Caterpillar Inc has submitted its October 2002 heavy-duty engine product line for Environmental Protection Agency certification. The improved Cat engines will use aftertreatment, which is achieved through a proprietary Caterpillar technology called a diesel oxidation catalyst. This system lowers emissions by converting carbon monoxide and unburned hydrocarbon in the diesel exhaust to water vapor and carbon dioxide. The catalyst has no moving parts, operates at normal exhaust temperatures, and the outer shell is constructed from stainless steel. The technology also lowers vehicle noise levels.

All engine ratings will use a Caterpillar diesel oxidation catalyst in a configuration determined by the truck manufacturer. Configurations can consist of either single or dual mufflers combined with a catalyst or independent catalytic converter. Each chassis is engineered with the appropriate catalyst for the installed engine.

Diesel oxidation catalysts were first introduced on Cat mid-range engines in 1994 and continue to be an integral component on the 3126E Clean Power engine. The technology for October 2002 engines is essentially the same as for mid-range engines, sized for the C-10, C-12, and C-15.

The enhanced technology incorporated on these engines includes building blocks of Caterpillar's Advanced Combustion Emissions Reduction Technology (ACERT). ACERT technology combines breakthrough combustion technology with advanced fuel and air systems technologies, new integrated Cat electronics, and an aftertreatment system. ACERT will meet emissions regulations up through 2006 and is a foundation for meeting future emissions regulations.