Adaptive Slip Control for Vehicle Braking Systems
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Solution Overview
Problem
Existing motor vehicle braking systems face challenges in predicting and preventing large control deviations during braking, which can lead to prolonged slip onset and instability due to unforeseen faults or changes in road conditions.
Innovation Solution
The method involves calculating the expected acceleration change at a vehicle wheel based on pressure changes and comparing it with the actual acceleration change, using wheel dynamics information to adjust the slip control behavior through pressure adjustments, controller amplification, frequency changes, or pulse height modifications, thereby minimizing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional slip control with predetermined thresholds is used, then the system structure remains simple, but large control deviations occur when unexpected faults happen, leading to prolonged slip onset
Solution Approach 1:
The patent implements feedback by continuously monitoring the dynamic response of wheel acceleration to pressure changes and comparing it with expected values. When deviations exceed a threshold, the system automatically adjusts control parameters to correct the deviation, creating a closed-loop control system that adapts to faults and maintains reliable braking performance.
Solution Approach 2:
The system performs preliminary detection by calculating expected acceleration changes from pressure changes before large control deviations occur. By comparing expected versus actual acceleration in advance, the system can identify emerging faults and adjust control behavior proactively, preventing prolonged slip onset rather than reacting after the problem manifests.
2Reliability
If the controller recontrols with further pressure-decrease or pressure-increase phases to reduce control deviation, then the control target can be achieved long-term, but the duration of control deviation increases
Solution Approach 1:
The feedback mechanism continuously monitors acceleration deviations and triggers timely control interventions when deviations are detected. This real-time monitoring allows the system to correct control deviations promptly rather than allowing them to persist, reducing the duration of slip onset while still achieving the control target through adaptive parameter adjustments.
Solution Approach 2:
By detecting acceleration deviations early through comparison of expected versus actual wheel dynamics, the system initiates corrective control actions before large control deviations fully develop. This preliminary detection and intervention approach shortens the duration of control deviation while maintaining the ability to achieve control targets.
3Adaptability or versatility
If the temporal behavior is determined by parameterization of the controller, then the control behavior can be adjusted, but the system cannot adapt to unexpected faults or changes in road conditions
Solution Approach 1:
The patent transforms the static parameterized controller into a dynamic adaptive system by continuously monitoring wheel acceleration responses to pressure changes. The controller automatically adjusts its behavior based on real-time comparison of expected versus actual acceleration, enabling adaptation to faults and road condition changes without requiring complex pre-programmed scenarios.
Solution Approach 2:
The control system performs self-diagnosis by comparing expected acceleration (calculated from pressure changes) with actual measured acceleration. When deviations are detected, the system automatically adjusts control parameters to correct the issue, enabling the system to adapt to faults and changing conditions autonomously without external intervention or complex external control systems.
Data Source
AI summary
The invention relates to a method for improving the control behavior of an electronic motor vehicle braking system which comprises at least a slip control function. Wheel dynamic information which is evaluated as a criterion for initiating a control intervention is used individually for each wheel and is compared with control thresholds for a pressure reduction phase, a pressure maintenance phase, and a pressure buildup phase for generating corresponding braking torques by means of a vehicle braking system. According to the invention, the expected acceleration change of a vehicle wheel is calculated from a pressure change at said wheel, said pressure change being caused by a control intervention; the actual acceleration change at the vehicle wheel, said acceleration change being caused by the pressure change, is determined from measured wheel speeds as wheel dynamic information; and the control behavior of the slip control is adapted when the actual acceleration change deviates from the expected acceleration change by a defined degree such that the deviation is minimized.