NDLI: Cycle-to-Cycle Control of HCCI Engines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gregory, M. Shaver Gerdes, J. Christian
Copyright Year	2003
Abstract	With stated benefits ranging from increased thermal efficiency to significantly reduced NOx emissions, Homogeneous Charge Compression Ignition (HCCI) represents a promising combustion strategy for future engines. When achieved by reinducting exhaust gas with a variable valve actuation (VVA) system, however, HCCI possesses nonlinear cycle-to-cycle coupling through the exhaust gas and lacks an easily identified trigger comparable to spark or fuel injection. This makes closed-loop control decidedly nontrivial. To develop a controller for HCCI, the engine cycle is partitioned into five stages: adiabatic, constant pressure induction of re-inducted product and reactant charge; isentropic compression to the point just prior to combustion initiation; constant volume combustion; isentropic expansion of product gases; isentropic exhaust of product gases. Using this framework, a nonlinear low-order model of HCCI combustion is formulated, where the input is the molar ratio of reinducted products to fresh reactants and the output is the peak in-cylinder pressure. Comparison with experimental in-cylinder pressure data shows that the model, while simple, offers reasonable fidelity. Using the nonlinear model, a linearized model and an accompanying LQR controller are formulated and implemented on a more detailed model presented in previous work. Results from these simulations show that the modeling and control approach is indeed successful at tracking a varying desired work output while maintaining a constant desired combustion phasing.
Sponsorship	Dynamic Systems and Control Division
Starting Page	403
Ending Page	412
Page Count	10
File Format	PDF
ISBN	0791837130
DOI	10.1115/IMECE2003-41966
Volume Number	Dynamic Systems and Control, Volumes 1 and 2
Conference Proceedings	ASME 2003 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2003-11-15
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Cycles Compression Electromagnetic induction Control equipment Valves Combustion Homogeneous charge compression ignition engines Fuels Pressure Engines Exhaust systems Emissions Gases Simulation Control modeling Nitrogen oxides Engineering simulation Thermal efficiency Cylinders
Content Type	Text
Resource Type	Article

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