Wireless Key Mode Switching for Battery Conservation
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Solution Overview
Problem
The existing smart key systems for vehicle door remote locking and unlocking suffer from premature battery depletion due to continuous standby mode, leading to unnecessary power consumption and potential malfunction, especially in spare keys that are not frequently used.
Innovation Solution
A wireless key system with a control circuit that allows mode switching between power-saving and full-power modes, where the power-saving mode stops reception of polling signals while allowing transmission of lock/unlock instructions, thereby conserving battery life and preventing unnecessary standby state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver circuit is kept in reception standby state to receive polling signals, then the wireless key can respond to door locking and unlocking operations, but the battery power is consumed continuously leading to premature battery depletion
Solution Approach 1:
The receiver circuit dynamically switches between reception standby state and power-saving state based on operational needs. The control circuit activates the receiver only when door locking/unlocking operations are detected, and deactivates it during idle periods, making the system adaptive rather than static.
Solution Approach 2:
Instead of continuous reception, the system uses periodic polling where the receiver circuit is activated only at specific intervals when polling signals are expected. This transforms continuous power consumption into periodic, controlled consumption cycles.
2Reliability
If the receiver circuit operates continuously in reception standby state, then authentication can be performed reliably, but the battery lifetime is reduced especially in spare keys that are not frequently used
Solution Approach 1:
The system adapts its operational state based on usage patterns. Frequently used keys maintain higher readiness, while spare keys automatically transition to power-saving mode, extending their battery life without compromising authentication reliability when needed.
Solution Approach 2:
The receiver circuit's operational parameters (power state, reception sensitivity) are dynamically adjusted based on whether the key is actively being used or stored as a spare, optimizing the balance between reliability and battery duration for different usage scenarios.
3Reliability
If the receiver circuit is kept active to prevent malfunction from noise, then system reliability is maintained, but unnecessary power consumption occurs during long storage periods
Solution Approach 1:
The receiver circuit performs brief periodic checks during storage periods rather than maintaining continuous operation. This allows the system to detect noise or interference periodically while minimizing power consumption during extended idle storage periods.
Solution Approach 2:
The control circuit automatically manages the receiver's power state based on detected conditions, switching to power-saving mode when no operations are detected and activating only when needed, eliminating the need for manual intervention or continuous high-power operation.
Data Source
AI summary
A wireless key includes a receiver circuit that operates with a built-in battery, and receives a polling radio wave for wireless key search and authentication from a vehicle, and a transmitter circuit that transmits a lock operation radio wave to a door based on the manipulation on a manipulation device. The wireless key is capable of changing over operation mode between a power saving mode that permits the operation of transmitting the lock operation radio wave by the transmitter circuit and stops the operation of receiving the polling radio wave by the receiving circuit, and a full power mode that permits the operation of transmitting the lock operation radio wave by the transmitter circuit and continues the reception by the receiver circuit.