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The global economy strives towards clean energy in the phase of climate change and the automotive industry is researching in improving the efficiency of automobiles. In respect to that, direct injection types of diesel engines are becoming popular. However, improving the performance and reducing the CO₂ emission of a vehicle is necessary in order to meet the fuel economy targets. A turbocharged common rail direct injection diesel engine is selected for investigation purpose to study its performance and average fuel consumption values over typical driving cycles (UDC, EUDC and BS IV). Experimental work is carried out to collect the vehicle performance and fuel economy test data. The simulation tools are used to speed up the product development process and to bring the new products into the market. The AVL Cruise simulation technique allows us to speed up the optimization of vehicle and powertrain parameters in an early stage of the product development process.

In today's competitive scenario in automotive industry, the customer expectations about refinement levels are becoming independent of the class & cost of the car. Customers directly co-relate the quality of the vehicle to the overall refinement levels. At the same time there are ever increasing & hard pressing demands to achieve refinement targets in minimum possible cost. One of the parameter for vehicle refinement is reduction of BSR (Buzz, Squeak & Rattle). It is observed that after suppressing the mechanical rattles, fluid borne noise surface out. In all fluid borne noise, hydraulic power steering system rattle noise is one of the critical refinement issues, having high ranking on customer irritant list. Noise attenuation cables [1] in power steering hydraulic hose assemblies in pressure & return line is a proven solution to this problem but not a cost effective one.