What is b on a prius?

In the context of a Toyota Prius, "b" typically stands for the regenerative braking system, also known as the "B mode."

The regenerative braking system in a Prius allows the vehicle to recover and store energy that is typically lost during normal braking. This energy is then used to charge the hybrid battery, increasing overall fuel efficiency. The "B mode" is an option on the Prius that enhances the regenerative braking effect by increasing the intensity of energy captured during braking.

When the driver engages the "B mode," the Prius will utilize the electric motor to provide a stronger braking effect. It essentially increases the level of energy regeneration, allowing for a more aggressive engine braking experience. This can be particularly useful when going downhill or slowing down, as it minimizes the need to use the traditional friction brakes, reducing wear and tear on the brake pads.

The "B mode" enhances the Prius's overall fuel economy and can contribute to a smoother driving experience, especially in situations that require frequent and extended braking. It is important to note that the "B mode" should be used appropriately and in accordance with the road and traffic conditions for optimal effectiveness and safety.

It's worth mentioning that the specifics of implementing the "B mode" can vary slightly in different years and models of the Prius. Therefore, it is recommended to consult the vehicle's owner's manual for precise instructions on how to engage and use the regenerative braking system in your specific Prius model.