An engine retarder cooling system and method

Abstract

The embodiment of the present application discloses an engine retarder cooling system and method, which are used to avoid excessive cold-start wear caused by the lack of lubrication of the retarder. The embodiment of the present application includes: a radiator, a retarder, a first solenoid valve, a second solenoid valve, an engine, a thermostat, a water pump, and an engine electronic control unit; the thermostat is connected to the engine; the engine is connected to the water pump; one end of the radiator is connected to the water pump, and the other end is respectively connected to the thermostat and the retarder, and the retarder is used to slow down the driving speed of the vehicle; one end of the first solenoid valve is connected to the retarder, and the other end is connected to the thermostat; one end of the second solenoid valve is connected to the retarder, and the other end is connected to the water pump, and the first solenoid valve and the second solenoid valve are used to control the water inlet flow rate into the retarder; the engine electronic control unit is arranged on the engine; when it is detected that the retarder needs to be cooled, the engine electronic control unit is used to control the valve states of the first solenoid valve and the second solenoid valve.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of engines, and in particular, to an engine retarder cooling system and method. Background Art

[0002] With the development of society, vehicles have gradually become an essential means of transportation for families or companies to travel. Users' attention to vehicle safety has gradually increased, and more stringent regulations and requirements have been imposed on the vehicle braking system. In order to comply with the market development, more vehicles have started to install retarders to meet the needs of users.

[0003] At present, the working principle of the vehicle retarder is to convert the kinetic energy of the vehicle into heat energy, and then dissipate the heat energy through the engine cooling system. During the cold cycle, after the cold vehicle starts, the engine gradually warms up. Since the temperature of the cooling water is not high enough to open the thermostat in the system, the cooling water can only circulate in the engine through the water pump for cold vehicle circulation to enable the engine to reach the normal working temperature as soon as possible. At this time, the retarder takes water from before the thermostat to cool the retarder, and then returns to before the water pump for circulation.

[0004] Because the oil temperature of the retarder is relatively low, it is necessary to quickly reach the most suitable oil temperature. However, since the water temperature of the cooling water is relatively low at this time, the heating rate of the retarder oil is reduced, and the retarder cannot be lubricated properly, resulting in excessive cold vehicle wear, which affects the service life of the vehicle retarder. Summary of the Invention

[0005] The embodiments of the present application provide an engine retarder cooling system and method, which are used to avoid the problem of excessive cold vehicle wear caused by improper lubrication of the retarder and improve the service life of the vehicle retarder.

[0006] The present application provides an engine retarder cooling system in a first aspect, including:

[0007] A radiator, a retarder, a first solenoid valve, a second solenoid valve, an engine, a thermostat, a water pump, and an engine electronic control unit;

[0008] The thermostat is connected to the engine, and the thermostat is used to control the engine cooling water and intake air temperature;

[0009] The engine is connected to the water pump;

[0010] One end of the radiator is connected to the water pump, and the other end is respectively connected to the thermostat and the retarder. The retarder is used to slow down the vehicle speed, and the water pump is used to pressurize the cooling water;

[0011] One end of the first solenoid valve is connected to the retarder, and the other end is connected to the thermostat;

[0012] One end of the second solenoid valve is connected to the retarder, and the other end is connected to the water pump. The first solenoid valve and the second solenoid valve are used to control the water inlet flow rate into the retarder;

[0013] The engine electronic control unit is provided on the engine;

[0014] When it is detected that the retarder needs to be cooled, the engine electronic control unit is used to control the valve states of the first solenoid valve and the second solenoid valve.

[0015] Optionally, the cooling system further includes: a water temperature sensor;

[0016] The water temperature sensor is provided between the thermostat and the retarder, and the water temperature sensor is used to sense the temperature of the cooling water passing through the engine.

[0017] Optionally, the cooling system further includes: an oil temperature sensor;

[0018] The oil temperature sensor is provided on the retarder, and the oil temperature sensor is used to sense the oil temperature of the retarder.

[0019] Optionally, the cooling system further includes: a retarder judgment module;

[0020] The retarder judgment module is provided on the retarder. The retarder judgment module is used to judge whether the retarder reaches the condition that needs to be cooled according to the oil temperature sensed by the oil temperature sensor, and send an electrical signal corresponding to the judgment result to the engine electronic control unit.

