Recent CAV Research into Noise, Emissions, and Fuel Economy of Diesel Engines

The contribution to the external noise from the combustion process has been considered in relation to the gaseous emissions, smoke and specific fuel consumption. To satisfy the requirements of proposed legislation in different markets, whilst maintaining economical operation, the fuel injection equipment for a diesel engine must compromise between several conflicting requirements. The conflicts are presented in the form of “trade-off” curves over a range of dynamic injection timings. Four means to achieve better “trade-off” curves have been investigated:- higher rate of injection, fumigation, turbocharging, and turbocharging combined with a higher rate of injection.