A Turbocharged Dual-Fuel HCCI Engine

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


A 6-cylinder truck engine is modified for turbocharged dual-fuel Homogeneous Charge Compression Ignition (HCCI) engine operation. Two different fuels, ethanol and n-heptane, are used to control the ignition timing. The objective of this study is to demonstrate high load operation of a full-size HCCI engine and to discuss some of the typical constraints associated with HCCI operation. This study proves the possibility to achieve high loads, up to 16 bar Brake Mean Effective Pressure (BMEP), and ultra-low NOdx emissions, using turbo charging and dual fuel. Although the system shows great potential, it is obvious that the lack of inlet air pre heating is a drawback at low loads, where combustion efficiency suffers. At high loads, the low exhaust temperature provides little energy for turbocharging, thus causing pump losses higher than for a comparable diesel engine. Design of turbocharger therefore, is a key issue in order to achieve high loads in combination with high efficiency. In spite of these limitations, brake thermal efficiencies and power rating close to those of the original diesel engine are achieved with significant reduction in NOdx emissions. The maximum efficiency is 41.2%, which is slightly lower than for the original diesel engine.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering


  • HCCI, High Load Operation, Engine, Turbocharged
Original languageEnglish
Title of host publicationSAE Special Publications
PublisherSociety of Automotive Engineers
Number of pages13
Publication statusPublished - 2001 May 7
Publication categoryResearch
EventInternational Spring Fuels and Lubricants Meeting and Exhibition - Orlando, FL, United States
Duration: 2001 May 72001 May 9

Publication series

ISSN (Print)0099-5908


ConferenceInternational Spring Fuels and Lubricants Meeting and Exhibition
CountryUnited States
CityOrlando, FL

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