On-Board Charger Voltage Measurement for Reserved Charging
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Solution Overview
Problem
Hybrid electric vehicles and electric vehicles face inefficiencies in reserved charging due to varying input voltages and charger types, leading to insufficient charging before departure times and confusion for drivers regarding optimal charging logic.
Innovation Solution
A vehicle charging control method that measures the input voltage using an on-board charger controller, sets a charging start time based on the measured voltage, and adjusts the charging process to ensure full charging during discounted electricity rates, thereby optimizing the reserved charging function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reserved charging is performed based on fixed charging logic without voltage measurement, then the charging control is simple, but the battery may not be sufficiently charged by departure time due to voltage variations
Solution Approach 1:
The system performs preliminary voltage measurement before actual charging begins. The OBC controller measures the input voltage at the input side when an external charger supplies power, before the charging process starts. This preliminary action allows the system to determine the appropriate charging start time based on actual voltage conditions, ensuring reliable charging completion by departure time without adding complex real-time control mechanisms during charging.
2Reliability
If charging starts early to ensure full charging, then charging completion is guaranteed, but the use of discounted late night electricity rates is reduced
Solution Approach 1:
The system dynamically determines the charging start time based on measured input voltage rather than using a fixed schedule. By measuring the actual input voltage at the input side of the OBC controller, the system calculates the precise charging duration needed and sets the charging start time accordingly. This dynamic adjustment ensures the battery is fully charged by departure time while maximizing utilization of discounted late night electricity rates.
3Adaptability or versatility
If different charging logic is applied for different charger types (ICCB and EVSE), then charging compatibility is improved, but driver confusion increases
Solution Approach 1:
The system uses a universal charging control approach that works across different charger types (ICCB and EVSE). Instead of implementing separate charging logic for each charger type, the system measures the input voltage at the input side of the OBC controller regardless of charger type, and determines charging start time based on this measurement. This universal approach maintains compatibility with different charger types while simplifying the user interface and avoiding driver confusion.
Data Source
AI summary
A charging control method of a vehicle includes setting a reserved charging, closing a first switch in an on-board charger (OBC) controller, measuring an input voltage at an input side of the OBC controller when an external charger supplies power when the first switch is closed, setting a charging start time based on the measured input voltage, and starting charging a battery when the charging start time is reached.