Shuttle Valve Pressure Testing for In-Operation Fault Detection
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Solution Overview
Problem
Existing methods for checking change valves in pneumatic systems, particularly in electronically controllable pneumatic brake systems, are complex, costly, and not economically viable for broad implementation, especially in brake systems where a majority of such valves are used.
Innovation Solution
A procedure that involves selecting a first pressure on the first change valve connection, determining an indicative value for this pressure, and comparing it to a predetermined comparative value. If the deviation is greater than a tolerance, an error in the change valve is determined and/or output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional special sensors are used to test the functionality of shuttle valves, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The shuttle valve testing method uses existing sensors and control units within the pneumatic system to perform self-diagnosis. The control unit utilizes pressure sensor data already present in the system to automatically detect shuttle valve malfunctions, eliminating the need for additional specialized sensors while maintaining testing capability
Solution Approach 2:
The existing control unit and pressure sensors are designed to serve multiple functions: normal pneumatic control and shuttle valve testing. By programming the control unit to compare sensor readings against expected values during operation, the same hardware performs both operational control and diagnostic functions, reducing overall system complexity
2Measurement precision
If additional special sensors are used to test the functionality of shuttle valves, then measurement precision is improved, but installation space and cost increase
Solution Approach 1:
The control unit is programmed to perform dual functions: normal pneumatic system control and shuttle valve diagnostic testing. By utilizing existing pressure sensors and the control unit's processing capability, the system eliminates the need for additional specialized testing sensors, thereby saving installation space while maintaining comprehensive testing functionality
3Reliability
If traditional testing methods are used for shuttle valves, then reliability is improved, but ease of operation deteriorates due to system shutdown requirements
Solution Approach 1:
The system performs continuous monitoring and comparison of pressure sensor readings during normal operation, enabling fault detection without requiring system shutdown. The control unit automatically compares actual sensor values against expected values and can identify shuttle valve malfunctions in real-time, maintaining both reliability and operational continuity
Solution Approach 2:
The diagnostic testing is integrated into the normal operational workflow, allowing the system to continuously monitor shuttle valve functionality without interruption. The control unit performs comparisons and detects faults during active operation, ensuring continuous useful action rather than requiring periodic shutdowns for testing
Data Source
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AI summary
The invention relates to a method for testing a shuttle valve (2) in a pneumatic system (100), the shuttle valve (2) having a first shuttle valve port (2.1), a second shuttle valve port (2.2) and a third shuttle valve port (2.3), wherein in each case the higher pressure of the pressures (p1, p2) applied to the first shuttle valve port (2.1) and the second shuttle valve port (2.2) is controlled at the third shuttle valve port (2.3); the method comprising the steps: a) controlling a first pressure (p1) at the first shuttle valve port (2.1); b) determining a value (G1, G1T) indicative of the first pressure (p1) at the first shuttle valve port (2. 1); and c) comparing the value (G1, G1T) indicative of the first pressure (p1) with a first predetermined comparative value (GV1, GS1) provided for this purpose, and in the event of a deviation which is greater than a first tolerance (T1): determining and/or outputting an error (E) of the shuttle valve (2).