Auxiliary platform for building rack of automobile air conditioning system and rack reduction degree evaluation method

Abstract

The invention provides an auxiliary platform for building an automobile air-conditioning system rack and a rack restoration degree evaluation method, and relates to the technical field of automobile air-conditioning system racks, the platform comprises a coordinate display panel, a projection lamp, a boundary simulation calculator and a movable plugging support; the number of the coordinate display panels is three, every two coordinate display panels are perpendicular to each other, and through hole slots are formed in the coordinate display panels at fixed intervals. The projection lamp is placed at a position perpendicular to the coordinate display panel and is used for projecting connecting pipelines among the components; the mobile plugging support is installed in the through hole slot of the coordinate display panel and is used for bearing components. The boundary simulation calculator is connected with the coordinate display panel through a data line and used for calculating port position coordinates, curvature and pressure drop of the pipeline between the components. The method can effectively simulate the arrangement of the air conditioning system of the whole vehicle, calculates the track and curvature of the air conditioning pipeline, and judges the reasonability of the built rack through the pressure drop of the system.

Description

Technical Field

[0001] This invention relates to the field of automotive air conditioning system test bench technology, and particularly to an auxiliary platform for building automotive air conditioning system test benches and a method for evaluating the replicability of test benches. Background Technology

[0002] The traditional process for building an air conditioning system test bench involves roughly placing a vehicle model and then selecting the appropriate component placement positions on a metal frame based on experience. Because the test bench's working area is small, system components are often placed first, followed by piping connections. This frequently results in severe piping deformation, necessitating component disassembly and rearrangement. This process is cumbersome, consumes a significant amount of unproductive manpower and time, and the test bench layout is poorly replicated from the actual vehicle layout, affecting the accuracy of the test bench. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. The present invention provides an auxiliary platform for building an automotive air conditioning system test bench and a method for evaluating the test bench's fidelity, so as to improve the efficiency of air conditioning system test bench construction and the fidelity of the test bench, and improve the accuracy of air conditioning system test bench testing.

[0004] In a first aspect, embodiments of the present invention provide an auxiliary platform for building an automotive air conditioning system bench, including: a coordinate display panel, a projection lamp, a boundary simulation calculator, and a movable pluggable bracket;

[0005] The coordinate display panel includes three panels, which are perpendicular to each other in pairs, and each panel has through holes or slots at fixed intervals.

[0006] The projection lamp is placed perpendicular to the coordinate display panel and is used to project the connecting pipes between components.

[0007] The movable plug-in bracket is installed in the through-hole slot of the coordinate display panel to support components;

[0008] The boundary simulation calculator is connected to the coordinate display panel via a data cable and is used to calculate the port position coordinates, curvature, and pressure drop of the pipeline between components.

[0009] In some embodiments, it further includes: a base;

[0010] The coordinate display panel is mounted on the base;

[0011] The boundary simulation calculator has a calculator interface that displays the position coordinates, curvature, and pressure drop of the ports of the pipelines between components.

[0012] In some embodiments, the coordinate display panel is divided into coordinate system planes with a preset length as the smallest unit, so that the coordinate display panel is divided into several small squares, each small square is equipped with an indicator light, and through-hole slots with fixed intervals are opened between each row of squares on the panel.

[0013] In some embodiments, the preset length is two centimeters.

[0014] In some embodiments, it further includes: a movable pipe support; the movable pipe support is installed in the through-hole slot of the coordinate display panel for supporting the pipe.

[0015] In a second aspect, embodiments of the present invention provide a method for evaluating the replicability of an automotive air conditioning system bench, which builds an auxiliary platform based on the automotive air conditioning system bench provided in the first aspect, the method comprising:

[0016] The projection lamp projects the pipeline trajectory between the connecting components onto three coordinate display panels in the x, y, and z directions;

[0017] The boundary simulation calculator calculates the port coordinates, curvature, and pressure drop of the pipelines between components;

[0018] The pipeline fidelity is obtained by comparing the calculated pressure drop with the corresponding simulated pipeline pressure drop.

