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Sufficient Condition on Valve Timing for Robust Load Transients in HCCI Engines
Technical Paper
2010-01-1243
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Homogeneous Charge Compression Ignition (HCCI) combustion is known for its significant fuel economy benefit with near-zero NOx and particulate emissions. Stable HCCI combustion relies on a well-controlled temperature and composition of the cylinder charge at the intake valve closing that in turn requires a precise coordination of all engine inputs. In this paper, the HCCI combustion is realized by retaining hot residual from the previous combustion event using the recompression valve strategy. The recompression valve strategy closes the exhaust valves before the top dead center and opens the intake valves at an angle symmetric to the exhaust valve closing. Depending on the engine load, different valve open/close timings with respect to the crank position are used to trap different amounts of residual gases. It is critical to coordinate the change in the valve open/close timings with the change in the injected fuel quantity during load transients in order to maintain stable combustion. In this paper, a control-oriented engine model is used to establish a sufficient condition for valve timing change relative to the fuel change that guarantees combustion stability during load transients in HCCI engines. The sufficient condition is then experimentally validated in a single-cylinder HCCI engine during transients with a step change in load demand.
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Kang, J., Chang, C., and Kuo, T., "Sufficient Condition on Valve Timing for Robust Load Transients in HCCI Engines," SAE Technical Paper 2010-01-1243, 2010, https://doi.org/10.4271/2010-01-1243.Also In
References
- “HCCI - Challenges in Transient Vehicle Operation” Alt M. Grebe U. Rayl A. B. Kang J. Chang C. MTZ-Conference Motor Muenchen 2008
- “A Mean-Value Model for Control of Homogeneous Charge Compression Ignition (HCCI) Engines” Rausen D.J. Stefanopoulou A.G. Kang J-M. Eng J.A. Kuo T-W. IEEE Proceedings of 2004 American Control Conference 2004
- Kang, J.-M. “Sensitivity Analysis of Auto-ignited Combustion in HCCI Engines,” SAE Technical Paper 2010-01-0573 2010
- Internal Combustion Engine Fundamentals Heywood J. McGraw-Hill 1988
- “Experiments, Stability and System Identification for Dynamic Regulation of Auto-ignition in HCCI Engines,” Chiang C. J. Ph.D. Preliminary Report University of Michigan Nov. 2004
- Najt, P.M. Foster, D.E. “Compression-Ignited Homogeneous Charge Combustion,” SAE Technical Paper 830264 1983
- “Steady-state multiplicity and stability of thermal equilibria in homogeneous charge compression ignition (hcci) engines” Chiang C. J. Stefanopoulou A. G. Proceedings of the 43rd IEEE Conference on Decision and Control 2 1676 1681 14-17 Dec. 2004
- “Stability analysis in homogeneous charge compression ignition (hcci) engines with high dilution” Chiang C. J. Stefanopoulou A. G. IEEE Transactions on Control Systems Technology 15 2 209 219 March 2007