Ever since Doosan Infracore began making diesel engines in the year 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 a decade the company's production technology had progressed to the point that production of its very own diesel engine model was possible. Doosan's leadership position within the industry was secured. During 1995 Doosan made its very first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Since the year 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 low-emission, heavy-duty diesel engine model during 2007.
Doosan has numerous facilities around the world which help make 60 different types of engines, as well as parts and materials. Products include diesel engines and natural gas engines for forklifts, trucks, construction machinery, buses, generators, ships and more. Engines range from 70 to 1,500 hp. Yearly output is currently 75,000 units.
The company is continually engaged in expanding R&D capabilities to increase output and expand to more markets. Demand for more stringent regulations governing engine emissions has led the company to build a compressed natural gas engine factory within the United States in 2008, and a joint project factory in Xuzhou, China. The factory in China would have the capacity to manufacture 50,000 diesel engines every year, with production scheduled to begin in 2011.