[0019] In some embodiments, it also includes:

[0020] The boundary simulation calculator calculates the system pressure drop of the air conditioning rack piping by cumulatively calculating the relationship between the curvature and pressure drop of each pipe.

[0021] The bench fidelity is obtained by comparing the calculated system voltage drop with the corresponding simulated system voltage drop value.

[0022] In some embodiments, the step of calculating the port position coordinates of the conduits between components includes:

[0023] Based on the information projected onto the three coordinate display panels, the starting coordinate point information of the pipeline is obtained;

[0024] Obtain the pipeline length, maximum allowable curvature, and maximum number of bends, and calculate the coordinates of the pipeline's endpoint.

[0025] In some embodiments, the curvature of the calculated pipeline adopts a spatial bend curvature calculation model, which includes: curvature κ.

[0026] The curvature κ is obtained using differential geometry formulas: = ,

[0027] Among them, the centerline of the bend is represented by a mathematical parametric equation. express.

[0028] In some embodiments, the pressure drop calculation for the pipeline between components is based on the curvature data at the pipeline bends, generating the pressure drop caused by the bends. The bend pressure drop calculation model includes:

[0029] Pi=ζ(ρ / 2) ω² (L*K / 90°),

[0030] Where P1 is the pressure loss of the bend, ζ is the drag coefficient, ρ is the density of the fluid, ω is the average velocity of the fluid in the pipe before the bend, L is the length of the bend, and K is the curvature of the bend.

[0031] This invention provides an auxiliary platform for building an automotive air conditioning system test bench and a method for evaluating the bench's fidelity. It effectively simulates the layout of the entire vehicle's air conditioning system, calculates the trajectory and curvature of the air conditioning pipes, and determines the rationality of the constructed test bench based on system pressure drop. During the construction of the air conditioning system test bench, the positions of components and the routing of pipes are fine-tuned using a pluggable movable bracket based on the magnitude of the system pressure drop error. This reduces the impact of air conditioning pipe errors on the test bench's performance accuracy, resulting in a highly accurate simulation of the entire vehicle's air conditioning piping system. Attached Figure Description

[0032] Figure 1 This is one of the schematic diagrams of an auxiliary platform structure for building an automotive air conditioning system bench, as provided in an embodiment of the present invention.

[0033] Figure 2 This is the second schematic diagram of an auxiliary platform structure for building an automotive air conditioning system bench, as provided in an embodiment of the present invention.

[0034] Figure 3 This is one of the flowcharts for a bench fidelity evaluation method for an automotive air conditioning system provided in an embodiment of the present invention.

[0035] Figure 4 This is the second flowchart of a method for evaluating the replicability of an automotive air conditioning system bench, provided as an embodiment of the present invention.

[0036] Figure 5 This is a flowchart illustrating one possible implementation of the steps for calculating the port position coordinates of pipelines between components, as provided in an embodiment of the present invention. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of the present invention, exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0038] Where there is no conflict, the various embodiments of the present invention and the features thereof may be combined with each other.

[0039] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0040] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Terms such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0041] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein.

[0042] One related technology, patent document CN208061473U, discloses a new energy vehicle air conditioning training platform. This platform integrates the vehicle's internal air conditioning system, along with a control computer and control panel for operating the system, onto a single experimental frame. Users can operate the vehicle's air conditioning system in real-time via this platform, enabling training in air conditioning system maintenance skills and achieving a realistic teaching effect, thus enhancing the intuitiveness of the teaching. While this solution effectively provides a comfortable riding environment and improves driving safety, its complex structure and circuitry necessitate improvements to existing teaching experimental platforms that cannot directly display teaching content and suffer from poor teacher-student interaction, thereby enhancing teaching effectiveness. However, this solution does not provide auxiliary methods for constructing the air conditioning platform or methods for evaluation.

