Beijing Representative Office News Release
SwRI's HEDGE® technology
eliminates low-speed pre-ignition in highly boosted engines
San Antonio — June 28, 2010 — Southwest Research Institute
(SwRI) has successfully demonstrated that its HEDGE® (High-Efficiency, Dilute
Gasoline Engine) technology, using cooled exhaust gas recirculation (EGR) and
advanced ignition systems, suppresses low-speed pre-ignition in turbocharged
gasoline direct-injection engines. Low-speed pre-ignition (LSPI) causes heavy
engine knock and can seriously damage engine parts or cause complete engine
美国圣安东尼奥，2010年X月X日 – 近日，
The presence of low-speed pre-ignition is considered a
major impediment to automobile manufacturers' efforts to aggressively downsize
engines to reduce carbon dioxide emissions.
"This is a substantial development because it has the
potential to affect every original equipment manufacturer (OEM). We have
demonstrated that our HEDGE technology, primarily the use of cooled EGR,
successfully suppresses low-speed pre-ignition events and in a way that improves
fuel economy," said Dr. Terry Alger, manager of the Advanced Combustion and
Emissions Section in SwRI's Engine, Emissions and Vehicle Research Division.
"This problem was important enough to the automotive industry that SwRI chose to
fund the work internally through our internal research and development program,"
The causes of low-speed pre-ignition events are not
completely understood. They are random, infrequent occurrences that happen at
low speed and high torque, Alger said. Under these conditions, a pre-ignition
event leads to very heavy knock, which can cause catastrophic damage in only a
few engine cycles.
Cooled EGR and its supporting technologies for high
efficiency are being investigated in SwRI's
HEDGE II consortium. HEDGE II is in
the second year of a cooperative research consortium aimed at developing a
high-efficiency gasoline engine for both light-duty automotive, medium-duty and
heavy-duty markets. This four-year program expands on earlier efforts to improve
gasoline engine technology for future emissions and fuel economy requirements.
The first HEDGE consortium focused on high levels of EGR
combined with supporting technologies such as advanced ignition systems and
advanced boosting technology to develop strategies for high efficiency.
"What we were able to accomplish through the first HEDGE
consortium showed we could significantly improve gasoline engine performance and
efficiency," Alger said. "Not only were we able to decrease fuel consumption,
but we were also able to lower emissions significantly." SwRI engineers have
been working on low-speed pre-ignition suppression internally for the past year.
"It is another significant step forward in developing an
aggressive knock mitigation strategy," Alger said. "Our internally funded work
has also looked into the fuel's effect on pre-ignition as well as potential non-EGR
hardware and control solutions, but our first goal was to show how our cooled
EGR technology suppresses the phenomenon."
SwRI also is working on examining lubricant effects on
LSPI and expects to begin a separate consortium on the topic to develop new
lubricants and lubricant testing methods.
HEDGE II consortium members represent the transportation
industry in Asia, Europe and the United States. They are from a broad industry
cross section, including light, heavy-duty and off-road engine manufacturers,
component suppliers and oil and fuel companies. There are 23 members of the
consortium, including most major automotive manufacturers.
"We will continue to develop these
concepts that were initiated in the first HEDGE program and
further develop the supporting technologies to implement this strategy in modern
engines," Alger said. "We are already seeing concepts developed in HEDGE I enter
As an independent R&D laboratory, SwRI has extensive
experience in managing consortia. Since 1991, a separate Clean Diesel consortium
has conducted research in low-emission diesel engines with as many as 46 member
It’s noticed that at 2010 China Auto Engine High-level
Conference last week, Mr. Robert R. Burrahm，the Chief Representative Officer,
SwRI Beijing Representative office, introduced HEDGE II at the conference, which
shows the SwRI’s confidence of HEDGE ™ to help solve problems of emissions and
fuel consumption in Chinese automobile industry.
The next meeting for the HEDGE II Consortium is scheduled
for June 21, 2010. For more information about the consortium, contact Alger at
(210) 522-5505, fax (210) 522-2019 or e-mail at
For more information contact
Rob Leibold at (210) 522-2258, Communications Department, Southwest Research
Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510.
SwRI Beijing Representative Office News Release
Beijing Liaison Office
Engine, Emissions and Vehicle Research
Mechanical Engineering Division
June 06, 2013