Methanol Fuel Testing on Port Fuel Injected Internal-only EGR, HPL-EGR and D-EGR® Engine Configurations

Paper #:
  • 2017-01-2285

Published:
  • 2017-10-08
Abstract:
The primary focus of this investigation was to determine the hydrogen reformation, efficiency and knock mitigation benefits of methanol-fueled Dedicated EGR operation, when compared to other EGR types. A 2.0 L turbocharged port fuel injected engine was operated with internal EGR, low-pressure loop (LPL) EGR and Dedicated EGR (D-EGR®) configurations. The internal, LPL-EGR, and D-EGR configurations were operated on neat methanol to display the relative benefit of D-EGR over other EGR types, while the DEGR configuration was also tested on high octane gasoline to highlight the differences and benefits to D-EGR operation of methanol compared to gasoline. Additional sub-tasks of the work were to investigate combustion stability, ignition energy requirements and burn rates. It was found that methanol did not increase its H2 yield rate for a given D-EGR cylinder equivalence ratio, even though the H:C ratio of methanol is over twice typical gasoline. Although the H2 yield rate did not increase over gasoline for a given equivalence ratio, the rich misfire limit of methanol fueled D-EGR was found to be significantly higher than gasoline, yielding higher H2 levels. Methanol-fueled D-EGR was found to extend the maximum load of the engine by over 2 bar BMEP, suppress hot spot pre-ignition, improve CoV of IMEP, reduce burn duration, increase dilution tolerance and improve efficiency.
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