EV Battery Charging Power Control With Compressor Cooling Margin
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Solution Overview
Problem
During external charging of a vehicle's power storage device, the combined power demand from the power storage device and the electric compressor can exceed permissible input power due to response delays in the external power supply, leading to potential overcharging.
Innovation Solution
A vehicle system that includes a cooling device and a control device to manage power transmission during external charging, setting the requested power to be lower than the sum of permissible input power and compressor power consumption, with a margin to account for response delays, and optionally stopping the compressor when conditions are met to prevent overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the requested power is set to the sum of permissible input power and electric compressor power consumption during external charging, then the charging efficiency is improved, but the input power may exceed permissible limits due to response delay
Solution Approach 1:
The control device applies preliminary anti-action by proactively reducing the requested power below the sum of permissible input power and compressor power consumption. This anticipatory reduction creates a safety buffer that counteracts the future harmful effect of power excess caused by response delay, preventing input power from exceeding permissible limits while maintaining efficient charging operation.
Solution Approach 2:
The control device performs preliminary action by calculating and setting the requested power in advance, accounting for the response delay period. By determining the appropriate power level before the delay occurs, the system ensures that even when the external power supply responds late, the input power remains within permissible limits, thus maintaining both charging efficiency and control accuracy.
2Reliability
If the electric compressor operates during external charging, then the cooling function is provided, but the total power consumption increases and may exceed permissible input power
Solution Approach 1:
The control device applies dynamics by continuously adjusting the requested power based on the operating state of the electric compressor. When the compressor operates, the requested power is dynamically set to account for its power consumption plus a margin. This dynamic adjustment ensures that the total power consumption remains within permissible limits while maintaining cooling function availability throughout the charging process.
Data Source
AI summary
The vehicle includes a power storage device, a cooling device, and a control device. The cooling device cools the power storage device together with driving of an electric compressor connected to the power line together with the power storage device. The control device transmits the required power to the external power supply device at the time of the external charging for charging the power storage device via the power line using the power from the external power supply device outside the vehicle. During the operation of the cooling device during the external charging, the control device transmits, to the external power supply device, power that is lower than the sum of the allowable input power of the power storage device and the power consumption of the electric compressor by a margin as the required power.