Brake Valve Fault Detection Using Pressure and Flow Comparison
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Solution Overview
Problem
Braking devices for processing machines face challenges in detecting malfunctions of valves, which can impair braking functionality due to limited valve responsiveness, leakage, or improper pressure conduction, necessitating a method for quick and precise detection of valve malfunctions.
Innovation Solution
A method involving the triggering of valves to establish connections, measuring state variables such as pressure or mass flow, comparing these to reference variables, and outputting fault signals to detect malfunctions, which can be implemented in both single and redundant valve configurations, using sensors and control devices to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If valve responsiveness is improved to detect malfunctions quickly, then detection speed increases, but device complexity increases due to additional sensors and measurement systems
Solution Approach 1:
The valve is triggered to open and close automatically as part of normal braking operations, and the control device simultaneously measures state variables during these triggered states to detect malfunctions. The system uses existing operational cycles for self-diagnosis without requiring separate test mechanisms, thereby achieving fast detection without proportionally increasing device complexity.
Solution Approach 2:
The control device continuously monitors state variables (pressure, mass flow) in the transmission portion and compares them against expected values during triggered valve states. This feedback mechanism enables real-time malfunction detection by identifying deviations from normal operation, achieving rapid detection while utilizing existing control infrastructure.
2Measurement precision
If measurement precision is improved to accurately detect valve malfunctions, then detection accuracy increases, but device complexity increases due to sophisticated sensors and reference systems
Solution Approach 1:
The system replaces complex mechanical malfunction detection mechanisms with electronic sensing and control. State variables such as pressure and mass flow are measured using sensors that provide precise electrical signals to the control device, which processes this data to detect malfunctions. This substitution achieves high measurement precision while reducing mechanical complexity.
Solution Approach 2:
The control device serves multiple functions: it controls the triggering of the valve, measures state variables, compares measurements against reference values, and detects malfunctions. By consolidating these functions into a single control device rather than separate specialized components, the system achieves precise malfunction detection without proportionally increasing device complexity.
Data Source
AI summary
A method is provided for detecting a malfunction of a valve (46) of a braking device (10) for a processing machine, where the braking device (10) has a brake that can be actuated via the valve (46) and a transmission portion (22). The method includes triggering (I.1) the valve (46) of the braking device (10) and determining a state variable in the transmission portion (22). The method further comprises a comparison (III.1) of the determined state variable to a reference variable and a detection (IV.1) of a malfunction of the valve (46) based on a result of the comparison.