Vehicle Battery Charging Voltage Measurement Drift Correction
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Solution Overview
Problem
High-voltage vehicle batteries require precise voltage measurements during charging to ensure safety and efficiency, but existing technologies face challenges in maintaining measurement accuracy over time due to small permitted voltage differences and potential measurement errors.
Innovation Solution
A method and charging arrangement that adjust the measuring devices during each charging process to match the voltage measurements on both sides of the switch arrangement, using a correction factor integrated into software, and optionally employing a DC/DC converter with additional measuring devices to maintain high measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high measurement accuracy is required for voltage measurements during charging, then measurement precision is improved, but device complexity increases due to the need for multiple measuring devices and adjustment mechanisms
Solution Approach 1:
The patent implements a feedback mechanism where the control device receives measurement results from both measuring devices, compares them, and automatically adjusts one measuring device based on the other's readings. This closed-loop feedback system maintains measurement accuracy without requiring complex manual calibration procedures.
Solution Approach 2:
The measuring devices perform self-adjustment during the charging process. The control device automatically selects which measuring device to adjust based on operational state, and the adjustment is performed autonomously without external intervention, making the system self-maintaining.
2Reliability
If voltage measurements are taken on both sides of the switch arrangement, then measurement reliability is improved, but device complexity increases due to requiring multiple measuring devices
Solution Approach 1:
The patent divides the measurement function into two separate measuring devices positioned on opposite sides of the switch arrangement. This segmentation allows independent measurement and adjustment of each device, improving reliability through redundancy while managing complexity through modular design.
Solution Approach 2:
The control device merges the functions of multiple measuring devices by coordinating their operations. It selects which device to trust based on operational state, adjusts them relative to each other, and integrates their readings into a unified measurement system, effectively combining multiple devices into a single coordinated measurement solution.
3Measurement precision
If measuring devices are adjusted during each charging process, then measurement precision is maintained over time, but productivity decreases due to additional adjustment steps
Solution Approach 1:
The adjustment of measuring devices occurs periodically at predetermined intervals during charging processes rather than continuously. The control device determines optimal adjustment moments based on operational state, performing adjustments only when necessary to maintain accuracy without constantly interrupting the charging process.
Solution Approach 2:
The system performs preliminary adjustments during idle periods or at the beginning of charging processes when conditions are favorable. By preparing and adjusting measuring devices in advance during appropriate moments, the system maintains accuracy without causing delays during critical charging phases.
Data Source
AI summary
A method for charging a vehicle battery which stores electrical power for an electrical drive motor of a vehicle, wherein the vehicle battery is electrically connectable to a charging socket via a switch arrangement. The method includes: measuring a first electrical variable on the switch arrangement side facing the charging socket, by a first measuring device, measuring a second electrical variable on the switch arrangement side facing the vehicle battery, by a second measuring device, comparing the first and second electrical variables and closing the switch arrangement, if the first and second electrical variables substantially correspond, measuring the first and second electrical variables while the switch arrangement is closed, and adjusting the first measuring device and the second measuring device on the basis of a first measurement difference between measurement results of the first and second electrical variables while the switch arrangement is closed.