Passive Induction Emissions Sampler with Flow Control
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Solution Overview
Problem
Current vehicle emissions measuring systems lack accuracy in real-world conditions due to inadequate representation of driving cycles and insufficient accounting for extreme exhaust flow, limiting their effectiveness in assessing actual mass emissions.
Innovation Solution
An improved on-board emissions measuring system featuring a passive induction sampler, processing unit with sensors and a wireless transmitter, and a thermoelectric generator for power, which samples exhaust gases without pumps and provides real-time pollutant measurements, enabling accurate mass emissions calculation across various vehicles without permanent modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive induction sampler is used instead of pump-based sampling, then the system complexity and power requirements are reduced, but the ability to maintain consistent sampling flow under extreme exhaust flow conditions is worsened
Solution Approach 1:
A flow control valve is introduced as an intermediary component between the passive induction sampler and the sensor system. This valve actively regulates the sampled exhaust flow to maintain consistent flow conditions despite variations in extreme exhaust flow, thereby preserving measurement accuracy while still benefiting from the simplified passive sampling approach.
Solution Approach 2:
The system dynamically adjusts the sampling flow parameters by controlling the flow control valve position. This parameter adjustment ensures that the sampled exhaust flow remains within optimal ranges for accurate measurement, even when ambient exhaust flow conditions vary significantly during extreme operating conditions.
2Measurement precision
If multiple sensors are added to measure all pollutant types, then the measurement precision and comprehensiveness are improved, but the device complexity and cost increase
Solution Approach 1:
The system employs a universal sensor platform capable of detecting multiple pollutant types (CO, CO2, NOx, HC) using a single integrated sensor module. This multi-functional approach allows comprehensive emissions monitoring without proportionally increasing device complexity, as the same hardware foundation serves multiple measurement functions.
Solution Approach 2:
The system uses optical copying principles where light interacts with exhaust gases to create measurable signals for multiple pollutant types simultaneously. Spectroscopic methods allow the system to 'copy' the unique spectral signatures of different pollutants and identify them through their characteristic absorption patterns, enabling multi-pollutant detection with a single sensor system.
3Loss of information
If real-time wireless data transmission is implemented, then the data availability and monitoring capability are improved, but the power consumption increases
Solution Approach 1:
The wireless data transmission operates periodically rather than continuously, sending emissions data at predetermined intervals or triggered by specific events. This periodic transmission approach ensures that complete emissions information is captured and transmitted while significantly reducing overall power consumption compared to continuous real-time streaming.
Solution Approach 2:
The system includes onboard data processing and buffering capabilities that allow it to self-manage data transmission. The processor stores data locally and automatically transmits it when power is available or when communication opportunities arise, reducing the need for constant power-intensive active transmission while ensuring data completeness.
4Adaptability or versatility
If the system is designed to accommodate various vehicle types without modification, then the adaptability is improved, but the measurement precision under different exhaust flow conditions may worsen
Solution Approach 1:
The system incorporates dynamic adaptation mechanisms that automatically adjust sampling and measurement parameters based on detected exhaust flow conditions. The flow control valve and processing unit dynamically modify operating parameters to optimize measurement accuracy for each specific vehicle type and exhaust condition, maintaining precision across diverse applications without requiring physical modification.
Solution Approach 2:
The system changes operational parameters such as sampling flow rate, sensor integration time, and transmission frequency based on the specific vehicle and exhaust conditions detected. This parameter adaptation allows the same hardware system to maintain measurement precision across different vehicle types, exhaust flow rates, and operating conditions without requiring physical modification.
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
The system offers precise real-world vehicle emissions measurement, accommodating a wide range of vehicles and operating conditions, ensuring accurate pollutant data collection without displacing vehicles from service, and providing continuous, secure data transmission.
Implementation Method 1
a passive induction sampler (50) configured to sample exhaust from a source (16)
Implementation Method 2
a thermoelectric generator for power
Data Source
AI summary
An improved apparatus for sensing exhaust emissions (15) comprising a passive induction sampler (50) configured to sample exhaust from a source (16), a processing unit (30) connected to the induction sampler and configured to be mounted in close proximity to exhaust from the source, the processing unit comprising an input port (31) adapted to receive flow from the passive induction sampler, an output port (32), a flow path (33) between the input port and the output port, a sensor (34) for sensing one or more pollutants in the flow path, a processor (37) configured to receive measurements from the sensor, a power source (39), and a wireless transmitter (36) connected to the processor.