Engine cooling system and engine high-temperature circulating water flow direction adjusting method

Abstract

The application provides an engine cooling system and an engine high-temperature circulating water flow direction adjusting method. The engine cooling system is provided with a first thermostat in parallel with a first intercooler in front of and behind the first intercooler in the engine high-temperature circulation, and a temperature control system is additionally arranged to obtain the gas temperature entering the first intercooler. The opening and closing of the second end and the third end of the first thermostat are controlled according to the gas temperature, the water flow direction through the cylinder head water jacket of the engine body in the cooling system is dynamically adjusted according to the intake temperature during the operation of the engine, the environmental adaptability of the engine is improved, and the temperature requirement of the cab heating air is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of engine control technology, in particular to an engine cooling system and an engine high-temperature circulating water flow direction adjusting method. BACKGROUND

[0002] The mine carrying truck exists long time idle condition, for the mine truck running in Siberia and other extremely cold environment, the engine long time idle no-load operation, the intake temperature is extremely low, the cold air cools the engine high-temperature water, causes the engine high-temperature cooling circulating water temperature to be lower, cannot satisfy the cab heater temperature requirement. SUMMARY

[0003] In view of the deficiencies in the prior art, the main purpose of the present application is to provide an engine cooling system and an engine high-temperature circulating water flow direction adjusting method, which is characterized in that the first thermostat is connected in parallel before and after the first intercooler of the engine high-temperature circulation, and a temperature control system is additionally provided for obtaining the gas temperature entering the first intercooler, and the opening and closing of the second end and the third end of the first thermostat are controlled according to the gas temperature, so as to dynamically adjust the water flow direction through the engine cylinder head water jacket in the cooling system during engine operation according to the intake temperature, improve the environmental adaptability of the engine, and meet the cab heater temperature requirement.

[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, an engine cooling system is provided.

[0005] The engine cooling system comprises a first water system, an air system and a temperature control system, wherein the first water system comprises:

[0006] An engine cylinder head water jacket;

[0007] A first intercooler having a liquid inlet channel and a liquid outlet channel;

[0008] A first thermostat for controlling whether the water flowing out of the engine cylinder head water jacket flows into the first intercooler; the first thermostat has a first end connected to the engine cylinder head water jacket, a second end connected to the liquid inlet channel of the first intercooler, and a third end connected to the liquid outlet channel of the first intercooler;

[0009] The air system comprises a first intercooler, and the first intercooler has an air inlet channel;

[0010] The temperature control system is used for obtaining the gas temperature entering the first intercooler, and controlling the opening and closing of the second end and the third end of the first thermostat according to the gas temperature.

[0011] Further, the temperature control system comprises a signal-connected temperature sensor and an electronic control unit, and the temperature sensor is used for obtaining the gas temperature.

[0012] The electronic control unit is connected to the first thermostat for controlling the switches of the second end and the third end of the first thermostat.

[0013] Further, when the gas temperature is greater than the preset temperature, the first end and the second end of the first thermostat are controlled to be turned on.

[0014] Further, when the gas temperature is less than or equal to the preset temperature, the first end and the third end of the first thermostat are controlled to be turned on.

[0015] Further, the first water system further comprises a first radiator, a first water pump, a heating system and a second thermostat.

[0016] The first radiator is connected to the first water pump, and the first water pump is connected to the engine body cylinder head water jacket.

[0017] The liquid outlet channel of the first intercooler is connected to the heating system, and the heating system is connected to the liquid outlet channel of the first radiator.

[0018] The second thermostat has a first end connected to the first radiator, a second end connected to the first water pump, and a third end connected to the liquid outlet channel of the first intercooler.

[0019] Further, the second water system further comprises a first radiator, a second water pump, a second intercooler, an oil cooler and a third thermostat connected in sequence.

[0020] The third thermostat has a first end connected to the first radiator, a second end connected to the oil cooler, and a third end connected to the second water pump.

[0021] Further, the temperature control system further comprises a second intercooler, the second intercooler has an air inlet channel and an air outlet channel, and the second intercooler is communicated with the first intercooler.

