Method and device for determining skeleton of combustion system in engine and vehicle

Abstract

The invention discloses a skeleton determination method and device for a combustion system in an engine and a vehicle. The method comprises the steps that a volume image of a cylinder cover combustion chamber in a combustion system of an engine is obtained, an initial skeleton model set of the combustion system is determined based on the volume image, and the volume image represents volume change results under different shed top included angles and different shed top heights; different volumes correspond to different initial skeleton models in the initial skeleton model set; based on first attribute information of a valve avoiding pit of a combustion system in the initial skeleton model, screening the initial skeleton model set to obtain a first screening result; based on second attribute information of an air inlet system and an exhaust system of the combustion system in the first screening result, the first screening result is screened, and a second screening result is obtained; and determining a target skeleton model of the combustion system from the second screening result based on the shape of the flow guide surface in the combustion system. The technical problem of low skeleton determination accuracy of the combustion system is solved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a method, a device and a vehicle for determining a framework of a combustion system in an engine. Background Art

[0002] At present, the framework construction of the combustion system in the vehicle is very important for the economy, power and comfort of the engine. However, in the relevant technology, the framework construction method is very one-sided and cannot comprehensively consider the design parameters such as the spacing and angle between the components in the combustion system, and the impact on the combustion system's functions such as knock suppression, high power and low fuel consumption.

[0003] Due to the lack of systematic tools and methods in the relevant technology to accurately evaluate the impact of various design parameters on engine performance, it is not only time-consuming and labor-intensive, but it may not be possible to find a solution that satisfies the conditions in the whole world. In addition, due to the diversity of design parameters, it is difficult to fully consider possible design combinations using manual methods, which will also affect the accuracy of skeleton determination. Therefore, there is still a technical problem of low accuracy in skeleton determination of combustion systems.

[0004] With respect to the technical problem of low accuracy in determining the skeleton of the above-mentioned combustion system, no effective solution has been proposed so far. Summary of the invention

[0005] Embodiments of the present invention provide a method, device and vehicle for determining the skeleton of a combustion system in an engine, so as to at least solve the technical problem of low accuracy in determining the skeleton of the combustion system.

[0006] According to one aspect of an embodiment of the present invention, a method for determining the skeleton of a combustion system in an engine is provided. The method may include: obtaining a volume image of a cylinder head combustion chamber in a combustion system of the engine, and determining an initial skeleton model set of the combustion system based on the volume image, wherein the volume image is used to represent the change result of the volume of the cylinder head combustion chamber under different roof angles and different roof heights, and different volumes correspond to different initial skeleton models in the initial skeleton model set; based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, the initial skeleton model set is screened to obtain a first screening result, wherein the first screening result is an initial skeleton model whose first attribute information meets the first attribute information threshold; based on the second attribute information of both the intake system and the exhaust system of the combustion system in the first screening result, the first screening result is screened to obtain a second screening result, wherein the second screening result is a first screening result whose second attribute information meets the second attribute information threshold; based on the shape of the guide surface in the combustion system, the target skeleton model of the combustion system is determined from the second screening result.

[0007] Optionally, determining an initial skeleton model set of the combustion system based on the volume image includes: filtering out a volume band of a cylinder head combustion chamber from the volume image, wherein the volume band is used to represent a volume range that meets displacement requirements and compression ratio requirements; and determining an initial skeleton model set based on the volume band.

[0008] Optionally, the intake system includes an intake seat ring, and the exhaust system includes an exhaust seat ring, wherein a volume band of a cylinder head combustion chamber is screened out from the volume image, including: based on the volume proportion of the cylinder head combustion chamber and the compression ratio and stroke of the engine, the volume band is screened out from the volume image; based on the volume band, an initial skeleton model set is determined, including: based on the volume in the volume band, the seat ring properties corresponding to the intake seat ring and the exhaust seat ring respectively, and the depth change of the valve avoidance pit, the initial skeleton model set is determined, wherein the seat ring properties include at least the sealing surface thickness of the intake seat ring or the exhaust seat ring, the thickness of the wall between the bottom hole of the intake seat ring or the exhaust seat ring and the mounting hole of the spark plug in the combustion system, the wall thickness of the intake seat ring or the exhaust seat ring, and the height of the intake seat ring or the exhaust seat ring.

[0009] Optionally, based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, the initial skeleton model set is screened to obtain a first screening result, including: obtaining the angle range of the intake angle and the exhaust angle of the engine, and the eccentricity range of the spark plug in the combustion system; based on the angle range, determining the angle variation range of the intake angle and the exhaust angle, and the roof height variation range; based on the angle variation range, the roof height variation range and the eccentricity range, the initial skeleton model is screened to obtain a first screening result.

[0010] Optionally, the first attribute information includes depth information of the valve avoidance pit and distance information between the valve avoidance pit and the first air ring of the engine, and the first attribute information threshold includes a depth information threshold and a distance information threshold, wherein the initial skeleton model is screened based on the angle variation range, the roof height variation range and the eccentricity range to obtain a first screening result, including: taking the angle variation range, the roof height variation range and the eccentricity range as variables, based on whether the depth information is less than or equal to the depth information threshold, and whether the distance information is greater than or equal to the distance information threshold, the initial skeleton model is screened to obtain a first screening result.

[0011] Optionally, based on the second attribute information of the intake system and the exhaust system of the combustion system in the first filtering result, the first filtering result is filtered to obtain a second filtering result, including: based on the constraints and variable information set by the second attribute information, the first filtering result is filtered to obtain the second filtering result so that the volume of the cylinder head combustion chamber is less than the volume threshold.

[0012] Optionally, the intake system includes an intake seat ring, an intake valve and an intake duct, and the exhaust system includes an exhaust seat ring and an exhaust valve. The constraints include at least the thickness of the intake seat ring, the thickness of the exhaust seat ring, the spacing between the intake valve and the cylinder barrel of the engine when the intake valve moves, the spacing between the exhaust valve and the cylinder barrel when the exhaust valve moves, and the thickness of the wall between the intake duct and the water jacket of the engine. The variable information includes at least the angle of the intake valve, the angle of the exhaust valve, the sealing surface diameter of the intake seat ring and the sealing surface diameter of the exhaust seat ring.

[0013] According to another aspect of an embodiment of the present invention, a skeleton determination device for a combustion system in an engine is also provided. The device may include: a first determination unit, used to obtain a volume image of a cylinder head combustion chamber in a combustion system of the engine, and determine an initial skeleton model set of the combustion system based on the volume image, wherein the volume image is used to represent the change result of the volume of the cylinder head combustion chamber under different roof angles and different roof heights, and different volumes correspond to different initial skeleton models in the initial skeleton model set; a first screening unit, used to screen the initial skeleton model set based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, and obtain a first screening result, wherein the first screening result is an initial skeleton model whose first attribute information meets the first attribute information threshold; a second screening unit, used to screen the first screening result based on the second attribute information of both the intake system and the exhaust system of the combustion system in the first screening result, and obtain a second screening result, wherein the second screening result is the first screening result whose second attribute information meets the second attribute information threshold; a second determination unit, used to determine the target skeleton model of the combustion system from the second screening result based on the shape of the guide surface in the combustion system.

[0014] According to another aspect of an embodiment of the present invention, a processor is provided, which is used to run a program, wherein the method for determining a skeleton of a combustion system in an engine according to an embodiment of the present invention is executed when the program is run.

[0015] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided. The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the skeleton determination method of the combustion system in the engine of the embodiment of the present invention.

[0016] According to another aspect of an embodiment of the present invention, an electronic device is also provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the skeleton determination method of the combustion system in the engine of the embodiment of the present invention.

[0017] According to another aspect of an embodiment of the present invention, a computer program product is provided, which includes a computer program, and when the computer program is executed by a processor, the method for determining a skeleton of a combustion system in an engine according to the embodiment of the present application is implemented.

[0018] According to another aspect of an embodiment of the present invention, a vehicle is further provided, which is used to implement the method for determining a framework of a combustion system in an engine according to the embodiment of the present application.

[0019] In an embodiment of the present invention, if it is necessary to design a skeleton model of a combustion system that meets the conditions, the three aspects of the economy, power and reliability of the engine can be comprehensively considered. Specifically, in the process of designing the skeleton model of the combustion system in the engine, the volume change results of the cylinder head combustion chamber of the combustion system under the influence of different roof angles and different roof heights can be obtained to form a volume image, and the volume image is used to set the initial skeleton model of the combustion system to be screened. Considering the influence of the first attribute information of the valve avoidance pit on the economy and reliability of the combustion system, the first attribute information can be used to perform the first-level screening of the initial skeleton model. Considering the influence of the second attribute information corresponding to the intake system and the exhaust system on the economy, reliability and power of the combustion system, the second attribute information can be used to perform the second-level screening of the first screening results. Considering the influence of the shapes of different guide surfaces on the final effect, the second screening results can be screened in the third level to obtain the final target skeleton model.

