Control method of cooling system having coolant control valve unit

Abstract

A cooling system has a coolant control valve unit receiving a coolant exhausted from a cylinder head. A control method of the cooling system is configured to control opening rates of a first coolant passage through which the coolant is distributed to a heater core, a second coolant passage through which the coolant is distributed to a radiator, and a third coolant passage through which the coolant is exhausted from a cylinder block, and further includes sensing a driving condition, and controlling an operation of the coolant control valve depending on the sensed driving condition.

What is claimed is: 
     
         1 . A control method of a cooling system, comprising:
 providing a coolant control valve unit of the cooling system that receives a coolant exhausted from a cylinder head and is configured to control opening rates of a first coolant passage through which the coolant is distributed to a heater core, a second coolant passage through which the coolant is distributed to a radiator, and a third coolant passage through which the coolant is exhausted from a cylinder block;   sensing a driving condition by a controller; and   controlling, by the controller, an operation of the coolant control valve depending on the sensed driving condition.   
     
     
         2 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a first mode blocking the first and second coolant passages and blocking the third coolant passage.   
     
     
         3 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a second mode variably controlling an opening rate of the first coolant passage and blocking the second and third coolant passages.   
     
     
         4 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a third mode maximizing the opening rate of the first coolant passage, variably controlling the opening rate of the second coolant passage, and blocking the third coolant passage.   
     
     
         5 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a fourth mode maximizing the opening rate of the first coolant passage, maximizing the opening rate of the second coolant passage, and variably controlling the opening rate of the third coolant passage.   
     
     
         6 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a fifth mode maximizing the opening rate of the first coolant passage, maximizing the opening rate of the second coolant passage, and maximizing the opening rate of the third coolant passage.   
     
     
         7 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a sixth mode maximizing the opening rate of the first coolant passage, variably controlling the opening rate of the second coolant passage, and maximizing the opening rate of the third coolant passage.   
     
     
         8 . The control method of  claim 1 , wherein:
 the controlling of the operation of the coolant control valve includes a seventh mode maximizing the opening rate of the first coolant passage, blocking the second coolant passage, and maximizing the opening rate of the third coolant passage.