Since Doosan Infracore started producing diesel engines in 1958, the corporation has continued to build its R&D capacities to stay at the forefront of the industry within Korea. During 1975, Doosan started mass producing diesel engines at its first large-scale plant. In a decade the production technology of the business had advanced to the point that making its own diesel engine model was possible. Doosan's leadership position in the business was secured. During 1995 the company made its very first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. 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. To be able comply with stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in the year 2007.
Doosan has many facilities around the world which help produce 60 different types of engines, as well as materials and parts. Products comprise natural gas engines and diesel engines for forklifts, trucks, buses, construction machinery, generators, ships and many more. Engines vary from 70 to 1,500 horse power. Yearly output is presently 75,000 units.
The company is continually engaged in expanding R&D capabilities to increase output and expand to more markets. Demand for stricter policies governing engine emissions has led the company to make a compressed natural gas engine plant in the US in 2008, and a joint venture plant within Xuzhou, China. The plant in China can manufacture 50,000 diesel engines on a yearly basis, with production scheduled to begin in the year 2011.