Vehicular Solar Charging Control for Battery Overcharge Prevention
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Solution Overview
Problem
The existing vehicular solar power generation systems risk overcharging high-voltage batteries when the total electric power generated by solar panels and regenerative power exceeds the battery's charging capacity, potentially affecting vehicle behavior and reducing the effectiveness of regenerative braking.
Innovation Solution
A vehicular charging control system that calculates a chargeable electric power amount for the high-voltage battery and adjusts charging based on regenerative power generation, limiting the charge from solar panels to prevent overcharging and prioritize regenerative power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the high-voltage battery is charged with both solar power and regenerative power, then the total electric power supplied to the battery increases, but the risk of overcharging increases
Solution Approach 1:
The control unit calculates the chargeable electric power amount in advance before charging begins, determining the maximum capacity available for solar charging based on current battery state and regenerative power predictions. This preliminary calculation prevents overcharging by establishing charging limits before the charging process starts.
Solution Approach 2:
The system continuously monitors the actual regenerative power generation and compares it with the calculated chargeable electric power amount. The control unit adjusts the solar charging power in real-time based on feedback from the battery state of charge and regenerative power actual values, ensuring the total power input does not exceed battery capacity.
2Productivity
If the chargeable electric power amount is calculated considering regenerative power, then regenerative power utilization is prioritized, but the charging control complexity increases
Solution Approach 1:
The control unit performs preliminary calculations of the chargeable electric power amount by subtracting predicted regenerative power from the battery's maximum chargeable capacity. This advance planning allows the system to prioritize regenerative power utilization without requiring complex real-time decision-making algorithms during charging operation.
Solution Approach 2:
The system dynamically adjusts the chargeable electric power amount parameter based on changing regenerative power conditions. When regenerative power availability changes, the control unit recalculates and updates the chargeable power amount, allowing flexible prioritization of regenerative power while maintaining manageable control logic through parameter adjustment rather than structural complexity.
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
Prevents high-voltage battery overcharging, enhances regenerative braking effectiveness, and efficiently manages electric power distribution among batteries, ensuring optimal vehicle performance and battery health.
Implementation Method 1
a solar panel configured to generate electric power in accordance with solar energy
Implementation Method 2
regenerative electric power generated through regeneration by an actuator
Data Source
AI summary
A vehicular charging control system using a solar panel includes: a first battery; a calculation unit that calculates a chargeable electric power amount (an amount of electric power with which the first battery can be charged until the SOC of the first battery reaches a predetermined value); a determination unit that determines whether regenerative electric power is being generated; and a control unit that controls charging of the first battery with electric power generated by the solar panel. The control unit allows the first battery to be charged with the electric power generated by the solar panel up to an upper limit set to the chargeable electric power amount when regenerative electric power is not being generated, and up to an upper limit set to an electric power amount obtained by subtracting the regenerative electric power amount from the chargeable electric power amount when regenerative electric power is being generated.