Methods, devices, electronic equipment, and storage media for determining the compression ratio of an engine

Abstract

Embodiments of this application disclose a method, apparatus, device, and storage medium for determining the compression ratio of an engine. The method includes: acquiring the structure of a variable compression ratio engine, the structure including an adjustable transmission mechanism and a fixed transmission mechanism; acquiring the geometric features and transmission parameters of the adjustable transmission mechanism; performing dimensional synthesis on the adjustable transmission mechanism based on the geometric features and transmission parameters to obtain a dimensional synthesis result; and determining a functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the dimensional synthesis result, the functional relationship being used to determine the compression ratio of the variable compression ratio engine. Embodiments of this application not only achieve accurate calculation of the engine's compression ratio but also achieve precise control over the engine's compression ratio range.

Description

Technical Field

[0001] This application relates to the field of engine control technology, specifically to a method, apparatus, electronic device, and computer-readable storage medium for determining the compression ratio of an engine. Background Technology

[0002] With technological advancements, traditional automotive engines, especially gasoline engines, are typically designed with high thermal efficiency and no knocking under heavy loads in mind. However, when a vehicle is operating under low power loads, the engine's intake air volume is small, resulting in an actual compression ratio lower than the geometric compression ratio, and consequently, lower thermal efficiency than designed. In recent years, to address knocking and improve engine thermal efficiency, a common technical solution is to employ variable compression ratios. This allows the engine to maintain a higher compression ratio under low load conditions, while adjusting the compression ratio under high load conditions to control excessively high in-cylinder gas pressure, thus preventing knocking and improving thermal efficiency.

[0003] However, existing methods for dimensional synthesis of variable compression ratio engines suffer from incompleteness and lack of transparency, significantly limiting their application. Therefore, how to perform dimensional synthesis of variable compression ratio engine mechanisms while simultaneously meeting the requirements for transmission angle and total rotational speed is a pressing issue. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a method and apparatus for determining the compression ratio of an engine, an electronic device, and a computer-readable storage medium.

[0005] According to one aspect of the embodiments of this application, a method for determining the compression ratio of an engine is provided, comprising: acquiring the structure of a variable compression ratio engine, the structure including an adjustable transmission mechanism and a fixed transmission mechanism; acquiring the geometric features and transmission parameters of the adjustable transmission mechanism; performing dimensional synthesis on the adjustable transmission mechanism based on the geometric features and the transmission parameters to obtain a dimensional synthesis result; and determining a functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the dimensional synthesis result, the functional relationship being used to determine the compression ratio of the variable compression ratio engine.

[0006] According to one aspect of the embodiments of this application, the adjustable transmission mechanism includes a crank-rocker mechanism. The step of performing dimensional synthesis on the adjustable transmission mechanism based on the geometric features and the transmission parameters to obtain a dimensional synthesis result includes: determining the minimum transmission angle of the crank-rocker mechanism based on the geometric features corresponding to the crank-rocker mechanism; and determining the dimensional synthesis result of the crank-rocker mechanism based on the transmission parameters of the crank-rocker mechanism at the minimum transmission angle of the crank-rocker mechanism.

[0007] According to one aspect of the embodiments of this application, the crank-rocker mechanism includes a crank and a frame, and the method further includes: determining the minimum transmission angle of the crank-rocker mechanism based on the positional relationship between the crank and the frame in the crank-rocker mechanism; obtaining a preset configuration safety factor of the crank-rocker mechanism, and determining the dimensional comprehensive result of the crank-rocker mechanism based on the preset configuration safety factor and the minimum transmission angle of the crank-rocker mechanism.

[0008] According to one aspect of the present application, determining the minimum transmission angle of the crank-rocker mechanism based on the positional relationship between the crank and the frame in the crank-rocker mechanism includes: establishing a first relationship based on the motion parameters corresponding to when the crank and the frame are collinear; establishing a second relationship based on the motion parameters corresponding to when the crank and the frame coincide; and determining the minimum transmission angle of the crank-rocker mechanism based on the first relationship and the second relationship.

[0009] According to one aspect of the embodiments of this application, the adjustable transmission mechanism further includes a rocker-slider mechanism, the rocker-slider mechanism including a slider and a rocker, and the method further includes: determining the return limit position transmission angle corresponding to the rocker-slider mechanism based on the geometric relationship between the slider and the rocker; taking the return limit position transmission angle as the minimum transmission angle corresponding to the rocker-slider mechanism; obtaining a preset structural safety factor of the rocker-slider mechanism, and determining the comprehensive dimensional result of the rocker-slider mechanism based on the preset structural safety factor and the minimum transmission angle.

[0010] According to one aspect of the embodiments of this application, the method further includes: obtaining the transmission relationship between the rocker-slider mechanism and the crank-rocker mechanism; and constructing the motion equation corresponding to the adjustable transmission mechanism based on the transmission relationship, the dimensional synthesis result of the crank-rocker mechanism, and the dimensional synthesis result of the rocker-slider mechanism.

[0011] According to one aspect of the embodiments of this application, determining the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the scale synthesis result includes: obtaining real-time position information of the piston of the engine at the current moment, wherein the piston is disposed in the fixed transmission mechanism and is connected to the adjustable transmission mechanism in a transmission manner; determining the functional relationship between the position information ratio of the piston and the position of the adjustable transmission mechanism based on the real-time position information and the motion equation of the adjustable transmission mechanism, wherein the position information of the piston is used to determine the compression ratio of the variable compression ratio engine.

[0012] According to one aspect of the embodiments of this application, an engine compression ratio determination apparatus is provided, the apparatus comprising: a first acquisition module for acquiring the structure of a variable compression ratio engine, the structure including an adjustable transmission mechanism and a fixed transmission mechanism; a second acquisition module for acquiring the geometric features and transmission parameters of the adjustable transmission mechanism; a scale synthesis module for performing scale synthesis on the adjustable transmission mechanism based on the geometric features and the transmission parameters to obtain a scale synthesis result; and a determination module for determining a functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the scale synthesis result, the functional relationship being used to determine the compression ratio of the variable compression ratio engine.

[0013] According to one aspect of the embodiments of this application, an electronic device is provided, including: one or more processors; and a storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the engine compression ratio determination method as described above.

[0014] According to one aspect of the embodiments of this application, a computer-readable storage medium is provided, on which computer-readable instructions are stored, which, when executed by a computer processor, cause the computer to perform the engine compression ratio determination method as described above.

