Electric Vehicle Auxiliary Battery Charging Control
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Solution Overview
Problem
Conventional charging control methods for electric vehicle auxiliary batteries do not effectively manage charging when the battery voltage is sufficiently high, leading to reduced fuel efficiency.
Innovation Solution
A charging control method that monitors the state of charge (SOC), temperature, and charging current of the auxiliary battery, determining and adjusting charging modes between a charging-oriented mode and a low-voltage mode based on SOC criteria, and setting charging voltage using map data incorporating SOC and temperature as inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary battery is continuously charged regardless of SOC level, then the battery voltage is maintained at a sufficient level, but the fuel efficiency deteriorates due to unnecessary charging
Solution Approach 1:
The patent applies parameter changes by adjusting the charging voltage based on the SOC level. When SOC is high (above threshold), the charging voltage is reduced or charging is stopped. When SOC is low (below threshold), normal charging voltage is applied. This dynamic parameter adjustment resolves the contradiction by eliminating unnecessary charging when the battery is already sufficiently charged, thereby improving fuel efficiency while maintaining reliable voltage levels.
2Productivity
If the charging voltage is increased to charge the auxiliary battery faster, then the charging time is reduced, but the battery temperature increases which may cause overheating
Solution Approach 1:
The patent applies dynamics by making the charging voltage adjustable and adaptive rather than fixed. The charging voltage is dynamically adjusted based on real-time monitoring of battery temperature and SOC levels. When temperature rises, the charging voltage is automatically reduced to prevent overheating. This dynamic control enables fast charging when conditions permit while preventing thermal runaway, thus resolving the contradiction between charging speed and temperature control.
3Ease of operation
If the charging control strategy is simplified to always charge when voltage is low, then the control system is easy to implement, but the charging efficiency is reduced due to lack of optimization
Solution Approach 1:
The patent applies parameter changes by introducing multiple charging voltage levels (first charging voltage for normal charging, second charging voltage for fast charging) and transitioning between them based on SOC thresholds. This provides optimized charging efficiency through parameter adjustment while maintaining relatively simple control logic based on threshold comparisons, thus resolving the contradiction between implementation simplicity and charging efficiency.
Data Source
AI summary
A charging control method and system for an electric vehicle are provided. The charging control method includes monitoring, by a controller, a state of an auxiliary battery including a state of charge (SOC), temperature, and charging current of the auxiliary battery. A charging mode of the electric vehicle is then determined based on the monitored state of the auxiliary battery. A charging voltage of the auxiliary battery is set based on the monitored SOC and temperature of the auxiliary battery and then the auxiliary battery is charged with the set charging voltage.