Abstract:
A cooling system of an engine may include a cylinder liner formed in a hollow cylindrical shape and pressed against an inside of a cylinder of the engine, a block coolant jacket positioned in an outer side of the cylinder liner in a radial direction to cool a cylinder block, the cylinder block provided with the cylinder liner and the block coolant jacket therein, and a cylinder head engaged on the cylinder block, including an exhaust port and an intake port fluidically-communicated with a combustion chamber and respectively formed at an exhaust side and an intake side, and provided with a head coolant jacket inside, in which the block coolant jacket includes an upper coolant jacket and a lower coolant jacket and a division wall is disposed between the upper coolant jacket and the lower coolant jacket to block fluid flow therebetween.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    The present application claims priority to Korean Patent Application No. 10-2015-0129218, filed Sep. 11, 2015, the entire contents of which is incorporated herein for all purposes by this reference. 
       BACKGROUND OF THE INVENTION 
       [0002]    Field of the Invention 
         [0003]    The present invention relates to a cooling system of an engine dividing vertically a coolant jacket corresponding to a cylinder liner of a cylinder block and controlling a flow of a coolant circulating the coolant jacket to improve an entire cooling efficiency and to reduce an abnormal combustion of a combustion chamber. 
         [0004]    Description of Related Art 
         [0005]    Engines produce torque by burning a fuel to create energy, and discharge surplus thermal energy. Particularly, a coolant absorbs thermal energy as it circulates through an engine, a heater, and a radiator, and releases the thermal energy. 
         [0006]    Oil becomes highly viscous at low engine coolant temperatures. With thick oil, friction and fuel consumption increase, and exhaust gas temperatures rise gradually, lengthening the time taken for catalyst activation and causing deterioration in exhaust gas quality. Moreover, it takes a long time to get a heater to function normally, so passengers and a driver will feel cold at low temperatures. 
         [0007]    When the engine coolant temperature is excessively high, knocking may occur. If ignition timing is adjusted to suppress knocking, the engine performance may be degraded. In addition, excessive lubricant temperatures may result in poor lubrication. 
         [0008]    However, one coolant control valve is used in specific regions of an engine, and is a valve that controls a number of cooling elements, like keeping the coolant at high temperatures and other regions at low temperatures. 
         [0009]    Among the several cooling elements, a cylinder block and a cylinder head are important, and a technique of separately cooling the cylinder block and the cylinder head has been researched. 
         [0010]    On the other hand, since the top part of the cylinder block is adjacent to the combustion chamber, the temperature thereof is high, since the bottom part of the cylinder block is far away from combustion chamber, the temperature thereof is low, in this case, because the coolant is controlled by one coolant jacket, it is difficult to respectively control the top part and the bottom part to be optimized. 
         [0011]    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 
       [0012]    Various aspects of the present invention are directed to providing a cooling system of an engine dividing vertically a coolant jacket corresponding to a cylinder liner of a cylinder block to form an upper coolant jacket and a lower coolant jacket and controlling a coolant circulating the upper coolant jacket and the lower coolant jacket, thereby reducing an abnormal combust and decreasing a fuel consumption. 
         [0013]    According to various aspects of the present invention, a cooling system of an engine may include a cylinder liner formed in a hollow cylindrical shape and pressed against an inside of a cylinder of the engine, a block coolant jacket positioned in an outer side of the cylinder liner in a radial direction to cool a cylinder block, the cylinder block provided with the cylinder liner and the block coolant jacket therein, and a cylinder head engaged on the cylinder block, including an exhaust port and an intake port fluidly communicated with a combustion chamber and respectively formed at an exhaust side and an intake side, and provided with a head coolant jacket inside, in which the block coolant jacket may include an upper coolant jacket formed in a shape covering an upper portion of the cylinder liner, and a lower coolant jacket formed in a shape covering a lower portion of the cylinder liner and separated from the upper coolant jacket, and a division wall may be disposed between the upper coolant jacket and the lower coolant jacket to block fluid flow therebetween. 
