Voltage Anomaly Detection in High-Voltage Bus Systems
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Solution Overview
Problem
Diagnosing voltage anomalies in high-voltage bus systems of electrified vehicles is difficult and inaccurate using existing techniques, leading to inefficiencies in maintenance and troubleshooting.
Innovation Solution
A method and system that utilize voltage sensors to detect individual voltages, determine a baseline voltage, and compare them to identify anomalies, with a controller configured to alert operators and guide remedial actions, such as replacing cabling or components, to address voltage inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional voltage monitoring methods are used in high-voltage bus systems, then the system structure remains simple, but the accuracy of anomaly detection is insufficient
Solution Approach 1:
The patent divides the high-voltage bus system into multiple monitoring zones by placing voltage sensors at different locations (battery pack, DC-DC converter, junction box, motor controller). Each sensor independently monitors local voltage, enabling precise anomaly detection without requiring a single complex centralized system.
Solution Approach 2:
The controller performs multiple functions: it collects voltage data from all sensors, calculates baseline voltages, detects anomalies by comparing individual voltages to the baseline, and triggers alerts. This multi-functional approach improves detection accuracy without adding separate dedicated systems for each task.
2Reliability
If comprehensive voltage monitoring of all electrical components is implemented, then anomaly detection capability is improved, but the cost and complexity of the system increase
Solution Approach 1:
The system establishes a baseline voltage representing the equipotential state of the high-voltage bus system under normal conditions. By comparing individual component voltages against this common baseline, the system efficiently identifies deviations without requiring complex inter-component relationship modeling.
Solution Approach 2:
The controller continuously monitors voltage readings from all sensors, compares them to the baseline, and provides feedback through alerts when anomalies are detected. This closed-loop feedback mechanism improves maintenance reliability by enabling real-time detection and response to voltage deviations.
3Measurement precision
If baseline voltage is calculated using all available voltage readings, then the baseline represents the overall system state, but anomalous readings can skew the baseline calculation
Solution Approach 1:
The system performs preliminary filtering of voltage readings before baseline calculation by identifying and excluding outliers that fall outside acceptable ranges. This preliminary action ensures that the baseline voltage accurately represents normal system operation without being skewed by transient anomalies or sensor errors.
Data Source
AI summary
Methods and systems are provided for troubleshooting anomalies in a high-voltage bus system for an electrified vehicle are provided herein. The high-voltage bus system being electrically connected to a plurality of electrical components such that each electrical component in the plurality of electrical components has a similar voltage when the high-voltage bus system is electrified. The method includes detecting individual voltages for each electrical component in the plurality of electrical components using a voltage sensor of each of the electrical components in the plurality of electrical components; determining a baseline voltage for each of the electrical components in the plurality of electrical components, the baseline voltage corresponding to at least a subset of the individual voltages; and comparing any one of the individual voltages to the baseline voltage to determine if that individual voltage is anomalous.