EV Charging Driveaway Prevention via Driveline Restraint
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Solution Overview
Problem
Existing systems for hybrid electric and electric vehicles do not effectively prevent vehicle movement when an external power supply cord is connected for charging, allowing potential driveaway due to gravity or secondary power sources like internal combustion engines.
Innovation Solution
A method and system that detect the connection of an external power supply cord and apply a mechanical restraint to the driveline, such as preventing the release of the parking brake or shifting out of park, to prevent vehicle movement until the charging system is secure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external power supply cord is connected to charge the battery, then the vehicle can be charged from the electrical grid, but the vehicle may inadvertently move or roll under gravity or propulsion from a secondary power source
Solution Approach 1:
The system performs preliminary detection of the charging connection status before allowing vehicle movement. The control system checks whether an external power supply cord is connected to the battery charger, and based on this detection, prevents release of the parking brake or shifting out of park position. This preliminary action ensures that the vehicle cannot move while charging, eliminating the hazard before it can occur.
2Object-affected harmful factors
If the mechanical restraint is prevented from releasing, then the vehicle is prevented from driveaway, but the vehicle cannot be driven when charging is needed
Solution Approach 1:
The control system continuously monitors the charging connection status through feedback from sensors detecting whether an external power supply cord is connected. Based on this feedback, the system automatically adjusts the mechanical restraint state - preventing release when charging is detected, and allowing release when no charging connection is present. This feedback mechanism ensures the vehicle is protected during charging while maintaining normal operability when charging is not occurring.
Data Source
AI summary
A system and method are disclosed for preventing driveaway or roll away of a plug-in electric vehicle when it is being charged or is coupled to an external power supply cord. When it is detected based on at least one of the following conditions: a current is flowing to the battery charger, a voltage source is coupled to the battery charger, an access door allowing access to the receptacle on board the vehicle is open and/or a plug detect switch indicates that a plug is coupled with the receptacle, a mechanical restraint on the driveline is prevented from being released. The mechanical restraint may be a parking brake. Alternatively, the mechanical restraint may include preventing the gear shift selector from being moved out of the park position.