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Development of Conversion Technology of a Decrepit Diesel Vehicle to the Dedicated Natural Gas Vehicle  

Ryu, Kyung-Hyun (School of Mechanical Engineering, Kunsan National University)
Kim, Bong-Kyu (R&D Division, Korea Gas Corporation)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.14, no.6, 2006 , pp. 73-81 More about this Journal
Abstract
A commercial diesel engine was converted into a dedicated natural gas engine to reduce the exhaust emissions in a retrofit of a diesel-fueled vehicle. The cylinder head and piston were remodeled into engine parts suited for a spark ignition engine using natural gas. The remodeling of the combustion chamber changed the compression ratio from 21.5 to 10.5. A multi-point port injection(MPI) system for a dedicated natural gas engine was also adopted to increase the engine power and torque through improved volumetric efficiency, to allow a rapid engine response to changes in throttle position, and to control the precise equivalence ratio during cold-start and engine warm-up. The performance and exhaust emissions of the retrofitted natural gas engine after remodeling a diesel engine are investigated. The emissions of the retrofitted natural gas engine were low enough to satisfy the limits for a transitional low emission vehicle(TLEV) in Korea. We concluded that a diesel engine can be effectively converted into a dedicated natural gas engine without any deterioration in engine performance or exhaust emissions.
Keywords
Diesel engine; Natural gas engine; Retrofit; Smoke; NOx; Dedicated;
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