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To enhance driving performance during drive mode transitions in battery electric vehicles, a controllable disengagement device is integrated between the front axle electric drive assembly and the differential, enabling timely switching between four-wheel-drive (4WD) and two-wheel-drive (2WD) modes. First, a dual-motor four-wheel-drive pure electric vehicle configuration incorporating the disengagement device is constructed, and the energy flow characteristics of 2WD and 4WD modes are analyzed. Second, mode transition conditions are designed based on driving scenario requirements, and a phased torque transfer control strategy is developed. Finally, seven categories of drivability evaluation scenarios are proposed, along with objective evaluation metrics. Experimental validation demonstrates that the proposed configuration significantly enhances the vehicle’s driving performance and ride comfort.
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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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