Engine cylinder cover, engine cooling method and engine

Abstract

The invention relates to an engine cylinder cover, an engine cooling method and an engine. The engine cylinder cover comprises an upper-layer water jacket, a lower-layer water jacket and a lower-layer water jacket, a lower water jacket; the first pressure valve is arranged at the communication part of the upper-layer water jacket and the lower-layer water jacket; and the second pressure valve is arranged at the communication part of the lower-layer water jacket and the cylinder body water jacket of the engine. By the adoption of the engine cylinder cover, the cooling structure can be simplified, energy consumption is reduced, and cooling efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of engine cooling, and in particular to an engine cylinder head, an engine cooling method and an engine. Background Art

[0002] With the development of engine technology, a large amount of heat will be generated during the operation of the engine. In order to prevent overheating from causing damage to engine components and performance degradation and to optimize emission performance, the engine needs to be effectively cooled.

[0003] In the traditional method, a cooling system arranged in series is set in the engine cylinder head so that the coolant flows through the cylinder body, cylinder head, engine cooler and other accessories in sequence, or multiple shunt pipes, thermostats and shunt switch mechanisms are set in the engine cylinder head to achieve effective cooling of the engine.

[0004] However, conventional engine cooling methods have low cooling efficiency. Summary of the invention

[0005] Based on this, it is necessary to provide an engine cylinder head, an engine cooling method and an engine that can improve the cooling efficiency in order to solve the problem of low engine cooling efficiency in the prior art.

[0006] In a first aspect, the present application provides an engine cylinder head, which adopts the following technical solution:

[0007] An engine cylinder head, comprising:

[0008] Upper water jacket; Lower water jacket;

[0009] A first pressure valve is arranged at the connection point between the upper water jacket and the lower water jacket;

[0010] The second pressure valve is arranged at the connecting point between the lower water jacket and the cylinder water jacket of the engine.

[0011] In one embodiment, the provided engine cylinder head further comprises:

[0012] The middle partition is arranged between the upper water jacket and the lower water jacket, and a middle through hole is opened on the middle partition.

[0013] In one of the embodiments, a first pressure valve in a cylinder head of an engine is provided, comprising: a first elastic member abutting against a middle through hole on a middle partition plate via a first water baffle plate.

[0014] In one of the embodiments, the first pressure valve in the engine cylinder head provided further includes: a first connecting portion, one end of the first connecting portion is connected to the first elastic member, and the other end of the first connecting portion is connected to the top plate of the engine cylinder head.

[0015] In one of the embodiments, the first connection portion in the engine cylinder head is provided to be interference fit with the top plate.

[0016] In one embodiment, a second pressure valve in a cylinder head of an engine is provided, comprising:

[0017] A second elastic member, one end of the second elastic member is connected to the bottom plate of the engine cylinder head through a second connecting portion, and the other end of the second elastic member is abutted against the bottom limiting platform of the bottom plate through a second water baffle.

[0018] In one of the embodiments, the provided engine cylinder head further includes: a water pump, wherein a water outlet of the water pump is connected to a water inlet of the lower water jacket.

[0019] In one embodiment, the opening pressure of the first pressure valve in the cylinder head of the engine is provided to be lower than the opening pressure of the second pressure valve.

[0020] In a second aspect, the present application provides an engine cooling method, which is applied to the engine cylinder head of the first aspect. The engine cooling method adopts the following steps:

[0021] Obtain the thermal load information corresponding to the engine;

[0022] When the heat load information is low load, the coolant pressure is controlled to be less than or equal to the opening pressure corresponding to the first pressure valve;

[0023] When the heat load information indicates a high load, the coolant pressure is controlled to be greater than the opening pressure corresponding to the first pressure valve and less than or equal to the opening pressure corresponding to the second pressure valve;

[0024] When the heat load information indicates a high load, the coolant pressure is controlled to be greater than the opening pressure corresponding to the second pressure valve.

[0025] In a third aspect, the present application provides an engine, comprising the engine cylinder head of the first aspect.