[0043] The second related technology, patent document CN216692747U, discloses a multi-functional adjustable test bench for positioning and supporting automotive air conditioning units. It includes a base, height adjustment components, and a bracket. The bracket is used to erect and install the air conditioning unit, and the height adjustment components allow for overall height adjustment of the bracket and the air conditioning unit. This solution aims to address the inconvenience of positioning and supporting air conditioning units of different sizes during the construction of existing air conditioning cooling system test benches. However, this multi-functional adjustable test bench is only used for positioning and supporting automotive air conditioning units. This solution does not detail the arrangement and positioning of various components of the air conditioning system and does not address the rational distribution and evaluation of components on the air conditioning system test bench.

[0044] In summary, existing air conditioning systems are geographically dispersed and occupy a large amount of space within the vehicle. However, in air conditioning bench testing, due to limitations in testing equipment and space, the components and piping of the air conditioning system need to be arranged very compactly. Traditional air conditioning bench construction relies on individual experience to arrange components and connect corresponding pipes one by one. Often, an improper placement of a component necessitates disassembly and reassembly, significantly reducing work efficiency. Furthermore, improper component placement can cause substantial pressure drops in the air conditioning piping, thus affecting the accuracy of the air conditioning bench test.

[0045] Figure 1 This invention provides one of the schematic diagrams of an auxiliary platform structure for building an automotive air conditioning system bench; as shown in the following example. Figure 1 As shown, an embodiment of the present invention provides an auxiliary platform for building an automotive air conditioning system bench, including: a coordinate display panel, a projection lamp, a boundary simulation calculator, and a movable pluggable bracket.

[0046] The coordinate display panel includes three panels, which are perpendicular to each other in pairs, and each panel has through-hole slots with a fixed interval.

[0047] The projection lamp is placed perpendicular to the coordinate display panel and is used to project the connecting pipes between components.

[0048] The movable plug-in bracket is installed in the through-hole slot of the coordinate display panel to support components.

[0049] The boundary simulation calculator is connected to the coordinate display panel via a data cable and is used to calculate the port position coordinates, curvature, and pressure drop of the pipeline between components.

[0050] In some embodiments, such as Figure 2As shown, it also includes: a base; the coordinate display panel is mounted on the base; the boundary simulation calculator has a calculator panel, on which the position coordinates, curvature and pressure drop of the ports of the pipelines between components are displayed.

[0051] In some embodiments, the coordinate display panel is divided into coordinate system planes with a preset length as the smallest unit, so that the coordinate display panel is divided into several small squares, each small square is equipped with an indicator light, and through-hole slots with fixed intervals are opened between each row of squares on the panel.

[0052] In some embodiments, the preset length is two centimeters.

[0053] In some embodiments, it further includes: a movable pipe support; the movable pipe support is installed in the through-hole slot of the coordinate display panel for supporting the pipe.

[0054] In some embodiments, an auxiliary platform for building an automotive air conditioning system bench is provided, including: a base 1, a coordinate display panel 2, a coordinate display panel 3, a coordinate display panel 4, a boundary simulation calculator 5, a projection lamp 6, movable pluggable brackets 7 and 11, a movable pipe bracket 8, a full-way solenoid valve 9, a water condenser 10, and pipes 12.

[0055] The full-pass solenoid valve 9 is mounted on the movable pluggable bracket 7, and the movable pluggable bracket 7 is mounted on the coordinate display panel 2;

[0056] Projector 6 projects the spatial coordinates of the outlet of the full-pass solenoid valve 9 onto three coordinate display panels 2, 3, and 4 in the x, y, and z directions to obtain the starting coordinate point information of the pipeline.

[0057] The water condenser 10 is mounted on a movable pluggable bracket 11, which is mounted on the coordinate display panel 3.

[0058] The boundary simulation calculator 5 calculates the endpoint coordinates of the pipeline based on the input parameters such as the length of the pipeline connecting the full-way solenoid valve 9 and the water condenser 10, the maximum allowable curvature, and the maximum number of bends.

[0059] Based on the calculated set of coordinate regions of the pipeline endpoint, coordinate display panels 2, 3, and 4 illuminate the corresponding region on the coordinate display panel. This illuminated region represents the projected position of the inlet location of the water condenser 10 onto the x, y, and z planes.

