Hydraulic Valve Holding Current Control via End-Position Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling the holding current in electromagnetically actuated hydraulic valves are inefficient, leading to excessive energy consumption and reduced service life due to high and unregulated holding currents, which are often manually adjusted and not accurately set, and are influenced by external factors like temperature.
Innovation Solution
A method that dynamically determines the holding current by monitoring the current curve during the switching operation, detecting the end position, and adjusting the current to the determined holding current, reducing energy consumption and compensating for external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed proportion holding current (e.g., 60% of saturation current) is applied to the electromagnet, then the switching element is held in the end position, but the holding current is significantly higher than the minimum required current, causing unnecessary heating and increased energy consumption
Solution Approach 1:
The control unit continuously monitors the actual holding current and compares it with the minimum required holding current. Based on this feedback, the control unit dynamically adjusts the holding current to maintain the switching element in the end position while minimizing energy consumption. This feedback mechanism eliminates the need for fixed proportion holding current and prevents unnecessary heating.
Solution Approach 2:
The holding current is transformed from a static fixed proportion value to a dynamic value that adapts to actual operating conditions. The control unit continuously adjusts the holding current based on real-time monitoring of the switching element position and electromagnetic field conditions, enabling the system to use the minimum necessary current rather than a conservative fixed proportion.
2Reliability
If the holding current is increased to compensate for temperature influences, then the switching element remains reliably held in the end position, but the electromagnet heats up excessively and service life is reduced
Solution Approach 1:
The control unit monitors the actual holding current and electromagnetic field conditions in real-time, adjusting the current dynamically to maintain reliable holding while minimizing heat generation. This feedback control replaces the conservative approach of using high fixed current with a precise adaptive approach that maintains reliability without excessive heating.
Solution Approach 2:
The holding current parameter is changed from a fixed high value to a dynamically adjusted value that adapts to temperature conditions. The control unit modifies the current parameter based on real-time monitoring, enabling the system to maintain reliable operation across temperature variations without sustaining excessively high current levels that cause heating.
3Adaptability or versatility
If manual adjustment of holding current via potentiometer is performed, then the holding current can be customized, but the process is time-consuming and lacks sufficient accuracy, negatively impacting service life and energy efficiency
Solution Approach 1:
The control unit automatically determines and adjusts the holding current without requiring manual intervention. The system performs self-calibration by monitoring the switching element position and electromagnetic field conditions, eliminating the time-consuming manual potentiometer adjustment process while maintaining or improving accuracy.
Solution Approach 2:
The mechanical potentiometer adjustment system is replaced with an automated electronic control system. The control unit uses electronic sensing and calculation to determine the optimal holding current, replacing the manual mechanical adjustment process with an automated electronic procedure that is both faster and more accurate.
4Ease of operation
If automated setting via preset parameters is implemented, then the setup process is simplified, but it creates variants and binds the control unit to specific valve configurations
Solution Approach 1:
The control unit automatically determines the optimal holding current by monitoring the actual operating conditions of the specific valve configuration. This self-service approach eliminates the need for preset parameters and variant configurations, as the system adapts to each valve's characteristics through real-time sensing and automatic adjustment.
Solution Approach 2:
Instead of using fixed preset parameters that create variants, the control unit dynamically determines the holding current parameter based on actual operating conditions. This parameter change approach allows the control unit to work with any valve configuration without requiring specific preset values, reducing device complexity while maintaining ease of operation.
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 efficient and accurate determination of the holding current, reducing energy consumption and preventing excessive heating, thereby extending the service life of the electromagnet and simplifying the setup process.
Implementation Method 1
The electromagnet has a coil and an armature. The armature is connected to the switching element for joint movement. To perform a switching operation, a current is applied to the coil to move the armature together with the switching element from an initial position to an end position.
Implementation Method 2
the switching element remains in or returns to the initial position when the electromagnet is de-energized, for example by a biasing force or a spring force acting on the switching element.
Data Source
AI summary
A method for switching an electromagnetically actuable hydraulic valve including a switching element and an electromagnet having a coil and an armature connected to the switching element for joint movement. When a current is applied to the coil, the armature moves together with the switching element from an initial position to an end position for a switching operation. The method includes the following steps: applying a switching voltage to the coil of the electromagnet to initiate the switching operation; capturing the current curve over time; reaching-detection of the end position of the switching element; determining a holding current taking into account the reaching-detection of the end position of the switching element and the captured current curve; and reducing the current applied to the coil to the determined holding current. A hydraulic valve with a control unit which performs the disclosed method is also disclosed.