Exhaust Obstruction Detection via Differential Pressure
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Solution Overview
Problem
Motor vehicle exhaust systems can become obstructed, leading to dangerous carbon monoxide buildup, which conventional safety systems fail to address effectively due to temperature fluctuations and false alarms from exhaust fumes entering the vehicle.
Innovation Solution
An obstruction detecting system using a differential pressure sensor, logic device, relays, and a motor to alert occupants with visual and audible alarms and automatically lower windows to reduce carbon monoxide exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a carbon monoxide detector is installed in a motor vehicle, then carbon monoxide presence can be detected, but the device may not tolerate extreme temperature fluctuations and can produce false alarms from exhaust fumes
Solution Approach 1:
The patent uses a differential pressure sensor as an intermediary device to detect exhaust system obstructions indirectly, rather than directly detecting carbon monoxide. This mediator approach avoids the problems of temperature sensitivity and false alarms from exhaust fumes, as the pressure sensor only detects pressure differentials caused by blockages, not the chemical composition or temperature of the gases.
2Reliability
If conventional alarms are installed on the control panel, then occupants inside the vehicle can be alerted, but occupants outside the vehicle cannot see or hear the alarm
Solution Approach 1:
The patent enhances the alarm system's universality by adding a strobe light that emits visible flashes from the exterior of the vehicle. This allows the alarm to effectively communicate with occupants in multiple positions - both inside the vehicle (audible alarm) and outside the vehicle (visible strobe light), making the safety system adaptable to various occupancy scenarios.
3Reliability
If exhaust systems are obstructed, then carbon monoxide can be converted by catalytic converter, but blockage causes gases to bypass the catalytic converter and escape
Solution Approach 1:
The patent implements preliminary detection of exhaust system obstructions using a differential pressure sensor before carbon monoxide can accumulate to dangerous levels. By detecting the pressure differential caused by blockages in advance, the system can alert occupants and activate the window motor to prevent carbon monoxide buildup, rather than waiting for the catalytic converter to fail.
4Reliability
If a differential pressure sensor is used to detect obstructions, then early warning can be provided, but the system complexity increases with additional components
Solution Approach 1:
The patent employs a self-service approach where the exhaust system's own pressure differential serves as the detection signal. The differential pressure sensor utilizes the natural pressure difference that exists between the exhaust system and ambient environment when a blockage occurs, requiring no additional power source or complex processing. This minimizes system complexity while maintaining reliable detection capability.
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
Effectively alerts occupants to exhaust system obstructions, reducing the risk of carbon monoxide poisoning by providing a comprehensive alert system that includes automatic window lowering.
Implementation Method 1
The obstruction detecting system determines whether an exhaust pipe system has an obstruction or a partial obstruction at the open end of the pipe by detecting a change in air pressure
Data Source
AI summary
An obstruction detecting system for identifying the existence of an obstruction or a partial obstruction in or at the opening of a motor vehicle exhaust pipe. The obstruction detecting system may include a sensor having the ability to detect an obstruction or a partial obstruction in a motor vehicle exhaust system. The obstruction detecting system may include a logic device, a plurality of relays, an alarm, and a motor. The obstruction detecting system may be contained in a housing that is capable of being mounted in or near a motor vehicle exhaust system. When the obstruction detecting system senses an obstruction or a partial obstruction in or at the opening of the exhaust pipe, the system may send an electrical signal to an alarm, which may be a visual alarm, an audible alarm, or both. The alarm may be located in the vehicle control panel, and may alert the operator and passengers of a motor vehicle of an obstruction or a partial obstruction in or at the opening of a motor vehicle exhaust pipe, when the motor is operating. The obstruction detecting system may send an electrical signal to a motor for the purpose of lowering a window in a motor vehicle.