Browse Publications Technical Papers 2007-01-1127
2007-04-16

Control Strategies for Peak Temperature Limitation in DPF Regeneration Supported by Validated Modeling 2007-01-1127

One of the main challenges in developing cost-effective diesel particulate filters is to guarantee a thermally safe regeneration under all possible conditions on the road. Uncontrolled regenerations occur when the soot reaction rate is so high that the cooling effect of the incoming exhaust gas is insufficient to keep the temperature below the required limit for material integrity. These conditions occur when the engine switches to idle while the filter is already hot enough to initiate soot oxidation, typically following engine operation at high torque and speed or active filter regeneration.
The purpose of this work is to investigate engine management techniques to reduce the reaction rate during typical failure mode regenerations. A purely experimental investigation faces many difficulties, especially regarding measurement accuracy, repeatability in filter soot loading, and repeatability in the regeneration protocol. Therefore, the present study is guided by advanced regeneration modeling, which is supported for calibration and validation purposes by careful experimental measurements on the engine bench.
The study covers both uncoated and catalyzed filters. The model used is a previously developed and validated 3-dimensional regeneration model including heterogeneous catalytic reactions for all types of coatings, including NOx storage functionality. The engine management techniques for peak temperature limitation involve engine speed, air path and injection control during the idle mode. Experiments are performed with and without protection measures to verify the model agreement in both conditions. In a next step, the validated model is used to study the acceptable soot mass limit for various calibrations of control measures.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Soot Loading Distribution as a Key Factor for a Reliable DPF System: An Innovative Development Methodology

2002-01-2158

View Details

TECHNICAL PAPER

Exhaust Hydrocarbon Speciation from a Single-Cylinder Compression Ignition Engine Operating with In-Cylinder Blending of Gasoline and Diesel Fuels

2012-01-0683

View Details

JOURNAL ARTICLE

On-Board Particulate Filter Failure Prevention and Failure Diagnostics Using Radio Frequency Sensing

2017-01-0950

View Details

X