Vehicle Window Positioning via Spring Stiffness Monitoring
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Solution Overview
Problem
Existing systems for determining the position of movable vehicle elements, such as windows or sunroofs, face challenges in maintaining accurate positioning due to wear, voltage fluctuations, and climatic influences, often resulting in noise and unnecessary wear from premature compression of elastic mounts.
Innovation Solution
A control device that continuously monitors and adjusts the spring stiffness during movement, determining the position point by exceeding a threshold value, allowing for reliable positioning independent of wear and climatic changes, and recalculates this position after a defined number of insertion processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the movable element moves into the elastic mount without braking, then the drive system is simpler, but clearly audible noises occur and wear increases
Solution Approach 1:
The control device determines the position point before the movable element actually enters the elastic mount by monitoring spring stiffness changes. This preliminary determination allows the drive to be switched off in advance, preventing the element from moving into the mount with excessive speed and force, thereby avoiding noise and wear without requiring complex braking mechanisms.
Solution Approach 2:
The system continuously monitors the spring stiffness of the elastic mount during movement and uses this feedback to determine when the position point is reached. This real-time feedback mechanism enables precise control of the stopping position, ensuring the movable element is stopped before excessive compression occurs, thus preventing noise and wear while maintaining simple drive system design.
2Device complexity
If the position for stopping the movable element is determined from indirectly measured position, then the control system is simpler, but the desired stopping position often does not match due to wear, voltage fluctuations or climatic influences
Solution Approach 1:
The system replaces indirect position measurement methods with direct physical property monitoring by measuring spring stiffness. This substitution provides a more accurate and reliable indication of the movable element's position, as spring stiffness directly reflects the compression state of the elastic mount, making the stopping position determination independent of wear, voltage fluctuations, and climatic influences.
3Device complexity
If the drive is stopped when blockage is detected from current curve increase, then the drive system is simpler, but the movable element enters the elastic mount without braking causing noise
Solution Approach 1:
The control device continuously monitors spring stiffness during movement and uses this feedback to determine the position point before the movable element enters the elastic mount. This allows the drive to be switched off proactively, preventing noise-causing impact, rather than waiting for blockage detection after the element has already entered the mount with excessive speed.
Solution Approach 2:
The system determines the position point in advance by monitoring changes in spring stiffness before the movable element actually contacts the elastic mount with excessive force. This preliminary action enables the drive to be switched off before noise-generating impact occurs, rather than reacting to blockage after the damage is already done.
4Device complexity
If a predetermined mathematical function is used to determine speed and power reduction, then the control system is simpler, but the position determination is less accurate due to wear and climatic influences
Solution Approach 1:
The system replaces predetermined mathematical functions with direct monitoring of spring stiffness physical properties. This substitution provides real-time, accurate measurement of the elastic mount's state, making position determination independent of wear and climatic influences, as the actual physical condition of the mount is measured rather than calculated based on assumptions.
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
Ensures accurate and noise-free operation by preventing the movable element from compressing the elastic mount excessively, adapting to wear and climatic changes, thereby reducing wear on the drive system and ensuring reliable sealing.
Implementation Method 1
the spring stiffness, in that a blocking of the drive is avoided by continuously determining and monitoring a spring stiffness during a movement of the movable element into the elastic receptacle
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a method for determining a position point of a movable element, particularly a window (33) or a roof of a motor vehicle that can be advanced into at least one elastic receptacle (36) by means of a drive, comprising the steps of continually determining a spring stiffness in relation to the moving element (33) in the elastic receptacle (36) and determining a position point upon exceeding a specified spring stiffness threshold value.