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Biodiesel derived from non-edible vegetable oils/tree borne oils hold potential for meeting India's future energy needs by part substitution of Diesel Fuel. This paper investigates performance of 5% blend of commercially available biodiesel (B5) in diesel as fuel for heavy duty vehicles. The test fuel was evaluated on buses with different aspiration technologies viz. naturally aspirated and turbo charged, and the same was compared with neat commercial diesel under different operating conditions like driving cycle, road load simulation (RLS) and wide open throttle (WOT) on chassis dynamometer for power, fuel economy, smoke and soot particle number concentration. Fuel economy was observed to be comparable with B5 in naturally aspirated bus while better fuel economy was observed in case of Turbo charged bus with B5. However, there was a marginal drop in the WOT power (vehicle) with B5 fuel in naturally aspirated bus while the drop was higher with Turbo charged bus.

In this paper, experimental evaluation was carried out on a 6.0 L heavy duty CNG engine which has been optimized for 18 percent hydrogen blended CNG (HCNG). Optimization test results shows that use of HCNG results in reduced CO, THC & CH4 emissions by 39, 25 & 25 percent respectively and increase in NOx by 32 percent vis-a-vis CNG. After optimization the engine was subjected to endurance test of 600 hours as per 15 mode engine simulated city driving cycle with HCNG. The performance & emission characteristics of the engine were analyzed after completion of every 100 hours as per European Transient Cycle (ETC). Test results indicate that there were no significant changes observed in engine power output over the complete endurance test of 600 hrs with HCNG. Specific fuel consumption (SFC) measurements were consistent at all the 15 modes of engine simulated city driving cycle.