Abstract:
A coolant control valve that selectively supplies an EGR cooler with coolant may include a cylinder head having a first water jacket and a second water jacket, an EGR cooler that is disposed at one side of the cylinder head and is disposed on an EGR line that recirculates exhaust gas from an exhaust side to an intake side, a heater that is disposed at another side of the cylinder head and heats air through coolant that is supplied to the heater, and a coolant control valve that respectively controls coolant that is supplied from the first water jacket and the second water jacket, supplies the heater with the coolant, and selectively supplies the EGR cooler with the coolant depending on a temperature of the coolant.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     The present application claims priority to Korean Patent Application No. 10-2014-0068535 filed Jun. 5, 2014, the entire contents of which is incorporated herein for all purposes by this reference. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention is related to a coolant control valve that selectively supplies an EGR cooler with coolant, which selectively circulates an EGR cooler with coolant depending on a driving condition of an engine instead of an EGR valve. 
     Description of Related Art 
     Generally, in a vehicle, fuel is burned in a cylinder to be expended, and then exhaust gas is exhausted to an outside through an exhaust manifold. 
     Most of the exhaust gas is vapor and CO2, and includes carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx). 
     An exhaust gas recirculation system reduces nitrogen oxide of the exhaust gas by recirculating exhaust gas to an intake manifold such that combustion temperature is lowered and the nitrogen oxide is reduced, when air fuel mixture is combusted. 
     Then, the combustion speed is reduced, if the increment of the combustion temperature is suppressed, resultantly, the nitrogen oxide can be reduced. 
     Meanwhile, an exhaust gas recirculation valve is disposed between an exhaust manifold and an intake manifold and opens or closes a circulation line by controlling an EGR valve in a specific rotation area. 
     An EGR valve is opened depending on an opening rate of a throttle valve to recirculate exhaust gas to an intake manifold of an engine such that the output decrement of the engine is minimized and combustion temperature is decreased to amount of the nitrogen oxide (Nox). 
     The exhaust gas recirculation device includes an EGR pipe, an EGR valve that is disposed on the EGR pipe to open or close the EGR pipe, and an EGR cooler that is disposed on the EGR pipe to cool the recirculation gas passing the EGR pipe. 
     An inlet is formed at one side of the EGR cooler to receive the coolant of an engine, and an outlet is formed at the other side thereof to exhaust the coolant that cools the recirculation. 
     Meanwhile, an EGR coolant valve is disposed to control the coolant passing the EGR cooler, the cost is increased due to the EGR coolant valve, and a separate actuator is necessary to control the EGR coolant valve. 
       FIG. 7  is a schematic diagram showing an EGR cooler that is related to the present invention. Referring to  FIG. 7 , the figure includes an EGR line  710 , an EGR cooler  560 , a bypass line  700 , a bypass valve  730 , and an EGR valve  720 . 
     EGR gas that is recirculated from an exhaust line to an intake line passes an EGR line  710  and an EGR cooler  560  to join the intake line, the EGR gas flow the bypass line  700  bypassing the EGR cooler  560 , and a bypass valve  730  is necessary and a separate actuator is also necessary. 
     The information disclosed in this Background of the Invention section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art. 
     BRIEF SUMMARY 
     Various aspects of the present invention are directed to providing a coolant control valve that selectively supplies an EGR cooler with coolant having advantages of improving structure of a coolant control valve and decreasing the number of components and production cost. 
     According to various aspects of the present invention, a coolant control valve that selectively supplies an EGR cooler with coolant may include a cylinder head having a first water jacket and a second water jacket, an EGR cooler that is disposed at one side of the cylinder head and is disposed on an EGR line that recirculates exhaust gas from an exhaust side to an intake side, a heater that is disposed at another side of the cylinder head and heats air through coolant that is supplied to the heater, and a coolant control valve that respectively controls coolant that is supplied from the first water jacket and the second water jacket, supplies the heater with the coolant, and selectively supplies the EGR cooler with the coolant depending on a temperature of the coolant. 
