Fluid State Sensor Correction for High-Conductivity Hydraulic Oil
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Solution Overview
Problem
Existing fluid state detection sensors face challenges in maintaining accurate conductivity detection, particularly for hydraulic oils with conductivities above a certain threshold, leading to reduced measurement precision.
Innovation Solution
The sensor incorporates a conductivity acquisition unit, a correction value memory, and a corrector to adjust conductivity measurements using stored correction values when the conductivity exceeds a predetermined threshold, and in a second embodiment, a correction value estimator uses a database to estimate correction values based on hydraulic oil information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage is applied to electrodes to measure conductivity using conventional circuits, then the sensor can detect hydraulic oil state, but the detection accuracy of conductivity deteriorates when conductivity exceeds a predetermined value
Solution Approach 1:
The patent changes the electrical parameters of the measurement circuit by switching between conductivity measurement mode and relative permittivity measurement mode. When conductivity exceeds the predetermined value, the system switches to measuring relative permittivity instead, thereby avoiding inaccurate conductivity measurements while maintaining reliable detection capability.
Solution Approach 2:
The patent introduces a microcontroller unit as an intermediary that controls the switching between measurement modes and processes the measurement data. This intermediary coordinates the electrode connections to the conductivity measurement circuit or relative permittivity measurement circuit based on the detected conductivity value, ensuring accurate measurements across different oil types.
2Measurement precision
If the connection destination of the electrode is switched to obtain conductivity or relative permittivity, then measurement accuracy can be improved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the same electrode pair to serve dual purposes: measuring both conductivity and relative permittivity. The microcontroller unit controls the switching of electrode connections to appropriate measurement circuits, allowing a single sensor design to perform multiple measurement functions without requiring separate sensors for each parameter.
Solution Approach 2:
The patent introduces dynamic switching capability where the electrode connection configuration changes based on the measurement requirements. The system can dynamically reconfigure the electrode connections between conductivity measurement mode and relative permittivity measurement mode, allowing the sensor to adapt to different measurement scenarios and improve accuracy when needed.
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
Improves conductivity detection accuracy by correcting measurements, enabling more precise hydraulic oil state assessment.
Implementation Method 1
a voltage acquisitor configured to acquire an inter-electrode voltage value via an electrode
Implementation Method 2
detecting the capacitance and resistance values from an inter-electrode voltage value
Implementation Method 3
detect a resistance value from the inter-electrode voltage value acquired at the voltage acquisitor and calculate a conductivity of the fluid
Implementation Method 4
detect a capacitance value from a inter-electrode voltage value acquired in a voltage acquisitor and calculate a relative permittivity of the hydraulic oil
Implementation Method 5
calculating the relative permittivity and the conductivity of the hydraulic oil
Data Source
AI summary
A fluid state detection sensor accurately detects a fluid state by suppressing the deterioration of a conductivity measurement accuracy due to its characteristics. The sensor includes an electrode section configured by a pair of electrodes arranged opposite each other, a conductivity acquisition unit detecting a resistance value from an inter-electrode voltage value acquired through the electrode section and acquiring a fluid conductivity, a controller executing entire sensor's processing according to a control program stored in ROM etc., a memory storing correction values for fluid whose conductivity is greater than a predetermined value calculated by a conductivity calculator, which calculates the fluid conductivity from the inter-electrode voltage value, a corrector correcting the conductivity calculator calculated conductivity using the correction value stored in the memory when the fluid whose conductivity calculator calculated conductivity is greater than the predetermined value, and an output section outputting corrected conductivity.