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Fuel efficiency is one of the most important customer requirement in Indian market as well as very crucial to meet the upcoming regulation like CAFÉ for Indian Automotive manufacturers. Most of the technology changes to meet this challenge, always come with a cost penalty with hardware addition. To counter the above challenge, a strategy has been identified in the EMS software that will dynamically adapt the spark timing based on fuel octane rating. This strategy has resulted in fuel efficiency improvement on Modified Indian Drive Cycle on chassis dynamometer test and as well as on real life road tests using fuels with various octane number.

Experimental investigations were carried out to study the effect of the addition of an ignition improver with a bioethanol diesel emulsion, on the performance and emission behavior of a single-cylinder, 4-stroke, air-cooled, direct-injection (DI) diesel engine, with a rated power of 4.4 kW at a constant speed of 1500 rpm. Bioethanol was produced from the madhuca indica flower, which is proposed as a new feed stock. 15% bioethanol was emulsified with 84% diesel on a volume basis with the help of a surfactant of 1% to get the emulsion named as BDE15. The ignition improver used in the experimentation was diethyl ether (DEE) whose cetane number is greater than 125. 1% and 2% of DEE was added to the bioethanol diesel emulsion named as BDE+DEE1% and BDE+DEE2% respectively. The performance and emission results of the engine fueled with BDE15, with BDE+DEE1% and BDE+DEE2% were compared with those of diesel operation, and are presented in the paper.