Charge dilution by lean-burn is one way to increase the efficiency of spark ignition engines while reducing NOx emissions. This work focuses on increasing the flammability of lean mixtures inside a passive pre-chamber spark plug by elevating its temperature with the help of a controllable hot surface integrated into the pre-chamber. Thus, an extension of the lean limit under part load is aimed for. A pre-chamber spark plug prototype with an integrated, controllable glow plug was developed, called Hot Surface Assisted Spark Ignition (HSASI). Experimental investigations were conducted on a single-cylinder engine at the Karlsruhe University of Applied Sciences. Operating modes with an active glow plug (HSASI) and a non-active glow plug were compared. The lean limit for both operation modes were determined under part load. NOx, CO and THC emissions were measured for different air-fuel equivalence ratios λ. The lean limit is extended by more than 0.1 in λ at low loads with HSASI operation. At constant λ, lower CO and THC emissions are achieved under HSASI operation than in operation with a non-active glow plug. NOx-emissions are higher with an active glow plug at lower λ and align with higher λ. HSASI operation shows higher combustion stability, as combustion in the pre-chamber is accelerated and flame quenching in the pre-chamber is reduced.
Extension of the Lean Limit of Gasoline Engines Under Part Load by Using Hot Surface Assisted Spark Ignition (HSASI)
Sae Int. J. Adv. and Curr. Prac. in Mobility
The 26th Small Powertrains and Energy Systems Technology Conference ; 2022
Sae International Journal of Advances and Current Practices in Mobility ; 5 , 5 ; 1766-1776
2022-01-09
11 pages
Conference paper
English
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