Key Fob Power Compensation for Hand Interference and Low Battery
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Solution Overview
Problem
Remote keyless entry systems experience reduced range due to human hand interference and declining battery power, leading to operator dissatisfaction.
Innovation Solution
The key fob includes sensors to detect human presence and adjust output power levels, using feedback mechanisms to compensate for interference and battery state, optimizing communication parameters such as time-to-sleep mode and data rate to maintain effective communication with the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fob operates at regulated power level in free space, then compliance with federal regulation is achieved, but range is reduced when human hand interferes with transmission
Solution Approach 1:
The system dynamically adjusts the output power level based on detected operating conditions. Sensors detect whether a human hand is proximate to the fob, and the controller automatically increases power above the regulated level when hand interference is detected, maintaining compliance while extending effective range.
Solution Approach 2:
The system changes the power level parameter from the fixed regulated level to a variable level that adapts to operating conditions. When hand interference is detected, the power level parameter is adjusted upward to compensate for the interference and maintain effective communication range.
2Length of moving object
If output power is increased to compensate for hand interference, then range is maintained, but energy consumption increases
Solution Approach 1:
The system uses dynamic power adjustment rather than continuously operating at high power. The controller monitors sensor inputs in real-time and only increases power when hand interference is actually detected, reducing overall energy consumption while maintaining range when needed.
Solution Approach 2:
The power level parameter is changed from a static high level to a conditionally adjusted level. The system transitions between power states based on detected conditions, consuming higher power only when necessary to maintain range during hand interference events.
3Reliability
If sensors and feedback mechanisms are added to detect hand presence and adjust power, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The system implements a feedback loop where sensors detect hand presence and transmit this information to the controller, which then adjusts power levels accordingly. This automated feedback mechanism improves communication reliability by responding to actual operating conditions without requiring complex manual intervention.
Solution Approach 2:
The fob automatically detects and compensates for hand interference without user intervention. The sensor and controller work together to self-adjust power levels based on detected conditions, eliminating the need for manual power setting or complex user interaction while maintaining communication reliability.
Data Source
AI summary
A method comprising for adjusting a power level in a key fob includes transmitting a first output signal at a first power setting. A feedback signal is received via a feedback mechanism that indicates a first power level of the first output signal. The first output level is compared to a threshold level. A second output signal at a second power setting greater than the first power setting is transmitted if the first output power level is below the threshold.