EV Charging Connection Detection for Accurate Remaining Time
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Solution Overview
Problem
Conventional electric vehicles experience discomfort for users when charging is interrupted by the operation of a switch on the cable device connecting the charging device to an external power source, causing the remaining charge time to be cleared and treated as a new charge, leading to an inaccurate display of charging status.
Innovation Solution
The electric vehicle incorporates a connection detection device and a controller that retains the supplied power and calculates the remaining charge time even when the connection is interrupted, ensuring continuous and accurate display of charging status by using a connection switch to transmit connection signals and maintaining chargeable power before disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection switch on the cable device is operated to interrupt power supply, then the power supply is disconnected, but the remaining charge time is incorrectly cleared and treated as a new charge, causing user discomfort
Solution Approach 1:
The connection detection device provides feedback to the controller about the connector state. The controller uses this feedback to determine whether to clear the remaining charge time - only clearing it when the connector is actually disconnected, not when the switch is temporarily operated. This feedback mechanism resolves the contradiction by maintaining charging status accuracy while avoiding unnecessary resets that would cause user discomfort.
Solution Approach 2:
The connection detection device acts as an intermediary between the physical connector state and the controller's charging status management. It provides accurate information about whether the cable is truly disconnected, enabling the controller to make informed decisions about whether to reset the remaining charge time display, thus preventing incorrect status clearing.
2Reliability
If the controller clears remaining charge time when power supply is interrupted, then the charging status is reset, but this causes inaccurate display when the interruption is temporary
Solution Approach 1:
The connection detection device provides continuous feedback to the controller about the connector state. This feedback allows the controller to distinguish between temporary switch operations (connector still connected) and permanent disconnections (connector actually removed). The controller only clears the remaining charge time information when the feedback indicates true disconnection, preserving information during temporary interruptions.
Solution Approach 2:
The controller checks the connector state before clearing the remaining charge time information. This preliminary verification ensures that information is only lost when appropriate - when the cable is truly disconnected - and not during temporary switch operations where the charging session should be maintained.
Data Source
AI summary
The controller retains the supply power before receiving the connection signal in the disconnected state and calculates the remaining charging time, when a connection signal of the disconnection state is received by operating the connection switch while the charging device is charging the power storage device using power from the external power source with the charging device connected to the external power source via the cable device, and further when the connection between the vehicle side connector and the cable side connector is detected by the connection detection device.