Dynamic Vehicle Charge Control Using Asymmetric Voltage Thresholds
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Solution Overview
Problem
Existing vehicle charge systems prolong the charging period of storage batteries when auxiliary devices consume power during gradual charging, leading to inefficiencies.
Innovation Solution
A vehicle charge system and method that dynamically switches between two charging modes based on the storage battery's terminal voltage, using a faster 'normal' mode initially and a slower 'push' mode after reaching a predetermined voltage, and reverting to the faster mode if the voltage drops below a secondary threshold, thereby optimizing charging speed and reducing frequent mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gradual charging with constant power is performed after quick charging, then overcharging is avoided and effective charging is achieved, but the charging period is prolonged when auxiliary devices consume power during gradual charging
Solution Approach 1:
The charging system dynamically switches between first charging mode (quick charging) and second charging mode (gradual charging) based on real-time terminal voltage detection. When voltage exceeds the first threshold, the system transitions to gradual charging; when voltage drops to or below the second threshold, it returns to quick charging. This dynamic adaptation optimizes charging speed while preventing overcharging, resolving the contradiction between charging efficiency and overcharging prevention.
Solution Approach 2:
The system changes charging parameters (charging speed and mode) based on battery state. By detecting terminal voltage and comparing it against predefined thresholds, the system adjusts charging current and mode to match battery needs. This parameter adaptation allows the system to prevent overcharging while minimizing charging time loss due to auxiliary device power consumption.
2Measurement precision
If the charging mode switches frequently around the first voltage threshold, then precise voltage control is achieved, but the charging process becomes unstable and inefficient
Solution Approach 1:
The system uses asymmetric voltage thresholds where the first threshold (for switching to gradual charging) is higher than the second threshold (for returning to quick charging). This creates a voltage differential that prevents the charging mode from oscillating around a single threshold value. The asymmetric design ensures stable charging operation while maintaining precise voltage control, resolving the contradiction between control precision and charging efficiency.
Data Source
AI summary
A vehicle charge system includes: a voltage detection section configured to detect terminal voltage of a storage battery; and a charge control section configured to control charging of the storage battery until the terminal voltage reaches full-charge voltage, while switching between a first charging mode and a second charging mode, on the basis of the terminal voltage. During a period in which the terminal voltage is equal to or lower than first voltage, the charge control section charges the storage battery by the first charging mode. After the terminal voltage has exceeded the first voltage, the charge control section charges the storage battery by the second charging mode. After the terminal voltage has exceeded the first voltage, if the terminal voltage has reduced to be second voltage, the charge control section charges the storage battery by the first charging mode until the terminal voltage is restored to the first voltage.