During 1958, Doosan Infracore began 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 began in the year 1975, producing diesel engines on a mass scale at its very first large scale facility. In ten years the production technology of the company had progressed to the point that production of its own diesel engine model was possible. Doosan's leadership position in the business was secured. During the year 1995 the company produced 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 comply with stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan has a lot of facilities around the world which help manufacture 60 different types of engines, as well as parts and materials. Products consist of natural gas engines and diesel engines for trucks, forklifts, construction equipment, buses, ships, generators and many more. Engines range from 70 to 1,500 horse power. Yearly output is currently 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 factory within the US during 2008, and a joint project plant in Xuzhou, China. The plant in China can make 50,000 diesel engines every year, with production scheduled to start in the year 2011.