Vehicle Charging System Guard Target Control
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Solution Overview
Problem
Charging systems for vehicles face challenges in preventing overcurrent and breaker tripping during external charging, especially when abnormalities occur in the vehicle or charger systems.
Innovation Solution
A charging system with a charger and a charge control device that includes a power detection unit, target value determination, feedback control, and an upper limit guard processing unit to manage power supply and prevent overcurrent, utilizing a signal transmission device for allowable power information and an abnormality monitoring unit to manage charging safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charge power is increased to shorten charging time, then the charging speed is improved, but the risk of overcurrent and breaker tripping increases
Solution Approach 1:
The system determines a guard target value corresponding to the maximum allowable power of the charging path before charging begins. This preliminary power limit is established based on the allowable power information from the external power supply, preventing overcurrent conditions before they can occur during high-speed charging operations.
Solution Approach 2:
The charge control device performs feedback control by comparing the detected supply power with the guard target value, and adjusting the power command value to the charger accordingly. This continuous feedback mechanism ensures that charging power remains within safe limits while maximizing charging speed.
2Productivity
If the power command value is increased to supply more electric power, then the charging efficiency is improved, but the likelihood of system abnormality increases
Solution Approach 1:
The system applies preliminary anti-action by establishing a guard target value that acts as a protective constraint against excessive power commands. This pre-set power limit prevents the charging system from entering abnormal states by blocking potentially harmful high power commands before they can cause system stress or abnormalities.
3Reliability
If the charge control device limits power to prevent overcurrent, then the system safety is improved, but the charging time increases
Solution Approach 1:
The system dynamically adjusts the power command value to the charger based on real-time comparison between detected supply power and the guard target value. This dynamic control allows the system to operate at maximum safe power levels throughout charging, preventing both overcurrent conditions and unnecessary time loss from overly conservative power limiting.
Data Source
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AI summary
A charge control device includes a charge power detection unit (52) for detecting charge power supplied to a power storage device; a target value determination unit (51) for determining a target value of the charge power to the power storage device; a first feedback control unit (54) for correcting the target value based on the difference between the charge power and the target value to generate a power command value; a supply power detection unit (62) for detecting supply power output from the charger; a guard target value determination unit (61) for determining a guard target value corresponding to an upper limit value of the power command value based on allowable power of a system for charging; a second feedback control unit (64) for correcting the guard target value based on the difference between the supply power detected by the supply power detection unit (62) and the guard target value; and an upper limit guard processing unit (66) for limiting the target value corrected by the first feedback control unit based on the guard target value corrected by the second feedback control unit.