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Sumeet Shinde, Shishir Srivastava


Major challenged faced by most of the engine manufacturers with improving performance of heavy duty diesel vehicles is to meet the stringent exhaust emission norms, with least modification in design. Heavy duty diesel engines have been recently equipped with various electronically controlled components, such as turbocharger, fuel injection pump (FIP), exhaust gas recirculation (EGR), etc. Simplicity of design is to be maintained by optimizing the available emission control technique in order to achieve the emission norms in cost effective manner. However, the selection of combustion parameters for optimization is extremely tedious because an engine has so many parameters to be optimized and their interactions are complicated.


This paper deals with combustion parameters for optimizing 75hp engine in order to fulfil Bharat Stage (Trem) III A emission norms, which was done on 4 cylinder 3.68 litre turbocharged engine giving power output of 55.6 kW @ 2200 revolution per minute (RPM). The norms were achieved in a cost effective manner by adopting appropriate injection timing, cooled EGR, in-cylinder head swirl, high pressure pipe (HPP)  for fuel delivery and fuel injection pump. By the help of turbocharger mapping can change the pressure ratio, mass flow rate of air for achieving good combustion performance, emission and brake specific fuel consumption (bsfc). Injection timing was retarded in order to reduce the in-cylinder temperature and with the help of cold EGR flow the nitrogen oxide (NOx) value was found to be within the limits. With proper selection of combustion parameters, the required performance was achieved and emission norms of Bharat Stage (Trem) III A was satisfied. An improvement of 12% in fuel consumption and a reduction of 50% in smoke levels was observed over the base engine after optimizing all the parameters.


Emission; turbocharger; EGR; injection parameters; swirl

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