During the year 1958, Doosan Infracore started to produce 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, manufacturing diesel engines on a mass scale at its first large scale facility. In a decade the production technology of the business had advanced to the point that making its very own diesel engine model was possible. Doosan's leadership position in the industry was secured. In the year 1995 the company produced its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever since 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. To be able comply with strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model during 2007.
Doosan has many facilities around the globe which help manufacture 60 different engine models, as well as materials and parts. Products consist of natural gas engines and diesel engines for trucks, forklifts, construction equipment, buses, generators, ships and many more. Engines vary from 70 to 1,500 hp. Yearly output is presently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities that focus on expanding into more markets and increasing output. Demand for more stringent policies governing engine emissions has led the company to build a compressed natural gas engine plant in the United States in 2008, and a joint project factory in Xuzhou, China. The factory within China could make 50,000 diesel engines on an annual basis, with production scheduled to start in the year 2011.