During 1958, Doosan Infracore began to make diesel engines and has continued R&D to help stay ahead of the curve in Korea's heavy and material handling industry. Doosan began during 1975, producing diesel engines on a mass scale at its very first large scale facility. In 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 industry was secured. During 1995 the company produced its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. In order to follow stringent Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model in 2007.
Doosan has numerous facilities around the world which help make 60 different engine models, as well as materials and parts. Products comprise natural gas engines and diesel engines for trucks, forklifts, construction machines, buses, ships, generators and more. Engines range from 70 to 1,500 hp. Annual 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 plant within the United States during the year 2008, and a joint venture factory within Xuzhou, China. The factory in China can make 50,000 diesel engines every year, with production scheduled to begin in the year 2011.