Solenoid Valve Dosing Timing for Stiction-Free Precision Shots
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Solution Overview
Problem
Existing solenoid valves for dosing methods face challenges in achieving precise and quick dosing operations due to issues like valve sticking and the need for pre-treatment shots, which increase material costs and production times.
Innovation Solution
A dosing method that involves determining the operating duration between the provision of the coil current and the first start of movement of the valve member, and adjusting the coil current duration by this operating duration to ensure precise control of the solenoid valve, thereby avoiding pre-treatment shots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coil current is supplied to the solenoid for a sufficient duration to ensure valve member movement, then the dosing precision is improved, but the production time increases due to the need for pre-treatment shots
Solution Approach 1:
The system determines the operating duration (time offset) between coil current provision and actual valve member movement in advance, then uses this information to adjust the coil current duration for subsequent dosing operations. This preliminary characterization of the system's temporal behavior enables precise dosing without requiring pre-treatment shots, thereby reducing production time while maintaining dosing precision.
2Reliability
If the coil current duration is extended to account for the time offset, then the valve member reliability in reaching functional position is improved, but the dosing operation duration increases
Solution Approach 1:
The system dynamically adjusts the coil current duration based on the determined operating duration. Rather than using a fixed, overly conservative duration that extends all dosing operations, the system optimizes the current duration for each specific dosing operation based on the characterized time offset, thereby maintaining reliability while minimizing operation duration.
3Reliability
If pre-treatment shots are used to prevent valve sticking, then the valve reliability is improved, but the material cost and production time increase
Solution Approach 1:
The system uses feedback from detecting the actual start of valve member movement to determine the operating duration, then applies this information to optimize subsequent dosing operations. This feedback mechanism eliminates the need for pre-treatment shots by ensuring that each dosing operation is properly timed from the outset, thereby preventing valve sticking without wasting substrate material.
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 ensures accurate and efficient dosing operations by maintaining the solenoid valve in the functional position for the desired duration, reducing substrate loss and production times, and eliminating the need for costly pre-treatment shots.
Implementation Method 1
The solenoid is configured for magnetic interaction with the valve member, which is also known as a plunger or a valve solenoid. When an electrical coil current is supplied to the solenoid, a magnetic force is exerted on the valve member to cause a relative movement with respect to the solenoid.
Data Source
AI summary
A dosing method for carrying out at least one dosing operation, including the steps: providing a switching signal to or from a valve control, providing a coil current from the valve control to a magnetic drive in dependence on the switching signal, in which the magnetic drive is configured to move a valve member of a solenoid valve between a normal position and a functional position, determining a first start of movement of the valve member from the normal position to the functional position, determining an operating duration between the provision of the coil current and the first start of movement, determining a providing duration for the switching signal. The provision of the coil current is carried out over a coil current duration which corresponds to a sum of the providing duration and the operating duration.