Cooling system in a vehicle

Abstract

A cooling system with a circulating coolant for cooling a combustion engine in a vehicle ( 1 ) includes a first radiator ( 13 ), a first line circuit ( 14, 15, 16 ) which leads coolant from the first radiator ( 13 ) to the engine ( 2 ); a second line circuit ( 17, 18 ) which leads coolant from the engine ( 2 ) to the first radiator ( 13 ); a second radiator ( 20 ) upstream of the first radiator ( 13 ) in air flow through radiators; a third line circuit ( 21, 22, 24 ) including at least one line ( 21, 24 ) to lead coolant from a line ( 16 ) in the first line circuit to the second radiator ( 20 ), and a fourth line circuit ( 25, 26 a - d, 27 ) which leads coolant from the second radiator ( 20 ) to the first line circuit ( 15 ) and which contains at least one cooler ( 29, 30, 31 ) for cooling a medium or component of the vehicle ( 1 ).

1 . A cooling system with a circulating coolant for cooling a combustion engine in a vehicle, the system comprises:
 a first radiator in which the coolant is cooled by an air flow in a direction through the first radiator;   a first line circuit which leads coolant from the first radiator to the engine, a second line circuit which leads coolant from the engine to the first radiator;   a second radiator at a location upstream of the first radiator with respect to the direction of the air flow so that at least part of the air flow through the second radiator flows also through the first radiator;   a third line circuit which comprises at least a first coolant line which leads coolant from a line in the first line circuit to the second radiator;   the third line circuit comprises at least a second coolant line which leads coolant from a line in the second line circuit to the second radiator;   the third line circuit includes a valve device operable to a first position for leading coolant from the line in the first line circuit to the second radiator, and operable to a second position for leading coolant from the line in the second line circuit to the second radiator; and   a fourth line circuit which leads coolant from the second radiator to the first line circuit and the fourth line circuit contains at least one cooler for cooling a medium or component of the vehicle.   
     
     
         2 . A cooling system according to  claim 1 , wherein the fourth line circuit comprises at least two parallel lines each including a cooler configured and located for cooling a respective medium or component of the vehicle. 
     
     
         3 . A cooling system according to  claim 1 , further comprising:
 a sensor configured for monitoring a parameter related to the coolant temperature in the cooling system; and   a control unit configured for receiving information from the sensor for controlling an aspect of the system based on the information.   
     
     
         4 . A cooling system according to  claim 3 , wherein the aspect of the system is the valve device and the control unit is configured for putting the valve device into the second position when the control unit receives information from the sensor that the coolant is at a higher temperature than a reference value. 
     
     
         5 . A cooling system according to  claim 1 , further comprising a cooler for cooling a medium or component in the second line circuit. 
     
     
         6 . A cooling system according to  claim 1 , wherein the second radiator is at a location in the vehicle and the location is, with respect to the direction of the air flow through the radiator, upstream of a cooler for cooling a gaseous medium, wherein the medium contains water vapour, so that at least part of the air which flows through the second radiator flows also through said coolers. 
     
     
         7 . A cooling system according to  claim 6 , further comprising:
 a sensor which monitors a parameter related to whether there is ice formation or risk of ice formation in the coolers; and   a control unit configured for receiving information from the sensor, and for putting the valve device into the second position when the control unit receives information from the sensor that there is ice formation or risk of ice formation in the coolers.   
     
     
         8 . A cooling system according to  claim 2 , wherein the fourth line circuit comprises a bypass line and a second valve by which the coolant is led through the bypass line and thus past the lines with the coolers.