Cleveland RTA Swapping Out More CNG for Clean Diesel Buses
13 September 2005
The Greater Cleveland Regional Transit Authority (RTA) is ordering more new clean diesel buses with Caterpillar engines to replace older CNG fueled buses.
The RTA has exercised options to purchase 92 additional clean diesel buses manufactured by North American Bus Industries, Inc. (NABI). The new buses will feature Caterpillar C9 engines with ACERT technology.
ACERT is Caterpillar’s efficient combustion process that the company uses as its solution to reduce emissions while retaining power and performance under a variety of conditions. The engine management system identifies the optimum settings for the lowest possible NOx emissions and optimized fuel economy.
Exhaust gas turbochargers, in series on heavy-duty engines, coupled with a hydraulic-assist valve control provide a flexible air management system. The system recovers exhaust energy, which improves fuel economy, and lowers in-cylinder combustion temperatures to improve emissions.
The C9 engine with ACERT for urban transit uses a diesel particulate filters (DPF) and requires the use of ultra low-sulfur diesel (ULSD) fuel to conform to EPA 2004 standards.
Cleveland RTA was the 25th largest in the country in 2004, with a total fleet size of 783. It began the clean diesel purchase process in 2001, with an initial order of 220.
RTA was one of the first major transit systems in the country to order compressed natural gas (CNG)-fueled buses in 1991, but turned to the clean diesel option out of concern over costs.
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