Battery Relay Reconnection Timing for Reliable Vehicle Restart
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Solution Overview
Problem
Existing vehicle systems face challenges in determining when to reconnect an auxiliary battery after electrical disconnection due to low power supply output, leading to potential failure in starting the vehicle.
Innovation Solution
A control device that dynamically adjusts the time period for reconnecting a relay based on battery conditions and communication establishment with the vehicle system, prioritizing relay connection over stable power supply detection when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay is switched from disconnected state to connected state when external charger is connected, then the vehicle system can be restarted, but the vehicle system may fail to start due to insufficient power when the external charger output is low
Solution Approach 1:
The patent applies dynamics by making the time period threshold dynamic rather than fixed. The control device changes the time period threshold based on whether communication with the vehicle system is established, allowing the system to adapt to different operational states. When communication is established, a shorter time period threshold is used, enabling faster relay switching. When communication is not established, a longer time period threshold ensures sufficient power availability before switching, thus resolving the contradiction between restart reliability and power sufficiency.
2Device complexity
If a fixed time period threshold is used for relay switching determination, then the control logic is simple, but the system cannot adapt to different communication states and power conditions
Solution Approach 1:
The patent applies parameter changes by modifying the time period threshold parameter based on communication state. Instead of using a single fixed threshold, the system switches between different threshold values depending on whether communication with the vehicle system is established. This allows the system to maintain relatively simple control logic while achieving adaptability to different operational conditions, resolving the contradiction between simplicity and versatility.
Data Source
AI summary
A control device that controls a battery includes one or more processors configured to: acquire a physical quantity of the battery; detect a predetermined signal; control a relay based on the physical quantity of the battery, the relay being connected between the battery and a predetermined device to which power is supplied from the battery; connect the relay when the physical quantity of the battery has continuously satisfied a predetermined condition for a first time period while the relay is in a disconnected state; and change the first time period depending on whether the predetermined signal has been detected by the one or more processors.