Hydraulic Pressure Control Using Armature Stroke Estimation
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Solution Overview
Problem
Conventional techniques fail to accurately estimate the stroke amount of the armature in electromagnetic valves used in hydraulic pressure control units, which is crucial for optimal valve operation.
Innovation Solution
A hydraulic pressure control unit with a controller that estimates the stroke amount of the armature based on the reduced current value when the current through the wire increases towards a target value, utilizing the phenomenon of counter-electromotive force generated during armature movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional techniques are used to estimate armature stroke amount, then the estimation process is simple, but the estimation accuracy is insufficient
Solution Approach 1:
The patent employs feedback by continuously monitoring the current value through the wire and using the reduced amount of current value as feedback information to estimate the armature stroke amount. The controller adjusts the estimation based on the feedback from current measurements, improving accuracy without requiring additional sensors.
Solution Approach 2:
The system uses its own operational parameters (current value through the wire) to estimate the armature stroke amount. The electromagnetic valve's own electrical characteristics are exploited to provide self-diagnosis capability, eliminating the need for external measurement devices.
2Measurement precision
If direct stroke sensors are installed to measure armature stroke amount, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces the current value through the wire as an intermediary parameter to indirectly measure the armature stroke amount. Instead of directly measuring stroke, the system measures the electrical intermediary (current) that correlates with stroke position, avoiding direct mechanical contact sensors.
Solution Approach 2:
The patent replaces mechanical stroke sensors with an electrical measurement system. By substituting mechanical measurement devices with electrical current monitoring, the system achieves non-contact measurement, reducing mechanical complexity and improving reliability.
3Measurement precision
If the current value is continuously monitored to estimate stroke amount, then estimation accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs periodic monitoring of the current value at specific intervals during operation, particularly at beginning of current application. This periodic measurement approach provides sufficient estimation accuracy while minimizing continuous energy consumption compared to constant monitoring.
Solution Approach 2:
The patent monitors current value with higher precision and frequency only when necessary (at beginning of current application), rather than continuously at full capacity. This partial monitoring strategy provides adequate estimation accuracy for critical phases while reducing overall energy consumption.
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 method allows for accurate estimation of the armature stroke amount, ensuring proper valve function without the need for direct stroke sensors, and improves estimation accuracy by considering viscosity and target current values.
Implementation Method 1
an electromagnetic valve that includes a wire and an armature that moves in association with application of a current to the wire
Implementation Method 2
a phenomenon that a counter-electromotive force is generated to the wire in association with movement of the armature
Data Source
AI summary
The present invention obtains a hydraulic pressure control unit capable of accurately estimating a stroke amount of an armature of an electromagnetic valve.The hydraulic pressure control unit according to the present invention includes an estimation section that estimates a stroke amount (Δx) of an armature (312) of an electromagnetic valve (31). The estimation section estimates a stroke amount (Δx) on the basis of a reduced amount of a current value at a time when the current value is temporarily reduced in a process that the current value of a current flowing through a wire (314) is increased toward a target current value at beginning of application of the current to the wire (314) of the electromagnetic valve (31).