Vehicle Charge Control Method for Auxiliary Battery Voltage Stability
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Solution Overview
Problem
Eco-friendly vehicles face challenges in charging high voltage batteries while in the IG ON operational state or EV READY mode, leading to voltage drops and start-up limitations due to continuous electric field loads, and existing discharge protection methods are inadequate for these conditions.
Innovation Solution
A charge control method that verifies the connection of a battery charging connector, monitors second battery voltage, and adjusts vehicle states to allow charging in IG ON or EV READY modes, ensuring stable battery charging and preventing voltage reductions by maintaining the IG ON state after charging, and determining vehicle speed to prevent movement during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle charges the high voltage battery in IG ON operational state, then charging convenience is improved, but auxiliary battery voltage drops due to continuous electric field load
Solution Approach 1:
The system performs preliminary monitoring of auxiliary battery voltage before and during charging operations. When voltage drops below a predetermined threshold, the system proactively interrupts charging or switches to IG OFF state to prevent complete voltage depletion, thereby maintaining reliability while enabling convenient charging operation.
Solution Approach 2:
The control unit continuously monitors auxiliary battery voltage and uses this feedback to dynamically adjust charging operations. When voltage drops are detected, the system automatically interrupts charging or changes vehicle state, creating a closed-loop control that balances charging convenience with voltage stability maintenance.
2Ease of operation
If the vehicle charges the high voltage battery in EV READY mode, then charging accessibility is improved, but vehicle movement safety is compromised
Solution Approach 1:
Before allowing charging in EV READY mode, the system performs preliminary checks to ensure vehicle speed is below a predetermined threshold. This preliminary verification prevents charging operations from commencing when the vehicle is in motion, thereby maintaining safety while preserving charging accessibility when stationary.
Solution Approach 2:
The system continuously monitors vehicle speed during charging operations and uses this feedback to maintain EV READY mode only when speed remains below the threshold. This real-time monitoring and dynamic state maintenance ensures safety compliance while allowing flexible charging operation when conditions are appropriate.
3Reliability
If the vehicle maintains IG OFF operational state to charge the high voltage battery, then auxiliary battery voltage stability is improved, but charging convenience is reduced
Solution Approach 1:
The system dynamically switches between IG ON and IG OFF states based on real-time auxiliary battery voltage conditions. When voltage is sufficient, the system operates in IG ON mode for convenient charging. When voltage drops below thresholds, it transitions to IG OFF mode to maintain stability, creating an adaptive charging system that balances both convenience and reliability.
Solution Approach 2:
The system changes the operational parameter (ignition state) based on auxiliary battery voltage levels. By monitoring voltage and switching between IG ON and IG OFF states, the system adapts charging operations to maintain voltage stability while maximizing charging convenience when conditions permit.
4Productivity
If the vehicle allows continuous charging operations, then charging efficiency is improved, but battery discharge protection is compromised
Solution Approach 1:
The system implements periodic monitoring of auxiliary battery voltage during charging operations and interrupts charging when voltage drops below predetermined thresholds. This periodic check-and-interrupt approach allows efficient continuous charging while maintaining discharge protection, creating a rhythm of charge-interrupt-charge that balances productivity and reliability.
Solution Approach 2:
The control unit uses feedback from continuous voltage monitoring to dynamically control charging operations. When voltage remains above thresholds, charging proceeds efficiently. When voltage drops, charging is interrupted to provide discharge protection, creating a self-regulating system that balances charging efficiency with battery protection.
Data Source
AI summary
A charge control method for a vehicle is provided which includes charging a first battery when the vehicle is in an IG ON operational state, maintaining the IG ON operational state and monitoring a second battery voltage. The charge control method further includes charging a second battery, calculating a vehicle speed when the vehicle is in an EV READY state and adjusting the EV READY state of the vehicle to the IG ON operational state when the calculated vehicle speed is less than a predetermined speed.