Three-Level Motion Detector for Key Fob Power Optimization
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Solution Overview
Problem
Remote keyless entry devices face challenges in managing battery life due to unnecessary wireless signal emission during user movement, leading to increased current consumption when the user is far from the intended object or location.
Innovation Solution
A remote access device equipped with a wireless transmitter and an accelerometer that transitions between operating modes based on detected motion states, emitting signals only when the user is approaching or leaving the object, thereby reducing power consumption by avoiding continuous signal transmission during motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automatic wireless signal emission is enabled for user convenience, then access is provided when the user approaches the physical object or location, but current consumption increases
Solution Approach 1:
The system dynamically adjusts the wireless transmitter's operating mode based on real-time motion detection. The accelerometer continuously monitors motion states, and the controller transitions between first operating mode (low power, no transmission) and second operating mode (high power, active transmission) according to detected motion patterns, optimizing the balance between convenience and energy consumption
Solution Approach 2:
The system changes operational parameters by switching between different operating modes of the wireless transmitter. In the first operating mode, the transmitter remains inactive to conserve energy. In the second operating mode, the transmitter actively emits signals when motion is detected, providing automatic access functionality. This parameter switching resolves the contradiction by adapting energy consumption to actual usage needs
2Ease of operation
If wireless signals are emitted when motion exceeds a certain threshold, then automatic access is improved, but current consumption increases during periods when the user is moving and far away
Solution Approach 1:
The system employs feedback from the accelerometer to continuously monitor and assess the user's motion state. The controller receives real-time motion data and uses this feedback to determine whether to activate the wireless transmitter. This feedback mechanism ensures that energy is only consumed when actual access-related motion is detected, preventing wasteful energy expenditure during distant or irrelevant movement
Solution Approach 2:
The system dynamically responds to changing motion conditions by transitioning between operating modes. When the accelerometer detects motion patterns indicating the user is approaching or interacting with the protected object, the system switches to the second operating mode for signal transmission. When motion subsides or indicates the user is moving away, the system returns to the first operating mode, eliminating energy waste during non-access-related movement
3Reliability
If continuous wireless signal transmission is used to ensure access, then reliability of access is improved, but battery life decreases
Solution Approach 1:
Instead of continuous transmission, the system uses periodic action by activating the wireless transmitter only during specific periods when motion is detected. The accelerometer monitors for motion events, and the controller periodically switches the transmitter between inactive (first operating mode) and active (second operating mode) states. This periodic activation maintains access reliability when needed while significantly extending battery life by avoiding continuous energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces power consumption by limiting wireless signal emission to periods when the user is near the object, enhancing battery life and user convenience while maintaining secure access.
Implementation Method 1
an accelerometer configured to detect a first change in motion states of the remote access device between a first motion state and a second motion state, detect a second change in motion states of the remote access device between the second motion state and the third motion state, detect a third change in motion states of the remote access device between the first motion state and the third motion state
Data Source
AI summary
A remote access device and methods of operation thereof are provided for accessing a physical object or location. The remote access device includes an accelerometer, a wireless transmitter, and control circuitry. The control circuitry causes the wireless transmitter to transition between a first operating mode and a second operating mode in response to receiving signals from the accelerometer indicating a first change in motion states of the remote access device. The control circuitry causes the wireless transmitter to transition between a first operating mode and a second operating mode in response to receiving signals from the accelerometer indicating a second change in motion states of the remote access device. The control circuitry further causes the wireless transmitter to transition between the first operating mode and the second operating mode in response to receiving signals from the accelerometer indicating a third change in motion states of the remote access device.