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In this paper, Authors tried to investigate the influence of Low Temperature EGR (LtEGR) on NOx, PM emissions and fuel efficiency in NEDC 120 cycle. Sports Utility Vehicle (SUV) less than 3.5T vehicle selected for investigation of LtEGR. The existing water cooling circuit modified to suitable to handle the LtEGR concept without changing the existing EGR cooler. Cooled EGR technology has two benefits in terms of handling high EGR ratios and more fresh air within the engine displacement. Under this assumption separate LtEGR layout was prepared for the evolution of superior EGR cooling technologies and low pressure EGR.

Direct injection diesel engine offers better Performance and fuel economy benefit over gasoline engine. Use of performance prediction software helps to reduce engine emission development time, effort and cost of development. In the present paper, 2.2 Liter, 4 cylinder diesel engine was upgraded for 25% higher power, 18% higher torque and emission from Euro3 to Euro4. Base engine performance prediction was done using AVL Boost software. This Model was validated by base engine performance test results. Boost model was used for parametric study to predict target engine performance. Vehicle simulation model was built with use of AVL Cruise software and run with NEDC test cycle. 14 mode steady state speed-load points of engine were obtained with from NEDC cycle with time weightage factor. Engine hardware like turbocharger, injector, piston cavity, EGR cooler and pilot injection strategy were used for engine power and emission optimization on engine test bed.