Experimental Study on High-load Extension of Gasoline/PODE Dual-fuel RCCI Operation Using Late Intake Valve Closing

Paper #:
  • 2017-01-0754

  • 2017-03-28
The dual-fuel RCCI combustion could achieve high efficiency and low emissions over a wide range of operating conditions. However, further high load extension is limited by the excessive pressure rise rate and soot emission. PODE, as a novel diesel alternative fuel, has the capability to achieve stoichiometric smoke-free RCCI combustion due to its high oxygen content and unique molecule structure. In this study, experimental investigations on high load extension of gasoline/PODE RCCI operation were conducted using the late intake valve closing (LIVC) strategy and intake boosting in a single-cylinder, heavy-duty diesel engine. The experimental results show that the upper load can be effectively extended through boosting and LIVC with gasoline/PODE stoichiometric operation. With the retarding of LIVC timing, higher boosting pressure and lower EGR ratio were required to maintain sufficient available oxygen. The upper load of gasoline/PODE RCCI operation could be extended up to 2.24MPa IMEP, while still maintaining ultra-low smoke/NOx emissions and acceptable peak in-cylinder pressure and pressure rise rate. In addition, stoichiometric combustion also enables the application of a low-cost three-way catalyst to further reduce the HC and CO emissions. However, LIVC results in slight reduction of indicated thermal efficiency (ITE) due to the lower effective compression ratio and more incomplete combustion with stoichiometric operation, thus further combustion optimization is necessary for ITE improvement. The study reveals that gasoline/PODE RCCI offers a very competitive pathway to achieve clean and highly efficient combustion over the full load conditions.
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