TARC to Host 2010 Emissions Project
KCFC
member TARC (Transit Authority of River City) has teamed
with Cummins, Inc and Nova Bus to provide actual performance
data of 2010 emissions compliant transit equipment in
Louisville.
The NOVA
LFS unit is equipped with an ISL 280 hp engine that employs
Selective Catalytic Reduction (SCR) technology.
Selective
Catalytic Reduction (SCR) consists of a Diesel Exhaust Fluid
(DEF) dosing system, a decomposition reactor, an SCR
catalyst and electronic controls. As exhaust passes from
the Cummins Particulate Filter into the SCR system, it is
sprayed with a fine mist of DEF. This fluid works to
transform NOx into harmless nitrogen gas and water vapor.
There is a DEF tank and a dash lamp to indicate when the DEF
fluid gets low provided by the OEM. The system is designed
to work via the ECM with no driver interaction (other than
monitoring the DEF fluid levels, much the same as monitoring
fuel levels). The Electronic Control Module (ECM) will
monitor the emissions output and signal for injection of the
DEF fluid whenever necessary to keep the Nox levels at the
appropriate levels.
Although
Cummins operates this system in longer range applications,
stop and go transit data TARC can provide is needed.
Cummins estimates a December 2009 data gathering completion.
TARC Web
Site
