Valley Freightliner, Sterling and
Western Star Trucks of Cleveland
4985 W. 150th. St.
Brookpark, Ohio 44135
216-267-4800
888-560-8782

The Enviromental Protection Agency (EPA) has mandated
that all engines built after 12/31/06 must reduce the level of
Nitrogen Oxide and other particulate matter below current
levels. The Nitrogen Oxides (NOx) exhaust by the engine
will be limited to just over 1.0 grams per brake horsepower hour
(g/bhp-hr). Particulate matter (PM) cannot exceed .01g/bhp-hr.

NOx will be reduced by increasing the percentage levels of
exhaust gas recirculation (EGR) and, in some installations,
with the addition of a diesel oxidation catalyst (DOC). PM,
made of soot and ash will be reduced through the use of a
diesel particulate filter (DPF). Both the DPF, and when required,
the DOC will be housed in an After-treatment Device (ATD).

The ATD is a ceramic canister that replaces the muffler. It houses a
Cordierite ceramic substrate brick called a diesel particulate
filter (DPF) and, if required by the engine manufacturer,
another substrate brick called a diesel oxidation catalyst (DOC).
An exhaust passes through the ATD, the DOC oxidizes
hydrocarbons and reduces NOx and the DPF traps PM.

Per EPA mandate the ash must be cleaned from the DPF,
no more than every 150,000 miles or 4,000 to 6,000
hours of service. Soot is also collected in the ATD but is
converted to basic elements and a small amout of ash by
an event called Regeneration.

There are two type of Regeneration - Passive and Active.
Both involve a temperature increase within the ATD.

Passive Regeneration takes place inside the ATD
when temperatures 300-degrees Celsius. The process is ongoing
when the truck is being driven an exhaust gas temperatures are
no higher than normal.

Active Regeneration occurs when the inside temperature of the
ATD reaches 600-degrees Celsius. The process is achieved by
diesel fuel passing through the DOC or by igniting diesel fuel
with a burner. The two basic types of active regeneration are:

• Active In-Transit Regeneration- Truck is traveling at speeds
  greater the 20 mile per hour. Discontinued under 10 mph.
• Stationary Active Regeneration - Truck is parked and
  in neutral. Driver or maintenance technician performs
  necessary tasks.

 Ultra Low Sulfur Diesel (ULSD) Fuel and Low ash Engine Oils
will be required.

Available in the fall of 2006, ULSD is 15-ppm diesel fuel that
can be used in all diesel engines, has the same level of lubricity,
but will have slightly less energy than fuel currently used.

Low ash engine oils will also be usable in all diesel engines.
Because burnt oil is the primary source of ash in the exhaust of
a truck, low ash engine oils will contain less than 1% ash.

The ATD will only be availabe in a chassis mounted
configuration. All of the piping will now be stainless steel and
a stainless steel bellows will replace the strip-wound flex pipe
between the turbocharger and the ATD.

The distance between the turbo and the ATD is important to
maintain the exhaust temperatures required for a passive
regeneration. This piping is part of the EPA certification and
should not be altered.

Piping between the ATD and the exhaust pipe is also critical
due to higher exhaust gas temperatures and increased back-
pressure and should only be modified using specific guidelines.

2007 Engine Innovations
We've added two new enhancements: the Clean Gas Induction process and the Cat Diesel Particulate Filter, with its own Cat Regeneration System. read more...

Western Star EPA '07 Seminar Series. Read more...

Cummins ISC EPA-07 Overview Read more...

Detroit Diesel EPA '07 Update Bulletin Read more...