What is the function of the Diesel Particulate Filter (DPF) in the ATD?

What is the function of the Diesel Particulate Filter (DPF) in the ATD?

• A. Eliminates NOx in exhaust
• B. Increases exhaust backpressure to reduce emissions
• C. Lubricates engine oil
• D. Traps particulate matter

Answer: (D)

The Diesel Particulate Filter is designed to trap soot and other particulate matter from diesel exhaust before it leaves the system. It uses a porous filter material that captures PM as exhaust passes through, helping to keep soot out of the air. Over time the filter fills, so the system performs a regeneration process to burn off the accumulated soot at high temperature, either passively or actively, to keep flow open and maintain emissions performance. This function targets particulate emissions, not NOx, lubrication, or anything else. Increased backpressure can happen as the filter loads, but that's a side effect rather than the purpose; NOx reduction is handled by separate systems, and the filter itself does not lubricate oil.

The Diesel Particulate Filter is designed to trap soot and other particulate matter from diesel exhaust before it leaves the system. It uses a porous filter material that captures PM as exhaust passes through, helping to keep soot out of the air. Over time the filter fills, so the system performs a regeneration process to burn off the accumulated soot at high temperature, either passively or actively, to keep flow open and maintain emissions performance. This function targets particulate emissions, not NOx, lubrication, or anything else. Increased backpressure can happen as the filter loads, but that's a side effect rather than the purpose; NOx reduction is handled by separate systems, and the filter itself does not lubricate oil.