A non-integral child restraint system misuse-resistant test evaluation method

Abstract

The application discloses a kind of non-integral child restraint system misuse-proof test evaluation methods, from CRS itself regulation, CRS installation on vehicle and child dummy on CRS three aspects of ride are evaluated, wherein CRS itself regulation part sets up 5 evaluation projects, CRS installation on vehicle part sets up 3 evaluation projects, and child dummy on CRS sets up 7 evaluation projects.Rigorous, objective score benchmark and project weight are set for each evaluation project, subjective factors can be avoided as far as possible and CRS misuse-proof capability is systematically evaluated, to provide reference for user and developer, thereby reduce product misuse risk, improve child car safety performance.

Description

Technical Field

[0001] This invention relates to the field of automotive child safety testing, and more specifically, to a method for testing and evaluating the prevention of misuse of non-integral child restraint systems. Background Technology

[0002] Child restraint systems (CRS) are crucial for child passenger safety, addressing the issue that seatbelts and other restraint systems are only suitable for adults and not children. They reduce the risk of injury to children in collisions by adjusting their seating height, posture, and load distribution. Non-integral child restraint systems (CRS) have their restraining force control system directly connected to the vehicle, with the seatbelt as the primary installation method, possibly supplemented by auxiliary devices such as ISOFIX anchor points. However, due to varying levels of understanding among consumers and parents, misuse of CRS during installation and use is common, leading to reduced collision protection capabilities and even more serious secondary injuries. Misuse of this type of CRS manifests in three aspects: the system's own adjustments, its installation in the vehicle, and its suitability for children. Therefore, it is essential that the structural design of child restraint systems be as simple and easy to operate as possible, and that labeling and instruction manuals provide clear and accurate guidance.

[0003] However, current evaluations of the misuse prevention capabilities of child restraint systems rely primarily on the subjective judgment of experienced engineers and lack a systematic approach. Therefore, it is necessary to design a systematic and objective testing and evaluation method for preventing the misuse of child restraint systems. Summary of the Invention

[0004] The purpose of this invention is to design a testing and evaluation method for preventing misuse of non-integrated child restraint systems. This method is an evaluation system for preventing misuse of non-integrated child restraint systems, clearly defining the scoring criteria and assigning weights to each evaluation item, thus objectively scoring the misuse prevention capability of the child restraint system. This evaluation method does not rely on engineering experience and minimizes the differences in subjective human evaluation. It can be applied not only to product performance evaluation but also to identifying major defects and guiding product development.

[0005] To achieve the objectives of this invention, the technical solution provided by this invention is as follows:

[0006] A method for evaluating the misuse prevention capabilities of non-integral child restraint systems, where the overall score rate, denoted as R, is used to assess the misuse prevention ability of these systems. The calculation method is as follows:

[0007] R = 0.3 × R1 + 0.3 × R2 + 0.4 × R3

[0008] The evaluation results of the CRS autoregulatory component are represented by a score rate, denoted as R1, which accounts for 30% of the weight.

[0009] The evaluation results of the CRS installation aspect on the vehicle are represented by a score rate, denoted as R2, which accounts for 30% of the weight.

[0010] The evaluation results of the rideability of the child dummy on the CRS are represented by a score, denoted as R3, which accounts for 40% of the weight.

[0011] The self-adjustable part of the CRS has five evaluation items: 1.1. Use of functional components; 1.2. Installation mode conversion; 1.3. Adjustment of CRS height and width; 1.4. Removal and installation of CRS seat back; 1.5. Use of ISOFIX connection device.

[0012] For each evaluation item, a score is given according to the preset scoring criteria, denoted as p. 1.i (i = 1, 2, ..., 5), maximum score 2, minimum score 0; all original scores of the CRS self-adjustment component are denoted as column matrix P1 = [p 1.1 ,p 1.2 ,……,p 1.5 ] T Each evaluation item is assigned a weighting coefficient based on its importance, denoted as w. 1.i (i = 1, 2, ..., 5), all weight coefficients form a row matrix W1 = [w 1.1 ,w 1.2 ,……,w 1.5 The value of R1 is W1 = [2,2,2,2,2]; where R1 is calculated as follows:

[0013] If the following three evaluation items are not applicable: 1.2. Installation mode conversion, 1.4. CRS seat back assembly / disassembly, and 1.5. ISOFIX connection device usage, then the item score and weight coefficient for each evaluation item will be set to 0, i.e., p 1.2 =p 1.4 =p 1.5 =0, w 1.2 =w 1.4 =w 1.5 =0.

