Performance and Emissions of a Heavy-Duty Common Rail Direct Injection Engine fueled with Philippine Coconut Methyl Ester (CME) - Diesel Blends

Paper #:
  • 2017-01-0869

  • 2017-03-28
The Philippine Biofuels Act of 2006 (RA 9367) requires commercial diesel fuel to be mixed with Coconut Methyl Ester (CME) in accordance with the current drive of the Philippines stipulated in the Philippine Clean Air Act of 199 (RA 8749). As of 2015, the percentage should be at 5% CME v/v but this is contrary to the current percentage of commercial diesel which is still 2%. Researches done locally to show the performance and emissions of CME-fueled engines are few and thus the basis for increasing the CME percentage is still questionable. This hampers the drive for the further implementation of the policy. The influence of varying percentages of CME blends (2%, 5%, 10%, 15%, 20% v/v) to the performance and emissions of a heavy-duty turbocharged common rail direct injection (CRDI) engine is then determined using an engine dynamometer. The engine is run at steady state on a partial load (50Nm and 250 Nm) and near full load (500Nm). Each run is set with three pedal positions (25%, 50% and 60%) controlled directly from the engine control unit. Results show a significant increase in brake specific fuel consumption at higher percentages of CME with a maximum of 3.16% at higher loads and 25% throttle position. Nitrous Oxides (NOx) is of particular importance in dealing with biofuel methyl esters and is found to significantly increase at higher percentages of CME with a maximum of 8.91% at higher loads across all throttle positions. Other emissions such as carbon monoxide (CO) and hydrocarbons of diesel (HCD) were found to be not significantly affected by the usage of CME.
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