Vehicle Sensor Arrangement Thermal Decoupling
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Solution Overview
Problem
Existing sensor arrangements for determining interior vehicle temperature are affected by direct sunlight, air circulation, peripheral device temperature, and body temperature, leading to inaccurate temperature regulation due to external influences.
Innovation Solution
A sensor arrangement with a second temperature sensor attached to the inner side of the rear wall within the housing, allowing for the detection and evaluation of heat sources and thermal radiation, which enables more accurate and rapid temperature measurement without active ventilation, and uses an energy balance model to correct for external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is attached to the front wall for precise temperature determination, then measurement precision is improved, but the sensor is affected by direct sunlight and external heat sources causing inaccurate measurements
Solution Approach 1:
The patent introduces a second temperature sensor as an intermediary measurement point located behind the front wall. This intermediary sensor measures the temperature of the housing structure itself, which is affected by external heat sources. The control unit then uses this intermediary measurement to compensate for and eliminate the influence of external heat sources on the primary temperature sensor's reading, thereby resolving the contradiction between measurement precision and susceptibility to harmful factors.
Solution Approach 2:
The system implements a feedback mechanism where the second temperature sensor continuously monitors the housing temperature affected by external sources. This information is fed back to the control unit, which calculates the interference temperature and subtracts it from the primary sensor's reading. This feedback loop enables dynamic compensation for sunlight and heat source interference, maintaining accurate temperature measurements despite external thermal influences.
2Device complexity
If the sensor arrangement is miniaturized, then device complexity is reduced, but thermal coupling and measurement accuracy may be compromised
Solution Approach 1:
The patent applies the nesting principle by placing the second temperature sensor within the housing structure behind the front wall, effectively nesting the compensation sensor within the existing sensor arrangement. This nested configuration allows both sensors to be integrated into a compact unit without requiring separate housings or complex mounting structures, achieving miniaturization while maintaining the thermal coupling necessary for accurate compensation measurements.
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 allows for precise and quick temperature recording, enabling more accurate climate control by minimizing interference from heat sources and external factors, while allowing for a smaller sensor design and improved thermal decoupling.
Implementation Method 1
a first temperature sensor (4) which is fastened on a rear side of the front wall (2) in good thermal contact with the front wall (2)
Implementation Method 2
The sensor arrangement (1) is filled with a heat-insulating medium (7)
Implementation Method 3
heat sources radiating from the rear of the sensor arrangement can be recorded in terms of temperature
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to a sensor arrangement (1) for determining an interior temperature in a motor vehicle, which sensor arrangement (1) is at least one part of an air-conditioning operating part (8), comprising a closed housing (2, 3) having at least one front wall (2) and one rear wall (3), wherein the front wall (2) is manufactured from a material which ensures satisfactory thermal transfer and the housing (2, 3) is filled with a thermally insulating means (7), further comprising a first temperature sensor (4) which is fastened to a rear side of the front wall (2) and a second temperature sensor (5) which interacts with the first temperature sensor (4) at least in relation to an evaluation of the interior temperature, wherein the at least second temperature sensor (5) is fastened on an inner side of the rear wall (3) which faces the rear side of the front wall.