Engine cooling system

Abstract

An engine cooling system may include a cylinder head arranged on a cylinder block, a main thermostat arranged to control a coolant to be supplied to the cylinder block and the cylinder head according to a coolant temperature, and a coolant control valve unit having a first inlet for introduction of a block coolant which is the coolant supplied to and passed through the cylinder block and a second inlet for introduction of a head coolant which is the coolant supplied to and passed through the cylinder head, and controlling flows of the block coolant and the head coolant separately, as one unit.

What is claimed is: 
     
         1 . An engine cooling system comprising:
 a cylinder head arranged on a cylinder block;   a main thermostat arranged to control a coolant to be supplied to the cylinder block and the cylinder head according to a coolant temperature; and   a coolant control valve unit having a first inlet for introduction of a block coolant which is the coolant supplied to and passed through the cylinder block and a second inlet for introduction of a head coolant which is the coolant supplied to and passed through the cylinder head, and controlling flows of the block coolant and the head coolant separately, as one unit.   
     
     
         2 . The engine cooling system of  claim 1 , further comprising a control unit for controlling a coolant valve, wherein the coolant control valve unit includes:
 the coolant valve operated by an actuator for controlling the head coolant, and   a block thermostat operated according to a temperature of the block coolant for controlling the block coolant.   
     
     
         3 . The engine cooling system of  claim 2 , wherein the coolant control valve unit has outlets for supplying the coolant passed through the coolant valve to a heater, an oil cooler, and/or a radiator, respectively. 
     
     
         4 . The engine cooling system of  claim 2 , wherein the coolant passed through the main thermostat is pumped by a coolant pump for supplying the coolant to the cylinder block and the cylinder head. 
     
     
         5 . The engine cooling system of  claim 2 , wherein the system is opened/closed by the coolant temperature flowing to the main thermostat. 
     
     
         6 . The engine cooling system of  claim 2 , wherein the coolant valve is opened or closed by the control unit according to a temperature of the head coolant. 
     
     
         7 . The engine cooling system of  claim 2 , wherein the block thermostat is opened or closed by the temperature of the block coolant. 
     
     
         8 . The engine cooling system of  claim 2 , wherein if the coolant valve is opened in a state the main thermostat is closed, the coolant circulates to the cylinder head through a heater, an oil cooler, and a coolant pump. 
     
     
         9 . The engine cooling system of  claim 2 , wherein if the coolant valve is opened in a state the main thermostat is opened, the coolant circulates to the cylinder head through a heater, an oil cooler, a radiator, and a coolant pump. 
     
     
         10 . The engine cooling system of  claim 2 , wherein if the coolant valve is opened in a state the block thermostat and the main thermostat are opened, the coolant circulates to the cylinder head through a heater, an oil cooler, a radiator, and a coolant pump.