In 1958, Doosan Infracore began to make diesel engines and has continued R&D to help stay ahead of the curve within Korea's heavy and material handling industry. Doosan started during the year 1975, producing diesel engines on a mass scale at its very first large scale facility. Within a decade the company's production technology had advanced 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 very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. In order to comply with stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in the year 2007.
Doosan Infracore has facilities worldwide to manufacture 60 different kinds of engines, as well as materials and parts. Products include diesel engines and natural gas engines for forklifts, trucks, buses, construction machinery, generators, ships and many more. Engines range from 70 to 1,500 hp. Annual output is now 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 stricter regulations governing engine emissions has led the company to make a compressed natural gas engine plant in the United States during 2008, and a joint venture factory within Xuzhou, China. The plant in China could manufacture 50,000 diesel engines on an annual basis, with production scheduled to start in 2011.