Rail Vehicle Derailment Detection via Torque Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for detecting a derailed rail vehicle condition, especially at low speeds, are not reliable and early enough, particularly for autonomously driving or automated rail vehicles.
Innovation Solution
A method and device that limit the drive torque to a predetermined value based on vehicle speed and position, generating a derailment signal if the speed falls below a threshold, with the ability to adapt to different positions and speeds, ensuring early detection of a derailed condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing derailment detection methods are used, then detection capability is provided, but detection reliability at low speeds is insufficient
Solution Approach 1:
The system performs preliminary actions by limiting the drive torque to a maximum value before derailment can occur at low speeds. This preventive torque limitation creates controlled test conditions that enable early detection of derailment states before they develop into dangerous situations.
Solution Approach 2:
The invention changes the drive torque parameter by limiting it to a predetermined maximum value during detection phases. This parameter modification enables the system to operate in a controlled manner that makes derailment detection possible at low speeds where traditional methods fail.
2Reliability
If drive torque is limited to enable low-speed detection, then detection capability improves, but vehicle productivity decreases
Solution Approach 1:
The system dynamically adjusts the drive torque limitation based on operational context. The control device can modify the maximum torque value or deactivate the limitation when high-speed operation is required, allowing the system to adapt between detection mode (low speed, torque limited) and normal operation mode (high speed, full power) to balance safety and productivity.
Solution Approach 2:
The derailment detection using torque limitation is performed periodically or at specific intervals rather than continuously. The system alternates between detection phases where torque is limited and normal operation phases where full power is available, enabling reliable low-speed detection while maintaining overall vehicle productivity.
3Measurement precision
If position-dependent torque limitation is implemented, then detection precision improves, but device complexity increases
Solution Approach 1:
The control device performs multiple functions: it limits drive torque to a maximum value, determines vehicle position, compares position with stored reference positions, and controls the drive machine. By consolidating these functions in a single multi-functional control unit, the system achieves position-dependent torque limitation without proportionally increasing overall device complexity.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a method for detecting a derailed state of a rail vehicle (1) comprising: - limiting a drive torque generated by a drive motor (2) of the rail vehicle (1) to a maximum value (AM_max), - determining a vehicle speed (v), - detecting the derailed state if the vehicle speed (v) is less than a speed threshold (v_th), as well as a device (6) and a rail vehicle (1).