The focus of this study was to experimentally investigate the development of nonlinear cyclic dispersion patterns in spark ignition engines. The results indicated a transition from stochastic behavior to noisy nonlinear determinism as equivalence ratio was decreased to very lean conditions. The transition to nonlinear deterministic behavior appeared to occur via a period-doubling bifurcation se...

<div class="section abstract"><div class="htmlview paragraph">Low temperature heat release (LTHR) has been of interest to researchers for its potential mitigate knock in spark ignition (SI) engines and control auto-ignition advanced compression (ACI) engines. Previous studies have identified investigated LTHR both ACI SI before the main high (HTHR) event by appropriately curating in...

On February 24-26, 2014, the Coordinating Research Council (CRC) hosted a workshop at Hyatt Regency Baltimore, which focused on advanced fuel and engine efficiency. The workshop was co-sponsored by American Petroleum Institute (API) and U.S. Department of Energy (DOE). The main goal of the workshop was to understand the state of the art and identify gaps in current research efforts towards unde...

The spark advance determines the efficiency of spark-ignited (SI) engines by positioning the combustion in relation to the piston motion. Today’s spark-advance controllers are open-loop systems that measure parameters that effect the sparkadvance setting and compensate for their effects. Several parameters influence the best spark-advance setting but it would be too expensive to measure and acc...

in spark ignition (si) engines, the accurate control of air fuel ratio (afr) in the stoichiometric value is required to reduce emission and fuel consumption. the wide operating range, the inherent nonlinearities and the modeling uncertainties of the engine system are the main difficulties arising in the design of afr controller. in this paper, an optimization-based nonlinear control law is anal...

Recent research in laser-induced ignition (LI) of air-fuel mixtures in internal combustion (IC) engines has shown there to be many potential advantages over conventional electrical spark ignition (SI). Spark plugs offer only limited possibilities for optimising engine efficiency, due to their fixed position within a cylinder and the protrusion of electrodes which disturb the cylinder geometry a...