Vehicle Sub-Battery Voltage Equalization Control
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Solution Overview
Problem
Conventional vehicle power supply systems face issues with high current flow when connecting a sub-battery with lower internal resistance to a power supply circuit connected to a main battery, leading to potential deterioration of the sub-battery and relay components, and increased costs due to the need for high-current protection measures.
Innovation Solution
The method involves adjusting the voltage of the power supply circuit to match that of the sub-battery before connecting it, using a controller to regulate the power generation voltage of an electric generator to equalize the voltages, thereby suppressing high current flow by ensuring the sub-battery is connected only when the voltage difference is within a tolerable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sub-battery is connected to the power supply circuit without voltage adjustment, then the connection process is simple and fast, but a high current flows causing sub-battery deterioration and relay damage
Solution Approach 1:
The voltage adjustment is performed before connecting the sub-battery to the power supply circuit. The controller regulates the power generation voltage of the electric generator to equalize the voltage between the power supply circuit and the sub-battery, and only after this voltage equalization is complete does the controller connect the sub-battery. This preliminary voltage adjustment prevents high current flow and sub-battery deterioration while maintaining a relatively simple overall system structure.
2Object-affected harmful factors
If the power generation voltage is controlled to match the sub-battery voltage, then high current flow is suppressed, but the voltage control process becomes more complex
Solution Approach 1:
The electric generator acts as an intermediary device between the power supply circuit and the sub-battery. The controller regulates the power generation voltage of the generator to equalize the voltage difference before connection, thereby suppressing high current flow. This intermediary approach effectively reduces harmful high current effects while using existing generator control capabilities rather than adding complex dedicated voltage control equipment.
3Manufacturing precision
If the main battery is disconnected before connecting the sub-battery, then voltage equalization is easier, but the power supply process takes longer
Solution Approach 1:
The controller first disconnects the main battery from the power supply circuit, then regulates the power generation voltage of the electric generator to equalize the voltage with the sub-battery before connecting them. This preliminary disconnection and voltage equalization sequence achieves more accurate voltage matching, preventing high current flow and sub-battery deterioration, though it does extend the overall battery switching time.
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 effectively reduces the risk of high current flow, inhibits sub-battery deterioration, and moderates the performance requirements for high-current protection, resulting in a low-cost and reliable system that prevents transient issues like voltage fluctuations affecting electrical equipment.
Implementation Method 1
controlling the power generation voltage of an electric generator connected to the power supply circuit
Implementation Method 2
a sub-battery having an internal resistance lower than that of a main battery is connected to a power supply circuit connected to the main battery
Data Source
AI summary
A sub-battery (33) having an internal resistance lower than that of a main battery (32) is connected to a power supply circuit (31) connected to the main battery (32). In this case, the sub-battery (33) is connected to the power supply circuit (31) after the voltage ECKT of the power supply circuit (31) is adjusted to the voltage ESub of the sub-battery (33) by controlling the power generation voltage EALT of an alternator (24) connected to the power supply circuit (31).