Multilevel Dynamic Regenerative Braking (DRB) System

  • Applies different levels of regenerative braking with respect to the time interval between throttle release and brake pedal press.
  • Gives the driver additional assistance while the driver is still in control of the vehicle.

Abstract

The researchers at the University of Iowa have developed a novel dynamic regenerative braking system (DRB) with two different modes to assist with crash avoidance.

For Dynamic RB (DRB) mode 1, six levels of RB, all with different deceleration profiles were created. Upon accelerator pedal release, target acceleration must be greater than or equal to the acceleration of the RB level. Since mode 1 assumes the driver will press on the brake pedal, the level of RB does not change once the level is selected at accelerator release. The DRB level is reset when the driver returns their foot to the accelerator pedal in a positive manner. Previous research shows that the mean foot transfer time for service brakes (SB) is 0.44 seconds, and for a high level of Regenerative braking (RB), it is 0.758 seconds. The model is tuned to be conservative and predicts that the driver will take 1 second to transfer from the accelerator to the brake pedal
In the second mode, DRB is tuned with the expectation that the driver does not need to press on the brake pedal, unless the deceleration required exceeds the maximum deceleration offered by RB. The amount of regenerative braking applied remains dynamic throughout the braking process based on real-time calculations from sensors, until the driver applies the brake pedal. Driver input may still be required if drastic changes to the time to collision equation were to occur, or if the braking required exceeds the limits of the amount of braking RB can provide. This mode is like one pedal systems, except with the brake being used seldomly. The difference between this mode and one pedal systems is that one pedal systems apply the maximum amount of brake force when the accelerator pedal is released.

UIRF Case No. 2022-058

Website

https://uiowa.flintbox.com/technologies/2C7822C172F94139A3D6DDBCC541B4B3

Advantages

  • Applies different levels of regenerative braking with respect to the time interval between throttle release and brake pedal press.
  • Gives the driver additional assistance while the driver is still in control of the vehicle.

Contact Information

Name: Mihaela D. Bojin

Email: mihaela-bojin@uiowa.edu

Phone: 319-335-2723