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To provide optimal performance of a small DI diesel in relation to noise, emissions and fuel economy, an experimental investigation was carried out using Taguchi methods. A single cylinder 3.5 kW diesel was selected for performance test at different engine speeds, loads and static injection timings. These controlled parameters were varied at three levels and the resulting changes in response variables viz. engine noise, smoke, HC, NOx, CO, CO2 emissions and fuel economy (b.s.f.c) were observed. The levels for low noise, smoke, emissions and b.s.f.c could be predicted and relevant combination of controlled parameters specified. Confirmation engine runs were carried out and the results showed good agreement with the predicted optimized quantities of interest based on Taguchi analysis. The effect of engine parameters to the above responses was evaluated in terms of percent contributions by using analysis of variance.

There are only few studies which address specifically to noise of small engines, and still fewer to noise and smoke both. In this paper Noise-Smoke-Fuel economy correlation study for a small DI diesel has been attempted. The effects of load, speed and injection timing on these parameters are discussed. A common basis for study of Noise and Smoke generation in a diesel engine has been presented. A definite correlation between combustion index with noise and smoke is obtained.