Ever since Doosan Infracore began making diesel engines in 1958, the corporation has continued to build its R&D capacities to stay at the forefront of the industry within Korea. In the year 1975, Doosan started mass producing diesel engines at its very first large-scale plant. Within ten years the production technology of the business had progressed to the point that making its very own diesel engine model was possible. Doosan's leadership position within the business was secured. During the year 1995 Doosan produced its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. 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 heavy-duty, low emission diesel engine model in 2007.
Doosan has lots of facilities around the world which help produce 60 different engine models, as well as materials and parts. Products consist of diesel engines and natural gas engines for forklifts, trucks, buses, construction equipment, generators, ships and more. Engines range from 70 to 1,500 hp. Yearly output is currently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities which focus on increasing output and expanding into more markets. Demand for more stringent policies governing engine emissions has led the company to build a compressed natural gas engine plant in the US during the year 2008, and a joint venture factory within Xuzhou, China. The factory within China will have the capacity to make 50,000 diesel engines every year, with production scheduled to start in 2011.