Engine cooling system

Abstract

An engine cooling system decreases vehicle weight caused by employing a Rankine cycle, makes it possible to improve the performance of the Rankine cycle, and includes a coolant that circulates through a cooling pump, an evaporator, an expander, and in a condenser in this order; an engine main body in which a turbocharger is arranged in an intake passage; and a radiator through which cooling water for the engine main body circulates. A sub-radiator is installed parallel to the radiator; air that is compressed by the turbocharger is used as a heating source for the evaporator; and outlet-side cooling water of the sub-radiator is used as a cooling source for the condenser.

1 . An engine cooling system comprising:
 a Rankine cycle configured such that a coolant circulates through a cooling pump, an evaporator, an expander, and a condenser in this order;   an engine main body in which a supercharger is arranged in an intake passage;   a radiator through which cooling water for the engine main body circulates; and   a sub-radiator installed parallel to the radiator,   wherein air compressed by the supercharger is used as a heating source for the evaporator, and   wherein outlet-side cooling water of the sub-radiator is used as a cooling source for the condenser.   
     
     
         2 . The engine cooling system according to  claim 1 , wherein some of outlet-side cooling water of the radiator merges with the cooling water having passed through the condenser and returning to the sub-radiator. 
     
     
         3 . The engine cooling system according to  claim 1 , wherein the expander is linked to an electric power generator. 
     
     
         4 . The engine cooling system according to  claim 2 , wherein the expander is linked to an electric power generator.