EV Charging Control to Prevent Auxiliary Battery Over-Discharge
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Solution Overview
Problem
Electrified vehicles face issues with troubles caused by repeated activation requests from external charging equipment while the power supply connector is connected, leading to potential over-discharge of the auxiliary battery.
Innovation Solution
The electrified vehicle is equipped with a control device that activates and deactivates an in-vehicle device using an auxiliary battery based on periodic activation requests from the external charging equipment. The control device prohibits further activation when a predetermined power consumption threshold is reached, preventing over-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the in-vehicle device is activated in response to repeated activation requests from external charging equipment, then the charging process can be properly executed, but the auxiliary battery may become over-discharged
Solution Approach 1:
The control device checks the remaining charge of the auxiliary battery before activating the in-vehicle device in response to activation requests from external charging equipment. By performing this check in advance (preliminary action), the system prevents activation that would lead to over-discharge, thus resolving the contradiction between reliable charging execution and preserving auxiliary battery charge.
2Adaptability or versatility
If the in-vehicle device is activated repeatedly while the power supply connector is connected, then charging requests are properly handled, but the remaining charge of the auxiliary battery decreases
Solution Approach 1:
The control device continuously monitors the remaining charge of the auxiliary battery and uses this feedback information to decide whether to activate the in-vehicle device in response to activation requests. When the remaining charge falls below a predetermined threshold, the control device prohibits activation, thus adapting the system's response to charging requests based on the current battery state and preventing further charge depletion.
Data Source
AI summary
An electrified vehicle includes a battery, an inlet to which a power supply connector of an external charging equipment is connected, a predetermined in-vehicle device that uses an auxiliary battery as a power source and is used for charging the battery, and a control device that activates the predetermined in-vehicle device in response to an activation request periodically transmitted from the external charging equipment while the power supply connector is connected to the inlet, and stops the predetermined in-vehicle device in response to a transmission stop of the activation request, and the control device prohibits the activation of the predetermined in-vehicle device in response to the activation request when the physical quantity representing the power consumption of the predetermined in-vehicle device becomes equal to or more than a predetermined threshold while the charging of the battery is stopped and the power supply connector is connected to the inlet.