A method for adjusting performance of a gasoline engine core box air passage

Abstract

The application discloses a gasoline engine core box air channel performance adjusting method, and relates to the field of gasoline engine manufacturing and testing.The method comprises the following steps: performing a tumble ratio test on an air inlet channel of a blowing core box body to obtain test values; when the test values do not meet development targets, confirming an adjusting amount, disassembling an air inlet valve, and determining a sensitive position in the channel for adjusting the tumble ratio as a trimming target position; performing a ladder type material cutting or adding operation on the trimming target position based on the adjusting amount; after completing a single trimming, cleaning the channel and reassembling the air valve, and performing test detection again to obtain retest results; if the retest results do not meet the standards, re-determining a subsequent trimming position and a continuous adjusting amount according to a difference value, and performing ladder type trimming in a loop.The closed-loop trimming through in-situ iterative retesting avoids repeated mold trial production, reduces development costs and shortens the development cycle.

Description

Technical Field

[0001] This application relates to the field of gasoline engine manufacturing and testing, and in particular to a method for adjusting the performance of a gasoline engine core box air passage. Background Technology

[0002] Currently, the flow performance of the intake manifold in gasoline engines has a significant impact on the combustion speed within the cylinder, directly determining the engine's power, fuel economy, and emissions. Ensuring sufficient tumble intensity and uniformity of the airflow is the core objective of the entire intake manifold performance development process.

[0003] Regarding the above-mentioned issues, conventional gasoline engine intake duct development typically employs a multi-stage, alternating verification approach. Developers fabricate a blower core box for testing based on the 3D design scheme. After assembling the blower core box with the intake valves, a tumble ratio test is conducted. The initial test data is used to evaluate whether the current intake duct flow path meets the development goals.

[0004] However, conventional development processes typically require redesigning the entire blower core box and re-molding it when the tumble ratio fails to meet specifications. This leads to development cycle stagnation and repeated R&D cost losses. Furthermore, existing modification attempts lack a clear definition of sensitive areas within the flow channel, resulting in a lack of basis for machining depth and potential interference with the dimensions of sealing structures such as valve seats during operation. Additionally, the lack of a two-way dynamic fine-tuning logic combining material removal and addition makes it difficult to achieve quantitative and efficient precision approximation based on the deviation of test values.

[0005] Therefore, the present invention provides a method for adjusting the performance of the gasoline engine core box air passage to overcome the shortcomings of the prior art. Summary of the Invention

[0006] The purpose of this invention is to provide a method for adjusting the performance of a gasoline engine core box air passage, which aims to solve the problems of long development cycles, high costs, and lack of precise quantitative guidance for air passage structure modification caused by repeated mold-making and trial production of blown core boxes in the existing gasoline engine air passage performance development.

[0007] This invention provides the following solution:

[0008] A method for adjusting the performance of a gasoline engine core housing intake port includes:

[0009] A tumble ratio test was conducted on the air inlet channel of the blower core box body to obtain the tumble ratio test value of the air inlet channel.

[0010] When the tumble ratio test value does not meet the preset air intake development target requirements, confirm the air intake adjustment amount, disassemble the air intake valve on the blower core box body, and determine the sensitive position for adjusting the tumble ratio as the adjustment target position.

[0011] A stepped trimming operation is performed on the determined trimming target position. The stepped trimming operation is based on the amount of airway adjustment to cut or add material to the air intake flow channel.

[0012] After completing the single repair operation, clean the intake manifold and reinstall the intake valve, and perform the tumble ratio test again to obtain the retest test results.

[0013] If the retest results do not meet the preset intake development target requirements, the subsequent adjustment target position and adjustment amount are redefined, and the step-by-step adjustment operation is executed cyclically.

[0014] By adopting the above technical solution, and by using in-situ performance testing guidance and implementing step-by-step trimming operations at sensitive locations, a closed-loop process of alternating retesting and iteration is constructed. Therefore, the efficiency of flow channel debugging is improved and the cost of repeated mold opening and trial production is avoided.

[0015] Preferably, the specific details of determining the sensitive position for adjusting the tumble ratio as the target position for trimming include:

[0016] The air inlet channel of the blower core box body contains multiple regions that directly affect the gas flow performance. These regions that directly affect the gas flow performance are defined as the trimming target positions where the cutting adjustment or material addition operation is performed.

