Since Doosan Infracore began making diesel engines during 1958, the business has continued to manufacture its R&D capacities to stay at the forefront of the industry in Korea. In the year 1975, Doosan began mass producing diesel engines at its first large-scale plant. Within a decade the company's production technology had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position within the industry was secured. In 1995 Doosan produced 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 low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant engines. To be able comply with stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan Infracore has facilities worldwide to manufacture 60 different engine models, as well as parts and materials. Products comprise diesel engines and natural gas engines for forklifts, trucks, construction equipment, buses, ships, generators and more. Engines vary from 70 to 1,500 hp. Annual output is currently 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 more stringent regulations governing engine emissions has led the company to build a compressed natural gas engine factory within the US in 2008, and a joint project plant in Xuzhou, China. The factory in China could produce 50,000 diesel engines per year, with production scheduled to start in 2011.