[0026] The above-mentioned engine cylinder head, engine cooling method and engine, in one aspect, provide an engine cylinder head comprising: an upper water jacket; a lower water jacket; a first pressure valve, arranged at the connection between the upper water jacket and the lower water jacket; a second pressure valve, arranged at the connection between the lower water jacket and the engine cylinder body water jacket. In the present application, the engine cylinder head is divided into multiple cooling areas by the first pressure valve and the second pressure valve, simplifying the cooling structure; under any engine operating condition, all coolant always flows through the nose bridge area with the greatest heat dissipation demand, and for areas with low cooling demand, the opening and closing states of the first pressure valve and the second pressure valve are controlled to control the flow of coolant in the upper water jacket and the cylinder body water jacket, so as to achieve on-demand distribution of coolant, which can reduce energy consumption and improve cooling efficiency while ensuring that the combustion chamber, cylinder wall and nose bridge area are effectively cooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is an exploded view of the structure of an engine cylinder head in one embodiment;

[0028] FIG2 is a schematic cross-sectional view of an engine cylinder head in one embodiment;

[0029] FIG3 is a schematic cross-sectional view of the upper water jacket in one embodiment;

[0030] FIG4 is a schematic cross-sectional view of the lower water jacket in one embodiment;

[0031] FIG5 is a schematic structural diagram of a first pressure valve in one embodiment;

[0032] FIG6 is a schematic structural diagram of a second pressure valve in one embodiment;

[0033] FIG7 is a schematic diagram of the circulation of the cooling liquid in one embodiment;

[0034] FIG8 is a schematic flow chart of steps of an engine cooling method in one embodiment;

[0035] Notes on the attached drawings:

[0036] 1. Upper water jacket; 2. Lower water jacket; 21. Coolant inlet; 22. Inlet side through hole; 23. Exhaust side through hole; 3. First pressure valve; 31. First elastic member; 32. First water baffle; 33. First connecting part; 4. Second pressure valve; 41. Second elastic member; 42. Second water baffle; 43. Second connecting part; 5. Middle partition; 51. Middle through hole; 52. Middle limiting platform; 6. Top plate; 7. Bottom plate; 71. Bottom limiting platform; 72. Bottom through hole. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] The embodiments of the present application are further described in detail below in conjunction with Figures 1-8.

[0044] The engine cylinder head provided in an embodiment of the present application is applied to an engine cylinder with a layered water jacket. Referring to Figures 1 to 4, the engine cylinder head provided in an embodiment of the present application includes: an upper water jacket 1; a lower water jacket 2; a first pressure valve 3, which is arranged at the connection point between the upper water jacket 1 and the lower water jacket 2; and a second pressure valve 4, which is arranged at the connection point between the lower water jacket 2 and the cylinder body water jacket of the engine.

[0045] The upper water jacket 1 is located at the top of the entire cylinder head, usually surrounding the top of the cylinder to ensure that the cylinder head, combustion chamber, valve and other components are effectively cooled; the lower water jacket 2 is located at the bottom of the entire cylinder head, surrounding the lower part of the combustion chamber and the cylinder wall, and is used to cool the nose bridge area and the lower part around the combustion chamber. The nose bridge area is a narrow area between the cylinder block and the cylinder head, located near the combustion chamber, spark plug or fuel injector. It has a compact structure and is close to the high-temperature combustion chamber. It is prone to high-temperature accumulation. It is the part of the whole machine that requires the most coolant and needs to be effectively cooled.

[0046] Among them, the cylinder block water jacket includes an intake side water jacket and an exhaust side water jacket. The intake side water jacket is arranged on the intake side of the cylinder block, surrounding the intake passage to prevent excessive temperature from affecting the air density and combustion efficiency; the exhaust side water jacket is located on the exhaust side of the cylinder block, surrounding the exhaust passage to help absorb the heat during the exhaust process and prevent excessive temperature.

[0047] The lower water jacket 2 is provided with a coolant inlet 21 near the bottom of the cylinder head, and the part near the intake side water jacket is provided with an intake side through hole 22 connected to the intake side water jacket; the part near the exhaust side water jacket is provided with an exhaust side through hole 23 connected to the exhaust side water jacket. The upper water jacket 1, the lower water jacket 2, the intake side water jacket and the exhaust side water jacket are connected by a coolant pipe to form a closed circulation loop. The coolant flows through each water jacket and the coolant pipe, absorbs heat and flows back to the radiator for cooling, together forming a cooling system for the engine cylinder to ensure that the engine runs at the optimal temperature.

