Motion-Activated Wireless Vehicle Key for Low-Power Connectivity
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Solution Overview
Problem
Current wireless keys for vehicles require high energy consumption, necessitating large batteries and limiting the development of small, smart fobs.
Innovation Solution
A wireless key with a sensor for motion detection and an evaluation unit that switches a transceiver between operating and sleep modes based on movement detection, reducing energy consumption by adopting an advertising role and disconnecting when idle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transceiver continuously operates in wireless key mode, then reliable vehicle unlocking and function enabling are achieved, but energy consumption increases and battery life decreases
Solution Approach 1:
The transceiver dynamically switches between operating modes (active, sleep, deep sleep) based on motion detection and connection status. The system adapts its energy consumption characteristics to match actual operational needs, transitioning from high-power continuous operation to low-power standby states when no motion is detected.
Solution Approach 2:
The system employs periodic motion detection intervals to determine whether to maintain active transceiver operation or transition to sleep modes. Instead of continuous monitoring, the system checks for motion at predetermined intervals, enabling energy-efficient periodic operation while maintaining reliable vehicle access functionality.
2Speed
If the transceiver operates in high-power mode continuously, then quick connection establishment is possible, but battery size must be large
Solution Approach 1:
The transceiver dynamically adjusts its operational state based on actual needs. When quick connection is needed (motion detected), it activates high-power mode for rapid communication. When no motion is detected, it transitions to low-power modes, eliminating the need for continuously large battery capacity.
Solution Approach 2:
The system changes operational parameters (power consumption level, transmission activity) based on motion detection results. By varying these parameters dynamically rather than maintaining fixed high-power operation, the battery size requirement is reduced while preserving quick connection capability when needed.
3Duration of action of stationary object
If the transceiver enters deep sleep mode to save energy, then battery life extends, but connection re-establishment time increases
Solution Approach 1:
The sleep behavior is segmented into multiple levels: light sleep mode and deep sleep mode. The system can choose appropriate sleep depth based on conditions, balancing energy savings with reactivation speed. This segmentation allows optimization of both battery life and connection re-establishment time.
Solution Approach 2:
The transceiver dynamically selects between different sleep modes and active states based on motion detection patterns and connection history. This dynamic state management optimizes the trade-off between energy conservation and quick reconnection, adapting to actual usage scenarios rather than using fixed sleep behavior.
Data Source
AI summary
A wireless key (1) for unlocking a vehicle and/or for enabling a function of the vehicle. The wireless key (1) has a sensor (10) for motion detection, an evaluation unit (20), and a transceiver (30) which is designed to signal its availability as a connection partner and to wirelessly transmit data to a connection partner and/or to receive data from the connection partner. The transceiver (30) has at least one operating mode (A, B) and at least one sleep mode (C, D) where an energy requirement of the transceiver (30) is lower than in the at least one operating mode (A, B). The evaluation unit (20) is designed to switch the transceiver from the operating mode (A, B) to the sleep mode (C, D) if no movement is detected by the sensor (10) within a predetermined interval and to switch the transceiver (30) from the sleep mode (C, D) to the operating mode (A, B) if a movement is detected by the sensor (10).