         [0014]    The upper coolant jacket may include an exhaust side upper coolant jacket formed at the exhaust side, and an intake side upper coolant jacket formed at the intake side, and a coolant discharged from a coolant pump may sequentially pass through the exhaust side upper coolant jacket, the head coolant jacket, and the intake side upper coolant jacket. 
         [0015]    The lower coolant jacket may include an exhaust side lower coolant jacket formed at the exhaust side, and an intake side lower coolant jacket formed at the intake side, and the coolant passing through the exhaust side upper coolant jacket, the head coolant jacket, and the intake side upper coolant jacket may sequentially pass through the intake side lower coolant jacket and the exhaust side lower coolant jacket to execute cooling thereof. 
         [0016]    The coolant discharged from the coolant pump may sequentially pass through the exhaust side upper coolant jacket, the head coolant jacket, the intake side upper coolant jacket, the intake side lower coolant jacket, and the exhaust side lower coolant jacket may be circulated to the coolant pump to perform cooling thereof. 
         [0017]    The cooling system of the engine may further include a coolant control module disposed in a coolant line connected from the intake side upper coolant jacket to the intake side lower coolant jacket to control flow of the coolant. 
         [0018]    The coolant control module may distribute the coolant to at least one of a radiator to radiate a heat of the coolant, an EGR cooler to control temperature of the recirculating exhaust gas, an oil cooler to control an oil temperature of the engine, a transmission oil cooler to control oil temperature of a transmission, and a heater disposed for an indoor heating, and the coolant control module may control distributed coolant. 
         [0019]    According to various aspects of the present invention, a cooling system of an engine may include a cylinder liner formed in a hollow cylindrical shape and pressed against an inside of a cylinder of the engine, a block coolant jacket positioned in an outer side of the cylinder liner in a radial direction to cool a cylinder block, the cylinder block provided with the cylinder liner and the block coolant jacket therein, a cylinder head engaged on the cylinder block, including an exhaust port and an intake port communicated with a combustion chamber and respectively formed at an exhaust side and an intake side, and provided with a head coolant jacket inside, in which the block coolant jacket includes, an exhaust side upper coolant jacket formed at the exhaust side, an exhaust side lower coolant jacket formed under the exhaust side upper coolant jacket, an intake side upper coolant jacket formed at the intake side, and an intake side lower coolant jacket formed under the intake side upper coolant jacket, and the coolant may execute the cooling while sequentially passing through the exhaust side upper coolant jacket, the head coolant jacket, the intake side upper coolant jacket, the intake side lower coolant jacket, and the exhaust side lower coolant jacket. 
         [0020]    A coolant pump may pump the coolant to the exhaust side upper coolant jacket. 
         [0021]    The cooling system of the engine may further include a coolant control module to control a flow of the coolant exhausted from the intake side upper coolant jacket. 
         [0022]    The cooling system of the engine may further include a branch line branched from a coolant line formed between the intake side upper coolant jacket and the coolant control module and connected to the intake side lower coolant jacket. 
         [0023]    The branch line may include a control valve disposed to control the flow of the coolant. 
         [0024]    A division wall may be formed between the exhaust side upper coolant jacket and the exhaust side lower coolant jacket, and between the intake side upper coolant jacket and the intake side lower coolant jacket. 
         [0025]    The block coolant jacket may be formed along an outer surface of the cylinder liner. 
         [0026]    According to various embodiments of the present invention, the coolant jacket corresponding to the cylinder liner of the cylinder block is divided into the upper coolant jacket and the lower coolant jacket to respectively control the coolant supplied thereto, thereby further effectively controlling the cooling temperature. 
         [0027]    Furthermore, as the coolant sequentially flows the exhaust side upper coolant jacket, the head coolant jacket, the intake side upper coolant jacket, the intake side lower coolant jacket, and the exhaust side lower coolant jacket, the upper side temperature of the cylinder block is controlled to be relatively low and the lower side temperature is controlled to be relatively high such that the fuel consumption may be reduced and the cooling efficiency may be improved, and the abnormal ignition due to the overheating of the combustion chamber may be previously prevented. 
         [0028]    Also, by the structure that the coolant is transmitted to the coolant pump through the lower coolant jacket, the cooling passage may be removed or shortened, thereby simply configuring the layout thereof. 
