Program Overview
This program provides a comprehensive, industry-grade understanding of how NOx is formed in internal combustion engines and how it can be effectively managed across engine and aftertreatment systems. Participants explore combustion fundamentals, engine-variable influences, NOx–PM tradeoffs, SCR/LNT conversion behaviour, and real-world failure patterns typically encountered in BS-VI/Euro-VI environments. Through case studies, diagnostic exercises, and data-based simulations, attendees learn to interpret NOx trends, identify root causes, and apply calibration/hardware countermeasures to resolve real operational challenges. The course blends conceptual depth with practical engineering insight, ensuring direct application to participants’ current product and field issues.
Features
- Understand the combustion and chemical mechanisms behind NOx formation in SI/CI engines
- Diagnose NOx spikes by interpreting engine variable behaviour, calibration changes, and air-path dynamics
- Assess aftertreatment system performance and identify efficiency losses in SCR, LNT, DOC, and DPF systems
- Apply practical root-cause and countermeasure strategies to resolve real-world NOx compliance and field issues
Target audiences
- Engine development engineers
- Aftertreatment & emissions engineers
- Calibration, OBD & diagnostics engineers
- R&D, validation & testing engineers
- Quality, warranty & field service engineering teams
Curriculum
- 6 Sections
- 28 Lessons
- 1 Day
- Foundations of NOx Emission Formation in Engines5
- NOx Formation in Real-World Engine Operation5
- 2.1Thermal NOx, Prompt NOx, Fuel NOx
- 2.2Ignition delay, local temperature pockets, and swirling air motion
- 2.3Effect of injection timing, rail pressure, AFR, boost and combustion duration
- 2.4NOx-soot tradeoff: Why reducing NOx often increases PM
- 2.5Scenario based learning: EGR failure; Turbocharger performance drop; Cooled EGR fouling
- Effect of Engine Variables on NOx Emissions – Deep Situational Awareness5
- 3.1Air–path drivers: EGR rate, EGR cooler performance, deposit formation; Boost pressure & VGT control
- 3.2Combustion drivers: SOI/EOI; Injection dwell & rate shaping; Pilot and post injection effects
- 3.3Fuel properties, cetane, and spray quality
- 3.4Transient-cycle behaviour (WLTC, WHTC)
- 3.5OEM case studies of abnormal NOx rise during accelerations & hot-restarts
- NOx Aftertreatment – SCR, LNT & Emission Treatment Pathways5
- 4.1SCR chemistry, NH₃ storage, conversion window
- 4.2LNT (Lean NOx Trap) functionality
- 4.3DOC/DPF effects on NOâ‚‚ formation (impact on SCR efficiency)
- 4.4Real-world SCR limitations: Catalyst aging; Low-temperature operation; Urea crystal formation; Ammonia slip
- 4.5System-level optimisation: Engine-out NOx vs tailpipe NOx
- Real-World Case Studies: Diagnosis & Troubleshooting NOx Issues5
- 5.1Case Study: EGR cooler clogging – NOx exceedance in WLTC
- 5.2SCR efficiency dip at low loads
- 5.3Calibration drift – NOx increase post 30k km
- 5.4High transient NOx due to turbo lag
- 5.5Engine-out NOx vs tailpipe NOx analysis; Catalyst temperature mapping; NOx conversion curve reading; Root-cause – countermeasure mapping
- Mini Project: Solve a NOx Failure3
Instructor
