What is the working principle of hybrid electric power?

[Frodo]

There are three working principles for hybrid electric vehicles: 1. Parallel mode: The engine serves as the main power source, while the motor acts as an auxiliary power source. This method primarily relies on the engine for driving, utilizing the motor's strong power characteristics during restart. 2. Low-speed motor-only driving: At low speeds, the motor drives the vehicle, and as speed increases, the engine and motor operate in a 'series-parallel mode' for efficient power sharing. This approach requires power-sharing devices and generators, resulting in a complex structure. 3. Series mode: The engine functions solely as a power source, with the vehicle being driven by the motor. The drive system consists of only a motor. However, since it still requires a fuel engine, it is also classified as a hybrid vehicle.