The Diesel Particulate Filter (DPF) captures soot particles from diesel exhaust, preventing them from entering the atmosphere. The ECU manages soot load estimation, regeneration strategies, and system monitoring.

Обзор

Soot accumulates in the DPF during normal driving. When soot load reaches a threshold, the ECU initiates regeneration by raising exhaust temperature to burn off accumulated particles.

Controlled Signals

• DPF differential pressure sensor
• Pre-DPF and post-DPF temperature sensors
• Soot load model (calculated)
• Post injection for active regeneration
• Throttle and EGR for temperature control

Maps Involved

• Soot Load Estimation Maps
• Regeneration Trigger Thresholds
• Post Injection Maps (regeneration)
• EGT Target Maps
• Differential Pressure Limits

Logic Sequence

Soot Load Estimation (model-based)
         ↓
Differential Pressure Verification
         ↓
Regeneration Request?
         ↓ YES
Enable Post Injection + Throttle/EGR Adjustment
         ↓
Monitor EGT Until Soot Cleared

Calibration Objectives

• Complete regeneration without driver intervention
• Minimize fuel consumption during regen
• Prevent DPF damage from over-temperature

Calibration Strategy

• DPF delete requires comprehensive ECU modification
• Adjust regeneration intervals if driving patterns change
• Verify differential pressure sensor accuracy

Диагностика

• DPF differential pressure faults
• Regeneration incomplete
• Soot load too high — forced regeneration needed

Best Practices

• DPF removal is illegal for road use in most countries
• Use low-ash oil (ACEA C3) to minimize ash accumulation
• Occasional highway driving helps passive regeneration