[0020] In this embodiment, the effects of several key components in the combustion system on the economy, power and reliability of the engine are comprehensively considered, so that a skeleton model that can ensure the above three performances of the engine can be screened out. Through the comprehensive consideration of the above skeleton design, the technical effect of improving the accuracy of the skeleton determination of the combustion system can be achieved, and the technical problem of low accuracy of the skeleton determination of the combustion system can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 is a flow chart of a method for determining a skeleton of a combustion system in an engine according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the distance between the water jacket and the upper edge of the seat ring in the nose bridge area of ​​the cylinder head combustion chamber according to an embodiment of the present invention;

[0024] Figure 3is a schematic diagram of the effect of different valve angles on cylinder tumble flow according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the effect of different intake and exhaust valve angle combinations on the tumble flow in the cylinder according to an embodiment of the present invention;

[0026] Figure 5 is a flowchart of a skeleton definition process according to an embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of a valve angle and a roof height according to an embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of a tumble guide surface between intake and exhaust according to an embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of a cylinder head combustion chamber volume image according to an embodiment of the present invention;

[0030] Fig. 9 is a schematic diagram of a cylinder head combustion chamber volume band selected according to an embodiment of the present invention;

[0031] Fig.10 is a top view of an initial skeleton model according to an embodiment of the present invention;

[0032] Fig.11 is a front view of an initial skeleton model according to an embodiment of the present invention;

[0033] FIG. 12( a ) is a schematic diagram of a round of intake screening results when a spark plug is 0 mm away from the exhaust side according to an embodiment of the present invention;

[0034] FIG12( b ) is a schematic diagram of exhaust screening results of a round when a spark plug is 0 mm away from the exhaust side according to an embodiment of the present invention;

[0035] FIG. 13( a ) is a schematic diagram of a round of intake screening results when a spark plug deviates 0.5 mm from the exhaust side according to an embodiment of the present invention;

[0036] FIG13( b ) is a schematic diagram of exhaust screening results of a spark plug when it is 0.5 mm away from the exhaust side according to an embodiment of the present invention;

[0037] FIG. 14( a ) is a schematic diagram of a round of intake screening results when a spark plug is 1 mm away from the exhaust side according to an embodiment of the present invention;

[0038] FIG14( b ) is a schematic diagram of exhaust screening results of a spark plug when it is 1 mm away from the exhaust side according to an embodiment of the present invention;

[0039] FIG. 15( a ) is a schematic diagram of a round of intake screening results when a spark plug deviates 1.5 mm from the exhaust side according to an embodiment of the present invention;

[0040] FIG. 15( b ) is a schematic diagram of exhaust screening results of a spark plug when it is 1.5 mm away from the exhaust side according to an embodiment of the present invention;

[0041] FIG. 16( a ) is a schematic diagram of a round of intake screening results when a spark plug is 2 mm away from the exhaust side according to an embodiment of the present invention;

[0042] FIG16( b ) is a schematic diagram of exhaust screening results of a round when a spark plug deviates 2 mm from the exhaust side according to an embodiment of the present invention;

[0043] FIG. 17( a ) is a schematic diagram of a calculation process of a final skeleton model according to an embodiment of the present invention;

[0044] FIG17( b) is a schematic diagram of calculation results of a final skeleton model according to an embodiment of the present invention;

[0045] FIG. 18( a ) is a front view of an initial skeleton model of Scheme 1 in a second round of screening results according to an embodiment of the present invention;

[0046] FIG. 18( b ) is a top view of the skeleton initial model of Scheme 1 in the second round screening results according to an embodiment of the present invention;

[0047] FIG. 18( c ) is a front view of the skeleton initial model of Scheme 2 in the second round screening results according to an embodiment of the present invention;

[0048] FIG18( d ) is a top view of the skeleton initial model of Scheme 2 in the second round screening results according to an embodiment of the present invention;

[0049] FIG. 18( e ) is a front view of the skeleton initial model of Scheme 3 in the second round screening results according to an embodiment of the present invention;

[0050] FIG18( f ) is a top view of the skeleton initial model of Scheme 3 in the second round screening results according to an embodiment of the present invention;

[0051] FIG. 18( g ) is a front view of the skeleton initial model of Scheme 4 in the second round screening results according to an embodiment of the present invention;

[0052] FIG18( h) is a top view of the skeleton initial model of Scheme 4 in the second round screening results according to an embodiment of the present invention;

[0053] Fig.19 is a schematic diagram of a skeleton determination device for a combustion system in an engine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0056] According to an embodiment of the present invention, an embodiment of a method for determining the skeleton of a combustion system in an engine is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0057] Figure 1 is a flow chart of a method for determining a skeleton of a combustion system in an engine according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0058] Step S102, acquiring a volume image of a cylinder head combustion chamber in a combustion system of the engine, and determining an initial skeleton model set of the combustion system based on the volume image;

[0059] In the technical solution provided in the above step S102 of the present invention, the volume image is used to represent the change result of the volume of the cylinder head combustion chamber under different roof angles and different roof heights. Different volumes correspond to different initial skeleton models in the initial skeleton model set. The engine can be a gasoline engine, that is, a gasoline engine.

[0060] Optionally, a volume image, also called a volume map (MAP), is an image used to represent the volume distribution inside an object. For example, a simplified model volume MAP of a cylinder head combustion chamber at different roof angles and heights may be provided.

[0061] It should be noted that the above-mentioned method of obtaining the volume image is only for illustration and is not specifically limited here. As long as it is a visualization result that can represent the change of the cylinder head combustion chamber volume with different parameters, the volume image used to determine the initial skeleton model set of the combustion system is within the protection scope of the embodiments of the present invention and will not be explained one by one here.

[0062] In this embodiment, by acquiring the volume image of the cylinder head combustion chamber in the combustion system of the engine, the shape and volume size of the cylinder head combustion chamber can be determined, thereby providing a reference for designing the initial skeleton model of the combustion system, and then determining the initial skeleton model set of the combustion system. By determining the initial skeleton model set of the combustion system, subsequent design and optimization work can be better carried out to ensure the performance of the engine.

[0063] Optionally, the volumetric image can be obtained by scanning the cylinder head combustion chamber with a three-dimensional scanner or a laser scanner and processed by corresponding software, or the cylinder head combustion chamber can be modeled using computer-aided design software and then calculated by software functions.

[0064] Optionally, the initial skeleton model can be an initial model established using parametric modeling software (e.g., Creo) taking into account economy, power, reliability, and the volume of the cylinder head combustion chamber in the engine's combustion system. Creo is a three-dimensional CAD design software that can be used to create and optimize the skeleton structure of the combustion system to achieve a balanced functional definition of power, economy, and reliability.

[0065] Step S104, based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, the initial skeleton model set is screened to obtain a first screening result.

[0066] In the technical solution provided in the above step S104 of the present invention, after obtaining the volume image of the cylinder head combustion chamber in the combustion system of the engine and determining the initial skeleton model set of the combustion system based on the volume image, the initial skeleton model set can be screened based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model to obtain a first screening result.

[0067] In this embodiment, the first attribute information may include the valve avoidance pit depth and the distance between the valve avoidance pit and a ring.

[0068] Optionally, the initial skeleton model set is screened, which may also be referred to as performing a round of screening on the skeleton structure.

[0069] In an embodiment of the present invention, in view of the influence of the valve avoidance pit on the economy and reliability of the engine, the design of the valve avoidance pit is taken into consideration during a round of screening of the skeleton structure of the engine's combustion system, that is, how to set the first attribute information of the valve avoidance pit. The first attribute information of the valve avoidance pit can affect the distribution and intensity of the airflow in the combustion chamber, especially during the compression process, which helps to form more efficient turbulence, which is beneficial to the rapid propagation of the flame and the uniform combustion of the mixture, thereby suppressing knock and achieving the purpose of reliability requirements. Therefore, by setting reasonable first attribute information to screen the initial skeleton model, the purpose of enhancing turbulence in the combustion process, accelerating the combustion speed, and improving the combustion efficiency can be achieved, thereby reducing the fuel consumption of the engine to achieve the technical effect of improving the economy requirements of the engine.

[0070] Step S106, based on the second attribute information of both the intake system and the exhaust system of the combustion system in the first screening result, the first screening result is screened to obtain a second screening result.

[0071] In the technical solution provided in the above step S106 of the present invention, the initial skeleton model set is screened based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model. After the first screening result is obtained, the first screening result can be screened based on the second attribute information of both the intake system and the exhaust system of the combustion system in the first screening result to obtain the second screening result.

[0072] In this embodiment, the intake system is responsible for introducing air or a mixture of air and fuel into the combustion chamber of the engine. The exhaust system is responsible for discharging the exhaust gas after combustion from the engine. Through the intake system and the exhaust system, the performance and efficiency of the engine can be improved, strict emission standards can be met, a balance between environmental protection and power can be achieved, and the purpose of power and economy requirements can be achieved.

[0073] Optionally, the intake system and the exhaust system may include various intake and exhaust components, respectively. For example, the intake system may include an air filter, an intake pipe, an intake valve, etc. The exhaust system may include an exhaust pipe, a catalytic converter, a muffler, an exhaust pipe, etc. It should be noted that the components included in the above-mentioned intake system and exhaust system are only for illustration and are not specifically limited here.

[0074] Optionally, the second attribute information corresponding to the intake system and the exhaust system may include the intake / exhaust valve angle, the intake / exhaust roof height, and the diameter at the intake / exhaust sealing surface. It should be noted that the above-mentioned second attribute information is only for illustration and is not specifically limited here. As long as the second attribute information in the intake system and the exhaust system can affect the reliability, economy and power of the engine, it is within the protection scope of the embodiment of the present invention. Optionally, the second screening result is the first screening result in which the second attribute information meets the second attribute information threshold.

