Hydraulic Accumulator Pre-Charge Detection by Controlled Flow Timing
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Solution Overview
Problem
Conventional methods for detecting the pre-charge in hydraulic accumulators are limited by reliability and repeatability, necessitating improved techniques for assessing accumulator health and maintenance needs.
Innovation Solution
A method involving controlled flowrate charging of hydraulic fluid into or out of an accumulator cavity, measuring idle time until machine component movement is detected, and determining pre-charge based on the flowrate value, allowing for accurate assessment of accumulator status without the need for pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pressure sensing methods are used to detect accumulator pre-charge, then the measurement can be obtained directly, but the reliability and repeatability of the measurement deteriorates
Solution Approach 1:
The patent replaces conventional pressure sensing methods with a flow-based measurement approach. By measuring flow rate through the accumulator and timing how long it takes for pressure to build up, the system determines pre-charge levels without relying on direct pressure sensors. This substitution of measurement methodology improves both reliability and repeatability by using more stable and controllable flow measurements rather than direct pressure detection.
Solution Approach 2:
The patent introduces flow rate measurement as an intermediary parameter to indirectly determine pre-charge levels. Instead of directly measuring pressure, the system measures the flow of hydraulic fluid through the accumulator and uses timing data to calculate pre-charge. This intermediary measurement approach provides more reliable and repeatable results by avoiding the limitations of direct pressure sensing methods.
2Measurement precision
If direct pressure measurement is used, then the pre-charge value can be obtained immediately, but the method complexity increases due to sensor requirements
Solution Approach 1:
The patent eliminates the need for complex pressure sensing systems by substituting them with flow rate measurement devices and timing mechanisms. The system uses a flow controller to regulate hydraulic fluid flow through the accumulator and a timer to measure the duration until pressure build-up occurs. This substitution reduces device complexity while maintaining or improving measurement accuracy.
Solution Approach 2:
The system uses the accumulator's own pressure build-up process as the measurement mechanism. By controlling flow into the accumulator and timing how long it takes for the pressure to rise, the system determines pre-charge levels using the accumulator's inherent characteristics rather than requiring external sensing infrastructure. This self-service approach simplifies the overall detection system.
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 approach provides a reliable and repeatable method for determining accumulator pre-charge, enabling timely maintenance and improving the accuracy of accumulator health assessments.
Implementation Method 1
charging hydraulic fluid into or out of a cavity of an accumulator at a controlled flowrate
Implementation Method 2
The idle time can be utilized to hold the machine component in the first position
Data Source
AI summary
An exemplary method generally includes charging hydraulic fluid into or out of a cavity of an accumulator at a controlled flowrate, detecting movement of a machine component from a first position toward a second position, determining an idle time spanning from a start of the charging to detection of the movement of the machine component, and determining a pre-charge of the accumulator based upon the idle time and a flowrate value of the controlled flowrate.