HVAC Sensor Temperature Correction for Internal Heat Offset
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Solution Overview
Problem
Climate control systems, such as HVAC systems, face inaccuracies in temperature measurement due to heat generated by internal components, especially during startup, which affects the system's ability to efficiently control environmental conditions.
Innovation Solution
A method and system that corrects raw temperature readings from onboard sensors by determining a time and temperature relationship to apply a dynamic or static offset, accounting for the heat generated by internal components, ensuring accurate temperature measurements for efficient system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the HVAC device is turned on, then the device can control environmental conditions, but the internal components generate heat that causes inaccurate temperature measurements
Solution Approach 1:
The system performs preliminary characterization of the thermal relationship between device power state and temperature sensor readings. By pre-determining the time and temperature relationship (including offset values and thermal time constants) during manufacturing or initial operation, the system can compensate for self-generated heat without requiring complex real-time thermal modeling during operation.
Solution Approach 2:
The system dynamically adjusts the temperature measurement by applying time-dependent offset corrections based on the device's power state and pre-characterized thermal parameters. The correction amount changes over time as the device transitions between off and on states, using the predetermined thermal relationship to calculate accurate ambient temperature readings despite internal heat generation.
2Measurement precision
If the device remains off to avoid heat generation, then temperature measurements remain accurate, but the device cannot control environmental conditions
Solution Approach 1:
The system pre-characterizes the thermal behavior of the device during manufacturing or initial setup, storing time-temperature relationships and offset values that describe how internal components heat the sensor over time. This preliminary characterization enables accurate temperature compensation during subsequent operation without requiring the device to remain off.
Solution Approach 2:
The system continuously monitors the device's power state and uses the predetermined thermal relationship to calculate real-time temperature corrections. By feedbacking the power state information through the correction algorithm, the system maintains accurate temperature measurements dynamically as the device operates, resolving the contradiction between operation and measurement accuracy.
3Measurement precision
If temperature offset correction is applied dynamically based on time and power state, then measurement accuracy improves, but system complexity increases
Solution Approach 1:
The system performs the complex thermal characterization work in advance during manufacturing or initial setup, storing simplified lookup tables or mathematical parameters (offset values, time constants) that describe the thermal relationship. This shifts complexity from runtime operations to preliminary setup, making the operational correction process simple and efficient.
Solution Approach 2:
The device uses its own operational data (power state, elapsed time) and pre-stored thermal characteristics to automatically calculate and apply the appropriate temperature correction. The system serves itself by using its operational state information through the predetermined correction model, eliminating the need for external calibration or complex real-time thermal sensing infrastructure.
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 approach provides accurate temperature measurements, enabling the HVAC system to operate more efficiently and effectively control indoor environmental conditions by compensating for the heat generated by internal components.
Implementation Method 1
detecting a raw temperature with the sensor after (a)
Data Source
AI summary
Methods and related systems for measuring a temperature with an onboard sensor of a device of a heating, ventilation, and air conditioning (HVAC) system are disclosed. In an embodiment, the method includes (a) changing a power state of the device from off to on, and (b) detecting a raw temperature with the sensor after (a). In addition, the method includes (c) determining a time offset along a predetermined time and temperature relationship for the device, and (d) calculating a temperature offset with the predetermined time and temperature relationship at the time offset. Further, the method includes (e) subtracting the temperature offset from the raw temperature.