Ever since Doosan Infracore started producing diesel engines in 1958, the company has continued to build its R&D capacities to stay at the forefront of the industry within Korea. During the year 1975, Doosan started mass producing diesel engines at its first large-scale plant. Within 10 years the production technology of the business had progressed to the point that producing its very own diesel engine model was possible. Doosan's leadership position in the business was secured. During 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 low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant 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 many facilities throughout the world that help make 60 different types of engines, as well as materials and parts. Products consist of diesel engines and natural gas engines for trucks, forklifts, construction equipment, buses, generators, ships and more. Engines vary from 70 to 1,500 horse power. Annual output is currently 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 factory in the United States in the year 2008, and a joint project plant within Xuzhou, China. The factory within China will have the capacity to manufacture 50,000 diesel engines on a yearly basis, with production scheduled to begin in 2011.