22 April 2005

The California Air Resources Board (ARB) has verified the Johnson Matthey Exhaust Gas Recirculation Technology™ (EGRT™)—a combination of an exhaust gas recirculation (EGR) system and a diesel particulate filter—to achieve an 85% reduction in PM emissions and 40% reduction in NOx.

The EGRT™ system utilizes the Johnson Matthey CRT filter and a retrofit EGR system developed by the Sweden’s STT Emtec. It is a low pressure loop EGR, where the recirculated gas stream is drawn from downstream of the particulate filter and, thus, is cleaned from particulate matter.

The verification is valid for selected Cummins, Detroit Diesel, and International model year 2000 and 2001 engines used in on-road applications and operated with ultra low sulfur fuel.

Source: California ARB (executive order | engine families)