[0021] Optionally, the retarder is fixedly connected to the first solenoid valve and the second solenoid valve respectively through fixed clamps.

[0022] Optionally, the joints between the retarder and the first solenoid valve and the second solenoid valve are coated with airtight glue.

[0023] The present application provides an engine retarder cooling method in a second aspect, including:

[0024] Obtain the oil temperature reading of the retarder within a preset time, where the oil temperature reading is the oil temperature reading of the retarder sensed by the oil temperature sensor;

[0025] Obtain the water temperature reading of the cooling water within a preset time, where the water temperature reading is the temperature reading of the cooling water passing through the engine sensed by the water temperature sensor;

[0026] Judge whether the retarder needs to be cooled according to the oil temperature indication and the water temperature indication;

[0027] If so, judge whether the water temperature indication reaches a preset value;

[0028] When the water temperature indication reaches the preset value, determine that the engine is in a state of too high water temperature, and control the first solenoid valve to close and determine the adjustment opening of the second solenoid valve according to the state of too high water temperature.

[0029] Optionally, the judging whether the retarder needs to be cooled according to the oil temperature indication and the water temperature indication includes:

[0030] Determine the water temperature indication of the cooling water required by the retarder according to the oil temperature indication;

[0031] Judge whether the water temperature indication of the cooling water is lower than the water temperature indication. If so, determine that the retarder needs to be cooled;

[0032] If not, determine that the retarder does not need to be cooled.

[0033] Optionally, after judging whether the retarder needs to be cooled according to the oil temperature indication and the water temperature indication, the cooling method further includes:

[0034] If not, control the first solenoid valve and the second solenoid valve to close.

[0035] Optionally, after judging whether the water temperature indication reaches the preset value, the cooling method further includes:

[0036] When the water temperature indication does not reach the preset value, determine that the engine is in a state of not too high water temperature, and control the first solenoid valve to open and the second solenoid valve to close according to the state of not too high water temperature.

[0037] It can be seen from the above technical solutions that the embodiments of the present application have the following advantages:

[0038] A retarder cooling system is provided with a radiator, a retarder, a first solenoid valve, a second solenoid valve, an engine, a thermostat, a water pump, and an engine electronic control unit. The thermostat is connected to the engine; the engine is connected to the water pump; one end of the radiator is connected to the water pump, and the other end is respectively connected to the thermostat and the retarder. The retarder is used to slow down the driving speed of the vehicle; one end of the first solenoid valve is connected to the retarder, and the other end is connected to the thermostat; one end of the second solenoid valve is connected to the retarder, and the other end is connected to the water pump. The first solenoid valve and the second solenoid valve are used to control the water inlet flow rate into the retarder; the engine electronic control unit is arranged on the engine; when it is detected that the retarder needs to be cooled, the engine electronic control unit is used to control the opening degrees of the valves of the first solenoid valve and the second solenoid valve. Among them, adjusting the opening degrees of the first solenoid valve and the second solenoid valve can adjust the temperature of the water inlet into the retarder, ensure that the retarder is at the most suitable oil temperature, thus avoiding the problem of excessive cold vehicle wear due to non-lubrication of the retarder, and improving the service life of the vehicle retarder. Brief Description of the Drawings

[0039] Figure 1 It is an overall structural schematic diagram of the engine retarder cooling system in an embodiment of the present application;

[0040] Figure 2 It is a schematic flow chart of an embodiment of the engine retarder cooling method in an embodiment of the present application;

[0041] Figure 3 It is a schematic flow chart of another embodiment of the engine retarder cooling method in an embodiment of the present application. Detailed Description of the Embodiment

[0042] In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to illustrate the relative positional relationship between each component or constituent part, and do not particularly limit the specific installation orientation of each component or constituent part.

[0043] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to the specific situation.

[0044] In addition, the terms "installed", "set up", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In addition, the structures, proportions, sizes, etc. shown in the drawings in this application are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the implementation conditions of this application. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0046] Next, the technical solutions in this application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by this application.

[0047] An embodiment of this application discloses an engine retarder cooling system and method, which are used to avoid excessive cold-start wear caused by the lack of lubrication of the retarder.

