Hybrid electric vehicles (HEVs) utilize multiple power sources to minimize fuel consumption, which, generally, comprises one or two electric motors added to the conventional configuration. Based on the power flows from the sources to the wheels, the powertrain configurations are classified into three different types, such as series, parallel, and power-split. Although the classification is helpful for engineers to understand the layout of the system, it might not be useful for analyzing the operation of the system. This study proposes new classification concept, so that the powertrain configurations can be classified into two categories according to the operating mode, as either a variable type or a fixed type, which can be very practical for building mathematical models and analyzing the systems. The mathematical models are developed based on parameters characterizing the operations, and the modeling technique is tested in four real-world hybrid vehicles in order to see the feasibility. The new classification concept brings significant advantages for engineers who want to study hybrid systems because it is possible to accelerate the development process by reusing the generic models even for different powertrain configurations, which can be used for analyzing, evaluating, and optimizing the hybrid powertrain systems.

混合动力电动汽车 (HEV) 利用多种动力源来最大限度地减少燃料消耗，通常在传统配置中增加一个或两个电动机。根据从源到车轮的动力流，动力系统配置分为三种不同的类型，例如串联、并联和动力分配。虽然分类有助于工程师了解系统的布局，但对于分析系统的运行可能没有用。本研究提出了新的分类概念，使得动力总成配置可以根据运行模式分为可变型和固定型两大类，这对于建立数学模型和分析系统非常实用。数学模型是基于表征操作的参数开发的，并且建模技术在四辆真实世界的混合动力汽车上进行了测试，以观察其可行性。新的分类概念为想要研究混合动力系统的工程师带来了显着优势，因为即使对于不同的动力系统配置，也可以通过重用通用模型来加速开发过程，可用于分析、评估和优化混合动力系统.