         [0029]    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. 
         [0030]    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 
         [0031]      FIG. 1  is a schematic side view of a cylinder block and a cylinder head in a cooling system of an engine according to various embodiments of the present invention. 
           [0032]      FIG. 2  is an entire schematic diagram showing a flow of a coolant in a cooling system of an engine according to various embodiments of the present invention. 
           [0033]      FIG. 3  is an entire schematic diagram showing a flow of a coolant in a cooling system of an engine according to various embodiments of the present invention. 
       
    
    
       [0034]    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 
       [0035]    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. 
         [0036]      FIG. 1  is a schematic side view of a cylinder block and a cylinder head in a cooling system of an engine according to various embodiments of the present invention. 
         [0037]    Referring to  FIG. 1 , the cooling system of the engine includes a cylinder block  110  and a cylinder head  100  disposed on the cylinder block  110 , and the cylinder block  110  is formed with a cylinder liner  146  disposed to be inserted by a piston. Here, the cylinder liner  146  may be integrally or monolithically formed with the cylinder block  110 , or in other embodiments, may be separately installed. 
         [0038]    A block coolant jacket is formed outside the cylinder liner  146  in the cylinder block  110 . Here, the block coolant jacket includes an upper coolant jacket  130  and a lower coolant jacket  120 , and the upper coolant jacket  130  and the lower coolant jacket  120  are divided vertically by a division wall  145 . 
         [0039]    The upper coolant jacket  130  includes an exhaust side upper coolant jacket  132  formed at an exhaust side and an intake side upper coolant jacket  134  formed at an intake side. The lower coolant jacket  120  includes an exhaust side lower coolant jacket  122  formed at the exhaust side and an intake side lower coolant jacket  124  formed at the intake side. 
         [0040]    Furthermore, the head coolant jacket  102  is formed inside the cylinder head  100 , the head coolant jacket  102  and the exhaust side upper coolant jacket  132  may be connected and the head coolant jacket  102  and the intake side upper coolant jacket  134  may be connected. 
         [0041]      FIG. 2  is an entire schematic diagram showing a flow of a coolant in a cooling system of an engine according to various embodiments of the present invention. 
         [0042]    Referring to  FIG. 2 , the cooling system of the engine includes the coolant pump  200 , the exhaust side upper coolant jacket  132 , the cylinder head  100 , the intake side upper coolant jacket  134 , the coolant control module  210 , the intake side lower coolant jacket  124 , the exhaust side lower coolant jacket  122 , the radiator  220 , the EGR cooler  232 , the turbocharger  230 , the oil cooler  242 , an Automatic Transmission Fluid (ATF) cooler  240 , a throttle body  260 , and a heater  250 . 
         [0043]    Also, an exhaust port  104  and an intake port  106  are formed corresponding to each cylinder  101  in the cylinder head  100 , the head coolant jacket  102  is formed around the exhaust port and the intake port therein, and the division wall  145  is formed between the upper coolant jacket  130  and the lower coolant jacket  120 . 
         [0044]    In various embodiments of the present invention, the division wall  145  may be integrally or monolithically formed with the cylinder block  110 , or in other embodiments, may be installed as a separated insert element. Furthermore, as these elements are generally known in the art, a detailed description for the turbocharger  230 , the EGR cooler  232 , the ATF cooler  240 , the oil cooler  242 , the heater  250 , and the throttle body  260  will be omitted in this specification. 
         [0045]    As described above referring to the  FIG. 1 , the block coolant jacket is positioned in an outer side of the cylinder liner  146  in a radial direction, the block coolant jacket is separated into the upper coolant jacket  130  and the lower coolant jacket  120  by the division wall  145 . 
