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Drive
cycles
Emission levels
and fuel economy are influenced by a number of factors, such as
acceleration rates, braking distance and amount of idle (or dwell).
As such, the drive cycle has a significant effect on measured emission
levels and fuel economy.
Historically,
a majority of emission testing on urban buses has been conducted
on the Central Business District (CBD) drive cycle. However, the
CBD cycle is not necessarily reflective of actual in-use operation
of urban buses. So, in addition to CBD testing, the project team
developed the Manhattan cycle which contains patterns similar to
the acceleration and deceleration rates used during actual in-service
use. Four other testing cycles were used during the program. These
include the New York Bus (NY Bus) cycle (similar to the Manhattan
but with a lower average speed), the New York Composite cycle (contains
a wider range of acceleration and deceleration rates than NY Bus)
and two routes derived from actual in-service airport shuttle routes,
Route #22, and Route #77.
Detailed information
on the drive cycles can be found in the full Emissions
Report.
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