Biodiesel, produced from renewable and often domestic
sources, represents a more sustainable source of energy and will
therefore play an increasingly significant role in providing the
energy requirements for transportation. Therefore, more and more
researches are focused on the biodiesel engine performances and
its emissions in the past 10 years. Although there have always been
inconsistent trends for biodiesel engine performances and its emissions
due to the different tested engines, the different operating
conditions or driving cycles, the different used biodiesel or reference
diesel, the different measurement techniques or instruments,
etc., the following general conclusions could be drawn according
to analysis and summary of the massive related literatures in this
work: