Dual-Sensor Current Measurement for Vehicle Battery Accuracy
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Solution Overview
Problem
Current methods for measuring electric current in vehicles are prone to errors due to integration over time, leading to inaccurate state of charge calculations, which can result in false battery states and potential damage.
Innovation Solution
A device using two redundant current sensors with independent measuring principles, one based on a magnetic field and the other as a shunt, to provide precise and reliable current measurement, reducing errors and enhancing battery management systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single current sensor is used for current measurement, then the device complexity is reduced, but the measurement precision deteriorates due to integration errors over time
Solution Approach 1:
The current measurement function is segmented into two independent measurement channels, each with its own current sensor. The first current sensor measures current through the busbar, while the second current sensor measures current through the shunt, allowing error detection and correction through comparison of the two independent measurement paths
Solution Approach 2:
The system incorporates redundant current sensors and evaluation logic that continuously monitors measurement consistency. When deviations exceed a threshold, the system can switch to alternative measurement values or trigger diagnostic routines, cushioning against the impact of measurement errors before they lead to incorrect state of charge calculations
2Reliability
If current measurement is performed with a single sensor, then the device complexity is low, but the reliability deteriorates due to undetected measurement errors
Solution Approach 1:
The evaluation unit applies different evaluation rules to different measurement scenarios. It compares the first and second current sensor values and applies correction logic when deviations are detected, ensuring high reliability by treating measurement validation as a specialized function with dedicated error handling
Solution Approach 2:
The system continuously feeds back the comparison result between the two current sensor measurements to the evaluation unit. This feedback mechanism enables real-time detection of measurement deviations and triggers appropriate responses such as switching to alternative measurement values or initiating diagnostic routines
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 dual-sensor system significantly improves current measurement accuracy, enabling better energy management, preventing battery damage, and optimizing vehicle range by reducing errors in state of charge calculations.
Implementation Method 1
the first current sensor has a measuring principle which is independent of the second current sensor... the busbar comprises a conductor loop, in which the first current sensor detects the current to be measured on the basis of a magnetic measuring principle
Implementation Method 2
the second current sensor is designed as a shunt
Data Source
AI summary
The invention relates to a device for measuring an electric current between a vehicle battery and an electrical consumer connected to the vehicle battery. The claimed device includes a bus bar which picks up the electric current in the vehicle battery and guides it further to the electrical consumer, on which a first current sensor and a second current sensor which is different from the first current sensor are arranged, the current sensors being designed to measure, independently from each other, the electric current circulating in the bus bar.