[0015] In the technical solution provided in the embodiments of this application, the adjustable transmission mechanism is dimensionally synthesized by the geometric features and transmission parameters of the variable transmission mechanism in the structure of the variable compression ratio engine to obtain the dimensional synthesis result. Then, by analyzing the adjustable transmission mechanism, the dimensional synthesis of the engine mechanism is made more complete and effective. In this way, the compression ratio of the variable compression ratio engine can be determined according to the functional relationship between the dimensional synthesis result of the adjustable transmission mechanism and the position of the fixed transmission mechanism. This not only achieves accurate calculation of the engine's compression ratio, but also achieves precise control of the engine's compression ratio range.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0018] Figure 1This is a schematic diagram illustrating an implementation environment for determining the compression ratio of an engine, as shown in an exemplary embodiment of this application.

[0019] Figure 2 This is a flowchart illustrating an exemplary embodiment of the method for determining the compression ratio of an engine, as shown in this application.

[0020] Figure 3 This is a simplified structural schematic diagram of an engine shown in an exemplary embodiment of this application;

[0021] Figure 4 This is a flowchart illustrating a method for determining the compression ratio of an engine, as shown in another exemplary embodiment of this application;

[0022] Figure 5 This is a simplified structural schematic diagram of a crank-rocker mechanism shown in an exemplary embodiment of this application;

[0023] Figure 6 This is a flowchart illustrating a method for determining the compression ratio of an engine, as shown in another exemplary embodiment of this application;

[0024] Figure 7 This is a schematic diagram of a crank-rocker mechanism undergoing geometric transformation, as shown in an exemplary embodiment of this application.

[0025] Figure 8 This is another exemplary embodiment illustrating the corresponding functional relationship between the connecting rods during the transformation process of the crank-rocker mechanism;

[0026] Figure 9 This is a flowchart illustrating a method for determining the compression ratio of an engine, as shown in another exemplary embodiment of this application;

[0027] Figure 10 This is a flowchart illustrating a method for determining the compression ratio of an engine, as shown in another exemplary embodiment of this application;

[0028] Figure 11 This is a dimensional analysis schematic diagram of a rocker-slider mechanism shown in an exemplary embodiment of this application;

[0029] Figure 12 This is a flowchart illustrating a method for determining the compression ratio of an engine, as shown in another exemplary embodiment of this application;

[0030] Figure 13 This is a flowchart illustrating a method for determining the compression ratio of an engine, as shown in another exemplary embodiment of this application;

[0031] Figure 14 This is a schematic diagram of the dimensional analysis of an adjustable transmission mechanism shown in an exemplary embodiment of this application;

[0032] Figure 15 This is a schematic diagram illustrating the relationship between an engine compression ratio and an adjustable transmission mechanism, as shown in an exemplary embodiment of this application.

[0033] Figure 16 This is a simplified flowchart illustrating an engine compression ratio determination method according to an exemplary embodiment of this application;

[0034] Figure 17 This is a block diagram illustrating an engine compression ratio determining device according to an exemplary embodiment of this application;

[0035] Figure 18 A schematic diagram of the structure of a computer system suitable for implementing the electronic device of the present application is shown. Detailed Implementation

[0036] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0037] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0038] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily need to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0039] In this application, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0040] First, it's important to understand that a variable compression ratio engine is an advanced engine technology. Its key feature is that it's not limited to a fixed compression ratio but can be adjusted according to actual needs. The principle behind a variable compression ratio engine is primarily to adjust the engine's compression ratio by changing the piston's position at bottom dead center (BDC) in the cylinder. The piston's position determines the engine's compression ratio; as the piston moves up and down in the cylinder, the volume from the piston to the top of the cylinder changes accordingly. The ratio of the volume at the piston's lowest and highest points is the engine's compression ratio. Variable compression ratio technology has a wide range of potential applications, especially in high-power engines where it can bring significant economic benefits. For example, the benefits are even more pronounced in naturally aspirated or turbocharged direct injection (DFI) and variable valve control (VVA) engines. Furthermore, combining VCR and VVA variable valve control systems can achieve even greater fuel economy and engine environmental benefits.

[0041] Compression ratio is one of the fundamental specifications of an internal combustion engine. The compression ratio of an internal combustion engine represents the ratio of the engine's combustion chamber volume from its maximum capacity to its minimum capacity. In reciprocating internal combustion engines, the compression ratio is typically defined as the ratio between the cylinder and combustion chamber volume when the piston is at the bottom of its stroke and the combustion chamber volume when the piston is at the top of its stroke. The compression ratio of an internal combustion engine has a significant impact on the engine's torque output and fuel efficiency.

[0042] Figure 1 This is a schematic diagram illustrating an implementation environment for determining the compression ratio of an engine, as shown in an exemplary embodiment of this application. Figure 1 As shown, the structure of a variable compression ratio engine can be obtained through terminal 110. The structure of the variable compression ratio engine includes an adjustable transmission mechanism and a fixed transmission mechanism. The obtained structure of the variable compression ratio engine is then sent to server 120. Server 120 obtains the geometric features and corresponding transmission parameters of the adjustable transmission mechanism. Based on the geometric features and transmission parameters of the adjustable mechanism, it performs dimensional synthesis on the adjustable transmission mechanism to obtain the corresponding dimensional synthesis result. Then, based on the dimensional synthesis result of the adjustable mechanism, it determines the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism of the engine. This functional relationship can be used to determine the compression ratio of the variable engine.

[0043] in, Figure 1 The terminal 110 shown can be any terminal device that supports the installation of navigation map software, such as a smartphone, in-vehicle computer, tablet computer, laptop computer, or wearable device, but is not limited to these. Figure 1The server 120 shown can be, for example, a standalone physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms. No restrictions are placed on this. The terminal 110 can communicate with the server 120 via wireless networks such as 3G (third-generation mobile information technology), 4G (fourth-generation mobile information technology), and 5G (fifth-generation mobile information technology). No restrictions are placed on this as well.

[0044] With technological advancements, traditional automotive engines, especially gasoline engines, are typically designed with high thermal efficiency and no knocking under heavy loads in mind. However, when a vehicle is operating under low power loads, the engine's intake air volume is small, resulting in an actual compression ratio lower than the geometric compression ratio, and consequently, lower thermal efficiency than designed. In recent years, to address knocking and improve engine thermal efficiency, a common technical solution is to employ variable compression ratios. This allows the engine to maintain a higher compression ratio under low load conditions, while adjusting the compression ratio under high load conditions to control excessively high in-cylinder gas pressure, thus preventing knocking and improving thermal efficiency.

