Officials with Cat Engines, a division of Caterpillar, announced that refinements to their ACERT technology will be the foundation of their '07 technology during a presentation at the Mid-America Trucking Show in Louisville, KY.
Speaking to media and industry leaders Wednesday, March 22, they said Cat will continue to use ACERT technology and were adamant that it is the technology that works best when it comes to meeting new emission standards.
In describing the enhancements to their technology, Cat officials said in order to help ACERT meet the more stringent '07 regs from the Environmental Protection Agency, two major refinements are in place:
- A refined combustion process called Clean Gas Induction, or CGI, has been added; and
- A self-regenerating diesel particulate filter, or DPF, has been developed to further decrease emissions.
CGI is a proprietary ACERT technology process that draws off a small amount of non-combustible gas after it passes through the engine's after-treatment system. The gas is then cooled, blended with additional incoming cool, clean air, and returned to the combustion chamber.
Greg Gauger, director of Cat's on-highway power systems, said it comes down to using clean air to make cleaner exhaust.
"Rather than reintroducing dirty exhaust into the system, CGI simply uses additional cool, clean air to reduce combustion temperatures and achieve the necessary reduction in NOx and particulate matter," said Gauger.
Gauger said using clean air is what makes Cat's technology different from other EGR systems, or exhaust-gas recirculation systems, which send exhaust back through the system.
In addition to the CGI enhancement, Cat officials explained how their new diesel particulate filter, or DPF, further reduces problematic emissions.
All engine manufacturers will be required to include some form of the DPF to meet '07 emission regs, but Cat's new DPF design uses wall-flow technology - a ceramic brick substrate allowing the particulate matter to be captured in the cells of the wall.
The Cat DPF not only catches more of the bad stuff, but it is also easier to clean than other filters. The ash that collects in the DPF needs to be removed periodically to ensure top performance, and the Cat DPF has a special ash-collection tool for easy cleanout.
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