Full Throttle Toward Tier 4  

Oleh:

Korane, Kenneth J.

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 83 no. 14 (Aug. 2011), page 46-49.
Topik: Emission Standards; Cost Reduction; Energy Efficiency; Off Highway Vehicles; Diesel Engines; Compliance

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Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Emissions guidelines for diesel engines in off-highway equipment continue to get tougher. The introduction this January of EPA Tier 4 interim (Tier 4i) regulations in North America marks a significant tightening from Tier 3 limits which have been in place since 2006. According to officials from MTU Detroit Diesel, Detroit, the first step in complying with ever-tighter emissions regulations involves upgrading processes inside the engine -- for example, by increasing injection pressure, fine-tuning combustion, and using exhaust-gas recirculation to keep raw emissions as low as possible. This cuts overall engine size, eliminates the need for a second fluid, and lowers operating costs, according to Perkins Engines. MTU relies on selective catalytic reduction for its Tier 4i engines up to 750 hp. Tier 4i QSL9 engines reportedly have up to 5% better fuel efficiency compared to Tier 3 versions. Cummins says fuel efficiency will further increase for Tier 4f by an additional 2% to 3%.

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