Motor Neutral-Point Charging Control for Electrified Vehicles
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Solution Overview
Problem
Electrified vehicles require a long charging time compared to internal combustion engine vehicles, and the maximum traveling distance is limited by battery voltage and capacity variations, leading to potential power performance degradation.
Innovation Solution
Incorporating a motor system with an inverter and a controller to utilize an auxiliary battery for charging the main battery during driving, applying a DC offset to phase currents through a charging switch and switching signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery voltage is increased to improve power output, then the motor system can produce maximum available output, but the withstanding voltage design becomes more complex and limited
Solution Approach 1:
The patent employs dynamic voltage management by switching between series and parallel battery configurations based on operating conditions. The battery system can dynamically reconfigure its internal connections to provide high voltage for motor output when needed, while maintaining design feasibility through controlled switching operations rather than permanent high-voltage design
Solution Approach 2:
The patent changes the electrical configuration parameters of the battery system by switching between series connection (for high voltage) and parallel connection (for high current). This allows the system to adjust its voltage and current characteristics dynamically, achieving maximum motor output without requiring the motor system to be permanently designed for withstanding maximum voltage
2Quantity of substance
If the battery capacity is increased to extend traveling distance, then the maximum traveling distance improves, but the charging time increases significantly
Solution Approach 1:
The patent divides the battery system into multiple modules or cells that can be independently managed. By segmenting the battery capacity into manageable units, the system can charge and discharge different segments at different rates, effectively increasing total capacity while maintaining reasonable charging times through parallel charging paths
Solution Approach 2:
The patent implements dynamic battery management where the system can switch between series and parallel configurations during operation. This dynamic reconfiguration allows the system to optimize charging speed by switching to parallel mode during charging, thereby extending traveling distance without proportionally increasing charging time
3Power
If the battery voltage is increased to improve power performance, then the motor output increases, but the voltage must be kept within design standards to avoid system limitations
Solution Approach 1:
The patent uses dynamic switching between series and parallel battery configurations to temporarily exceed standard voltage levels when high power output is needed, while returning to standard voltage configurations during normal operation. This allows the system to achieve improved power performance while maintaining compliance with voltage design standards through controlled, temporary deviations
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
Enhances the traveling distance of electrified vehicles by efficiently charging the main battery using the auxiliary battery during operation, minimizing power loss and maintaining motor performance.
Implementation Method 1
charging a main battery with an auxiliary battery through a motor system while driving
Implementation Method 2
an electrified vehicle including a motor system and a controller, the motor system comprising a motor including a plurality of windings corresponding to each of phases; an inverter including a DC terminal connected to a main battery
Data Source
AI summary
An electrified vehicle includes a motor including a plurality of windings corresponding to each of phases; an inverter including a DC terminal connected to a main battery, and a plurality of legs connected to each end of the windings; a charging switch connected between one electrode of an auxiliary battery and a neutral terminal of the motor; and a controller configured to turn on the charging switch and to apply a DC offset to each of phase currents of the motor having the phases when the charging mode is performed while driving.