Motor Vehicle Power Supply Network Voltage Balancing
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Solution Overview
Problem
Existing on-board network structures in motor vehicles often experience power shortages during high-voltage battery charging due to insufficient power delivery to low-voltage networks, leading to overheating of high-voltage batteries due to inadequate cooling.
Innovation Solution
A method where control devices in both high-voltage and low-voltage networks communicate to balance power requirements, reducing power to low-voltage network components if necessary, and reallocating this power to critical high-voltage components like cooling devices, ensuring sufficient power for battery charging and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If power is delivered from high-voltage network to low-voltage network during high-voltage battery charging, then low-voltage network components can operate, but high-voltage battery overheating occurs due to insufficient power for cooling
Solution Approach 1:
The system dynamically adjusts the power distribution between low-voltage and high-voltage networks based on real-time power availability and cooling requirements. The control device monitors the power balance and dynamically switches between different power delivery modes to ensure adequate cooling power while maintaining low-voltage network operation.
Solution Approach 2:
The system changes the power delivery parameters (voltage, current) from the high-voltage network to the low-voltage network based on the detected power balance. When power is sufficient, normal power delivery is maintained; when power is insufficient, the parameters are adjusted to prioritize cooling requirements.
2Reliability
If power is reduced in low-voltage network to compensate for high-voltage network power shortage, then high-voltage battery cooling is ensured, but comfort features for vehicle occupants are impacted
Solution Approach 1:
The control device continuously monitors the power balance in the high-voltage network and provides feedback to adjust power delivery to the low-voltage network. This closed-loop control ensures that cooling requirements are met while minimizing impact on comfort features by only reducing power when absolutely necessary.
Solution Approach 2:
The control device acts as an intermediary between the high-voltage and low-voltage networks, mediating power distribution to balance cooling requirements with comfort feature operation. It intelligently determines which low-voltage components should receive reduced power while maintaining critical functions.
3Productivity
If high-voltage network supplies sufficient power to low-voltage network, then all network components can operate, but power balance is exceeded and cooling power becomes insufficient
Solution Approach 1:
The system performs preliminary assessment of the power balance before delivering power from the high-voltage network to the low-voltage network. The control device calculates the available power for cooling in advance and adjusts power delivery accordingly to prevent power balance exceedance and ensure adequate cooling power is always available.
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating an onboard power supply system of a motor vehicle, said onboard power supply system having at least two electric networks with different supply voltages. A high-voltage network for supplying power to at least one low-voltage network with a lower supply voltage compared to the high-voltage network outputs a specified power quantity to the at least one low-voltage network. At least one network component, in particular an electric load, is connected to each network, and the high-voltage network has at least one high-voltage battery that is connected to said network. The power of at least one of the at least one network component connected in the at least one low-voltage network and the power quantity of at least one of the at least one network component, said power quantity being outputted by the high-voltage network to the at least one low-voltage network, are reduced in the event of a power loss that occurs in the high-voltage network during the charging process of the high-voltage battery.