Rail Parking Brake Reapplication Using Acceleration Feedback
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Solution Overview
Problem
Existing rail vehicle braking systems, particularly for parking brakes, lack reliability in ensuring that a vehicle remains immobilized until a brake-release command is generated, especially in the event of unintentional movements.
Innovation Solution
A parking brake system for rail vehicles that includes a brake actuator and unit with pressing members, an electric motor, and an acceleration sensor to detect and counteract vehicle movements, ensuring the wheels remain immobile by reapplying braking force if movement thresholds are exceeded, with backup power and alarm mechanisms for notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromechanical braking systems are used for parking brake functionality, then the braking control precision and response speed are improved, but the reliability of maintaining immobilization is insufficient
Solution Approach 1:
The patent implements a feedback mechanism using an acceleration sensor that continuously monitors the rail vehicle's movement status and sends signals to the control unit. When the sensor detects unintended movement exceeding a threshold, the control unit automatically reactivates the parking brake, forming a closed-loop feedback system that ensures reliable immobilization maintenance.
Solution Approach 2:
The system employs self-service through automatic detection and correction capabilities. The acceleration sensor autonomously monitors for movement, and the control unit automatically responds by reapplying braking force without requiring manual intervention, enabling the system to self-correct immobilization failures.
2Device complexity
If the same brake units are used for different types of braking functionality, then the device complexity is reduced, but the reliability and precision of braking control deteriorates
Solution Approach 1:
The patent applies multi-functionality by designing the brake unit to serve multiple braking purposes (service braking, emergency braking, and parking braking) through a unified electromechanical structure. The control unit differentiates between braking types through software logic while using the same physical brake actuators, reducing hardware complexity while maintaining functional reliability.
3Speed
If electromechanical brakes replace pneumatically regulated brakes, then the braking response speed and control precision are improved, but the risk of malfunction due to power dependency increases
Solution Approach 1:
The system implements preliminary action by continuously monitoring power supply status and preparing backup power sources in advance. When power failure is detected, the acceleration sensor and control unit are already positioned to immediately detect movement and reactivate the parking brake using backup power, preventing malfunction rather than responding after the fact.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating backup power supply mechanisms that cushion against the harmful effect of power failures. The system prepares alternative power sources in advance to ensure the acceleration sensor and control unit remain operational during power outages, maintaining reliability despite power dependency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides highly reliable parking brake functionality by automatically maintaining wheel immobility and promptly alerting relevant entities to unintentional movements, ensuring safety and efficiency even during power outages.
Implementation Method 1
an acceleration sensor configured to register movements of the rail vehicle and produce an output signal indicative of a magnitude of the movements of the rail vehicle
Implementation Method 2
an electric motor in the brake unit configured to, act on the gear assembly in response to the electric brake-force signal so as to cause the first and second pressing members to move towards or away from the rotatable member
Implementation Method 3
A gear assembly in the brake unit is arranged to operate mechanically on the first and second pressing members
Implementation Method 4
cause the first and second pressing members to apply a braking force to the rotatable member so as to keep the at least one wheel immobile
Data Source
AI summary
A parking brake system for a rail vehicle (100) contains a brake actuator (120) for receiving a parking-brake command (cmdP) and producing an electric brake-force signal (BF). A brake unit (200) contains first and second pressing members (211, 212) and a rotatable member (110) being mechanically linked to a wheel (105) of the rail vehicle (100). When receiving the electric brake-force signal (BF), the brake unit (200) causes the first and second pressing members (211, 212) to apply a braking force to the rotatable member (110) to keep the wheel (105) immobile. A gear assembly (220) in the brake unit (200) operates mechanically on the first and second pressing members (211; 212). In response to the electric brake-force signal (BF), an electric motor (230) acts on the gear assembly (220) to cause the first and second pressing members (211; 212) to attain a specified position interrelationship. An acceleration sensor (125) registers movements of the rail vehicle (100). If movements of the rail vehicle (100) above a magnitude threshold level are registered during a period when the parking-brake command (cmdP) has instructed the at least one wheel (105) to be immobile, the brake actuator (120) reproduces the electric brake-force signal (BF) to reapply the braking force to the rotatable member (110).