Fluid Pressure Actuator Motion Detection Using Summed Chamber Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for detecting the operations of fluid pressure actuators struggle to accurately determine the start and stop times of piston movement due to inconsistent variations in pressure differential values, making it difficult to differentiate between piston start/stop and direction changes.
Innovation Solution
A system that includes first and second pressure detecting units to monitor pressure values in respective chambers, and a detection program that calculates an addition value of these pressures, time-differentiates this value, and detects start and stop times based on variations in the time differential value, regardless of piston direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the time differential value of the first pressure value is monitored to detect piston start and stop times, then the detection system can identify pressure changes, but it cannot accurately determine whether the piston has started or stopped moving because the value always varies in a positive direction
Solution Approach 1:
The patent combines the first pressure value and second pressure value into a single composite parameter (their sum) before calculating the time differential. This merging allows the system to detect both piston start and stop events through a unified detection metric, resolving the ambiguity of whether the piston is starting or stopping when the differential value changes direction.
Solution Approach 2:
Instead of monitoring the time differential value of individual pressure values separately (which always varies in one direction), the patent inverts the approach by monitoring the time differential of the sum of both pressure values. This inversion causes the differential to vary in both positive and negative directions, enabling accurate detection of piston movement state changes.
2Measurement precision
If the time differential value of the second pressure value is monitored to detect piston start and stop times, then the detection system can identify pressure changes, but it cannot accurately determine whether the piston has started or stopped moving because the value always varies in a negative direction
Solution Approach 1:
The patent merges the first pressure value and second pressure value into a single composite parameter (their sum) before calculating the time differential. This combining approach allows the system to detect both piston start and stop events through a unified detection metric, eliminating the directional limitation of monitoring individual chamber pressures separately.
3Quantity of substance
If separate pressure monitoring of first and second pressure acting chambers is performed, then pressure values in each chamber can be obtained, but the system complexity increases and accurate detection of piston movement events becomes difficult
Solution Approach 1:
The patent combines the detection logic for both pressure chambers into a single unified parameter (the sum of first and second pressure values). This reduces system complexity by using one detection metric instead of two separate monitoring systems, while still providing complete information about piston movement events in both chambers.
Data Source
AI summary
An operation detecting system for a fluid pressure actuator is provided with a first pressure sensor for detecting a first pressure value which is a pressure value in a first pressure acting chamber, a second pressure value which is pressure value in a second pressure acting chamber, and an operation detecting device including a detection program configured to calculate an addition value of the first pressure value and the second pressure value, calculate a time differential value of the addition value, and detect the start time and the stop time of movement of a piston based on a variation in the time differential value over time.