Electric Power Storage Control Device for Vehicle
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Solution Overview
Problem
Existing control systems for electric power storage devices in vehicles face challenges in managing charging and discharging electric power effectively, leading to potential overcharging or overdischarging due to significant gaps between command and actual power levels, which can disrupt the balance and cause deterioration of the storage device.
Innovation Solution
A control device with a limit value setting unit, target setting unit, correction unit, and command setting unit that adjusts the charging/discharging electric power limits based on the state of the electric power storage device and load device, incorporating temperature considerations and actual power input/output differences to set a corrected command value, thereby managing the balance between charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging/discharging command value is set based on temperature-based upper limit values, then the electric power storage device can be protected from overcharging and overdischarging, but a significant gap between command value and actual charging/discharging electric power may disrupt the balance between charging and discharging
Solution Approach 1:
The control device calculates the actual charging electric power and actual discharging electric power, then uses these feedback values to dynamically adjust the charging upper limit value and discharging upper limit value. The correction amount is determined by the difference between target and actual values, creating a closed-loop control system that maintains balance while ensuring protection.
Solution Approach 2:
The upper limit values for charging and discharging are made dynamic rather than fixed. The charging upper limit value and discharging upper limit value are continuously adjusted based on the calculated actual electric power values, allowing the system to adapt to changing conditions and maintain optimal balance between charging and discharging operations.
2Ease of operation
If the charging upper limit value and discharging upper limit value are set based on temperature, then appropriate management is achieved, but the system does not account for actual charging/discharging electric power differences
Solution Approach 1:
The system incorporates feedback from actual electric power measurements to refine the temperature-based upper limit settings. The correction unit uses the difference between target and actual electric power to adjust the limit values, combining temperature-based preliminary management with real-time power-based precision adjustment.
Solution Approach 2:
The control device changes the parameters used for setting upper limit values from solely temperature-based to a combination of temperature-based and actual power-based parameters. This allows the system to maintain the simplicity of temperature-based management while adding the precision of actual electric power measurements through dynamic parameter adjustment.
Data Source
AI summary
A control device controls charging/discharging of an electric power storage device for supplying electric power to a load device. The control device includes: a limit value setting unit setting a limit value of charging electric power for the electric power storage device based on the state of the electric power storage device; a target setting unit setting a target value of the charging electric power based on the state of the load device and the limit value; a correction unit correcting the limit value based on a difference between the target value and the actual electric power input to and output from the electric power storage device; and a command setting unit setting a command value of the charging electric power based on the state of the load device and the corrected limit value.