Navistar: Research Shows Advanced EGR Offers 4.5 Percent Advantage in 'Fluid ...
Results released from third-party testing conducted by the Transportation Research Center, Inc., (TRC) and commissioned by Navistar indicate that diesel-powered IC Bus CE Series school buses using Advanced EGR technology could offer up to a 4.5 percent advantage in fluid economy over competing bus brands that rely on SCR to meet stringent 2010 EPA emissions standards to reduce NOx.
Navistar said fluid economy, or the measurement of diesel fuel plus liquid urea used by a vehicle's emissions reduction system, is the proper way to compare today's new school buses that utilize different technologies to meet EPA 2010 emissions requirements. Essentially, according to Navistar, fuel economy only tells part of the story because SCR buses that use liquid urea could increase operating costs above and beyond what fleets are already paying for diesel fuel. And SCR with urea can introduce additional requirements on operators with regard to storing the liquid at their facilities.
IC Bus published online a five-page white paper on the testing.
In addition to the up to 4.5 percent advantage in fluid economy in typical school bus conditions in the best case scenario, TRC determined that the MaxxForce 7 engine could offer a fluid-economy advantage of between 0.5 and 1.5 percent by using TMC Type IV testing methods, which are considered to most closely replicate real-world fuel economy because they factor in vehicle aerodynamics, powertrain and tires.
The independent, third-party research conducted in May at TRC's proving-ground facility in East Liberty, Ohio, compared an IC Bus CE Series powered by an EPA-compliant 2010 MaxxForce7 with Advanced EGR with a Blue Bird Vision and a Thomas Built Buses Saf-T-Liner C2, both of which are equipped with Cummins ISB engines. The difference between the two technologies is that EGR continually re-circulates gas exhaust into the engine’s combustion chamber until NOx is essentially burned up, and SCR uses liquid urea to treat the exhaust gas stream outside of the engine to reduce NOx to EPA-accepted levels of 0.02 grams.
In the latest round of test for IC Bus, Navistar said the three school bus brands were in similar mechanical condition, were loaded with equal ballast weights and side window openings were the same in each vehicle at all times. Each bus was tested on multiple runs of a 135-mile test route that was developed specifically to replicate typical school bus applications. The tests gauged idle time, frequent stop-and-go intervals and long routes at low average speeds ranging from zero to 50 miles per hour. Drivers also switched vehicles every 45 miles of the test route to eliminate driver influence on the test results.
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