EV Energy Management via Battery Charge State Control
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Solution Overview
Problem
Electrified vehicles face challenges in maximizing range and operating time due to abrupt changes in energy consumption modes when the battery charge state is low, leading to inefficient use of remaining energy.
Innovation Solution
A system and method that monitor the battery charge state and dynamically adjust the power consumption mode of high current consumers, such as the electric motor, air-conditioning, and heating systems, to optimize energy use by setting specific target levels through a control unit and graphic user interface, allowing for gradual power reduction and individual control of energy-consuming devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery charge state is low, the vehicle changes from normal energy consuming mode into consumption-optimized mode, then the remaining energy can be used more efficiently, but the changeover occurs abruptly and at a point in time when the energy has already mostly been consumed
Solution Approach 1:
The control unit initiates energy optimization measures before the battery charge state reaches critically low levels. By monitoring the charge state continuously and implementing gradual power consumption reduction starting at a predetermined threshold, the system prepares for energy conservation in advance, avoiding abrupt changes when energy is nearly depleted and ensuring sufficient range is maintained.
2Duration of action of moving object
If the electrical power consumption of high current consumers is limited, then the range and operating time can be increased, but the power consumption mode changes abruptly
Solution Approach 1:
The system dynamically adjusts the power consumption mode of high current consumers in gradual steps rather than abrupt transitions. The control unit monitors the battery charge state continuously and implements progressive power reduction, adapting the power consumption level to the current charge state while maintaining stability through controlled, incremental changes rather than sudden mode switches.
3Use of energy by moving object
If a specific target level setting of electrical power consumption is set, then the energy reserves are optimized for the distance to be traveled, but the system complexity increases due to monitoring and adjustment mechanisms
Solution Approach 1:
The control unit performs multiple functions within a single integrated system: it monitors the battery charge state, calculates the distance to be traveled, determines appropriate power consumption target levels, and adjusts the power output of the electric motor and other high current consumers. This multi-functional approach optimizes energy reserves while avoiding the need for separate complex monitoring and control systems for each function.
Data Source
AI summary
A system and method for controlling the electrical power consumption of selected consumers of an electric vehicle limits power to consumers in dependence upon the prevailing charge state of a battery that is provided for driving the vehicle. The electric power consumption of high current consumers is adjusted to use an available residual amount of energy in an efficient manner. Consumers may be selected and corresponding power limits or reduction factors for the consumers and associated battery states of charge via a vehicle graphical user interface.