Synchronized HV Battery Controller Timing to Prevent Dark Current
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Solution Overview
Problem
Commercial vehicles with multiple high-voltage battery packs face monitoring errors due to internal timer deviations, leading to increased dark current and risk of vehicle discharge, as controllers fail to enter a standby state synchronously.
Innovation Solution
A high-voltage battery control apparatus with multiple controllers that synchronize their monitoring operations, where a primary controller waits for all others to complete their monitoring before transitioning to an end state, ensuring continuous monitoring and preventing excessive dark current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each controller independently counts time by its own RTC to perform monitoring operations, then each controller can operate autonomously, but the controllers fail to enter standby state synchronously due to RTC quality deviation, increasing dark current
Solution Approach 1:
The patent introduces a master controller as an intermediary that coordinates the monitoring operations of all slave controllers. The master controller generates a start signal that synchronizes the monitoring start time across all controllers, and generates an end signal that synchronizes their transition to standby state. This mediator approach resolves the timing synchronization problem caused by independent RTC operations while maintaining autonomous operation capability.
Solution Approach 2:
The patent merges the timing control functions of multiple independent controllers into a unified control scheme where the master controller manages the monitoring schedule for all slave controllers. By combining the start and end timing decisions at the master controller level, the system ensures all controllers enter and exit monitoring mode simultaneously, eliminating the dark current issue caused by asynchronous operations.
2Reliability
If multiple controllers monitor multiple battery packs simultaneously, then comprehensive monitoring coverage is achieved, but the complexity of coordinating monitoring operations increases
Solution Approach 1:
The patent segments the monitoring system into a master controller that handles coordination logic and multiple slave controllers that execute monitoring tasks. This segmentation divides the complex coordination problem into manageable parts: the master controller manages timing synchronization and signal distribution, while slave controllers focus on executing monitoring operations and reporting status. This reduces overall system complexity by separating control functions.
Solution Approach 2:
The master controller serves multiple functions: it acts as a timing source for all slave controllers, a coordinator for monitoring schedules, and a central point for synchronization signals. This multi-functionality consolidates coordination complexity into a single component, allowing slave controllers to remain simpler while achieving comprehensive monitoring coverage across all battery packs.
3Productivity
If controllers wake up at different times due to RTC deviation, then individual monitoring can proceed without waiting, but the dark current increases and 24V battery discharge risk increases
Solution Approach 1:
The master controller performs preliminary actions by pre-calculating and distributing the monitoring start time to all slave controllers before they begin monitoring. All controllers are instructed to wake up and start monitoring simultaneously based on the master's timing, preventing the energy waste of asynchronous operations while maintaining efficient monitoring productivity.
Solution Approach 2:
The system implements feedback mechanisms where slave controllers report their status to the master controller, and the master controller adjusts timing signals to ensure synchronized operation. This feedback loop ensures that all controllers remain synchronized throughout the monitoring cycle, preventing dark current issues while maintaining efficient monitoring operations.
Data Source
AI summary
A high-voltage battery control apparatus includes a plurality of high-voltage battery controllers configured to respectively monitor states of a plurality of high-voltage batteries included in one high-voltage battery pack depending on a predetermined period for monitoring the high-voltage battery pack, wherein the high-voltage battery controllers are configured to transition state of the plurality of high-voltage battery controllers together to an end state when a high-voltage battery controller among the high-voltage battery controllers, which has completed a monitoring operation, first waits until all monitoring operations of the high-voltage battery controllers that have not yet completed monitoring operations are completed and then all the monitoring operations of the high-voltage battery controllers are completed.