Strategies for Reduction of Harmful Emissions from Diesel Engines

Reduction of harmful exhaust emissions from combustion of fossil fuels from automotive sectors is of prime importance and extensively researched by various strategies. Engine emissions control techniques can be bifurcated in categories of active control techniques and passive control techniques. In the active control techniques, the emissions are controlled in the combustion chamber itself while in the passive control techniques the emissions are controlled after completion of combustion. There are different strategies such as alternative fuels, fuel additives, nanofluids, water-in-diesel etc. commonly used to reduce harmful emissions and improve performance of fossil fuel-based energy systems. The alternative fuels such as alcohol and biodiesel are gaining importance. Biodiesel has certain limitations but blending with alcohol enables the maximum usage of biodiesel in the fuel blends. In this paper active control strategies are highlighted and discussed.