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Diesel Particulate Filter (DPF)

The mechanism of DPF is filtering PM through a wall.

DPF' mechanism is illustrated in the processes as follows:

1. As shown in the chart 1, the ends of alternate filter channels are plugged and the PM (Particulate Matter, mostly consist of black smoke, soot) in the exhaust gas is trapped as it is forced through the filter wall.

2. The accumulated PM inside the filter is periodically burned away by high-temperature exhaust heat.

The mechanism of DPF

One advantage of using silicon carbide is the ability to trap a high amount of PM.

Advantages of using silicon carbide (SiC) are (1) high heat resistance and (2) high thermal conductivity. DPF, however, is designed to burn the trapped PM using fuel, which can affect fuel economy. For this reason, the number of burnings must be reduced by trapping as much PM as possible and burning it all off at once.
SiC offers high heat resistance, and conducts heat quickly throughout the entire filter, which is effective when burning of accumulated PM.

The mechanism of DPF

Tighter controls on European emission standards and spread of on-board DPFs

The 21st century is seeing an ever-increasing focus on environmental problems across the world, for which emission controls have been further strengthened in Europe. In the Euro 4 European emission standards, implemented in 2005, the amount of PM emitted from diesel vehicles was restricted to 0.025 g/km or less, contributing to an increased number of passenger cars equipped with DPFs.
In Euro 5 European emission standards, executed in September 2009, the acceptable limit of PM emissions was lowered to 0.005 g/km. As a result, today almost all diesel passenger cars in Europe are equipped with DPFs.

DPF cumulative world shipments exceed 20 million units, with further demand for DPFs expected to expand among large vehicles and emerging countries

IBIDENís SiC-DPFs, commercialized ahead of global competitors, has been adopted by worldwide automobile manufacturers for its superior properties, and the cumulative shipment of DPFs exceeded 20 million units. Further demand for DPFs is expected to increase in the market of large vehicles such as trucks, buses and construction vehicles as well as in emerging countries, in line with stricter control of environmental regulations. Furthermore, tighter controls are expected on not only PM emissions but also nitrogen oxide (NOx) emissions. IBIDEN will proceed with comprehensive proposals for the full range of automotive exhaust system components including catalyst carriers for NOx treatment and substrate holding mats (MATs) as well as DPFs.

We go forward with the technology, which is one step ahead of others, in the DPF market expected for future expansion.

The filtration efficiency of our DPF already meets the next European emission standards,which is Euro 5. Furthermore, DPF for compact cars is restricted for mounting location, requiring downsizing DPF as well as strengthening against vibrations.
To comply with such requirements and minimizing fuel penalty, we continue developing and offering innovate DPF. Standards are being fortified not only in Europe but also in the USA and Asia, making DPF needs stronger.

IBIDEN, as a leading company of DPF, will continue to propose forefront technologies while improving customer satisfaction.