[0075] Optionally, the first screening result may be further screened using the second attribute information corresponding to the intake system and the exhaust system, that is, a second round of screening may be performed on the skeleton structure.

[0076] In the embodiment of the present invention, the first screening result obtained by screening has taken into account the impact of the valve avoidance pit on the performance of the engine, and the second round of screening is based on the second attribute information of the intake system and the exhaust system. By evaluating the attributes, a skeleton model that provides good airflow guidance, reduces squeezing losses, and can effectively control the shape and volume of the combustion chamber can be further screened out to achieve the purpose of reliability requirements, thereby achieving the technical effect of improving the accuracy of the skeleton determination of the combustion system and solving the technical problem of low accuracy of the skeleton determination of the combustion system.

[0077] Step S108, based on the shape of the guide surface in the combustion system, determine the target skeleton model of the combustion system from the second screening results.

[0078] In the technical solution provided in the above step S108 of the present invention, the first screening result is screened based on the second attribute information of the intake system and the exhaust system of the combustion system in the first screening result. After the second screening result is obtained, the target skeleton model of the combustion system can be determined from the second screening result based on the shape of the guide surface in the combustion system.

[0079] In this embodiment, the guide surface can be an intake and exhaust guide surface, which can help guide air flow and improve air circulation efficiency, thereby improving the performance of the intake and exhaust system. The guide surface can be conical in shape, which can effectively guide the gas to the combustion area and promote gas mixing and combustion, or it can be spherical or conical.

[0080] It should be noted that this is only an example and is not specifically limited. As long as it can be used to determine the shape of the guide surface of the target skeleton model of the combustion system from the second screening result based on the shape of the guide surface in the combustion system, it is within the protection scope of the embodiment of the present invention.

[0081] In the embodiment of the present invention, it is considered that the shape of the guide surface is crucial to the flow field distribution in the combustion chamber of the engine, especially in the process of designing a high-efficiency, low-emission combustion system. The shape of the guide surface can promote the formation of a stable and moderately strong tumble flow of the gas in the cylinder, control the uniform distribution of the mixture, accelerate the combustion process, improve the combustion efficiency, and reduce the production of unburned hydrocarbons, thereby reducing emissions. Therefore, the shape of the guide surface can be used as a condition for the third screening of the skeleton model. By screening out a suitable guide surface shape, a skeleton model that meets the above-mentioned high-efficiency, low-emission combustion system can be obtained, thereby achieving the technical effect of improving the power and fuel economy of the engine.

[0082] In the above steps S102 to S108 of the present invention, if it is necessary to design a skeleton model of a combustion system that meets the conditions, the three aspects of the economy, power and reliability of the engine can be comprehensively considered. Specifically, in the process of designing the skeleton model of the combustion system in the engine, the volume change results of the cylinder head combustion chamber of the combustion system under the influence of different roof angles and different roof heights can be obtained to form a volume image, and the volume image can be used to set the initial skeleton model of the combustion system to be screened. Considering the influence of the first attribute information of the valve avoidance pit on the economy and reliability of the combustion system, the first attribute information can be used to perform the first-level screening of the initial skeleton model. Considering the influence of the second attribute information corresponding to the intake system and the exhaust system on the economy, reliability and power of the combustion system, the second attribute information can be used to perform the second-level screening of the first screening results. Considering the influence of the shapes of different guide surfaces on the final effect, the second screening results can be screened in the third level to obtain the final target skeleton model.

[0083] In this embodiment, the effects of several key components in the combustion system on the economy, power and reliability of the engine are comprehensively considered, so that a skeleton model that can ensure the above three performances of the engine can be screened out. Through the comprehensive consideration of the above skeleton design, the technical effect of improving the accuracy of the skeleton determination of the combustion system can be achieved, and the technical problem of low accuracy of the skeleton determination of the combustion system can be solved.

[0084] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0085] As an optional implementation method, step S102, determining an initial skeleton model set of the combustion system based on the volume image, includes: filtering out a volume band of the cylinder head combustion chamber from the volume image, wherein the volume band is used to represent a volume range that meets displacement requirements and compression ratio requirements; and determining an initial skeleton model set based on the volume band.

[0086] In this embodiment, in the process of determining the initial skeleton model set of the combustion system based on the volume image, the volume band of the cylinder head combustion chamber can be screened out from the volume image, and the initial skeleton model set can be determined based on the volume band. The volume band is used to represent the volume range that meets the displacement requirement and the compression ratio requirement, that is, it can be based on the displacement and maximum compression ratio of the engine, and refer to the data of the volume ratio of the cylinder head combustion chamber of the previous model.

[0087] Optionally, a qualified cylinder head combustion chamber volume band may be screened out from the volume MAP diagram, and the volume band may define an upper limit and a lower limit of the combustion chamber volume.

[0088] Optionally, after the volume band is determined, the corresponding initial skeleton model can be determined according to the volume of each cylinder head combustion chamber that meets the conditions within the range of the volume band, so as to establish an initial skeleton model set. The initial skeleton model can be a simplified geometric shape, such as a cylinder or a cuboid, which represents the approximate shape and size of the cylinder head combustion chamber. There is no specific limitation here, and it is only for example.

[0089] As an optional embodiment, the intake system includes an intake seat ring, and the exhaust system includes an exhaust seat ring, wherein a volume band of a cylinder head combustion chamber is screened out from the volume image, including: based on the volume ratio of the cylinder head combustion chamber and the compression ratio and stroke of the engine, the volume band is screened out from the volume image; based on the volume band, an initial skeleton model set is determined, including: based on the volume in the volume band, the seat ring properties corresponding to the intake seat ring and the exhaust seat ring respectively, and the depth change of the valve avoidance pit, the initial skeleton model set is determined, wherein the seat ring properties include at least the sealing surface thickness of the intake seat ring or the exhaust seat ring, the thickness of the wall between the bottom hole of the intake seat ring or the exhaust seat ring and the mounting hole of the spark plug in the combustion system, the wall thickness of the intake seat ring or the exhaust seat ring, and the height of the intake seat ring or the exhaust seat ring.

[0090] In this embodiment, in the process of filtering out the volume band of the cylinder head combustion chamber from the volume image, the volume band can be filtered from the volume image based on the volume proportion of the cylinder head combustion chamber and the compression ratio and stroke of the engine. In the process of determining the initial skeleton model set based on the volume band, the initial skeleton model set can be determined based on the volume in the volume band, the seat ring attributes corresponding to the intake seat ring and the exhaust seat ring, and the depth change of the valve avoidance pit. Among them, the intake system includes an intake seat ring, and the exhaust system includes an exhaust seat ring. The seat ring attributes corresponding to the exhaust system and the intake system can at least include the sealing surface thickness of the intake seat ring or the exhaust seat ring, the thickness of the wall between the bottom hole of the intake seat ring or the exhaust seat ring and the mounting hole of the spark plug in the combustion system, the wall thickness of the intake seat ring or the exhaust seat ring, and the height of the intake seat ring or the exhaust seat ring, and can also include the distance between the seat ring and the cylinder head.

[0091] In this embodiment, the volume of the cylinder head combustion chamber can be determined by the following formula:

[0092]

[0093] Among them, Vh can be used to indicate the total displacement of the engine, S can be used to indicate the stroke, CR can be used to indicate the compression ratio, and a can be used to indicate the cylinder head volume ratio.

[0094] In this embodiment, in the process of using Creo to establish the initial model, the initial skeleton model can be established based on minimizing the sealing surface thickness of the intake seat ring or the exhaust seat ring, the partition wall thickness of the intake seat ring or the exhaust seat ring, the thickness of the partition wall of the spark plug mounting hole, the height of the intake seat ring or the exhaust seat ring, the distance between the seat ring and the cylinder head, the dynamic change of the valve avoidance pit depth with the angle, and the corresponding minimum diameter of the intake / exhaust sealing surface.

[0095] As an optional implementation method, step S104, based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, the initial skeleton model set is screened to obtain a first screening result, including: obtaining the angle range of the intake angle and the exhaust angle of the engine, and the eccentricity range of the spark plug in the combustion system; based on the angle range, determining the angle variation range of the intake angle and the exhaust angle, and the roof height variation range; based on the angle variation range, the roof height variation range and the eccentricity range, the initial skeleton model is screened to obtain a first screening result.

[0096] In this embodiment, in the process of screening the initial skeleton model set based on the first attribute information of the valve avoidance pit, the angle range of the intake angle and the exhaust angle of the engine, as well as the eccentricity range of the spark plug in the combustion system can be obtained. Based on the angle range, the angle variation range of the intake angle and the exhaust angle, as well as the roof height variation range are determined. Based on the angle variation range, the roof height variation range and the eccentricity range, the initial skeleton model is screened to obtain the first screening result. Among them, the angle range can be set to the angle range of the intake angle and the exhaust angle not less than 13°. The angle variation range can also be referred to as the intake / exhaust valve angle variation range. The intake / exhaust valve angle variation range corresponding to the above angle range can be 13-36°. The intake / exhaust roof height variation range is -6-5mm.

[0097] It should be noted that the above-mentioned angle range, angle variation range and inlet / exhaust roof height variation range are only set as examples and are not specifically limited here.

