Ever since Doosan Infracore began making diesel engines during 1958, the company has continued to manufacture its R&D capacities to stay at the forefront of the industry within Korea. During 1975, Doosan began mass producing diesel engines at its first large-scale plant. Within a decade the production technology of the company had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position in the business was secured. In 1995 Doosan produced its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. 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 follow strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model during 2007.
Doosan has a lot of facilities around the globe which help produce 60 different types of engines, as well as materials and parts. Products include natural gas engines and diesel engines for trucks, forklifts, buses, construction machinery, generators, ships and 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 expanding into more markets and increasing output. 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 project factory in Xuzhou, China. The factory within China could make 50,000 diesel engines on a yearly basis, with production scheduled to begin in the year 2011.