Mobile Device Local Charge Storage for EV Offline Access
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Solution Overview
Problem
Current systems for remotely determining an electric vehicle's state of charge are ineffective when the mobile device cannot communicate with the vehicle, particularly in areas without wireless communication networks, such as underground garages.
Innovation Solution
A method using a mobile device that stores electric vehicle charge status information via short-range wireless communication protocols like Bluetooth when the vehicle is stopped, allowing the device to respond to user requests for the state of charge even if communication with the vehicle is lost, by either directly determining the state from stored data or forwarding requests to a remote server for determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile device uses standard wireless communication to remotely access the vehicle's state of charge, then the driver can obtain real-time charge information, but the system fails when the vehicle is parked in locations without wireless network coverage
Solution Approach 1:
The system performs preliminary actions by storing charge status information locally in the vehicle's memory before wireless communication is needed. The OBD device continuously monitors and saves charge status data, so when the driver later requests charge information, the system can retrieve pre-stored data without requiring real-time wireless connection to the vehicle.
Solution Approach 2:
The system introduces an intermediary layer consisting of local storage memory and short-range wireless communication (Bluetooth) between the OBD device and mobile device. This intermediary allows data transfer and storage without requiring continuous connection to the vehicle's wireless network, enabling access to charge information even when the vehicle is in areas without network coverage.
2Loss of information
If the system continuously communicates with the vehicle to obtain real-time charge status, then the information is always current, but the system cannot function when wireless communication is unavailable
Solution Approach 1:
The OBD device continuously monitors charge status and pre-stores this information in local memory before it might be needed. This preliminary data collection ensures that when the driver later requests charge information, the most recently stored data is available, minimizing information loss without requiring continuous real-time communication.
Solution Approach 2:
The system creates copies of the charge status information and stores them locally in the vehicle's memory and potentially in the mobile device. These copies serve as backups that can be accessed when the original data source (vehicle wireless network) is unavailable, ensuring information reliability without continuous communication.
3Ease of operation
If the mobile device stores charge status information locally, then the device can respond to requests without communicating with the vehicle, but the information may become outdated
Solution Approach 1:
The system implements periodic updates of the stored charge status information. The OBD device continuously monitors charge status and updates the stored data at regular intervals or when changes occur, ensuring that the locally stored information remains as current as possible while still allowing the system to function without continuous vehicle communication.
Data Source
AI summary
A mobile device stores charge status information of an electric vehicle. The charge status information is received by the mobile device from the electric vehicle via a short range wireless communication protocol in response to a triggering event at the vehicle indicating that the vehicle has been stopped. The mobile device at a later point receives a request from a user, the request involving a current state of charge of the electric vehicle. The mobile device attempts to communicate with electric vehicle to obtain information from the vehicle for responding to the request. If the mobile device is not able to communicate with the vehicle, the mobile device respond's to the user's request using the stored charge status information.