     The coolant control valve may include a valve body having a mounting space formed therein, a sealing ring that has a cylindrical shape and is rotatably disposed in the mounting space based on a length direction where a blocking wall is formed in a coolant inlet of a front end portion of the sealing ring, a motor that rotates the sealing ring depending on the coolant temperature, and a plate that is disposed on the valve body, a first passage that is connected to the first water jacket to be opened or closed by the blocking wall depending on a rotation position of the sealing ring is formed, and a second passage that is formed near the first passage and is connected to the second water jacket to continuously supply the heater with coolant. 
     The blocking wall may have a semi-circular shape, and the first passage has a semi-circular shape corresponding to the shape of the blocking wall. 
     A coolant outlet may be formed on the sealing ring and the coolant outlet may be formed from an inner side to an outer side of the sealing ring to supply the coolant that is supplied to the inner side to a radiator and is formed in a rotating direction of the sealing ring. 
     The first passage may be connected to the first water jacket, the second passage may be connected to the second water jacket, and the valve body may be mounted on an outside of the cylinder head through a plate to be fixed thereto. 
     The second water jacket may be formed under the first water jacket, and the first passage may be correspondingly formed under the second passage. 
     In accordance with the present invention for realizing the objects, an EGR valve and an actuator for controlling this are eliminated to be able to decrease the number of components and production cost. 
     Further, a coolant control valve is improved to a relatively simple structure such that cost is saved and the controlling thereof becomes easy. 
     It is understood that the term “vehicle” or “vehicular” or other similar terms as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuel derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more sources of power, for example, both gasoline-powered and electric-powered vehicles. 
     The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description, which together serve to explain certain principles of the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an exemplary coolant control valve that selectively supplies an EGR cooler with coolant according to the present invention. 
         FIG. 2  is a partial exploded perspective view of the exemplary coolant control valve according to the present invention. 
         FIG. 3  is a partial perspective view of a cylinder head that the exemplary coolant control valve is disposed in according to the present invention. 
         FIG. 4A  and  FIG. 4B  show an operational state of the exemplary coolant control valve according to the present invention. 
         FIG. 5  is a schematic diagram of a coolant system that the exemplary coolant control valve is applied to according to the present invention. 
         FIG. 6A  and  FIG. 6B  are partial exploded perspective views of a coolant control valve according to the related art. 
         FIG. 7  is a schematic diagram showing an EGR cooler according to the present invention. 
     
    
    
     It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. 
     DETAILED DESCRIPTION 
     Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that the present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims. 
       FIG. 1  is a perspective view of a coolant control valve that selectively supplies an EGR cooler with coolant according to various embodiments of the present invention. 
     Referring to  FIG. 1 , a coolant control valve  110  includes a valve body  105  and a plate  100 , and a first passage  120  and a second passage  115  are formed on the plate  100  by a predetermined distance. 
     The coolant that is supplied through the first passage  120  is selectively supplied to an EGR cooler  560  and a radiator  500 . And, the coolant that is supplied through the second passage is always supplied to the heater  510 . 
       FIG. 2  is a partial exploded perspective view of a coolant control valve according to various embodiments of the present invention. 
     Referring to  FIG. 2 , a sealing ring  210  is inserted into a mounting space that is formed in the valve housing  105 . The sealing ring  210  has a structure that is rotated by a motor  200 , and a control portion operates the motor  200  depending on the coolant temperature to rotate the sealing ring  210 . 
     The sealing ring  210  has a pipe shape and the exterior circumference thereof slides on the interior circumference of the mounting space of the valve body  105  to form a sealing structure between them. 
     A coolant inlet  215  is formed at a front side of the sealing ring  210 , and a blocking wall  220  is formed on a partial area of the coolant inlet. And, a coolant outlet  205  is formed from the interior toward the exterior of the sealing ring  210 . 
     As shown, the coolant inlet  215  is a semi-circular shape and the blocking wall  220  is a semi-circular shape that is formed at one side of the coolant inlet  215 . Accordingly, the coolant inlet  215  and the blocking wall  220  have a semi-circular shape to form one circular shape. 
     A first passage  120  is formed on the plate  100  corresponding to the coolant inlet  215  of the sealing ring  210 , and the first passage  120  has a semi-circular shape corresponding to the blocking wall  220  or the coolant inlet  215 . 
