 |
|
|||||||||
|
|
||||||||||
|
|
Reference: 03-4632 Client: Worldwide Duration: Forty-eight Months This four-year multi-client effort evaluated a number of precompetitive engine and aftertreatment technologies for meeting ultra-low emissions vehicle (ULEV) standards. The approach included detailed research in a number of areas: Mixture PreparationAir-assist injectors and various other strategies were employed to achieve efficient fuel transport in-cylinder, leading to rapid, misfire-free, low-emissions engine starts. These research efforts resulted in excellent cold engine performance. ControlsThe original equipment manufacturer's (OEM) control system was completely replaced with a custom Southwest Research Institute (SwRI) control system. This allowed rapid synchronization of the control system to the engine within one half of a crankshaft revolution on startup. Cylinder-event-based logic was used during startup to obtain misfire-free starts. Model-based control including a manifold air pressure observer and fuel wall-wetting models were used to obtain excellent transient fuel control. Combustion Chamber DesignThe effect of swirl and other air motion on cold-start performance was measured. AftertreatmentA key to low-emissions is the coordination of the engine control and the aftertreatment system. A technology for exhaust port combustion was used to raise the front-face temperature of a close-coupled catalyst to 400°C within three seconds of the beginning of cranking. Hydrocarbon emissions approach zero in about 30 seconds following cranking.
Please browse this web site to see the full capabilities and experience of SwRI and the Engine, Emissions & Vehicle Research Division. Then give us an opportunity to become an extension of your engineering department.
For a more comprehensive review of the development of gasoline engines to meet ULEV, or information on how you can contract with SwRI, please contact Terry Alger at talger@swri.org or (210) 522-5505.
|
|
||||||||
|
| 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 |
||||||||||
