Electrohydraulic Switch Drive Pressure Monitoring for Maintenance
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Solution Overview
Problem
Current monitoring methods for mechanical systems, such as point machines, lack effective indicators for determining the state and maintenance needs of electrohydraulic switch mechanisms, particularly in assessing hydraulic pressure and its relation to operational parameters like force, resistance, and efficiency.
Innovation Solution
A monitoring method that measures hydraulic pressure in an electrohydraulic point machine, generates actual values from this pressure using proportionality factors, volume flow values, and power considerations, and evaluates these against setpoint values to determine the machine's state and necessitate maintenance, thereby using pressure as an indicator for switch force, resistance, and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hydraulic pressure is measured and used as an indicator, then the state assessment of the point machine is improved, but the device complexity increases due to additional pressure measurement requirements
Solution Approach 1:
The hydraulic pressure measurement serves multiple functions simultaneously: it indicates switch force, flow resistance, and system efficiency. This single measurement parameter provides comprehensive diagnostic information about the point machine's state, reducing the need for multiple separate sensors and measurement systems.
Solution Approach 2:
Hydraulic pressure acts as an intermediary parameter that indirectly indicates multiple system states. Instead of directly measuring force, resistance, and efficiency separately, the pressure measurement mediates the assessment of these parameters through their relationship with the hydraulic system's operating conditions.
2Reliability
If multiple actual values are generated from pressure measurements, then the monitoring comprehensiveness is improved, but the evaluation process complexity increases
Solution Approach 1:
The evaluation process is segmented into distinct calculation steps for different parameters (switch force, flow resistance, efficiency). Each parameter is evaluated separately using specific formulas based on the pressure measurement, allowing systematic and organized assessment without overwhelming complexity.
Solution Approach 2:
The system transforms the single pressure measurement parameter into multiple derived parameters (force, resistance, efficiency) through mathematical relationships. This parameter transformation allows comprehensive monitoring while maintaining a simple measurement foundation.
3Reliability
If hydraulic pressure measurement is implemented, then early detection of maintenance needs is improved, but the loss of time for implementation and setup increases
Solution Approach 1:
The pressure measurement system is integrated into the existing hydraulic switch mechanism's operational framework. The measurement infrastructure is established in advance during system setup, enabling immediate and continuous monitoring without requiring additional time for implementation during operation.
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
This method provides a comprehensive and accurate assessment of the point machine's state, enabling timely maintenance and restoring functionality by effectively utilizing hydraulic pressure as a key parameter, suppressing disturbance variables and ensuring efficient operation.
Implementation Method 1
a hydraulic pressure is measured in a pressure measurement process (12) during operation of the point machine and a pressure value is thereby determined
Data Source
Figure 1
AI summary
A monitoring method (10) for an electro-hydraulic switch drive is provided, in which, according to the invention, a hydraulic pressure is measured in a pressure measurement process (12) during operation of the switch drive, and a pressure value is thereby determined. If the pressure value or another characteristic value derived therefrom exceeds a corresponding setpoint, the need for a maintenance measure is determined. Derived characteristic values can be: switching force, hydraulic resistance, switching resistance, or pump efficiency.