Impact of cordierite partial flow particulate filter on a light-duty diesel vehicle thermal efficiency and partide emission

Name: Dang Quang Huy

LCSH: Motor vehicles -- Motors(Diesel)

LCSH: Motor vehicles -- Fuel consumption

Abstract: The stringent emission regulations raise significant concerns regarding harmful gases and particles emitted from diesel vehicle exhaust, adversely affecting human health and the environment. This study investigates the impact of a cordierite partial- flow diesel particulate filter (P-DPF) on a light-duty diesel vehicle's thermal efficiency and emission characteristics. The evaluation utilizes commercial fuel BIO and biodiesel B100 to assess the feasibility of P-DPF for an aged untreated diesel vehicle. The filter’s microstructure is inspected using scanning electron microscopy to better understand the characteristics of its substrate. Subsequently, two test setups are conducted on chassis dynamometers: steady-state engine conditions and the new European driving cycle (NEDC) to compare the results with and without P-DPF. The initial test involves testing the vehicle to assess fuel flow rate, brake thermal efficiency, and exhaust emissions at three engine speeds: 1500, 2000, and 2500 rpm, corresponding to four loads: 84, 112, 140, and 160 Nm. The second test evaluates emission factors of regulated pollutants under the NEDC. Analysis shows that the filter's substrate is made of cordierite with a porosity of 66%, while the catalyst material is ceria-zirconia oxide. The pore sizes range mainly from 3-20 pm, with a mean pore size of 14 pm. Installation of P-DPF has a minimal impact on the fuel flow rate due to low backpressure, increasing by 1.6% and 0.5% with B10 and B100, respectively Meanwhile, brake thermal efficiency decreases no more than 0.7%. A significant reduction in smoke intensity is observed when P-DPF is installed, with a decrease of over 57% for both fuels. Analysis of NO, C02, 02, and exhaust gas temperature suggests that simultaneous trapping and passive soot oxidation may occur inside the P-DPF through reactions of N02 and 02 with soot at appropriate temperatures. Particulate matter is significantly reduced when P-DPF is installed under NEDC. In particular, particulate number is reduced by 36%, while particulate mass is reduced by 59%. These reductions are attributed to the filtration mechanism of P-DPF that partially traps particulate matter inside the porous walls while allowing the remaining flow through the open channels. Moreover, the catalytic coating within P-DPF reduces CO by up to 20% and total HC by 22%. Installation of P-DPF demonstrates a practical approach to reducing harmful and toxic emissions in older diesel vehicles that lack an after-treatment system with minimal modifications

King Mongkut's Institute of Technology Ladkrabang. KMITL Lifelong Learning Center

Address: BANGKOK

Email: lifelong@kmitl.ac.th

Name: Mek Srilomsak

Role: Thesis Advisor

Name: Sompong Srimanosaowapak

Role: Thesis Co-Advisor

Name: Hidenori Kosaka

Role: Thesis Co-Advisor

Modified: 2025-10-02

Issued: 2025-10-02

วิทยานิพนธ์/Thesis

application/pdf

eng

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