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 business in Korea. During the year 1975, Doosan began mass producing diesel engines at its first large-scale plant. Within a decade the production technology of the business had advanced to the point that production of its very own diesel engine model was possible. Doosan's leadership position in the business was secured. During the year 1995 Doosan made its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever 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 during 2007.
Doosan has many facilities around the world which help produce 60 different engine models, as well as parts and materials. Products include natural gas engines and diesel engines for trucks, forklifts, buses, construction equipment, generators, ships and many more. Engines vary from 70 to 1,500 horse power. Annual output is presently 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 more stringent regulations governing engine emissions has led the company to build a compressed natural gas engine factory in the US during 2008, and a joint venture factory in Xuzhou, China. The factory within China can manufacture 50,000 diesel engines every year, with production scheduled to begin in the year 2011.