Mild Hybrid State-of-Charge Control via Predictive Thresholds
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Solution Overview
Problem
Mild hybrid vehicles face inefficiencies in energy storage management, leading to suboptimal fuel consumption and emissions, as existing strategies either reserve too much energy, leading to inefficient fuel conversion or not enough, resulting in insufficient energy for vehicle features like start-stop and freewheel engine functions.
Innovation Solution
The procedure optimally selects the target charging status area by dividing the energy storage device's usable area into reserves for energy recovery and consumption, determining upper and lower threshold values based on predicted driving conditions and vehicle parameters, ensuring efficient energy use and minimizing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If energy is reserved in the energy storage device to ensure sufficient supply for start-stop and freewheel functions, then reliability of vehicle features is improved, but fuel consumption increases due to inefficient fuel conversion
Solution Approach 1:
The patent implements dynamic adjustment of the target state-of-charge range based on predicted driving conditions. The control device adapts the energy reservation strategy in real-time, expanding or contracting the target SOC range according to forecasted energy demands from start-stop and freewheel functions, thereby optimizing the balance between reliability and fuel consumption
Solution Approach 2:
The patent uses predictive algorithms to forecast future energy requirements before they occur. By determining the target state-of-charge range in advance based on predicted driving conditions, the system proactively prepares the energy storage device to meet future demands, avoiding both over-reservation and under-reservation of energy
2Reliability
If the target state of charge range is set too high, then energy supply reliability is improved, but fuel efficiency deteriorates due to excessive energy reserve
Solution Approach 1:
The patent dynamically changes the target state-of-charge parameter based on predicted driving conditions. The control device adjusts the target SOC range boundaries (upper and lower limits) according to forecasted energy demands, transforming the static parameter into a dynamic one that adapts to varying operational requirements, thereby optimizing both reliability and fuel efficiency
3Use of energy by moving object
If the target state of charge range is set too low, then fuel consumption is reduced, but energy supply sufficiency deteriorates for vehicle features
Solution Approach 1:
The patent implements a feedback mechanism where the control device continuously monitors actual energy consumption patterns and compares them with predictions. Based on this feedback, the system refines its predictive models and adjusts the target state-of-charge range accordingly, ensuring that energy supply sufficiency is maintained while minimizing fuel consumption
Data Source
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AI summary
The invention relates to a method for controlling an energy storage device (10) of a mild hybrid motor vehicle, wherein the energy storage device (10) has an overall capacity, wherein a state-of-charge control device (32) of the energy storage device (10) sets a state of charge of the energy storage device (10) between an upper threshold value (oSW) and a lower threshold value (uSW) for a target state-of-charge range (18) of the energy storage device (10), wherein during at least one journey at least one charging process (34) and one discharging process (36) are monitored with respect to quantities of energy which are exchanged with the energy storage device (10) and quantities of energy which are to be expected with a predefinable probability for future charging processes and discharging processes are determined, and wherein the upper threshold value (oSW) and the lower threshold value (uSW) for the target state-of-charge range (18) of the energy storage device (10) are defined on the basis of the determinations in step b). The invention also relates to a corresponding state-of-charge control device (32) for a mild hybrid motor vehicle.