NCSU is currently seeking an industry partner to commercialize a new fuel injection device that offers both significantly improved fuel efficiency and reduced harmful emissions.
Current fuel injection devices deliver fuel into the engine cylinder via a multi-hole injection device or pintle-type injection device with fixed injection cone angles for both Spark-Ignition (SI) and Compression Ignition (CI) engines. They often lead to fuel-wall impingement and cylinder-liner wetting resulting in higher hydrocarbon and carbon monoxide emissions and lower fuel efficiency. In order to meet the more stringent emission regulations, low emission combustion methods, such as Homogeneous Charge Combustion Ignition (HCCI) combustion or low-temperature combustion, are gaining traction. However, precise control of air-fuel mixing is a critical requirement for HCCI. Currently available fuel delivery technologies lack flexibility in meeting these HCCI mixture requirements due to fixed injection cone angles.
Researchers at NC State have developed a novel fuel injection device that significantly improves the flexibility in spray cone geometry and flow rate control, thereby accurately controlling the air-fuel mixing process for HCCI combustion. The fuel flow rate is controlled by the opening and closing of a valve at the core of the device, while the spray cone angle is controlled independently by a pintle mechanism that changes the pintle location in the injection nozzle. A low pressure prototype of this device has been tested and has produced favorable results. The device can be adapted to both SI and CI engines and is appropriate for any type of internal combustion engine, including gasoline, diesel or hybrid engines; mobile or stationary engines; and engines used for civil or military purposes. Furthermore, the fuel injection device is potentially applicable to any fluid delivery process requiring independent control of flow rate and spray cone geometry.
- Enhances flexibility in spray cone geometry and control of fuel flow rate
- Improves the air-fuel mixing process to more easily meet emission regulations
- Offers low hydrocarbon and carbon monoxide emissions and higher fuel efficiency
- Applicable to any type of internal combustion engine, including both SI and CI engines
Related Patent Information
- This technology is protected by US Patent Application 12/812,553 “Fuel injection device for an internal combustion engine, and associated method” and International Patent Application PCT/US09/30707.
About the Inventors
Dr. Tiegang Fang is an Associate Professor of Mechanical and Aerospace Engineering at North Carolina State University. He received his Bachelor of Engineering in Automotive Engineering from Tsinghua University in China, his MS in mechanical Engineering from Rutgers University-New Brunswick, and his PhD in the same from the University of Illinois at Urbana-Champaign. Dr. Fang’s research areas lie in combustion and propulsion, internal combustion engines, exhaust emissions and air pollution control, alternative fuels, renewable energy, spray and atomization, laser diagnostics for reacting flows, energy conversion systems, heat and mass transfer, and fluid mechanics.
Dr. Gregory Buckner is a Professor of Mechanical and Aerospace Engineering at North Carolina State University and an Affiliate Faculty member with the UNC/NCSU Joint Department of Biomedical Engineering. He earned his BS in Mechanical Engineering from Louisiana State University, his MS from Virginia Polytechnic Institute, and his PhD from the University of Texas at Austin. Dr. Buckner’s research areas lie in modeling, analysis, and control of dynamic systems, electromechanical systems, surgical robotics, intelligent control, and mechatronics.