Rail Car Brake Assembly With Triggered Sensor Activation
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Solution Overview
Problem
Conventional rail car brake systems for unpowered wagons face challenges with high power consumption in monitoring systems, leading to reliability issues and economic impracticality with energy harvesting components, especially during extended maintenance intervals.
Innovation Solution
A brake assembly with a sensor system that includes a trigger unit to activate sensors only during braking actions, using a pneumatic or hydraulic actuator and linkage, and incorporating a sensor device for measuring parameters like brake wear, fluid flow/pressure, and temperature, with a cost-efficient energy harvesting component or limited local power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a monitoring system with continuous sensor operation is used, then measurement precision and reliability are improved, but energy consumption increases making it unsuitable for extended maintenance intervals
Solution Approach 1:
The sensor device operates periodically rather than continuously, being activated only during braking events detected by the trigger unit. This periodic operation mode significantly reduces energy consumption while maintaining reliable monitoring capability during critical braking operations, resolving the contradiction between continuous monitoring accuracy and energy efficiency.
Solution Approach 2:
The trigger unit detects braking events in advance and activates the sensor device before actual braking occurs. This preliminary activation ensures the sensor is ready to capture brake parameter data immediately when braking starts, maintaining measurement precision without requiring continuous sensor operation.
2Duration of action of moving object
If energy harvesting components are used to power the monitoring system, then extended operation between maintenance intervals is improved, but device complexity and retrofitting costs increase
Solution Approach 1:
The system uses the existing kinetic energy from brake operations to power the monitoring system. The trigger unit leverages the mechanical movement already present during braking to activate sensors, eliminating the need for separate energy harvesting components while extending operational duration between maintenance intervals.
Solution Approach 2:
The trigger unit serves multiple functions: it detects braking events, activates the sensor device, and potentially powers the monitoring system using the mechanical energy from brake operations. This multi-functionality reduces overall system complexity while extending operational duration.
3Use of energy by moving object
If sensors are activated only during braking events, then energy consumption is reduced, but measurement precision during non-braking periods is lost
Solution Approach 1:
The trigger unit provides feedback about braking events to the sensor device, activating it only when braking is detected. This feedback mechanism ensures sensors are precisely activated during critical measurement periods (braking events) while remaining inactive during non-critical periods, maintaining measurement precision for brake wear assessment while minimizing energy consumption.
Solution Approach 2:
The sensor device dynamically changes its operational state based on braking event detection. Rather than static continuous or complete shutdown operation, the system dynamically activates sensors only during braking events, optimizing both energy consumption and measurement precision for the specific operational context.
Data Source
Figure 1~2
Figure 3~4
AI summary
A brake assembly (1) for a rail car (3) includes at least one brake element (15) for pressing against a rotor (17) of a rail car wheel (7) in case of a braking action; an actuator (13) for driving the brake element (15), a linkage (5) for transferring a braking force from the actuator (15) to the brake element, at least one sensor device (8) for measuring at least one parameter of the brake assembly (1), and the brake assembly (1) further includes a trigger unit (9) configured to enter its active state when a braking action occurs, wherein trigger unit (9) activates the sensor device (8) in the active state.