Opposed-piston (OP) engines were once widely used in ground and aviation applications and continue to be used today on ships. Offering both fuel efficiency and cost benefits over conventional, four-stroke engines, the OP architecture also features size and weight advantages. Despite these advantages, however, historical OP engines have struggled with emissions and oil consumption. Using modern technology, science and engineering, Achates Power has overcome these challenges. The result: an opposed-piston, two-stroke diesel engine design that provides a step-function improvement in brake thermal efficiency compared to conventional engines while meeting the most stringent, mandated emissions requirements.
The Indian government is introducing Bharat Stage VI (BS-VI) emissions standards (equivalent to Euro VI standards) from 2020, completely bypassing Stage V standards. For commercial vehicles with diesel engines, these standards will reduce the NOx emissions by 88% and Particulate Matter (PM) emissions by 66% from current BS IV standards. Table 1 shows tailpipe emissions and test cycles for BS IV and BS VI emissions standards [1]. Table 1. Tailpipe emissions standards for India.
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