Engine cooling system for vehicle and control method of the same

Abstract

An engine cooling system for a vehicle includes a water pump disposed to supply an engine with a coolant and a radiator disposed to cool heated coolant of the engine by exchanging heat with outside air. The system may include: a control valve that is disposed at one side of the engine to control flow rate and flow passage of coolant; a first passage that connects the control valve with the radiator and connects the radiator with the water pump; a TOC that is disposed between an outlet of the radiator and the water pump to be connected through the first passage; a second passage that connects the TOC with the control valve and directly supplies the TOC with the coolant exhausted from the engine; and a heater that is disposed in a third passage that bypasses the engine to connect the control valve with the water pump.

What is claimed is: 
     
         1 . An engine cooling system for a vehicle in which a water pump is disposed to supply an engine with a coolant and a radiator is disposed to cool heated coolant of the engine by exchanging heat with outside air, comprising:
 a control valve disposed at one side of the engine to control flow rate and flow passage of coolant;   a first passage that connects the control valve with the radiator and connects the radiator with the water pump;   a transmission oil cooler (TOC) disposed between an outlet of the radiator and the water pump to be connected through the first passage;   a second passage that connects the TOC with the control valve and direct supplies the TOC with the coolant exhausted from the engine; and   a heater disposed in a third passage that bypasses the engine to connect the control valve with the water pump.   
     
     
         2 . The engine cooling system for a vehicle of  claim 1 , wherein the control valve is a 3-way valve electrically controlled. 
     
     
         3 . The engine cooling system for a vehicle of  claim 1 , wherein an engine oil cooler (EOC) is disposed between the TOC and the water pump by connecting the first passage and the second passage. 
     
     
         4 . The engine cooling system for a vehicle of  claim 3 , wherein the EOC is disposed in parallel with the TOC. 
     
     
         5 . The engine cooling system for a vehicle of  claim 1 , wherein a bypass passage is formed between the radiator and the water pump, through which a part of the coolant exhausted from the radiator is bypassed and the bypassed coolant is supplied to the water pump. 
     
     
         6 . The engine cooling system for a vehicle of  claim 5 , an opening/closing valve is disposed on the bypass passage 
     
     
         7 . An engine cooling system for a vehicle in which a water pump that supplies an engine with a coolant is disposed at a coolant inlet side of an engine and a radiator is disposed to cool heated coolant of the engine by exchanging heat with outside air, comprising:
 a control valve disposed at a coolant outlet side of the engine;   a first passage that connects the control valve and the radiator and connects the radiator and the water pump;   a transmission oil cooler (TOC) disposed in a second passage connected to the control valve between the radiator and the water pump and is connected to the first passage;   an engine oil cooler (EOC) serially disposed with the TOC on the second passage; and   a heater disposed in a third passage that connects the control valve with the water pump.   
     
     
         8 . The engine cooling system for a vehicle of  claim 7 , wherein an opening/closing valve is disposed in the first passage between the radiator and the water pump. 
     
     
         9 . A control method of an engine cooling system for a vehicle according to a season mode, in which a water pump that supplies an engine with a coolant is disposed at a coolant inlet side of the engine, a radiator is disposed to cool the heated coolant of the engine through exchanging heat with outside air, a control valve is disposed at a coolant outlet side of the engine, wherein the control valve is connected with the radiator through a first passage, is connected to a transmission oil cooler (TOC) disposed in the first passage through a second passage, and is connected to a heater through a third passage, and an engine oil cooler (EOC) is disposed in parallel with the TOC between the first passage and the second passage,
 wherein the season mode is divided into a summer engine warm-up mode, a summer oil warm-up mode, a summer coolant temperature control mode, and a summer maximum cooling performance demand mode, and a winter engine warm-up mode, a winter engine warm-up and heating mode, a heating and oil heating mode, and a heating and coolant temperature control mode, and   in the summer engine warm-up mode and the winter engine warm-up mode, the coolant is prevented from being exhausted from the engine and the control valve closes the first, second, and third passages so as to raise the engine temperature.   
     
     
         10 . The control method of an engine cooling system for a vehicle of  claim 9 , in the summer oil warm-up mode, the control valve closes the first and third passages and opens the second passage such that the heated coolant of the engine is supplied to the TOC and the EOC to raise the temperature of the transmission oil and engine oil. 
     
     
         11 . The control method of an engine cooling system for a vehicle of  claim 9 , wherein in the summer coolant temperature control mode, the control valve opens the first passage connected to the radiator and the second passage such that the cooled coolant of the radiator is mixed with the heated coolant of the engine and the mixed coolant having an appropriate temperature passes the TOC and the EOC to be supplied to the engine. 
     
     
         12 . The control method of an engine cooling system for a vehicle of  claim 10 , wherein a predetermined flow rate of the coolant flowing in the first passage and the second passage passes the EOC. 
     
     
         13 . The control method of an engine cooling system for a vehicle of  claim 11 , wherein a predetermined flow rate of the coolant flowing in the first passage and the second passage passes the EOC. 
     
     
         14 . The control method of an engine cooling system for a vehicle of  claim 9 , wherein in the summer maximum cooling performance mode, the control valve opens the first passage such that the coolant exhausted from the engine is supplied to the radiator at a maximum flow rate and the coolant cooled by the radiator passes the TOC and the EOC to be supplied to the engine. 
     
     
         15 . The control method of an engine cooling system for a vehicle of  claim 9 , wherein in the winter engine warm-up and heating mode, the control valve opens the third passage so as to maximize interior heating performance such that the high temperature coolant of the engine passes the heater to be supplied to the engine again. 
     
     
         16 . The control method of an engine cooling system for a vehicle of  claim 9 , wherein in the winter heating and oil heating mode, the control valve opens the second passage and the third passage such that the high temperature coolant of the engine is supplied to the TOC and the EOC to circulate in the engine again. 
     
     
         17 . The control method of an engine cooling system for a vehicle of  claim 9 , wherein in the winter heating and coolant temperature control mode, the control valve opens the first, second, and third passages such that the coolant circulates in the radiator, the TOC, the EOC, and the heater.