Hydraulic Failure Detection Using Supply and Case Drain Pressure
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Solution Overview
Problem
Conventional failure detection systems for hydraulic systems can only detect faults in hydraulic pumps and not in the associated hydraulic systems, requiring complex measuring apparatuses and temperature sensors, and fail to differentiate between pump and system failures.
Innovation Solution
A failure detection apparatus using two pressure sensors in the supply and case drain lines, with software algorithms to monitor pressure values and determine deviations from a reference curve, allowing for real-time detection of faults in both hydraulic pumps and system components, reducing the need for additional sensors and providing a robust health monitoring system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional failure detection apparatuses use dependencies between parameters of different types and complicated measuring apparatuses, then they can detect pump failures, but they cannot detect faults in the associated hydraulic system and require overly complicated measuring apparatuses
Solution Approach 1:
The invention segments the hydraulic system into two distinct monitoring zones: the supply line (upstream of the pump) and the case drain line (downstream of the pump). By placing pressure sensors in these specific locations, the system can independently monitor pressure conditions in each zone, enabling differentiation between pump failures and system component failures without requiring complex multi-parameter measurement apparatuses.
Solution Approach 2:
The pressure sensors in the supply and case drain lines serve multiple functions: they monitor system pressure, detect pump failures, detect system component failures, and provide data for health identifier calculation. This multi-functionality eliminates the need for separate specialized sensors for different failure modes, reducing overall apparatus complexity while maintaining comprehensive fault detection capability.
2Reliability
If conventional methods use multiple sensors and complex algorithms to monitor hydraulic systems, then they can provide comprehensive monitoring, but they increase system complexity and cost
Solution Approach 1:
The invention extracts and utilizes existing pressure sensors that are already installed in the hydraulic system for their primary pressure monitoring function. By repurposing these sensors to also detect failures through the described methodology, the system achieves comprehensive health monitoring without adding specialized failure detection sensors, thereby avoiding increased system complexity.
Solution Approach 2:
The invention merges the functions of pressure monitoring and failure detection into a unified system using the same pressure sensors. The control unit processes pressure data from both sensors to generate health identifiers and detect various failure modes, combining multiple monitoring functions into a single integrated system rather than using separate dedicated systems for each function.
3Loss of information
If conventional failure detection systems differentiate between pump and system failures, then they can provide precise fault diagnosis, but they require complex measuring apparatuses and temperature sensors
Solution Approach 1:
The invention adds a spatial dimension to failure detection by monitoring pressure in two distinct locations (supply line and case drain line) rather than relying on temporal analysis of single-point pressure data. This spatial differentiation enables the system to distinguish between pump failures and system component failures based on the pattern of pressure deviations across the two measurement points, achieving precise fault diagnosis without additional sensor types.
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
Enables reliable and efficient detection of faults in hydraulic pumps and system components, improving safety and economic efficiency by reducing the complexity of the monitoring system and eliminating the need for temperature sensors in most cases, while allowing for both real-time and post-processing applications.
Implementation Method 1
a first pressure sensor that senses a first pressure value of the hydraulic fluid in the supply line
Implementation Method 2
a second pressure sensor that senses a second pressure value of the hydraulic fluid in the case drain line
Data Source
AI summary
A failure detection apparatus for a hydraulic system, to a hydraulic, failure detection-capable system, and to a method of operating a failure detection apparatus. The failure detection apparatus comprises a monitoring and failure detection unit that receives first and second pressure values from first and second pressure sensors and comprises a failure detection unit that detects a failure of at least one hydraulically operated device when a 2-tuple of a plurality of 2-tuples is within a first and outside a second predetermined tolerance range of relative pressure values, and wherein the failure detection unit 260 detects a failure of the pump when a 2-tuple of the plurality of 2-tuples is outside the first predetermined tolerance range of relative pressure values.