During 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 started in 1975, manufacturing diesel engines on a mass scale at its first large scale facility. Within 10 years the company's production technology had progressed to the point that production of its own diesel engine model was possible. Doosan's leadership position in the business was secured. In the year 1995 the company produced its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Since the year 2000, the company has developed technology for sophisticated common-rail engines, Tier 3-compliant engines and low-pressure natural gas engines. In order to comply with stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan has numerous facilities throughout the globe which help produce 60 different engine models, as well as materials and parts. Products consist of natural gas engines and diesel engines for forklifts, trucks, buses, construction machinery, ships, generators 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 increasing output and expanding into more markets. Demand for stricter policies governing engine emissions has led the company to build a compressed natural gas engine factory in the United States during the year 2008, and a joint venture factory in Xuzhou, China. The plant within China would have the capacity to make 50,000 diesel engines each year, with production scheduled to start in the year 2011.