Engine cooling device

Abstract

An engine cooling device includes: a water pump pressure-feeding a common coolant to plural coolant circulation paths; an engine including an engine main body; a water-cooled header cooling an exhaust system of the engine by use of the coolant, a heat capacity of the water-cooled header being smaller than that of the engine main body; an ECU and a thermostat determining whether or not the coolant is allowed to flow through the fifth and sixth coolant circulation paths among the plural coolant circulation paths on the basis of a given determination value. The given determination value relates to an amount of heat transferred from the exhaust gas to the water-cooled header.

1 . An engine cooling device comprising:
 a cooling medium pressure-feeding portion feeding a common cooling medium to plural cooling medium circulation paths;   an engine including an engine main body incorporated into at least one of the plural cooling medium circulation paths;   an exhaust system cooling portion incorporated into at least one of the plural cooling medium circulation paths, and cooling an exhaust system of the engine by use of the coolant, a heat capacity of an exhaust system cooling device being smaller than that of the engine main body;   a cooler incorporated into at least one of the plural cooling medium circulation paths, and cooling the coolant;   a flow control device determining whether or not the cooling medium flows through the at least one of the plural cooling medium circulation paths into which the cooler is incorporated on the basis of a given determination value, and controlling a flow of the cooling medium,   wherein the given determination value relates to an amount of heat transferred from the exhaust gas to the cooling medium in the exhaust system cooling portion.   
     
     
         2 . The engine cooling device of  claim 1 , further comprising a flow rate adjusting portion incorporated into at least one of the cooling medium circulation paths into which the exhaust system cooling portion is incorporated, among the plural cooling medium circulation paths, and adjusting a flow rate of the cooling medium discharged from the exhaust system cooling portion such that a pressure force of the cooling medium flowing through the exhaust system cooling portion is greater than a system pressure force of the cooling medium flowing through each of the plural cooling medium circulation paths.