Reducing Emissions
2007 EPA guidelines require a significant reduction in diesel exhaust emissions. In fact, current acceptable emissions are approaching zero. This positive change for the environment has created a challenge for engine manufacturers—but Detroit Diesel gladly took the challenge head on. Just what you'd expect from a leader.
To meet the goals, we enhanced our Exhaust Gas Recirculation (EGR) system and developed an innovative Aftertreatment System—both contribute to a significant reduction in exhaust emissions.
Fewer Emissions
EGR
A small amount of exhaust gas is re-circulated back into the intake manifold to dilute the incoming air/fuel mixture. An innovative EGR cooler ensures that temperatures stay in the range that helps reduce the formation of NOx gases.
The 2007 EGR system enhancements include a high-capacity tube-and-shell EGR cooler that is more durable than our previous model.
We've also moved the EGR valve to cool side of the engine on the Series 60—just like we've always done on the MBE 4000. This proven placement means much more efficient EGR operation.
Active Regeneration
When required, DDEC VI gets this help from two key upstream components that assist in a process called active regeneration. The first is the Intake Throttle, which is electronically actuated to help increase the Aftertreatment System temperature—helping regeneration. The second is the Dosing Valve, which injects a mist of diesel fuel into the exhaust system to further increase the Aftertreatment System temperature until satisfactory regeneration is complete. This process of active regeneration takes about 20 minutes and happens during the normal operation cycle of the vehicle. No manual performance or control changes are necessary.
The Aftertreatment System
Our new 2007 Aftertreatment System contains several interacting components that function as an integrated system—all controlled by the proven power of the Detroit Diesel Electronic Control (DDEC).
The workhorse behind our clean emissions technology is the exhaust Aftertreatment System, which replaces today's muffler. The primary function of this device is to capture and burn off (regenerate) the particulate matter (soot) in the engine exhaust gas—it does this using a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF). Through constant monitoring of exhaust gas temperature and system back pressure, DDEC VI is able to determine when and how additional help is needed to ensure complete regeneration of all the soot captured in the DPF.
Maintenance
Maintaining your Aftertreatment System is easy—we designed it to be. The Diesel Particulate Filter (DPF) collects ash from engine exhaust and eventually needs to be replaced. The DDEC system carefully monitors the ash accumulation and, if regular proactive maintenance is not performed, will alert the driver that DPF replacement is required. For most vehicle applications and duty cycles, DPF replacement is required every 150,000 to 550,000 miles of operation.
Stationary Regeneration
In some specific applications or engine duty cycles, DDEC VI may not be capable of completing active regeneration. In this case, the operator will be notified that —stationary— regeneration may be required. A DPF dash lamp will indicate the need for user interaction. The lamp gives the operator a grace period to allow this process to take place at a time when most convenient for the operator. After the driver begins the forced high idle regeneration process, it is completed in 20-30 minutes.
This same system and all its functions will be applied to the entire line up of new, exciting and environmentally friendly 2007 Detroit Diesel engines.
ULSD
Aftertreatment Systems need diesel fuel with Sulfur content below 15ppm. Always check, but know that most fuel sold today in North America will not foul or prematurely plug the Diesel Particulate Filter. Using the proper fuel is not only important to ensuring your Aftertreatment System functions properly, but also to lowering emissions.
Cleaning the Diesel Particulate Filter (DPF)
The DPF is easily removed by your dealer from the Aftertreatment Device, cleaned and replaced. The entire service process only takes about 45 minutes.
But what if the DPF needs more extensive service? That's where the reliabilt® Reman Exchange program comes in. Your DPF will be replaced with our signature reliabilt® brand, while the old core is sent back to our factory for a proprietary, environmentally friendly extensive washing service.
CJ-4
Using the proper engine oil is also important to ensuring your engine and Aftertreatment System achieves the best maintenance intervals. TodayÕs current CI-4+ engine oil contains a sulphated ash level of up to 2%. In 2007, oil manufacturers began producing a new oil formulation (CJ-4) with 1.0 wt % sulfated ash to help extend the maintenance cycles for the Diesel Particulate Filter.