Tako zgleda očitno pri modernem avtu
The start of Diesel Particulate Filter (DPF) regeneration is primarily triggered by two main factors, depending on the type of regeneration:
1. The Main Trigger: Soot Load in the Filter (For Active Regeneration)
The most common trigger for regeneration is when the DPF becomes full of trapped soot.
- Soot Accumulation: The DPF captures soot from the engine's exhaust. A differential pressure sensor measures the pressure difference before and after the filter. As the filter fills up with soot, the pressure difference (or "back-pressure") increases.
- Engine Control Unit (ECU) Threshold: When the soot load reaches a pre-determined level (often around 45% full), the vehicle's ECU detects the increased back-pressure and automatically initiates an Active Regeneration cycle to burn the soot off.
- Warning Light: On many vehicles, if passive regeneration is not possible and the soot load is too high for the vehicle to clean itself under current driving conditions, a DPF warning light will illuminate on the dashboard, signaling the need for the driver to take action (usually by driving at highway speeds).
2. The Conditions for Passive Regeneration (Self-Cleaning)
Passive regeneration is the continuous self-cleaning process that happens naturally when certain conditions are met:
- High Exhaust Temperature: The soot burns off when the exhaust temperature is high enough, typically between 350∘C and 500∘C.
- Sustained Driving: This temperature is usually achieved during longer journeys on the highway or at higher road speeds (e.g., above 60 km/h or 40 mph) and under a high enough engine load.
If your normal driving pattern (e.g., city driving, short trips) doesn't allow the exhaust to get hot enough for passive regeneration, the soot will build up until the ECU forces an
active regeneration.