In the year 1958, Doosan Infracore started 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 began during 1975, manufacturing diesel engines on a mass scale at its very first large scale facility. Within ten years the production technology of the company had progressed to the point that production of its very own diesel engine model was possible. Doosan's leadership position within the industry was secured. During 1995 Doosan made its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. 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 low-emission, heavy-duty diesel engine model in the year 2007.
Doosan has lots of facilities throughout the world that help make 60 different engine models, as well as materials and parts. Products consist of diesel engines and natural gas engines for forklifts, trucks, buses, construction machines, generators, ships and many more. Engines vary from 70 to 1,500 hp. Annual output is currently 75,000 units.
The company is continually engaged in expanding R&D capabilities to expand to more markets and increase output. Demand for more stringent policies 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 in China could produce 50,000 diesel engines on a yearly basis, with production scheduled to begin in 2011.