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Vibration Mitigation of Dynamic Skip Fire Engines with Flywheel Optimization and Torque Converter Clutch Slip
Technical Paper
2021-01-1105
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Dynamic Skip Fire (DSF) is an advanced cylinder deactivation technology to reduce fuel consumption and emissions of internal combustion engines. The firing sequence may vary dynamically depending on driver demanded torque with all cylinders capable of deactivation. This creates a challenge for managing noise vibration and harshness (NVH) caused by the low frequency excitation in the engine’s torque profile, especially in smaller engines with 3 or 4 cylinders. Due to the varying nature of firing sequences, the excitation is not limited to one or two engine orders and can vary with time, requiring broadband mitigation of the driveline. This work proposes the optimization of flywheel inertia combined with careful control of torque converter slip to overcome this challenge. Four different flywheel configurations and varying levels of torque converter slip were tested on a VW Jetta fitted with a 1.8L 4-cylinder engine with DSF control capability. For each configuration, DSF flyzone maps were generated and fuel consumption benefits were estimated. This paper covers a theoretical understanding of DSF excitations, vehicle NVH test results including torsional and seat vibration for various firing fractions with the different configurations, and fuel economy results with the optimized configuration. The methods developed here are extendable to other engines, platforms, and powertrain technologies like downsized, boosted engines with or without DSF/cylinder deactivation.
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Citation
Srinivasan, V. and Arvanitis, A., "Vibration Mitigation of Dynamic Skip Fire Engines with Flywheel Optimization and Torque Converter Clutch Slip," SAE Technical Paper 2021-01-1105, 2021, https://doi.org/10.4271/2021-01-1105.Data Sets - Support Documents
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References
- Wilcutts , M. , Switkes , J. , Shost , M. , and Tripathi , A. Design and Benefits of Dynamic Skip Fire Strategies for Cylinder Deactivated Engines SAE Int. J. Engines 6 1 2013 2013 278 288 10.4271/2013-01-0359
- Scassa , M. , George , S. , Nencioni , M. , Chen , S. et al. Dynamic Skip Fire Applied to a Diesel Engine for Improved Fuel Consumption and Emissions SAE Technical Paper 2019-01-0549 2019 2019 https://doi.org/10.4271/2019-01-0549
- Srinivasan , V. , Wolk , B. , Cai , X. , Henrichsen , L. et al. Application of Dynamic Skip Fire for NOx and CO2 Emissions Reduction of Diesel Powertrains SAE Technical Paper 2021-01-0450 2021 https://doi.org/10.4271/2021-01-0450
- Younkins , M. , Fuerst , J. , Carlson , S. , Kirwan , J. , et al. 2017 Presented at 38th International Vienna Motor Symposium 2017
- Younkins , M. , Ortiz-Soto , E. , Wilcutts , M. , Fuerst , J. , Rayl , A. 2018 Presented at 39th International Vienna Motor Symposium 2018
- Serrano , J. , Routledge , G. , Lo , N. , Shost , M. et al. Methods of Evaluating and Mitigating NVH When Operating an Engine in Dynamic Skip Fire SAE Int. J. Engines 7 3 2014 1489 1501 10.4271/2014-01-1675
- Inoue , T. , Takahashi , A. , Sano , H. , Onishi , M. et al. NV Countermeasure Technology for a Cylinder-On-Demand Engine-Development of Active Booming Noise Control System Applying Adaptive Notch Filter SAE Technical Paper 2004-01-0411 2004 https://doi.org/10.4271/2004-01-0411
- Lee , P. and Rahbar , A. Active Tuned Absorber for Displacement-On-Demand Vehicles SAE Technical Paper 2005-01-2545 2005 https://doi.org/10.4271/2005-01-2545
- Orzechowski , J. , Agnihotri , G. , and Juneja , V. Use of Active Vibration Control to Improve Vehicle Refinement while Expanding the Usable Range of Cylinder Deactivation SAE Technical Paper 2019-01-1571 2019 https://doi.org/10.4271/2019-01-1571
- Mitchiner , R.G. , and Leonard , R.G. 1991 Centrifugal Pendulum Vibration Absorbers—Theory and Practice ASME. J. Vib. Acoust. 113 4 503 507 https://doi.org/10.1115/1.2930214
- Schneider , F. , Saxena , V. , Moser , A. Presented at 15th International CTI Symposium Automotive Transmissions, HEV and EV Drives 2016
- Ortiz-Soto , E. , Yang , X. , Van Ess , J. , Owlia , S. et al. Controls and Hardware Development of Multi-Level Miller Cycle Dynamic Skip Fire (mDSF) Technology SAE Technical Paper 2021-01-0446 2021 https://doi.org/10.4271/2021-01-0446