Electric Vehicle Power Supply Controller for External Equipment
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Solution Overview
Problem
In electric vehicles, a low state of charge (SOC) of the battery can lead to frequent engine operation for charging, which deteriorates fuel efficiency due to improper management of SOC when supplying power to external equipment.
Innovation Solution
An electric vehicle system that includes a vehicle-mounted electric power storage device, an electric power generation mechanism, an electric power supply device, and a controller to control electric power supply, setting an upper limit for charging the battery to prevent prolonged low SOC states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electric power is supplied to external equipment using vehicle-mounted battery, then external equipment can be powered, but the battery SOC may become low and trigger frequent engine operation for charging
Solution Approach 1:
The control device continuously monitors the SOC of the power storage device and adjusts the power supply to external equipment based on feedback from SOC levels. When SOC is high, power supply is permitted; when SOC drops below a threshold, power supply is restricted and engine operation is triggered to recharge, creating a closed-loop control system that optimizes fuel efficiency while maintaining power supply capability
Solution Approach 2:
The system dynamically adjusts the power supply characteristics to external equipment based on real-time battery SOC conditions. The control device modifies output power levels and supply duration according to battery state, enabling the system to adapt between providing maximum power when SOC is high and restricting power when SOC is low, thereby resolving the contradiction between power supply capability and fuel efficiency
2Duration of action of stationary object
If battery SOC is not properly managed during external equipment power supply, then power supply can continue indefinitely, but forced charging with engine operation occurs frequently
Solution Approach 1:
The control device performs preliminary assessment of battery SOC before permitting power supply to external equipment. By checking SOC levels in advance and setting appropriate thresholds, the system prevents situations where prolonged power supply would deplete the battery to critical levels, thereby avoiding frequent forced charging cycles and improving overall fuel efficiency
Solution Approach 2:
The system implements continuous feedback monitoring of SOC during power supply operation. When SOC approaches critical thresholds, the control device automatically adjusts or terminates power supply to external equipment and triggers engine operation for recharging, creating a self-regulating mechanism that prevents prolonged low-SOC states and optimizes fuel consumption
Data Source
AI summary
An electric vehicle includes: a vehicle-mounted electric power storage device; an electric power generation mechanism that is configured to generate charging electric power for charging the electric power storage device; an electric power supply device that is configured to supply electric power to external equipment that is not a component of the electric vehicle, by using output electric power from the electric power storage device; and a controller that is configured to control electric power to be supplied by the electric power supply device, according to information indicative of an upper limit of the electric power for charging the electric power storage device.