1987-11-01

Fuel Economy and Emissions Potential of a City Bus, Regenerative Power Train 872267

Several years of studies and experimentation commencing in 1977 at the Canadian National Research Council, have culminated in the construction of a regenerative power train of the parallel hybrid type.This paper presents the results of fuel economy tests conducted with the power train as installed in a North American City Bus.Testing was carried out using the Arterial and City Business District phases of the ADB cycles, together with a 5 stop per mile, 30 mph (48 km/h) cycle. Interestingly, with an unmodified bus, the 30 mph cycle was found to require 19% more fuel than the cycle average of the Arterial and City Business District Phases.In comparison with the same bus operating without the benefit of the regeneration package, a reduction in fuel consumption of some 17% was obtained.Even better comparative results are expected of the same system when used in typical city driving situations.A review of the energy balance in the current system, indicates that significant performance enhancements are feasible for a system of this type.In addition to the reduction of fuel consumed, a corresponding reduction in the exhaust gas emissions and smoke is achieved. The system also provides the possibility of reducing the required engine power rating to achieve a given vehicle performance.

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