Active rear steering power consumption management

A system for power management in an active rear steering system in a vehicle comprising:

• a vehicle configured with an active rear steering system;
• the active rear steering system including a rack motor configured to effectuate an angle of rear wheel steering;
• a controller configured to generate control commands to the active rear steering system based on a state of charge of a vehicle battery derived from a voltage level of the vehicle battery;
• the controller further configured to enable a full performance level of the active rear steering system when the voltage level of the vehicle battery is greater than a first threshold level;
• the controller further configured to degrade the full performance level of the active rear steering system to a reduced performance level of the active rear steering system when the voltage level of the vehicle battery is less than the first threshold level but greater than a second threshold level;
• and
• the controller further configured to disable the performance level of the active rear steering system when the voltage level of the vehicle battery is less than the second threshold level.

A method for power management in an active rear steering system in a vehicle comprising:

• determining a state of charge of a vehicle battery based on a voltage level of the vehicle battery;
• enabling a full performance level of the active rear steering system when the voltage level of the vehicle battery is greater than a first threshold level;
• degrading the full performance level of the active rear steering system to a reduced performance level of the active rear steering system when the voltage level of the vehicle battery is less than the first threshold level but greater than a second threshold level;
• and
• disabling the performance level of the active rear steering system when the voltage level of the vehicle battery is less than the second threshold level;
• and
• determining a voltage level of the vehicle battery, a voltage gradient level of the vehicle battery, and a rear rack force of the active rear steering system to determine a level of the reduced performance level of the active rear steering system;
• wherein the reduced performance level of the active rear steering system is determined by an output performance level of the active rear steering system that includes a jerk component level, an acceleration component level, a velocity component level, and a rear rack displacement component level,
• wherein when the voltage level of the vehicle battery is less than the first threshold level, and the voltage gradient is decreasing, and the rear rack force is less than a first rear rack force threshold level, then the jerk component level is reduced,
• wherein when the voltage level of the vehicle battery is less than the first threshold level, and the voltage gradient is decreasing, and the rear rack force is greater than a second rear rack force threshold level but less than a third rear rack force threshold level, then the jerk component level is reduced and the acceleration component level is reduced,
• wherein when the voltage level of the vehicle battery is less than the first threshold level, and the voltage gradient is decreasing, and the rear rack force is greater than a third rear rack force threshold level, then the jerk component level is reduced and the acceleration component level is reduced and the velocity component level is reduced and the displacement component level is reduced,
• wherein when the voltage level of the vehicle battery is less than the second threshold level, then the jerk component level is set to zero and the acceleration component level is set to zero and the velocity component level is set to zero and the displacement component level is set to zero, and
• wherein the degrading the full performance level of the active rear steering system to the reduced performance level comprises utilizing a controller to limit commands to output an S-curve motion profile to a rear steering motor.