Development of a Direct Injection-Homogeneous Charge Compression Ignition (DI-HCCI) Heavy Duty DiesOtto Engine by using Effervescent Atomization 2009-01-2701

A new High Speed Direct Injection-Homogeneous Charge Compression Ignition DIESOTTO engine is developed to eliminate exhaust emissions, to reduce fuel consumption and for replacing both conventional SI and CI engines with “greener” alternatives. Air assisted effervescent atomization was used for creating Mixing Controlled Lean Premixed Homogeneous Combustion in a conventional 4 Cylinder Turbocharged Inter-cooled 3.5 L CRDI diesel engine fitted with a modified low heat loss piston having re-entrant toroidal squish lip reversed flow, combustion chamber for simultaneously reducing No_x, Smoke, CO, CO₂, HC and fuel consumption. Engine performance parameters such as peak rate of heat release (ROHR), brake specific fuel consumption (BSFC), NO_x, CO, CO₂, THC and Particulates were measured and quantified for evaluating the performance of this new combustion system. Results from a conventional CRDI with and without the modified combustion system at two different speeds were obtained to show the comparison of performance. Results showed that as the mode of combustion in a diesel engine was changed from the conventional CRDI to that of DI-HCCI (DIESOTTO), not only fuel consumption was reduced by 20-30% but NO_x, by 99%, HC by 60–80%, CO 60–80%, CO₂ by 25–30% and Particulates 99.9%. Thus a new perspective of DI-HSD (HSDI) diesel engine operation has been opened by suppressing knocking tendency for a high performance greener DI-HCCI (DIESOTTO) engine. A new regime of high performance operation of CRDI Diesel Engines is realized by using this new concept of DI-HCCI (DIESOTTO) Combustion.