Abstract
Exhaust aftertreatment to reduce particulates has been developing for about 20 years. Devices to retain particulates, termed soot traps or diesel particulates filters, are generally known as DPFs. The paper reviews DPF technology, and its use for existing vehicles retrofit) or new vehicles (as original equipment). The performance of DPF systems is examined. DPF systems were tested using passenger cars: a DPF with catalytic surface (CSF), CSF combined with fuel borne catalyst(FBC), and also a plain DPF using FBC. All these systems ave potential for retrofit application, but poor low temperature regeneration produced excessive accumulation with the CSF.