Title

An independent controller for active diesel exhaust aftertreatment.

Date of Award

2005

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

Keywords

Engineering, Mechanical.

Rights

CC BY-NC-ND 4.0

Abstract

An independent controller was proposed to perform real-time diagnosis and modeling based control for diesel aftertreatment devices, such as the diesel particulate filters (DPF) and the lean NOx traps (LNT). The diesel aftertreatment devices for this research were in active flow control configuration. As opposed to passive aftertreatment control where the engine tailors the raw exhaust conditions, in active aftertreatment configuration, the raw exhaust conditions were modified with independent controls, such as aftertreatment temperature control, exhaust flow control, and aftertreatment excess air/fuel ratio (A) control. The determination of the diesel engine transient exhaust gas temperature is essential for effective active flow aftertreatment control schemes. To overcome the slow response of the high-inertia thermocouples used in the harsh diesel exhaust environment, a temperature response model was developed as part of this research. The temperature response model was verified by tests conducted on a Yanmar NFD170 single cylinder diesel engine setup. The model was then implemented into a National Instrument PCI-6023E multifunction data acquisition board with LabVIEW. The LabVIEW program was tested on the Yanmar engine setup and was capable of estimating the transient exhaust gas temperature in real-time using the temperature data obtained from two high-inertia thermocouples with a proper diameter ratio. The simplified transient aftertreatment model representing the regeneration behavior of the DPF and the performance of the LNT were also proposed. (Abstract shortened by UMI.) Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2005 .W88. Source: Masters Abstracts International, Volume: 44-03, page: 1499. Thesis (M.A.Sc.)--University of Windsor (Canada), 2005.