Vehicle Sunroof Control via Touch Panel Mechanics
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Solution Overview
Problem
Existing methods for controlling electrically adjustable sunroofs in vehicles using touch-sensitive touchpads face challenges in differentiating between swiping and tapping movements, leading to complexity and potential accidental actuation, and require sensitive sensors and complex algorithms to ensure safe and intuitive operation.
Innovation Solution
A method utilizing a touch-sensitive touch panel that distinguishes between swiping and tapping movements by registering touch panel movement, allowing intuitive control of the sunroof with swiping for open and closed positions and tapping for activation and abort commands, including a lifted position, without the need for complex sensors or algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch-sensitive keypads with sensitive sensors and complex algorithms are used to differentiate swiping and tapping movements, then the control precision and safety are improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex capacitive touch sensors with simple mechanical switches that detect physical depression of the touch panel. This mechanical approach simplifies the sensing mechanism while maintaining the ability to distinguish between different user inputs (swiping vs. tapping) through the depression detection feature.
Solution Approach 2:
The patent employs simple, inexpensive mechanical switches instead of expensive, complex capacitive sensor systems. The mechanical switches are cost-effective components that provide reliable input detection without requiring sophisticated signal processing algorithms.
2Reliability
If complex algorithms are used to ensure safe and intuitive operation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex software algorithms with simple mechanical switch mechanisms. The physical depression detection provides inherent reliability through mechanical feedback, eliminating the need for complex computational algorithms to interpret touch inputs.
Solution Approach 2:
The mechanical switches provide self-evident operational feedback through their physical state (depressed or not depressed). The system relies on the natural mechanical properties of the switches to indicate user intent, rather than requiring complex algorithmic interpretation of sensor data.
3Ease of operation
If the touch panel is designed to detect subtle finger movements, then the ease of operation is improved, but the susceptibility to accidental actuation increases
Solution Approach 1:
The patent replaces sensitive capacitive touch detection with mechanical switch depression detection. The mechanical approach requires deliberate physical pressure to activate, which naturally filters out accidental contacts while maintaining ease of intentional operation.
Solution Approach 2:
The mechanical switch design inherently prevents accidental actuation by requiring a deliberate depression action. The physical mechanism is designed to respond only to intentional user input, counteracting the problem of false activation before it can occur.
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
Enables easy, intuitive, and reliable operation of the sunroof, reducing noise and providing ventilation while protecting occupants from the sun, with enhanced safety and aesthetic design by avoiding unnecessary design measures to prevent accidental triggering.
Implementation Method 1
Such touch-sensitive keypads have a two-dimensional sensor structure and detect the touch of one or more fingers, for example, based on the concept of 'mutual capacitance'. Mutual capacitance is the capacitive coupling between objects, or the capacitance that occurs between two charge carriers or conductors
Data Source
Figure 1
Figure 2a~2c
AI summary
The invention relates to a method for controlling an electrically movable sunroof (26) of a motor vehicle (12), by means of a touch-sensitive touch pad (30) as the operating unit (28), as a result of which the sunroof is particularly simple to operate. The method comprises the following method steps: movement of the sunroof (26) into a closed position is effected by a first swiping motion (32) across the touch pad (30); movement of the sunroof (26) into an open position is effected by a second swiping motion (38) in the opposite direction to the first across the touch pad (30); a specific actuation of the sunroof (26) which is dependent on a position or movement of the sunroof (26) is effected, said actuation being achieved by a tapping motion (42) on the touch pad (30). The invention further relates to a sunroof device and to a motor vehicle for implementing such a method.