[0022] In order to achieve the above purpose, according to the second aspect of the present application, an engine high-temperature circulating water flow direction adjusting method is provided.

[0023] The engine high-temperature circulating water flow direction adjusting method is based on the above-mentioned engine cooling system; wherein,

[0024] The adjusting method comprises the following steps:

[0025] The temperature control system is used to obtain the gas temperature entering the first intercooler in real time.

[0026] According to the gas temperature, the switch actions of the second end and the third end of the first thermostat are controlled.

[0027] Further, when the gas temperature is greater than the preset temperature, the first end and the second end of the first thermostat are controlled to be conducted.

[0028] Further, when the gas temperature is less than or equal to the preset temperature, the first end and the third end of the first thermostat are controlled to be conducted.

[0029] Advantages of the present application:

[0030] The present application is provided with a first thermostat (or an electric control valve) in parallel with a first intercooler in a high-temperature cycle of an engine, a temperature sensor is additionally provided at an intake pipe of the first intercooler, and a temperature signal can be sent to an ECU.

[0031] In the present application, the engine cooling system can realize that the high-temperature circulating water does not pass through the first intercooler when the engine is running at an idle speed in an extremely cold environment, so that the high-temperature circulating water is prevented from being cooled to a lower temperature by cold air.

[0032] In the present application, the high-temperature circulating water passes through the first intercooler when the engine is running under a heavy load in a high-temperature environment, so that a large amount of heat of high-temperature intake air can be taken away through heat exchange, the heat taken away by low-temperature circulating water is reduced, the volume of a radiator is reduced, and the cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not intended to limit the scope of the present application. Moreover, like reference numerals designate like parts throughout the several views in the drawings. In the drawings:

[0034] Figure 1 The structure schematic diagram of the engine cooling system in the embodiment provided by the present application is shown in the figure;

[0035] Figure 2 The control flow chart of the engine high-temperature circulating water flow direction adjusting method in the embodiment provided by the present application is shown in the figure.

[0036] In the figure:

[0037] 1, engine cylinder head water jacket; 2, first intercooler; 3, first thermostat; 3-1, first end of the first thermostat; 3-2, second end of the first thermostat; 3-3, third end of the first thermostat; 4, temperature sensor; 5, electronic control unit; 6, first radiator; 7, first water pump; 8, heating system; 9, second thermostat; 9-1, first end of the second thermostat; 9-2, second end of the second thermostat; 9-3, third end of the second thermostat; 10, second water pump; 11, second intercooler; 12, oil cooler; 13, third thermostat; 13-1, first end of the third thermostat; 13-2, second end of the third thermostat; 13-3, third end of the third thermostat. DETAILED DESCRIPTION

[0038] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0039] Cabin heating: For the whole vehicle cabin heating, when the ambient temperature is low, the high-temperature water from the engine is used as a heat source to heat the air blown into the cabin, thereby achieving cabin temperature preservation.

[0040] In view of the current technology, the high-temperature circulating water of the engine always passes through the high-temperature stage of the intercooler to cool the high-temperature intake air. When the engine runs at idle for a long time in an extremely cold environment, due to the low speed of the supercharger, the temperature of the intake air after supercharging is close to the ambient temperature, which is relatively low and lower than the temperature of the high-temperature circulating water. Therefore, the high-temperature circulating water will be cooled to a lower temperature by the cold air, which will result in:

[0041] Low cabin heating temperature and low driver body temperature, affecting the driving experience;

[0042] Low water temperature at engine cylinder sleeve and other positions, poor engine economy, and reduced engine life.

[0043] Therefore, the present application provides an engine cooling system which can avoid the cold air from cooling the high-temperature water to a lower temperature, and ensure that the cabin heating temperature and the high-temperature water temperature passing through the engine cylinder sleeve are within a suitable range.

[0044] As shown in Figure 1 the engine cooling system in the present application includes a first water system, a second water system, an air system, and a temperature control system. The water temperature in the first water system is higher than that in the second water system, i.e., the first water system can be understood as a high-temperature water system, and the second water system can be understood as a low-temperature water system.

