At present, V1OTDI Ouchuan with engine emission standards, the public company in Frankfurt auto show that they began to lV do not meet European standards of motor vehicles (about 5 O%) are fitted with particulate trap DPF, to meet the European IV. Last year, the Passat car at the bottom with a particulate trap system, which is the shell of steel materials, filter of a silicon carbide materials, with intake and exhaust channel. Inlet channel to collect carbon deposition, only emissions through porous ceramic wall into the exhaust channel. Filter in the filter process, to gather up the carbon deposition in the 500 �� at Shaojin. To be able to lower the temperature in the case under the conditions of combustion particles and reduce Huifen, add an iron diesel additives.

Bosch developed by the particulate trap, the material is sintered metal, and ceramic materials used now different. This new structure of the particulate deposition is very uniform, filter to filter again, the process is very simple. They also conducted two other studies, is a fuel additive, and the other is coated with catalytic converters, the two methods should be used to filter the exhaust filter again.