[0017] The target adjustment location specifically includes a first adjustment area, a second adjustment area, and a third adjustment area. The first adjustment area, the second adjustment area, and the third adjustment area together constitute a sensitive location for changing the tumble ratio and flow coefficient of the intake duct.

[0018] Preferably, the specific spatial distribution structure of the adjustment target location, comprising the first adjustment area, the second adjustment area, and the third adjustment area, is as follows:

[0019] The first adjustment area is located inside the throat of the intake manifold, and the first adjustment area is set close to the edge of the throat of the intake manifold. The first adjustment area is distributed near the inner edge of the valve seat positioning part.

[0020] The second adjustment area is located on the left and right walls inside the air intake channel. The second adjustment area is distributed on the left and right sides of the main channel along the gas flow direction of the air intake channel.

[0021] The third adjustment area is located on the upper wall of the intake duct, and the third adjustment area is on the same side as the valve guide. The third adjustment area is distributed in the curved area above the intake duct.

[0022] By adopting the above technical solutions, the physical zones that alter airflow characteristics are clearly defined, thereby improving the targeting and precision of structural modifications.

[0023] Preferably, the specific strategy steps for performing the cutting adjustment at the target position to improve the tumble ratio of the intake duct flow channel are as follows:

[0024] The first adjustment area is selected as the initial trimming target position, and a downward cutting material removal operation is performed on the first adjustment area;

[0025] After cutting the first adjustment area, if the tumble ratio test value of the intake duct flow channel still does not meet the preset intake duct development target requirements, the adjustment target position is transferred from the first adjustment area to the third adjustment area, and the material removal operation is performed on the third adjustment area.

[0026] After performing a material removal operation on the third adjustment zone, if the tumble ratio test value of the intake duct still does not meet the preset intake duct development target requirements, the adjustment target position is transferred to the second adjustment zone to perform a material removal operation.

[0027] Preferably, the specific transfer determination condition for transferring the target position from the first adjustment area to the third adjustment area is:

[0028] When the cutting depth of the first adjustment zone reaches 3mm and the tumble ratio test value still does not meet the preset intake development target requirements, the adjustment target position is transferred from the first adjustment zone to the third adjustment zone.

[0029] By adopting the above technical solution, the cutting sequence and depth are guided by the regional linkage change mechanism, thus preventing damage to the basic structure of the flow channel caused by blind processing.

[0030] Preferably, the specific steps for performing the material addition operation at the determined trimming target location to reduce the tumble ratio of the intake duct flow channel are as follows:

[0031] The material addition process uses an industrial repair agent as a filling medium;

[0032] The industrial repair agent is applied to and cured on the surface of the determined repair target location. By increasing the local structural thickness, the wall position of the corresponding area is raised, thereby reducing the tumble ratio of the air intake channel.

[0033] By adopting the above technical solution, the local wall thickness is changed by filling with the medium, thereby achieving reverse fine-tuning control to reduce the tumble ratio.

[0034] Preferably, the prerequisite for performing the stepped trimming operation on the determined trimming target position is:

[0035] A valve seat positioning part is provided at the end of the air outlet of the intake channel. The structure of the valve seat positioning part is used to install and fix the intake valve.

[0036] During the cutting adjustment or material addition operation, it is strictly forbidden to remove any material or change the shape of the valve seat positioning part and the valve seat installed on the valve seat positioning part, so as to ensure that the sealing structure dimensions of the valve seat positioning part are not affected by the internal material trimming operation.

[0037] By adopting the above technical solution, the dimensions of the critical sealing structure are protected from processing interference, and the testing accuracy in the assembled state is maintained.

[0038] Preferably, the specific operational steps for cutting and adjusting the intake duct flow channel based on the magnitude of the air duct adjustment, including the roughing stage, are as follows:

[0039] If the tumble ratio test value differs significantly from the preset intake duct development target value, a larger adjustment operation is performed in the roughing stage.

[0040] The roughing stage uses a standard pneumatic tool as the cutting device, specifically a pneumatic end mill.

[0041] The standard pneumatic tool is used to perform a downward cutting operation on the surface of the determined trimming target position. During the single cutting operation in the rough trimming stage, the single cutting allowance parameter is strictly controlled within the range of 0.5mm to 1.0mm.

[0042] Preferably, the cutting adjustment, after the roughing stage, also includes a finishing stage, with the following specific steps:

[0043] After the roughing stage, the current tumble ratio test value of the intake duct is close to the preset intake duct development target value, and the trimming operation is switched to the fine trimming stage.