[0098] Optionally, in the process of defining the valve angle range, in order to ensure that the intake and exhaust cams of the engine do not interfere, the intake angle + exhaust angle can be set to ≥30°, and further, the difference between the intake and exhaust angles can be set to ≤4°. Based on the above information, the minimum intake and exhaust angles must not be less than 13°. During the first round of screening of the skeleton model, the valve angle, roof height, and spark plug eccentricity can be used as variables to screen whether the valve avoidance pit depth and the distance between the valve avoidance pit and the first ring meet the requirements to ensure the normal operation and performance optimization of the engine. By screening and matching these key parameters, interference between the intake and exhaust cams can be avoided, the normal formation of the initial tumble flow can be ensured, and the requirements for minimizing the intake and exhaust angles can be met, thereby improving the combustion economy, power, and reliability of the engine.

[0099] As an optional implementation method, the first attribute information includes depth information of the valve avoidance pit and distance information between the valve avoidance pit and the first air ring of the engine, and the first attribute information threshold includes a depth information threshold and a distance information threshold, wherein the initial skeleton model is screened based on the angle variation range, the roof height variation range and the eccentricity range to obtain a first screening result, including: taking the angle variation range, the roof height variation range and the eccentricity range as variables, based on whether the depth information is less than or equal to the depth information threshold, and whether the distance information is greater than or equal to the distance information threshold, the initial skeleton model is screened to obtain a first screening result.

[0100] In this embodiment, in the process of screening the initial skeleton model based on the angle variation range, the roof height variation range and the eccentricity range, the angle variation range, the roof height variation range and the eccentricity range can be used as variables to determine whether the depth information is less than or equal to the depth information threshold, and whether the distance information is greater than or equal to the distance information threshold, to screen the initial skeleton model and obtain a first screening result. Among them, the first attribute information may include the depth information of the valve avoidance pit, and may also include the distance information between the valve avoidance pit and the first gas ring of the engine. That is, the distance information can be the distance between the valve avoidance pit and the first ring, which is used to represent the distance between the edge of the valve avoidance pit at the top of the piston and the upper edge of the piston ring (the first ring, that is, the first ring). The first attribute information threshold includes a depth information threshold and a distance information threshold.

[0101] Optionally, the valve avoidance pit refers to a groove designed on the top of the engine piston to prevent the valve (intake valve or exhaust valve) from colliding with the top of the piston during certain working strokes. If the valve avoidance pit is too deep, the fuel-fuel mixture in the combustion chamber may not be fully contacted during combustion, affecting the completeness of combustion, increasing the emission of unburned fuel, and resulting in high concentrations of particulate matter (PN) and unburned hydrocarbons (HC) emitted by the engine. At the same time, it will also increase the heat dissipation area of ​​the top of the piston, affecting thermal efficiency. The distance between the valve avoidance pit and the first ring refers to the minimum distance between the edge of the valve avoidance pit and the first ring. If the spacing is too small, the valve avoidance pit may affect the sealing performance of the first ring, resulting in a decrease in cylinder pressure, reduced combustion efficiency, and increased fuel consumption and exhaust emissions. If the spacing is too large, the space on the top of the piston may not be fully utilized, affecting the compactness of the combustion chamber design, and may increase the volume of the combustion chamber, thereby affecting the compression ratio and combustion efficiency.

[0102] Optionally, when comparing the depth information and distance information with their corresponding depth information thresholds, if the depth information is less than or equal to the depth information threshold, and the distance information is greater than or equal to the distance information threshold, the skeleton model meets the requirements and can be used as the first screening result for subsequent further screening.

[0103] For example, with the valve angle, roof height, and spark plug eccentricity as variables, a first round of screening can be performed to see whether the valve avoidance pit depth and the distance between the valve avoidance pit and the first ring meet the requirements. For example, a first round of screening can be performed to see whether the valve avoidance pit depth is ≤3mm and whether the distance between the valve avoidance pit and the first ring is ≥3mm. At this point, the first screening result can be an initial skeleton model whose first attribute information meets the first attribute information threshold. The first attribute information threshold can be a restriction condition on the valve avoidance pit depth and the distance between the valve avoidance pit and the first ring, for example, the valve avoidance pit depth is not greater than 3mm, and the distance between the valve avoidance pit and the first ring of the piston is not less than 3mm.

[0104] It should be noted that the above-mentioned examples of the depth of the valve avoidance pit and the threshold setting of the distance between the valve avoidance pit and the first ring of the piston are only for illustration and no specific limitation is imposed here.

[0105] As an optional implementation method, step S106, based on the second attribute information of the intake system and the exhaust system of the combustion system in the first filtering result, the first filtering result is filtered to obtain a second filtering result, including: based on the constraint conditions and variable information set by the second attribute information, the first filtering result is filtered to obtain the second filtering result so that the volume of the cylinder head combustion chamber is less than the volume threshold.

[0106] In this embodiment, in the process of determining the second screening result of the skeleton model based on the second attribute information of both the intake system and the exhaust system, the cylinder head combustion chamber volume can be minimized by setting design constraints and variable information, and the first screening result can be screened to obtain a skeleton solution that satisfies the cylinder head combustion chamber volume being less than the volume threshold.

[0107] In this embodiment, by screening out the skeleton solutions that satisfy the cylinder head combustion chamber volume being less than the volume threshold, it can be ensured that the engine has higher combustion efficiency, cleaner emissions, and better power performance during the combustion process, thereby achieving the technical effect of improving the accuracy of the skeleton determination of the combustion system.

[0108] As an optional implementation method, the intake system includes an intake seat ring, an intake valve and an intake duct, and the exhaust system includes an exhaust seat ring and an exhaust valve. The constraints include at least the thickness of the intake seat ring, the thickness of the exhaust seat ring, the spacing between the intake valve and the cylinder barrel of the engine when the intake valve moves, the spacing between the exhaust valve and the cylinder barrel when the exhaust valve moves, and the thickness of the wall between the intake duct and the water jacket of the engine. The variable information includes at least the angle of the intake valve, the angle of the exhaust valve, the sealing surface diameter of the intake seat ring and the sealing surface diameter of the exhaust seat ring.

[0109] In this embodiment, the intake system includes an intake seat ring, an intake valve and an intake duct, and the exhaust system includes an exhaust seat ring and an exhaust valve. The thickness of the partition wall of the intake seat ring and the thickness of the partition wall of the exhaust seat ring in the constraint conditions must meet the requirements of structural reliability and cooling efficiency. The spacing between the intake valve and the exhaust valve and the cylinder barrel during movement can ensure the necessary condition that the valve and the cylinder barrel do not have physical contact. At the same time, the smoothness of the valve movement and the thickness of the partition wall between the intake duct and the water jacket must be considered to ensure the strength of the intake duct. And provide sufficient cooling water circulation space to cool the intake duct, reduce the intake temperature, and improve combustion efficiency. The angle between the intake valve and the exhaust valve in the variable information is a key parameter for adjusting the direction and intensity of the airflow entering and discharging. The sealing surface diameter of the intake seat ring and the exhaust seat ring can affect the flow rate of intake and exhaust, as well as the distribution of gas in the combustion chamber.

[0110] Optionally, the intake seat ring needs to ensure sufficient gas flow to provide a large amount of air required for high torque. At the same time, the shape and position of the seat ring should avoid unnecessary disturbance of the airflow, ensure smooth airflow, and form a tumble flow that is conducive to combustion.

[0111] Optionally, the size of the intake valve and the movement path of the valve itself have an important influence on the amount and distribution of airflow. By adjusting the angle of the intake valve, the angle of airflow entry can be optimized, thereby affecting the intensity and direction of the tumble flow. The geometry and size of the intake duct can affect the efficiency of intake and the distribution of airflow. The thickness of the partition wall of the exhaust seat ring can affect the combustion chamber volume and the valve movement path. A reasonable seat ring thickness can support the movement of the valve while avoiding increasing unnecessary combustion chamber volume and affecting the compression ratio and thermal efficiency. The size and position of the exhaust valve should ensure that the exhaust gas after combustion can be discharged quickly, while avoiding interference with the intake valve, ensuring the stability and reliability of the valve.

[0112] In the embodiment of the present invention, during the second round of screening of the skeleton structure, the optimal solution function of Creo can be used to minimize the volume of the cylinder head combustion chamber through design constraints and design variables. This can help the flame spread faster, thereby improving the reliability of the engine without causing knock. It can reduce the heat loss and mechanical loss of the engine, thereby reducing fuel consumption and improving the economy of the engine. It can improve the combustion efficiency and reduce the knock tendency, while maintaining or increasing the engine output power, reducing the torque loss, thereby improving the power of the engine.

[0113] In the embodiment of the present invention, if it is necessary to design a skeleton model of a combustion system that meets the conditions, the three aspects of the economy, power and reliability of the engine can be comprehensively considered. Specifically, in the process of designing the skeleton model of the combustion system in the engine, the volume change results of the cylinder head combustion chamber of the combustion system under the influence of different roof angles and different roof heights can be obtained to form a volume image, and the volume image is used to set the initial skeleton model of the combustion system to be screened. Considering the influence of the first attribute information of the valve avoidance pit on the economy and reliability of the combustion system, the first attribute information can be used to perform the first layer screening of the initial skeleton model. Considering the influence of the second attribute information corresponding to the intake system and the exhaust system on the economy, reliability and power of the combustion system, the second attribute information can be used to perform the second layer screening of the first screening result. Considering the influence of the shapes of different guide surfaces on the final effect, the second screening result can be screened in the third layer to obtain the final target skeleton model. In this embodiment, the influence of several key components in the combustion system on the economy, power and reliability of the engine is comprehensively considered, so that a skeleton model that can guarantee the above three performances of the engine can be screened. Through comprehensive consideration of the above-mentioned skeleton design, the technical effect of improving the accuracy of skeleton determination of the combustion system can be achieved, and the technical problem of low accuracy of skeleton determination of the combustion system can be solved.

