Vehicle Battery Series Parallel Switching Control
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Solution Overview
Problem
Existing electric vehicle power supply systems require significant modifications when changes or additions are made to vehicle devices, as they rely on predetermined rules based on motor, generator, and battery conditions, making it difficult to adapt without large-scale changes.
Innovation Solution
A power supply control apparatus and method that allows switching between series and parallel battery connection modes based on requirements from various devices, using a series/parallel switching portion and determination portion to prioritize connection modes based on device and system conditions, ensuring efficient energy use and adaptability to changes in vehicle configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a predetermined rule-based control system is used for battery connection mode switching, then the control logic is simple and easy to implement, but the system requires significant modifications when vehicle devices are changed or added
Solution Approach 1:
The control system is segmented into multiple independent requiring portions, each responsible for a specific device or battery. Each requiring portion independently evaluates its own requirements and outputs them to the determination portion, allowing individual modules to be modified or added without affecting the entire system structure.
Solution Approach 2:
The determination portion uses a universal counting mechanism that works regardless of the number or type of requiring portions. By counting the number of series requirements versus parallel requirements from any number of devices, the system provides a flexible framework that adapts to different vehicle configurations without requiring fundamental changes to the control logic.
2Power
If the battery connection mode is switched from parallel to series, then the driving voltage increases to ensure motor performance, but the DC-DC converter switching loss increases
Solution Approach 1:
The system performs preliminary voltage equalization through the DC-DC converter before switching from parallel to series connection. By equalizing the voltages of the first and second batteries in advance, the system minimizes the voltage difference at the moment of switching, thereby reducing switching losses in the DC-DC converter while ensuring the motor receives the required driving voltage.
Solution Approach 2:
The control system continuously monitors the voltage levels of both batteries and uses this feedback to control the DC-DC converter's operation. The converter operates to equalize voltages based on real-time feedback, and this feedback mechanism ensures that switching occurs at the optimal moment, minimizing energy losses while achieving the desired voltage increase for motor performance.
Data Source
AI summary
A power supply control apparatus for a vehicle having a battery portion having a plurality of batteries of which a connection mode is switched to a series mode or a parallel mode, a device which can give or be given electric power to or from the battery portion, and a switching portion which switches the connection mode of the batteries to a series mode or a parallel mode has requiring portions which output respective requirements of the battery portion and the device in relation to the connection mode of the batteries based on respective conditions of the battery portion and the device, a determination portion which determines which of a series requirement and a parallel requirement is greater in number, and a determination.