Adaptive Proximity Sensor Control for Vehicle Smart Opener
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Solution Overview
Problem
In vehicles equipped with automatically opening and closing lids, the proximity sensors used in 'smart opener' systems can be falsely triggered by salt and moisture, leading to unintended activation during winter conditions, as the sensors become sensitive to moisture and salt crusts, making it difficult to distinguish between valid kicks and unwanted openings.
Innovation Solution
The control device adapts the parameter set of the proximity sensors based on environmental conditions such as temperature, precipitation, and windshield wiper usage to reduce sensitivity during winter mode, preventing false triggers, and can increase sensitivity in summer mode for improved functional safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the proximity sensor sensitivity is increased to improve detection of valid kicks, then the smart opener function becomes more responsive, but false triggering by salt and moisture increases
Solution Approach 1:
The sensor sensitivity is made dynamically adjustable through two operating modes: a first operating mode with higher sensitivity for summer conditions and a second operating mode with lower sensitivity for winter conditions. The control unit automatically switches between modes based on environmental conditions (temperature, precipitation, windshield wiper usage), allowing the system to optimize detection performance while minimizing false triggers caused by salt and moisture accumulation.
Solution Approach 2:
The evaluation parameters of the proximity sensor are changed based on environmental conditions. The control unit modifies the sensor's sensitivity parameter by switching between different operating modes. In the first operating mode (summer), the sensor operates with higher sensitivity to detect valid kicks. In the second operating mode (winter), the sensor operates with reduced sensitivity to prevent false triggering from salt and moisture, effectively adapting the detection threshold to environmental conditions.
2Reliability
If additional protective apparatus are installed to prevent salt and moisture contamination, then sensor reliability improves, but device complexity and cost increase
Solution Approach 1:
The patent replaces potential mechanical protective structures (such as shields or covers) with an electronic/software-based solution. Instead of physically protecting the sensor from salt and moisture, the control unit uses environmental condition detection (temperature, precipitation, windshield wiper status) to automatically switch the sensor between different operating modes, adjusting sensitivity parameters to prevent false triggering. This electronic adaptation approach avoids adding mechanical complexity while maintaining reliability.
3Measurement precision
If the sensor operates with high sensitivity year-round, then kick detection remains consistent, but false triggering occurs during winter with salt and moisture
Solution Approach 1:
The sensor operates dynamically with different sensitivity levels depending on seasonal conditions. During summer months, the sensor maintains high sensitivity for accurate kick detection. During winter months, when salt and moisture are present, the sensor automatically switches to a second operating mode with reduced sensitivity, preventing false triggering while maintaining adequate detection capability for valid kicks.
Solution Approach 2:
The control unit continuously monitors environmental conditions (temperature, precipitation, windshield wiper usage) and uses this feedback to determine when to switch between operating modes. This feedback mechanism allows the system to automatically adapt to changing environmental conditions, switching to the appropriate sensitivity level based on the presence of salt and moisture indicators, thereby preventing false triggering while maintaining detection accuracy.
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 adaptation effectively reduces false triggering of the smart opener function during winter conditions by reducing sensor sensitivity in the presence of salt and moisture, while maintaining high functional safety without the need for additional protective apparatus, and enhances performance in summer months.
Implementation Method 1
A moisture salt crust increases the capacitive property and hence the sensitivity of the round conductor
Data Source
AI summary
A control device relates to a vehicle having an automatically opening and/or automatically closing lid with at least one control switch in the vicinity of the lid and with a programmable electronic control unit. The control switch may be operated arbitrarily contactlessly in the form of a proximity sensor and when operated generates an operation request signal which is an input signal to the control unit. The control unit is configured in such a manner that defined environmental conditions may be evaluated for the detection of a risk of salinity and humidity and that, given the presence of a risk of salt and water, an appropriate adaptation may be made to the evaluation of the operation request signal. Preferably, at least one outside temperature below a predefined threshold and information indicating the presence of moisture are defined as the environmental conditions to be evaluated for detecting the risk of salt and water.