[0014] The CRS installation on the vehicle has three evaluation items: 2.1. ISOFIX connection, 2.2. ISOFIX connection positioning indication, and 2.3. Built-in CRS adjustment.

[0015] Each evaluation item is scored according to preset scoring criteria, denoted as p. 2.i(i = 1, 2, 3), maximum score 2, minimum score 0; all raw scores for the CRS installation component on the vehicle are denoted as column matrix P2 = [p 2.1 ,p 2.2 ,p 2.3 ] T Each evaluation item is assigned a weighting coefficient based on its importance, denoted as w. 2.i (i = 1, 2, 3), all weight coefficients form a row matrix W2 = [w 2.1 ,w 2.2 ,w 2.3 The value of R2 is W2 = [3, 4, 3], and the calculation method for R2 is as follows:

[0016] If the three evaluation items 2.1. ISOFIX connection device connection, ISOFIX connection device positioning indication, and built-in CRS adjustment are not applicable, then the item score and weight coefficient for each evaluation item will be set to 0, i.e., p 2.1 =p 2.2 =p 2.3 =0, w 2.1 =w 2.2 =w 2.3 =0.

[0017] The evaluation criteria for the ride comfort of child dummies on the CRS system include seven items: 3.1. Seatbelt path identifiability, 3.2. Seatbelt path rationality, 3.3. Seatbelt lap belt fastening, 3.4. Seatbelt shoulder belt fastening, 3.5. Elimination of CRS slack after installation, 3.6. Elimination of child dummy forward and backward slack, and 3.7. Seatbelt guiding device.

[0018] Each evaluation item is scored according to the preliminary scoring criteria, denoted as p. 3.i (i = 1, 2, ..., 7), highest score 2, lowest score 0; all original scores of the child dummy's ride-related portion on the CRS are denoted as column matrix P3 = [p 3.1 ,p 3.2 ,……,p 3.7 ] T Each evaluation item is assigned a weighting coefficient based on its importance, denoted as w. 3.i (i = 1, 2, ..., 7), all weight coefficients form a row matrix W3 = [w 3.1 ,w 3.2 ,……,w 3.7 The value of W3 is [2,2,1,1,1,1,2], where,

[0019] The method for calculating R3 is as follows:

[0020] When evaluating the rideability of child dummies on the CRS, a Q-series child dummy must be ridden in the CRS, and the child dummy must be the largest dummy covered by the child restraint system.

[0021] Compared with the prior art, the technical advantages of the present invention are as follows:

[0022] This invention provides a method for evaluating the misuse prevention capability of non-integrated child restraint systems (CRS). The evaluation considers three aspects: the self-adjustability of the CRS, its installation in the vehicle, and the comfort of a child dummy within the CRS. The self-adjustability assessment includes five items, the vehicle installation assessment includes three items, and the comfort of a child dummy within the CRS includes seven items. Clear and objective scoring criteria and weights are established for each assessment item, minimizing subjective factors and systematically evaluating the CRS's misuse prevention capability. This provides a reference for users and developers, thereby reducing the risk of product misuse and improving child passenger safety. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention evaluates the CRS from three aspects: self-adjustability, installation of the CRS in the vehicle, and the ride comfort of the child dummy on the CRS, with each aspect accounting for 30%, 30%, and 40% of the weight. Finally, based on the evaluation results of the three aspects and their weights, the misuse prevention capability of the non-integral child restraint system is calculated.

