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Direction Plus is one of New Zealand’s leading brands for supplying reliable and quality, parts and accessories for diesel based passenger, 4×4, industrial power and heavy/light commercial vehicles.
What is a DPF?
A Diesel Particulate Filter (DPF) is a device designed to remove diesel particulate matter or soot from the exhaust. Unlike a Catalytic Converter, a DPF is not a flow through device. Exhaust gases are cleaned by passing through the walls of the DPF leaving particulate matter to accumulate on the inlet face of the DPF. Once the DPF particulates reach a certain level it must be cleaned. This is achieved through filter “regeneration”, where the soot particles are burnt off at high temperatures.
The DPF needs to be cleaned regularly, through a process called regeneration, either active, active with additives or passive regeneration.
Passive regeneration generally takes place where exhaust temperatures are higher. The DPF is constantly cleaned through a catalyst process when the vehicle is driven at a certain speed or length of time.
When the DPF reaches a predetermined level (usually 45% capacity), the ECU will make small adjustments to the fuel injection timing system to increase exhaust temperature to initiate the regeneration process. In order to reach this temperature the vehicle must be driven for a certain time period at a minimum speed. If frequent stop/ start driving takes place the opportunity does (Does or does not?) exist for the vehicle to regenerate the DPF. In this case a warning light will illuminate on the dash to advise that the DPF is partially full. The vehicle will need to be taken for a drive and required conditions to regenerate the DPF. If the DPF becomes too full to perform a regeneration on its own, the DPF will have to undergo a “”forced” regeneration with the use of a specialised diagnostic tool. When a DPF becomes 90% blocked, it is no longer able to be regenerated and will have to be replaced.
Active Regeneration with Additives
As per Active Regeneration but with the aid of an additive called ‘EOLYS™’ which is injected into the exhaust to lower the temperature required to perform the regeneration. This is most commonly found in Citroen and Peugeot vehicles.
DPF Failure Causes:
• Poor engine maintenance
• Malfunctioning pressure sensor / pipes
• Faulty temperature sensors
• Incorrect oil temperature
• Faulty EGR valve
• Damaged exhaust system
• Corrosion / fractures
• Incorrect fuel
• Short runs (lack of temperature)