[0114] Another optional specific implementation is described in detail below.

[0115] With the development of the automobile industry, the requirements for economy, power, reliability and other aspects are becoming more and more stringent. How to balance automobile fuel consumption, power torque, vibration and noise and other indicators is becoming more and more important. According to the thermodynamic formula, in the absence of knock, the higher the compression ratio, the higher the thermal efficiency and the lower the fuel consumption. However, knock often occurs at high compression ratio and high torque, which produces large vibrations, easily damages the engine, and also reduces fuel consumption. In this case, the vibration is often reduced by reducing torque, sacrificing power and economy. Therefore, suppressing knock is an important means to improve the three major indicators of the engine.

[0116] Generating higher turbulent kinetic energy during the ignition and combustion stages can make ignition more stable, accelerate the flame propagation speed, and effectively suppress knock. Only by forming an initial flow field with high tumble in the intake stage and reducing the attenuation of tumble near the intake bottom dead center can we ensure that the tumble fragmentation near the compression top dead center, that is, near the ignition moment, generates higher turbulent kinetic energy. The initial flow field is mainly affected by the shape of the intake duct and the cylinder head. The attenuation of tumble is mainly affected by the size of the piston block, and the size of the piston block is mainly affected by the volume of the cylinder head. In supercharged engines with higher dynamic indicators, the combustion temperature in the cylinder can also be reduced by adding exhaust gas recirculation. However, the exhaust gas recirculation temperature is higher than the intake temperature, and excessively high exhaust gas recirculation will cause knock problems. It is necessary to enhance the turbulent kinetic energy in the cylinder during the combustion stage to increase the flame propagation speed and improve the tolerance of exhaust gas recirculation without knock. Therefore, a cylinder head combustion chamber with a good shape and small volume is conducive to generating high turbulent kinetic energy during the ignition and combustion stages under a high compression ratio, thereby achieving stable ignition, increasing the flame propagation speed, and improving the tolerance for exhaust gas recirculation, thereby effectively suppressing knock, reducing engine fuel consumption, ensuring reliability, and improving power.

[0117] Since parameters such as the valve angle, height, and valve sealing zone diameter of the cylinder head combustion chamber have a great influence on reducing the volume of the cylinder head combustion chamber while ensuring the good shape of the cylinder head combustion chamber, it is very important to determine the framework of the combustion system.

[0118] Based on the above problems, the present invention discloses a method for determining the skeleton of a high-power and economic gasoline engine combustion system. If it is necessary to design a skeleton model of a combustion system that meets the conditions, the three aspects of the economy, power and reliability of the engine can be comprehensively considered. Specifically, in the process of designing the skeleton model of the combustion system in the engine, the volume change results of the cylinder head combustion chamber of the combustion system under the influence of different roof angles and different roof heights can be obtained to form a volume image, and the volume image is used to set the initial skeleton model of the combustion system to be screened. Considering the influence of the first attribute information of the valve avoidance pit on the economy and reliability of the combustion system, the first attribute information can be used to perform the first-level screening of the initial skeleton model. Considering the influence of the second attribute information corresponding to the intake system and the exhaust system on the economy, reliability and power of the combustion system, the second attribute information can be used to perform the second-level screening of the first screening result. Considering the influence of the shapes of different guide surfaces on the final effect, the second screening result can be screened in the third level to obtain the final target skeleton model.

[0119] In this embodiment, the effects of several key components in the combustion system on the economy, power and reliability of the engine are comprehensively considered, so that a skeleton model that can ensure the above three performances of the engine can be screened out. Through the comprehensive consideration of the above skeleton design, the technical effect of improving the accuracy of the skeleton determination of the combustion system can be achieved, and the technical problem of low accuracy of the skeleton determination of the combustion system can be solved.

[0120] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0121] In the design of engine combustion system, the design of skeleton boundary is related to the power, economy and reliability of the engine.

[0122] To achieve high power, high intake flowability is required to increase torque. This requires the intake duct to have a high flow coefficient. At the same time, the diameter of the intake sealing surface, that is, the valve and seat ring sealing line diameter (Diameter of Valve, DV) value, should be as large as possible, and the spark plug position should be biased towards the exhaust side.

[0123] To achieve economy, a high compression ratio is required, which leads to a greater tendency to knock. To suppress knock, three aspects can be taken into consideration: eliminating the sharp points in the cylinder head combustion chamber; reducing the temperature of the knock-prone area; and increasing the flame propagation speed. In order to eliminate the sharp points in the cylinder head combustion chamber, a sufficient gap should be left between the seat ring and the cylinder head combustion chamber blank to prevent the bottom of the seat ring from sinking into the cylinder head combustion chamber to produce local sharp points that are prone to knock. The spark plug is biased towards the exhaust side, and the flame takes a long time to propagate to the intake nose bridge area of ​​the cylinder head combustion chamber where the temperature is higher, which is prone to knock. The exhaust nose bridge area on the cylinder head combustion chamber has the highest temperature, which is also prone to knock. This requires leaving enough space between the intake / exhaust seat rings and adding a water jacket to cool these two knock-prone areas.

[0124] Figure 2 Schematic diagram of the distance between the water jacket and the upper edge of the seat ring in the nose bridge area of ​​the cylinder head combustion chamber according to an embodiment of the present invention. Figure 2 As shown, the wall thickness of the water jacket in the nose bridge area and the chamfer of the seat ring upper edge must be certain to ensure fatigue strength. The seat ring height should be as low as possible, and the seat ring should be as close to the cylinder head combustion chamber blank as possible, so that the water jacket in the nose bridge area will be close to the cylinder head combustion chamber nose bridge area, which can ensure the cooling effect. At the same time, a certain distance must be maintained between the intake / exhaust seat rings to ensure the width of the water jacket in the nose bridge area.

[0125] Figure 3 FIG. 1 is a schematic diagram showing the effect of different valve angles on cylinder tumble flow according to an embodiment of the present invention. Figure 3 As shown in the figure, increasing the flame propagation speed requires increasing the turbulent kinetic energy during the combustion process, and high tumble breakup forms high turbulent kinetic energy. Therefore, it is necessary to increase the tumble intensity before breakup, and a high tumble inlet is required to enhance the initial flow field. At the same time, a large intake angle is conducive to the formation of the initial tumble, that is, a large angle is more conducive to the formation of the initial tumble than a small angle.

[0126] Figure 4 Schematic diagram of the effect of different intake and exhaust valve angles on cylinder tumble flow according to an embodiment of the present invention. The coordination of intake and exhaust angles will also affect the development of tumble flow, such as Figure 4 As shown in the figure, if the exhaust angle difference is too large, the exhaust side roof will block the tumble flow. In order to reduce the piston's resistance to the tumble flow, the smaller the cylinder head combustion chamber volume is at the same compression ratio, the smaller the piston resistance is, and the small valve angle can effectively reduce the cylinder head combustion chamber volume.

[0127] In addition, low fuel consumption means that the energy generated after combustion is used to do more work. The greater the isochoricity of combustion, the greater the maximum explosion pressure, and the higher the reliability requirements for the cylinder head. The pressure and heat load between the bottom hole of the intake and exhaust seat ring and the spark plug mounting hole are both large, so sufficient wall thickness support is required. In order to improve thermal efficiency and reduce fuel consumption, a deep Miller cycle with a relatively small actual compression ratio can be used. The valve profile of this cycle is "thin and tall", and the impact force on the seat ring is large. However, the thicker the seat ring, the smaller the valve, which is not conducive to power. Therefore, the thickness of the seat ring should be as small as possible on the basis of ensuring reliability. When fuel consumption is low, more energy is converted into useful work, and the energy discharged is reduced, then the exhaust temperature is low, and the unburned hydrocarbons will be reduced during the exhaust process. Hydrocarbons are easily produced in the narrow gaps where the flame is not propagated. The side clearance is the smaller narrow gap in the combustion chamber. Therefore, the height of the firepower shore can be controlled to reduce the narrow gap. If the piston valve pit is too deep, it is easy to store oil, resulting in high concentrations of PN and unburned HC emitted by the engine. Therefore, the depth of the piston valve pit needs to be controlled.

[0128] In order to ensure reliability, since the valve and piston do not move upward or downward at the same time, there is a minimum distance between the valve and piston during movement. Therefore, the position of the valve and piston at the minimum distance can be calculated based on the valve profile, the use angle of the variable valve timing system, the crank, the connecting rod length and other parameters, and a sufficient safety distance can be left. The intake and exhaust valve angles are different, and the movement routes are different, so the minimum distance during the movement can be limited. The piston head temperature and the wall thickness between the piston valve pit and the first ring, the minimum spacing of the cylinder, the wall thickness between the intake duct and the water jacket, and the minimum spacing when the valve moves can be limited.

