Capacitive Sensor Sensitivity Adaptation for Sliding Door Control
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Solution Overview
Problem
Existing sliding door sensor systems for motor vehicles require excessive construction effort and multiple components, and their detection accuracy can be improved.
Innovation Solution
A capacitive sensor electrode is placed between the sliding door and the vehicle floor, coupled with a control and evaluation circuit that adapts sensitivity based on the sliding door's position, using varying threshold values and charge accumulation cycles to enhance detection accuracy and reduce component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensor electrodes are arranged in the sliding door area to detect operating gestures, then detection coverage is improved, but construction effort and component count increase
Solution Approach 1:
A single capacitive sensor electrode is designed to perform multiple detection functions (opening request, closing request, anti-trapping protection) by dynamically adjusting its evaluation parameters based on the sliding door's position, eliminating the need for multiple separate sensor electrodes
Solution Approach 2:
The sensor electrode's sensitivity and evaluation threshold are dynamically adjusted according to the sliding door position, allowing one sensor to adapt its detection characteristics for different operating modes and positions
2Device complexity
If a single sensor electrode is used to detect all operating gestures, then component count is reduced, but detection accuracy for different door positions deteriorates
Solution Approach 1:
The evaluation parameters (threshold values, sensitivity, charge accumulation cycles) of the single sensor electrode are changed based on the detected sliding door position, enabling accurate detection of different operating gestures (opening, closing, anti-trapping) with one sensor
Solution Approach 2:
The system continuously monitors the sliding door position and uses this feedback information to adjust the sensor electrode's evaluation parameters in real-time, ensuring optimal detection accuracy for each door position
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 solution reduces the number of components needed and improves detection accuracy by dynamically adjusting sensitivity and evaluation criteria based on the sliding door's position, effectively handling opening, closing, and anti-trapping protection requests.
Implementation Method 1
A capacitance forms between the sensor electrode, which is brought to a predetermined potential, and a reference electrode, e.g. the vehicle ground or the ground under the vehicle. This capacitance can be changed if a body moves in the sensitive area of the sensor arrangement
Data Source
Figure 1a~1b
AI summary
A device for controlling the drive of a sliding door on a vehicle (1), wherein the sliding door (2) is movable along a path of movement between two end positions on the vehicle. A control and evaluation unit (5) is coupled to a capacitive sensor device (3), the sensor device being designed for non-contact detection of objects in a spatial area. The drive (7) of the sliding door is coupled to the control and evaluation unit (5) of the sensor device, so that the control and evaluation unit (5) receives position information about the position of the sliding door (2) on its path of movement. Depending on the position information, the control and evaluation unit (5) either controls the sensor device (3) to adjust its sensitivity or evaluates the signals from the sensor device depending on the position information.