A Lean Burn Gasoline Fueled Pre-Chamber Jet Ignition Combustion System Achieving High Efficiency and Low NOx at Part Load MAHLE Powertrain

Format:

Conference/Event

Author/Creator:

Attard, Attard, author.

Contributor:

Blaxill, Hugh

Conference Name:

SAE 2012 World Congress & Exhibition (2012-04-24 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

Turbulent Jet Ignition is an advanced spark-initiatedpre-chamber combustion system for otherwise standard spark ignitionengines. Combustion in the main chamber is initiated by jets ofpartially combusted (reacting) pre-chamber products which provide ahigh energy ignition source. The resultant widely distributedignition sites allow relatively small flame travel distancesenabling short combustion durations and high burn rates.Demonstrated benefits include ultra lean operation (λ2) at partload and high load knock limit extension.Previous jet ignition experimental results have highlighted highthermal efficiencies, high load capability and near-zero engine-outNOx emissions in a standard contemporary engine platform. Althoughprevious results of this system have been very promising, the mainhurdle has been the need for a dual fuel system, with liquidgasoline used in the main combustion chamber and small fractions ofgaseous propane in the pre-chamber. Initial attempts in replacingthe pre-chamber gaseous propane with liquid gasoline wereproblematic, although engine operation was successful at someoperating conditions. The poor mixture preparation with liquidgasoline inside the small pre-chamber cavity due to the limitedproduction injector hardware somewhat compromised the thermalefficiency, resulting in slight elevations in NOx emissions. Sincespecialized pre-chamber injector hardware was not available forevaluation, the purpose of this paper is to demonstrate that thiscombustion system can operate robustly using gasoline, withvaporized gasoline found to be a successful pre-chamber fuelsubstitute. With this concept at part load, the test enginerecorded a 41.4% peak thermal efficiency, ultra lean operation pastlambda 2.1, single-digit engine-out NOx emissions and a 20% peakfuel economy improvement over the baseline spark ignitionsystem

Notes:

Vendor supplied data

Publisher Number:

2012-01-1146

Access Restriction:

Restricted for use by site license