Dosing Device with Electric Drive for Viscous Medium Application
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Solution Overview
Problem
Existing methods for the automated application of viscous or liquid media to vehicle body components face challenges in achieving precise and temporally exact control of volume flow and outlet pressure, leading to irregularities and deviations due to non-constant viscosity and system changes, resulting in suboptimal adhesive application.
Innovation Solution
A method that records material properties in the dosing device, calculates required volume flow and outlet pressure values, and actuates the outlet valve and displacement drive with a time advance to compensate for signal transmission delays, ensuring precise application by using an electric drive for the displacer and considering the planned application pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic or pneumatic drive devices are used for the displacer, then the system can operate, but time accuracy and reaction speed are insufficient leading to control delays
Solution Approach 1:
The patent replaces hydraulic or pneumatic drive systems with an electric drive system for the displacer. This substitution eliminates the inherent delays and inaccuracies associated with hydraulic/pneumatic actuation while achieving precise time control and rapid response. The electric drive directly responds to control signals from the controller, enabling accurate synchronization between the outlet valve operation and displacer movement, thereby resolving the technical contradiction between reliability (time accuracy) and device complexity.
2Manufacturing precision
If feedback control with continuous measurement is used to adjust volume flow and pressure, then precision can be improved, but control time delays and complexity increase
Solution Approach 1:
The patent implements preliminary action by pre-calculating the required volume flow and outlet pressure values based on stored data sets containing medium properties and application pattern requirements. The controller determines the necessary displacer position and outlet valve timing in advance, and transmits control signals with a time advance to compensate for signal transmission delays. This predictive approach eliminates the need for continuous feedback measurement and real-time adjustment, thereby achieving high application precision without incurring control time delays.
3Stress or pressure
If the outlet valve opening phase is extended to ensure adequate pressure buildup, then pressure stability improves, but the response time and temporal accuracy of medium application deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-positioning the displacer at a calculated position that ensures adequate outlet pressure is achieved immediately when the outlet valve opens. The controller calculates the optimal displacer position based on medium properties and application requirements, then moves the displacer to this position in advance. This eliminates the need for an extended valve opening phase to build pressure, as the pressure is already established through the pre-positioned displacer, thereby maintaining both pressure stability and fast response speed.
Solution Approach 2:
The patent employs dynamics by dynamically adjusting the displacer position and outlet valve timing based on real-time control signals. The electric drive system enables rapid, precise movement of the displacer to maintain optimal pressure conditions without requiring extended valve opening times. The system adapts the displacer position dynamically to match the instantaneous requirements of the application process, achieving both pressure stability and fast response through active dynamic control rather than static extended timing.
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 consistent and precise application of the medium, eliminating deviations and maintaining accuracy throughout the process, even under changing conditions, by predicting flow behavior and adjusting parameters in real-time, thus optimizing the application pattern on the component.
Implementation Method 1
a displacer (6) arranged in the dosing chamber (4) and connected to a displacer drive (7), by which the medium (1) can be compressed and conveyed in the dosing chamber (4), increasing or decreasing the chamber volume depending on the direction of movement
Data Source
AI summary
A method for the automated application of a viscous or liquid medium (1) to components, in particular body parts of a motor vehicle, in which a metering device (3) and the component are moved relative to each other at a feed rate, and in which a control unit connected to the metering device (3) controls the volume flow rate and the outlet pressure of the medium (1). According to the invention, the material properties of the medium (1) are determined in the metering device (3), and its flow properties are derived from these determinations. The control unit then calculates the required volume flow rate and outlet pressure values, taking into account stored data sets regarding the intended path and the application pattern of the medium (1), and accordingly actuates a displacement drive (7) of a displacement pump (6) in a metering chamber (4) of the metering device (3) and an outlet valve (5) of the metering device (3).In addition, a time offset of the control signals is incorporated to compensate for control-related time delays in the control of the displacement drive (7) and the exhaust valve (5).