Passive Regeneration is the regeneration method that cleans the DPF under normal engine operation and does not require operator interactions.

• A. Passive Regeneration
• B. Active Regeneration
• C. Automatic Regeneration
• D. Parked Regeneration

Answer: (A)

Soot buildup in the diesel particulate filter (DPF) needs to be burned off, and regeneration is how that happens. Passive regeneration occurs automatically during normal driving when the exhaust temperature is naturally high enough due to engine load and road conditions. Because the engine and exhaust do the work, no action from the operator is required. This contrasts with other methods that need driver intervention or special conditions, such as actively heating the exhaust with extra fuel or running a long heat cycle while the vehicle is parked. So, the description fits passive regeneration: it cleans the DPF during regular operation without any driver input.