     In various embodiments of the present invention, if the motor  200  rotates the sealing ring  210 , the blocking wall  220  that is formed in the coolant outlet  205  of a front end portion of the sealing ring  210  selectively closes the first passage  120 , and the coolant that is supplied to the EGR cooler  560  is controlled. 
     And, the coolant that is supplied to the second passage  115  does not pass the sealing ring  210  and is always supplied to the heater  510  through a separate passage that is formed in the valve body  105 . 
       FIG. 3  is a partial perspective view of a cylinder head that a coolant control valve is disposed in according to various embodiments of the present invention. 
     Referring to  FIG. 3 , a first water jacket  305  and a second water jacket  310  are formed in the cylinder head  300 , the coolant passing the first water jacket  305  is supplied to the first passage  120 , and the coolant passing the second water jacket  310  is supplied to the second passage  115 . 
     More specifically, the plate  100  is direct engaged with the cylinder head  300  together with the valve body  105  and receives coolant from the first water jacket  305  and second water jacket  310  through the first passage  120  and the second passage  115 , and the first water jacket  305  and second water jacket  310  are formed by a distance in an upper and lower direction. 
       FIG. 4A  and  FIG. 4B  show an operational state of a coolant control valve according to various embodiments of the present invention. 
     Referring to  FIG. 4A , in case that the coolant temperature is lower than a predetermined value, the blocking wall  220  of the sealing ring  210  closes the first passage  120 , the coolant is not supplied to the EGR cooler  560 , and the coolant is supplied to the heater  510  through the second passage  115 . 
     Referring to  FIG. 4B , in case that the coolant temperature is higher than a predetermined value, the first passage  120  is opened by the coolant inlet  215  of the sealing ring  210 , the coolant is supplied to the EGR cooler  560 , and the coolant is supplied to the heater  510  through the second passage  115 . 
     The coolant is selectively supplied to the radiator  500  through the coolant outlet  205  of the sealing ring  210  in  FIG. 4A  and  FIG. 4B . Particularly, the coolant that is supplied to the sealing ring  210  is supplied to the radiator  500  through the coolant outlet  205  of the sealing ring  210  depending on the coolant temperature. 
       FIG. 5  is a schematic diagram of a coolant system that a coolant control valve is applied to according to the present invention. 
     Referring to  FIG. 5 , a coolant system includes a cylinder block  540 , a cylinder head  300 , a coolant control valve  110 , an EGR cooler  560 , a coolant pump  530 , an oil cooler  520 , a heater  510 , and a radiator  500 . 
     The coolant that is pumped by the coolant pump  530  passes the cylinder block  540  and the cylinder head  300  to be supplied to the coolant control valve  110 , and the coolant control valve  110  controls the coolant that is respectively supplied to the EGR cooler  560 , the heater  510 , and the radiator  500 . 
     Further, the coolant that is pumped by the coolant pump  530  passes the oil cooler  520  through the cylinder block  540 . 
       FIG. 6A  and  FIG. 6B  are partial exploded perspective views of a coolant control valve showing a related art of the present invention. 
     Referring to  FIG. 6A  and  FIG. 6B , a blocking wall  220  is not formed on the sealing ring  210 , a circularly opened coolant inlet  215  is formed therein, and when the motor  200  opens the sealing ring  210 , the coolant is always supplied to the sealing ring  210 . 
     Accordingly, as described above, because the blocking wall  220  is not formed on the coolant inlet of the sealing ring  210 , a controlling efficiency is deteriorated and the coolant cannot be variably controlled. 
     However, in various embodiments of the present invention, the blocking wall  220  is formed in the coolant inlet  215  of the sealing ring  210  and a first passage  120  is formed on the plate  100  such that the coolant is efficiently controlled, and a separate second passage  115  is formed on the plate  100  and the coolant that passes the second passage  115  does not pass the sealing ring  210  to be direct supplied to the heater  510  through the valve body  105 . 
     For convenience in explanation and accurate definition in the appended claims, the terms “upper”, “lower”, “inner” and “outer” are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. 
     The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.