Fluid cooling system of a combustion engine charged by a turbocharger and method for cooling a turbine housing of a turbocharger

Abstract

A fluid cooling system of a combustion engine charged by a turbocharger includes, but is not limited to a first cooling circuit operable by a coolant pump which runs through an engine block cooling jacket and a second cooling circuit branched off from the first cooling circuit, which runs through a cooling jacket formed between an inner wall and an outer wall of a double-walled turbine housing of the turbocharger.

1 . A fluid cooling system of a combustion engine charged by a turbocharger comprising:
 a first cooling circuit operable by a coolant pump, the first cooling circuit running through an engine block cooling jacket; and   a second cooling circuit branched off from the first cooling circuit, the second cooling circuit running through a cooling jacket formed between an inner wall and an outer wall of a double-walled turbine housing of the turbocharger.   
     
     
         2 . The fluid cooling system according to  claim 1 , wherein the second cooling circuit comprises a branch-off to a turbine bearing housing of the turbocharger. 
     
     
         3 . The fluid cooling system according to  claim 2 , wherein in the second cooling circuit comprises a temperature sensor. 
     
     
         4 . The fluid cooling system according to  claim 3 , wherein the temperature sensor is downstream of the cooling jacket of the turbine bearing housing. 
     
     
         5 . The fluid cooling system according to  claim 2 , wherein in the second cooling circuit comprises a switching valve activatable by an engine control. 
     
     
         6 . The fluid cooling system according to  claim 5 , wherein the engine control is adapted to receive:
 a temperature signal from a temperature sensor;   a second temperature signal from a second temperature sensor that is arranged in the first cooling circuit downstream of the engine block cooling jacket;   an engine rotational speed; and   a current engine rotational moment.   
     
     
         7 . The fluid cooling system according to  claim 5 , wherein a switching valve is arranged between the branch-off to the turbine bearing housing and the cooling jacket. 
     
     
         8 . The fluid cooling system according to  claim 1 , wherein the first cooling circuit comprises a switchable coolant pump. 
     
     
         9 . A fluid cooling system according to  claim 1 , wherein the double-walled turbine housing is formed of sheet metal. 
     
     
         10 . A method for cooling a turbine housing of a turbocharger, comprising:
 flowing a coolant through a cooling jacket of the turbine housing; and   controlling the flowing of the coolant with a switching valve activatable by an engine control.   
     
     
         11 . The method according to  claim 10 , further comprising:
 determining an engine rotational speed;   determining an engine moment;   measuring a first temperature downstream of the cooling jacket of the turbine housing;   measuring a second temperature downstream of an engine block cooling jacket; and   transmitting the engine rotational speed, the engine moment, the first temperature, and the second temperature to the engine control.   
     
     
         12 . The method according to  claim 11 , further comprising calculating a differential temperature as a difference between the second temperature and the first temperature. 
     
     
         13 . The method according to  claim 12 , wherein the controlling the coolant flowing through the engine block cooling jacket with a switchable coolant pump activatable by the engine control. 
     
     
         14 . The method according to  claim 11 , wherein the controlling the coolant flowing through the engine block cooling jacket is carried out as a function of the first temperature. 
     
     
         15 . The method according to  claim 11 , wherein the controlling the coolant flowing through the engine block cooling jacket is carried out as a function of the second temperature.