Ever since Doosan Infracore began producing diesel engines in the year 1958, the business has continued to manufacture its R&D capacities to stay at the forefront of the business in Korea. In 1975, Doosan started mass producing diesel engines at its first large-scale plant. Within 10 years the production technology of the business had progressed to the point that producing its very own diesel engine model was possible. Doosan's leadership position within the industry was secured. During the year 1995 the company produced its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Ever 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 follow strict Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model in 2007.
Doosan has numerous facilities throughout the world which help manufacture 60 different engine models, as well as materials and parts. Products include diesel engines and natural gas engines for trucks, forklifts, buses, construction equipment, ships, generators and more. Engines range from 70 to 1,500 hp. Yearly output is presently 75,000 units.
Doosan still puts great emphasis on its R&D capabilities that focus on expanding into more markets and increasing output. Demand for more stringent policies governing engine emissions has led the company to build a compressed natural gas engine plant in the United States in the year 2008, and a joint project plant within Xuzhou, China. The factory within China could manufacture 50,000 diesel engines per year, with production scheduled to start in the year 2011.