Addressing nonlinear combustion instabilities in highly dilute spark ignition engine operation

"Dilute operation is a promising approach for increasing spark-ignition engine efficiency, in the form of either lean burn (air dilution) or EGR (inert dilution). High levels of charge dilution, however, lead to cyclic variability that is largely deterministic in nature. The determinism and nonlinear nature of the system indicate that it should be possible to reduce the cycle-to-cycle variations by implementing an electronic controller. Several needs arise when considering the development of such a controller. Three topics of interest are covered herein. First, a method of analysis for nonlinear dynamical systems is applied to engine data in order to estimate the effect that a controller could have by removing the cycles that contribute to repeated, deterministic sequences...Second, the sensitivity of the engine to variations in control input is evaluated by examining a FFT of heat release data when the injected fuel mass is perturbed in a periodic manner...Finally, a combined thermodynamic and turbulent mass entrainment model was developed to predict energy release for many consecutive engine cycles"--Abstract, page iii.

Name thesis:degree_name

Ph. D. in Mechanical Engineering

Grantor

Missouri University of Science and Technology

Year dc:date.available

2016

Author dc:creator

• Kaul, Brian C.

• Exhaust gas recirculation (EGR)
• Lean burn
• Mechanical Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/1889

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-2891