Record Display for the EPA National Library Catalog

RECORD NUMBER: 31 OF 652

Main Title 91 RON-increased compression ratio engine demonstration /
Author Godici, Patrick, E. ; Liljedahl, Douglas R. ; Terry., Jerry L.
Other Authors
Author Title of a Work
Godici, Patrick E.
Kraus, Bernhard J.
Wagner, Robert.
CORP Author Environmental Protection Agency, Ann Arbor, Mich. Emission Control Technology Div.; Exxon Research and Engineering Co., Linden, NJ. Products Research Div.;
Publisher United States Environmental Protection Agency,
Year Published 1978
Report Number EPA 460/3-78-009
Stock Number PB-289 959
OCLC Number 52465215
Subjects Accelerometers ; Automobiles--Fuel consumption
Internet Access
Description Access URL
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=9100X8QB.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EKBD  EPA-460/3-78-009 Research Triangle Park Library/RTP, NC 10/26/2011
ELBD ARCHIVE EPA 460-3-78-009 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
NTIS  PB-289 959 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation iii, 617 pages : illustrations ; 28 cm
Abstract
A 1975 California model automobile with an 8:1 C.R. 350 CID engine was modified by increasing the compression ratio to 9:1 which resulted in improved fuel economy. The higher NOx emissions were reduced to the base level by substituting a back pressure-controlled EGR unit for the original valve and increasing the EGR flow. Four approaches were tried in an engine dynamometer installation to lower the octane requirement of the 9:1 C.R. engine. These were (1) increase turbulence by increasing the squish area, (2) use dual spark plug ignition to minimize flame travel time, (3) use aluminum heads to obtain better heat transfer, and (4) use knock sensor-actuated spark retard to temporarily de-tune the engine when knock occurs. Of these, the latter approach showed the most promise and was installed in the vehicle to control the level of detonation in the modified 9:1 C.R. vehicle. The knock sensor (accelerometer) is attached to one of the cylinder heads of the engine. When knock occurs, the vibration is picked up by the sensor, the signal is filtered to remove some of the engine background noise, and the knock pulse is detected. When the amplitude of the detected knock signal exceeds a threshold value, the spark timing is retarded. When no knocking is detected over a waiting period, the timing is advanced back to its normal schedule. Using this system, the vehicle's octane requirement can be lowered several numbers with some performance debit, i.e., slower acceleration times.
Notes
"EPA 460/3-78-009"--Cover "September 1978"--Cover Project officer: Robert Wagner. "EPA contract no. 68-03-2162."