Engine system having coolant control valve

Abstract

An engine system having a coolant control valve unit includes a valve housing in which a passage having a coolant supplied from one side of the passage and exhausted to another side of the passage is formed, a valve configured to rotate with reference to a rotation center shaft, in which a closing portion closing the passage according to a rotation position and an opening portion opening the passage are formed in the valve with a predetermined interval in a rotation direction, an actuator configured to rotate the valve with reference to the rotation center shaft, and a controller configured to control the actuator according to driving conditions, and a bypass passage penetrating the closing portion of the valve may be formed in a state that the closing portion closes the passage.

What is claimed is: 
     
         1 . An engine system having a coolant control valve unit, comprising:
 a valve housing in which a passage having a coolant supplied from one side and exhausted to another side of the passage is formed;   a valve for rotating with reference to a rotation center shaft, wherein a closing portion closing the passage according to a rotation position of the valve and an opening portion opening the passage are formed in the valve with a predetermined interval in a rotation direction;   an actuator for rotating the valve with reference to the rotation center shaft; and   a controller for controlling the actuator according to driving conditions,   wherein a bypass passage penetrating the closing portion of the valve is formed in a state that the closing portion closes the passage.   
     
     
         2 . The engine system of  claim 1 , wherein:
 an exterior circumference of the closing portion of the valve is formed in a sphere shape, and the opening portion is formed in a circular shape along a circumference of the passage.   
     
     
         3 . The engine system of  claim 2 , further comprising:
 a connecting member integrally connecting an upper portion with a lower portion of the valve,   wherein the opening portion is formed between the closing portion and the connecting member.   
     
     
         4 . The engine system of  claim 3 , further comprising:
 a pipe member integrally connecting a lower end portion of the connecting member with an inner side surface of the closing portion,   wherein the bypass passage is formed at a center portion of the pipe member.   
     
     
         5 . The engine system of  claim 4 , further comprising:
 a coolant temperature sensor disposed at the valve housing to sense a temperature of a coolant passing through an inlet of the pipe member connected with the lower end portion of the connecting member.   
     
     
         6 . The engine system of  claim 1 , wherein:
 a head coolant inlet that a coolant is supplied from a cylinder head of the engine and a block coolant inlet that the coolant is supplied from a cylinder block of the engine are formed at the valve housing, and   the valve controls the coolant supplied from the head coolant inlet.   
     
     
         7 . The engine system of  claim 6 , further comprising:
 a block thermostat operating according to a coolant temperature to open or close the second passage.   
     
     
         8 . The engine system of  claim 6 , wherein:
 the coolant supplied from the head coolant inlet and the block coolant inlet is respectively distributed to   a heater core conducting heat exchange with indoor air;   an oil cooler conducting heat exchange with oil circulating the engine; and   a radiator conducting heat exchange with outdoor air.   
     
     
         9 . The engine system of  claim 8 , further comprising:
 a radiator thermostat controlling the coolant operated by the controller and supplied to the radiator according to temperature of the coolant exhausted from the radiator.   
     
     
         10 . The engine system of  claim 8 , wherein:
 the coolant exhausted from the heater core, the oil cooler, and the radiator is pumped to the cylinder block of the engine, and the pumped coolant circulates through the cylinder head and the cylinder block.   
     
     
         11 . An engine system having a coolant control valve unit, comprising:
 a valve housing including, at one side thereof, a head coolant inlet that a head coolant is supplied from a cylinder head of the engine and a block coolant passage that a block coolant is supplied from a cylinder block of the engine, wherein a first passage connected with the head coolant inlet and a second passage connected with the block coolant passage are formed in the valve housing;   a mixing housing disposed at another side of the valve housing, in which the coolant passing through the first and second passages gather, and configured to distribute the coolant to respective coolant demanding elements;   a valve for rotating with reference to a rotation center shaft, wherein a closing portion closing the first passage according to a rotation position of the valve and an opening portion opening the passage are formed in the valve with a predetermined interval in a rotation direction;   a block thermostat operating according to a coolant temperature to open or close the second passage;   an actuator for rotating the valve with reference to the rotation center shaft; and   a controller for controlling the actuator according to driving conditions,   wherein a bypass passage penetrates the closing portion of the valve in a state that the closing portion closes the passage.   
     
     
         12 . The engine system of  claim 11 , wherein:
 an exterior circumference of the closing portion of the valve is formed in a sphere shape, and the opening portion is formed in a circular shape along a circumference of the passage.   
     
     
         13 . The engine system of  claim 12 , further comprising:
 a connecting member integrally connecting an upper portion with a lower portion of the valve;   wherein the opening portion is formed between the closing portion and the connecting member.   
     
     
         14 . The engine system of  claim 13 , further comprising:
 a pipe member integrally connecting a lower end portion of the connecting member with an inner side surface of the closing portion;   wherein the bypass passage is formed at a center portion of the pipe member.   
     
     
         15 . The engine system of  claim 14 , further comprising:
 a coolant temperature sensor disposed at the valve housing to sense a temperature of a coolant passing through an inlet of the pipe member connected with the lower end portion of the connecting member.   
     
     
         16 . The engine system of  claim 11 , wherein:
 the respective coolant demanding elements include:
 a heater core conducting heat exchange with indoor air; 
 an oil cooler conducting heat exchange with oil circulating the engine; and 
 a radiator conducting heat exchange with outdoor air. 
   
     
     
         17 . The engine system of  claim 16 , further comprising:
 a radiator thermostat controlling the coolant operated by the controller and supplied to the radiator according to temperature of the coolant exhausted from the radiator.