[0048] In a possible implementation, the lower water jacket 2 is connected to the upper water jacket 1 through the first pressure valve 3, the lower water jacket 2 is connected to the intake side water jacket through the second pressure valve 4, and the water outlet of the lower water jacket 2 is connected to the exhaust side water jacket. In the process of cooling the engine, the initial states of the first pressure valve 3 and the second pressure valve 4 are both closed, the upper water jacket 1 and the lower water jacket 2 are isolated, and the coolant can only enter the lower water jacket 2 to cool the nose bridge area of ​​the engine, and then flow through the exhaust side water jacket into the radiator; adjust the pressure of the coolant, open the first pressure valve 3, and keep the second pressure valve 4 closed, the coolant enters the upper water jacket 1 from the lower water jacket 2, and cools the nose bridge area and upper area of ​​the lower part of the engine at the same time, and then flows into the radiator; further adjust the pressure of the coolant, open the first pressure valve 3 and the second pressure valve 4, the coolant enters the intake side water jacket, and then flows into the radiator, cooling the nose bridge area, upper area, intake channel and outlet channel of the lower part of the engine.

[0049] In a possible implementation, the engine cylinder head further includes: a top plate 6 and a bottom plate 7. The top plate 6 is the upper structure of the cylinder head, which is mainly connected to the valve mechanism, and can be designed with an interface or flange surface for connecting the intake manifold and the exhaust manifold, and is connected to the intake system and exhaust system of the engine to ensure that air or mixed gas enters the combustion chamber and exhausts the exhaust gas generated by combustion. The top plate 6 can also be provided with a threaded hole, which can be opened just above the cylinder, for installing a spark plug to ensure that the mixed gas in the combustion chamber can be evenly ignited when the spark plug is ignited, or for installing a fuel injector to spray fuel into the combustion chamber for combustion.

[0050] The bottom plate 7 is the lower structure of the cylinder head, and the bottom plate 7 and the top of the piston form a closed structure of the combustion chamber. A valve seat may be provided on the bottom plate 7 for mounting and fixing the intake valve and the exhaust valve. The lower surface of the bottom plate 7 may be connected to the cylinder body through a cylinder head gasket, and the cylinder head gasket is used to seal the combustion chamber, the coolant channel and the oil channel to prevent the combustion gas, coolant or oil from leaking between the cylinder head and the cylinder body. Optionally, the top plate 6 and the bottom plate 7 may be integrally formed.

[0051] The above-mentioned engine cylinder head comprises: an upper water jacket 1; a lower water jacket 2; a first pressure valve 3, which is arranged at the connection point between the upper water jacket 1 and the lower water jacket 2; and a second pressure valve 4, which is arranged at the connection point between the lower water jacket 2 and the cylinder water jacket of the engine. In this embodiment, the engine cylinder head is divided into multiple cooling areas by the first pressure valve 3 and the second pressure valve 4, simplifying the cooling structure; under any engine operating condition, all coolant always flows through the nose bridge area with the greatest heat dissipation demand, and for areas with low cooling demand, the opening and closing states of the first pressure valve 3 and the second pressure valve 4 are controlled to control the flow of coolant in the upper water jacket 1 and the cylinder water jacket, so as to achieve on-demand distribution of coolant, which can reduce energy consumption and improve cooling efficiency while ensuring that the combustion chamber, cylinder wall and nose bridge area are effectively cooled.

[0052] Referring to FIGS. 1 to 4 , the engine cylinder head provided in one embodiment of the present application further includes: a middle partition plate 5, which is arranged between the upper water jacket 1 and the lower water jacket 2, and a middle through hole 51 is provided on the middle partition plate 5. By controlling the opening and closing state of the middle through hole 51, the upper water jacket 1 and the lower water jacket 2 can be controlled to be connected or disconnected. Optionally, the middle through hole 51 is provided on a middle limit platform 52 of the middle partition plate 5.

[0053] Referring to FIG. 5 , the first pressure valve 3 in the cylinder head of the engine provided in one embodiment of the present application comprises: a first elastic member 31, one end of the first elastic member 31 abuts against the middle through hole 51 on the middle partition 5 through the first water baffle plate 32. In the process of cooling the engine, when the coolant pressure Px is less than or equal to the opening pressure P1 of the first pressure valve 3, the first elastic member 31 abuts against the middle through hole 51 on the middle partition 5 through the first water baffle plate 32, the first pressure valve 3 is in a cut-off state, the coolant flows through the lower water jacket 2, and cannot enter the upper water jacket 1 through the middle partition plate 5 and the first pressure valve 3; when the coolant pressure Px is greater than the opening pressure P1 of the first pressure valve 3, the first elastic member 31 and the first water baffle plate 32 are separated from the middle through hole 51 on the middle partition plate 5, the first pressure valve 3 is in an open state, the upper water jacket 1 and the lower water jacket 2 are connected, and the coolant can enter the upper water jacket 1 through the middle partition plate 5 and the first pressure valve 3.

