Stratégie de contrôle du boost

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

Boost pressure regulation is a core task of modern diesel and gasoline ECUs (EDC17, MD1, MG1). Target boost depends on torque demand, air mass requirements and multiple safety strategies.

Vue d'ensemble

The ECU computes boost target based on torque request and engine airflow requirements, then regulates via VGT actuator or wastegate.

Controlled Signals

  • MAP / MAF sensors
  • Turbo speed (when equipped)
  • VGT actuator or wastegate duty
  • EGT models

Maps Involved

  • Boost Target vs RPM/load
  • Boost Limiters (absolute & atmospheric)
  • Turbo Speed Limiters
  • EGT Model Maps
  • PID Control Maps

Strategy Logic

Torque Request → Airflow Model → Boost Target
         ↓
Limiter Checks (Turbo speed / EGT / Pressure ratio)
         ↓
PID Control → VGT/WG Actuator

Calibration Strategy

  • Increase target only after correcting torque & smoke model
  • Avoid exceeding turbo speed calculated limits
  • Check EGT rise under high load
  • Reduce WG/VGT oscillation adjusting PID maps

Diagnostics

  • P0235/P0236 boost deviation
  • Turbo speed overshoot → protection active
  • VGT calibration faults

Best Practices

  • Smooth air path → smooth torque
  • Blend torque/airflow/smoke models before touching boost

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