Journal Article
The Legislative Impact of New Particle Number Standards on the DPF Operational Efficiency
2010-04-12
2010-01-0536
On September 1 st 2011, the Euro 5 + emission legislation will apply to passenger cars in Europe. It is characterized by the introduction of a new regulation concerning the number of soot particle emissions, whereas Euro5 legislation only applies to soot mass. This new regulation makes it necessary to investigate the impact of filter design on filtration efficiency as it pertains to particle number and to the Diesel Particulate Filter (DPF) operating window. This paper describes the investigation performed on a light duty test bench equipped with a Differential Mobility Spectrometer (DMS) which measures soot concentration number and soot particle size distribution in the exhaust gas effluent. Specific protocols were developed to be able to evaluate filtration efficiency in particle number when the DPF is empty of soot and also when the filter is soot loaded. Several DPF parameters such as filter length, filter diameter, cell geometry, and microstructure were studied.