[0044] The finishing stage involves using power tools or homemade cutting tools to refine the local surface of the determined finishing target location through cutting or manual scraping.

[0045] During the single-pass fine-cutting process of the power tool, or when manually scraping with the self-made tool, the cutting allowance parameter is strictly controlled within the range of 0.1mm to 0.3mm.

[0046] By adopting the above technical solution, and utilizing a combination of multi-stage cutting tools and differentiated allowance control, the requirements of rapid macroscopic removal and microscopic fine smoothing are both met.

[0047] Preferably, the specific execution logic for redetermining the subsequent target position and adjustment amount, and cyclically executing the step-by-step adjustment operation is as follows:

[0048] If the results of the retest, i.e. the secondary tumble ratio test value, still do not meet the preset intake duct development target requirements, the target position that needs to be adjusted is re-determined based on the difference between the secondary tumble ratio test value and the preset intake duct development target requirement value, as well as the corresponding adjustment amount value.

[0049] After determining the new trimming strategy, the air intake valve on the blower core box body is disassembled again, and a smaller adjustment is performed on the newly selected trimming target position according to the determined adjustment amount value.

[0050] By adopting the above technical solution, high-precision closed-loop in-situ evolution correction is achieved by dynamically approximating the target based on the remeasured residuals.

[0051] The above solution achieves the following beneficial technical effects:

[0052] This invention establishes a data-driven closed-loop trimming process by directly performing performance testing, in-situ trimming, and iterative retesting on the intake manifold itself. This method replaces the traditional process of reprocessing the air blower core, mold development, and cylinder head casting verification, eliminating the process of repeated trial production, reducing experimental resource consumption, and shortening the development cycle of gasoline engine intake manifolds.

[0053] This invention clearly defines the first, second, and third adjustment zones within the flow channel and defines a stepped dressing strategy based on cutting depth and tool type. This spatially partitioned quantitative processing method guides operators to accurately perform material removal or addition, and the processing strictly limits changes to the shape of the valve seat positioning part, avoiding damage to the basic structure of the air passage and critical sealing dimensions caused by blind dressing.

[0054] This invention provides a two-way adjustment method for cutting away material and applying a cured industrial repair agent, and dynamically determines the subsequent adjustment amount based on the difference between the secondary tumble ratio test value and the development target. This method achieves linked fine-tuning of the tumble ratio and flow coefficient, and improves the flexibility of airflow channel performance debugging and the accuracy of achieving the development target by dynamically approximating the target. Attached Figure Description

[0055] Figure 1 This is a flowchart of the gasoline engine core box air passage performance adjustment method of the present invention;

[0056] Figure 2 This is a partial bottom view of the air inlet structure of the blower core box of the present invention;

[0057] Figure 3 This is a side view cross-sectional structural diagram of the air inlet duct of the blower core box of the present invention.

[0058] Among them, 1. the blower core box body; 2. the intake duct flow channel; 3. the valve seat positioning part; 11. the first adjustment area; 12. the second adjustment area; 13. the third adjustment area. Detailed Implementation

[0059] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] See attached document Figure 1 The present invention provides a method for adjusting the performance of a gasoline engine core housing intake passage, which may include:

[0061] Step S100 is executed to perform an initial tumble ratio test on the air intake channel 2 of the existing blower core box body 1, and to obtain the initial tumble ratio test data of the air intake channel 2. Based on the obtained tumble ratio test data, it is determined whether the current tumble ratio value of the air intake channel 2 of the blower core box body 1 meets the preset air intake development target.

[0062] In step S200, if the tumble ratio of the intake duct flow channel 2 does not meet the preset intake duct development target, the tumble ratio test data is compared and analyzed to confirm the corresponding duct adjustment amount. After confirming the duct adjustment amount, the intake valve on the blower core box body 1 is removed, and based on the actual influence parameters of each position inside the intake duct flow channel 2 on the flow performance, the sensitive positions for adjusting the tumble ratio of the intake duct flow channel 2 of the blower core box body 1 are determined as specific adjustment target areas.

