This study aims to understand the difference in operational performance between electric, hybrid, and diesel buses in Portland, OR. We estimated a running time model, and a distance until a breakdown occurs model using ordinary least squares and multilevel regression frameworks. The results of the running time model suggest that electric buses are faster than diesel buses while controlling for all other operating characteristics. Whilst electric buses do break down sooner if the ramp is used more often, more stops made along the route served by the electric buses increase the distance traveled by the electric buses until a breakdown occurs. Public transport operators are encouraged to continue deploying electric buses, especially along shorter routes with numerous stops, and to undergo preventive maintenance every two weeks. It is also recommended to deploy electric buses to routes where the ramp use is known to be historically infrequent in the short term.

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美国俄勒冈州波特兰市电池电动公交车交通运营的实证分析

本研究旨在了解俄勒冈州波特兰市电动、混合动力和柴油公交车之间运行性能的差异。我们使用普通最小二乘法和多级回归框架估计了运行时间模型以及发生故障之前的距离模型。运行时间模型的结果表明，在控制所有其他运行特性的情况下，电动公交车比柴油公交车更快。虽然如果更频繁地使用坡道，电动公交车确实会更快出故障，但沿电动公交车服务的路线停靠的次数越多，就会增加电动公交车行驶的距离，直到发生故障。鼓励公共交通运营商继续部署电动公交车，特别是在停靠点较多的较短路线上，并每两周进行一次预防性维护。还建议在历史上短期内很少使用坡道的路线上部署电动公交车。