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Technical Paper

Experimental Study of DPF Loading and Incomplete Regeneration

2007-09-16
2007-24-0094
It is well known that diesel particulate filters can be subjected to incomplete regeneration which can lead to DFP failure when a severe regeneration follows several partial regenerations. The following study concentrates on C-DPF (Catalyzed Diesel Particulate Filter) filters made of R-SiC (Re-crystallized Silicon Carbide) from Saint-Gobain and aims at studying the spatial soot distribution in the filter as a function of soot loading and regeneration efficiency. The soot distribution is deduced from a radial velocity profile at the rear of the filter which is measured using a specific test bench. In this work, an experimental protocol is designed to produce a controlled partial regeneration. This protocol allows the desired regeneration efficiency to be obtained. It can be observed that the better the regeneration efficiency is, the more the radial distribution of remaining soot in the filter is homogeneous. Consequently, regeneration is more efficient where the filter is more loaded.
Technical Paper

A Model for Residual Gas Fraction Prediction in Spark Ignition Engines

2002-05-06
2002-01-1735
To meet future pollutant emissions standards, it is crucial to be able to estimate the cycle by cycle composition of the combustion chamber charge. This charge consists of fresh air, fuel and residual gas from the previous cycle. Unfortunately, the residual gas fraction cannot be directly measured. Therefore, a model of residual gas fraction as a function of engine parameters and operating parameters has been developed. The model has been calibrated with exhaust pipe hydrocarbon measurements using a successive dilution method.
Technical Paper

Residual Gas Fraction Measurement in Spark Ignition Engines

2005-09-11
2005-24-078
To meet future pollutant emissions standards, it is crucial to be able to estimate the composition of the combustion chamber charge on a cycle by cycle basis. This charge consists of fresh air, fuel and residual gas from the previous cycle. Unfortunately, the residual gas fraction cannot be directly measured. Therefore, a model of residual gas fraction as a function of engine parameters and operating parameters has been developed. The model has been calibrated with exhaust pipe hydrocarbon measurements using a successive dilution method.
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