Diesel Progress North American

EMISSIONS TECHNOLOGY
A schematic of the field test site at Fontana Wholesale Lumber. Along with the Continental
Controls Corp. EGC 4 electronic carburetor, other components include a new DCL catalyst
and a data acquisition system that monitored temperatures and pressures as well as NOx
and CO emissions from more than 25 sensors and other inputs on and around the engine.

number of CO excursions was greatly reduced. The system was generally meeting the SCAQMD R1110.2 standards in the short term.

One of the objectives was to make
it possible for the equipment to contin-
ue to maintain compliance for months
at a time without having to be tested
and adjusted by a technician. To
achieve this, CCC developed a cata-
lyst monitoring system that included
support via CANbus for a NOx sensor
downstream of the catalyst. By using
feedback from the NOx sensor, the
system could automatically readjust
the setpoint in the oxygen sensor
control in the AFR. This intelligent and
dynamic feedback to the AFR repre-
sented a significant breakthrough in
technology because it signifies a true
closed-loop function that can auto-
matically find and readjust the oxygen
sensor setpoint to keep emissions at
the lowest possible point.

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