In 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 began during 1975, manufacturing diesel engines on a mass scale at its first large scale facility. Within a decade 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 business was secured. During 1995 Doosan made its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Since 2000, the company has developed technology for low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant engines. To be able follow strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model during 2007.
Doosan has lots of facilities throughout the world which help manufacture 60 different engine models, as well as parts and materials. Products consist of natural gas engines and diesel engines for forklifts, trucks, construction machines, buses, generators, ships and more. Engines range from 70 to 1,500 horse power. Annual output is now 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 US during 2008, and a joint project factory within Xuzhou, China. The plant within China could make 50,000 diesel engines per year, with production scheduled to begin in the year 2011.