Curriculum
- 6 Sections
- 28 Lessons
- 1 Day
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- 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 NO₂ 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
Why NOx is harmful – smog, acid rain, ozone formation
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