那么，是什么引起混合动力汽车的蓄电池组放电如此严重呢？

So, what could trigger such a deep discharge in a hybrid’s battery?

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研究开发了混合动力电动车(HEV)中的辅助动力系统，采用一台小排量的发动机组成发电机组，既可以给电池组充电，发动机也可以直接驱动空调系统。

In this paper, the assistant power system of hybrid electrical vehicle (HEV) was an engine with small displacement, which could charge the battery and directly drive the air-conditioning system.

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研究串联型混合电动大客车动力驱动系统关键部件，如牵引电机、发电机组和电池组性能参数的匹配以及“恒温器”控制策略。

Powertrain system for a series hybrid electric bus is studied. The study includes the performance parameters matching of key components and the "thermostat" control strategy.

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