High-speed noise reduction design method for sealing strip of panoramic sunroof of vehicle

Abstract

The invention provides a high-speed noise reduction design method for a sealing strip of a panoramic sunroof of a vehicle. The high-speed noise reduction design method aims at the sealing strip at a gap between front glass and rear glass of an outward sliding type panoramic sunroof. Based on the deformation of the height difference of the front glass and the rear glass of the panoramic sunroof under the high-speed wind load and the installation tolerance of the front glass and the rear glass on the roof, the interference amount T between the sealing strip and the front glass covering edge is calculated, and # imgabs0 # h1 represents the height difference of the front glass and the rear glass under the wind-load-free condition; h2 represents the height difference between the front glass and the rear glass under the high-speed wind load condition; t1 represents the Z-direction installation adjustment amount tolerance of the front glass assembly; t2 represents the Z-direction installation adjustment amount tolerance of the rear glass assembly; t3 represents the precision of the surface difference detection tool; a represents the standard grade of the Sigma quality system. Through the method, the high-speed wind noise performance of the skylight can be improved, and wind noise such as cross ventilation of the rear portion of the sliding glass of the skylight under the high-speed / headwind form condition is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of automobile sunroofs, and in particular to a high-speed noise reduction design method for a sealing strip of a panoramic sunroof of a vehicle. Background Art

[0002] At present, in the vehicle design and development stage, there is no accurate tolerance calculation method for the sealing strip at the rear end of the front sliding glass of the outward-sliding panoramic sunroof. The bubble-shaped design of the sealing strip lacks theoretical support and relies entirely on experience, resulting in no guarantee for the high-speed wind noise performance of the sunroof.

[0003] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle, thereby improving the high-speed wind noise performance of the sunroof.

[0005] The technical solution adopted by the present invention is:

[0006] A high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle is provided. For an outward-sliding panoramic sunroof, the interference amount between the sealing strip and the front glass edging is calculated based on the deformation amount of the height difference between the front and rear glasses of the panoramic sunroof under high-speed wind load and the installation tolerance amount of the front and rear glasses on the roof; wherein the sealing strip is the sealing strip at the middle gap between the front and rear glasses of the panoramic sunroof.

[0007] Furthermore, the deformation amount of the height difference between the front and rear glasses of the panoramic sunroof under high-speed wind load is h=h2-h1; wherein h1 represents the height difference between the front and rear glasses under no wind load conditions; and h2 represents the height difference between the front and rear glasses under high-speed wind load conditions.

[0008] Furthermore, the installation tolerances of the front and rear glass on the roof include: the Z-direction installation adjustment tolerance t1 of the front glass assembly, the Z-direction installation adjustment tolerance t2 of the rear glass assembly, and the flushness detection tooling accuracy t3.

[0009] In some embodiments, the interference amount T between the sealing strip and the front glass edge is calculated according to the following formula:

[0010]

[0011] Among them, a represents the Sigma quality system standard level.

[0012] In some embodiments, the interference amount T between the sealing strip and the front glass edge is calculated according to the following formula:

[0013]

[0014] Among them, a represents the Sigma quality system standard level and s represents the safety margin.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The high-speed noise reduction design method for the vehicle panoramic sunroof sealing strip of the present invention can improve the one-time pass rate of the high-speed wind tunnel test of the whole vehicle, improve the high-speed wind noise performance of the sunroof, make the early design more reasonable, and avoid the formation of wind noise such as through-drafts behind the sunroof sliding glass in high-speed / headwind conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the vehicle panoramic sunroof structure and installation tolerance is shown. DETAILED DESCRIPTION

[0019] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0020] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". Other explicit and implicit definitions may also be included below.

[0021] like Figure 1 As shown, the present invention provides a high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle, which is aimed at a sealing strip 3 at the gap between the front glass 1 and the rear glass 2 of an outward sliding panoramic sunroof. Based on the deformation of the height difference between the front and rear glass of the panoramic sunroof under high-speed wind load and the installation tolerance of the front and rear glass on the roof, the interference between the sealing strip and the front glass edging is calculated.

