Emissions Strategy Overview (DPF / EGR / SCR)

🧠 Part of the TuningBot ECU Knowledge Base — in-depth documentation on ECU logic, maps, emissions systems and safe calibration methods.

Modern vehicles use multiple emissions control systems working together. Understanding how these systems interact is essential for proper calibration.

Diesel Architecture

Engine → DOC → DPF → SCR → Tailpipe
  • DOC — oxidizes HC and CO
  • DPF — captures particulate matter
  • SCR — reduces NOx with AdBlue

EGR Function

Recirculates exhaust to reduce combustion temperature and NOx formation. Trade-off: too much EGR increases PM.

System Interactions

  • EGR vs SCR balance
  • Timing vs PM trade-off
  • DPF regen vs SCR temperature

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