Demonstrating Optimum HCCI Combustion with Advanced Control Technology
Date Published: 2009-06-15
Paper Number:2009-01-1885
DOI: 10.4271/2009-01-1885
Citation:
Flowers, D., Killingsworth, N., Espinosa-Loza, F., Martinez-Frias, J. et al., "Demonstrating Optimum HCCI Combustion with Advanced Control Technology," SAE Technical Paper 2009-01-1885, 2009, doi:10.4271/2009-01-1885.
We have converted a Caterpillar 3406 natural gas spark ignited engine to HCCI mode and used it as a test bed for demonstrating advanced control methodologies. Converting the engine required modification of most engine systems: piston geometry, starting, fueling, boosting, and (most importantly) controls. We implemented a thermal management system consisting of a recuperator that transfers heat from exhaust to intake gases and a dual intake manifold that permits precise cylinder-by-cylinder ignition control.
Advanced control methodologies are used for (1) minimizing cylinder-to-cylinder combustion timing differences caused by small variations in temperature or compression ratio; (2) finding the combustion timing that minimizes fuel consumption; and (3) tuning the controller parameters to improve transient response. Tasks 2 and 3 were accomplished with extremum seeking, a non-model- based optimization scheme that may help deliver a practical solution to the challenging problem of HCCI engine control.
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