Patent ID: 7131403
Filing Date: 2006-11-07
Classification: F01P,F02B,Y02T

Abstract:
1. In a locomotive having an engine, an intercooler, and an oil cooler, each having respective cooling passages formed therein, and a cooling system in selective communication with the respective cooling passages for selectively providing a first coolant and a second coolant at a higher temperature than the first coolant to the cooling passages, a method of operating the cooling system comprising: providing, in a first mode, a first coolant flow to the intercooler and a second coolant flow to the oil cooler at a first temperature different than the first coolant flow to achieve preferential cooling of the intercooler effective to optimize an emission level produced by the engine while maintaining a desired horsepower output produced by the engine; and providing, in a second mode, the first coolant flow to the intercooler and the second coolant flow to the oil cooler at a second temperature different than the first coolant flow to achieve preferential cooling of the oil cooler effective to optimize a horsepower output produced by the engine.