[0054] In a possible implementation manner, the first elastic member 31 is a spring.

[0055] In a possible implementation, the first pressure valve 3 further includes a first connection portion 33, one end of the first connection portion 33 is connected to the first elastic member 31, and the other end is connected to the top plate 6 of the engine cylinder head. Optionally, the first connection portion 33 is interference fit with the top plate 6, or the first connection portion 33 is connected to the threaded hole on the top plate 6 by bolts.

[0056] Optionally, the first pressure valve 3 may further include a guide member, which is sleeved on the outside of the first elastic member 31 or penetrated inside the first elastic member 31, and is used to limit the movement direction of the first elastic member 31. Optionally, the first pressure valve 3 may further include a sealing ring, which is sleeved on the first water baffle 32, and is used to prevent leakage of the coolant.

[0057] FIG6 shows a schematic diagram of the structure of the second pressure valve 4 in an embodiment of the present application. Referring to FIG6, the second pressure valve 4 in the engine cylinder head provided in an embodiment of the present application includes: a second elastic member 41, one end of the second elastic member 41 is connected to the bottom plate 7 of the engine cylinder head through a second connecting portion 43, and the other end of the second elastic member 41 is abutted against the bottom limiting platform 71 of the bottom plate 7 and the bottom through hole 72 opened on the bottom limiting platform 71 through a second water retaining plate 42. During the process of cooling the engine, when the coolant pressure Px is less than or equal to the opening pressure P2 of the second pressure valve 4, the second elastic member 41 abuts against the bottom limit platform 71 through the second water baffle 42, the second pressure valve 4 is in a cut-off state, and the coolant cannot enter the intake side water jacket through the second pressure valve 4; when the coolant pressure Px is greater than the opening pressure P2 of the second pressure valve 4, the second elastic member 41 and the second water baffle 42 are separated from the bottom limit platform 71, the second pressure valve 4 is in an open state, the lower water jacket 2 and the intake side water jacket are connected, and the coolant in the lower water jacket 2 can enter the intake side water jacket through the second pressure valve 4. In a possible embodiment, the second elastic member 41 is a spring.

[0058] In a possible implementation, the engine cylinder head further includes: a water pump, the water outlet of the water pump is connected to the water inlet of the lower water jacket 2. The water pump converts electrical energy or other energy sources into mechanical energy, generates a pressure difference, and pumps water from the water inlet to the water outlet to drive the coolant to flow. By adjusting parameters such as the rotation speed and flow rate of the water pump, the pressure Px of the coolant output by the water pump is controlled. In a possible implementation, under different heat load conditions, the water pump is used to control the coolant to operate at the lowest water flow rate while meeting a specific pressure, which can save 10% to 30% of the water pump power consumption and achieve high efficiency and energy saving.

[0059] In a possible implementation, the opening pressure P1 of the first pressure valve 3 is less than the opening pressure P2 of the second pressure valve 4. In the process of cooling the engine, the coolant flows from the water outlet of the water pump through the water inlet of the lower water jacket 2 and enters the lower water jacket 2. When the engine is started and the heat load is small, the bottom nose bridge area needs to be cooled. The coolant water pressure Px is controlled so that Px < P1 and Px < P2. The first pressure valve 3 and the second pressure valve 4 are both closed. The coolant flows through the lower water jacket 2 to cool the nose bridge area. The coolant after absorbing heat flows out of the lower water jacket 2 from the water outlet and enters the exhaust side water jacket to cool the high-temperature exhaust side cylinder liner. As the heat load increases, when the engine heat load is high and the upper part of the cylinder head needs to be cooled, the water pressure Px of the lower water jacket 2 is controlled so that P1 < Px < P2. The first pressure valve 3 is opened and the second pressure valve 4 is closed. Part of the coolant enters the upper water jacket 1 through the first pressure valve 3 to cool the valve guide area. The heat load continues to increase. When it is necessary to cool the intake side cylinder liner, Px>P2, the first pressure valve 3 and the second pressure valve 4 are both opened, and part of the coolant enters the intake side water jacket through the second pressure valve 4 to cool the intake side cylinder liner. Specifically, after all the coolant flows through the nose bridge area, about 30% of the coolant cools the upper half of the cylinder head, and the remaining 70% of the coolant cools the cylinder liner.