[0022] The deformation of the height difference of the front and rear glass of the panoramic sunroof under high-speed wind load is h=h2-h1. h1 represents the height difference of the front and rear glass under no wind load (wind speed is 0, that is, the whole vehicle is relatively stationary with the wind speed). The height difference of the front and rear glass is the height difference between the front edge of the front glass and the rear edge of the rear glass. h2 represents the height difference of the front and rear glass under high-speed wind load conditions. The high-speed wind load conditions specify the wind speed according to the development speed of the whole vehicle.

[0023] The installation tolerances of the front and rear glass on the roof include: the Z-direction installation adjustment tolerance t1 of the front glass assembly, the Z-direction installation adjustment tolerance t2 of the rear glass assembly, and the surface difference detection tooling accuracy t3. The Z-direction installation adjustment tolerance of the glass assembly is the extreme value of the deviation relative to the nominal position.

[0024] In a specific embodiment, the interference amount T between the sealing strip 3 and the front glass rim (front glass PU) 4 is calculated according to the following formula: a represents the Sigma quality system standard level. For example, if the quality system standard is 4Sigma, then a=4.

[0025] In another specific embodiment, the interference amount T between the sealing strip 3 and the front glass rim (front glass PU) 4 is calculated according to the following formula: a represents the Sigma quality system standard level, s represents the safety margin, and s is the empirical value.

[0026] In an example embodiment, a wind load simulation calculation is performed for a certain development vehicle model, and it is found that under high-speed wind load conditions, the Z-direction height difference of the front and rear glass (the height difference between the front glass front edge and the rear glass rear edge) h2 = = 0.585mm. The Z-direction height difference of the front and rear glass under no wind load conditions (wind speed is 0) is h1 = 0.2mm. The Z-direction installation adjustment tolerance of the front glass assembly is t1 = 2mm, and the Z-direction installation adjustment tolerance of the rear glass assembly is t2 = 2mm. That is, the Z-direction adjustment tolerance of the front and rear glass assemblies is ±2mm, and the deviation limit relative to the nominal position is 2mm. The surface difference detection tooling accuracy is t3 = 0.3mm. The 4Sigma quality system standard is adopted, and a = 4.

[0027] Interference T between the sealing strip 3 and the front glass edging (front glass PU) 4:

[0028]

[0029] Products developed based on this calculation result have good high-speed wind noise performance.

[0030] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A high-speed noise reduction design method for a vehicle panoramic sunroof sealing strip, for an outward sliding panoramic sunroof, characterized in that: The interference between the sealing strip and the front glass edging is calculated based on the deformation of the height difference between the front and rear glasses of the panoramic sunroof under high-speed wind load and the installation tolerance of the front and rear glasses on the roof; wherein the sealing strip is the sealing strip at the middle gap between the front and rear glasses of the panoramic sunroof.

2. A high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle as claimed in claim 1, characterized in that: The deformation amount of the height difference between the front and rear glass of the panoramic sunroof under high-speed wind load is h=h2-h1; wherein h1 represents the height difference between the front and rear glass under no wind load conditions; h2 represents the height difference between the front and rear glass under high-speed wind load conditions.

3. A high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle as claimed in claim 2, characterized in that: The installation tolerances of the front and rear glass on the roof include: the Z-direction installation adjustment tolerance t1 of the front glass assembly, the Z-direction installation adjustment tolerance t2 of the rear glass assembly, and the surface difference detection tooling accuracy t3.

4. A high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle as claimed in claim 3, characterized in that: The interference T between the sealing strip and the front glass edge is calculated according to the following formula: Among them, a represents the Sigma quality system standard level.

5. The high-speed noise reduction design method for a panoramic sunroof sealing strip of a vehicle as claimed in claim 3, characterized in that: The interference T between the sealing strip and the front glass edge is calculated according to the following formula: Among them, a represents the Sigma quality system standard level and s represents the safety margin.

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