Diesel particulate filter (DPF) introduction

Carbon diesel particulate filter (diesel particulate filter, abbreviated as DPF) the role is to collect the role of capturing the diesel combustion exhaust gas, and filtered carbon particles. When capturing more carbon particles to some extent, ECU OBD computer will be “filter regeneration” within the carbon particulate filter burn into carbon dioxide discharged to maintain purifying filter filtering.

In short,  diesel particulate filter carbon is an automatically heated filter that combined with three-way catalytic converter, it can reduce smoke emission diesel combustion. Because of the physical characteristics of diesel engine emissions, truck or car will discharge of black smoke containing soot, so it play a role that give us a conventional diesel stereotype is the “squid car.” With environmental consciousness and technology development, diesel vehicles in the installation of such devices can significantly reduce smoke, to comply with environmental regulations. After all diesel combustion carbon fine particles generated by the device will be blocked and temporarily stored, and then use the heat engine emissions will be stored in the filter carbon fine particles within the combustion decomposition, and oxidation to carbon dioxide and vented through the exhaust system.

Emission diesel engines mainly produces the following several substances:

A gaseous fuel combustion in insufficient oxygen produced:

Carbon monoxide (carbon monoxide, called CO).

Hydrocarbons (hydrocarbons, referred HC): a compound consisting of carbon and hydrogen collectively formed. It refers to the fuel or lubricating oil in the cylinder without burning, or compounds, fuel vapor, etc. generated by the decomposition of carbon and hydrogen.

NOx (oxides of nitrogen, abbreviated NOx): Nitrogen gas within the cylinder formed by oxidation at high temperatures, mainly a mixture of nitric oxide and nitrogen dioxide formed.

Particulate matter (particulate matter, called PM): discharge of various solid particles in general, usually including heavy metal compounds, sulfates, soot particles SOF dissolved organic matter, the appearance wrapped in oil and other liquid particles.

Combustion carbon fine particles are not always carrying out the action, but the use of the exhaust gas pressure sensor to detect its storage capacity. When you reach saturation, ECU OBDII computer will send a signal a “filter regeneration” to increase engine operating temperature, using high-temperature exhaust gas (about 600 ℃ to 650 ℃) generated by the combustion engine,it is stored in the filter carbon fine particles. And the driver does not receive from the dashboard to any warnings, or feel any burning action. The current global car factory for the “filter regeneration” approach include: electric heating, fuel injection combustion, diesel fuel burners, carbon and install diesel particulate filter can effectively reduce HC, CO, PM, three pollutants emissions.

Similar As catalytic converters, in principle, this filter does not need to be cleaned or replaced regularly, unless the fault damaged. But the driver’s driving habits (short or infrequent use on the highway), or stop and go driving environment dictates, may cause engine can not burn itself carbon fine particles. Suppose this situation, can the Commission please Repairer technicians use computer programs, the implementation of a carbon fine particle combustion in the filter inside the store.

 

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