[0025] Specifically as follows:

[0026] Five evaluation items are established for the self-adjusting aspect of CRS, namely:

[0027] 1.1. Use of functional components

[0028] 1.2. Installation Mode Conversion

[0029] 1.3. Adjusting CRS height and width

[0030] 1.4. Removal and installation of CRS seat backrests

[0031] 1.5. Use of ISOFIX connectors

[0032] Each evaluation item is scored according to the preset scoring criteria (see Table 1), denoted as p. 1.i(i = 1, 2, ..., 5), maximum score 2, minimum score 0, all original scores of the CRS self-adjustment component are denoted as column matrix P1 = [p 1.1 ,p 1.2 ,……,p 1.5 ] T Each evaluation item is assigned a weighting coefficient based on its importance, denoted as w. 1.i (i = 1, 2, ..., 5), all weight coefficients form a row matrix W1 = [w 1.1 ,w 1.2 ,……,w 1.5 The value is W1 = [2,2,2,2,2]. Among these, 1.2. Installation mode conversion, 1.4. CRS seat backrest removal and installation, and 1.5. ISOFIX connection device use may not be applicable depending on the structural design of different child restraint systems. If not applicable, the item score and weight coefficient are both counted as 0, i.e., p 1.2 =p 1.4 =p 1.5 =0, w 1.2 =w 1.4 =w 1.5 =0.

[0033] The evaluation result of the CRS automodulation component is represented by a score rate, denoted as R1, and is calculated as follows:

[0034]

[0035] Regarding the installation of CRS on vehicles, three evaluation items are established:

[0036] 2.1. Connection of ISOFIX connectors

[0037] 2.2. ISOFIX Connection Device in Position Indication

[0038] 2.3. Built-in CRS adjustment

[0039] Each evaluation item is scored according to the preset scoring criteria (see Table 1), denoted as p. 2.i (i = 1, 2, 3), maximum score 2, minimum score 0, all original scores of the CRS installation aspect on the vehicle are denoted as column matrix P2 = [p 2.1 ,p 2.2 ,p 2.3 ] T Each evaluation item is assigned a weighting coefficient based on its importance, denoted as w. 2.i (i = 1, 2, 3), all weight coefficients form a row matrix W2 = [w 2.1 ,w 2.2 ,w 2.3], its value is W2=[3,4,3]. Among them, 2.1. ISOFIX connection device connection, ISOFIX connection device positioning indication and built-in CRS adjustment may not be applicable depending on the structural design of different child restraint systems. If not applicable, the item score and weight coefficient are all counted as 0, that is, p 2.1 =p 2.2 =p 2.3 =0, w 2.1 =w 2.2 =w 2.3 =0.

[0040] The evaluation results of the CRS's installation performance on the vehicle are represented by a score percentage, denoted as R2, and calculated as follows:

[0041]

[0042] Seven evaluation items were established for the ride comfort of child dummies on the CRS, namely:

[0043] 3.1 Seatbelt path identifiability

[0044] 3.2. Seatbelt route rationality

[0045] 3.3. Seat belt lap belt application

[0046] 3.4. Seatbelt shoulder strap fastening

[0047] 3.5. Elimination of looseness after CRS installation

[0048] 3.6. Elimination of relaxation after the child dummy leans forward (approximately 45°).

[0049] 3.7. Seatbelt Guide Device

[0050] This part of the evaluation requires riding a Q-series child dummy in the CRS. The child dummy is the largest dummy covered by this child restraint system. Each evaluation item is scored according to preset scoring criteria (see Table 1), denoted as p. 3.i (i = 1, 2, ..., 7), maximum score 2, minimum score 0, the original scores of the child dummy on the CRS ride-related portion are denoted as column matrix P3 = [p 3.1 ,p 3.2 ,……,p 3.7 ] T Each evaluation item is assigned a weighting coefficient based on its importance, denoted as w. 3.i (i = 1, 2, ..., 7), all weight coefficients form a row matrix W3 = [w 3.1 ,w 3.2 ,……,w 3.7 ], whose value is W3 = [2,2,1,1,1,1,2].

[0051] The evaluation results of the ride comfort section of the child dummy on the CRS are represented by a score rate, denoted as R3, and calculated as follows:

[0052]

[0053] In summary, the ability of non-integrated child restraint systems to prevent misuse is reflected in the overall score rate, denoted as R, and calculated as follows:

[0054] R=0.3×R1+0.3×R2+0.4×R3.