[0063] Step S300 involves performing a stepped trimming operation on the identified trimming target area. The stepped trimming operation uses tools with different cutting capabilities based on the confirmed airway adjustment amount. At the stage of larger adjustment, pneumatic tools are used to perform a larger margin of cutting adjustment on the air intake channel 2 of the blower core box body 1. After the tumble ratio gradually approaches the preset air intake development target, power tools are used to perform a smaller margin of cutting adjustment on the air intake channel 2 of the blower core box body 1, or a self-made tool is used to perform a minor manual scraping adjustment on the air intake channel 2 of the blower core box body 1. The trimming operation is performed without damaging the basic structure of the blower core box body 1 or critical components such as the valve seat.

[0064] In step S400, after completing a single trimming operation, the machining residue generated during cutting is cleaned from the inside of the air intake channel 2 of the blower core box body 1, and the air intake valve is reinstalled onto the blower core box body 1 to restore it to a testable assembly state. A tumble ratio test is then performed again on the air intake channel 2 of the assembled blower core box body 1 to obtain the retest results after the single trimming operation.

[0065] Step S500 involves logical analysis based on the retest results to determine whether the current performance of the intake duct flow channel 2 requires continued maintenance. If continued maintenance is deemed necessary, the target area for subsequent repairs and the required secondary adjustment amount are redefined based on the retest results.

[0066] Step S600 is executed to determine whether the retest results meet the preset intake duct development target. If the retest results fully meet the preset intake duct development target, the air duct performance adjustment of the blower core box body 1 is determined to be successful. If the retest results do not meet the preset intake duct development target, based on the redefined trimming target area and the magnitude of the secondary adjustment in the aforementioned steps, the process returns to the step of disassembling the intake valve and performs a new round of trimming and testing operations until the retest results meet the preset intake duct development target, thus forming a complete data-driven closed-loop trimming process.

[0067] See attached document Figure 2 and attached Figure 3 The present invention provides a method for adjusting the performance of a gasoline engine core housing intake passage, the structure of which may include:

[0068] The blower core box body 1 serves as the basic load-bearing structure for inlet duct testing and trimming. An inlet duct flow channel 2 is formed inside the blower core box body 1. A valve seat positioning part 3 is located at the outlet position at the end of the inlet duct flow channel 2. The structure of the valve seat positioning part 3 is used for installing and fixing the inlet valve. The inlet duct flow channel 2 of the blower core box body 1 contains multiple areas that directly affect the gas flow performance; these areas are defined as trimming target locations for performing material cutting or material addition operations.

[0069] The target adjustment location includes a first adjustment area 11. The first adjustment area 11 is located inside the throat of the intake duct 2. The first adjustment area 11 is positioned close to the edge of the throat of the intake duct 2. (See attached diagram.) Figure 2 As shown in the upward view, the first adjustment area 11 is located near the inner edge of the valve seat positioning part 3.

[0070] The target adjustment location includes the second adjustment zone 12. The second adjustment zone 12 is located on the left and right walls inside the intake duct 2. (See attached diagram.) Figure 2 and appendix Figure 3 From the structural perspective shown, the second adjustment zone 12 is distributed on the left and right sides of the main channel along the gas flow direction of the intake channel 2.

[0071] The target adjustment location includes the third adjustment zone 13. The third adjustment zone 13 is located on the upper wall of the intake duct 2. The third adjustment zone 13 is on the same side as the structure containing the valve guide. (See attached diagram.) Figure 3 As shown in the side view, the third adjustment zone 13 is located in the curved area above the intake manifold 2. The aforementioned first adjustment zone 11, second adjustment zone 12, and third adjustment zone 13 together constitute the sensitive operating position for changing the tumble ratio and flow coefficient of the intake manifold 2 in the gasoline engine core box air passage performance adjustment method.

[0072] Step S100 involves performing an initial tumble ratio test on the air intake channel 2 of the blower core box body 1 to obtain the current tumble ratio test value of the air intake channel 2. The tumble ratio test value is then compared with the preset air intake development target requirements to determine whether the current tumble ratio test value of the air intake channel 2 meets the preset air intake development target requirements. If the tumble ratio test value does not meet the preset air intake development target requirements, the air intake valve on the blower core box body 1 is disassembled, and the analysis and repair process of the internal structure of the air intake channel 2 begins.

[0073] Step S200 involves analyzing the linkage adjustment principle of sensitive locations within the intake duct flow channel 2 and formulating corresponding adjustment strategies. The first adjustment zone 11, the second adjustment zone 12, and the third adjustment zone 13 exhibit a linkage change pattern in their effects on the tumble ratio and flow coefficient of the intake duct flow channel 2. Performing a downward cutting operation on the first adjustment zone 11 decreases the tumble ratio of the intake duct flow channel 2 and simultaneously increases its relative flow rate. Performing a lifting and adding operation on the first adjustment zone 11 increases the tumble ratio of the intake duct flow channel 2 and simultaneously decreases its relative flow rate.

