Diesel engines, also known as CI engines, have a wide range of applications as energy converters because of their higher efficiencies. However, diesel engines are an important source of emissions of particulate matter and NOX (PM). A diesel engine is a sort of internal combustion engine like a gas engine. Combustion is another term for burning, as well as body means inside, so that an internal combustion engine is only one in which gas is used inside the key part of the engine (the cylinders) in which energy is generated. This is different from an external burning engine like the old steam locomotives used. The diesel engine probably has the highest thermal efficiency (engine efficiency) of any useful internal or perhaps external combustion engine due to its very high expansion ratio and its inherent lean burn, which allows the heat to dissipate through the additional air. A small loss of efficiency is kept away from the two-stroke non-direct-injection gasoline engines because unburnt gas does not overlap with the valve and therefore no fuel surely goes from the intake/injection on the fumes. Low-speed diesel engines (as used in other applications and ships with relatively little engine mass) can have a thermal efficiency of more than 50%. We are currently experiencing a worldwide oil crisis. Gaseous energy such as natural gas, clean hydrogen gas, coke and biomass-based syngas could be considered renewable sources of energy for diesel engines. This book describes the characteristics of combustion and exhaust. Reliable early detection of malfunctions and failures of any diesel engine parts can completely save the engine from failure and protect high repair costs. Tools for discovering common failure approaches of diesel engines that can identify early signs of failure are discussed in this book.
