What is the difference between BSG and ISG?

[Castillo]

The difference between BSG and ISG lies in their hybrid power modes. Below are the relevant introductions: ISG (Integrated-Starter-Generator) represents a single-axis parallel medium hybrid mode: It combines the torque of the engine and motor for power blending. The engine, motor, and transmission are connected in parallel. Depending on different driving conditions, the torque of the engine and motor are combined in various ways before the transmission to achieve optimal driving efficiency. The engine serves as the main power source for the vehicle, while the motor system plays a role in 'peak shaving and valley filling.' BSG (Belt-driven-Starter-Generator) represents a dual-axis parallel mild hybrid mode: Power transmission between the engine and motor is achieved via a belt drive. The engine acts as the main driving power source, while the motor system is used for quick engine starts. Under normal driving conditions, the BSG motor, like a conventional car generator, is driven by the engine to generate electricity and charge the battery. When the vehicle stops, the engine operation ceases to eliminate idling. Upon restarting, the BSG motor quickly starts the engine.