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The steer-by-wire technology is the key technology for the future development of pure electric vehicles, as the key execution system of the X-by-wire chassis, the mechanical connection is canceled, the steering operation is directly transmitted by electrical signals, the control mode is more flexible, the modular structure can be realized, the coupling and control freedom between the steering system and other subsystems of the chassis are improved. Therefore, the steer-by-wire system is an important part of the drive-by-wire chassis system. In order to provide a useful reference for R&D units and enterprises related to steer-by-wire technology, this paper uses patent analysis method to sort out key technical points in steering strategies, integrated systems and other aspects from the perspective of patent disclosure trend and patent technology composition. This paper also analyzes the development status of steer-by-wire technology of pure electric vehicles from macro and micro perspectives, proposes the key directions for future patent layout in the field of steer-by-wire for pure electric vehicle in China.
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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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