As fuel prices escalate direct injection (DI) engines are expected to gain in popularity, yet ongoing research challenges remain in improving the technology for commercial applications. This two volume set reviews the science and technology of different types of DI combustion engines and their fuels. Volume 2 investigates diesel DI combustion engines, which despite their commercial success are facing ever more stringent emission legislation worldwide. Three main sections address light-duty diesel engines; heavy-duty diesel engines; and the all-important exhaust emission control strategies, including combustion diagnostics and modelling.