[0074] With the goal of the trimming strategy being to increase the tumble ratio of the intake duct 2, a spatial priority level for the trimming operation is set based on the linkage adjustment principle. The first adjustment zone 11 is selected as the initial trimming target, and a downward cutting operation is performed on it. A preset limit cutting allowance threshold of 3mm is set for the first adjustment zone 11. If, after the cutting depth of the first adjustment zone 11 reaches 3mm, the tumble ratio test value of the intake duct 2 still does not meet the preset intake development target requirement, the trimming target is shifted from the first adjustment zone 11 to the third adjustment zone 13.

[0075] After shifting the adjustment target to the third adjustment zone 13, a material removal operation is performed on the third adjustment zone 13 to further improve the tumble ratio of the intake duct flow channel 2 by removing the surface material of the third adjustment zone 13. If the tumble ratio test value of the intake duct flow channel 2 still does not meet the preset intake development target requirements after the material removal operation on the third adjustment zone 13, the adjustment target is further shifted to the second adjustment zone 12. A material removal operation is performed on the second adjustment zone 12 to cumulatively improve the tumble ratio of the intake duct flow channel 2.

[0076] With the goal of the modification strategy being to reduce the tumble ratio of intake duct channel 2, a reverse material addition operation is performed on each of the aforementioned adjustment areas. The reverse material addition operation uses an industrial repair agent as the filling medium. The industrial repair agent is applied to and cured on the surface of the determined modification target location, raising the wall position of the corresponding area by increasing the local structural thickness, thereby reducing the tumble ratio of intake duct channel 2.

[0077] Step S300 involves performing a stepped trimming operation on the identified sensitive adjustment area. During any trimming operation on the blower core box body 1, strict structural protection constraints are set. These constraints require that the structural integrity of the original critical components of the blower core box body 1 be maintained during cutting or adding material. During the operation, any material removal or shape alteration of the valve seat positioning part 3 and the valve seat mounted on it is strictly prohibited, ensuring that the sealing structure dimensions of the valve seat positioning part 3 are not affected by the material trimming operation inside the intake passage 2.

[0078] When the current tumble ratio test value of the intake duct flow channel 2 differs significantly from the preset intake duct development target value, a large adjustment operation is performed during the roughing stage. The roughing stage uses a standard pneumatic tool as the cutting device. Specifically, a pneumatic end mill is selected. The cutting end of the standard pneumatic tool is equipped with a large-size cutter head, the geometry of which is set to cylindrical or elliptical. The standard pneumatic tool is used to perform downward cutting to remove material from the surface of the selected first adjustment area 11, second adjustment area 12, or third adjustment area 13. During a single cut in the roughing stage, the single cutting allowance parameter is strictly controlled within the range of 0.5mm to 1.0mm, thereby achieving rapid and significant adjustment of the internal air passage space shape of the intake duct flow channel 2.

[0079] After the roughing stage, the current tumble ratio test value of the intake duct flow channel 2 is close to the preset intake duct development target value. At this point, the trimming operation is switched to the fine-tuning stage. The fine-tuning stage is used for minor adjustments, using power tools or self-made cutting tools as the execution equipment. The cutting end of the power tool is equipped with a small-sized cutting head, and the geometry of the small-sized cutting head is set to a small-diameter cylindrical or conical shape. The power tool is used to perform fine cutting on the local surface of the first adjustment area 11, the second adjustment area 12, or the third adjustment area 13. During a single fine cutting operation of the power tool, the single cutting allowance parameter is strictly controlled within the value range of 0.1mm to 0.3mm to prevent excessive material removal that would cause the tumble ratio test value to deviate from the development target.

[0080] During the finishing stage, the homemade tool is configured to perform minor manual adjustments. The homemade tool uses a manual scraping method to smooth and remove surface roughness and local microstructures in the trimmed area inside the air intake channel 2. When manually scraping the first adjustment area 11, the second adjustment area 12, or the third adjustment area 13 using the homemade tool, the cutting allowance for each scraping is limited to a range of 0.1mm to 0.3mm. Through a stepped combination of standard pneumatic tools, power tools, and the homemade tool at different cutting allowance standards, the shape of the air intake channel 2 of the blower core box body 1 is precisely trimmed.

