An Investigation into Cycle-to-Cycle Variations of IMEP using External EGR and Rebreathed EGR in an HCCI Engine, Based on Experimental and Single-Zone Modeling

Paper #:
  • 2015-01-1805

Published:
  • 2015-09-01
DOI:
  • 10.4271/2015-01-1805
Citation:
Jung, D. and Iida, N., "An Investigation into Cycle-to-Cycle Variations of IMEP using External EGR and Rebreathed EGR in an HCCI Engine, Based on Experimental and Single-Zone Modeling," SAE Technical Paper 2015-01-1805, 2015, doi:10.4271/2015-01-1805.
Affiliated:
Pages:
9
Abstract:
The characteristics of cycle-to-cycle variations of indicated mean effective pressure (IMEP) with combustion-phasing retard have been investigated experimentally and computationally in an homogeneous charge compression ignition (HCCI) engine using dimethyl ether (DME). The experiments were conducted in a single-cylinder HCCI research engine equipped with an exhaust gas recirculation (EGR) passage for external EGR and a two-stage exhaust cam for rebreathed EGR. To understand the chemical effects of rebreathed EGR, which is assumed to contribute to the autoignition enhancement, the computations were performed with a single-zone model of CHEMKIN using a chemical-kinetic mechanism developed by combining DME mechanism and NOx submechanism.
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