Vehicle Modem Standby Power Control via TCU Monitoring
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Solution Overview
Problem
Vehicle modems experience increased battery discharge due to prolonged standby power consumption when frequently switching between service and no-service states, especially in communication shadow areas or when parked, leading to unnecessary current consumption.
Innovation Solution
A system comprising a Telematic Control Unit (TCU) that monitors the modem's communication environment and cuts off standby power before the preconfigured standby time terminates, either when the count of state changes between normal and no-service states exceeds a reference value or when the number of communication network registrations reaches a threshold, preventing battery discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the modem maintains standby state for preconfigured time to enable vehicle start or receive user signals, then the responsiveness to user input is improved, but battery discharge increases due to prolonged current consumption
Solution Approach 1:
The TCU performs preliminary detection of communication environment stability before the standby time expires. When instability is detected (frequent state changes or excessive network registrations), the system proactively cuts off power to the modem in advance, preventing unnecessary battery discharge while still maintaining the ability to respond to user input when communication conditions are favorable.
Solution Approach 2:
The system continuously monitors communication environment parameters (service state, network registration count) and uses this feedback to dynamically control modem power state. The TCU counts state changes and network registrations, and based on this feedback, decides whether to maintain standby power or cut it off early, creating a closed-loop control system that balances responsiveness with energy conservation.
2Reliability
If the modem frequently monitors communication environment to maintain stable service, then communication reliability is improved, but current consumption increases leading to battery discharge
Solution Approach 1:
The system changes the operational parameters of the modem based on detected communication environment conditions. When instability is detected (excessive state changes or network registrations), the system changes the modem's power state parameter from standby to off, reducing current consumption while maintaining communication reliability when conditions are stable.
3Speed
If the modem remains in standby state for extended periods, then the ability to quickly respond to vehicle start or user signals is maintained, but unnecessary current consumption occurs in unfavorable communication environments
Solution Approach 1:
The system dynamically adjusts the modem's power state based on real-time communication environment assessment. Instead of maintaining a fixed standby state for the entire preconfigured time, the system adapts the modem's operational state (standby or off) according to detected communication stability, achieving a dynamic balance between response speed and energy conservation.
Data Source
AI summary
Provided is a device for controlling an operation of a modem for a vehicle in order to prevent battery discharge, comprising: a modem for a vehicle mounted on the vehicle; and a TCU (Telematic Control Unit) for frequently or periodically detecting a communication environment of the modem for the vehicle when the modem for the vehicle enters a standby state mode, and, when the number of times of repetition of a normal service state and a no-service state is larger than or equal to a reference value or when the number of times of repetition of communication network registration is larger than or equal to the reference value, cutting off standby power of the modem for the vehicle even before a standby time preconfigured in the modem terminates.