SOUTHWEST RESEARCH INSTITUTE

Home

Site Map

	The SwRI-developed RPECS™, used extensively in test cell developmental applications, was used in this program.
	Graphs showing engine torque vs. exhaust gas
	Observers and estimators were designed to construct the necessary system states for the controllers, based on the available measurements from the engine.

To achieve seamless transient operation of engines with multiple combustion modes, Southwest Research Institute (SwRI) engineers developed control-oriented engine intake and exhaust system dynamical models and used them for the design of the control system. 

Model-based multiple-input-multiple-output (MIMO) nonlinear robust controllers such as sliding mode control organized by a finite state machine (FSM) based supervisory controller, were used to achieve seamless transition among different combustion modes. The inherent singularity in turbocharged diesel engines was addressed using special techniques.

Observers and estimators were designed to construct the necessary system states for the controllers, based on the available measurements from the engine. The gas-handling devices were controlled by two paths. One was the feed- forward terms, decided by desired torque and engine speed. Another was the feed-back contributions, based on the desired and measured/estimated states through the robust nonlinear control laws.

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

| Engine and Vehicle R&D Department | Engine, Emissions & Vehicle Research Division | SwRI Home |

Southwest Research Institute^® (SwRI^®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 11 technical divisions.

December 28, 2012