver , G. , Garg , A. , McCarthy , J. , Jr. , Koeberlein , E. , Holloway , E. , Shute , R. , Koeberlein , D. and Nielsen , D. Modeling the Impact of Early Exhaust Valve Opening on Exhaust After treatment Thermal Management and Efficiency for Compression Ignition Engines International Journal of Engine Research 10.1177/1468087414551616 Oct. 2014
- Stabinsky , M. , Albertson , W. , Tuttle , J. , Kehr , D. et al. Active Fuel Management™ Technology: Hardware Development on a 2007 GM 3.9L V-6 OHV SI Engine SAE Technical Paper 2007-01-1292 2007 10.4271/2007-01-1292
- Fujiwara , M. , Kumagai , K. , Segawa , M. , Sato , R. et al. Development of a 6-Cylinder Gasoline Engine with New Variable Cylinder Management Technology SAE Technical Paper 2008-01-0610 2008 10.4271/2008-01-0610
- Leone , T. and Pozar , M. Fuel Economy Benefit of Cylinder Deactivation - Sensitivity to Vehicle Application and Operating Constraints SAE Technical Paper 2001-01-3591 2001 10.4271/2001-01-3591
- Douglas , K. , Milovanovic , N. , Turner , J. , and Blundell , D. Fuel Economy Improvement Using Combined CAI and Cylinder Deactivation (CDA) - An Initial Study SAE Technical Paper 2005-01-0110 2005 10.4271/2005-01-0110
- Fiorenza , R. , Pirelli , M. , Torella , E. , Pallotti , P. et al. VVT +Port Deactivation Application on a Small Displacement SI 4 Cylinder 16V Engine: An Effective Way to Reduce Vehicle Fuel Consumption SAE Technical Paper 2003-01-0020 2003 10.4271/2003-01-0020
- Radulescu , A. , McCarthy , JR J. , and Brownell , S. Development of a Switching Roller Finger Follower for Cylinder Deactivation in Gasoline Engine Applications SAE Technical Paper 2013-01-0589 2013 10.4271/2013-01-0589
- Zurface , A. , Brownell , S. , Genise , D. , Tow , P. et al. Design and Development of a Switching Roller Finger Follower for Discrete Variable Valve Lift in Gasoline Engine Applications SAE Int. J. Fuels Lubr. 5 3 1066 1077 2012 10.4271/2012-01-1639
- U.S.E.P.A (United States Environmental Protection Agency) Tier 3 Motor Vehicle Emission and Fuel Standard EPA-420-F-14-009 March 2014
- Trudell , D. , McCarthy , Jr. , J. , and Tow , P. Switching Roller Finger Follower Meets Lifetime Passenger Car Durability Requirements SAE Technical Paper 2012-01-1640 2012 10.4271/2012-01-1640
- Radulescu , A. , Krishnasamy , V. , and Chandras , P. Switching Response Optimization for Cylinder Deactivation with Type II Passenger Car Applications SAE Technical Paper 2014-01-1704 2014 10.4271/2014-01-1704