Estimation of soot oxidation rate in DPF under carbon and non-carbon based particulate matter accumulated condition

Abstract

By high particulate matter(PM) reduction performance, diesel particulate filter(DPF) is applied to almost all of modern HSDI diesel engine. PM emitted from diesel engine is consist of carbon based and non-carbon based material. Representative carbon based PM is soot. Non-carbon based PM is produced by wear of engine and exhaust component,\ud combustion of lubrication oil and sulphur in fuel. Accumulation of non-carbon based PM affects pressure difference of DPF and thus accuracy of soot mass estimation in DPF can be lowered during normal and regeneration condition when the pressure difference caused by non-carbon based PM is not recognized correctly. Also unevenly accumulated PM inside of DPF can produce locally different exhaust gas temperature and thus it can lower accuracy of soot mass estimation during regeneration. This study focuses on estimation of soot oxidation rate not by conventional pressure difference but by exhaust gas analysis at up and downstream of DPF. Results, strong correlations between CO2 -fuel mass ratio and soot oxidation was observed

Fault Diagnosis of the Blocking Diesel Particulate Filter Based on Spectral Analysis

“…DPFs have been used in diesel engine vehicles for over 10 years [4][5][6][7][8][9], since the French Peugeot Company invented the DPF system in 2000. During the use of DPF, with the increase in particulate depositions in the DPF, the exhaust resistance of the diesel engine increases, and blocking the DPF will seriously affect the engine performance (particulate depositions increase to a certain extent).…”

Meachanism and method of DPF regeneration by oxygen radical generated by NTP technology

“…However, there are some problems of these methods of regeneration, such as energy consumption, high cost and thermal damage of the carrier structure (Shim et al, 2013;Chen et al, 2011). Passive regeneration means to achieve regeneration by improving exhaust temperature to reach the minimum combustion temperature of the regeneration without the external auxiliary.…”