Vehicle Acceleration Monitoring for Unknown Braking Force Detection
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Solution Overview
Problem
Existing spring-loaded brake systems in vehicles, particularly rail vehicles, can fail to release due to actuation system failures like leaks, leading to unintended brake application and potential vehicle damage, as current monitoring methods rely on feedback from the braking system and may not detect unknown braking forces effectively.
Innovation Solution
A method that uses vehicle control systems to detect the position of drive power control elements, calculate and compare acceleration values, and infer unknown braking forces by determining deviations from specified values, providing a signal to the driver without requiring additional hardware or sensors, thus actively monitoring driving behavior independently of brake system feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake system feedback monitoring is used to detect applied brakes, then the system can identify brake status, but it may fail to detect unknown braking forces caused by actuation system failures
Solution Approach 1:
The patent introduces an intermediary monitoring system that uses acceleration sensors and drive power analysis as a mediator between the brake system and the control unit. This intermediary layer detects deviations between commanded and actual acceleration, enabling detection of unknown braking forces that the direct brake feedback system misses.
Solution Approach 2:
The patent implements a feedback mechanism where the control unit continuously compares the commanded acceleration (from drive power control element position) with the actual acceleration (from acceleration sensor). This closed-loop feedback enables detection of discrepancies indicating applied brakes, even when the brake system's own feedback is unreliable.
2Measurement precision
If additional sensors are added to detect braking forces, then detection accuracy improves, but device complexity and cost increase
Solution Approach 1:
The patent makes existing components serve multiple functions: the acceleration sensor originally intended for other purposes is also used for brake detection, and the drive power control element position sensor serves both drive control and brake monitoring functions. This multi-functionality improves detection accuracy without adding dedicated brake sensors.
Solution Approach 2:
The system uses its own existing sensors and control elements to monitor brake status. The acceleration sensor, drive power sensor, and control unit that already exist in the vehicle are leveraged for brake detection, eliminating the need for additional dedicated brake monitoring hardware.
3Reliability
If the brake system is designed as fail-safe with spring-loaded brakes, then safety is improved, but unintended brake application due to actuation failures becomes more likely
Solution Approach 1:
The patent implements preliminary detection and warning before damage occurs. The control unit continuously monitors for deviations between commanded and actual acceleration, providing early warning of unintended brake application through driver alerts, enabling corrective action before serious vehicle damage occurs.
Solution Approach 2:
The patent implements continuous feedback monitoring that compares intended acceleration (from drive control) with actual acceleration (from sensors). This feedback loop provides real-time detection of unintended brake application in fail-safe brake systems, enabling timely driver intervention to prevent damage.
Data Source
AI summary
The invention relates to a method and to a vehicle having a vehicle controller for carrying out the method with the following method steps: - sensing a position of a control element for regulating the drive power, - predefining an acceleration value in accordance with the sensed position of the control element for regulating the drive power, - sensing an instantaneous acceleration value of the vehicle; - comparing the sensed acceleration value with the predefined acceleration value, - inferring there is an unknown braking force when a deviation of the sensed acceleration value from the predefined acceleration value by at least a predefined amount is detected, - outputting a signal about an unknown braking force to the driver of the vehicle.