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Development of a pre-chamber for ultra-lean operation of gasoline engines

Abstract : Combustion engines in hybridized powertrains continue to require further reductions in fuel consumption and emissions. Lean operation represents a major step towards increasing gasoline engine efficiency. Here, pre-chamber jet ignition offers the potential to assure a reliable ignition and combustion process. This paper describes the development of such a system. Numerical approaches allow for an efficient development process of the pre-chamber layout. Thus, the pre-chamber geometry is thoroughly optimized with respect to the combustion quality. Based thereupon, different pre-chamber layouts were experimentally evaluated. Optical investigations serve to conclude on burn rate and particulate emissions. Having found a specific layout to achieve stable combustion (COV<1.5%) for lean (λ > 3) operation and specific NOx emissions below 0.1 g/kWh a synthesis of all findings serves to define the final concept. The resulting combustion system offers high efficiencies in the entire engine map and thus excellent conditions for further improving the fuel consumption.
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Submitted on : Tuesday, March 10, 2020 - 7:26:04 PM
Last modification on : Thursday, March 12, 2020 - 2:12:42 PM
Long-term archiving on: : Thursday, June 11, 2020 - 5:02:21 PM


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  • HAL Id : hal-02504571, version 1


Knut Habermann, Bastian Morcinkowski, Christoph Müller, Christof Schernus, Tolga Uhlmann. Development of a pre-chamber for ultra-lean operation of gasoline engines. Proceedings of 8th Transport Research Arena TRA 2020, April 27-30, 2020, Helsinki, Finland, Apr 2020, Helsinki, Finland. ⟨hal-02504571⟩



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