Noncontact Vehicle Power Supply With Dual Wireless Charging Control
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Solution Overview
Problem
Current traveling noncontact power supply systems face inefficiencies due to unnecessary narrow-area wireless communication and the risk of overcharging of power storage devices during regenerative braking in vehicles.
Innovation Solution
The system employs a dual communication approach with wide-area and narrow-area wireless communication devices to manage power transfer, allowing for regenerative braking control and power requests only when necessary, thereby minimizing unnecessary communication and preventing overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrow-area wireless communication is constantly performed to ensure safe power supply, then overcharging of power storage device is prevented, but communication efficiency deteriorates due to unnecessary communication
Solution Approach 1:
The system performs wide-area wireless communication in advance to exchange information such as vehicle identification, required power, and location before the vehicle enters the narrow-area communication range. This preliminary action allows the system to prepare for potential power supply needs without requiring constant narrow-area communication, thereby preventing overcharging while reducing unnecessary communication.
Solution Approach 2:
The system switches between wide-area and narrow-area wireless communication based on the vehicle's position and power supply status. Wide-area communication is used for initial information exchange, while narrow-area communication is activated only when the vehicle is in range and power supply is needed. This periodic switching optimizes communication efficiency while maintaining safety.
2Loss of energy
If narrow-area wireless communication is not performed to save communication resources, then communication efficiency is improved, but overcharging of power storage device occurs
Solution Approach 1:
The system uses wide-area wireless communication as an intermediary to exchange preliminary information about vehicle identification, required power, and location before activating narrow-area communication. This intermediary communication layer allows the system to make informed decisions about when narrow-area communication is actually needed, preventing overcharging while optimizing communication resource usage.
3Use of energy by moving object
If regenerative braking is always permitted to maximize energy recovery, then energy efficiency is improved, but overcharging of power storage device occurs during noncontact power supply
Solution Approach 1:
The system continuously monitors the charging status of the power storage device and the status of noncontact power supply through communication between the vehicle and power supply device. When both charging is in progress and noncontact power supply is active, the system provides feedback to prohibit regenerative braking, preventing overcharging while allowing it when safe, thereby optimizing energy recovery.
4Device complexity
If information exchange is performed only through wide-area wireless communication, then device complexity is reduced, but communication precision deteriorates for power control
Solution Approach 1:
The communication system is segmented into two layers: wide-area wireless communication for preliminary information exchange (vehicle identification, location, required power) and narrow-area wireless communication for precise power control and status monitoring. This segmentation allows each communication layer to be optimized for its specific function, maintaining low overall complexity while achieving high precision where needed.
Data Source
AI summary
A traveling noncontact power supply system of the present disclosure supplies electric power from a road-side power supply device to a vehicle-side power receiving device in a contactless manner. The road-side power supply device has a first communication device for wide-area wireless communication and a second communication device for short-range wireless communication. The vehicle-side power receiving device has a third communication device for wide-area wireless communication and a fourth communication device for short-range wireless communication. The vehicle can perform regenerative braking to charge a power storage device. If the compatibility between the road-side power supply device and the vehicle-side power receiving device is satisfied, and there is a possibility that the power storage device is overcharged, predetermined charging control is performed by short-range wireless communication to prevent overcharging of the power storage device. If there is no possibility, the predetermined charging control by short-range wireless communication is not performed.