         [0046]    From this configuration, as shown in  FIG. 2 , the coolant pumped by the coolant pump  200  sequentially flows through the exhaust side upper coolant jacket  132 , the head coolant jacket  102  which is formed inside of the cylinder head  100 , the intake side upper coolant jacket  134 , and the coolant control module  210 . Also, depending on a control mode of the coolant control module  210 , the coolant may be circulated to the coolant pump  200  after sequentially passing through the intake side lower coolant jacket  124  and the exhaust side lower coolant jacket  122 . Accordingly, the coolant discharged from the coolant pump  200  is relatively low temperature, and may be supplied into the upper coolant jacket  130 , and the coolant passed through the cylinder head  100  is relatively high temperature, and may be supplied into the lower coolant jacket  120 . 
         [0047]    Therefore knocking of the engine is decreased since an upper portion of the cylinder liner  146  is cooled at low heat. And it can be possible to cut fuel consumption and reduce friction by increasing the temperature of the lower portion of the cylinder block  110 . 
         [0048]    The coolant control module  210  respectively controls the coolant that is distributed to the intake side lower coolant jacket  124 , the oil cooler  242 , the throttle body  260 , and the radiator  220 . Furthermore, the coolant control module  210  may bypass the coolant supplied from the intake side upper coolant jacket  134  to the coolant pump  200  without distribution into each cooling element. 
         [0049]    Furthermore, the structure of the coolant control module  210  is generally known in the art and a detailed description of the structure thereof is omitted. 
         [0050]      FIG. 3  is an entire schematic diagram showing a flow of a coolant in a cooling system of an engine according to various embodiments of the present invention, and  FIG. 3  will be mainly described with respect to characteristic parts compared with  FIG. 2 . 
         [0051]    Referring to  FIG. 3 , the cooling system of the engine includes the coolant pump  200 , the exhaust side upper coolant jacket  132 , the cylinder head  100 , the intake side upper coolant jacket  134 , the control valve  300 , the coolant control module  210 , the intake side lower coolant jacket  124 , the exhaust side lower coolant jacket  122 , the radiator  220 , EGR cooler  232 , the turbocharger  230 , the oil cooler  242 , the ATF cooler  240 , the throttle body  260 , and the heater  250 . 
         [0052]    Also, an exhaust port  104  and an intake port  106  are formed corresponding to each cylinder  101  in the cylinder head  100 , the head coolant jacket  102  is formed around the exhaust port  104  and the intake port  106  therein, and the division wall  145  is formed between the upper coolant jacket  130  and the lower coolant jacket  120 . 
         [0053]    The coolant pumped by the coolant pump  200  sequentially flows through the exhaust side upper coolant jacket  132 , the head coolant jacket  102 , the intake side upper coolant jacket  134 , and the coolant control module  210 . 
         [0054]    Also, a branch line  140  is branched from the coolant line  135  between the intake side upper coolant jacket  134  and the coolant control module  210 , the branch line  140  is connected to the intake side lower coolant jacket  124 , and the control valve  300  is provided in the branch line  140 . 
         [0055]    Depending on the opening/closing of the control valve  300 , the coolant of the intake side upper coolant jacket  134  is circulated to the coolant pump  200  after passing through the intake side lower coolant jacket  124  and the exhaust side lower coolant jacket  122  through the control valve  300  of the branch line  140 . 
         [0056]    In various embodiments of the present invention, the block coolant jacket formed around the cylinder liner  146  of the cylinder block  110  is divided into the upper coolant jacket  130  and the lower coolant jacket  120 , and the coolant supplied thereto is respectively controlled, thereby further effectively controlling the cooling temperature. 
         [0057]    Furthermore, as the coolant sequentially flows to the exhaust side upper coolant jacket  132 , the head coolant jacket  102 , the intake side upper coolant jacket  134 , the intake side lower coolant jacket  124 , and the exhaust side lower coolant jacket  122 , the temperature of the upper part of the cylinder block  110  is controlled to be relatively low, and the temperature of the lower part thereof is controlled to be relatively high, thereby reducing the fuel consumption and improving the cooling efficiency. 
         [0058]    Also, by the structure that the coolant is transmitted to the coolant pump  200  through the lower coolant jacket  120 , the cooling passage may be removed or shortened, thereby simply configuring the layout thereof. 
         [0059]    For convenience in explanation and accurate definition in the appended claims, the terms “upper” or “lower”, “inner” or “outer” and etc. are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. 
         [0060]    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.