Advanced diesel engine architectures employing flexible valve trains enable emissions reductions and fuel economy improvements. Flexibility in the valve train allows engine designers to optimize the gas exchange process in a manner similar to how common rail fuel injection systems enable optimization of the fuel injection process. Modulating valve timings directly impacts the volumetric efficiency of the engine. In fact, the control authority of valve timing modulation over volumetric efficiency is three times larger than that due to any other engine actuator. Traditional empirical or regression-based models for volumetric efficiency, while suitable for conventional valve trains, are therefore challenged by flexible valve trains. The added complexity and additional empirical data needed for wide valve timing ranges limit the usefulness of these methods. A physically-based volumetric efficiency model was developed to address these challenges. The model captures the major physical processes occurring over the intake stroke, and is applicable to both conventional and flexible valve trains. The model inputs include temperature and pressure in the intake and exhaust manifolds, intake and exhaust valve timings, bore, stoke, connecting rod length, engine speed and effective compression ratio, ECR. The model is physically-based, requires no regression tuning parameters, is generalizable to other engine platforms, and has been experimentally validated using an advanced multi-cylinder diesel engine equipped with a flexible variable intake valve actuation system. Experimental data was collected over a wide range of the operating space of the engine and augmented with air handling actuator and intake valve timing sweeps to maximize the range of conditions used to thoroughly experimentally validate the model for a total of 217 total operating conditions. The physical model developed differs from previous physical modeling work through the novel application of ECR, incorporation of no tuning parameters and extensive validation on unique engine test bed with flexible intake valve actuation.
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ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control
October 31–November 2, 2011
Arlington, Virginia, USA
Conference Sponsors:
- Dynamic Systems and Control Division
ISBN:
978-0-7918-5475-4
PROCEEDINGS PAPER
Physically-Based Volumetric Efficiency Model for Diesel Engines Utilizing Variable Intake Valve Actuation Available to Purchase
Lyle Kocher,
Lyle Kocher
Purdue University, West Lafayette, IN
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Ed Koeberlein,
Ed Koeberlein
Purdue University, West Lafayette, IN
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D. G. Van Alstine,
D. G. Van Alstine
Purdue University, West Lafayette, IN
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Karla Stricker,
Karla Stricker
Purdue University, West Lafayette, IN
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Greg Shaver
Greg Shaver
Purdue University, West Lafayette, IN
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Lyle Kocher
Purdue University, West Lafayette, IN
Ed Koeberlein
Purdue University, West Lafayette, IN
D. G. Van Alstine
Purdue University, West Lafayette, IN
Karla Stricker
Purdue University, West Lafayette, IN
Greg Shaver
Purdue University, West Lafayette, IN
Paper No:
DSCC2011-5997, pp. 913-920; 8 pages
Published Online:
May 5, 2012
Citation
Kocher, L, Koeberlein, E, Van Alstine, DG, Stricker, K, & Shaver, G. "Physically-Based Volumetric Efficiency Model for Diesel Engines Utilizing Variable Intake Valve Actuation." Proceedings of the ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control. ASME 2011 Dynamic Systems and Control Conference and Bath/ASME Symposium on Fluid Power and Motion Control, Volume 1. Arlington, Virginia, USA. October 31–November 2, 2011. pp. 913-920. ASME. https://doi.org/10.1115/DSCC2011-5997
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