PHEV SOC Control for External Power Use and Return Range
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Solution Overview
Problem
Hybrid electric vehicles (HEVs), particularly plug-in HEVs (PHEVs), face challenges in managing state of charge (SOC) when using external devices due to limited battery capacity, risking discharge during return journeys.
Innovation Solution
A method and system for controlling SOC by receiving input on external device use, determining expected power consumption, and adjusting driving modes to ensure sufficient battery charge at the destination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the PHEV uses a smaller battery capacity compared to pure EV, then the vehicle achieves better fuel efficiency and power performance, but the battery may be discharged when used for camping with external devices
Solution Approach 1:
The system performs preliminary action by predicting the user's return time and calculating expected power consumption before the journey begins. This allows the SOC management strategy to be pre-planned, ensuring that sufficient battery charge is reserved for the return journey while maximizing external device usage during the camping period.
Solution Approach 2:
The system implements feedback by continuously monitoring actual power consumption of external devices and comparing it with predicted consumption. This feedback loop allows the system to adjust SOC management strategies in real-time, ensuring reliable vehicle operation upon return while maintaining fuel efficiency benefits.
2Adaptability or versatility
If the PHEV depletes SOC during camping to maximize external device use, then external device power availability is improved, but the vehicle cannot drive back to the starting point
Solution Approach 1:
The system calculates the minimum required SOC for the return journey in advance based on predicted power consumption and route information. This preliminary calculation establishes a safety threshold that prevents complete battery depletion, ensuring the vehicle maintains sufficient energy to return to the starting point.
Solution Approach 2:
The system dynamically adjusts the SOC management strategy based on actual power consumption patterns, weather conditions, and remaining camping time. This dynamic approach allows the vehicle to adaptively balance external device power availability with return journey requirements, optimizing both versatility and reliability.
3Reliability
If the PHEV maintains high SOC to ensure return journey capability, then driving reliability is improved, but external device power consumption is limited
Solution Approach 1:
The system changes the SOC threshold parameter dynamically based on predicted power consumption and return journey requirements. Instead of using a fixed SOC threshold, the system adjusts this parameter to maximize external device usage while ensuring sufficient charge remains for the return journey, thereby resolving the trade-off between reliability and versatility.
Data Source
AI summary
An embodiment method of controlling a state of charge of a vehicle includes receiving input of use information for driving an external device by power of a battery for driving an electric motor, determining expected power consumption of the external device based on the use information, determining a target state of charge based on the expected power consumption, and controlling a driving mode based on the target state of charge.