[0129] Based on the above considerations, the combustion system skeleton is designed. Figure 5 is a flowchart of a skeleton definition process according to an embodiment of the present invention. Figure 5 As shown, the process may include the following steps:

[0130] Step S501, screening the cylinder head volume range.

[0131] In this embodiment, firstly, a simplified model volume MAP diagram of the cylinder head combustion chamber under different roof angles and heights is made according to the cylinder diameter, and then the displacement and maximum compression ratio are used, and the volume proportion of the cylinder head combustion chamber of the previous engine model is referred to. Among them, Vh can be used to indicate the engine's overall displacement, S can be used to indicate the stroke, CR can be used to indicate the compression ratio, and a can be used to indicate the cylinder head volume ratio. Filter out the cylinder head combustion chamber volume band that meets the conditions from the volume MAP diagram to complete the screening of the cylinder head volume range.

[0132] Step S502, defining the valve angle range.

[0133] In this embodiment, to ensure that the intake and exhaust cams do not interfere, the intake angle + exhaust angle ≥ 30° can be set. To ensure initial tumble flow, the difference between the intake and exhaust angles can be set ≤ 4°, thereby obtaining that the minimum intake and exhaust angles must not be less than 13°.

[0134] Step S503, performing a round of screening on the skeleton structure.

[0135] In this embodiment, according to the structural boundaries considered above, the initial model can be established using Creo. The model is established based on the minimum seat thickness, the minimum wall thickness between the seat and the spark plug, the minimum wall thickness between the seat rings, the lowest seat height, the minimum distance between the seat ring and the cylinder head, the dynamic change of the valve avoidance pit depth with the included angle, and the minimum diameter of the intake / exhaust sealing surface set according to experience. With the valve included angle, the height of the roof, and the degree of spark plug eccentricity as variables, the first round of screening is carried out to determine whether the valve avoidance pit depth and the distance between the valve avoidance pit and the ring meet the requirements.

[0136] Optionally, after a round of screening of the skeleton structure, a skeleton model set can be obtained, and the models in the skeleton model set meet the preliminary requirements.

[0137] Step S504, performing a second round of screening on the skeleton structure.

[0138] Within the range of valve angle and ceiling height screened in the first round, additional screening dimensions were added, including the minimum distance between the valve and the cylinder barrel during valve movement, the position of the guide surface between the intake and exhaust, the wall thickness between the intake duct and the water jacket, and the minimum distance between the valve during valve movement. Using the optimal solution function of Creo, the cylinder head combustion chamber volume was minimized through design constraints and design variables. Finally, several skeleton solutions were obtained, completing the second round of skeleton structure screening.

[0139] Optionally, the design constraints include the wall thickness requirements between the intake / exhaust seat rings, the wall thickness requirements between the intake / exhaust seat ring bottom holes and the spark plug mounting holes, the minimum spacing requirements between the intake / exhaust valves and the cylinder barrel when they move, the spacing requirements between the intake / exhaust valve pits and a ring, the position and spacing requirements of the intake side tumble flow relative to the exhaust bottom surface, the minimum distance requirements during the movement of the intake and exhaust valves, and the wall thickness requirements between the intake duct and the water jacket.

[0140] Optionally, the design variables include an intake / exhaust valve angle, an intake / exhaust roof height, an exhaust side eccentricity of the spark plug, and a diameter at the intake / exhaust sealing surface.

[0141] Step S505, determining the final skeleton structure.

[0142] In this embodiment, the combustion system skeleton structure can be finally determined according to the shape of the guide surface between the intake and exhaust gases.

[0143] In the embodiment of the present invention, in the process of determining the framework scheme of the combustion system, a simplified model volume MAP diagram of the cylinder head combustion chamber under different roof angles and heights is made by using the cylinder diameter, and according to the displacement and maximum compression ratio, and referring to the volume proportion of the cylinder head combustion chamber of previous models, the formula is used. Filter out qualified cylinder head combustion chamber volume bands from the volume MAP diagram; based on the defined valve angle range and considering the structural boundaries, use Creo to establish an initial model and conduct a first round of screening of the skeleton structure; within the range of the valve angle and roof height screened out in the first round, increase the screening dimension, use Creo's optimal solution function, minimize the cylinder head combustion chamber volume through design constraints and design variables, derive several skeleton schemes, and complete the second round of screening of the skeleton structure; based on the shape of the guide surface between the intake and exhaust, the combustion system skeleton scheme can be finally determined to achieve the technical effect of improving the accuracy of the skeleton determination of the combustion system, thus solving the technical problem of low accuracy of the skeleton determination of the combustion system.

[0144] Figure 6 is a schematic diagram of a valve angle and a roof height according to an embodiment of the present invention, such as Figure 6 As shown in the figure, the roof height usually refers to the top of the combustion chamber, that is, the distance between the highest point of the combustion chamber part of the cylinder head and the piston top plane. Figure 6 As shown, a vertical distance is marked to describe the shape and volume of the combustion chamber. The roof height affects the turbulent kinetic energy during the combustion process. Too high a roof height may lead to reduced combustion efficiency. A too low roof height may affect the volume of the combustion chamber and the space for valve movement. The valve angle can represent the angle between the intake valve and the exhaust valve. The design of the valve angle has an important influence on the intake efficiency and tumble intensity of the engine. A smaller valve angle can reduce the volume of the combustion chamber and help improve combustion efficiency, but it may affect the layout of the valve and the flowability of the airway. A larger valve angle can improve airflow, but it may increase the volume of the combustion chamber, which is not conducive to improving thermal efficiency.

[0145] Figure 7 Schematic diagram of a tumble guide surface between intake and exhaust according to an embodiment of the present invention. Figure 7 As shown in the figure, the tumble guide surface between the intake and exhaust is a key part in the design of the engine combustion chamber. It can guide and maintain the tumble generated during the intake process until the compression and combustion stages to promote a better combustion process. Tumble is a rotating airflow formed in the combustion chamber, which can increase the turbulence of the mixture, accelerate the flame propagation speed, help suppress knock, and improve combustion efficiency and engine performance. According to the shape of the guide surface between the intake and exhaust, the skeleton scheme of the combustion system can be finally determined.

[0146] Figure 8 is a schematic diagram of a cylinder head combustion chamber volume image according to an embodiment of the present invention, such as Figure 8As shown, a simplified model volume MAP diagram of the cylinder head combustion chamber at different roof angles and heights can be made based on a cylinder diameter of 72.5 mm.

[0147] Fig. 9 is a schematic diagram of a cylinder head combustion chamber volume band selected according to an embodiment of the present invention, such as Fig. 9 As shown, based on the displacement of 1.5L-4 cylinder engine and the maximum compression ratio CR14, and referring to the previous models where the cylinder head combustion chamber volume ratio is 0.65-0.97, the formula is used The cylinder head combustion chamber volume band that meets the conditions can be screened out from the volume MAP diagram.

[0148] Fig.10 is a top view of an initial skeleton model according to an embodiment of the present invention, such as Fig.10 As shown, the minimum thickness at the sealing surface of the intake seat ring is 0.75mm, the minimum thickness at the sealing surface of the exhaust seat ring is 0.8mm, the minimum wall thickness between the bottom hole of the intake seat ring and the spark plug mounting hole is 3mm, the minimum wall thickness between the bottom hole of the exhaust seat ring and the spark plug mounting hole is 4mm, the minimum wall thickness between the intake seat rings is 4.9mm, the minimum wall thickness between the exhaust seat rings is 7.6mm, the minimum height of the intake / exhaust seat rings is 4.7mm, the minimum distance between the seat ring and the cylinder head blank is 0.5mm, the depth of the valve avoidance pit changes dynamically with the angle, and the intake sealing surface diameter is set to a minimum of 25.2mm and the exhaust sealing surface diameter is set to a minimum of 22.4mm according to experience. This is a top view of the initial skeleton model established as the basis.

[0149] Fig.11 is a front view of an initial skeleton model according to an embodiment of the present invention, such as Fig.11 As shown, the thickness of the intake seat ring sealing surface can be as small as 0.75mm, the thickness of the exhaust seat ring sealing surface can be as small as 0.8mm, the wall thickness between the bottom hole of the intake seat ring and the spark plug mounting hole can be as small as 3mm, the wall thickness between the bottom hole of the exhaust seat ring and the spark plug mounting hole can be as small as 4mm, the wall thickness between the intake seat rings can be as small as 4.9mm, the wall thickness between the exhaust seat rings can be as small as 7.6mm, the height of the intake / exhaust seat rings can be as low as 4.7mm, the distance between the seat ring and the cylinder head blank can be as small as 0.5mm, the depth of the valve avoidance pit can change dynamically with the angle, and the intake sealing surface diameter can be as small as 25.2mm and the exhaust sealing surface diameter can be as small as 22.4mm according to experience.

[0150] Based on the screened cylinder head volume band and the minimum valve angle of not less than 13° discussed above, the intake / exhaust valve angle range is 13-36°, and the intake / exhaust roof height range is -6-5mm. Based on experience and benchmarking, the spark plug eccentricity of 0-2mm on the exhaust side is added as a variable, and the spark plug eccentricity is stepped in steps of 0.5mm. The first round of screening is carried out to determine whether the valve avoidance pit depth is ≤3mm and whether the distance between the valve avoidance pit and a ring is ≥3mm.

