Wheel-Level Regenerative Braking Control During ABS Events
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Solution Overview
Problem
Existing regenerative braking systems in high-performance vehicles are limited by fixed energy regeneration distribution, leading to inefficiencies and performance constraints, particularly during aggressive braking and in conditions where ABS is activated.
Innovation Solution
A control method for regenerative braking in vehicles with independent electric motors on each wheel, dynamically adjusting the distribution of electric and hydraulic braking torques based on grip factor, vertical load, and vehicle dynamics to optimize energy regeneration and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative braking is increased to maximize energy regeneration, then energy recovery is improved, but vehicle stability deteriorates due to excessive braking actions
Solution Approach 1:
The patent implements dynamic adjustment of regenerative braking distribution across four wheels based on real-time vehicle conditions including grip factor, vertical load, and deceleration rate. The system continuously modifies braking torque allocation rather than using fixed distribution, allowing optimization of energy recovery while maintaining stability thresholds. This dynamic control enables the system to adapt regenerative braking intensity to current driving conditions, preventing excessive braking that would compromise vehicle stability.
2Device complexity
If fixed division of braking between front and rear axles is used, then system simplicity is maintained, but energy regeneration potential is limited
Solution Approach 1:
The patent segments the braking control into independent wheel-level management rather than traditional axle-level fixed division. Each wheel's regenerative braking is controlled independently based on its specific grip factor and vertical load conditions. This segmentation allows the system to optimize energy regeneration from each wheel individually, capturing more total regenerative energy while maintaining manageable system complexity through modular control architecture.
Solution Approach 2:
The patent applies local quality by tailoring regenerative braking torque to each wheel's specific conditions rather than applying uniform distribution. Each wheel receives customized braking torque based on its local grip factor, vertical load, and operational state. This localized optimization ensures that wheels with better grip and load conditions contribute more to energy regeneration, maximizing overall energy recovery potential while adapting to local variations in road conditions and vehicle dynamics.
3Stability of the object's composition
If regenerative braking is disabled in ABS conditions, then vehicle control stability is maintained, but energy regeneration opportunity is lost
Solution Approach 1:
The patent implements dynamic coordination between regenerative braking and ABS systems, allowing regenerative braking to remain active during ABS events when traditionally disabled. The system continuously monitors ABS activation status and dynamically adjusts regenerative braking torque to complement rather than conflict with ABS operations. This dynamic coordination enables energy regeneration to continue during braking maneuvers that would otherwise forfeit regenerative opportunities, while ABS maintains primary control of wheel slip prevention.
Solution Approach 2:
The patent introduces a control system that acts as an intermediary between the regenerative braking system and ABS system. This intermediary controller coordinates the interaction between electric motor regenerative torque and hydraulic ABS braking, ensuring they work synergistically rather than in conflict. The intermediary manages torque distribution and timing, allowing both systems to operate simultaneously when beneficial, thereby capturing energy regeneration opportunities during ABS events while maintaining vehicle control stability through coordinated braking actions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances energy regeneration efficiency and vehicle performance by maximizing torque availability for acceleration, while maintaining stability and avoiding excessive braking actions.
Implementation Method 1
a first electric braking torque eBT delivered by each electric motor 7... so as to generate regenerative electrical energy
Implementation Method 2
a second braking torque mBT delivered by the hydraulic unit 18... exerted by the effect of friction between a brake pad placed in contact with a brake disc
Data Source
AI summary
Control method for a regenerative braking of a road vehicle driven by a driver; the road vehicle comprising four driving wheels, arranged in pairs on a front axle and/or a rear axle, each of which is rotatably driven by a respective electric motor connected to it; the method comprises the steps of: controlling a braking system, following a braking request from the driver, to actuate in regenerative electric braking, by delivering a respective first braking torque, each electric motor according to the plurality of data on vehicular dynamics and the respective maximum braking capacity values, so as to generate regenerative electrical energy; and storing the regenerative electrical energy generated by the regenerative braking of each driving wheel in a vehicular electrical energy storage system.