[0048] Please refer to Figure 1 , an embodiment of this application discloses an engine retarder cooling system, including: a radiator 1, a retarder 2, a first solenoid valve 3, a second solenoid valve 4, an engine 5, a thermostat 6, a water pump 7, and an engine electronic control unit 8; the thermostat 6 is connected to the engine 5, and the thermostat 6 is used to control the cooling water and intake air temperature of the engine 5; the engine 5 is connected to the water pump 7; one end of the radiator 1 is connected to the water pump 7, and the other end is respectively connected to the thermostat 6 and the retarder 2. The retarder 2 is used to slow down the driving speed of the vehicle, and the water pump 7 is used to pressurize the cooling water; one end of the first solenoid valve 3 is connected to the retarder 2, and the other end is connected to the thermostat 6; one end of the second solenoid valve 4 is connected to the retarder 2, and the other end is connected to the water pump 7. The first solenoid valve 3 and the second solenoid valve 4 are used to control the water inflow rate into the retarder 2; the engine electronic control unit 8 is installed in the engine 5; when it is detected that the retarder 2 needs to be cooled, the engine electronic control unit 8 is used to control the valve states of the first solenoid valve 3 and the second solenoid valve 4.

[0049] In the embodiment of the present application, in a retarder cooling system provided with a radiator 1, a retarder 2, a first solenoid valve 3, a second solenoid valve 4, an engine 5, a thermostat 6, a water pump 7, and an engine electronic control unit 8, the first solenoid valve 3 and the second solenoid valve 4 are used to control the water inlet flow rate into the retarder 2. When it is detected that the retarder 2 needs to be cooled, the engine electronic control unit 8 is used to control the opening degrees of the valves of the first solenoid valve 3 and the second solenoid valve 4. Among them, by adjusting the opening degrees of the first solenoid valve 3 and the second solenoid valve 4, the temperature of the water entering the retarder 2 can be adjusted to ensure that the retarder 2 is at the most suitable oil temperature, thereby avoiding the problem of excessive cold vehicle wear due to the lack of lubrication of the retarder 2 and improving the service life of the vehicle's retarder.

[0050] Optionally, during the operation of the system, in order to determine whether the retarder 2 needs to be cooled, it is necessary to continuously sense the cooling water temperature of the engine 5 and the oil temperature of the retarder 2, and then judge whether the retarder 2 reaches the condition for cooling based on these two. Therefore, the cooling system also needs to be provided with a water temperature sensor 9, an oil temperature sensor 10, and a retarder judgment module 11. Among them, the water temperature sensor 9 is arranged between the thermostat 6 and the retarder 2, the oil temperature sensor 10 is arranged on the retarder 2, and the retarder judgment module 11 is arranged on the retarder 2.

[0051] After the retarder judgment module 11 judges whether the retarder 2 reaches the condition for cooling according to the oil temperature sensed by the oil temperature sensor 10 and the water temperature sensed by the water temperature sensor 9, it will send an electrical signal capable of displaying this result to the engine electronic control unit 8 according to the generated judgment result, so that the engine electronic control unit 8 adjusts the first solenoid valve 3 and the second solenoid valve 4 according to this electrical signal.

[0052] Optionally, in order to enable the retarder 2 to be more firmly connected to each solenoid valve, a fixed clamp is used for fixed connection.

[0053] In order to improve the airtightness of the cooling system during operation, the joints of the retarder 2 with the first solenoid valve 3 and the second solenoid valve 4 need to be coated with airtight glue to achieve the airtight effect.

[0054] In the embodiment of the present application, the process of cooling the water temperature is essentially divided into two processes, one is the data acquisition process, and the other is the control process. Among them, in the data acquisition process, the cooling water of the engine 5 flows through the water temperature sensor 9 to collect the temperature of the water discharged from the engine 5, and transmits this value to the engine electronic control unit 8.

[0055] The control process is further divided into a cold cycle and a hot cycle process. In the cold cycle, the engine electronic control unit 8 controls the closing of the first solenoid valve 3 and the second solenoid valve 4 according to the temperature of the cooling water collected by the water temperature sensor 9. The cooling water of the engine 5 undergoes a small cycle for rapid heating, quickly raising the engine water temperature, and then quickly raising the engine oil temperature, enabling good lubrication of the engine moving parts and preventing excessive wear during cold starts. Since there is no cooling water to cool the retarder 2 oil, the retarder 2 can also achieve the effect of quickly raising the retarder 2 oil temperature, enabling good lubrication of the retarder 2 moving parts, and ensuring the braking performance and driving safety of the entire vehicle.

