Ever since Doosan Infracore began making diesel engines during 1958, the business has continued to build its R&D capacities to stay at the forefront of the business within Korea. In the year 1975, Doosan started mass producing diesel engines at its first large-scale plant. In a decade the company's production technology had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position within the business was secured. In the year 1995 the company made its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since 2000, the company has developed technology for low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant engines. In order to comply with stringent Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model during the year 2007.
Doosan has numerous facilities around the world which help produce 60 different engine models, as well as parts and materials. Products consist of natural gas engines and diesel engines for trucks, forklifts, buses, construction equipment, generators, ships and 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 which focus on expanding into more markets and increasing output. Demand for more stringent regulations governing engine emissions has led the company to make a compressed natural gas engine factory in the United States in the year 2008, and a joint project factory within Xuzhou, China. The factory within China will have the capacity to manufacture 50,000 diesel engines per year, with production scheduled to begin in the year 2011.