[0060] The inlet of pipe 12 is connected to the outlet of the full-way solenoid valve 9, and the outlet of pipe 12 is connected to the inlet of the water condenser 10; pipe 12 is clamped on the movable pipe support 8, and the movable pipe support 8 is installed on the coordinate display panel 3.

[0061] The projection lamp 6 projects the spatial trajectory of the pipeline 12 onto the x, y, z coordinate display panel, and the projection curves L1, L2, and L3 are obtained through image processing technology. Based on this, the curvature at each inflection point of the pipeline 12 is calculated. The spatial elbow curvature calculation model includes: curvature κ,

[0062] The center line of the elbow can be represented by a mathematical parametric equation and the curvature κ can be directly obtained through the differential geometry formula:

[0063] = .

[0064] Based on the curvature data at the inflection points of the pipeline 12, the pressure drop caused by the elbow is generated. The elbow pressure drop calculation model (the pressure loss after the fluid passes through this section of the elbow) includes:

[0065] Pi = ζ(ρ / 2) ω² (L*K / 90°),

[0066] where P1: the pressure loss of the elbow

[0067] ζ: the resistance coefficient

[0068] ρ: the density of the fluid

[0069] ω: the average velocity of the fluid in the pipeline before the elbow

[0070] L: the length of the elbow

[0071] K: the curvature of the elbow.

[0072] Through the above method, the bench of the air conditioning system is built. According to the linear superposition relationship of the pressure drop of the system pipeline, the total pressure drop P of the system pipeline is obtained: P = ∑Pi;

[0073] Understandably, the ratio R of the total pressure drop P of the system pipeline to the simulation value P" of the CAE pipeline pressure drop of the vehicle air conditioning system is compared. By adjusting the positions of the mobile pluggable bracket and the movable pipeline bracket, the value of R is controlled within a reasonable range (for example: 0.9 < R < 1.1). The ratio R can be used to evaluate the bench reduction degree, and the bench reduction degree is the similarity degree between the bench air conditioning pipeline layout and the actual vehicle layout.

[0074] Based on the same inventive concept, the embodiment of the present invention also provides a method for evaluating the bench reduction degree of an automotive air conditioning system. Figure 3 It is one of the flowcharts of a method for evaluating the bench reduction degree of an automotive air conditioning system provided by the embodiment of the present invention. This method for evaluating the bench reduction degree of an automotive air conditioning system is based on the auxiliary platform for building the bench of the automotive air conditioning system provided in the previous embodiment. For the specific description of this auxiliary platform for building the bench of the automotive air conditioning system, reference can be made to the content in the previous embodiment, such as Figure 3As shown, the bench replicateability evaluation method for this automotive air conditioning system includes:

[0075] Step S1: The projection lamp projects the pipeline trajectory between the connecting components onto three coordinate display panels from the x, y, and z directions;

[0076] Step S2: The boundary simulation calculator calculates the port coordinates, curvature, and pressure drop of the pipeline between components (the start and end points of a certain pipeline segment);

[0077] Step S3: Obtain the pipeline restoration degree based on the ratio of the calculated pressure drop to the corresponding simulated pipeline pressure drop value.

[0078] In some embodiments, such as Figure 4 As shown, it also includes:

[0079] Step S4: The boundary simulation calculator calculates the system pressure drop of the air conditioning rack piping by cumulatively calculating the relationship between the curvature and pressure drop of each pipe.

[0080] Step S5: Obtain the bench simulation accuracy based on the ratio of the calculated system voltage drop to the corresponding simulated system voltage drop value.

[0081] Based on the simulated pressure drop results of the vehicle's air conditioning system, the pressure drop error between the control frame and the simulated vehicle is within a reasonable range.

[0082] In some embodiments, such as Figure 5 As shown, the step of calculating the port position coordinates of the pipeline between components includes:

[0083] Step S21: Obtain the starting coordinate point information of the pipeline based on the information projected onto the three coordinate display panels;

[0084] Step S22: Obtain the pipeline length, maximum allowable curvature, and maximum number of bends, and calculate the coordinate information of the pipeline's endpoint.

[0085] In some embodiments, the curvature of the calculated pipeline adopts a spatial bend curvature calculation model, which includes: curvature κ.

