Predictive Energy Management for Dual-Energy Storage Systems
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Solution Overview
Problem
Modern motor vehicles with complex electrical systems, particularly hybrid vehicles, require advanced energy management to balance energy flows effectively, as existing systems struggle to optimize the lifespan and efficiency of energy storage devices under varying usage profiles.
Innovation Solution
A predictive energy management system that adjusts the base voltage of a dual-energy storage system comprising a lead-acid battery and a lithium-ion battery, connected in parallel, based on predicted charge balances, navigation data, traffic information, and vehicle usage patterns, to optimize the cycling of each energy storage device and maintain recuperation potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a dual-energy storage system is used to meet increasing energy requirements, then energy supply capacity is improved, but system complexity and difficulty of energy management increase
Solution Approach 1:
The energy storage system is segmented into two distinct units with different characteristics (lead-acid battery for high power/cycle resistance and lithium-ion battery for high energy density). Each unit handles specific energy management tasks, dividing the complex function of energy storage and management into specialized subsystems that can be independently optimized and controlled.
2Duration of action of stationary object
If base voltage is increased to shift cyclization load to cycle-resistant energy store, then lifespan of energy storage device is improved, but recuperation potential is reduced
Solution Approach 1:
The base voltage is not fixed but dynamically adjusted based on predictive energy management. The control unit forecasts future charge balance and stance phases, then adaptively modifies the base voltage to optimize the division of cyclization load between the two energy stores. This dynamic adjustment ensures that recuperation potential is maintained when needed while extending lifespan through reduced cycling of the lead-acid battery.
3Productivity
If predictive energy management is implemented to optimize energy flows, then efficiency and lifespan are improved, but control complexity and computational requirements increase
Solution Approach 1:
The energy management system performs preliminary forecasting of future charge balance and stance phases using navigation data, traffic information, and vehicle usage patterns. By predicting future energy requirements and regeneration opportunities in advance, the system can proactively adjust the base voltage to optimize energy store cycling before actual events occur, improving efficiency while keeping control logic manageable through rule-based predictions.
Data Source
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AI summary
The invention relates to a motor vehicle comprising a control device, a power electronic unit and an energy storage device which has a first electrical energy store and a second electrical energy storage that is or can be connected in parallel to the first electrical energy store, such that the two energy stores have a common base voltage at different charging states, that the base voltage is substantially adjustable by the power electronic unit and that a predictive energy management that can be executed on the control device determines a desired parameter of the base voltage as a function of a predictive charging balance of the energy storage device.