Vehicle Motion Sensor Arming via RF Pulse Detection
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Solution Overview
Problem
Current vehicle theft recovery systems require notification of unauthorized movement before they can initiate tracking and recovery operations, leading to delays in alerting the owner and potentially extending the time before recovery can commence.
Innovation Solution
A method utilizing in-vehicle acceleration sensors that monitor for periodic radio-frequency pulse transmissions from an authorized source, arming or disarming based on their presence or absence, and sending a wireless alarm message upon unauthorized vehicle motion detection, with energy-saving features to conserve battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acceleration sensors are continuously activated to detect unauthorized vehicle movement, then detection reliability is improved, but energy consumption increases
Solution Approach 1:
The system performs preliminary arming of the acceleration sensors when the vehicle is parked and secured, preparing the detection mechanism in advance. The sensors are activated before potential theft occurs, ensuring immediate detection capability while allowing periodic sleep modes to conserve energy during normal stationary periods.
Solution Approach 2:
The acceleration sensor system dynamically adjusts its operational state between active monitoring, periodic sampling, and sleep modes based on vehicle status and detected motion levels. This dynamic operation allows the system to maintain detection reliability when needed while minimizing energy consumption during normal operation.
2Loss of time
If the system remains in constant monitoring mode to detect theft quickly, then response time is improved, but battery power is depleted faster
Solution Approach 1:
The system employs periodic monitoring cycles where acceleration sensors take measurements at intervals rather than continuously. During normal stationary periods, the sensors enter sleep modes with periodic wake-up cycles to check for motion. This periodic operation maintains the ability to detect theft quickly while significantly reducing battery power consumption compared to continuous monitoring.
3Reliability
If false alarms are minimized by setting high motion detection thresholds, then alarm reliability is improved, but detection sensitivity decreases
Solution Approach 1:
The system transitions from single-axis motion detection to three-dimensional acceleration sensing using orthogonal-axis microprocessor-controlled accelerometer sensors. By detecting motion components along three perpendicular axes (X, Y, and Z), the system can distinguish between normal vehicle movements and actual theft attempts more accurately, maintaining high detection sensitivity while minimizing false alarms through multi-dimensional analysis.
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 reduces the time to alert the owner of unauthorized vehicle movement, potentially shortening the undetected theft time and enhancing the efficiency of vehicle recovery operations by providing early warning and reducing the time required for police intervention.
Implementation Method 1
monitoring the presence or absence of predetermined periodic radio-frequency pulse transmissions from an authorized source in the vicinity of the vehicle; in the event that such transmissions are present, receiving the transmissions in the vehicle and disarming or de-activating the acceleration sensors; in the absence of such reception, arming or activating the acceleration sensors in the vehicle to test for any acceleration of the vehicle
Implementation Method 2
sending a wireless alarm message to a host communication system for so informing the vehicle owner
Data Source
AI summary
An improved motion sensing and alarm technique and apparatus for monitoring unauthorized movement of vehicles or the like and notifying the owner thereof, wherein the motion sensors in the vehicle are microprocessor controlled to be automatically armed when the owner is not in the vicinity of the vehicle, but disarmed or de-activated in the presence of the owner and the owner's radio-coded identification transmitter associated with the owner's key fob, and with energy saving features as well.