If parked Regen is not performed, the engine derate percentage is what?

If parked Regen is not performed, the engine derate percentage is what?

• A. 10%
• B. 25%
• C. 50%
• D. 75%

Answer: (B)

Parked regeneration is the process used to burn off soot in the diesel particulate filter while the engine is stationary. If that regen is not performed, the engine control system applies a 25% derate, reducing engine output to 75% of its maximum. This derate protects the aftertreatment system by keeping exhaust temperatures in a safe range when regeneration isn’t being completed. It strikes a balance between keeping the vehicle usable and protecting the emissions hardware. A smaller derate wouldn’t provide enough protection, while a larger one would overly restrict performance during critical operations.

Parked regeneration is the process used to burn off soot in the diesel particulate filter while the engine is stationary. If that regen is not performed, the engine control system applies a 25% derate, reducing engine output to 75% of its maximum. This derate protects the aftertreatment system by keeping exhaust temperatures in a safe range when regeneration isn’t being completed. It strikes a balance between keeping the vehicle usable and protecting the emissions hardware. A smaller derate wouldn’t provide enough protection, while a larger one would overly restrict performance during critical operations.