[0081] Step S400 involves cleaning the internal space of the air intake channel 2 after a single trimming operation on a specific area inside the blower core box body 1. This removes material debris generated during the trimming process or excess industrial repair agent residue after curing. After cleaning the inside of the air intake channel 2, the previously disassembled air intake valve is reinstalled in its preset assembly position on the blower core box body 1. After the air intake valve is reinstalled, a tumble ratio test is performed again on the air intake channel 2 of the blower core box body 1 using corresponding airway testing equipment. The secondary tumble ratio test value of the trimmed air intake channel 2 is then used as the retest result data.

[0082] Step S500 involves comparing the acquired secondary tumble ratio test value with the preset intake duct development target value. If the secondary tumble ratio test value still does not meet the preset intake duct development target value, it is determined that further maintenance operations are needed inside the intake duct flow channel 2. Based on the difference between the secondary tumble ratio test value and the preset intake duct development target value, and combined with the aforementioned linkage adjustment principle of the first adjustment zone 11, second adjustment zone 12, and third adjustment zone 13 for tumble ratio and relative flow rate, the target position to be adjusted and the corresponding adjustment amount are re-determined. After determining the new adjustment strategy, the intake valve on the blower core box body 1 is disassembled again, and the smaller adjustment amount adjustment operation of the fine-tuning stage is performed on the newly selected adjustment zone according to the determined adjustment amount.

[0083] Step S600 is executed to determine the final target achievement based on the test results obtained after further adjustments, cleaning, reassembly, and retesting. If the currently measured tumble ratio test value meets the preset intake duct development target value, the performance adjustment operation of the intake duct flow channel 2 of the blower core box body 1 is deemed successful, and the entire performance adjustment process ends. If the currently measured tumble ratio test value still does not meet the preset intake duct development target value, the process returns to the step of obtaining the difference analysis again, and the closed-loop adjustment process of test data analysis, disassembling the intake valve, locating sensitive adjustment positions, and local cutting detection is re-executed until the final output tumble ratio test result fully meets the preset intake duct development target value. By directly performing the above-mentioned in-situ closed-loop iterative adjustment operation on the existing blower core box body 1, the time cycle for a single intake duct flow channel 2 performance development test is shortened to 10 days, while eliminating the process of re-molding and casting, and avoiding a re-trial cost of 3500 yuan per piece.

[0084] The present invention provides a method for adjusting the performance of a gasoline engine core housing intake passage, which may further include the following data verification based on three-dimensional calculations and test results from embodiments:

[0085] In the specific implementation of this method, the public test premise is set as a single adjustment operation inside the blower core box body 1. All operations are performed by using a linkage adjustment method to simultaneously adjust two or three areas of the first adjustment area 11, the second adjustment area 12, and the third adjustment area 13. There is no setting for adjusting the above single adjustment area separately and obtaining isolated single-position test data results.

[0086] Initial baseline data is obtained, and the air inlet channel 2 of the blower core box body 1 that has not undergone the repair operation is tested using air inlet test equipment. The initial tumble ratio and initial flow coefficient of the air inlet channel 2 are obtained and recorded.

[0087] Set up a linkage trimming test group and perform trimming operations. For the blower core box body 1 in the test state, use the linkage trimming method to perform downward cutting operations on the first adjustment area 11, the second adjustment area 12 and the third adjustment area 13 in combination with the cutting allowance values ​​defined in the table below.

[0088] After completing the cutting, internal cleaning, and intake valve reinstallation operations of the test group, the air passage test equipment is used to conduct a secondary test on the repaired intake passage 2 to obtain the corresponding secondary tumble ratio and secondary flow coefficient values, and to calculate the change ratio of the secondary test values ​​relative to the initial reference data.

[0089] Table 1 below shows the test data on the impact of specific adjustment positions on various parameters under a given adjustment margin, obtained through three-dimensional calculations:

[0090] Table 1. Experimental data on the influence of airway performance adjustment parameters.

