In the year 1958, Doosan Infracore began to make diesel engines and has continued R&D to help stay ahead of the curve in Korea's heavy and material handling industry. Doosan started during the year 1975, producing diesel engines on a mass scale at its first large scale facility. Within a decade the production technology of the company had progressed to the point that production of its own diesel engine model was possible. Doosan's leadership position in the industry was secured. During the year 1995 Doosan produced its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since 2000, the company has developed technology for sophisticated common-rail engines, Tier 3-compliant engines and low-pressure natural gas engines. In order to follow strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model in the year 2007.
Doosan has lots of facilities around the world which help make 60 different types of engines, as well as parts and materials. Products comprise diesel engines and natural gas engines for forklifts, trucks, buses, construction equipment, generators, ships and more. Engines range from 70 to 1,500 hp. Annual output is currently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities that focus on increasing output and expanding into more markets. Demand for more stringent regulations governing engine emissions has led the company to build a compressed natural gas engine plant within the US during the year 2008, and a joint project plant in Xuzhou, China. The plant in China would have the capacity to produce 50,000 diesel engines each year, with production scheduled to begin in the year 2011.