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diesel particulate filter
A diesel particulate filter (or DPF) is a device designed to remove diesel particulate matter or soot from the exhaust gas of a diesel engine.〔Tom Nash (May 2003) "Diesels: The Smoke is clearing", ''Motor'' Vol.199 No.5 p.54, Hearst Business Publishing Inc.〕〔
==Mode of action==
Wall-flow diesel particulate filters usually remove 85% or more of the soot, and under certain conditions can attain soot removal efficiencies approaching 100%. Some filters are single-use, intended for disposal and replacement once full of accumulated ash. Others are designed to burn off the accumulated particulate either passively through the use of a catalyst or by active means such as a fuel burner which heats the filter to soot combustion temperatures. This is accomplished by engine programming to run (when the filter is full) in a manner that elevates exhaust temperature, in conjunction with an extra fuel injector in the exhaust stream that injects fuel to react with a catalyst element to burn off accumulated soot and convert it to ash where it is stored in the DPF filter,〔Jong Hun Kim ''et al.'' (November 2010) "NO2-Assisted Soot Regeneration Behavior in a Diesel Particulate Filter with Heavy-Duty Diesel Exhaust Gases", ''Numerical Heat Transfer'' Part A Vol.58 No.9 pp.725–739, Chonbuk National University, Korea 〕 or through other methods. This is known as "filter regeneration". Cleaning is also required as part of periodic maintenance, and it must be done carefully to avoid damaging the filter. Failure of fuel injectors or turbochargers resulting in contamination of the filter with raw diesel or engine oil can also necessitate cleaning.〔("DPF Maintenance" (January 2010) HDT Trucking Info )〕 The regeneration process occurs at road speeds higher than can generally be attained on city streets; vehicles driven exclusively at low speeds in urban traffic can require periodic trips at higher speeds to clean out the DPF.〔("Diesel dilemma" (7 Nov 2011) BBC News )〕 If the driver ignores the warning light and waits too long to operate the vehicle above , the DPF may not regenerate properly, and continued operation past that point may spoil the DPF completely so it must be replaced.〔("DPFs reduce diesel soot emissions by 80% but they're not suitable for everyone" ) (5 December 2013) The Automobile Association〕 Some newer diesel engines, namely those installed in combination vehicles, can also perform what is called a Parked Regeneration, where the engine increases RPM to around 1400 while parked, to increase the temperature of the exhaust.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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