插电式混合动力汽车高压塑料燃油箱设计

Design of Plug-in Hybrid Electric Vehicle High Pressure Plastic Fuel Tank

针对插电式混合动力汽车在纯电模式驱动、发动机长期不工作、无法对燃油箱碳罐进行有效脱附清洗的问题,提出提高燃油箱承压能力、密封燃油蒸汽于燃油箱内部、减少碳罐荷载的解决方案。由于塑料燃油箱自身材料力学性能不足,结合其两片吹塑成型工艺特点,在其吹塑成型过程中,放置若干内置立柱于燃油箱本体内部,连接上下表面提高强度。塑料燃油箱样件在82℃环境箱中,经过12000次-14.9~35kPa交变内压作用后,燃油箱本体无泄漏,内置立柱均完好,满足了设计要求。

For plug-in hybrid electric vehicles driven in pure electric mode,the engine does not work for a long time and it is unable to effectively purge and clean the carbon.The solution of improving the capacity of fuel tank resistance-pressure,sealing fuel vapor inside fuel tank and reducing carbon tank load was put forward.Due to the weak material mechanical properties of the plastic fuel tank,combined with the characteristics of two sheets blow molding process,in the process of its blow molding,a number of stand offs were placed inside the fuel tank body,connecting the upper and lower surfaces to improve the strength.A plastic fuel tank sample was placed in 82℃environment chamber,to bear 12 000 cycles of-14.9~35 kPa alternating internal pressure.The environmental result shows the fuel tank body has no leaking and all stand offs are in good condition.So the designed fuel tank body meets the design requirements.