Micro-PEMS Based on OBD and MOX Sensors

Area of Science:

• Environmental Science
• Automotive Engineering
• Sensor Technology

Background:

• The EURO 7 regulation requires continuous monitoring of vehicle emissions during real driving.
• Existing portable emissions monitoring systems (PEMS) can be expensive and complex.
• Accurate measurement of tailpipe emissions (NOx, CO, CO2) is crucial for environmental protection.

Purpose of the Study:

• To develop a cost-effective micro portable emissions monitoring system (µPEMS).
• To enable near-continuous monitoring of key pollutant gases from vehicle exhausts.
• To meet the stringent requirements of the EURO 7 regulation.

Main Methods:

• Integration of low-cost Metal Oxide Semiconductor (MOX) sensors in the exhaust pipe.
• Utilizing vehicle On-Board Diagnostics (OBD) for engine operation data.
• Addressing challenges such as sensor drift, cross-sensitivity, and sampling frequency variations.

Main Results:

• The µPEMS prototype demonstrated high correlation (R² > 0.87) with established PEMS.
• Successful testing across gasoline, diesel, and hybrid vehicles under real driving conditions.
• Validated the system's capability to monitor NOx, CO, and CO2 mass emissions.

Conclusions:

• The developed µPEMS offers a viable alternative for vehicular emission regulation.
• Provides real-time data crucial for enhancing ecodriving strategies and vehicle technologies.
• Contributes valuable data for national emission inventories and environmental policy.