[0091] Adjust position Adjustment allowance (mm) Influencing parameter: tumble ratio Influencing parameter flow coefficient Second Adjustment Zone 12 1.0 4.0% 1.5% First Adjustment Zone 11 0.2 3.0% 2.5% Third Adjustment Zone 13 1.0 7.0% 5.0%

[0092] The data in Table 1 above are the basic influence ratio data obtained through three-dimensional calculation. When performing the trimming operation on the first adjustment zone 11, the verification data obtained based on three-dimensional calculation shows that, under the condition that the single adjustment margin value set for the first adjustment zone 11 is 0.2mm, the influence ratio of this trimming operation on the overall tumble ratio parameter of the intake duct 2 is 3.0%, and the influence ratio on the overall flow coefficient parameter of the intake duct 2 is 2.5%.

[0093] When performing a trimming operation on the second adjustment zone 12, the verification data obtained based on three-dimensional calculations show that, under the condition that the single adjustment margin value set for the second adjustment zone 12 is 1.0 mm, the trimming operation has an impact ratio of 4.0% on the overall tumble ratio parameter of the intake channel 2, and an impact ratio of 1.5% on the overall flow coefficient parameter of the intake channel 2.

[0094] When performing a trimming operation on the third adjustment zone 13, the verification data obtained based on three-dimensional calculations show that, under the condition that the single adjustment margin value set for the third adjustment zone 13 is 1.0 mm, the trimming operation has an impact ratio of 7.0% on the overall tumble ratio parameter of the intake duct 2, and an impact ratio of 5.0% on the overall flow coefficient parameter of the intake duct 2.

[0095] Based on the above test data, the following technical facts are derived: After performing the test adjustment operation, a coordinated adjustment operation with specific cutting allowance values ​​is performed on the first adjustment zone 11, the second adjustment zone 12, and the third adjustment zone 13 inside the blower core box body 1. This can quantitatively change the tumble ratio and flow coefficient parameters of the intake duct flow channel 2 according to a preset adjustment influence ratio. The clearly defined influence ratio data of the first adjustment zone 11, the second adjustment zone 12, and the third adjustment zone 13 on the tumble ratio and flow coefficient under specific adjustment allowance parameters objectively proves that the technical solution of the air duct performance coordinated adjustment method and adjustment logic in this embodiment of the invention is real and effective.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adjusting the performance of a gasoline engine core housing intake passage, characterized in that, include: A tumble ratio test was conducted on the air inlet channel (2) of the blower core box body (1) to obtain the tumble ratio test value of the air inlet channel (2); When the tumble ratio test value does not meet the preset air intake development target requirements, confirm the air intake adjustment amount, disassemble the air intake valve on the blower core box body (1), and determine the sensitive position for adjusting the tumble ratio as the adjustment target position. A stepped trimming operation is performed on the determined trimming target position. The stepped trimming operation is based on the size of the airway adjustment to cut or add material to the air inlet channel (2). After completing the single repair operation, clean the intake duct flow channel (2) and reinstall the intake valve, and perform the tumble ratio test again to obtain the retest test results; If the retest results do not meet the preset intake development target requirements, the subsequent adjustment target position and adjustment amount are redefined, and the step-by-step adjustment operation is executed cyclically.

2. The method for adjusting the performance of a gasoline engine core housing and intake passage according to claim 1, characterized in that, The specific details of determining the sensitive location for adjusting the tumble ratio as the target location for trimming include: The air inlet channel (2) of the blower core box body (1) contains multiple regions that directly affect the gas flow performance. The regions that directly affect the gas flow performance are defined as the trimming target positions for performing the cutting adjustment or material addition operations. The target adjustment location specifically includes a first adjustment area (11), a second adjustment area (12), and a third adjustment area (13). The first adjustment area (11), the second adjustment area (12), and the third adjustment area (13) together constitute a sensitive location for changing the tumble ratio and flow coefficient of the intake channel (2).

3. The method for adjusting the performance of a gasoline engine core housing and intake passage according to claim 2, characterized in that, The specific spatial distribution structure of the target adjustment location, including the first adjustment area (11), the second adjustment area (12), and the third adjustment area (13), is as follows: The first adjustment area (11) is located inside the throat of the intake channel (2). The first adjustment area (11) is set close to the edge of the throat of the intake channel (2). The first adjustment area (11) is distributed near the inner edge of the valve seat positioning part (3). The second adjustment area (12) is located on the left and right walls inside the air intake channel (2). The second adjustment area (12) is distributed on the left and right sides of the main channel along the gas flow direction of the air intake channel (2). The third adjustment area (13) is located on the upper wall of the intake channel (2). The third adjustment area (13) is on the same side as the valve guide. The third adjustment area (13) is distributed in the curved area above the intake channel (2).

