Mild hybrid vehicles, sometimes called micro-hybrids, are gasoline-powered vehicles equipped with a lightweight electric motor, battery, and software that work together to improve fuel efficiency compared to conventional vehicles. These systems recover energy during braking and coasting to provide power assists and restart the engine.

How do Mild Hybrid Systems Work?
Mild Hybrid Vehicles have a small electric motor, typically 10-20 horsepower, connected to the engine crankshaft or transmission. The motor is powered by a small lithium-ion battery pack. Key technologies in these systems include:

Belt-integrated Starter Generator (BSG)
A BSG is a starter motor that can also function as a generator. During braking or coasting, the BSG charges the battery by converting the vehicle's kinetic energy into electrical energy. This process is called regenerative braking.

Stop-start System
When the vehicle comes to a stop, the gasoline engine automatically shuts off to avoid idling waste. As soon as the brake is released or the accelerator is pressed, the BSG instantly restarts the engine.

Boost Assist
The electric motor provides extra torque to assist acceleration from a standing start or when passing. This allows the engine to operate more efficiently at lower rpms.

Potential Fuel Savings of Mild Hybrids
Compared to conventional vehicles, mild hybrids can offer fuel economy improvements of 5-10% according to automakers. Real-world driver results may vary depending on driving conditions and habits.

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