Battery Switching Diagnostics Under Zero-Current Conditions
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Solution Overview
Problem
Existing battery diagnostics systems are insufficient in accurately determining battery availability when current flow through the battery is approximately zero, making it difficult to assess the state of electromechanical switching devices, which can lead to safety risks in vehicle electrical systems.
Innovation Solution
An improved battery diagnostics system that includes a control system capable of determining the actual position of switching devices by evaluating current flow through a battery system, even when it is in a steady-state, by introducing a load to disrupt the equilibrium and measuring current changes, thereby enhancing the accuracy of battery availability assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known diagnostics are used to determine battery availability, then the system can operate with simple monitoring, but the accuracy of battery status detection deteriorates when current flow is approximately zero
Solution Approach 1:
The control system proactively introduces a load to the battery system before diagnostic evaluation, ensuring that current flow is established even when the battery would otherwise be in a steady-state with zero current. This preliminary action of load introduction enables accurate switching device position detection that would otherwise be impossible under zero current conditions.
Solution Approach 2:
The system changes the operational parameters of the battery system by introducing a controlled load, which alters the current flow conditions from zero to non-zero. This parameter change enables the diagnostic system to accurately determine electromechanical switching device positions by measuring current flow through the newly established load condition.
2Loss of energy
If the electromechanical switching device is in steady-state with zero current flow, then energy consumption is minimized, but the ability to detect switching device position deteriorates
Solution Approach 1:
The control system periodically introduces a load to the battery system at specific diagnostic intervals, creating temporary current flow conditions that enable switching device position detection. This periodic action balances energy conservation during normal operation with the need for accurate diagnostics, as the load is not continuously applied but only when diagnostic evaluation is required.
Solution Approach 2:
Before performing diagnostic evaluation of the switching device position, the control system preliminarily introduces a load to ensure current flow conditions are favorable for detection. This preliminary load introduction occurs only when needed for diagnostics, allowing the system to maintain low energy consumption during normal operation while enabling accurate detection when required.
3Stability of the object's composition
If no load is introduced to the battery system, then the system operates in a stable steady-state, but the accuracy of determining electromechanical switching device position deteriorates
Solution Approach 1:
The control system maintains stable steady-state operation by not continuously applying a load, but instead periodically introduces a load at diagnostic intervals. This periodic load introduction temporarily disrupts the steady-state to enable accurate switching device position measurement, after which the system returns to its stable steady-state operation, thus balancing stability with measurement accuracy.
Solution Approach 2:
The system dynamically transitions between steady-state operation and load-introduction modes based on diagnostic needs. During normal operation, the system maintains stable steady-state with no load. When diagnostic evaluation is required, the system dynamically introduces a load to create current flow conditions favorable for accurate switching device position detection, then returns to steady-state afterward.
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 system provides improved reliability and accuracy in determining battery availability, supporting safe operation of vehicles with advanced functionalities by accurately identifying the state of electromechanical switching devices, even under conditions where current flow is zero.
Implementation Method 1
determine an actual position of the switching device based at least in part on current flow through the battery
Data Source
AI summary
An electrical system having a battery system and a control system. The battery system may include a first switching device, a first battery electrically coupled in series with the first switching device, a second battery electrically coupled in parallel with the first switching device and the first battery when the first switching device is in a closed position, and a second switching device coupled in series with a load. The control system may perform diagnostics on the battery system.