[0055] Table 1. Scoring System and Criteria for Misuse Prevention

[0056]

[0057]

[0058]

[0059]

[0060]

[0061] Finally, it should be noted that the above embodiments are merely illustrative and explanatory of the present invention, and are not intended to limit the present invention to the scope of the described embodiments. Furthermore, those skilled in the art will understand that the present invention is not limited to the above embodiments, and many more variations and modifications can be made based on the teachings of the present invention, all of which fall within the scope of protection claimed by the present invention.

Claims

1. A method for testing and evaluating the misuse prevention capabilities of a non-integral child restraint system, characterized in that the misuse prevention capability of the non-integral child restraint system is reflected by the overall score rate, denoted as R, and the calculation method is as follows: ; The evaluation results of the CRS automodulation component are represented by a score rate, denoted as . It accounts for 30% of the weight; The evaluation results of the CRS's installation on the vehicle are represented by a score rate, denoted as . It accounts for 30% of the weight; The evaluation results of the ride comfort aspect of the child dummy on the CRS are represented by a score rate, denoted as: It accounts for 40% of the weight; The self-adjustable portion of the CRS has five evaluation items: 1.

1. Use of functional components; 1.

2. Switching between installation modes; 1.

3. Adjustment of CRS height and width; 1.

4. Removal and installation of CRS seat backrests; 1.

5. Use of ISOFIX connectors; For each evaluation item, a score is given according to the preset scoring criteria, and recorded as follows: The highest score is 2 points, and the lowest score is 0 points; all the original scores of the self-adjusting part of CRS are recorded as a column matrix. Each evaluation item is assigned a weighting coefficient based on its importance, denoted as . All weight coefficients form a row matrix Its value is ;in, The calculation method is as follows: .

2. The method for testing and evaluating the prevention of misuse of a non-integral child restraint system according to claim 1, characterized in that, If 1.

2. Installation mode conversion, If the three evaluation items 1.

4. Removal and installation of CRS seat backrests and 1.

5. Use of ISOFIX connection devices are not applicable, then the item score and weight coefficient for each evaluation item shall be counted as 0, i.e. , .

3. The method for testing and evaluating the prevention of misuse of a non-integrated child restraint system according to claim 1, characterized in that, CRS establishes three evaluation items for vehicle installation: 2.

1. Connection of ISOFIX connector; 2.

2. ISOFIX connector positioning indicator; 2.

3. Built-in CRS adjustment; Each evaluation item is scored according to preset scoring criteria, and recorded as follows: The highest score is 2 points, and the lowest score is 0 points; all the original scores of the CRS installation portion on the vehicle are denoted as a column matrix. ; Each evaluation item is assigned a weighting coefficient based on its importance, denoted as [calculation]. All weight coefficients form a row matrix Its value is ,in The calculation method is as follows: .

4. The method for testing and evaluating the prevention of misuse of a non-integrated child restraint system according to claim 3, characterized in that, If the three evaluation items 2.

1. ISOFIX connection device connection, ISOFIX connection device positioning indication, and built-in CRS adjustment are not applicable, then the item score and weight coefficient for each evaluation item shall be set to 0, i.e. , .

5. The method for testing and evaluating the prevention of misuse of a non-integrated child restraint system according to claim 1, characterized in that, The ride comfort of the child dummy on the CRS includes seven evaluation items: 3.

1. Seatbelt path recognition, 3.

2. Seatbelt path rationality, 3.

3. Seatbelt lap belt fastening, 3.

4. Seatbelt shoulder belt fastening, 3.

5. Elimination of CRS slack after installation, 3.

6. Elimination of child dummy forward and backward slack, and 3.

7. Seatbelt guiding device. Each evaluation item is scored according to the preliminary review scoring criteria, and recorded as follows: The highest score is 2 points, and the lowest score is 0 points; all the original scores of the child dummy's riding performance on the CRS are recorded as a column matrix. Each evaluation item is assigned a weighting coefficient based on its importance, denoted as . All weight coefficients form a row matrix Its value is ,in, The calculation method is as follows: .

6. The method for testing and evaluating the prevention of misuse of a non-integral child restraint system according to claim 5, characterized in that, When evaluating the rideability of a child dummy on the CRS, a Q-series child dummy must be ridden in the CRS, and the child dummy must be the largest dummy covered by the child restraint system.

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