[0056] In the hot cycle, as the cooling water temperature of the engine 5 rises, the thermostat 6 opens and the small cycle closes. The engine electronic control unit 8 controls the opening degrees of the first solenoid valve 3 and the second solenoid valve 4 according to the temperature of the cooling water collected by the water temperature sensor 9 and the temperature sensed by the oil temperature sensor 10 corresponding to the actual cooling water demand of the retarder 2, thereby adjusting the inlet water temperature of the retarder 2. During the hot cycle process, the retarder judgment module 11 can judge whether the retarder 2 needs to be cooled. If it does not need to be cooled, the engine electronic control unit 8 controls the closing of the first solenoid valve 3 and the second solenoid valve 4 according to the temperature readings sensed by the oil temperature sensor 10 and the water temperature sensor 9; if it needs to be cooled, the water temperature reading sensed by the water temperature sensor 9 can be used to determine whether the cooling water temperature passing through the engine 5 is higher than a certain preset value. If it is higher than a certain preset value, it is determined that the cooling water temperature passing through the engine 5 is too high. At this time, the engine electronic control unit 8 can determine the closing of the first solenoid valve 3 and the opening degree of the second solenoid valve 4 according to the temperature readings sensed by the oil temperature sensor 10 and the water temperature sensor 9, so as to adjust the inlet water temperature of the retarder 2 and ensure that the retarder 2 is at the most suitable oil temperature. Further, the engine electronic control unit 8 can also adjust the engine cooling system to dissipate heat from the cooling water according to the temperature of the cooling water collected by the water temperature sensor 9, ensuring that the engine is at the most suitable water temperature.

[0057] If it is not higher than a certain preset value, it is determined that the cooling water temperature passing through the engine 5 is not high. At this time, the engine electronic control unit 8 can determine that the first solenoid valve 3 is opened and the second solenoid valve 4 is closed according to the temperature readings sensed by the oil temperature sensor 10 and the water temperature sensor 9. After the cooling water passes through the retarder 2 to cool the retarder 2 oil, it passes through the radiator 1 for cooling and finally returns to the front of the water pump 7 for recycling.

[0058] In the embodiment of the present application, in addition to being able to cool the retarder 2 under certain conditions, the triggering conditions for cooling the buffer 2 can be further optimized by comprehensively considering the cooling water state of the engine 5, improving the cooling efficiency of the retarder 2.

[0059] The above has described in detail the engine retarder cooling system in the embodiments of the present application. Next, the engine retarder cooling method in the embodiments of the present application will be described.

[0060] The method of the embodiments of the present application can be applied to a server, a terminal, or other devices with logical processing capabilities, and specific limitations are not made here. For the convenience of description, the following will be described by taking the engine electronic control unit as the execution subject as an example.

[0061] Please refer to Figure 2 , in an embodiment of the engine retarder cooling method in the embodiments of the present application, it includes:

[0062] 101. The engine electronic control unit obtains the oil temperature reading of the retarder within a preset time;

[0063] In the present application, the engine electronic control unit needs to judge the state of the retarder based on parameters such as the engine oil temperature of the retarder and the cooling water temperature of the engine, and perform corresponding operations according to the judgment result, so that the retarder can always maintain normal temperature operation. Therefore, the engine electronic control unit needs an oil temperature sensor to obtain the engine oil temperature reading of the retarder as the data basis for subsequent judgment.

[0064] 102. The engine electronic control unit obtains the water temperature reading of the cooling water within a preset time;

[0065] After obtaining the engine oil temperature reading of the retarder, it is necessary to further obtain the temperature reading of the cooling water passing through the engine through a water temperature sensor as the data basis for subsequent judgment of the retarder state.

