Bottom Line
Equipment Update
Meeting the mandate
Older trucks get second chance with aftermarket DPFs

By Land Line staff


With the impending regulations looking to sideline older trucks in California without DPFs, many truckers were looking at a hefty investment in the form of a new truck.

Diesel Emission Technologies may have those truckers breathing a little sigh of relief and even a little easier with their aftermarket diesel particulate filters.

The company offers a stand-alone DPF called Smart Trap. The on-board system uses diesel to heat the DPF. It has a control module, which monitors one or more sensors that measure exhaust back pressure and temperature.

The module senses when it is time to activate a regeneration cycle to burn the trapped particulate matter.

Diesel is injected into the exhaust stream before it reaches a diesel oxidation catalyst that increases the exhaust temperature before the filter. The higher temperature burns the soot that’s in the exhaust, making it into inorganic compounds that are trapped within the filter walls.

The stand-alone unit is just like its factory installed counterparts in its need for occasional cleaning. Engine and fuel oil ash builds up on the surface of the inlet face of the filter, and will eventually clog the pores. The clogging in turn increases backpressure within the DPF and the exhaust system.

The company stresses on its Web site that “it is vital that a DPF is maintained inline with our directive.”

The warning goes on to say that if the unit is not maintained, then the exhaust back pressure will increase and the engine will use more fuel. As the back pressure increases, the temperature will also increase, which may affect engine condition and run the risk of permanently damaging the DPF.

For information on Smart Trap visit LL