SOUTHWEST RESEARCH INSTITUTE

Powertrain
Control

U.S. Tier, II Bin 5 Demonstration Vehicle

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	The SwRI-developed RPECS™, used extensively in test cell developmental applications, was used in this program.


	Graphs showing comparison of data used in this study

A U.S. Tier II, Bin 5 demonstration vehicle was developed by Southwest Research Institute (SwRI) engineers to demonstrate U.S. Tier II, Bin 5 compliance.

An airflow-dominant control system was developed to provide precise engine and exhaust treatment control with low air fuel ratio alternative combustion. The main elements of the control logic included:

A real-time state observer for in-cylinder oxygen mass estimation
A simplified packaging scheme for all air-handling and fueling parameters
A finite state machine for control mode switching
Combustion control models to maintain robust alternative combustion during transients
Smooth rich/lean switching during lean NOx trap (LNT) regeneration without post injection

The control logic was evaluated on a passenger car equipped with a 4-way catalyst system with LNT and was instrumental in achieving U.S. Tier II, Bin 5 emission targets with good drivability and low NVH.

For more information about our powertrain control capabilities, or how you can contract with SwRI, please contact Jayant Sarlashkar at jsarlashkar@swri.org or (210) 522-5506.

powertraincontroltech.swri.org

Contact Information

Jayant Sarlashkar

Powertrain Control

(210) 522-5506

jsarlashkar@swri.org

powertraincontroltech.swri.org

Related Terminology

powertrain control

demonstration vehicle

alternative combustion

4-way catalyst

airflow-dominant control

control logic

Rapid Prototyping Electronic Control System (RPECS™)