4. The method for adjusting the performance of a gasoline engine core housing and intake passage according to claim 2, characterized in that, The specific strategy steps for performing the cutting adjustment at the target position to improve the tumble ratio of the intake flow channel (2) are as follows: The first adjustment area (11) is selected as the initial trimming target position, and a downward cutting material removal operation is performed on the first adjustment area (11); After cutting the first adjustment area (11), if the tumble ratio test value of the intake channel (2) still does not meet the preset intake development target requirements, the adjustment target position is transferred from the first adjustment area (11) to the third adjustment area (13), and the material removal operation is performed on the third adjustment area (13). After the material removal operation is performed on the third adjustment zone (13), if the tumble ratio test value of the air intake channel (2) still does not meet the preset air intake development target requirements, the adjustment target position is transferred to the second adjustment zone (12) to perform the material removal operation.

5. A method for adjusting the performance of a gasoline engine core housing and intake passage according to claim 4, characterized in that, The specific conditions for transferring the target position from the first adjustment area (11) to the third adjustment area (13) are as follows: When the cutting depth of the first adjustment area (11) reaches 3 mm and the tumble ratio test value still does not meet the preset air intake development target requirements, the adjustment target position is transferred from the first adjustment area (11) to the third adjustment area (13).

6. The method for adjusting the performance of a gasoline engine core housing and intake passage according to claim 2, characterized in that, The specific steps for performing the material addition operation at the determined trimming target location to reduce the tumble ratio of the intake duct (2) are as follows: The material addition process uses an industrial repair agent as a filling medium; The industrial repair agent is applied and cured on the surface of the determined repair target position. The wall position of the corresponding area is raised by increasing the local structural thickness, thereby reducing the tumble ratio value of the air intake channel (2).

7. The method for adjusting the performance of a gasoline engine core housing and intake passage according to claim 1, characterized in that, The prerequisite for performing a stepped trimming operation on the determined trimming target location is as follows: The valve seat positioning part (3) is provided at the end of the air outlet of the intake channel (2). The structure of the valve seat positioning part (3) is used to install and fix the intake valve. During the cutting adjustment or material addition operation, it is strictly forbidden to remove any material or change the shape of the valve seat positioning part (3) and the valve seat installed on the valve seat positioning part (3), so as to ensure that the sealing structure dimensions of the valve seat positioning part (3) are not affected by the internal material trimming operation.

8. The method for adjusting the performance of a gasoline engine core housing air passage according to claim 1, characterized in that, The specific steps for cutting and adjusting the intake channel (2) based on the amount of airway adjustment, including the roughing stage, are as follows: If the tumble ratio test value differs significantly from the preset intake duct development target value, a larger adjustment operation is performed in the roughing stage. The roughing stage uses a standard pneumatic tool as the cutting device, specifically a pneumatic end mill. The standard pneumatic tool is used to perform a downward cutting operation on the surface of the determined trimming target position. During the single cutting operation in the rough trimming stage, the single cutting allowance parameter is strictly controlled within the range of 0.5mm to 1.0mm.

9. A method for adjusting the performance of a gasoline engine core housing air passage according to claim 8, characterized in that, The cutting adjustment, following the roughing stage, also includes a fine-tuning stage. The specific steps are as follows: After the roughing stage, the current tumble ratio test value of the intake duct flow channel (2) is close to the preset intake duct development target value, and the trimming operation is switched to the fine trimming stage. The finishing stage involves using power tools or homemade cutting tools to refine the local surface of the determined finishing target location through cutting or manual scraping. During the single-pass fine-cutting process of the power tool, or when manually scraping with the self-made tool, the cutting allowance parameter is strictly controlled within the range of 0.1mm to 0.3mm.

10. A method for adjusting the performance of a gasoline engine core housing air passage according to claim 1, characterized in that, The specific execution logic for redefining the subsequent target position and adjustment amount, and cyclically executing the step-by-step adjustment operation is as follows: If the results of the retest, i.e. the secondary tumble ratio test value, still do not meet the preset intake duct development target requirements, the target position that needs to be adjusted is re-determined based on the difference between the secondary tumble ratio test value and the preset intake duct development target requirement value, as well as the corresponding adjustment amount value. After determining the new trimming strategy, the air intake valve on the blower core box body (1) is disassembled again, and a smaller adjustment amount trimming operation is performed on the newly selected trimming target position according to the determined adjustment amount value.

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