[0151] Figure 12(a) is a schematic diagram of a round of screening results when a spark plug is 0 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 0 mm away from the exhaust side, as shown in Figure 12(a), the intake height H = 0.75mm-1.75mm, and the angle angle = 13°-15.5°.

[0152] Figure 12(b) is a schematic diagram of a round of exhaust screening results when a spark plug is 0 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 0 mm away from the exhaust side, as shown in Figure 12(b), the exhaust height H = -3mm-0mm, and the angle angle = 13°-27.5°.

[0153] Figure 13(a) is a schematic diagram of a round of screening results when a spark plug is 0.5mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 0.5mm away from the exhaust side, as shown in Figure 13(a), the intake height H = 0.2mm-1.7mm, and the angle angle = 13°-17.5°.

[0154] Figure 13(b) is a schematic diagram of a round of exhaust screening results when a spark plug is 0.5mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 0.5mm away from the exhaust side, as shown in Figure 13(b), the exhaust height H = -3.1mm-0.9mm, and the angle angle = 13°-27.5°.

[0155] Figure 14(a) is a schematic diagram of a round of intake screening results when a spark plug is 1 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 1 mm away from the exhaust side, as shown in Figure 14(a), the intake height H = -0.6mm-1.7mm, and the angle angle = 13°-19.5°.

[0156] Figure 14(b) is a schematic diagram of a round of exhaust screening results when a spark plug is 1 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 1 mm away from the exhaust side, as shown in Figure 14(b), the exhaust height H = -2.7mm-0.8mm, and the angle angle = 13°-26°.

[0157] Figure 15(a) is a schematic diagram of a round of screening results when a spark plug is 1.5 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 1.5 mm away from the exhaust side, as shown in Figure 15(a), the intake height H = -1.3mm-1.7mm, and the angle angle = 13°-21.5°.

[0158] Figure 15(b) is a schematic diagram of a round of exhaust screening results when a spark plug is 1.5 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 1.5 mm away from the exhaust side, as shown in Figure 15(b), the exhaust height H = -2.3mm-1mm, and the angle angle = 13°-24.5°.

[0159] Figure 16(a) is a schematic diagram of a round of screening results when a spark plug is 2 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 2 mm away from the exhaust side, as shown in Figure 16(a), the intake height H = -1.7mm-1.7mm, and the angle angle = 13°-23°.

[0160] Figure 16(b) is a schematic diagram of a round of exhaust screening results when a spark plug is 2 mm away from the exhaust side according to an embodiment of the present invention. When the spark plug is 2 mm away from the exhaust side, as shown in Figure 16(b), the exhaust height H = -1.7mm-1mm, and the angle angle = 13°-23°.

[0161] FIG17(a) is a schematic diagram of a calculation process of a final skeleton model according to an embodiment of the present invention. As shown in FIG17(a), the initial skeleton model is established by using Creo, and the cylinder head combustion chamber volume can be minimized through design constraints and design variables. For example, the thickness of the wall between the intake / exhaust seat ring in the design constraints and the range of variation of the intake valve angle in the design variables can minimize the cylinder head combustion chamber volume.

[0162] Figure 17(b) is a schematic diagram of the calculation results of a final skeleton model according to an embodiment of the present invention. As shown in Figure 17(b), by using the optimal solution function of Creo, by clicking "Calculate" in Figure 17(a), an optimization target convergence diagram can be generated.

[0163] Figure 18(a) is a front view of the skeleton initial model of Scheme 1 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(a), it is a front view of the skeleton initial model of Scheme 1 when the intake angle is 17.5°, the exhaust angle is 18.5°, the intake sealing surface diameter is 25.2mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is 0.24mm, the exhaust roof height is 0.5mm, the spark plug eccentricity is 1.2mm, and the cylinder head volume is 26.98ml.

[0164] Figure 18(b) is a top view of the skeleton initial model of Scheme 1 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(b), it is a top view of the skeleton initial model of Scheme 1 when the intake angle is 17.5°, the exhaust angle is 18.5°, the intake sealing surface diameter is 25.2mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is 0.24mm, the exhaust roof height is 0.5mm, the spark plug eccentricity is 1.2mm, and the cylinder head volume is 26.98ml.

[0165] Figure 18(c) is a front view of the skeleton initial model of Scheme 2 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(c), it is a front view of the skeleton initial model of Scheme 2 when the intake angle is 19°, the exhaust angle is 22.3°, the intake sealing surface diameter is 25.6mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is -0.17mm, the exhaust roof height is -1mm, the spark plug eccentricity is 1.6mm, and the cylinder head volume is 26.71ml.

[0166] Figure 18(d) is a top view of the skeleton initial model of Scheme 2 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(d), it is a top view of the skeleton initial model of Scheme 2 when the intake angle is 19°, the exhaust angle is 22.3°, the intake sealing surface diameter is 25.6mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is -0.17mm, the exhaust roof height is -1mm, the spark plug eccentricity is 1.6mm, and the cylinder head volume is 26.71ml.

[0167] Figure 18(e) is a front view of the skeleton initial model of Scheme 3 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(e), it is a front view of the skeleton initial model of Scheme 3 when the intake angle is 20°, the exhaust angle is 25°, the intake sealing surface diameter is 26mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is -0.47mm, the exhaust roof height is -2mm, the spark plug eccentricity is 1.96mm, and the cylinder head volume is 26.92ml.

[0168] Figure 18(f) is a top view of the skeleton initial model of Scheme 3 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(f), it is a top view of the skeleton initial model of Scheme 3 when the intake angle is 20°, the exhaust angle is 25°, the intake sealing surface diameter is 26mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is -0.47mm, the exhaust roof height is -2mm, the spark plug eccentricity is 1.96mm, and the cylinder head volume is 26.92ml.

[0169] Figure 18(g) is a front view of the skeleton initial model of Scheme 4 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(g), it is a front view of the skeleton initial model of Scheme 4 when the intake angle is 21.7°, the exhaust angle is 27.4°, the intake sealing surface diameter is 26.2mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is -0.77mm, the exhaust roof height is -2.97mm, the spark plug eccentricity is 2mm, and the cylinder head volume is 26.82ml.

[0170] Figure 18(h) is a top view of the skeleton initial model of Scheme 4 in the second round screening results according to an embodiment of the present invention. As shown in Figure 18(h), it is a top view of the skeleton initial model of Scheme 4 when the intake angle is 21.7°, the exhaust angle is 27.4°, the intake sealing surface diameter is 26.2mm, the exhaust sealing surface diameter is 22.4mm, the intake roof height is -0.77mm, the exhaust roof height is -2.97mm, the spark plug eccentricity is 2mm, and the cylinder head volume is 26.82ml.

[0171] In the embodiment of the present invention, within the range of the valve angle and the ceiling height screened in the first round, the screening dimension is increased, the minimum spacing between the valve and the cylinder barrel when the valve moves is 0.9, and the guide surface extending from the intake sealing surface intersects with the exhaust bottom surface, so that the exhaust angle does not match well, resulting in the exhaust valve blocking or the tumble flow not being fully utilized, the wall thickness between the intake duct and the water jacket is ≥3.5, and the minimum spacing when the valve moves is ≥2mm. Using the optimal solution function of Creo, through design constraints and design variables, the cylinder head combustion chamber volume is minimized, and the design constraints are that the wall thickness between the bottom hole of the intake seat ring and the spark plug mounting hole is ≥3mm, the wall thickness between the bottom hole of the exhaust seat ring and the spark plug mounting hole is ≥4mm, the wall thickness between the intake seat ring is ≥4.9mm, and the wall thickness between the exhaust seat ring is ≥7.6mm. The minimum spacing between the intake / exhaust valve and the cylinder barrel when the intake / exhaust valve moves is ≥0.9mm, the spacing between the intake / exhaust valve pit and the first ring is ≥3mm, and the intersection of the guide surface extending from the intake sealing surface and the exhaust valve is relative to the exhaust valve bottom coordinate system Z=0. The minimum distance during the movement of the intake and exhaust valves is ≥2mm, and the wall thickness between the intake duct and the water jacket is ≥3.5mm. Based on the results of the first round of skeleton screening, the design variables include the intake valve angle range of 13°-23°, the exhaust valve angle range of 13°-27.5°, the intake shed height range of -1.7mm-1.7mm, the exhaust shed height range of -3.1mm-0mm, the spark plug eccentric exhaust side 0mm-2mm, the intake sealing surface diameter is set to 20mm-40mm, and the exhaust sealing surface diameter is minimum 20mm-40mm. Four schemes were screened out through the second round of skeletons. Scheme 1 was finally selected because the guide surface shape of Scheme 1 was the best.

[0172] According to an embodiment of the present invention, a device for determining the skeleton of a combustion system in an engine is also provided. It should be noted that the device for determining the skeleton of a combustion system in an engine can be used to execute the method for determining the skeleton of a combustion system in an engine in the above embodiment.

[0173] Fig.19 Schematic diagram of a device for determining the skeleton of a combustion system in an engine according to an embodiment of the present invention. Fig.19 As shown, the device 1900 may include: a first determining unit 1901 , a first screening unit 1902 , a second screening unit 1903 , and a second determining unit 1904 .

[0174] The first determination unit 1901 is used to obtain a volume image of a cylinder head combustion chamber in a combustion system of the engine, and determine an initial skeleton model set of the combustion system based on the volume image, wherein the volume image is used to represent the change in volume of the cylinder head combustion chamber at different roof angles and different roof heights, and different volumes correspond to different initial skeleton models in the initial skeleton model set.

