System And Method To Decrease Warmup Time Of Coolant And Engine Oil In Engine Equipped With Cooled EGR

摘要

A cooling system and method of using a cooling system for an engine equipped with an exhaust gas recirculation (EGR) system. A pump provides pressure for circulating liquid through the cooling system. The cooling system has two loops: an engine cooling loop and an EGR cooling loop. The engine cooling loop cools the engine in a conventional manner. The EGR cooling loop goes first to an EGR cooler and next to an oil cooler. The heat exchange at the EGR cooler results in warmed coolant being delivered to the oil cooler, where it warms engine oil. Warm-up time for engine oil is thereby decreased.

主权项

1. A cooling system for an engine equipped with an exhaust gas recirculation (EGR) system, comprising:
a pump for providing pressure for circulating liquid through the cooling system; an engine cooling loop from the pump, the engine cooling loop configured to deliver a portion of liquid from the pump to the engine and to return the liquid from the engine to the pump; an EGR cooling loop from the pump; an EGR cooler; an oil cooler; wherein the EGR cooling loop is configured to deliver a portion of liquid from the pump to the EGR cooler and to deliver the liquid from the EGR cooler to the oil cooler; wherein the EGR cooler is operable to cool recirculated exhaust and to warm the coolant by means of heat exchange; wherein the oil cooler is operable to warm engine lubrication oil by means of heat exchange with coolant from the EGR cooler; and wherein the EGR cooling loop is further configured to deliver coolant from the oil cooler to a return portion of the engine cooling loop.