Armrest Temperature Control Using Body-Surface Feedback
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Solution Overview
Problem
Existing armrests in vehicles fail to maintain a comfortable surface temperature for passengers, often causing discomfort due to excessive heating or slow warming, especially in varying environmental conditions.
Innovation Solution
A temperature control system that includes a mounting portion with a temperature adjuster, body temperature sensor, and surface temperature sensor, controlled by a controller to maintain a comfortable surface temperature without a separate switch, using sensors to detect passenger arm proximity, pressure, and tilt to adjust heating output accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the temperature of the heating wire is increased to warm the armrest surface, then the warming speed is improved, but the surface temperature may excessively increase causing discomfort
Solution Approach 1:
The system uses surface temperature sensors to continuously monitor the armrest surface temperature and body temperature sensors to detect passenger body temperature. The controller adjusts the heating wire output based on the temperature difference between the surface and the passenger's body, creating a closed-loop feedback system that prevents excessive heating while maintaining comfortable warmth.
Solution Approach 2:
The heating system transitions from static fixed-stage temperature control to dynamic adaptive control. The heating output automatically adjusts in real-time based on detected temperature differences, passenger presence, and environmental conditions, allowing the system to optimize warming speed while preventing overheating.
2Power
If the heating wire temperature is manually set to a high level, then the warming capability is improved, but the passenger comfort deteriorates due to excessive heat
Solution Approach 1:
The controller receives continuous temperature data from surface temperature sensors and body temperature sensors, comparing the armrest surface temperature with the passenger's body temperature. Based on this feedback, the controller dynamically adjusts the heating wire power output to maintain optimal comfort levels, preventing the harmful effect of excessive heat while ensuring adequate warming capability.
Solution Approach 2:
The system automatically detects passenger presence through body temperature sensors and tilt sensors, then self-adjusts the heating power without requiring manual intervention. The system serves itself by monitoring temperature differences and autonomously optimizing heating output to balance warming effectiveness with passenger comfort.
3Temperature
If the heating wire operates at low temperature, then passenger comfort is maintained, but the warming time increases significantly
Solution Approach 1:
The system employs periodic or pulsed heating action based on detected conditions. When a passenger is detected and the temperature difference exceeds a threshold, the heating wire operates at higher power to quickly reduce the temperature gap. Once the comfortable temperature range is achieved, the system reduces power to maintenance levels, creating a periodic heating pattern that minimizes warming time while maintaining comfort.
Solution Approach 2:
The heating system dynamically adjusts power output based on real-time temperature measurements and passenger presence detection. The controller increases heating power when rapid warming is needed (large temperature difference) and reduces power when the target temperature is approached, optimizing the balance between warming speed and comfort maintenance throughout the heating process.
4Adaptability or versatility
If manual temperature adjustment is provided, then passenger control flexibility is improved, but device complexity increases due to separate switches and controls
Solution Approach 1:
The system eliminates manual switches and controls by implementing self-service automatic temperature adjustment. Body temperature sensors detect passenger presence and measure body temperature, while tilt sensors detect armrest usage. The controller automatically adjusts heating power based on these sensor inputs, providing adaptive temperature control without requiring any manual operation from the passenger.
Solution Approach 2:
The sensor system serves multiple functions: body temperature sensors both detect passenger presence and measure body temperature for control calculations, tilt sensors detect both armrest usage and can indicate usage intensity, and surface temperature sensors monitor both current temperature and temperature change trends. This multi-functionality reduces the need for separate dedicated components, simplifying the overall control system while maintaining high adaptability.
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 system ensures passenger comfort by dynamically adjusting the armrest temperature to match the passenger's body temperature, providing quick warming and preventing excessive heat, thus enhancing the overall vehicle environment experience.
Implementation Method 1
a heating wire is disposed on a lower surface of the pad part. The user manually sets a temperature of the heating wire, and the temperature of the heating wire rises according to an output value set in stages
Implementation Method 2
a body temperature sensor provided to the mounting portion to measure a temperature of the arm of the passenger in contact with the mounting portion
Implementation Method 3
a surface temperature sensor configured to measure the temperature of the surface of the mounting portion
Data Source
AI summary
A control system of a mounting portion upon which an arm of a passenger rests may include: the mounting portion upon which the arm of the passenger lays down and rests, a temperature adjuster provided to the mounting portion to increase a temperature of a surface of the mounting portion, a body temperature sensor provided to the mounting portion to measure a temperature of the arm of the passenger in contact with the mounting portion, a surface temperature sensor configured to measure the temperature of the surface of the mounting portion, and a controller configured to control an output of the temperature adjuster based on a difference between the temperature of the surface of the mounting portion measured by the surface temperature sensor and the temperature of the arm of the passenger measured by the body temperature sensor.