[0045] However, existing methods for dimensional synthesis of variable compression ratio engines suffer from incompleteness and lack of transparency, significantly limiting their application. Therefore, how to perform dimensional synthesis of variable compression ratio engine mechanisms while simultaneously meeting the requirements for transmission angle and total rotational speed is a pressing issue.

[0046] To address these issues, embodiments of this application propose an engine compression ratio method, an engine compression ratio device, an electronic device, a computer-readable storage medium, and a computer program product, which will be described in detail below.

[0047] Please see Figure 2 , Figure 2 This is a flowchart illustrating the compression ratio of an engine, as shown in an exemplary embodiment of this application. The method can be applied to... Figure 1 The implementation environment shown is specifically executed by server 120 within that implementation environment. It should be understood that this method can also be applied to other exemplary implementation environments and executed by devices in other implementation environments; this embodiment does not limit the implementation environment to which the method is applicable.

[0048] like Figure 2As shown, in an exemplary embodiment, the specific implementation process of the engine compression ratio determination method includes at least steps S210 to S240, which are described in detail below:

[0049] Step S210: Obtain the structure of the variable compression ratio engine, which includes an adjustable transmission mechanism and a fixed transmission mechanism.

[0050] First, it should be noted that, as Figure 3 As shown, Figure 3 A simplified structural diagram of a variable compression ratio engine is shown, as follows: Figure 3 As shown, a variable compression ratio engine generally consists of two main parts: an adjustable transmission mechanism and a fixed transmission mechanism. The adjustable transmission mechanism is the primary part of the engine responsible for changing the compression ratio. It may include various complex mechanical, hydraulic, or electronic systems used to adjust the piston stroke or cylinder volume during engine operation, thereby changing the compression ratio. This adjustment can be made according to various factors such as engine load, speed, and fuel type to achieve higher efficiency, better fuel economy, and lower emissions. The fixed transmission mechanism includes the engine block, crankshaft, connecting rods, valve mechanism, etc. These components remain relatively fixed during engine operation and do not directly participate in the adjustment of the compression ratio. These fixed structural parts provide the basic framework and mechanical movement of the engine, which is the foundation for the engine to function properly.

[0051] Step S220: Obtain the geometric features and transmission parameters of the adjustable transmission mechanism.

[0052] Specifically, the design parameters of the adjustable transmission mechanism of the variable compression ratio engine can be obtained, and the geometric characteristics and transmission parameters of the adjustable transmission mechanism can be determined. The transmission parameters may include the initial compression ratio, initial transmission angle, minimum transmission angle range, and initial distance between the crankshaft frame and the adjusting components of the variable compression ratio engine.

[0053] For example, in some feasible embodiments, the geometric features of the adjustable transmission mechanism include a linkage system, a slider mechanism, a variable valve control system, etc. In some designs, although the variable valve control system (VVA) does not directly adjust the compression ratio, it can indirectly affect the compression effect by changing the timing and degree of valve opening and closing, thereby affecting the pressure change in the cylinder. The transmission parameters include the compression ratio range, adjustment speed, and transmission efficiency of the transmission system.

[0054] Step S230: Perform dimensional synthesis on the adjustable transmission mechanism based on geometric features and transmission parameters to obtain the dimensional synthesis result.

[0055] Specifically, based on the determined geometric features and corresponding transmission parameters of the adjustable transmission mechanism of the variable compression ratio engine, dimensional synthesis is performed on the adjustable transmission mechanism. The dimensional synthesis process may include: determining the decision variables that need to be optimized in the adjustable transmission mechanism, such as connecting rod length and slider angle; setting the optimization objective function according to the design objectives, such as minimizing transmission loss and maximizing the compression ratio range; selecting appropriate optimization design methods, such as analytical methods, geometric methods, and function approximation methods; or using simulation software to perform kinematic and dynamic simulation analysis on the adjustable transmission mechanism; iteratively improving the optimization design based on the simulation analysis results; and finally obtaining the dimensional synthesis result of the adjustable transmission mechanism that meets the design requirements.

[0056] For example, the geometry, size, and connection method of each component in the adjustable transmission mechanism can be determined according to the design objectives. Then, the compression ratio range and key transmission parameters such as adjustment speed of the adjustable transmission mechanism can be determined. Based on the geometric characteristics and transmission parameters of the mechanism, a mathematical model can be established to describe the kinematic and dynamic characteristics of the mechanism. Finally, the dimensional comprehensive result of the adjustable transmission mechanism that meets the design requirements can be obtained.

[0057] Step S240: Based on the dimensional synthesis results, determine the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism. The functional relationship is used to determine the compression ratio of the variable compression ratio engine.

[0058] Specifically, following step S210 above, in the structure of a variable compression ratio engine, the adjustable transmission mechanism and the fixed transmission mechanism are connected by transmission. Therefore, the functional relationship between the fixed transmission mechanism and the external adjustable transmission mechanism in the variable compression ratio engine can be determined by the dimensional synthesis result of the adjustable transmission mechanism, and the compression ratio of the variable compression ratio engine can also be determined based on this functional relationship.

[0059] For example, in the design of a variable compression ratio engine, determining the functional relationship between the positions of the fixed and adjustable transmission mechanisms is crucial for precise control of the compression ratio. This functional relationship is typically derived from mathematical models or experimental data, based on the geometry and transmission parameters of the mechanisms. The adjustable transmission mechanism, which changes the piston stroke via a movable slider, thereby altering the compression ratio, has a functional relationship between the slider's position and the compression ratio.

[0060] In this embodiment, the adjustable transmission mechanism is dimensionally synthesized by the geometric features and transmission parameters of the variable transmission mechanism in the structure of the variable compression ratio engine. The dimensional synthesis result is obtained, and then the dimensional synthesis of the engine mechanism is made more complete and effective by analyzing the adjustable transmission mechanism. Then, the compression ratio of the variable compression ratio engine can be determined according to the functional relationship between the dimensional synthesis result of the adjustable transmission mechanism and the position of the fixed transmission mechanism, thereby realizing the accurate calculation of the engine's compression ratio and the precise control of the engine's compression ratio range.

[0061] Furthermore, based on the above embodiments, please refer to... Figure 4 In one exemplary embodiment provided in this application, the adjustable transmission mechanism includes a crank-rocker mechanism. The specific implementation process of performing dimensional synthesis on the adjustable transmission mechanism based on geometric features and transmission parameters to obtain the dimensional synthesis result may further include steps S410 and S420, which are described in detail below:

[0062] Step S410: Determine the minimum transmission angle of the crank-rocker mechanism based on the geometric features corresponding to the crank-rocker mechanism.

