During 1958, Doosan Infracore began to make diesel engines and has continued R&D to help stay ahead of the curve within Korea's heavy and material handling industry. Doosan started during 1975, producing diesel engines on a mass scale at its very first large scale facility. Within a decade the company's production technology had progressed to the point that producing its very own diesel engine model was possible. Doosan's leadership position within the business was secured. In 1995 the company made its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever since 2000, the company has developed technology for sophisticated common-rail engines, Tier 3-compliant engines and low-pressure natural gas engines. To be able follow strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model during the year 2007.
Doosan Infracore has facilities worldwide to manufacture 60 different engine models, as well as materials and parts. Products consist of diesel engines and natural gas engines for forklifts, trucks, construction machines, buses, generators, ships and more. Engines vary from 70 to 1,500 hp. Annual output is now 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 regulations 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 venture plant within Xuzhou, China. The factory in China can make 50,000 diesel engines on an annual basis, with production scheduled to start in 2011.