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In response to the lack of research on the performance, standards, and testing methods of Intelligent Speed Assistance (ISA) system for motor vehicles in China at present, this paper introduced the working principle of ISA, studied the typical test scenarios specified in EU 2021/1958. On this basis, a motor vehicles’ ISA performance testing system and scenario were developed and a road test of a passenger car’s ISA performance was carried out according to the standard. The results indicate that the test vehicle’s ISA system complies with the requirements of EU 2021/1958 and the higher the vehicle speed, the later the ISA system will recognize the speed limit sign and when developing ISA systems attention should be paid to the sensitivity of the ISA system to recognize the speed limit sign when the speed is high.
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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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