The Blue Aiming Bar explained
We do our best to make things as intuitive and clear as possible, but sometimes that doesn’t work, or the idea presented simply needs some explanation. The blue aiming bar shown in the driving and braking screens, and soon to be released in the consumption screen too, might be one of those. So, here goes……
The Aiming Bar is always displayed under a Braking Torque bar. Braking Torque is the force of braking. It does not correspond to power, as power is proportional to torque multiplied by speed. In most cars, Braking Torque corresponds to the position of the braking pedal. For the Zoe, this is almost true. Lifting your foot from the accelerator pedal already induces a bit of Braking Torque. Pressing the braking pedal increases that torque.
The Blue Aiming Bar is the maximum braking torque the car can apply using only regeneration. Ideally, you should never brake more than the blue bar indicates: every braking beyond the Blue Aiming Bar is applied through friction braking and the corresponding energy is lost. As I explained earlier, the Blue Aiming Bar is a bit counter-intuitive: at very low speed, the motor cannot regenerate so the bar disappears. At high speed, even a little bit of torque will make the regeneration hit the maximum charging limit of the battery. When the battery is full, there is almost no regeneration at all.
For that reason, avoiding friction braking requires a bit of getting used to. It feels unnatural to “feather-brake” at speed and then apply more and more while speed bleeds off, and it certainly needs stricter anticipation.
Note: this does not apply to the Fluence and the Kangoo, as these cars only use the accelerator to control regeneration. Using the braking pedal applies friction braking only.