[0045] The first water system comprises an engine block cylinder head water jacket 1, a first intercooler 2, and a first thermostat 3. The first intercooler 2 has an inlet channel and an outlet channel. The first thermostat 3 is used to control whether the water flowing out of the engine block cylinder head water jacket 1 flows into the first intercooler 2, or in other words, whether the water flowing out of the engine block cylinder head water jacket 1 enters the first intercooler 2 through the inlet channel of the first intercooler 2 and then flows out through the outlet channel of the first intercooler 2. Specifically, the first thermostat 3 has a first end 3-1 connected to the engine block cylinder head water jacket 1, a second end 3-2 connected to the inlet channel of the first intercooler 2, and a third end 3-3 connected to the outlet channel of the first intercooler 3. When the second end 3-2 of the first thermostat 3 is controlled to be closed, the first end 3-1 and the third end 3-3 of the first thermostat 3 are connected, and the water flowing out of the engine block cylinder head water jacket 1 does not pass through the first intercooler 2. When the third end 3-3 of the first thermostat 3 is controlled to be closed, the first end 3-1 and the second end 3-2 of the first thermostat 3 are connected, and the water flowing out of the engine block cylinder head water jacket 1 passes through the first intercooler 2.

[0046] As shown in Figure 1 The temperature control system is used to obtain the gas temperature entering the first intercooler 2 and control the switching of the second end 3-2 and the third end 3-3 of the first thermostat 3 according to the gas temperature. Specifically, when the gas temperature is greater than a preset temperature, the first end 3-1 and the second end 3-2 of the first thermostat 3 are controlled to be conductive, the water flowing out of the engine block cylinder head water jacket 1 passes through the first intercooler 2, and the first intercooler 2 is realized to run for a long time at idle speed in an extremely cold environment temperature. When the gas temperature is less than or equal to the preset temperature, the first end 3-1 and the third end 3-3 of the first thermostat 3 are controlled to be conductive, the water flowing out of the engine block cylinder head water jacket 1 does not pass through the first intercooler 2, cold air is prevented from cooling the high-temperature water to a lower temperature, and the temperature of the cab warm air and the high-temperature water passing through the cylinder sleeve is ensured to be in a suitable range.

[0047] As shown in Figure 1 The temperature control system comprises a signal-connected temperature sensor 4 and an electronic control unit 5. The temperature sensor 4 is used to obtain the gas temperature. The electronic control unit 5 is connected to the first thermostat 3 and is used to control the switching of the second end 3-2 and the third end 3-3 of the first thermostat 3.

[0048] As an embodiment of the present application, the temperature sensor 4 is used to obtain the gas temperature entering the first intercooler 2 and send a temperature signal to the electronic control unit 5 (ECU). The ECU controls the action of the first thermostat 3 according to the temperature signal.

[0049] As shown in Figure 2As shown, when the gas temperature is greater than the preset temperature, such as when the gas temperature > 0℃, the first end 3-1 and the second end 3-2 of the first thermostat 3 are controlled to be turned on, and the water flowing out of the engine body cylinder head water jacket 1 passes through the first intercooler 2, so that the first intercooler 2 can be operated for a long time at idle speed in an extremely cold environment.

[0050] As shown, Figure 2 As shown, when the gas temperature is less than or equal to the preset temperature, such as when the gas temperature ≤ 0℃, the first end 3-1 and the third end 3-3 of the first thermostat 3 are controlled to be turned on, so that the water flowing out of the engine body cylinder head water jacket 1 is forced not to pass through the first intercooler 2, thereby avoiding that the cold air cools the high-temperature water to a lower temperature, and ensuring that the temperature of the cab heating air and the high-temperature water passing through the cylinder jacket are in a suitable range.

[0051] As shown, Figure 1 As shown, the gas path system includes the first intercooler 2 and the second intercooler 11, the second intercooler 11 has an air inlet channel and an air outlet channel, the first intercooler 2 has an air inlet channel and an air outlet channel, and the air outlet channel of the first intercooler 2 is in communication with the air inlet channel of the second intercooler 11.

