Since Doosan Infracore began producing diesel engines in the year 1958, the company has continued to build its R&D capacities to stay at the forefront of the industry within Korea. In 1975, Doosan began mass producing diesel engines at its very first large-scale plant. In 10 years the company's production technology had progressed to the point that producing its very own diesel engine model was possible. Doosan's leadership position within the business was secured. In the year 1995 the company made its first low-emission diesel engine, followed by commercial vehicle CNG engines three years later. Since the year 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. In order to follow stringent Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in the year 2007.
Doosan has many facilities throughout the globe that help make 60 different engine models, as well as parts and materials. Products consist of diesel engines and natural gas engines for forklifts, trucks, buses, construction equipment, ships, generators and many more. Engines vary from 70 to 1,500 horse power. Yearly output is currently 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 factory in the United States during 2008, and a joint venture plant in Xuzhou, China. The plant in China can manufacture 50,000 diesel engines on an annual basis, with production scheduled to begin in 2011.