Valve Manifold Cycle-Time Monitoring for Pneumatic Actuator Faults
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Solution Overview
Problem
Current valve manifold control systems in industrial settings lack comprehensive monitoring capabilities, particularly for the performance response time of piston and cylinder assemblies, which can lead to unscheduled line stoppages due to limited monitoring of control valves and downstream issues like tubing problems and wear.
Innovation Solution
A field bus solenoid valve assembly with an electronic communication module, position sensors, a timer, storage device, comparator, and alarm system that measures and compares the elapsed time of piston and cylinder cycles to predetermined tolerance boundaries, providing direct warnings for any deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If monitoring is limited to only the control valve, then the monitoring system is simple, but it does not provide information about problems downstream in the pneumatic tubing or within the field device
Solution Approach 1:
The patent implements feedback by measuring the actual cycle time of the field device and comparing it against expected parameters. The timing circuit receives signals from the field device's position sensors and generates feedback about the device's operational status, enabling detection of downstream problems such as tubing issues or device wear without adding complex monitoring infrastructure.
Solution Approach 2:
The field device itself provides monitoring information through its existing position sensors and cycle operation. The timing circuit utilizes signals already present in the control system to self-diagnose performance issues, eliminating the need for separate downstream monitoring equipment while still capturing comprehensive system health data.
2Ease of operation
If the PLC sends indicator signals through the main control unit to the I/O unit, then the control architecture is maintained, but the warning system is unnecessarily complicated and not expeditious
Solution Approach 1:
The patent extracts the timing and warning function from the complex PLC-main control unit-I/O unit signal path and implements it directly at the field device level through a dedicated timing circuit. This extraction creates a standalone monitoring system that operates independently of the main control architecture, providing expeditious local warnings without requiring signals to traverse the entire control hierarchy.
Solution Approach 2:
The timing circuit acts as an intermediary device that directly interfaces between the field device's position sensors and the warning system. It mediates the monitoring function by processing timing signals locally and generating warnings without requiring communication through the PLC or main control unit, thereby simplifying the warning transmission path while maintaining control architecture integrity.
Data Source
AI summary
A field bus solenoid valve assembly has a sensor for detecting the commencement of an actuation cycle for moving a piston in a cylinder and piston assembly. A position sensor detects an end position of a piston in a cylinder and piston assembly at the end of the actuation cycle. A timer times the elapsed time between the initiation of the actuation cycle of the piston and when the position sensor for detecting an end position detects the piston in its end position at the end of the actuation cycle. A comparator operably connected to a storage device and the sensors for comparing elapsed time from the sensors to a normalized time or profile and a predetermined tolerance boundary in the storage device. An alarm device is actuated if the elapsed time is outside of the set tolerance boundary.