[0066] 103. The engine electronic control unit judges whether the retarder needs to be cooled according to the oil temperature reading and the water temperature reading; if so, execute step 104;

[0067] After obtaining both the oil temperature data and the water temperature data, the engine electronic control unit can judge the state of the retarder based on these two data to see if the retarder needs to be cooled. There are multiple ways to implement the judgment. It can be to set a reference value corresponding to the data, compare the obtained data with the corresponding reference value, and then judge the state of the retarder according to the comparison result; it can also be to perform an operation on the obtained data to obtain a value, and judge the current state of the retarder according to the retarder state corresponding to the value. The specific implementation method is not limited here.

[0068] 104. The engine electronic control unit judges whether the water temperature reading reaches a preset value; if so, execute step 105;

[0069] When the engine electronic control unit determines that the retarder needs to be cooled, it further determines whether the water temperature reading reaches a preset value, where the preset value refers to the water temperature reading of the cooling water required by the retarder within a preset time.

[0070] 105. The engine electronic control unit determines that the engine is in a state of overheating water temperature, and controls the first solenoid valve to close and determines the adjustment opening of the second solenoid valve according to the overheating water temperature state.

[0071] When the water temperature reading reaches the preset value, it is determined that the engine is in a state of overheating water temperature, and the first solenoid valve is controlled to close and the adjustment opening of the second solenoid valve is determined according to the overheating water temperature state.

[0072] In the embodiment of the present application, the engine electronic control unit can determine whether the retarder needs to be cooled according to the obtained oil temperature reading and water temperature reading. If so, it further determines whether the water temperature reading reaches the preset value. If so, it is determined that the engine is in a state of overheating water temperature at this time, and it is necessary to control the valve openings of the first solenoid valve and the second solenoid valve according to this state to change the flow rate and velocity of the cooling water passing through the solenoid valve, so as to achieve the effect of cooling and lubricating the retarder and avoid excessive cold vehicle wear caused by non-lubrication of the retarder.

[0073] Please refer to Figure 3 , in the embodiment of the present application, another embodiment of the engine retarder cooling method includes:

[0074] 201. The engine electronic control unit obtains the oil temperature reading of the retarder within a preset time;

[0075] 202. The engine electronic control unit obtains the water temperature reading of the cooling water within a preset time;

[0076] Steps 201 to 202 in this embodiment are similar to steps 101 to 102 in the foregoing embodiment, and will not be elaborated here.

[0077] 203. The engine electronic control unit determines the water temperature reading of the cooling water required by the retarder according to the oil temperature reading;

[0078] 204. The engine electronic control unit determines whether the water temperature reading of the cooling water is lower than the water temperature reading. If so, step 205 is executed; if not, step 208 is executed;

[0079] The engine electronic control unit needs to determine whether the retarder needs to be cooled based on the oil temperature reading and the water temperature reading obtained within a preset time, and perform subsequent operations according to the judgment result. To determine whether the retarder needs to be cooled, it is necessary to first determine, based on the oil temperature reading, what the water temperature of the cooling water required for the retarder is for this oil temperature, and use this water temperature value as a reference value. After obtaining the reference value of the water temperature reading of the cooling water required for the retarder, compare it with the previously obtained water temperature reading. If the water temperature reading reaches or exceeds the reference value, it means that the retarder needs to be cooled, and step 205 is executed; if the water temperature reading does not reach the reference value, it means that the retarder does not need to be cooled, and step 208 is executed.

[0080] 205. The engine electronic control unit determines whether the water temperature reading reaches a preset value. If so, step 206 is executed; if not, step 207 is executed.

[0081] 206. The engine electronic control unit determines that the engine is in a state of high water temperature, and controls the first solenoid valve to close and determines the adjustment opening of the second solenoid valve according to the state of high water temperature.

[0082] Steps 205 to 206 in this embodiment are similar to steps 104 to 105 in the foregoing embodiment, and will not be elaborated here.

[0083] 207. The engine electronic control unit determines that the engine is in a state of not high water temperature, and controls the first solenoid valve to open and the second solenoid valve to close according to the state of not high water temperature.

[0084] When the engine electronic control unit determines that the water temperature reading does not reach the preset value, it determines that the engine is in a state of not high water temperature, and controls the first solenoid valve to open and the second solenoid valve to close according to the state of not high water temperature.

[0085] 208. The engine electronic control unit controls the first solenoid valve and the second solenoid valve to close.

