碳排放、自然资源枯竭、交通拥堵以及化石燃料成本不断攀升,所有这些问题正在迫使全球寻求可替代的交通运输方式。城市公交客车如果使用混合动力推进系统,就能将排放减少多达75%。混合动力(HEV)客车(或插电式混合动力(PHEV)客车)采用电动机和以最高工作效率运行的小型传统内燃机驱动。一般来说有两种不同类型的混合动力系统,即并行混合动力系统和串行混合动力系统。采用何种类型的混合动力系统主要取决于客车的工作循环效益。两种混合动力系统均采用了制动能量回收系统。该系统由超级电容器构成,几乎能吸收并存储制动时产生的全部动能,以供后续系统推进时所需。
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