Curbing Nitrogen Oxides (NOx) Using PEMS, iPEMS, and Micro-PEMS

By Globalmrv

Updated 2 January 2024

A truck with gas emissions coming from it's tailpipes

Reducing nitrogen oxide (NOx) emissions from internal combustion engines (ICE) is a critical concern in addressing air quality and environmental impact. In recent years, the world has placed a growing emphasis on employing advanced technologies — such as In-Use Portable Emission Measurement Systems (iPEMs), Portable Emission Measurement Systems (PEMS), and Micro-PEMs — to achieve more accurate and real-world emissions control.

If you’re wondering how to reduce — and better monitor and measure — the amount of nitrogen oxide pollutants in the air, join us! This blog post will explore various techniques and strategies to mitigate NOx emissions via innovative, traditional, in-use, and micro PEMS technologies.

Understanding the NOx Challenge

Employing effective emission reduction techniques is imperative to address rampant air pollution. NOx emissions — comprising nitrogen oxide and nitrogen dioxide — are major contributors to air pollution. 

These noxious gasses have adverse effects on our health and the environment. Internal combustion engines — particularly in vehicles — are significant sources of NOx emissions.

The following six portable emissions measurement systems (PEMS) techniques and strategies can help you reduce nitrogen oxides.

1. iPEMs in action

In-use Portable Emission Measurement Systems (iPEMs) play a pivotal role in real-world emissions monitoring. These systems are capable of measuring emissions under actual operating conditions.

Plus, they provide valuable data for researchers and engineers.

Utilizing iPEMs allows for a comprehensive understanding of NOx emission patterns during different driving scenarios. Best of all, iPEMS enable the development of targeted mitigation strategies for reducing NOx emissions.

2. PEMS technology

Portable Emission Measurement Systems (PEMS) are another key player to help reduce NOx emissions. PEMS mobile devices are attached to vehicles during regular operation, offering insights into emissions during various driving conditions.

PEMS technology facilitates on-road emission testing, enables researchers to identify emission peaks, and helps teams optimize engine performance accordingly.

3. Micro-PEMs advancements

Micro-PEMs, a more compact version of traditional PEMS, bring a new level of precision to emissions monitoring. These miniature devices are highly sensitive and allow for real-time measurement of NOx emissions.

The integration of Micro-PEMs enables continuous monitoring, offering instant feedback for emission control strategies and adjustments.

4. Advanced combustion techniques

Optimizing combustion processes is fundamental to NOx reduction. Techniques — such as lean-burn combustion, exhaust gas recirculation (EGR), and staged combustion — help control peak temperatures and minimize the formation of nitrogen oxides.

Combining the above-mentioned techniques with data from iPEMs, PEMS, and Micro-PEMs allows for a more holistic approach to emission reduction.

5. Selective Catalytic Reduction (SCR)

SCR systems involve injecting a urea-based solution into an exhaust stream to convert NOx into harmless nitrogen and water. Integrating SCR technology — in conjunction with accurate emission measurement systems — ensures effective NOx reduction and helps users maintain engine efficiency.

6. Engine calibration and control

Precise engine calibration and control strategies are essential for two reasons: these strategies help achieve optimal combustion and minimize NOx emissions. Continuous monitoring with iPEMs, PEMS, and Micro-PEMs facilitates dynamic adjustments to engine parameters.

The ability to adjust engine parameters helps ensure compliance with emission standards in real-world driving conditions.

GlobalMRV: Data-driven solutions for complex problems

Reducing NOx emissions from internal combustion engines requires that we take a multi-faceted approach. Leveraging advanced measurement systems — like iPEMs, PEMS, and Micro-PEMs —provides crucial insights for developing and implementing effective emissions mitigation strategies.

Combining these technologies with advanced combustion techniques, SCR systems, and meticulous engine calibration is key to achieving substantial and sustainable NOx reduction. With the right solutions, business and teams can lead the charge in contributing to a cleaner and healthier environment.

At GlobalMRV, we’ve collected and analyzed tens of thousands of hours of reliable data for clients of all different industries and niches. Our partnerships of Ph.D. researchers, managers, analysts, engineers, and technicians have run more than 60 different types of diagnostic testing regimes, supported over 100 different vehicles and engines, and saved companies millions on traditional dynamometer and real driving emissions (RDE) testing. To get started with PEMS, contact us today.

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