[0086] When the engine electronic control unit determines that the cooling water temperature reading is not higher than the water temperature reading, it controls the first solenoid valve and the second solenoid valve to close.

[0087] The functions of the related devices mentioned in the engine retarder cooling method in the second aspect of the embodiments of the present application are the same as those of the related devices in the engine retarder cooling system in the first aspect of the embodiments of the present application, and will not be elaborated here.

[0088] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated here.

[0089] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0090] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Claims

1. An engine retarder cooling system, characterized in that, Including: A radiator, a retarder, a first solenoid valve, a second solenoid valve, an engine, a thermostat, a water pump, and an engine electronic control unit; The thermostat is connected to the engine, and the thermostat is used to control the cooling water and intake air temperature of the engine; The engine is connected to the water pump; One end of the radiator is connected to the water pump, and the other end is respectively connected to the thermostat and the retarder. The retarder is used to slow down the driving speed of the vehicle, and the water pump is used to pressurize the cooling water; One end of the first solenoid valve is connected to the retarder, and the other end is connected to the thermostat; One end of the second solenoid valve is connected to the retarder, and the other end is connected to the water pump. The first solenoid valve and the second solenoid valve are used to control the water inflow rate into the retarder; The engine electronic control unit is provided on the engine; When it is detected that the retarder needs to be cooled, the engine electronic control unit is used to control the valve states of the first solenoid valve and the second solenoid valve; An engine retarder cooling method, which is applied to an engine retarder cooling system. The engine retarder cooling method includes: Obtaining the oil temperature reading of the retarder within a preset time. The oil temperature reading is the oil temperature reading of the retarder sensed by an oil temperature sensor; Obtaining the water temperature reading of the cooling water within a preset time. The water temperature reading is the temperature reading of the cooling water passing through the engine sensed by a water temperature sensor; Judging whether the retarder needs to be cooled according to the oil temperature reading and the water temperature reading; If so, then judging whether the water temperature reading reaches a preset value; When the water temperature reading reaches the preset value, it is determined that the engine is in a state of too high water temperature, and the first solenoid valve is controlled to close and the adjustment opening of the second solenoid valve is determined according to the state of too high water temperature.

2. The cooling system according to claim 1, wherein The cooling system further includes: a water temperature sensor; The water temperature sensor is provided between the thermostat and the retarder, and the water temperature sensor is used to sense the temperature of the cooling water passing through the engine.

3. The cooling system according to claim 2, wherein, The cooling system further includes: an oil temperature sensor; The oil temperature sensor is provided on the retarder, and the oil temperature sensor is used to sense the oil temperature of the retarder.

4. The cooling system according to claim 3, characterized in that, The cooling system further includes: a retarder judgment module; The retarder judgment module is provided on the retarder, and the retarder judgment module is used to judge whether the retarder reaches the condition for needing to be cooled according to the oil temperature sensed by the oil temperature sensor, and send an electrical signal corresponding to the judgment result to the engine electronic control unit.

5. The cooling system according to claim 4, characterized in that, The retarder is respectively fixedly connected to the first solenoid valve and the second solenoid valve through fixed clamps.

6. The cooling system according to any one of claims 1 to 5, characterized in that, An airtight glue is coated at the joints of the retarder with the first solenoid valve and the second solenoid valve.

7. The cooling system according to claim 1, characterized in that, The judging whether the retarder needs to be cooled according to the oil temperature reading and the water temperature reading includes: Determining the water temperature reading of the cooling water required by the retarder according to the oil temperature reading; Judging whether the water temperature reading of the cooling water is lower than the water temperature reading. If so, it is determined that the retarder needs to be cooled; If not, it is determined that the retarder does not need to be cooled.

8. The cooling system according to claim 7, characterized in that, After determining whether the retarder needs to be cooled according to the oil temperature indication and the water temperature indication, the cooling method further includes: If not, control the first solenoid valve and the second solenoid valve to close.

9. The cooling system according to claim 8, wherein, After determining whether the water temperature indication reaches a preset value, the cooling method further includes: When the water temperature indication does not reach the preset value, determine that the engine is in a state of low water temperature, and control the first solenoid valve to open and the second solenoid valve to close according to the state of low water temperature.

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