[0060] In a possible implementation, the water outlets of the upper water jacket 1, the air intake side water jacket, and the air outlet side water jacket are respectively connected to the cylinder water collector to collect the coolant after absorbing heat. The cylinder water collector is connected to the machine cooler, and the collected coolant is used to cool the machine cooler, forming a coolant circuit that is connected in series as a whole and in parallel in parts, so as to achieve precise cooling of various parts and further improve the utilization efficiency of the coolant.

[0061] In a possible implementation, the coolant flowing through the machine cooler flows into the radiator, and after the radiator dissipates heat and cools down, flows into the water inlet of the water pump to achieve circulating cooling.

[0062] In this embodiment, during the process of cooling the engine, by controlling the pressure of the coolant, all low-temperature coolant can flow through the nose bridge area of ​​the cylinder head, ensuring that the nose bridge area is fully cooled; under low heat load conditions, by shutting off the first pressure valve 3 and the second pressure valve 4, the upper water jacket 1 and the intake side water jacket are blocked, and the effective volume of the coolant is reduced by about 20%, thereby achieving rapid warm-up while effectively cooling the nose bridge area; under high load conditions, the lower water jacket 2, the upper water jacket 1 and the intake side water jacket are connected to achieve a variable volume water jacket and improve cooling efficiency.

[0063] FIG7 shows a schematic diagram of the circulation of the coolant in an embodiment of the present application. Referring to FIG1 to FIG7 , an engine cylinder head provided in an embodiment of the present application comprises: an upper water jacket 1, a lower water jacket 2, and:

[0064] The middle partition plate 5 is arranged between the upper water jacket 1 and the lower water jacket 2 , and a middle through hole 51 is opened in the middle partition plate 5 .

[0065] The first pressure valve 3 is arranged at the connecting point of the upper water jacket 1 and the lower water jacket 2, and the first pressure valve 3 includes: a first elastic member 31, which is abutted against the middle through hole 51 on the middle partition plate 5 through a first water baffle plate 32; a first connecting portion 33, one end of the first connecting portion 33 is connected to the first elastic member 31, and the other end is connected to the top plate 6 of the engine cylinder head, and the first connecting portion 33 is interference fit with the top plate 6.

[0066] The second pressure valve 4 is arranged at the connection point between the lower water jacket 2 and the cylinder water jacket of the engine, and the second pressure valve 4 includes: a second elastic member 41, one end of the second elastic member 41 is connected to the bottom plate 7 of the engine cylinder head through a second connecting portion 43, and the other end of the second elastic member 41 is abutted against the bottom limit platform 71 of the bottom plate 7 through a second water baffle 42. The opening pressure of the first pressure valve 3 is less than the opening pressure of the second pressure valve 4.

[0067] A water pump, the water outlet of the water pump is connected to the water inlet of the lower water jacket 2.

[0068] The cylinder water collection channel, the water outlets of the upper water jacket 1, the air intake side water jacket and the air outlet side water jacket are respectively connected to the cylinder water collection channel to collect the coolant after absorbing heat. Among them, the cylinder water collection channel is connected to the machine cooler, and the collected coolant is used to cool the machine cooler. The coolant flowing through the machine cooler flows into the radiator, and after the radiator dissipates heat and cools down, it flows into the water inlet of the water pump to achieve circulating cooling.

[0069] FIG8 is a flow chart showing the steps of an engine cooling method provided in an embodiment of the present application. As shown in FIG8 , the engine cooling method provided in an embodiment of the present application includes the following steps 802 to 808. Among them:

[0070] Step 802, obtaining the thermal load information corresponding to the engine.

[0071] Step 804 , when the heat load information is low load, control the coolant pressure to be less than or equal to the opening pressure corresponding to the first pressure valve 3 .

[0072] Step 806 , when the heat load information indicates a relatively high load, the coolant pressure is controlled to be greater than the opening pressure corresponding to the first pressure valve 3 , and less than or equal to the opening pressure corresponding to the second pressure valve 4 .

