Full
Outline
To accurately evaluate the decision precision of Automatic Emergency Braking (AEB) system intervention timing under varying load conditions in highway scenarios, this study screens 255 commercial vehicle rear-end collision cases from the China In-Depth Accident Study (CIDAS) database and extracts typical scenarios using hierarchical clustering. The clustering variables encompass traffic environment (weather, road type, lighting, and adhesion conditions), subject vehicle type, pre-crash status, and collision characteristics (load state, motion state, impact location, and initial speed discretized into 4 intervals: low, medium, high, and extremely high), as well as target vehicle type and motion state. 4 highly representative test scenarios are obtained, in which the load state is innovatively incorporated as a key clustering variable into the accident data structure analysis. Combined with vehicle dynamics principles, the influence of load on braking distance and AEB response threshold is discussed, enabling the extracted scenarios to simultaneously reflect statistical patterns in accident data and practical braking characteristics of commercial vehicles, thereby addressing the deficiency of existing studies in considering load factors. The constructed scenarios satisfy the requirements of UN R131 regulation and are further extended to beyond-regulation speeds and offset-overlap conditions, significantly enhancing adaptability to the complex traffic environment on Chinese highways. This paper provides a scientific basis for commercial vehicle AEB development, performance optimization, and standard formulation and revision.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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