Lexus 450h father to 2010 Prius
#1
Lexus 450h father to 2010 Prius
http://pressroom.toyota.com/pr/tms/lexus/LEX-14-08.aspx
I'd seen a reference to this but while researching the SAE papers, I came across this press release. This press release does an excellent job of showing how Toyota develops new technology and shares it across model lines.
Bob Wilson
. . .
With conventional four-cycle engines, there are times when fuel enrichment becomes necessary to cool the exhaust gases to prevent degradation or destruction of the catalytic converters. With the Atkinson cycle, the expansion/power stroke is longer than the compression stroke so that combustion energy can more effectively used for production of engine power. This results in lower exhaust gas temperatures.
In the process of re-circulating exhaust gas, the cooled EGR system increases the specific heat capacity, also resulting in lower exhaust gas temperature. Regulating the amount of EGR can also control the exhaust gas temperature.
The combination of the Atkinson cycle and cooled EGR minimizes the need for fuel enrichment. The benefit is significant reduction of fuel consumption, especially during high-load driving (e.g.: hill climbs and freeway driving).
. . .
With conventional four-cycle engines, there are times when fuel enrichment becomes necessary to cool the exhaust gases to prevent degradation or destruction of the catalytic converters. With the Atkinson cycle, the expansion/power stroke is longer than the compression stroke so that combustion energy can more effectively used for production of engine power. This results in lower exhaust gas temperatures.
In the process of re-circulating exhaust gas, the cooled EGR system increases the specific heat capacity, also resulting in lower exhaust gas temperature. Regulating the amount of EGR can also control the exhaust gas temperature.
The combination of the Atkinson cycle and cooled EGR minimizes the need for fuel enrichment. The benefit is significant reduction of fuel consumption, especially during high-load driving (e.g.: hill climbs and freeway driving).
. . .
Bob Wilson
Last edited by bwilson4web; 02-16-2009 at 10:06 AM.
Thread
Topic Starter
Forum
Replies
Last Post
sheildshome@yahoo.com
Lexus GS 450h
0
08-29-2009 11:03 PM