Ever since Doosan Infracore began producing diesel engines during 1958, the corporation has continued to build its R&D capacities to stay at the forefront of the industry in Korea. In the year 1975, Doosan started mass producing diesel engines at its very first large-scale plant. Within ten years the company's production technology had advanced to the point that producing its very own diesel engine model was possible. Doosan's leadership position in the industry was secured. During 1995 Doosan produced 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. In order to comply with strict Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan Infracore has facilities worldwide to produce 60 different engine models, as well as materials and parts. Products comprise natural gas engines and diesel engines for trucks, forklifts, buses, construction machinery, ships, generators and many more. Engines range from 70 to 1,500 horse power. 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 regulations governing engine emissions has led the company to build a compressed natural gas engine factory in the United States during the year 2008, and a joint project factory within Xuzhou, China. The plant within China can make 50,000 diesel engines on an annual basis, with production scheduled to start in 2011.