Dynamic Charge Level Adjustment for Vehicle-to-Home Power Management
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Solution Overview
Problem
Existing power management systems for electric vehicles cannot ensure sufficient power for emergency travel while also supplying power to a house, as maintaining a high charge level for emergencies reduces the vehicle's ability to supply power to the house.
Innovation Solution
A power management device that detects the presence of additional vehicles using various methods (sensors, communication, or user input) and adjusts the electric vehicle's charge level to ensure emergency travel capability by dynamically changing the lower limit of the charge level, allowing more power to be supplied to the house when no emergency vehicle is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge level is maintained at a high level to ensure emergency travel capability, then the vehicle can travel in emergencies, but the vehicle cannot supply so much electric power to the house
Solution Approach 1:
The patent applies dynamics by making the charge level lower limit variable rather than fixed. The power management device dynamically adjusts the lower limit charge level based on whether another vehicle is detected. When no other vehicle is present, the lower limit is set lower to allow more power discharge to the house; when another vehicle is detected, the lower limit is raised to ensure emergency travel capability. This dynamic adjustment resolves the contradiction between maintaining emergency readiness and maximizing power supply to the house.
2Reliability
If the charge level is maintained constant to secure emergency travel, then the user can move by vehicle in emergencies, but the electric vehicle cannot supply maximum power to the house
Solution Approach 1:
The patent applies parameter changes by modifying the lower limit charge level parameter based on external conditions (presence of other vehicles). The power management device changes this parameter dynamically: when no other vehicle is detected, the lower limit is reduced to enable higher productivity in power supply; when another vehicle is present, the lower limit is increased to maintain reliability for emergency travel. This parameter adjustment strategy resolves the contradiction between emergency readiness and power supply productivity.
3Reliability
If the vehicle always keeps minimum secured power, then emergency travel is ensured, but power supply to house is reduced
Solution Approach 1:
The patent applies dynamics by transforming the static minimum secured power concept into a dynamic variable. Instead of always maintaining a fixed minimum charge level, the system dynamically adjusts the lower limit based on the presence of other vehicles. When no other vehicle is available, the lower limit is set lower to maximize energy available for house power supply; when another vehicle is present, the lower limit is raised to ensure emergency travel capability. This dynamic approach reduces energy loss to the house when possible while maintaining reliability when needed.
Data Source
AI summary
In order to manage power exchanged between an electric vehicle 1 and a house system 2 including an electric device 22, a power management device includes a vehicle detection portion 26 configured to detect a vehicle available for a resident of the house. A controller 24 determines power supplied from the electric vehicle 1 to the house system 2 in accordance with the presence of the vehicle detected by the vehicle detection portion 26. The power management device can thereby supply power from an electric vehicle to a house while securing the situation where the resident can move by vehicle in emergencies.