[0073] Step 808 , when the heat load information indicates a high load, controlling the coolant pressure to be greater than the opening pressure corresponding to the second pressure valve 4 .

[0074] The opening pressure of the first pressure valve 3 is smaller than the opening pressure of the second pressure valve 4 .

[0075] Optionally, the load type corresponding to the heat load information may be determined to be low load, relatively high load or high load through a preset mapping relationship between the heat load information and the load type.

[0076] An engine is provided in one embodiment of the present application, comprising an engine cylinder head improved as in the above embodiment.

[0077] In one embodiment, the engine cylinder head comprises: an upper water jacket 1, a lower water jacket 2, and:

[0078] The middle partition plate 5 is arranged between the upper water jacket 1 and the lower water jacket 2 , and a middle through hole 51 is opened in the middle partition plate 5 .

[0079] The first pressure valve 3 is arranged at the connecting point of the upper water jacket 1 and the lower water jacket 2, and the first pressure valve 3 includes: a first elastic member 31, which is abutted against the middle through hole 51 on the middle partition plate 5 through a first water baffle plate 32; a first connecting portion 33, one end of the first connecting portion 33 is connected to the first elastic member 31, and the other end is connected to the top plate 6 of the engine cylinder head, and the first connecting portion 33 is interference fit with the top plate 6.

[0080] The second pressure valve 4 is arranged at the connection point between the lower water jacket 2 and the cylinder water jacket of the engine. The second pressure valve 4 includes: a second elastic member 41, one end of the second elastic member 41 is connected to the bottom plate 7 of the engine cylinder head through a second connecting portion 43, and the other end of the second elastic member 41 is abutted against the bottom limiting platform 71 of the bottom plate 7 through a second water baffle plate 42.

[0081] A water pump, the water outlet of the water pump is connected to the water inlet of the lower water jacket 2.

[0082] The opening pressure of the first pressure valve 3 is smaller than the opening pressure of the second pressure valve 4 .

[0083] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0084] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An engine cylinder head, characterized in that: The engine cylinder head comprises: Upper water jacket; Lower water jacket; A first pressure valve is arranged at the connection point between the upper water jacket and the lower water jacket; The second pressure valve is arranged at the connecting point between the lower water jacket and the cylinder water jacket of the engine.

2. The engine cylinder head according to claim 1, characterized in that: The engine cylinder head also includes: The middle partition is arranged between the upper water jacket and the lower water jacket, and a middle through hole is opened on the middle partition.

3. The engine cylinder head according to claim 2, characterized in that: The first pressure valve comprises: a first elastic member abutting against the middle through hole on the middle partition plate through a first water baffle plate.

4. The engine cylinder head according to claim 3, characterized in that: The first pressure valve further includes: a first connecting portion, one end of which is connected to the first elastic member, and the other end of which is connected to the top plate of the engine cylinder head.

5. The engine cylinder head according to claim 4, characterized in that: The first connecting portion is interference fit with the top plate.

6. The engine cylinder head according to claim 1, characterized in that: The second pressure valve comprises: A second elastic member, one end of which is connected to the bottom plate of the engine cylinder head through a second connecting portion, and the other end of which is abutted against the bottom limiting platform of the bottom plate through a second water baffle.

7. The engine cylinder head according to claim 1, characterized in that: The engine cylinder head further comprises: a water pump, wherein a water outlet of the water pump is connected to a water inlet of the lower water jacket.

8. The engine cylinder head according to claim 1, characterized in that: The opening pressure of the first pressure valve is lower than the opening pressure of the second pressure valve.

9. An engine cooling method, characterized in that: Applied to the engine cylinder head according to any one of claims 1 to 8, the method comprises: Obtain the thermal load information corresponding to the engine; When the heat load information is low load, the coolant pressure is controlled to be less than or equal to the opening pressure corresponding to the first pressure valve; When the heat load information indicates a relatively high load, the coolant pressure is controlled to be greater than the opening pressure corresponding to the first pressure valve and less than or equal to the opening pressure corresponding to the second pressure valve; When the heat load information indicates a high load, the coolant pressure is controlled to be greater than the opening pressure corresponding to the second pressure valve.

10. An engine, characterized in that: Comprising an engine cylinder head as described in any one of claims 1-8.

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