Past Clean Diesel
Successes
Clean High-Efficiency Diesel
Engine VI Consortium
Contact Information
Charles Roberts, Ph.D.
Institute Engineer
Engine, Emissions and Vehicle Research
(210) 522-5521
croberts@swri.org
Full-time HCCI engine photograph
Full-time HCCI engine schematic
Southwest Research Institute (SwRI) has completed five previous consecutive consortium programs targeted to improve diesel engines. These programs have resulted in intellectual property and technologies that have been integrated into today’s production engines. Below are brief accomplishments from these previous programs.
Clean Diesel I (1991-1995)
- Focused on development of EGR (exhaust gas recirculation) technology for control of engine-out NOx emissions
- Achieved 2004 emissions regulations in 1994
- Technology now in production on all on-road diesel engines
Clean Diesel II (1995-1999)
- Examined in detail the effects of dilute combustion on engine-out emissions
- Focused on advanced EGR systems, including development of model-based control technology
- Developed a fuel-injection system that demonstrated the advantages of rapid mixing using small holes and high pressures (up to 300 MPa), a concept that is now becoming part of the production solution
Clean Diesel III (1999-2003)
- Initially focused on development of diesel aftertreatment systems, including SCR+cDPF and LNT+cDPF systems
- Demonstrated US 2010 compliant emissions levels using MBC+LNT+cDPF system in 2003
- Approached low operating temperature emissions control using advanced low-temperature combustion technology, incorporating VVA (variable valve actuation) technology
- Developed full operating range HCCI, including fuel effects
Clean Diesel IV (2003-2007)
- Refined model-based control demonstrated US 2010 compliant emissions levels using MBC+LNT+cDPF system
- Continued development of full operating range HCCI engine concept
- Demonstrated acceptable operation with peak loads of 11 Bar in a multi-cylinder HCCI engine using low-octane gasoline specially formulated for HCCI operation
- Preliminary data indicated that Tier II, Bin 2 diesel technology is possible
Clean Diesel V (2007-2011)
- Refined model-based control demonstrated US 2010 compliant emissions levels using MBC+LNT+cDPF system
- Continued development of full operating range HCCI engine concept
- Demonstrated acceptable operation with peak loads of 11 Bar in a multi-cylinder HCCI engine using low-octane gasoline specially formulated for HCCI operation
- Preliminary data indicated that Tier II, Bin 2 diesel technology is possible
- Focused on development of advanced combustion engines, including full operating range HCCI (homogeneous charge-compression ignition) engine development
- Dilute diffusion combustion engine development
- Expansion of the advanced SwRI low-temperature combustion technology
- Integration of cost-effective aftertreatment systems
- Advanced model-based control system development
Related Terminology
clean diesel engine technology • NOx reduction • particulate reduction • exhaust gas recirculation • EGR • heavy-duty diesel engine • diesel engine emissions
