Parking Brake Movement Detection Differentiating Rolling from Shaking
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Solution Overview
Problem
Existing methods for retensioning a vehicle's parking brake in a parked state often misinterpret small shaking movements as rolling movements, leading to unnecessary increased brake tension, which can be damaging and inefficient.
Innovation Solution
A method that differentiates between rolling and shaking movements by analyzing the movement travel and direction using wheel rotational speed sensors, integrating movement variables over a consideration time period and comparing rotational speed pulses from multiple wheels to determine if the movement meets predetermined conditions, thereby adjusting brake tension accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake is retensioned based on monitoring any movement of the parked vehicle, then the application force can be ensured to be sufficiently high for the stationary state, but small shaking movements (e.g., when entering/exiting the vehicle) are misinterpreted as rolling movements, leading to undesirably excessively high brake application force
Solution Approach 1:
The system dynamically adjusts the evaluation criteria for movement detection by integrating movement variables over time and comparing the integrated value against a threshold. This dynamic approach allows the system to distinguish between transient shaking movements (which integrate to small values) and sustained rolling movements (which integrate to larger values), thereby preventing unnecessary brake retensioning while maintaining reliable detection of actual rolling.
Solution Approach 2:
The system changes the parameter of movement evaluation from instantaneous movement detection to integrated movement detection over a consideration time period. By integrating the movement variable with respect to movement travel and comparing against a predetermined condition, the system transforms the detection parameter to filter out high-frequency shaking movements while capturing low-frequency rolling movements, thus reducing mechanical stress on the brake.
2Stability of the object's composition
If increased retensioning of the parking brake is applied to prevent rolling, then the vehicle stationary state is better maintained, but the brake application force becomes excessively high even for small shaking movements, causing unnecessary mechanical stress
Solution Approach 1:
The system uses feedback from wheel rotational speed sensors to continuously monitor vehicle movement and integrates this information over time. The integrated movement value is compared against a threshold to determine whether actual rolling has occurred. This feedback mechanism allows the system to apply brake retensioning only when necessary (when rolling is detected), rather than maintaining continuously high brake application force, thus reducing unnecessary mechanical stress while preserving vehicle stability.
3Measurement precision
If the movement detection threshold is set low to detect small shaking movements, then movement detection sensitivity is improved, but shaking movements are misclassified as rolling movements, leading to false brake retensioning
Solution Approach 1:
The system performs preliminary integration of the movement variable over a consideration time period before making a classification decision. This preliminary action accumulates movement information, allowing the system to distinguish between transient shaking (which accumulates to small integrated values) and sustained rolling (which accumulates to larger integrated values). By setting the threshold on the integrated value rather than instantaneous movement, the system maintains high detection sensitivity while avoiding false classification of shaking as rolling.
Data Source
AI summary
A method for detecting a movement of a vehicle that has been shut down in a parked state, including: detecting a movement variable which describes a movement of the vehicle, integrating the movement variable, in a manner dependent on a movement direction of the vehicle, to obtain a movement travel, and, if the movement travel meets a predetermined condition, making a decision on the movement for detection.