Parking Brake Actuator Damage Detection via Torque Profile Analysis
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Solution Overview
Problem
Existing methods for checking the operation of automated brake devices, particularly electrohydraulic parking brakes, fail to timely detect damage independently of stored target values, leading to potential failure and incorrect damage assessments.
Innovation Solution
A method that identifies damage in automated parking brakes by analyzing the time profile of the output torque of the parking brake actuator, focusing on current value changes and voltage profiles to detect anomalies and classify damage, avoiding false interpretations through defined conditions and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damage detection is based on stored target values or target value characteristics, then damage can be identified, but the detection may be incorrect or unreliable
Solution Approach 1:
The patent stores reference current profiles and torque characteristics during a calibration phase before actual damage detection. These pre-stored reference values serve as baseline data for comparing against current operational measurements, enabling reliable damage detection without requiring complex real-time target value storage during operation.
Solution Approach 2:
The system continuously monitors the actual current profile and torque output of the parking brake actuator, compares these measurements against the stored reference profiles, and provides feedback when deviations indicate damage. This feedback mechanism enables ongoing reliability verification while maintaining measurement precision through systematic comparison.
2Reliability
If the parking brake is checked continuously for damage, then damage can be detected timely, but the complexity of the monitoring system increases
Solution Approach 1:
The parking brake system performs self-diagnosis by monitoring its own current profile and torque output during normal operation. The control unit analyzes the actuator's performance characteristics without requiring external monitoring equipment, enabling timely damage detection while minimizing additional system complexity.
Solution Approach 2:
The control unit serves multiple functions: it controls the parking brake actuator operation, monitors the current profile, measures torque output, stores reference data, and performs damage detection analysis. This multi-functionality reduces the need for separate dedicated monitoring components, thereby limiting the increase in system complexity.
3Measurement precision
If damage detection is performed independently without stored target values, then false damage messages are avoided, but the ability to detect damage timely is reduced
Solution Approach 1:
The patent replaces complex mechanical reference standards with electrical current profile analysis. Instead of requiring physical target value storage or mechanical comparison standards, the system uses electrical measurements (current, torque) that can be digitally processed and compared against stored reference profiles, achieving both independence from physical targets and timely detection capability.
Solution Approach 2:
The system monitors changes in operational parameters (current profile shape, torque magnitude, response time) of the parking brake actuator. By detecting deviations in these parameters from stored reference profiles, the system achieves timely damage identification while maintaining detection validity through parameter-based rather than absolute target value-based comparison.
Data Source
AI summary
A method for determining defects of an automated parking brake for a motor vehicle with at least one brake device includes detecting damage to the parking brake on the basis of a time profile of a variable representing an output torque of a parking brake actuator. The parking brake includes the parking brake actuator configured to be activated. The detection of the damage includes analyzing the time profile of the variable representing the output torque of the parking brake actuator during a first phase of an activation process of the parking brake for the identification. The activation process of the parking brake has at least two phases. A first phase of the activation process includes a no build up or reduction of a clamping force between at least one brake lining and a brake disk. A second phase includes a build up or reduction of the clamping force.