integrated engine control and cooling system for diesel engines

摘要

Integrated engine control and cooling system for diesel engines. A locomotive includes an engine (12), an intercooler (16) and an oil heat exchanger (28), each with respective cooling passages formed therein. The locomotive also includes a refrigeration system (10) in selective communication with the respective refrigeration passages in order to selectively supply a first refrigerant (56) and a second refrigerant (52), at a higher temperature than the first refrigerant, for the cooling passages. A method for operating the refrigeration system includes providing, in a first mode, a first flow of refrigerant (26) for the intercooler and a second flow of refrigerant (30) for the oil heat exchanger at a first temperature, different from the temperature of the first refrigerant flow, The method also includes providing, in a second mode, the first refrigerant flow to the intercooler and the second refrigerant flow to the oil heat exchanger at a second temperature, different from the temperature of the first flow of refrigerant, in order to obtain the preferred cooling of the oil heat exchanger.