Since Doosan Infracore started making diesel engines during the year 1958, the company has continued to manufacture its R&D capacities to stay at the forefront of the industry in Korea. In the year 1975, Doosan started mass producing diesel engines at its very first large-scale plant. In a decade the production technology of the company had advanced to the point that making its very own diesel engine model was possible. Doosan's leadership position in the industry was secured. During 1995 Doosan made its 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 comply with stringent Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model in 2007.
Doosan has numerous facilities around the globe which help manufacture 60 different types of engines, as well as parts and materials. Products comprise natural gas engines and diesel engines for trucks, forklifts, buses, construction machinery, generators, ships and many more. Engines range from 70 to 1,500 hp. Annual output is presently 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 policies governing engine emissions has led the company to build a compressed natural gas engine plant in the United States in the year 2008, and a joint project factory within Xuzhou, China. The factory in China can manufacture 50,000 diesel engines on a yearly basis, with production scheduled to start in 2011.