Vehicle Battery Charging Control via Dynamic Regeneration Restriction
Solution Overview
Problem
Existing vehicle control systems face challenges in adequately restricting charging electric power during regenerative braking, leading to potential battery overcharging or insufficient power recovery due to inadequate setting of permissible charging electric power values, which can result in battery protection issues and uncomfortable deceleration experiences for users.
Innovation Solution
A control apparatus and method that calculates a restriction target value for input electric current based on current sensor detection values, adjusts the regeneration restriction rate based on vehicle speed and charging electric power, and sets a coefficient to optimize the permissible charging electric power, ensuring the battery is protected while allowing sufficient regenerative power recovery without causing uncomfortable deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the permissible charging electric power value is set to a small value to protect the battery, then battery protection is improved, but regenerative electric power recovery is reduced
Solution Approach 1:
The patent applies dynamics by making the permissible charging electric power value changeable based on vehicle running conditions. The ECU adjusts the permissible value dynamically according to detected parameters such as battery state of charge, temperature, and vehicle speed, allowing optimal power recovery while protecting the battery under different operating conditions
Solution Approach 2:
The patent changes the parameter of permissible charging electric power value based on multiple detected conditions including battery state of charge, temperature, and vehicle running state. By adjusting this parameter according to real-time conditions, the system achieves both battery protection and sufficient regenerative power recovery
2Use of energy by moving object
If the permissible charging electric power value is set to a large value to maximize regenerative power recovery, then regenerative electric power recovery is improved, but battery protection is compromised
Solution Approach 1:
The patent implements feedback control where the ECU continuously monitors battery state (charge level, temperature) and vehicle running conditions, then adjusts the permissible charging electric power value accordingly. This closed-loop feedback mechanism ensures the battery is protected while maximizing regenerative power recovery under safe operating conditions
Solution Approach 2:
The system dynamically adjusts the permissible charging power based on real-time feedback from sensors monitoring battery state and vehicle conditions, transitioning from static to adaptive control to balance power recovery and battery protection
3Reliability
If feedback control is used to restrict input electric current, then battery protection is improved, but response time is delayed
Solution Approach 1:
The patent applies preliminary action by pre-calculating and setting the permissible charging electric power value based on predicted battery state and vehicle running conditions. The ECU proactively adjusts the permissible value before excessive charging occurs, rather than reacting after detection, thereby reducing the effective response delay
Solution Approach 2:
The system uses dynamic adjustment of the permissible charging power value that responds quickly to changing conditions, combining predictive elements with real-time monitoring to minimize response delay while maintaining battery protection
Data Source
AI summary
An electronic control unit is configured to: i) calculate a restriction target value of input electric current to a battery depending on detection value of a current sensor, in a charge control of charging the battery such that charging electric power to the battery is below a permissible value, ii) calculate voltage value of the battery when the battery is charged based on the restriction target value, in a case where the detection value exceeds the restriction target value, iii) calculate a basic permissible value of the charging electric power to the battery, from the restriction target value and the voltage value, and iv) set a regeneration restriction rate to a higher value, as a difference value between the restriction target value and the detection value increases, or as at least one of vehicle speed and the charging electric power when the detection value exceeds the restriction target value increases.