Automated Parking Brake Verification Using Vehicle Motion Monitoring
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Solution Overview
Problem
Existing automated parking systems rely on software to determine the sufficiency of the parking brake's clamping force, which is prone to errors due to undetected faults, leading to potential vehicle instability during parking maneuvers.
Innovation Solution
Implement a vehicle monitoring system to independently verify the vehicle's stationary state using wheel speed sensors and electromechanical parking brakes, with redundant control paths to ensure secure holding, including hydraulic service brakes and steering systems, and issue warnings if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If software control is used to determine parking brake clamping force sufficiency, then automation is improved, but reliability deteriorates due to undetected faults and measurement corruption
Solution Approach 1:
A separate monitoring device is introduced as an intermediary between the parking brake actuator and the control system. This monitoring device independently measures wheel speeds and determines whether the vehicle is securely held, providing a separate verification path that does not rely on the potentially faulty software control system.
Solution Approach 2:
The monitoring device continuously monitors wheel speeds and provides feedback about the vehicle's holding status. When movement is detected indicating insufficient clamping force, the system triggers an alarm and can activate the service brake to correct the situation, creating a closed-loop feedback system that improves reliability.
2Reliability
If redundant control paths are implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into functionally independent components: the parking brake control unit, the monitoring device with wheel speed sensors, the service brake system, and the alarm system. Each component performs a specific function and can operate independently, reducing the propagation of faults while maintaining manageable complexity through functional separation.
Data Source
AI summary
A method for automated parking of a vehicle by means of a parking assistance system, comprises the parking assistance system requesting activation of a holding device in order to hold the vehicle stationary. For safety reasons, a vehicle monitoring system monitors a movement of the vehicle and, based on the movement established, decides whether the vehicle has been successfully held by means of the holding device, the vehicle being secured independently of the holding device and/or a warning signal being output if holding is not successful.