Vehicle Rear Occupant Alert System Using Door and Ignition Sensors
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Solution Overview
Problem
Existing vehicle safety systems fail to effectively alert operators about the presence of rear occupants, including children, pets, or objects, in parked vehicles, as they rely on weight-responsive switches that may not be available or functional in all scenarios.
Innovation Solution
A safety arrangement using door sensors and an ignition sensor to automatically activate an audible alarm when the rear door is open for a predetermined time and the ignition is turned off, ensuring a fail-safe alert mechanism that does not rely on weight-responsive systems, with manual override options and a microprocessor-controlled alert system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weight-responsive switches are used in child safety seats, then the system can detect the presence of children, but the system fails when children do not use safety seats or when pets are left in vehicles
Solution Approach 1:
The system uses door sensors and ignition sensors that work universally for all vehicle occupants regardless of whether they are children, pets, or objects. The door sensor detects when a rear door is opened, and the ignition sensor detects when the vehicle is turned off, providing universal detection capability that does not depend on the presence or type of occupant.
Solution Approach 2:
The system introduces door sensors and ignition sensors as intermediary detection mechanisms instead of relying directly on weight detection. These sensors mediate the detection process by monitoring door opening events and ignition state changes, which are reliable indicators of occupant presence regardless of the occupant type.
2Reliability
If child safety seats with weight-responsive switches are used, then detection can be provided, but the system is not fail-safe as it can be easily circumvented
Solution Approach 1:
The system automatically activates itself based on door and ignition sensor inputs without requiring manual configuration or installation in safety seats. The microprocessor automatically processes sensor signals and triggers the alarm, providing a self-service fail-safe mechanism that cannot be circumvented by removing safety seats.
3Reliability
If an alarm system is activated, then operators are alerted to remove rear occupants, but the alarm may cause distraction or annoyance if activated incorrectly
Solution Approach 1:
The system performs preliminary detection using door and ignition sensors to determine the appropriate alarm activation conditions before triggering the alarm. By checking whether the rear door was opened and the ignition was turned off, the system ensures the alarm is activated only under appropriate circumstances, preventing false alarms and operator annoyance.
Data Source
AI summary
A safety arrangement for alerting an operator of a parked vehicle having an ignition and rear doors that a rear occupant, e.g., a child, is still present in a rear of the vehicle, includes door sensors for detecting when either rear door is open or closed, an ignition sensor for detecting when the ignition is activated or deactivated, a programmed controller responsive to each door sensor and the ignition sensor, for automatically activating the arrangement when either rear door has been opened for a predetermined time period, and for generating an alert signal in response to detection that the ignition has been activated, followed by subsequent detection that the ignition has been deactivated, and an alarm responsive to generation of the alert signal for alerting the operator to remove the rear occupant from the parked vehicle.