Vehicular Key System Power Management via Wake Signals
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Solution Overview
Problem
Existing vehicular key systems face inefficiencies in power management, particularly with vehicular mobile devices remaining in active communication modes even when not needed, leading to unnecessary power consumption.
Innovation Solution
The system employs a configuration where the in-vehicle device performs authentication with both mobile terminals and vehicular mobile devices, using a wake signal to transition the vehicular mobile device into a state where short-range communication is possible only when necessary, thereby reducing power consumption by controlling the operation of communication modules based on the mobile terminal's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicular mobile device remains in active communication mode to ensure immediate responsiveness, then the system reliability is improved, but the power consumption increases
Solution Approach 1:
The vehicular mobile device dynamically switches between active communication mode and low-power state based on whether short-range communication is needed. The device transitions to active mode only when the in-vehicle device determines communication is required, and returns to low-power state when communication is not needed, optimizing the balance between responsiveness and power consumption
Solution Approach 2:
The system implements periodic wake-up signals that transition the vehicular mobile device from low-power state to active communication mode at scheduled intervals or when triggered by the in-vehicle device, allowing the device to remain responsive while spending most time in power-saving mode
2Reliability
If the communication module operates continuously to maintain connection readiness, then the communication reliability is improved, but the battery life decreases
Solution Approach 1:
The communication module dynamically adjusts its operational state based on communication needs. When the in-vehicle device determines that short-range communication is required, the module transitions to active mode; otherwise, it enters low-power state, thereby extending battery life while maintaining communication reliability when needed
Solution Approach 2:
The vehicular mobile device autonomously manages its own power state transitions based on received wake signals from the in-vehicle device, eliminating the need for continuous monitoring and enabling self-regulated power consumption optimization
Data Source
AI summary
A smart key and a mobile terminal store therein key information to be used for authentication with a vehicle to function as a key (key device) of a vehicle. Each of the smart key and the mobile terminal performs communication for authentication with an in-vehicle system or the like by BLE communication. For power saving, the smart key basically operates in a sleep mode in which the BLE communication is not possible. On receiving a wake signal periodically transmitted from the vehicle, the smart key transitions to a state where the BLE communication is possible. When sensing the presence of the mobile terminal within a predetermined distance from the vehicle, the in-vehicle system stops the periodic transmission of the wake signal.