A method for evaluating misuse prevention of an all-in-one seat belt fixing child restraint system

Abstract

The application provides a whole safety belt fixing child restraint system misuse evaluation method, 11 evaluation indexes are set to evaluate the structure and design of the CRS from different dimensions and part levels to place misuse risk. According to the misuse characteristics of each index, the objective scoring benchmark is determined, and according to the importance and harm degree of each index, the index weight coefficient is set, so that the evaluation method can avoid subjective factors as much as possible and systematically evaluate the misuse prevention ability of the CRS, which can provide reference for users and developers, thereby reducing the misuse risk of the product and improving the child riding safety performance.

Description

Technical Field

[0001] This invention relates to the field of automotive child safety testing, and more specifically, to a method for evaluating the prevention of misuse of an integrated seat belt child restraint system. 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 vehicle collisions by adjusting their seating height, posture, and load distribution. 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. Therefore, it is essential that the structural design of child restraint systems be as simple and easy to operate as possible to minimize the risk of misuse.

[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, resulting in a lack of cross-comparison of evaluation results. Therefore, a systematic and objective testing and evaluation method for preventing misuse of child restraint systems is needed to address these technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a method for evaluating the misuse prevention capability of an integrated child restraint system using a seat belt. By clarifying the scoring criteria for each evaluation indicator and setting the weight of the score, the misuse prevention capability of the child restraint system can be objectively scored.

[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 of an integrated child restraint system using a seatbelt, comprising the following steps:

[0007] Each evaluation indicator is scored;

[0008] Assign a weighting coefficient to each evaluation indicator;

[0009] Based on the scoring results and weighting coefficients, the ability of the CRS structure and design to prevent misuse risks is calculated.

[0010] The evaluation indicators include: 1. Factory integrity; 2. Seat belt path identifiability; 3. Seat belt path rationality; 4. Seat belt path weaving operability; 5. Seat belt slack elimination; 6. Seat belt path interference; 7. Seat belt guide device; 8. Locking clip; 9. Pull-up strap; 10. Support leg; 11. Anti-rebound device.

[0011] The ability of the CRS structure and design to prevent misuse risks is represented by a score, denoted as R, and is calculated as follows:

[0012]

[0013] Each evaluation indicator is scored according to a preset scoring criterion, denoted as p. i (i = 1, 2, ..., 11), maximum score 2, minimum score 0. All original scores for the CRS structural design section are represented by a column matrix P = [p1, p2, ..., p...]. 11 ] T Each evaluation indicator is assigned a weighting coefficient based on its importance, denoted as w. i (i = 1, 2, ..., 11), all weight coefficients form a row matrix W = [w1, w2, ..., w 11 ], whose value is W = [2,3,3,3,3,2,2,2,8,8,4].

[0014] If the product design does not use item 9 (upper strap) or item 10 (support leg), it can directly obtain a full score of 2 points; if the upper strap or support leg is required, it will be evaluated according to sub-indicators 9.1-9.3 and 10.1-10.3, and the sub-indicator score will be recorded as p. 9.1 p 9.2 p 9.3 and p 10.1 p 10.2 p 10.3 The sub-indicator weight coefficients are 0.1, 0.2, and 0.3 respectively. Calculate p9 and p... 10 Score: p9 = [p 9.1 ,p 9.2 ,p 9.3 ]×[0.1,0.2,0.3] T p 10 =[p 10.1 ,p 10.2 ,p 10.3 ]×[0.1,0.2,0.3] T .

[0015] Compared with the prior art, the technical advantages of the present invention are as follows:

[0016] This invention provides a method for evaluating the misuse prevention capability of an integrated universal seatbelt-secured child restraint system (CRS). It establishes 11 evaluation indicators to assess the structural and design-related misuse prevention capabilities of the CRS from different dimensions and component levels. Based on the characteristics of each indicator that could lead to misuse, objective scoring criteria are defined. Weighting coefficients are set for each indicator based on its importance and severity, enabling the evaluation method to minimize subjective factors and systematically evaluate 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

[0017] 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.

[0018] The purpose of this invention is to design an evaluation system for preventing misuse of integrated universal seat belt-type child restraint systems. It clarifies the scoring criteria for each evaluation indicator and sets weighted scores, objectively evaluating the misuse prevention capability of child restraint systems. 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.

