This paper describes a patented cooling system concept for a turbocharged diesel engine. In particular, it defines a cooling system having the capability of transferring some of the cooling capacity of engine jacket and engine oil cooling to cool the cylinder inlet air when more than the cooling capacity built into the system through the size of the radiators and fans is needed. This increased aftercooling will improve the engine performance and reduce emission levels. The cooling capacity of a locomotive is essentially determined by the radiator and fan size, among other factors, and is designed to cool the engine within acceptable metal temperatures at a specified maximum ambient temperature and at the maximum engine power. On the other hand, at lower ambient temperatures or engine power levels, the cooling needs of the engine will be less than this maximum cooling capacity of the cooling system. There remains some excess capacity. This paper describes the concept called the “Separate Aftercooling System” that uses some of this excess cooling capacity to cool the engine inlet air at the aftercoolers. It shows the feasibility of such a system, describes the order of magnitude of benefits that can be expected from such a system, and outlines the implementation of this concept to EMD built Locomotives.

Engine Maintenance Manual, 1994, Model 710G3B Engine, Document No. EE000003, General Motors Corporation, Electro-Motive Division, LaGrange, IL 60525.
Locomotive Service Manual, 1995, SD70MAC Locomotive, Document # S0936445, 1st Edition, General Motors Corporation, Electro-Motive Division, LaGrange, IL 60525, USA.
Heywood, J. R., 1988, Internal Combustion Engine Fundamentals, McGraw-Hill, New York.
Uzkan, T., 1997, Turbocharged Engine Cooling Apparatus, U.S. Patent #5598705 (other patent applications pending).
Stang, J. H. and Yamaguchi, H., 1982, Two Loop Engine Cooling System, U.S. Patent #4,325,219.
Melchior, J. F., 1984, Supercharged Internal Combustion Engine Equipped With an Air Intercooling System, U.S. Patent #4,485,624.
Musick, D. R., and Howell, E. H., 1985, Self-Adjusting Cooling System for Diesel Engines, U.S. Patent #4,517,929.
Roettgen, L. A., et al., 1985, Low Flow Cooling System and Apparatus, U.S. Patent #4,520,767.
Crofts, J. G., 1985, Cooling System, U.S. Patent #4,550,692.
Nagle, J. A., et al., 1995, Split Temperature Regulating System and Method for Turbocharged Internal Combustion Engine, U.S. Patent #5,415,147.
McTaggart, L. E., 1993, Controlled Cooling System For A Turbocharged Internal Combustion Engine, U.S. Patent #5,201,285.
Uzkan, T., 1995, Locomotive Engine Cooling System, U.S. Patent #5,392,741.
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