[0086] The centerline of a bend can be represented by a mathematical parametric equation. This means that the curvature κ can be directly calculated using differential geometry formulas.

[0087] = .

[0088] In some embodiments, the pressure drop calculation for the pipeline between components is based on the curvature data at the pipeline bends, generating the pressure drop caused by the bends. The bend pressure drop calculation model includes:

[0089] Pi=ζ(ρ / 2) ω² (L*K / 90°),

[0090] Where P1 is the pressure loss of the bend, ζ is the drag coefficient, ρ is the density of the fluid, ω is the average velocity of the fluid in the pipe before the bend, L is the length of the bend, and K is the curvature of the bend.

[0091] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of the invention as set forth in the appended claims.

Claims

1. An auxiliary platform for constructing an automotive air conditioning system chassis, characterized in that, include: Coordinate display panel, projection lamp, boundary simulation calculator, movable pluggable bracket; The coordinate display panel includes three panels, which are perpendicular to each other in pairs, and each panel has through holes or slots at fixed intervals. The projection lamp is placed perpendicular to the coordinate display panel and is used to project the connecting pipes between components. The movable plug-in bracket is installed in the through-hole slot of the coordinate display panel to support components; The boundary simulation calculator is connected to the coordinate display panel via a data cable and is used to calculate the port position coordinates, curvature, and pressure drop of the pipeline between components.

2. The platform according to claim 1, characterized in that, Also includes: Base; The coordinate display panel is mounted on the base; The boundary simulation calculator has a calculator interface that displays the position coordinates, curvature, and pressure drop of the ports of the pipelines between components.

3. The platform according to claim 1 or 2, characterized in that, The coordinate display panel is divided into coordinate planes with a preset length as the smallest unit, so that the coordinate display panel is divided into several small squares. Each small square is equipped with an indicator light, and through-hole slots with fixed intervals are opened between each row of squares on the panel.

4. The platform according to claim 3, characterized in that, The preset length is two centimeters.

5. The platform according to claim 1, characterized in that, Also includes: Movable pipe support; the movable pipe support is installed in the through-hole slot of the coordinate display panel to support the pipe.

6. A method for evaluating the bench fidelity of an automotive air conditioning system, characterized in that, Based on the automotive air conditioning system bench erection auxiliary platform according to any one of claims 1 to 5, the method includes: The projection lamp projects the pipeline trajectory between the connecting components onto three coordinate display panels in the x, y, and z directions; The boundary simulation calculator calculates the port coordinates, curvature, and pressure drop of the pipelines between components; The pipeline fidelity is obtained by comparing the calculated pressure drop with the corresponding simulated pipeline pressure drop.

7. The method according to claim 6, characterized in that, Also includes: The boundary simulation calculator calculates the system pressure drop of the air conditioning rack piping by cumulatively calculating the relationship between the curvature and pressure drop of each pipe. The bench fidelity is obtained by comparing the calculated system voltage drop with the corresponding simulated system voltage drop value.

8. The method according to claim 6 or 7, characterized in that, The steps for calculating the port position coordinates of the pipelines between components include: Based on the information projected onto the three coordinate display panels, the starting coordinate point information of the pipeline is obtained; Obtain the pipeline length, maximum allowable curvature, and maximum number of bends, and calculate the coordinates of the pipeline's endpoint.

9. The method according to claim 8, characterized in that, The curvature of the calculated pipeline adopts a spatial bend curvature calculation model, which includes: curvature κ. The curvature κ is obtained using differential geometry formulas: = , Among them, the centerline of the bend is represented by a mathematical parametric equation. express.

10. The method according to claim 9, characterized in that, The pressure drop calculation for the piping between components is based on the curvature data at the pipe bends, generating the pressure drop caused by the bends. The pressure drop calculation model for the bends includes: Pi=ζ(ρ / 2) ω² (L*K / 90°), Where P1 is the pressure loss of the bend, ζ is the drag coefficient, ρ is the density of the fluid, ω is the average velocity of the fluid in the pipe before the bend, L is the length of the bend, and K is the curvature of the bend.

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