Vehicle Charging Control Device for External Power Supply Duration Management
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Solution Overview
Problem
In vehicles equipped with motors and dual DC-DC converters, external charging of high voltage batteries is excessively prolonged when the external power supply is low, leading to insufficient charging due to temporary depletion of battery power.
Innovation Solution
A control device and method that includes an electronic control unit to manage the charging process, ensuring the power storage ratio of the high voltage battery reaches a target ratio or a predetermined time elapses, thereby ending charging and preventing excessive power feeding time from the external supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the charger continues external charging until the high voltage battery is fully charged, then the charging amount of the high voltage battery is maximized, but the power feeding time from the external power supply is excessively extended when electric power from the external power supply is small
Solution Approach 1:
The control device performs preliminary assessment of external power supply capacity before initiating full charging. When the external power supply capacity is determined to be small, the control device preemptively limits the charging duration to prevent excessive extension of power feeding time, while still securing sufficient charging amount through optimized charging control during the limited period.
2Duration of action of moving object
If the charger stops driving when the charged electric power of the high voltage battery becomes small, then the power feeding time is reduced, but the charging amount of the high voltage battery is not secured sufficiently
Solution Approach 1:
The control device continuously monitors multiple parameters including charged electric power of the high voltage battery, electric power from the external power supply, and elapsed charging time. Based on this real-time feedback, the control device dynamically adjusts charging control to maintain an optimal balance between charging amount and power feeding time, preventing both excessive time extension and insufficient charging.
Solution Approach 2:
The control device dynamically changes charging control strategy based on real-time system state. When external power supply capacity is small and charged electric power becomes low, the control device transitions from full charging mode to time-limited charging mode, optimizing the balance between charging amount and power feeding time according to current conditions.
3Power
If the charger operates with two DC-DC converters supplying large electric power to the low voltage system, then the low voltage system power demand is met, but the charged electric power of the high voltage battery temporarily becomes small or negative
Solution Approach 1:
The control device acts as an intermediary that coordinates between the charger, high voltage battery, and low voltage system. When the low voltage system requires large electric power, the control device manages the interaction between the two DC-DC converters and the charger, ensuring that the high voltage battery is not over-discharged while still meeting the low voltage system power demand through optimized power distribution.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach ensures the charging amount of the high voltage battery is secured by limiting the external charging time and maintaining the power storage ratio, preventing temporary depletion and ensuring efficient charging.
Implementation Method 1
a first DC-DC converter connected to the high voltage system power line and the low voltage system power line, the first DC-DC converter configured to decrease a voltage of the high voltage system power line and to supply the electric power of the high voltage system power line to the low voltage system power line
Implementation Method 2
a charger connected to the high voltage system power line, the charger being configured to charge the high voltage battery using electric power from an external power supply
Data Source
AI summary
In a low power charging mode, when a predetermined time has elapsed from the start of external charging, the external charging ends. With this, it is possible to suppress excessive extension of a power feeding time from an external power supply, and to secure a charging amount of a high voltage battery at least to some extent.