Dynamic optimization of load step transient response of a turbocharged spark ignition engine focusing on valves timing

Document Type : English

Authors

Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, 84175-119, Iran

Abstract

Demand increase for reduction of fuel consumption and emissions of internal combustion engines has caused technology development in the automobile industry. A successful solution is downsizing the internal combustion engines and adding turbochargers to them. One of the consequences of adding turbocharger to the engine is slower transient response of the engine in comparison to the naturally aspirated engines. In this paper, the engine simulation is done in one-dimensional software GT-POWER and the torque transient response is being focused. For optimization, the coupling between two software of GT-POWER and MATLAB SIMULINK is used to find a rapid way for calculation of a proper strategy in order to utilize variable valve timing (VVT) technology during the transient. Variable valve timing in this study refers to opening and closing timing of inlet and exhaust valves. The optimization target is to maximize the torque integral during time interval of the transient. The transient in this paper is the one in which the engine speed is constant and the load increases rapidly and suddenly to a special value (step increase of load). Improved genetic algorithm is used for optimization. The studied engine is 1.65 liters EF7-TC which is a spark ignition engine equipped with turbocharger.

Keywords


 
[1] Kakaee, A., & Keshavarz, M. (2012). Comparison the sensitivity analysis and conjugate gradient algorithms for optimization of opening and closing angles of valves to reduce fuel consumption in XU7/L3 engine.
[2] Shayler, P. J., & Alger, L. (2007). Experimental investigations of intake and exhaust valve timing effects on charge dilution by residuals, fuel consumption and emissions at part load (No. 2007-01-0478). SAE Technical Paper.
[3] NAGAO, F., NishiwaKI, K., & YOKOYAMA, F. (1969). Relation between Inlet Valve Closing Angle and Volumetric Efficiency of a Four-Stroke Engine. Bulletin of JSME12(52), 894-901.
 [4] Asmus, T. W. (1982). Valve events and engine operation. SAE transactions, 2520-2533.
[5]  Li, L., Tao, J., Wang, Y., Su, Y., & Xiao, M. (2001). Effects of intake valve closing timing on gasoline engine performance and emissions. SAE Transactions, 2270-2276.
[6]  Tuttle, J. H. (1982). Controlling engine load by means of early intake-valve closing. SAE transactions, 1648-1662.
[7] Mianzo, L., & Peng.H. (2000) Modeling and Control of Variable Valve Engine, Variable Valve Actuation. American control conference Chicago.
[8] Leroy, T., Chauvin, J., & Petit, N. (2009). Motion planning for experimental air path control of a variable-valve-timing spark ignition engine. Control engineering practice17(12), 1432-1439.
[9] Wu, B., Prucka., R.G., Filipi, Z.S., Kramer, D.M., & Ohl, G.L. (2005). Cam-Phasing Optimization Using Artificial Neural Network as Surrogate Models-Maximizing Torque Output. SAE paper, 01, 3757. 2005
[10] Fontana, G., & Galloni, E. (2009). Variable valve timing for fuel economy improvement in a small spark-ignition engine. Applied Energy86(1), 96-105.
 [11] Ericsson, G., Angstrom, H. E., & Westin, F. (2010). Optimizing the transient of an SI-engine equipped with variable cam timing and variable turbine. SAE International Journal of Engines3(1), 903-915.
[12] Bozza, F., Gimelli, A., Strazzullo, L., Torella, E., & Cascone, C. (2007). Steady-state and transient operation simulation of a “downsized” turbocharged SI engine (No. 2007-01-0381). SAE Technical Paper.
[13] Lefebvre, A., & Guilain, S. (2005). Modelling and measurement of the transient response of a turbocharged SI engine (No. 2005-01-0691). SAE Technical Paper.
[14] Kleeberg, H., Tomazic, D., Lang, O., & Habermann, K. (2006). Future potential and development methods for high output turbocharged direct injected gasoline engines (No. 2006-01-0046). SAE Technical Paper.
[15] Eriksson, L., Lindell, T., Leufven, O., & Thomasson, A. (2012). Scalable component-based modeling for optimizing engines with supercharging, E-boost and turbocompound concepts. SAE International Journal of Engines5(2), 579-595.
[16] Xu, X., Liu, J., Wang, Y., Zhao, Z., Xia, X., & Fu, J. (2011, April). A research of turbocharged gasoline transient response. In 2011 International Conference on Electric Information and Control Engineering (pp. 4719-4722). IEEE.
[17] GT-Power v7.3 user’s manual
[18] Heywood, J. B. (2018). Internal combustion engine fundamentals. McGraw-Hill Education.
[19] Bodin-Ek, E. (2008). Kalibrering av en transient GT-Power modell av en SI PFI turbo motor.
[20] Wiebe, I. (1964). Halbempirische formel durch die verbrennungsgeschwindigkeit. Kraftstoffaufbereitung und Verbrennung bei Dieselmotoren, Spring-Verlag.
[21] AKakee, A. H., Sharifipour, S., Mashadi, B., Keshavarz, M., & Paykani, A. (2015). Optimization of spark timing and air-fuel ratio of an SI engine with variable valve timing using genetic algorithm and steepest descend method. UPB Sci Bull Ser D Mech Eng77(1), 61-76.
[22] Martensson, J., & Flardh, O. (2010). Modeling the effect of variable cam phasing on volumetric efficiency, scavenging and torque generation (No. 2010-01-1190). SAE Technical Paper.