Regenerative Brake Control for ABS Wheel-Lock Prevention
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Solution Overview
Problem
Existing vehicle braking systems with electric drives configured for regenerative braking often release the electric drive prematurely during ABS control, leading to wasted recuperation potential and reduced active slip adjustment capabilities.
Innovation Solution
A method of control that captures selection information to ascertain dynamic trigger thresholds and slip-control methods, allowing the electric drive to continue contributing to braking and energy recuperation by adjusting the braking torque based on real-time conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed ABS trigger thresholds are used for detecting wheel-locking tendency, then the ABS control can be implemented with pneumatic braking system, but the electric drive is released prematurely and recuperation potential is wasted
Solution Approach 1:
The patent applies dynamics by transitioning from fixed ABS trigger thresholds to dynamic thresholds that adapt in real-time based on the actual braking situation. The control unit continuously adjusts the trigger thresholds depending on whether friction braking, regenerative braking, or combined braking is active, allowing the electric drive to remain engaged longer and maximize recuperation while maintaining ABS reliability.
Solution Approach 2:
The patent changes the parameter of trigger thresholds from static fixed values to dynamic values that vary according to braking mode. By modifying the threshold parameters based on real-time conditions (friction brake activation, regenerative brake availability, wheel slip detection), the system optimizes both ABS performance and energy recuperation.
2Stability of the object's composition
If the electric drive is released during ABS control to prevent wheel-locking, then wheel stability is maintained, but the electric drive cannot actively participate in braking and slip adjustment
Solution Approach 1:
The patent merges the ABS control function with the electric drive control function. Instead of releasing the electric drive during ABS events, the system combines both braking systems work together, with the control unit coordinating friction brake application and electric drive torque reduction to achieve wheel stability while maintaining active slip adjustment capability through the electric drive.
Solution Approach 2:
The control unit performs multiple functions simultaneously: it manages ABS wheel-locking prevention, maintains electric drive engagement for slip adjustment, and optimizes energy recuperation. This multi-functionality allows the system to achieve wheel stability while the electric drive continues to actively participate in braking control.
3Reliability
If conservative ABS control thresholds are applied, then wheel-locking is prevented, but the electric drive is deactivated and cannot contribute to braking torque
Solution Approach 1:
The system dynamically adjusts the trigger thresholds based on braking mode rather than using conservative fixed values. When regenerative braking is available, the thresholds are adjusted to allow the electric drive to contribute more braking torque before ABS intervention is triggered, enabling both reliable wheel-locking prevention and maximum electric drive participation in braking.
Solution Approach 2:
The patent creates a composite braking system where friction braking and regenerative braking work together. The control unit coordinates both systems, allowing the electric drive to provide braking torque alongside friction brakes, with the combined effect achieving reliable wheel-locking prevention while maximizing total braking force contribution from both systems.
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
This approach enables the electric drive to actively participate in braking, maintain driving stability, and enhance energy recuperation by dynamically adjusting the braking torque according to changing driving conditions.
Implementation Method 1
the electric drive having been configured for regenerative braking
Implementation Method 2
a friction-brake device
Data Source
AI summary
A method is for controlling a vehicle, in particular a commercial vehicle, having an electric drive, which has been configured for regenerative braking, and a friction-brake device. The method includes: capturing selection information; ascertaining a set of trigger thresholds and a slip-control method on the basis of the selection information, wherein the set of trigger thresholds includes one or more threshold-value conditions defined for the purpose of detecting the wheel-locking tendency; detecting a wheel-locking tendency on the basis of the one or more threshold-value conditions; and instigating a control of the electric drive and/or of the friction-brake device on the basis of the slip-control method and the set of trigger thresholds when the wheel-locking tendency has been detected.