Continue Internal Combustion Engines Compression ratio,r MEP r- max BDC min 'min Mean effective pressure,MEP MEP= Wnet net work for one cycle V-V m min displacement volume Notes: 。 MEP would produce the same net work with constant pressure as for actual cycle (includes both expansion and compression) want high MEP (high power density) 上游充通大率 May15,2018 10 HANGHAI HAO TONG LINIVERSITYMay 15, 2018 10 Continue Internal Combustion Engines Compression ratio, r Mean effective pressure, MEP Notes: • MEP would produce the same net work with constant pressure as for actual cycle (includes both expansion and compression) • want high MEP (high power density) max BDC min TDC V V r V V   net max min W net work for one cycle MEP V V displacement volume    v p MEP Vmin Vmax