Since Doosan Infracore started making diesel engines during the year 1958, the corporation has continued to manufacture its R&D capacities to stay at the forefront of the industry in Korea. During 1975, Doosan started mass producing diesel engines at its very first large-scale plant. In a decade the company's production technology had progressed to the point that producing its own diesel engine model was possible. Doosan's leadership position in the industry was secured. During the year 1995 the company produced its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Ever 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 low-emission, heavy-duty diesel engine model during 2007.
Doosan has a lot of facilities around the globe which help manufacture 60 different engine models, as well as parts and materials. Products include diesel engines and natural gas engines for trucks, forklifts, buses, construction equipment, generators, ships and 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 that 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 in 2008, and a joint project plant in Xuzhou, China. The plant within China can produce 50,000 diesel engines per year, with production scheduled to begin in 2011.