Host: The Japan Society of Mechanical Engineers
Name : Dynamics and Design Conference 2016
Date : August 23, 2016 - August 26, 2016
As environmental regulations become stricter, diesel engines must become cleaner. Hence, in addition to combustion control, aftertreatment of the exhaust is important to reduce emissions involving NOX and diesel particulate matter (DPM). The response speed of the current NOX sensor is too slow to follow transient operations. In this paper, a new NOX adaptive soft-sensor for aftertreatment of diesel engines is described. NOX soft-sensor is tuned on-line by gradient method that uses analytical sensitivity. NOX soft-sensor is filtered in consideration of the hard-sensor dynamics that are approximately one second delay and primary delay, and NOX soft-sensor is optimized for minimizing error between NOX soft-sensor and hard-sensor responses. Its basic characteristics are evaluated through simulations using measured data with a diesel engine test bench.