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To enhance the fuel economy of the certain series-parallel hybrid commercial vehicle, a control strategy for optimizing engine speed based on the overall system efficiency has been proposed. This strategy comprehensively considers factors such as engine fuel consumption, planetary gear set mechanical losses, power losses during motor generation/driving/idling, controller power losses, and the conversion relationship between mechanical and electrical energy. Mathematical and control models for the series-parallel hybrid powertrain system have been established, with the objective of maximizing powertrain efficiency. Through iterative analysis of vast amounts of data, optimal solutions for engine speed and torque have been obtained. Simulation results indicate that, compared to a speed control strategy based solely on optimizing engine efficiency, the proposed strategy for optimizing overall system efficiency reduces vehicle fuel consumption by 7.9% under cyclic operating conditions. Finally, a series-parallel hybrid powertrain test bench is set up to verify the effectiveness of the control strategy, and the optimization effect on fuel economy is found to be significant.
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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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