During the year 1958, Doosan Infracore began to make diesel engines and has continued R&D to help stay ahead of the curve in Korea's heavy and material handling industry. Doosan started in 1975, producing diesel engines on a mass scale at its very first large scale facility. In ten 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. During 1995 the company produced its very first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since 2000, the company has developed technology for Tier 3-compliant engines, low-pressure natural gas engines and sophisticated common-rail engines. To be able follow strict Euro emission control standards, the company developed a low-emission, heavy-duty diesel engine model during 2007.
Doosan has numerous facilities throughout the world which help make 60 different types of engines, as well as materials and parts. Products comprise natural gas engines and diesel engines for forklifts, trucks, buses, construction equipment, 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 stricter policies governing engine emissions has led the company to build a compressed natural gas engine plant in the US during the year 2008, and a joint project plant within Xuzhou, China. The plant within China can manufacture 50,000 diesel engines each year, with production scheduled to begin in the year 2011.