The ACIS-3 Lite Open Loop Control system utilizes engine load and exhaust temperature to determine the required urea flow rate to satisfy the NOx limit. It continuously monitors urea injection rate and compares to the desired rate and adjusts accordingly. The ACIS-3 is now also available as a Closed-Loop system with NOx monitoring capability.
Operator interface is via a powerful yet simple HMI with graphical representation of the entire emission system. An operator can see at a glance critical operating information such as temperatures, injection rate, exhaust pressure, etc.
ACIS-II (Closed-Loop Control)
The ACIS-II Closed-Loop Control system has an on-board measurement of post-SCR NOx values, which it then uses to adjust urea injection to constantly achieve a specific NOx target. NOx targets of 5 ppm or lower, with concurrent low ammonia slip, can be maintained with the ACIS-II control system.
Like the ACIS-3, the ACIS-II has a powerful HMI which makes monitoring and setting up the system simple.