Extension of the Lean Limit of Gasoline Engines Under Part Load by
Using Hot Surface Assisted Spark Ignition (HSASI) 2022-32-0051
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.
Citation: Holzberger, S., Kettner, M., and Kirchberger, R., "Extension of the Lean Limit of Gasoline Engines Under Part Load by Using Hot Surface Assisted Spark Ignition (HSASI)," SAE Int. J. Adv. & Curr. Prac. in Mobility 5(5):1766-1776, 2023, https://doi.org/10.4271/2022-32-0051. Download Citation
Author(s):
Sascha Holzberger, Maurice Kettner, Roland Kirchberger
Affiliated:
University of Applied Sciences Karlsruhe, Graz University of Technology
Pages: 11
Event:
The 26th Small Powertrains and Energy Systems Technology Conference
e-ISSN:
2641-9645
Also in:
SAE International Journal of Advances and Current Practices in Mobility-V132-99EJ
Related Topics:
Spark ignition engines
Single cylinder engines
Combustion and combustion processes
Emissions measurement
Ignition systems
Lean burn engines
Engines
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