Portable Device Search Controller Low-Power State Transition
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Solution Overview
Problem
Existing portable device searching technologies consume excessive battery power due to periodic searches, leading to premature termination of searches when the number of occurrences decreases, which compromises the ability to detect the user reaching the vehicle.
Innovation Solution
A portable device searching device and method that includes a transmitter, receiver, and controller, where the controller transitions to a low-power consumption state after transmitting search information and returns to normal operation only upon authentication confirmation, reducing power usage without decreasing the frequency of searches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic searching for portable device is performed, then user detection capability is maintained, but battery power is consumed excessively
Solution Approach 1:
The system performs periodic searching at predetermined time intervals instead of continuous searching. The controller transitions to a low-power consumption state after each search operation and only returns to normal operation when authentication information is received, thereby maintaining user detection capability while significantly reducing battery power consumption.
2Duration of action of stationary object
If search frequency is reduced to save power, then battery life is extended, but user detection reliability decreases
Solution Approach 1:
The system maintains predetermined time intervals for searches to ensure user detection reliability while reducing overall power consumption. The controller strategically transitions to low-power state after each search, balancing battery life extension with maintained search frequency.
Solution Approach 2:
The controller dynamically adjusts its operational state based on the search cycle. It transitions between normal operation state during active searching and low-power consumption state during waiting periods, optimizing the balance between detection reliability and power consumption.
3Loss of time
If continuous monitoring is performed, then authentication response is detected promptly, but power consumption increases
Solution Approach 1:
The controller periodically checks for authentication information after transmitting search information, rather than continuously monitoring. It transitions to low-power state after sending search information and only wakes up to check for responses at predetermined intervals, reducing power consumption while still detecting authentication responses in a timely manner.
Data Source
AI summary
A portable device searching device includes a transmitter that transmits search information to a search area near a vehicle to search for a portable device, a receiver that receives authentication information returned from the portable device as a response to the search information, and a controller that controls the transmitter and the receiver. The receiver includes an authentication portion to authenticate the portable device based on the authentication information and notifies the controller of an authentication result. The controller performs control to transmit the search information in a normal operation state, subsequently transitions to a low-power consumption state, and returns from the low-power consumption state to the normal operation state when notified of the authentication result from the receiver.