[0063] First, it should be noted that, as Figure 5 As shown, Figure 5 This is a schematic diagram illustrating the pressure angle and transmission angle of a crank rocker mechanism according to an exemplary embodiment of this application, as shown below. Figure 5 As shown, the pressure angle is the complementary angle of the transmission angle, and when crank AB rotates, the force exerted by connecting rod BC on rocker arm CD is P. Clearly, the larger the transmission angle, the greater the component force driving the rocker arm. The larger the pressure angle (or the greater the force transmitted from rocker arm CD to connecting rod BC), the better the force transmission performance of the mechanism. Therefore, the pressure angle and transmission angle are often used as indicators to evaluate the transmission performance of crank-rocker mechanisms. Since the pressure angle and transmission angle are constantly changing during the operation of the crank-rocker mechanism, the minimum value of the transmission angle during the entire operation of the mechanism is usually used. As a parameter for evaluating the transmission performance of crank-rocker mechanisms.

[0064] Therefore, based on the characteristics of the crank-rocker mechanism, it can be known that when the crank-rocker mechanism is in a concentric position (extreme position angle is 0°), the minimum transmission angle is... It has the highest maximum force transmission performance and the best overall performance. Furthermore, the mechanism does not exhibit quick-return characteristics (quick-return characteristics refer to the difference in average speed between the outward and return strokes of the driven rocker arm when the driving crank rotates at a constant speed), consistent with traditional engines.

[0065] Therefore, the design of the crank rocker arm dimensions in the adjustable transmission mechanism is based on the minimum transmission angle. When the initial compression ratio position is reached, the adjustable transmission mechanism is in a centered state. When the compression ratio increases or decreases, the adjustable transmission mechanism is approximately centered, which is beneficial to the smooth operation of the engine crank.

[0066] Step S420: Under the minimum transmission angle of the crank-rocker mechanism, determine the dimensional synthesis result of the crank-rocker mechanism based on the transmission parameters of the crank-rocker mechanism.

[0067] Specifically, after determining the minimum transmission angle of the crank remote sensing mechanism, the comprehensive dimensional result of the crank-rocker mechanism can be determined based on the transmission parameters and geometric characteristics of the crank-rocker mechanism at the minimum transmission angle.

[0068] In this embodiment, by disassembling the adjustable transmission mechanism, the minimum transmission angle of the crank-rocker mechanism with degrees of freedom in the adjustable transmission mechanism is calculated, so as to determine the dimensional synthesis result of the crank-rocker mechanism under the minimum transmission angle, and thus determine the dimensional transformation caused by the positional transformation of the crank-rocker mechanism.

[0069] Furthermore, based on the above embodiments, please refer to... Figure 6 In one exemplary embodiment provided in this application, the crank-rocker mechanism includes a crank and a frame. The specific implementation process of the engine compression ratio determination method may further include steps S610 and S620, which are described in detail below:

[0070] Step S610: Determine the minimum transmission angle of the crank-rocker mechanism based on the positional relationship between the crank and the frame in the crank-rocker mechanism.

[0071] Specifically, in a crank-rocker mechanism, the minimum transmission angle typically occurs at one of the two extreme positions where the crank and connecting rod are collinear. This depends on the direction of crank rotation and the connection method between the connecting rod and the rocker arm. In a crank-rocker mechanism, the minimum transmission angle occurs when the crank coincides with or is collinear with the frame. For example... Figure 7 As shown, when AB coincides with AD, the transmission angle is... When AB and AD are collinear, the transmission angle is... .

[0072] Applying the Law of Cosines to the two cases of overlapping and collinear lines yields the following relationship:

[0073]

[0074]

[0075] , This can be represented by the following functional relationship:

[0076]

[0077]

[0078] Then, according to It can be obtained as follows Figure 8 As shown With the center of the circle, radius , The relation circle is obtained, and the corresponding relation expression is derived:

[0079]

[0080] in:

[0081]

[0082] Then, based on equations (1) and (2), the following functional relationship can be obtained:

[0083]

[0084] in:

[0085]

[0086] Step S620: Obtain the preset configuration safety factor of the crank-rocker mechanism, and determine the comprehensive dimensional result of the crank-rocker mechanism based on the preset configuration safety factor and the minimum transmission angle of the crank-rocker mechanism.

[0087] Specifically, to prevent installation errors from altering the type of the crank-rocker mechanism, a preset configuration safety factor can be obtained. In the design of crank-rocker mechanisms, this preset configuration safety factor is typically used to ensure that the mechanism has sufficient strength and stability under expected loads. This safety factor is usually determined based on factors such as the material properties, operating conditions, and expected lifespan of the mechanism. To determine the dimensional synthesis result of the crank-rocker mechanism based on the preset configuration safety factor and the minimum transmission angle, it is necessary to ensure that the mechanism still meets the strength and stability requirements at the minimum transmission angle position during the dimensional synthesis process. In detail, this can be achieved through mechanical analysis to determine the maximum stress and strain of the mechanism at the minimum transmission angle position, and then using the preset configuration safety factor to calculate the maximum allowable stress and strain. This is typically done by dividing the design stress or strain by the safety factor.

[0088] In this embodiment, by further disassembling the crank and frame of the crank-rocker mechanism, the minimum transmission angle of the crank-rocker mechanism is determined by the positional relationship between the crank and the frame. In order to ensure the effectiveness of the dimensional synthesis results, a configuration safety factor of the crank-rocker mechanism is introduced, thereby making the obtained dimensional synthesis results more accurate and the subsequent control of the compression ratio more precise.

[0089] Furthermore, based on the above embodiments, please refer to... Figure 9 In one exemplary embodiment provided in this application, the specific implementation process of determining the minimum transmission angle of the crank-rocker mechanism based on the positional relationship between the crank and the frame in the crank-rocker mechanism may further include steps S910 to S930, which are described in detail below:

[0090] Step S910: Establish a first relationship based on the motion parameters corresponding to the collinearity between the crank and the frame;

[0091] Step S920: Establish a second relation based on the motion parameters corresponding to the overlap between the crank and the frame;

[0092] Step S930: Determine the minimum transmission angle of the crank-rocker mechanism based on the first relation and the second relation.

[0093] Specifically, in the crank-rocker mechanism, the minimum transmission angle occurs when the crank and the frame are aligned or collinear. Therefore, based on the positional relationship between the crank and the frame when they are collinear, a first relationship can be established according to the motion parameters corresponding to the collinearity of the crank and the frame. Similarly, based on the positional relationship between the crank and the frame when they are aligned, a second relationship can be established according to the motion parameters corresponding to the collinearity of the crank and the frame. Thus, the minimum transmission angle of the crank-rocker mechanism can be determined based on the first relationship established when the crank and the frame are collinear and the second relationship established when the crank and the frame are aligned.

[0094] For example, in some implementation embodiments, by Figure 7 Know, , It can be represented as:

[0095]

[0096]

[0097] The following relationship can be obtained:

[0098]

[0099] Combining (6)-(8) and (11), we can obtain:

[0100]

[0101] Due to the four-bar linkage , , All are greater than 0, so We can obtain the following formula:

[0102]

[0103] Solving the inequality equation yields:

[0104]

[0105]

[0106] in: , The critical values ​​are for different types of four-bar linkages.

[0107] The value of and the type of four-bar linkage satisfy the following relationship:

[0108] (1) When , At that time, the mechanism was a crank-rocker mechanism.

[0109] (2) When , At that time, the mechanism was a double crank rocker mechanism.

[0110] In this design, , , To prevent changes in mechanism type due to installation errors, a mechanism configuration safety factor is used. ,but Substituting the above conditions into equations (1)-(15) and solving them, we get the following results. , , Angle .

[0111] In this embodiment, the minimum transmission angle of the crank-rocker mechanism is determined by the kinematic parameter relationship between the crank and the frame under two working conditions: collinearity or overlap. This makes the determined minimum transmission angle of the crank-rocker mechanism more accurate and effective, and consequently, makes the determined engine compression ratio more accurate.

[0112] Furthermore, based on the above embodiments, please refer to... Figure 10In one exemplary embodiment provided in this application, the adjustable transmission mechanism further includes a rocker-slider mechanism, which includes a slider and a rocker. The specific implementation process of the engine compression ratio determination method may further include steps S1010 to S1030, as detailed below:

[0113] Step S1010: Determine the return limit position transmission angle of the rocker-slider mechanism based on the geometric relationship between the slider and the rocker.

[0114] It should be noted that in a crank-rocker mechanism, the return limit position refers to the position of the rocker at or near its farthest point during its motion. This typically corresponds to the maximum or minimum rocker angle. The limit position parameters of the rocker-slider mechanism are then determined. The extreme position angle is the angle between the two positions of the driving member when the rocker and connecting rod are collinear twice during one revolution of the crank. The transmission angle is the complementary angle of the pressure angle, representing the angle between the velocity direction of the force application point on the driven member and the direction of motion of the driven member at that point. At the return limit position, the transmission angle will be the minimum value of that position.

[0115] Specifically, the geometric relationship between the slider and the rocker arm in the rocker-slider mechanism can be used to characterize the dimensions and connections between the slider and the rocker arm at the end of the rocker-slider mechanism. Thus, the return limit position transmission angle of the rocker-slider mechanism can be determined by the geometric relationship between the slider and the rocker arm.

[0116] Step S1020: The return limit position transmission angle is taken as the minimum transmission angle corresponding to the rocker slider mechanism.

[0117] Specifically, based on the design and motion analysis of the rocker-slider mechanism, the extreme position of the rocker during its return stroke is determined, which is generally the farthest point of the rocker's swing or a position near that farthest point. After determining the extreme return position, the transmission angle at that position is calculated. The transmission angle is the angle between the rocker and the connecting rod and the plane perpendicular to the direction of motion of the connecting rod and the driven member (slider). Since the transmission angle of the rocker-slider mechanism changes during motion, it is necessary to identify whether the transmission angle at the extreme return position is the minimum transmission angle. This is usually achieved by comparing the transmission angles of the mechanism at different positions.

[0118] Step S1030: Obtain the preset structural safety factor of the rocker-slider mechanism, and determine the comprehensive dimensional result of the rocker-slider mechanism based on the preset structural safety factor and the minimum transmission angle.

[0119] Specifically, the structural safety factor is a parameter used to measure the safety of a structure under expected loads. It is typically determined based on the strength of the structural materials, the expected loads, and design criteria. The minimum transmission angle is a key parameter for measuring the transmission efficiency of a rocker-slider mechanism and preventing self-locking. Therefore, during dimensional synthesis, it is necessary to ensure that the minimum transmission angle of the mechanism meets the design requirements.

[0120] For example, based on the mechanism design requirements and motion analysis, the minimum transmission angle of the mechanism at the return limit position is determined. Based on a preset structural safety factor, the dimensions of the mechanism are comprehensively optimized. This includes adjusting parameters such as the rocker arm length, connecting rod length, and slider stroke to ensure that the mechanism meets the minimum transmission angle requirement while maintaining high structural safety and stability. Furthermore, after dimensional integration, motion simulation or experimental verification of the mechanism is required to ensure that its performance under actual working conditions meets design requirements. This includes checking the mechanism's transmission efficiency, self-locking phenomenon, and structural strength.

[0121] For example, such as Figure 11 As shown, Figure 11 This is a schematic diagram of a rocker-slider mechanism shown in an exemplary embodiment of this application. In the rocker-slider mechanism, the slider is the driving member and the rocker is the driven member. The initial position is as follows: Figure 11 As shown, swing angle Symmetrical distribution; based on the structural characteristics of the rocker-slider mechanism, the return limit position transmission angle ( The supplementary angle ( ) is the minimum transmission angle of the entire rocker-slider mechanism, so the transmission angle at the return limit position is taken. As a comprehensive design indicator for the crank-rocker mechanism.

[0122] The value of the rocker-connecting rod transmission angle can follow the conventional crank-rocker mechanism design principles, and the minimum transmission angle must meet the following conditions:

[0123]

[0124] Since this design mechanism is used in the engine field and operates under high-speed and high-power conditions for extended periods, the minimum transmission angle is selected. ,so .

[0125] Take the structural safety factor ,so .

[0126] exist Figure 11 Based on the geometric relationship of the rocker-slider mechanism, the following system of equations and functional relationships can be obtained:

[0127]

[0128] Will , , Substituting into equation (16) and solving the system of equations yields... .

[0129] In this embodiment, the dimensional synthesis result of the rocker-slider mechanism corresponding to another degree of freedom in the adjustable transmission mechanism is obtained by splitting the adjustable transmission mechanism to obtain the dimensional synthesis result of the adjustable transmission mechanism separately, so that the obtained dimensional synthesis result of the adjustable transmission mechanism is more accurate and effective.

[0130] Furthermore, based on the above embodiments, please refer to... Figure 12 In one exemplary embodiment provided in this application, the specific implementation process of the above-described engine compression ratio determination method may further include steps S1210 and S1220, which are described in detail below:

[0131] Step S1210: Obtain the transmission relationship between the rocker-slider mechanism and the crank-rocker mechanism.

[0132] Step S1220: Based on the transmission relationship, the dimensional synthesis results of the crank-rocker mechanism, and the dimensional synthesis results of the rocker-slider mechanism, construct the motion equations corresponding to the adjustable transmission mechanism.

[0133] Specifically, the adjustable transmission mechanism of a variable compression ratio engine includes a crank-rocker mechanism and a rocker-slider mechanism. The rocker-slider mechanism is connected to the crank-rocker mechanism, typically via a common connecting rod or rocker arm to transmit power or motion. Assuming the rocker arm of the rocker-slider mechanism is connected to the rocker arm of the crank-rocker mechanism, the angular relationship between these two rockers constitutes the transmission relationship. This relationship can be described using geometric relationships or kinematic equations. Analysis of dimensional synthesis results: Dimensional synthesis has been performed separately for the rocker-slider mechanism and the crank-rocker mechanism, obtaining their respective dimensional parameters (such as connecting rod length, rocker arm length, and slider stroke). These parameters will be used to construct the equations of motion.

[0134] Subsequently, based on the transmission relationship and dimensional synthesis results, the motion equation of the adjustable transmission mechanism can be constructed. This equation will describe the position, velocity, or acceleration relationships between the various components of the mechanism. Assume the rocker angle of the rocker-slider mechanism is... The crank angle of the crank-rocker mechanism is The transmission relationship between the two can be expressed as: = f( ), where f is a certain functional relationship. Simultaneously, based on the dimensional synthesis results, expressions for the position, velocity, or acceleration of each component in the rocker-slider mechanism and the crank-rocker mechanism can be obtained. These expressions will serve as inputs to the equations of motion. Finally, substituting the transmission relationship f and the dimensional synthesis results into the equations of motion yields the complete equations of motion for the adjustable transmission mechanism.

[0135] Furthermore, based on the above embodiments, please refer to... Figure 13 In one exemplary embodiment provided in this application, the specific implementation process of determining the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the scale synthesis results may further include steps S1310 and S1320, which are described in detail below:

[0136] Step S1310: Obtain the real-time position information of the piston of the variable compression ratio engine at the current moment. The piston is set in the fixed transmission mechanism and is connected to the adjustable transmission mechanism.

[0137] Step S1320: Based on real-time position information and the motion equation of the adjustable transmission mechanism, determine the functional relationship between the piston position information ratio and the position of the adjustable transmission mechanism. The piston position information is used to determine the compression ratio of the variable compression ratio engine.

[0138] Specifically, the real-time position information of the piston of the variable compression ratio engine can be obtained at the current moment. The piston is set in the fixed transmission mechanism of the variable compression ratio engine, and the piston is connected to the adjustable transmission mechanism. Then, the real-time position information of the piston and the motion equation of the adjustable transmission mechanism can be combined to determine the functional relationship between the piston position information ratio and the position of the adjustable transmission mechanism. The piston position information is used to determine the compression ratio of the variable compression ratio engine.

[0139] For example, such as Figure 14 As shown, Figure 14 This is a simplified schematic diagram of a variable compression ratio engine shown in an exemplary embodiment of this application, as follows: Figure 13 As shown, when the mechanism is in its initial position, to ensure that the rocker arm swing angle is symmetrical in the horizontal direction, The initial coordinates of the point are:

[0140]

[0141]

[0142] The coordinates of the point at its upper and lower limits are: , , The initial position coordinates of the point at the upper and lower limits are: .

[0143] , The distance between them satisfies the formula:

[0144]

[0145] Will and Substituting the values ​​and solving the problem yields the following results: , .

[0146] Therefore, the initial stroke of the piston can be calculated by the following formula:

[0147]

[0148] The initial combustion chamber length is:

[0149]

[0150] The point is the cylinder top position, and its horizontal and vertical coordinates are as follows:

[0151]

[0152]

[0153] In this design, when the piston is at top dead center, the crank and connecting rod are collinear, i.e. The point is located at point The position of the piston at any given moment; the bottom dead center of the piston is when the crank and connecting rod overlap and are collinear, that is, point C is located at point... The position of the piston at any given moment. Let CD be the angle between the joystick and the negative y-axis, which can be expressed numerically as follows:

[0154]

[0155] The coordinates of point D are: We can obtain the following formula:

[0156]

[0157] when or When the piston is at top dead center or bottom dead center, the crankshaft and connecting rod are collinear, and the following equation can be obtained using the law of cosines:

[0158]

[0159]

[0160] in .

[0161] Therefore, when adjusting the adjustment mechanism, the piston is at top dead center. The coordinates of the point are ,at this time The coordinates of a point can be represented as .

[0162] When the piston is at bottom dead center The coordinates of the point are ,at this time The position coordinates of a point can be represented as .

[0163] Will and Substituting into equation (20), we can solve for:

[0164]

[0165]

[0166] Compression ratio can be expressed as:

[0167]

[0168] Will , , , , , Substituting into equation (31) and solving, we obtain the compression ratio. Adjusting the position of components The functional relationship is as follows Figure 14 As shown.

[0169] Furthermore, such as Figure 15 As shown, the compression ratio decreases as the displacement of the adjustment component increases. When the compression ratio is within the given design requirements... When the fluctuation range is within a certain range, adjust the range of change of the slider as follows: The adjustment working range for adjusting the component to its initial position is: The specific adjustment is as follows: when the drive adjustment slider moves down, the piston stroke position moves up, and the compression ratio increases; when the drive adjustment slider moves up, the piston stroke position moves down, and the compression ratio decreases.

[0170] In this embodiment, by combining the real-time position relationship of the piston of the variable compression engine with the motion equation of the adjustable transmission mechanism, a functional relationship is established. Then, the compression ratio of the engine can be determined according to the position of the piston, thereby realizing the accurate calculation of the engine compression ratio and facilitating the subsequent precise control of the engine compression ratio.

[0171] Figure 16 This is a simplified flowchart illustrating the process of determining the compression ratio of an engine in an exemplary application scenario. In the application scenario shown in Figure 16, the structure of a variable compression ratio engine is obtained, which includes an adjustable transmission mechanism and a fixed transmission mechanism. The geometric features and transmission parameters of the adjustable transmission mechanism, which includes a crank-rocker mechanism and a rocker-slider mechanism, are then obtained. Based on the geometric features of the crank-rocker mechanism, the minimum transmission angle is determined. At the minimum transmission angle, the dimensional synthesis result of the crank-rocker mechanism is determined based on its transmission parameters. The return limit position transmission angle of the rocker-slider mechanism is determined based on the geometric relationship between the slider and the rocker, and this return limit position transmission angle is taken as the minimum transmission angle of the rocker-slider mechanism. A preset structural safety factor for the rocker-slider mechanism is obtained, and the dimensional synthesis result of the rocker-slider mechanism is determined based on the preset structural safety factor and the minimum transmission angle. The transmission relationship between the rocker-slider mechanism and the crank-rocker mechanism is then obtained. Based on the transmission relationship, the dimensional synthesis result of the crank-rocker mechanism, and the dimensional synthesis result of the rocker-slider mechanism, the motion equations corresponding to the adjustable transmission mechanism are constructed. The functional relationship between the piston position information ratio and the position of the adjustable transmission mechanism is determined based on real-time position information and the motion equation of the adjustable transmission mechanism. The piston position information is used to determine the compression ratio of the variable compression ratio engine. For detailed implementation processes, please refer to the descriptions in the foregoing embodiments; they will not be repeated here.

[0172] Figure 17 This is a block diagram illustrating an engine compression ratio determining device according to an exemplary embodiment of this application. This device can be applied to... Figure 1 The implementation environment shown is specifically configured in server 120. This device can also be applied to other exemplary implementation environments and specifically configured in other devices. This embodiment does not limit the implementation environment to which this device is applicable.

[0173] like Figure 17 As shown, the exemplary engine compression ratio determination device includes: a first acquisition module 1710 for acquiring the structure of a variable compression ratio engine, the structure including an adjustable transmission mechanism and a fixed transmission mechanism; a second acquisition module 1720 for acquiring the geometric features and transmission parameters of the adjustable transmission mechanism; a scale synthesis module 1730 for performing scale synthesis on the adjustable transmission mechanism based on the geometric features and transmission parameters to obtain a scale synthesis result; and a determination module 1740 for determining the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the scale synthesis result, the functional relationship being used to determine the compression ratio of the variable compression ratio engine.

[0174] According to one aspect of the embodiments of this application, the above-mentioned scale synthesis module 1730 is further configured to determine the minimum transmission angle of the crank-rocker mechanism based on the geometric features corresponding to the crank-rocker mechanism; and under the minimum transmission angle of the crank-rocker mechanism, determine the scale synthesis result of the crank-rocker mechanism based on the transmission parameters of the crank-rocker mechanism.

[0175] According to one aspect of the embodiments of this application, the compression ratio determination device of the engine further includes: a first determination module, used to determine the minimum transmission angle of the crank-rocker mechanism based on the positional relationship between the crank and the frame in the crank-rocker mechanism; and a second determination module, used to obtain a preset configuration safety factor of the crank-rocker mechanism, and determine the comprehensive dimensional result of the crank-rocker mechanism based on the preset configuration safety factor and the minimum transmission angle of the crank-rocker mechanism.

[0176] According to one aspect of the embodiments of this application, the first determining module is further specifically used to: establish a first relationship based on the motion parameters corresponding to when the crank and the frame are collinear; establish a second relationship based on the motion parameters corresponding to when the crank and the frame coincide; and determine the minimum transmission angle of the crank-rocker mechanism based on the first relationship and the second relationship.

[0177] According to one aspect of the embodiments of this application, the compression ratio determination device for the engine further includes: a third determining module, used to determine the return limit position transmission angle corresponding to the rocker-slider mechanism based on the geometric relationship between the slider and the rocker; a fourth determining module, used to take the return limit position transmission angle as the minimum transmission angle corresponding to the rocker-slider mechanism; and a fifth determining module, used to obtain a preset structural safety factor of the rocker-slider mechanism, and determine the comprehensive dimensional result of the rocker-slider mechanism based on the preset structural safety factor and the minimum transmission angle.

[0178] According to one aspect of the embodiments of this application, the compression ratio determination module of the engine further includes: a third acquisition module, used to acquire the transmission relationship between the rocker-slider mechanism and the crank-rocker mechanism; and a construction module, used to construct the motion equation corresponding to the adjustable transmission mechanism based on the transmission relationship, the dimensional synthesis result of the crank-rocker mechanism, and the dimensional synthesis result of the rocker-slider mechanism.

[0179] According to one aspect of the embodiments of this application, the determination module 1740 is specifically used to obtain the real-time position information of the piston of the variable compression ratio engine at the current moment. The piston is disposed in a fixed transmission mechanism and is connected to an adjustable transmission mechanism. Based on the real-time position information and the motion equation of the adjustable transmission mechanism, the functional relationship between the piston position information ratio and the position of the adjustable transmission mechanism is determined. The piston position information is used to determine the compression ratio of the variable compression ratio engine.

[0180] It should be noted that the engine compression ratio determination device and the engine compression ratio determination method provided in the above embodiments belong to the same concept. The specific operation methods of each module and unit have been described in detail in the method embodiments and will not be repeated here. In practical applications, the engine compression ratio determination device provided in the above embodiments can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. This is not a limitation here.

[0181] Embodiments of this application also provide an electronic device, including: one or more processors; and a storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the engine compression ratio determination method provided in the above embodiments.

[0182] Figure 18 A schematic diagram of a computer system suitable for implementing the embodiments of this application is shown. It should be noted that... Figure 18 The computer system 1800 of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0183] like Figure 18 As shown, the computer system 1800 includes a Central Processing Unit (CPU) 1801, which can perform various appropriate actions and processes, such as executing the methods described in the above embodiments, based on programs stored in Read-Only Memory (ROM) 1802 or programs loaded from storage portion 1808 into Random Access Memory (RAM) 1803. The RAM 1803 also stores various programs and data required for system operation. The CPU 1801, ROM 1802, and RAM 1803 are interconnected via a bus 1804. An Input / Output (I / O) interface 1805 is also connected to the bus 1804.

[0184] The following components are connected to I / O interface 1805: an input section 1806 including a keyboard, mouse, etc.; an output section 1807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1808 including a hard disk, etc.; and a communication section 1809 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 1809 performs communication processing via a network such as the Internet. A drive 1810 is also connected to I / O interface 1805 as needed. Removable media 1811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1810 as needed so that computer programs read from them can be installed into storage section 1808 as needed.

[0185] Specifically, according to embodiments of this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program including a computer program for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1809, and / or installed from removable medium 1811. When the computer program is executed by central processing unit (CPU) 1801, it performs various functions defined in the system of this application.

[0186] It should be noted that the computer-readable medium shown in the embodiments of this application can be a computer-readable signal medium or a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying a computer-readable computer program. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media can also be any computer-readable medium other than computer-readable storage media, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0187] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0188] The units described in the embodiments of this application can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0189] Another aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned method for determining the compression ratio of an engine. This computer-readable storage medium may be included in the electronic device described in the above embodiments, or it may exist independently without being assembled into that electronic device.

[0190] Another aspect of this application provides a computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computer device to perform the engine compression ratio determination method provided in the various embodiments described above.

[0191] The above description is merely a preferred exemplary embodiment of this application and is not intended to limit the implementation of this application. Those skilled in the art can easily make corresponding modifications or alterations based on the main concept and spirit of this application. Therefore, the scope of protection of this application should be determined by the scope of protection claimed in the claims.

Claims

1. A method for determining the compression ratio of an engine, characterized in that, include: A structure for a variable compression ratio engine is obtained, the structure including an adjustable transmission mechanism and a fixed transmission mechanism; the adjustable transmission mechanism includes a crank-rocker mechanism and a rocker-slider mechanism; Obtain the geometric features and transmission parameters of the adjustable transmission mechanism; The adjustable transmission mechanism is subjected to dimensional synthesis based on the geometric features and the transmission parameters to obtain the dimensional synthesis result; the dimensional synthesis result includes the dimensional synthesis result of the crank-rocker mechanism and the dimensional synthesis result of the rocker-slider mechanism; Based on the scale synthesis results, the motion equation of the adjustable transmission mechanism is determined, and based on the motion equation of the adjustable transmission mechanism, the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism is determined. The functional relationship is used to determine the compression ratio of the variable compression ratio engine. The method further includes: determining the transmission relationship based on the rocker angle of the rocker-slider mechanism and the crank angle of the crank-rocker mechanism; and obtaining expressions for the position, velocity, or acceleration of each component in the rocker-slider mechanism and the crank-rocker mechanism based on the dimensional synthesis results of the crank-rocker mechanism and the dimensional synthesis results of the rocker-slider mechanism, wherein the expressions will be used as inputs to the motion equations. Substituting the transmission relationship, the dimensional synthesis results of the crank-rocker mechanism, and the dimensional synthesis results of the rocker-slider mechanism into the motion equation, the complete motion equation of the adjustable transmission mechanism is obtained.

2. The method as described in claim 1, characterized in that, The dimensional synthesis of the adjustable transmission mechanism based on the geometric features and the transmission parameters, to obtain the dimensional synthesis result, includes: The minimum transmission angle of the crank-rocker mechanism is determined based on the geometric features corresponding to the crank-rocker mechanism; At the minimum transmission angle of the crank-rocker mechanism, the overall dimensional result of the crank-rocker mechanism is determined based on the transmission parameters of the crank-rocker mechanism.

3. The method as described in claim 2, characterized in that, The crank-rocker mechanism includes a crank and a frame, and the method further includes: The minimum transmission angle of the crank-rocker mechanism is determined based on the positional relationship between the crank and the frame in the crank-rocker mechanism. Obtain the preset configuration safety factor of the crank-rocker mechanism, and determine the comprehensive dimensional result of the crank-rocker mechanism based on the preset configuration safety factor and the minimum transmission angle of the crank-rocker mechanism.

4. The method as described in claim 3, characterized in that, Determining the minimum transmission angle of the crank-rocker mechanism based on the positional relationship between the crank and the frame in the crank-rocker mechanism includes: A first relationship is established based on the motion parameters corresponding to when the crank and the frame are collinear; A second relationship is established based on the motion parameters corresponding to the overlap between the crank and the frame; The minimum transmission angle of the crank-rocker mechanism is determined based on the first and second relationships.

5. The method as described in claim 4, characterized in that, The rocker-slider mechanism includes a slider and a rocker arm, and the method further includes: The return limit position transmission angle of the rocker-slider mechanism is determined based on the geometric relationship between the slider and the rocker. The return limit position transmission angle is taken as the minimum transmission angle corresponding to the rocker slider mechanism; Obtain the preset structural safety factor of the rocker-slider mechanism, and determine the comprehensive dimensional result of the rocker-slider mechanism based on the preset structural safety factor and the minimum transmission angle.

6. The method as described in claim 1, characterized in that, The determination of the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the motion equation of the adjustable transmission mechanism includes: The real-time position information of the piston of the variable compression ratio engine at the current moment is obtained. The piston is set in the fixed transmission mechanism and is connected to the adjustable transmission mechanism. Based on the real-time position information and the motion equation of the adjustable transmission mechanism, the functional relationship between the piston position information ratio and the position of the adjustable transmission mechanism is determined, and the piston position information is used to determine the compression ratio of the variable compression ratio engine.

7. A device for determining the compression ratio of an engine, characterized in that, The device includes: The first acquisition module is used to acquire the structure of a variable compression ratio engine, the structure including an adjustable transmission mechanism and a fixed transmission mechanism; the adjustable transmission mechanism includes a crank-rocker mechanism and a rocker-slider mechanism; The second acquisition module is used to acquire the geometric features and transmission parameters of the adjustable transmission mechanism; The dimensional synthesis module is used to perform dimensional synthesis on the adjustable transmission mechanism based on the geometric features and the transmission parameters to obtain the dimensional synthesis result; the dimensional synthesis result includes the dimensional synthesis result of the crank-rocker mechanism and the dimensional synthesis result of the rocker-slider mechanism; The determination module is used to determine the motion equation of the adjustable transmission mechanism based on the scale synthesis result, and to determine the functional relationship between the positions of the fixed transmission mechanism and the adjustable transmission mechanism based on the motion equation of the adjustable transmission mechanism. The functional relationship is used to determine the compression ratio of the variable compression ratio engine. A construction module is used to determine the transmission relationship based on the rocker angle of the rocker-slider mechanism and the crank angle of the crank-rocker mechanism; based on the dimensional synthesis results of the crank-rocker mechanism and the rocker-slider mechanism, expressions for the position, velocity, or acceleration of each component in the rocker-slider mechanism and the crank-rocker mechanism are obtained, and these expressions are used as inputs to the motion equations; the transmission relationship, the dimensional synthesis results of the crank-rocker mechanism, and the rocker-slider mechanism are substituted into the motion equations to obtain the complete motion equations of the adjustable transmission mechanism.

8. An electronic device, characterized in that, include: One or more processors; A storage device for storing one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the method for determining the compression ratio of an engine as claimed in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that, when executed by a computer's processor, cause the computer to perform the compression ratio determination method for the engine as described in any one of claims 1 to 6.

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