Internal-combustion engines – Cooling – With cooling of additional parts or materials
Reexamination Certificate
2000-08-23
2001-11-13
Kamen, Noah P. (Department: 3747)
Internal-combustion engines
Cooling
With cooling of additional parts or materials
C123S563000, C123S041540
Reexamination Certificate
active
06314921
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to engine cooling systems, and more particularly to turbocharged engine cooling systems having aftercoolers.
BACKGROUND ART
The operation of heavy mechanical equipment such as large tractors generates considerable heat in the engines of the equipment, which must be efficiently dissipated to prevent damage to the engine. This is generally accomplished by coolant-based radiator systems, in which a pump circulates coolant through tubes in a radiator. Air cools the tubes and, hence, the coolant, and the coolant is then pumped through various engine components, e.g., an engine oil cooler, to cool these components.
As recognized herein, many engines of heavy equipment are turbocharged. Turbochargers generate pressurized charge air for the engine which is used in the combustion process. To reduce engine emissions, the temperature of the charge air from the turbocharger should be minimized, and aftercoolers have been provided for this purpose. Coolant from the radiator can be used to cool the turbocharged air passing through an aftercooler.
Thus, it is important to minimize coolant temperature at normal operating conditions, both to effectively cool engine components and to reduce emissions in turbocharged engines. As recognized herein, however, it is further important to provide appropriate coolant flow rates at light loads, i.e., when the engine generates relatively little heat. The present invention understands that both of these problems can be addressed in a manner that is superior to that provided by existing cooling systems.
DISCLOSURE OF THE INVENTION
A cooling system for an engine and an aftercooler that is associated with the engine includes a two-pass radiator, and an aftercooler configured for cooling engine charge air from a turbocharger. Moreover, the system includes a jacket water (JW) pump in fluid communication with the radiator. The JW pump pumps coolant from the radiator to the engine. A separate circuit aftercooling (SCAC) pump is in fluid communication with the radiator, and the SCAC pump pumps coolant from the radiator to the aftercooler.
In another aspect, an engine cooling system includes a radiator having one or more cores, a JW pump, and a shunt tank disposed above the JW pump in communication therewith to provide a static pressure head thereto. Also, the system includes an aftercooler and an SCAC pump. A coolant piping system connects the JW pump to the radiator and the SCAC pump to the aftercooler and radiator.
In still another aspect, a method for cooling an engine includes pumping coolant through a two-pass radiator to the engine, and returning the coolant to the radiator. The method further includes passing coolant from the radiator to an aftercooler to cool engine charge air from a turbocharger.
REFERENCES:
patent: 4520767 (1985-06-01), Roettgen et al.
patent: 5598705 (1997-02-01), Uzkan
patent: 5669338 (1997-09-01), Pribble et al.
patent: 6158398 (2000-12-01), Betz
patent: 6158399 (2000-12-01), Ash et al.
Ash Michael D.
Betz Michael D.
Dupree Ronald L.
Caterpillar Inc.
Huynh Hai
Kamen Noah P.
Rogitz & Associates
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