System and method for controlling regenerative braking in a vehicle

摘要

A vehicle and a method for controlling regenerative braking may utilize the maximum available regenerative braking torque for some time during a braking event. As the vehicle speed and/or powertrain torque decreases, the regenerative braking torque is controlled to deviate from the maximum. The point at which the regenerative braking torque deviates from the maximum is chosen based on the level of vehicle deceleration. The regenerative braking torque is then smoothly blended out until it reaches zero. The regenerative braking torque is brought to zero when the vehicle speed is very low, thereby eliminating the inefficiencies associated with operating a motor at a very low speed.

主权项

1. A method for controlling regenerative braking in a vehicle, comprising:
reducing regenerative braking to zero starting at a first vehicle speed when an amount of brake energy dissipated is greater than a brake energy limit; and reducing regenerative braking to zero starting at a second vehicle speed greater than the first vehicle speed when the amount of brake energy dissipated is not greater than the brake energy limit.