Since Doosan Infracore began making diesel engines during 1958, the business has continued to build its R&D capacities to stay at the forefront of the business in Korea. In 1975, Doosan started mass producing diesel engines at its very first large-scale plant. Within 10 years the production technology of the business had progressed to the point that producing its own diesel engine model was possible. Doosan's leadership position in the business was secured. During 1995 the company made its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. 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 follow stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan has many facilities around the globe that help make 60 different types of engines, as well as materials and parts. Products include natural gas engines and diesel engines for trucks, forklifts, buses, construction machines, ships, generators and more. Engines vary from 70 to 1,500 hp. 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 plant in the US during 2008, and a joint venture factory within Xuzhou, China. The plant in China could produce 50,000 diesel engines every year, with production scheduled to start in 2011.