Regenerative Brake Blending

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Regenerative brake blending is done by using the driver braking intent information to request a powertrain braking torque, by receiving feedback about how much powertrain torque is applied, and controlling wheel brake pressures to fulfill the braking desired along with the powertrain regenerative pressure applied. To maximize the regenerative powertrain energy recovery during braking (while still maintaining suitable brake balance), the rear brake pressures may be reduced as compared proportionally to the fronts brakes. This pressure reduction is achieved by controlling the rear isolation valves in conjunction with the pressure reducing valve, which both controlled proportionally. Feedback from a pressure transducer (regenerative axle pressure) is used for this control. The boost valve itself controls the pressure applied to the front wheel brakes during regenerative brake blending.