[0052] It is worth mentioning that the two-stage cooling intercooler in the present application includes the first intercooler 2 and the second intercooler 11, wherein the first intercooler 2 is a high-temperature stage intercooler, and the second intercooler 11 is a low-temperature stage intercooler.

[0053] As shown, Figure 1 As shown, the first water path system further includes a first radiator 6 and a first water pump 7; the first radiator 6 is connected to the first water pump 7, the first water pump 7 is used to extract the water in the internal circulation, the first water pump 7 is connected to the engine body cylinder head water jacket 1, and the water extracted by the first water pump 7 is burned in the engine body cylinder head water jacket 1, so that the water temperature increases rapidly, and therefore the water passing through the engine body cylinder head water jacket 1 is heated in a short time. When the air enters the first intercooler 2 through the air inlet channel, the temperature of the entering air is very low, which will cool the high-temperature water in the first intercooler 2. Therefore, whether the water passing through the engine body cylinder head water jacket 1 flows through the first intercooler 2 is controlled by the first thermostat 3.

[0054] As shown, Figure 1 As shown, the first water path system further includes a heating system 8, the liquid outlet channel of the first intercooler 2 is connected to the heating system 8, which is used to provide heating air for the cab; and the heating system 8 is connected to the liquid outlet channel of the first radiator 6.

[0055] As shown, Figure 1 As shown, the first water path system further includes a second thermostat 9, the second thermostat 9 has a first end 9-1 connected to the first radiator 6, a second end 9-2 connected to the first water pump 7, and a third end 9-3 connected to the liquid outlet channel of the first intercooler 2.

[0056] As an embodiment of the present application, the first end 9-1 and the third end 9-3 of the second thermostat 9 are controlled to be open, at this time, the water flowing through the outlet channel of the first intercooler 2 flows through the first radiator 6, and then enters the engine body head water jacket 1 through the first water pump 7.

[0057] As an embodiment of the present application, the second end 9-2 and the third end 9-3 of the second thermostat 9 are controlled to be open, at this time, the water flowing through the outlet channel of the first intercooler 2 does not flow through the first radiator 6, and directly enters the engine body head water jacket 1 through the first water pump 7.

[0058] As shown in Figure 1 , the second water system includes the first radiator 6, the second water pump 10, the second intercooler 11, the oil cooler 12 and the third thermostat 13 connected in sequence; wherein the third thermostat 13 has a first end 13-1 connected to the first radiator 6, a second end 13-2 connected to the oil cooler 12, and a third end 13-3 connected to the second water pump 10.

[0059] As an embodiment of the present application, the first end 13-1 and the second end 13-2 of the third thermostat 13 are controlled to be open, at this time, the water passing through the oil cooler 12 directly enters the first radiator 6.

[0060] As an embodiment of the present application, the second end and the third end of the third thermostat 13 are controlled to be open, at this time, the water passing through the oil cooler 12 enters the second intercooler 11 through the second water pump 10.

[0061] In the embodiment of the present application, the first water pump 7 is a high-temperature water pump, and the second water pump 10 is a low-temperature water pump.

[0062] In the embodiment of the present application, the first thermostat 3 is an electric temperature control valve. Of course, it can also be other forms of electric control valve, which is not specifically limited.

[0063] According to the specific embodiment of the present application, an engine high-temperature circulating water flow direction adjusting method is also provided, which is based on the above-mentioned engine cooling system and applied to the control of the temperature control system.

[0064] As shown in Figure 2 , the engine high-temperature circulating water flow direction adjusting method of the present application includes the following steps:

[0065] The temperature control system is used to obtain the temperature of the gas entering the first intercooler 2 in real time.

[0066] In the embodiment of the present application, the temperature sensor 4 is used to obtain the temperature of the gas entering the first intercooler 2 in real time, and the temperature signal is fed back to the electronic control unit 5.