[0019] Specifically, this embodiment evaluates the ability of the CRS structure and design to prevent misuse risks from 11 dimensions, with the following indicators:

[0020] 1. Factory integrity

[0021] 2. Seatbelt path identifiability

[0022] 3. Seatbelt route rationality

[0023] 4. Seatbelt path weaving operation

[0024] 5. Eliminate seatbelt slack

[0025] 6. Seatbelt path interference

[0026] 7. Seat belt guide device

[0027] 8. Locking clamp

[0028] 9. Top pull strap

[0029] 10. Supporting leg

[0030] 11. Anti-rebound device

[0031] Each evaluation indicator is scored according to the preset scoring criteria (see Table 1), and denoted as p. i (i = 1, 2, ..., 11), maximum score 2, minimum score 0. All original scores for the CRS structural design section are represented by a column matrix P = [p1, p2, ..., p...]. 11 ] T Each evaluation indicator is assigned a weight coefficient based on its importance, denoted as w. i (i = 1, 2, ..., 11), all weight coefficients form a row matrix W = [w1, w2, ..., w 11 The value is W = [2,3,3,3,3,2,2,2,8,8,4]. For items 9. Top pull strap and 10. Support leg, if the product design does not use the top pull strap or support leg, a full score of 2 points can be obtained directly; if the top pull strap or support leg is required, it will be evaluated according to sub-indicators 9.1-9.3 and 10.1-10.3. The sub-indicator score is denoted as p. 9.1 p 9.2 p 9.3 and p 10.1 p 10.2 p 10.3 The sub-indicator weight coefficients are 0.1, 0.2, and 0.3 respectively. Calculate p9 and p... 10 Score: p9 = [p 9.1 ,p 9.2 ,p 9.3 ]×[0.1,0.2,0.3] T p 10 =[p 10.1 ,p 10.2 ,p 10.3 ]×[0.1,0.2,0.3] T .

[0032] The final evaluation result is represented by the score rate, denoted as R, and is calculated as follows:

[0033]

[0034] Table 1. Scoring System and Criteria for Misuse Prevention

[0035]

[0036]

[0037]

[0038] The evaluation process was conducted by personnel familiar with and possessing basic knowledge of child restraint system terminology. The following table was used for item-by-item testing and evaluation, with scores assigned. The final evaluation result can be directly calculated using the formula in the table, as shown in Table 2. The final evaluation result for this integrated child restraint system is 80.8%. Three main problems were identified from the score: ① The seatbelt path has gaps, which may lead to incomplete installation during use; ② Due to numerous bends in the seatbelt path, the tension required to eliminate slack is large, potentially leaving excessive slack during use, thus reducing the collision protection performance of the child restraint system; ③ Although no points were lost in any sub-indicators due to the use of support legs, a perfect score was still not achieved. This is because in integrated universal seatbelt-fixed child restraint systems, the seatbelt is the primary fixation method, and the support legs, as an auxiliary anti-rollover device, are easily overlooked or misused by users. A better design would be one that optimizes the product design and mechanism to ensure that only the seatbelt as the primary fixation method meets the standard requirements for child occupant protection performance.

[0039] Table 2 Examples of Misuse Prevention Scoring

[0040]

[0041]

[0042] 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 evaluating the misuse prevention of an integrated child restraint system using a seatbelt, characterized in that, Includes the following steps: Each evaluation indicator is scored; Assign a weighting coefficient to each evaluation indicator; Based on the scoring results and weighting coefficients, calculate the CRS structure and design's ability to prevent misuse risks; The evaluation indicators include:

1. Factory integrity; 2. Seat belt path identifiability; 3. Seat belt path rationality; 4. Seat belt path weaving operability; 5. Seat belt slack elimination; 6. Seat belt path interference; 7. Seat belt guide device; 8. Locking clip; 9. Pull-up strap; 10. Support leg; 11. Anti-rebound device; The ability of a CRS structure and design to prevent the risk of misuse is represented by a score, denoted as [missing value]. R The calculation method is as follows: ； Each evaluation indicator is scored according to a preset scoring criterion, and recorded as follows: The highest score is 2 points, and the lowest score is 0 points. All original scores for the CRS structural design section are recorded as a column matrix. Each evaluation indicator is assigned a weighting coefficient based on its importance, denoted as . All weight coefficients form a row matrix Its value is .

2. The method for evaluating the misuse prevention of an integrated child restraint system using a seatbelt according to claim 1, characterized in that, If the product design does not use item 9 (upper strap) or item 10 (support leg), it will receive a full score of 2 points. If the upper strap or support leg is required, it will be evaluated according to sub-indicators 9.1-9.3 and 10.1-10.3, with the sub-indicator scores recorded as follows: and The sub-indicator weight coefficients are 0.1, 0.2, and 0.3 respectively. Calculation and Score: , .

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