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With growing fuel prices and global warming, fuel economy improvement and reduced emissions are becoming order of the day. Automobile manufacturers around the world are in increasing pressure to achieve the same, also keeping in account the stiff timelines required in the product developmental cycle. Condensed duty cycle that is representative of several days of actual real life running is developed for quicker fuel economy tuning on a chassis dynamometer. This paper presents a new methodology to obtain a synthetic drive duty cycle, which matches engine operating conditions of the actual real life cycle accurately and thereby providing a more accurate match in fuel economy. Drive duty cycle (vehicle velocity profile) used in this study is extracted from the instrumented vehicle in the real traffic condition (peak/lean hour) of major cities in India at different location/load conditions. Each recorded trip is further divided into micro trips.

The present study is to evaluate the performance & emission characteristics of biodiesel on a 2.6L turbocharged common rail direct injection engine powered on Sports utility vehicle (SUV). The effect of neat biodiesel and its blends with diesel at various ratios was evaluated. The study was extended to analyze combustion characteristics using pressure time history with various blends. This paper elaborate the effect of biodiesel on both engine & vehicle level. Impact on fuel economy, noise level and drivability was also discussed. Experimental results revealed significant reduction of power throughout the operating range while running with biodiesel. So the engine injection strategy was optimized specially for biodiesel to obtain the desired performance & emission. Engine performance results were discussed based on the analysis of heat release, which made it possible to give more precise information about the combustion process.

Biodiesel is a nontoxic, biodegradable and renewable fuel with a potential to reduce engine exhaust emissions. Biodiesel used for the current work is jatropha methyl ester (JME). Earlier research, when biodiesel used in neat form, showed deterioration of performance when compared with diesel. The scope of current work is to match the existing diesel performance in all aspects, when the vehicle is fuelled by neat biodiesel (Jatropha). Matching diesel performance with biodiesel was done by remapping electronic control module. This results in power increase, but the vehicle emissions and noise level tends to increase. So tradeoff between performance and emission is achieved by optimizing the engine parameters. Comparative performance was taken with normal diesel and biodiesel in neat form. Different engine characteristics like torque, power, thermal efficiency, exhaust temperature and noise along with emission such as HC, CO, NOx, and Smoke were studied.