In the year 1958, Doosan Infracore started 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 began during 1975, manufacturing diesel engines on a mass scale at its first large scale facility. In a decade the production technology of the business had progressed to the point that production of its very own diesel engine model was possible. Doosan's leadership position in the business was secured. In 1995 Doosan produced its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since the year 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. In order to follow stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model during the year 2007.
Doosan has many facilities around the world which help manufacture 60 different engine models, as well as materials and parts. Products include natural gas engines and diesel engines for trucks, forklifts, buses, construction equipment, generators, ships and many more. Engines range from 70 to 1,500 hp. Yearly output is now 75,000 units.
Doosan still puts great emphasis on its R&D capabilities which 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 factory in the United States in 2008, and a joint project factory within Xuzhou, China. The plant in China will have the capacity to produce 50,000 diesel engines per year, with production scheduled to begin in the year 2011.