During the year 1958, Doosan Infracore started to produce diesel engines and has continued R&D to help stay ahead of the curve in Korea's heavy and material handling industry. Doosan started in the year 1975, producing diesel engines on a mass scale at its very first large scale facility. Within ten years the company's production technology had advanced to the point that making its very own diesel engine model was possible. Doosan's leadership position in the industry was secured. In the year 1995 the company made its very first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Ever 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 low-emission, heavy-duty diesel engine model during 2007.
Doosan has many facilities around the world which help produce 60 different types of engines, as well as parts and materials. Products comprise natural gas engines and diesel engines for forklifts, trucks, construction equipment, buses, ships, generators and many more. Engines vary 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 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 within the United States during the year 2008, and a joint project factory within Xuzhou, China. The factory within China could manufacture 50,000 diesel engines on an annual basis, with production scheduled to begin in the year 2011.