Battery Performance Deterioration Detection in Mild Hybrid Vehicles
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Solution Overview
Problem
Mild hybrid electric vehicles face challenges in determining battery performance deterioration, which can lead to suboptimal fuel efficiency and the potential misuse of low-cost batteries like lead-acid batteries instead of high-performance batteries like AGM or lithium-ion batteries.
Innovation Solution
A method and apparatus that detect vehicle speed, accelerator and brake pedal positions, and battery state of charge to determine if a regenerative braking condition is met, calculating the difference between target and actual SOC increments to assess battery performance, and displaying warnings if performance is deteriorated, using sensors and a controller to operate the MHSG and hydraulic pressure actuator for regenerative and friction braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a lead-acid battery is used instead of AGM or lithium-ion battery, then cost is reduced, but battery performance and fuel efficiency deteriorate
Solution Approach 1:
The system continuously monitors battery performance by comparing actual SOC increment against target SOC increment during regenerative braking events. When the difference exceeds a threshold, the ECU provides feedback to the driver through warning indicators, creating a closed-loop system that detects and reports battery deterioration without requiring complex hardware changes.
Solution Approach 2:
The battery performance determination system uses existing vehicle sensors and control units to automatically monitor and assess battery health. The ECU leverages available data from the regenerative braking system to self-diagnose battery performance, eliminating the need for separate diagnostic equipment or complex additional sensing systems.
2Loss of time
If battery performance deterioration is not detected, then maintenance is delayed, but fuel efficiency and vehicle performance deteriorate
Solution Approach 1:
The system performs preliminary assessment of battery performance by continuously monitoring SOC changes during regenerative braking events. By detecting performance deterioration early through cumulative analysis of multiple braking events, the system enables proactive maintenance scheduling before significant performance loss occurs, preventing fuel efficiency degradation.
3Measurement precision
If complex monitoring systems are added to detect battery performance, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The ECU acts as an intermediary that processes battery performance assessment using existing sensor data and control algorithms. Rather than adding complex dedicated monitoring hardware, the system leverages the ECU's existing computational capabilities and available sensor inputs to accurately determine battery health, maintaining simplicity while achieving reliable detection.
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
Effectively determines battery performance deterioration, prompting necessary maintenance and preventing the use of low-cost batteries by providing clear warnings to drivers, thereby maintaining optimal vehicle efficiency.
Implementation Method 1
a mild hybrid starter and generator (MHSG) configured to start the engine or generate electricity according to an output of the engine
Data Source
AI summary
A method for determining performance of a battery for a mild hybrid electric vehicle may include detecting a speed of the mild hybrid electric vehicle, a position value of an accelerator pedal, a position value of a brake pedal, and a state of charge (SOC) of the battery, determining whether a regenerative braking condition is satisfied, determining a demand braking amount of a driver, determining a regenerative braking allowance, operating a mild hybrid starter and generator (MHSG) to generate regenerative braking torque corresponding to the regenerative braking allowance, determining a target SOC increment amount, determining an actual SOC increment amount, and determining that the performance of the battery is deteriorated when a difference in value between the target SOC increment amount and the actual SOC increment amount is equal to or greater than a reference value.