Vehicle Armrest Heating Control via Capacitive Sensor
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Solution Overview
Problem
Heated armrests in vehicles require additional switching elements for controlling the heating element, leading to energy consumption when forgotten on and increased complexity in control mechanisms.
Innovation Solution
An armrest design featuring a sensor element with an electrode and counter electrode connected to a control unit, which automatically switches the heating element on or off based on the distance change caused by a vehicle passenger's contact, eliminating the need for additional switching elements and allowing the heating element to be integrated into the decor layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If additional switching elements are provided to control the heating element, then the heating function can be controlled, but the device complexity increases
Solution Approach 1:
The armrest heating system automatically detects when a passenger is present through sensor elements (capacitive, optical, or other detection methods) and activates the heating element without requiring manual switching. The system serves itself by monitoring its own usage conditions and adjusting operation accordingly, eliminating the need for separate control switches.
Solution Approach 2:
The sensor elements serve dual purposes: they detect passenger presence for heating control while also potentially serving as part of the overall control interface for the armrest system. This multi-functionality reduces the need for dedicated switching elements by combining detection and control functions in existing components.
2Ease of operation
If the heating element is controlled by additional switching elements, then heating can be activated, but energy is consumed permanently when forgotten on
Solution Approach 1:
The system continuously monitors passenger presence through sensor elements and uses this feedback to automatically control the heating element. When no passenger is detected, the heating is automatically deactivated, preventing energy waste from forgotten switching. The feedback loop ensures heating operates only when needed, optimizing energy consumption.
Solution Approach 2:
The heating system automatically manages its own operation by detecting passenger presence and adjusting heating activation accordingly. The system serves itself by eliminating the need for manual switching, thereby preventing energy waste from forgotten controls while maintaining convenient automatic operation.
3Ease of operation
If switching and control elements are provided, then the heating can be controlled, but the number of components increases
Solution Approach 1:
The sensor elements that detect passenger presence are integrated with or adjacent to the heating element, combining the detection and heating functions in a unified structure. This merging eliminates the need for separate switching elements, reducing the total number of components while maintaining full heating control functionality.
Solution Approach 2:
The system uses its existing sensor elements to automatically control the heating element, eliminating the need for additional switching components. The heating system serves itself by using the same sensor infrastructure to both detect presence and control heating operation, thereby reducing component quantity.
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
The solution provides intuitive control of the heating element, reducing energy wastage and simplifying the control mechanism by using the passenger's contact to activate and deactivate the heating, ensuring efficient energy use and minimizing additional components.
Implementation Method 1
The sensor element is designed to send an electric sensor signal to the control unit when the distance between electrode and counter electrode changes at least in some regions
Implementation Method 2
a heating element is arranged, at least in sections, on the decor layer
Data Source
AI summary
An armrest for an interior equipment part of a motor vehicle includes a decor layer, a support element, a cushion element disposed at least in sections between the support element and the decor layer, and a heating element disposed at least in sections on the decor layer. Furthermore, the armrest includes a sensor element that includes an electrode and a counter electrode. The sensor element is electrically connected to a control unit, wherein the sensor element is designed to send an electric sensor signal to the control unit when the distance between the electrode and the counter electrode changes at least in regions, and the control unit is designed to switch the heating element off and/or on as a function of the sensor signal.