Engine - definition

An engine, also referred to as a range extender in certain vehicle architectures, is a system that converts stored energy into mechanical or electrical power to sustain vehicle operation. In conventional vehicles, the engine directly provides mechanical power to the wheels through the drivetrain. In range-extended applications, the engine’s primary role is to generate electricity rather than propel the vehicle directly.

A range extender is typically a compact internal combustion engine optimized to operate at a constant, efficient speed. Instead of responding continuously to driver input, it activates when the primary energy source is depleted or when additional energy is required. The generated electrical energy is used to power the traction motor or recharge the energy storage system, thereby extending the vehicle’s usable driving distance without significantly increasing battery size.

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