Half/Full Toroidal, Single/Double Roller, CVT Based Transmission for a Super-Turbo-Charger
Turbocharging dramatically improves the power density of internal combustion engines. However, when the energy to turbine is either smaller or larger than what is needed by the compressor for a specific steady state or transient point, there are downfalls, such as turbo-lag, lack of boost, or wasted exhaust energy. Here we propose a super-turbo-charger, where the turbo-charger shaft is connected to the crankshaft through a continuously variable transmission (CVT) and gears’ pairs. Different designs are considered, half-toroidal and full-toroidal, single-roller or double-roller, single-CVT or two-CVT-in-series. Energy is drawn from the crankshaft or delivered to the crank-shaft to improve the steady or transient operation. In this paper, a six-cylinder, dual fuel diesel injection ignition engine is super-turbocharged. Engine performance simulations show the opportunity to achieve a nearly flat maximum torque all over the range of engine speeds and very high efficiencies from one fourth of the load up-wards.
A. Boretti, “Super turbocharging the direct injection diesel engine,” Nonlinear Engineering, vol. 7, pp. 17-27, 2018.
A. Boretti and A. Ordys, “Super-turbocharging the dual fuel diesel injection ignition engine,” SAE Technical Paper, July, 2018.
A. Boretti and S. Castelletto, “Super-turbocharged direct injection jet ignition gasoline engine,” paper accepted for presentation to the FISITA World Congress 2018, Chennai, India, October 2018.
Shell, “Pearl GTL - Overview,” https://www.shell.com/about-us/major-projects/pearl-gtl/pearl-gtl-an-overview.html, October 2018.
Westport, “Westport HPDI 2.0,” https://www.westport.com/is/core-technologies/hpdi-2, October 2018.
A. Boretti, “Advantages of the direct injection of both diesel and hydrogen in dual fuel H2ICE,” International Journal of Hydrogen Energy, vol. 36, pp. 9312-9317, 2011.
A. Boretti, “Novel heavy duty engine concept for operation dual fuel H2-NH3,” International Journal of Hydrogen Energy, vol. 37, pp. 7869-7876, 2011.
A. Boretti, “Numerical study of the substitutional diesel fuel energy in a dual fuel diesel-LPG engine with two direct injectors per cylinder,” Fuel Processing Technology, vol. 161, pp. 41-51, 2017.
A. Boretti, “Advances in combustion systems for gas engines,” SAE Technical Paper, September 2013.
M. Magda, “Inside look: variable-speed supercharging technology,” https://www.enginelabs.com/news/inside-look-variable-speed-supercharging-technology/, January 2016.
B. Hu, S. Akehurst, A. G. Lewis, P. Lu, D. Millwood, C. Copel, E. Chappell, A. D. Freitas, J. Shawe, and D. Burtt, “Experimental analysis of the V-Charge variable drive supercharger system on a 1.0 L GTDI engine.” Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, vol. 232, pp. 449-465, 2018.
H. Kamel, “Toroidal CVT transmission,” https://grabcad.com/library/torodial-cvt-transmission, December 2012.
C. Brockbank, “Application of a variable drive to supercharger and turbo compounder applications,” SAE Technical Paper, April, 2009.
D. Cross and C. Brockbank, “Mechanical hybrid system comprising a flywheel and CVT for motorsport and mainstream automotive applications,” SAE Technical Paper, April, 2009.
F. Verbelen, S. Derammelaere, P. Sergeant, and K. Stockman, “A comparison of the full and half-toroidal continuously variable transmissions in terms of dynamics of ratio variation and efficiency,” Mechanism and Machine Theory, vol. 121, pp. 299-316, 2018.
Y. Zhang, X. Zhang, and W. Tobler, “A systematic model for the analysis of contact, side slip, and traction of toroidal drives,” Journal of Mechanical Design, vol. 122, pp. 523-528, 2000.
Z. Zou, Y. Zhang, X. Zhang, and W. Tobler, “Modeling and simulation of traction drive dynamics and control,” Journal of Mechanical Design, vol. 123, pp. 556-561, 2001.
G. Carbone, L. Mangialardi, and G. Mantriota, “A comparison of the performances of full and half-toroidal traction drives,” Mechanism and Machine Theory, vol. 39, pp. 921-942, 2004.
M. Delkhosh, M. S. Foumani, M. Boroushaki, M. Ekhtiari, and M. Dehghani, “Geometrical optimization of half-toroidal continuously variable transmission using particle swarm optimization,” Scientia Iranica, vol. 18, pp.1126-1132, 2011.
F. Verbelen, S. Derammelaere, P. Sergeant, and K. Stockman, “Visualizing the efficiency of a continuously variable transmission,” In Energy Efficiency in Motor Driven Systems EEMODS, in press.
F. Verbelen, S. Derammelaere, P. Sergeant, and K. Stockman, “Half-toroidal continuously variable trans-mission: trade-off between dynamics of ratio variation and efficiency,” Mech. Mach. Theory, vol. 107, pp. 183-196, 2017.
G. Carbone, F. Bottiglione, L. D. Novellis, L. Mangialardi, and G. Mantriota, “The double-roller full-toroidal variator: a promising solution for KERS technology,” In Proceedings of the FISITA 2012 World Automotive Congress, 2013, pp. 241-250.
L. D. Novellis, G. Carbone, and L. Mangialardi, “Traction and efficiency performance of the double-roller full-toroidal variator: a comparison with half-and full-toroidal drives,” Journal of Mechanical Design, vol. 134, 2012.
S. Akehurst, “Torotrak V-Charge CVT driven supercharger- a downsizing enabler?” www.eng.ox.ac.uk/engines/uniceg-presentations/v-charge, April 2017.
J. Crosse, “Torotrak readies V-Charge supercharger for downsized engines,” https://www.autocar.co.uk/car-news/industry/torotrak-readies-v-charge-supercharger-downsized-engines, February 2017.
Green Car Congress, “Testing confirms Torotrak V-Charge variable drive mechanical supercharger enables more ambitious downsizing; 1.0L demo at Aachen,” https://www.greencarcongress.com/2016/10/20161010-torotrak.html, October 2016.
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