ABS Torque Reduction Based on Wheel Acceleration After Adhesion Loss
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Solution Overview
Problem
Conventional anti-lock braking systems (ABS) face challenges in efficiently managing braking torque to prevent wheel locking while maintaining a high braking effect, especially in situations with varying road friction and vehicle dynamics.
Innovation Solution
The method involves cyclically controlling braking torque by increasing it in build-up phases until a maximum adhesion is reached and then reducing it based on a calculated braking torque difference using wheel acceleration values, allowing for precise stabilization and quick re-acceleration of the wheel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the braking torque is reduced to a very low predefined value after wheel locking, then the wheel begins to rotate again in all situations, but the braking effect is excessively reduced and the stabilization time is increased
Solution Approach 1:
The invention changes the parameter of braking torque reduction from a fixed predefined value to a dynamically calculated value based on detected wheel acceleration. The control unit calculates the braking torque difference as a product of a first factor (related to wheel acceleration) and a second factor (related to vehicle speed), allowing adaptive adjustment of the torque reduction level to maintain optimal braking effect while preventing excessive reduction
Solution Approach 2:
The invention implements feedback by using the detected wheel acceleration value to determine the appropriate braking torque reduction. The system continuously monitors wheel acceleration and uses this feedback to calculate and adjust the braking torque difference, creating a closed-loop control system that adapts to actual wheel behavior rather than applying a fixed reduction schedule
2Productivity
If the braking torque is increased quickly after reduction, then a high braking effect is achieved, but the risk of excessive wheel acceleration and instability increases
Solution Approach 1:
The system uses feedback from detected wheel acceleration to control the timing and magnitude of braking torque increases. By monitoring wheel acceleration throughout the reduction phase, the system can determine when the wheel has stabilized and is ready for torque increase, preventing premature actions that would cause instability while enabling quick response when conditions are appropriate
Solution Approach 2:
The invention makes the braking torque control dynamic by continuously adjusting the torque level based on real-time wheel acceleration detection. The system transitions from static predefined torque schedules to dynamic torque adjustment, allowing the braking torque to be increased or decreased at optimal moments based on actual wheel behavior rather than fixed timing
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 a high braking effect while preventing wheel locking, with adaptive adjustments to ensure effective stabilization across varying road conditions and vehicle speeds, enhancing the robustness and efficiency of the ABS system.
Implementation Method 1
a wheel acceleration value of the wheel detected after the build-up phase
Data Source
Figure 1
AI summary
The present invention relates to a method for operating an anti-lock braking system on a vehicle, in which a braking torque (102) on at least one wheel of the vehicle is controlled cyclically at least in build-up phases (108) and reduction phases (110) to prevent locking of the wheel, wherein the braking torque (102) is increased in a build-up phase (108) until a maximum adhesion at the wheel is exceeded and the braking torque (102) is reduced in a subsequent reduction phase (110) by a braking torque difference (112), which is determined using a wheel acceleration value (114) for the wheel captured after the build-up phase (108) and a target acceleration value (116) for the wheel.