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Methodology of diesel particulate filter testing on test bed for non-road engine application

This paper describes the methodology and test results of diesel particulate filter (DPF) functional testing performed on non-road compression ignition engine application installed on test bed. The scope of work included testing of various DPF regeneration strategies, backpressure and balance point tests, emission performance evaluation under legislative cycle. The aim of this study was to observe and investigate the influence of raw exhaust gas parameters on DPF functionality in terms of filtration efficiency, soot loading, type and duration of the regeneration and emission performance. Under investigation was the capability of soot burning rate and fuel penalty. The DPF sample under test was part of the complete exhaust aftertreatment system (ATS) which consisted of: diesel oxidation catalyst (DOC), DPF and the selective catalytic reduction system (SCR) with urea dosing. Testing was carried out on heavy-duty diesel engine installed on a test with dynamic dynamometer and equipped with emission bench.Test program allowed to assess the engine matching to exhaust aftertreatment system with regard to emission compliance, in service operation and necessary engine control unit (ECU) calibration works. The results shown the influence of DPF regeneration strategy on the duration and soot mass burn rate. Passive DPF regeneration was a favorable mode of DPF cleaning due to lack of fuel penalty and lower aging impact on the entire ATS. An optimization of soot flow rate, exhaust gas temperature and the chemistry of DOC, DPF was further recommended to ensure long-life durability of the entire system.
Topic: Exhaust emissions and aftertreatment
Author: Rafał Sala
Co-authors: Kamil Kołek, Witold Konior