[0175] The first screening unit 1902 is used to screen the initial skeleton model set based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model to obtain a first screening result, wherein the first screening result is an initial skeleton model whose first attribute information meets the first attribute information threshold.

[0176] The second screening unit 1903 is used to screen the first screening result based on the second attribute information of the intake system and the exhaust system of the combustion system in the first screening result to obtain the second screening result, wherein the second screening result is the first screening result in which the second attribute information meets the second attribute information threshold.

[0177] The second determining unit 1904 is used to determine the target skeleton model of the combustion system from the second screening result based on the shape of the guide surface in the combustion system.

[0178] Optionally, the first determination unit 1901 may include: a first screening module, used to screen out a volume band of a cylinder head combustion chamber from the volume image; and a first determination module, based on the volume band, to determine an initial skeleton model set.

[0179] Optionally, the first screening unit 1902 may include: an acquisition module, used to obtain the angle range of the intake angle and the exhaust angle of the engine, and the eccentricity range of the spark plug in the combustion system; a second determination module, used to determine the angle variation range of the intake angle and the exhaust angle, and the roof height variation range based on the angle range; a first screening module, used to screen the initial skeleton model based on the angle variation range, the roof height variation range and the eccentricity range to obtain a first screening result.

[0180] Optionally, the second screening unit 1903 may include: screening the first screening result based on the constraint conditions and variable information set by the second attribute information to obtain a second screening result so that the volume of the cylinder head combustion chamber is less than the volume threshold.

[0181] In an embodiment of the present invention, a volume image of a cylinder head combustion chamber in a combustion system of an engine is obtained by a first determination unit 1901, and an initial skeleton model set of the combustion system is determined based on the volume image, wherein the volume image is used to represent the change result of the volume of the cylinder head combustion chamber at different roof angles and different roof heights, and different volumes correspond to different initial skeleton models in the initial skeleton model set; a first screening unit 1902 screens the initial skeleton model set based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model to obtain a first screening result, wherein the first screening result is an initial skeleton model whose first attribute information meets the first attribute information threshold; a second screening unit 1903 screens the first screening result based on the second attribute information of both the intake system and the exhaust system of the combustion system in the first screening result to obtain a second screening result, wherein the second screening result is the first screening result whose second attribute information meets the second attribute information threshold; a second determination unit 1904 determines the target skeleton model of the combustion system from the second screening result based on the shape of the guide surface in the combustion system, thereby solving the technical problem of low accuracy in skeleton determination of the combustion system and achieving the technical effect of improving the accuracy in skeleton determination of the combustion system.

[0182] According to an embodiment of the present invention, a computer-readable storage medium is also provided, the storage medium including a stored program, wherein the program executes the skeleton determination method of the combustion system in the engine in the above embodiment.

[0183] According to an embodiment of the present invention, a processor is further provided, the processor being used to run a program, wherein when the program is run, the method for determining a skeleton of a combustion system in an engine in the above embodiment is executed.

[0184] The embodiment of the present application also provides a computer program product. Optionally, in the present embodiment, the computer program product may include a computer program, and when the computer program is executed by a processor, the method for determining the skeleton of the combustion system in the engine of the embodiment of the present application is implemented.

[0185] According to an embodiment of the present invention, a vehicle is also provided. The vehicle is used to execute the skeleton determination method of the combustion system in the engine according to the embodiment of the present invention.

[0186] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0187] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0188] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0189] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0190] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, Read-Only Memory (ROM), Random Access Memory (RAM), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0191] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining the skeleton of a combustion system in an engine, characterized in that: include: Acquire a volume image of a cylinder head combustion chamber in a combustion system of an engine, and determine an initial skeleton model set of the combustion system based on the volume image, wherein the volume image is used to represent the change result of the volume of the cylinder head combustion chamber under different roof angles and different roof heights, and different volumes correspond to different initial skeleton models in the initial skeleton model set; Based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, the initial skeleton model set is screened to obtain a first screening result, wherein the first screening result is the initial skeleton model whose first attribute information satisfies a first attribute information threshold; Based on the second attribute information of the intake system and the exhaust system of the combustion system in the first screening result, the first screening result is screened to obtain a second screening result, wherein the second screening result is the first screening result in which the second attribute information satisfies the second attribute information threshold value; Based on the shape of the guide surface in the combustion system, a target skeleton model of the combustion system is determined from the second screening result.

2. The method according to claim 1, characterized in that Determining an initial skeleton model set of the combustion system based on the volume image includes: Filtering out a volume band of the cylinder head combustion chamber from the volume image, wherein the volume band is used to represent a volume range that meets a displacement requirement and a compression ratio requirement; Based on the volume band, the initial skeleton model set is determined.

3. The method according to claim 2, characterized in that The intake system includes an intake seat ring, and the exhaust system includes an exhaust seat ring, wherein the volume band of the cylinder head combustion chamber is screened out from the volume image, comprising: Filtering the volume band from the volume image based on the volume proportion of the cylinder head combustion chamber and the compression ratio and stroke of the engine; Determining the initial skeleton model set based on the volume band includes: The initial skeleton model set is determined based on the volume in the volume band, the seat ring attributes corresponding to the intake seat ring and the exhaust seat ring respectively, and the depth change of the valve avoidance pit, wherein the seat ring attributes include at least the sealing surface thickness of the intake seat ring or the exhaust seat ring, the thickness of the wall between the bottom hole of the intake seat ring or the exhaust seat ring and the mounting hole of the spark plug in the combustion system, the thickness of the wall of the intake seat ring or the exhaust seat ring, and the height of the intake seat ring or the exhaust seat ring.

4. The method according to claim 1, characterized in that: Based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model, the initial skeleton model set is screened to obtain a first screening result, including: Obtaining the angle range of the intake angle and the exhaust angle of the engine, and the eccentricity range of the spark plug in the combustion system; Based on the angle range, determining the angle variation range of the intake angle and the exhaust angle, and the roof height variation range; Based on the angle variation range, the roof height variation range and the eccentricity range, the initial skeleton model is screened to obtain the first screening result.

5. The method according to claim 4, characterized in that The first attribute information includes depth information of the valve avoidance pit and distance information between the valve avoidance pit and the first air ring of the engine, and the first attribute information threshold includes a depth information threshold and a distance information threshold. The initial skeleton model is screened based on the angle variation range, the roof height variation range and the eccentricity range to obtain the first screening result, including: Taking the angle variation range, the ceiling height variation range and the eccentricity range as variables, the initial skeleton model is screened based on whether the depth information is less than or equal to the depth information threshold, and whether the distance information is greater than or equal to the distance information threshold, to obtain the first screening result.

6. The method according to claim 1, characterized in that Based on the second attribute information of the intake system and the exhaust system of the combustion system in the first screening result, the first screening result is screened to obtain a second screening result, including: Based on the constraint conditions and variable information set by the second attribute information, the first screening result is screened to obtain the second screening result so that the volume of the cylinder head combustion chamber is less than a volume threshold.

7. The method according to claim 6, characterized in that The intake system includes an intake seat ring, an intake valve and an intake duct, and the exhaust system includes an exhaust seat ring and an exhaust valve. The constraints include at least the thickness of the intake seat ring's partition wall, the thickness of the exhaust seat ring's partition wall, the distance between the intake valve and the cylinder barrel of the engine when the intake valve moves, the distance between the exhaust valve and the cylinder barrel when the exhaust valve moves, and the thickness of the partition wall between the intake duct and the water jacket of the engine. The variable information includes at least the angle of the intake valve, the angle of the exhaust valve, the sealing surface diameter of the intake seat ring, and the sealing surface diameter of the exhaust seat ring.

8. A device for determining the framework of a combustion system in an engine, characterized in that: include: A first determination unit is used to obtain a volume image of a cylinder head combustion chamber in a combustion system of an engine, and determine an initial skeleton model set of the combustion system based on the volume image, wherein the volume image is used to represent a change result of the volume of the cylinder head combustion chamber at different roof angles and different roof heights, and different volumes correspond to different initial skeleton models in the initial skeleton model set; A first screening unit is used to screen the initial skeleton model set based on the first attribute information of the valve avoidance pit of the combustion system in the initial skeleton model to obtain a first screening result, wherein the first screening result is the initial skeleton model whose first attribute information meets a first attribute information threshold; A second screening unit is used to screen the first screening result based on the second attribute information of the intake system and the exhaust system of the combustion system in the first screening result to obtain a second screening result, wherein the second screening result is the first screening result in which the second attribute information meets the second attribute information threshold; A second determining unit is used to determine a target skeleton model of the combustion system from the second screening result based on the shape of the guide surface in the combustion system.

9. A processor, characterized in that: The processor is used to run a program, wherein the program, when run by the processor, executes the skeleton determination method of the combustion system in the engine as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the skeleton determination method of the combustion system in the engine as described in any one of claims 1 to 7.

11. An electronic device, characterized in that: It comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the skeleton determination method of the combustion system in the engine as claimed in any one of claims 1 to 7.

12. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the skeleton determination method of a combustion system in an engine according to any one of claims 1 to 7.

13. A vehicle, characterized in that: Used to execute the skeleton determination method of the combustion system in the engine as described in any one of claims 1 to 7.

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