DPF regeneration strategy in long-distance driving scenarios

1. High speed cruise triggers automatic regeneration

When the vehicle continues to drive at a speed of over 80km/h, the ECU will detect the DPF differential pressure sensor data. If the carbon deposition exceeds 15g/L, the system will automatically enter the regeneration program:

Fuel injection strategy: The rear injection system injects 0.5-1ml of diesel every 10 seconds into the exhaust manifold

Temperature control: DOC (oxidation catalyst) raises the exhaust temperature to 600-650 ℃

Regeneration time: about 15-20 minutes to complete a single cycle

Actual test data: During a long-distance test on the Sichuan Tibet Highway, when the vehicle was cruising at 90km/h, the DPF indicator light automatically turned off after driving 120 kilometers, and the residual particulate matter decreased from 18g/L to 3g/L.

2. Enhanced regeneration effect of mountainous roads

In mountainous areas above 2000 meters above sea level, the decrease in air density leads to a decrease in combustion efficiency, but regeneration can be optimized through the following operations:

Manual downshift: Keep the engine speed above 2500rpm

Slope driving: using downhill inertia to maintain exhaust temperature

Intermittent S-bend: Increasing engine load through steering

Case verification: On the section from Shangri La to Daocheng Yading, after adopting the above strategy, the DPF regeneration interval was extended from 350 kilometers to 580 kilometers.