The Potential of Gasoline Fueled Pre Chamber Ignition Combined with Elevated Compression Ratio

Andreas Stadler, Henning Sauerland, Martin Härtl, Georg Wachtmeister

Research output: Contribution to journalConference articlepeer-review

27 Scopus citations

Abstract

Pre-chamber ignition is a method to simultaneously increase the thermal efficiency and to meet ever more stringent emission regulations at the same time. In this study, a single cylinder research engine is equipped with a tailored pre-chamber ignition system and operated at two different compression ratios, namely 10.5 and 14.2. While most studies on gasoline pre-chamber ignition employ port fuel injection, in this work, the main fuel quantity is introduced by side direct injection into the combustion chamber to fully exploit the knock mitigation effect. Different pre-chamber design variants are evaluated considering both unfueled and gasoline-fueled operation. As for the latter, the influence of the fuel amount supplied to the pre-chamber is discussed. Due to its principle, the pre-chamber ignition system increases combustion speeds by generating enhanced in-cylinder turbulence and multiple ignition sites. This property proves to be an effective measure to mitigate knocking effects. It is shown that less spark retard compared to conventional spark ignition allows to exploit the efficiency benefit of elevated compression ratios also in high load operation for stoichiometric mixtures. Furthermore, auxiliary fueling of the pre-chamber enables ultra-lean combustion (λ=2.0) with very low NOx emission levels. Apart from decreased throttling losses lean burn assists to further suppress knocking in case of elevated compression ratios. Finally, it is demonstrated that the combination of ultra-lean combustion and elevated compression ratio leads to a significant improvement of the indicated efficiency with peak values of about 43 %. Higher PN emissions in low load and increased heat losses remain challenges of the used pre-chamber ignition system.

Original languageEnglish
JournalSAE Technical Papers
Volume2020-April
Issue numberApril
DOIs
StatePublished - 14 Apr 2020
EventSAE 2020 World Congress Experience, WCX 2020 - Detroit, United States
Duration: 21 Apr 202023 Apr 2020

Fingerprint

Dive into the research topics of 'The Potential of Gasoline Fueled Pre Chamber Ignition Combined with Elevated Compression Ratio'. Together they form a unique fingerprint.

Cite this