[0067] The electronic control unit 5 controls the switching actions of the second end 3-2 and the third end 3-3 of the first thermostat 3 according to the temperature signal, so that the flow direction of the water flowing out of the engine cylinder head water jacket 1 is dynamically adjusted according to the intake air temperature during the engine operation process:

[0068] When the gas temperature is greater than the preset temperature, the first end 3-1 and the second end 3-2 of the first thermostat 3 are controlled to be turned on;

[0069] When the gas temperature is less than or equal to the preset temperature, the first end 3-1 and the third end 3-3 of the first thermostat 3 are controlled to be turned on.

[0070] In the embodiment of the present application, the preset temperature can be set to 0℃, and of course the preset temperature can be designed according to the actual situation, and is not limited specifically.

[0071] It should be noted that the terms "comprising" and any variations thereof in the specification and claims of the present application are intended to cover the non-exclusive inclusion, for example, a series of components includes components that are not necessarily limited to those clearly listed, but can include other components that are not clearly listed or inherent to the components.

[0072] In the present application, the terms "upper", "lower", "bottom", "top", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0073] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain attachment relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0074] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0075] In addition, the technical solutions of various embodiments can be combined with each other, but must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0076] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical scope disclosed by the present application, which can be easily thought by those skilled in the art, should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An engine cooling system, characterized in that, It includes a first water system, a second water system, a gas system, and a temperature control system. The first water system is a high-temperature water system, and the second water system is a low-temperature water system. The first water system includes: Engine block cylinder head water jacket; The first intercooler has a liquid inlet channel and a liquid outlet channel; The first thermostat is used to control whether the water flowing out of the engine block cylinder head water jacket flows into the first intercooler; the first thermostat has a first end connected to the engine block cylinder head water jacket, a second end connected to the liquid inlet channel of the first intercooler, and a third end connected to the liquid outlet channel of the first intercooler. The air circuit system includes a first intercooler, which has an air intake passage; The temperature control system is used to obtain the gas temperature entering the first intercooler and control the switching of the second and third terminals of the first thermostat according to the gas temperature; when the gas temperature is greater than a preset temperature, the first and second terminals of the first thermostat are controlled to be open; when the gas temperature is less than or equal to the preset temperature, the first and third terminals of the first thermostat are controlled to be open. The first water system further includes a first radiator, a first water pump, a heating system, and a second thermostat; the first radiator is connected to the first water pump, and the first water pump is connected to the water jacket of the engine block cylinder head; the outlet channel of the first intercooler is connected to the heating system, and the heating system is connected to the outlet channel of the first radiator; the second thermostat has a first end connected to the first radiator, a second end connected to the first water pump, and a third end connected to the outlet channel of the first intercooler.

2. The engine cooling system as described in claim 1, characterized in that, The temperature control system includes a temperature sensor and an electronic control unit connected by a signal, wherein the temperature sensor is used to acquire the gas temperature; The electronic control unit is connected to the first thermostat and is used to control the switching of the second and third terminals of the first thermostat.

3. The engine cooling system as described in claim 1, characterized in that, The second water system includes a first radiator, a second water pump, a second intercooler, an oil cooler, and a third thermostat connected in sequence. The third thermostat has a first end connected to the first radiator, a second end connected to the oil cooler, and a third end connected to the second water pump.

4. The engine cooling system as described in claim 3, characterized in that, The temperature control system also includes a second intercooler, which has an air inlet channel and an air outlet channel, and is connected to the first intercooler.

5. A method for adjusting the flow direction of high-temperature circulating water in an engine, characterized in that, It is based on the engine cooling system according to any one of claims 1-4; wherein, The adjustment method includes the following steps: A temperature control system is used to obtain the gas temperature entering the first intercooler in real time; The switching action of the second and third terminals of the first thermostat is controlled according to the gas temperature.

6. The method for adjusting the flow direction of high-temperature circulating water in an engine as described in claim 5, characterized in that, When the gas temperature is greater than the preset temperature, the first and second terminals of the first thermostat are switched on.

7. The method for adjusting the flow direction of high-temperature circulating water in an engine as described in claim 5, characterized in that, When the gas temperature is less than or equal to a preset temperature, the first and third terminals of the first thermostat are switched on.

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