Current Sensor Offset Diagnosis for Eco-Friendly Vehicle Batteries
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Solution Overview
Problem
Current sensor systems in eco-friendly vehicles face challenges in accurately measuring offset currents, leading to potential errors when the ignition is turned off or on, which can result in incorrect current calculations due to sensor faults or abnormalities.
Innovation Solution
An apparatus and method that involve measuring offset currents at multiple preset times when the ignition is turned off and on, using a controller to determine sensor faults by comparing these measurements to a reference value, and adjusting the offset current accordingly to ensure accurate current calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offset current is measured only when ignition is turned off, then measurement process is simple, but sensor fault cannot be detected when ignition is turned on
Solution Approach 1:
The offset current measurement process is segmented into two distinct phases: measurement when ignition is turned off and measurement when ignition is turned on. This segmentation allows independent analysis of sensor behavior in different states, enabling fault detection that would be impossible in a single-phase measurement approach.
Solution Approach 2:
The system performs preliminary offset current measurements both before (ignition off) and after (ignition on) the ignition event. These preliminary measurements establish baseline values that can be compared to detect abnormal drift or faults in the sensor's offset current characteristics.
2Measurement precision
If offset current is measured multiple times and averaged, then measurement precision improves, but measurement time increases
Solution Approach 1:
The system performs preliminary offset current measurements at specific ignition events (turning off and turning on) rather than continuously measuring and averaging over extended periods. This preliminary action approach achieves sufficient measurement precision at critical moments without the time penalty of continuous averaging.
3Ease of operation
If Hall effect current sensor is used to measure large current, then non-contact measurement is achieved, but offset current drifts under 0A condition
Solution Approach 1:
The system measures offset current at multiple points (ignition off and ignition on) and uses feedback comparison to detect and compensate for drift. By comparing offset measurements taken at different ignition states, the system identifies abnormal drift patterns and can trigger diagnostic routines to correct or alert about sensor inaccuracies.
Solution Approach 2:
The system changes the measurement parameter by taking offset current measurements under different ignition conditions (off and on). This parameter change approach allows the system to detect whether the sensor's offset drift is within acceptable ranges or indicates a fault, thereby maintaining measurement precision despite the inherent drift characteristic of Hall effect sensors.
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 allows for accurate diagnosis of current sensor failures and ensures precise current measurement by using valid offset currents, reducing erroneous calculations and improving sensor reliability.
Implementation Method 1
A Hall effect sensor or a Hall sensor, which measures a magnetic field induced by a current to measure the current
Data Source
AI summary
Provided are apparatuses and methods for diagnosing failure of a current sensor of a battery system for an eco-friendly vehicle. One apparatus for diagnosing failure of a current sensor of a battery system for an eco-friendly vehicle includes a high voltage battery, a current sensor configured to measure a current output from the high voltage battery, and a controller configured to measure an offset current through the current sensor when an ignition key is turned off or turned on, and diagnose failure of the current sensor on the basis of the measured offset current.