Vehicle Control Device for Battery Charge Voltage Optimization
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Solution Overview
Problem
Existing vehicle control systems fail to effectively manage battery state of charge, particularly during repeated short trips and long-time parking, leading to insufficient charging and potential battery rundown.
Innovation Solution
A vehicle control device that obtains parking time and vehicle usage data to estimate a charge-discharge balance, calculating an evaluation value to adjust the battery charge voltage, thereby optimizing charge control based on the derived evaluation value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery is charged during short trips, then the charge time is insufficient, but if the vehicle is parked for long time, then the state of charge decreases significantly due to discharge
Solution Approach 1:
The control device performs preliminary charging action during the vehicle's parking period before the next trip. By obtaining the parking time and estimating charge-discharge balance in advance, the system charges the battery during the parking period when the vehicle is not in use, ensuring sufficient charge accumulation before the next trip begins, thus resolving the contradiction between limited charge time and maintaining reliable state of charge
Solution Approach 2:
The system dynamically adjusts the charge voltage based on the estimated charge-discharge balance and parking time. The voltage control unit modifies the charge voltage command value in real-time according to the evaluation results, making the charging process adaptive to different parking durations and usage patterns, thereby optimizing charge efficiency within the available time while ensuring adequate state of charge maintenance
2Device complexity
If conventional charge control is used, then the control is simple, but the state of charge cannot become a predetermined target value during vehicle use
Solution Approach 1:
The control device implements a feedback mechanism by obtaining actual parking time, estimating charge-discharge balance, evaluating the result, and adjusting the charge voltage command value accordingly. This closed-loop feedback system continuously monitors charging effectiveness and modifies control parameters to ensure the state of charge reaches the predetermined target value, resolving the contradiction between control simplicity and target achievement reliability
Solution Approach 2:
The system performs self-assessment by estimating its own charge-discharge balance based on parking time and usage data. The control device autonomously evaluates whether the battery is charging or discharging during parking periods and adjusts its charging strategy accordingly, enabling the system to self-correct and achieve target state of charge without complex external intervention
Data Source
AI summary
A vehicle control device configured to control charge and discharge of a battery mounted on a vehicle includes an obtaining unit configured to obtain a parking time of the vehicle, a setting unit configured to derive a charge voltage of the battery based on at least the parking time obtained by the obtaining unit, and a voltage control unit configured to control charge of the battery based on the charge voltage of the battery derived by the setting unit when the vehicle is traveling.