Correction Parameter Determination for Temperature-Dependent Electrical Properties
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Solution Overview
Problem
Existing methods for determining temperature-dependent properties of electrical components, such as resistance values, in traction networks of electric vehicles are inaccurate and costly due to the high precision required for resistance elements, which are difficult to obtain and calibrate effectively.
Innovation Solution
A method and device that determine correction parameters for temperature-dependent properties of electrical components by measuring their properties at multiple temperatures during the production process, allowing for precise calibration and integration into existing production processes, including a two-point calibration approach using sensors and computational determinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistance elements with tight tolerances (0.1%) are used for high-voltage direct current measurement, then measurement precision is improved, but manufacturing cost increases and availability decreases
Solution Approach 1:
The patent applies parameter changes by measuring the resistance value at multiple temperatures (temperature parameter change) and determining correction parameters that compensate for temperature-dependent resistance variations. This allows the use of resistance elements with relaxed tolerances (e.g., 1%) while achieving the measurement precision that would otherwise require expensive 0.1% tolerance components. The correction parameters are stored and applied during operation to maintain accuracy across the temperature range.
2Measurement precision
If resistance elements with tight tolerances are used, then measurement precision is improved, but device complexity and difficulty of obtaining components increases
Solution Approach 1:
The patent measures resistance at multiple temperatures to capture temperature-dependent parameter changes. This approach replaces the need for expensive, tightly-toleranced components with a measurement and correction system that achieves equivalent or superior precision using readily available, lower-cost resistance elements.
Solution Approach 2:
The patent performs preliminary measurement action by determining the resistance value at multiple temperatures during production or calibration. This preliminary characterization allows correction parameters to be determined in advance and stored for later use, simplifying the operational measurement process while maintaining high precision.
3Ease of manufacture
If single-point calibration is performed during end-of-line testing, then ease of manufacture is improved, but measurement precision deteriorates
Solution Approach 1:
The patent segments the calibration process into multiple temperature points instead of using a single-point calibration. By measuring at multiple temperatures (e.g., ambient temperature and elevated temperature), the method captures temperature-dependent variations and determines correction parameters that improve precision across the operating temperature range while maintaining ease of manufacture through automated production integration.
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
Enables accurate and cost-effective determination of temperature-specific properties, improving the measurement of high-voltage direct voltage, phase currents, and rotor voltage in electric vehicles, leading to enhanced operational performance.
Implementation Method 1
a temperature of the first electrical component is changed to a first production temperature
Implementation Method 2
determining the at least one property of the first electrical component after reaching the first production temperature as a first temperature-specific property
Data Source
Figure 1~2
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AI summary
The invention relates to a method and a device for determining at least one correction parameter (P, P1) for at least one temperature-dependent property of at least one first electrical component (B1) which is installed in a multi-step production process of a product, wherein in at least one first production step of the production process the temperature of the first electrical component (B1) is changed to a first production temperature, comprising at least: - determining the at least one property of the first electrical component (B1) after reaching the first production temperature as the first temperature-specific property (ET1, B1_ET1) of the first electrical component (B1), - determining the at least one property of the first electrical component (B1) at at least one further production temperature, which differs from the first production temperature, as a further temperature-specific property (ETW,B1_ETW) of the first electrical component (B1), determining the at least one correction parameter (P, P1) as a function of the temperature-specific properties (ET1, B1_ET1, ETW, B1_ETW) of the first electrical component (B1).,