Engine speed during parked regeneration is what?

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Prepare for the City of Miami Fire Department Driver-Engineer Exam. Review multiple choice questions with hints and explanations. Succeed on your test!

Multiple Choice

Engine speed during parked regeneration is what?

Explanation:
During parked regeneration, the engine is run at a higher idle to raise exhaust gas temperatures enough to burn off soot in the diesel particulate filter. Holding the engine around 1600 rpm provides the necessary heat reliably without pushing the engine to excessive RPM. This is done with the vehicle stationary and the parking brake applied, and it typically lasts several minutes. Slower idle speeds won’t reach the required temperature, while much higher RPMs aren’t needed and waste fuel.

During parked regeneration, the engine is run at a higher idle to raise exhaust gas temperatures enough to burn off soot in the diesel particulate filter. Holding the engine around 1600 rpm provides the necessary heat reliably without pushing the engine to excessive RPM. This is done with the vehicle stationary and the parking brake applied, and it typically lasts several minutes. Slower idle speeds won’t reach the required temperature, while much higher RPMs aren’t needed and waste fuel.

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