RE: [Algorithms] Car engine behaviour From: Robert Dibley - 2006-04-27 14:17:18 ```You are dividing your torque down by the gear ratio aren't you ? > -----Original Message----- > From: gdalgorithms-list-admin@... [mailto:gdalgorithms- > list-admin@...] On Behalf Of Madoc Evans > Sent: 27 April 2006 14:46 > To: gdalgorithms-list@... > Subject: RE: [Algorithms] Car engine behaviour > > > Okay, this was my initial thought but what Tom said concerned because > it seems to me that in my simulation high gears generally behave too > well at low velocities and something else must be missing. My engine > stalls < 800 rpm and goes up to 7000, I did try som non-linear RPM- > torque relations but they didn't seem right. > > I guess at this point > I'll try pluggin something like a real torque curve in and see what > happens. Perhaps by tweaking some stuff I'll get good results. > Discussing this has also cleared up my ideas about a number of issues. > I'll let you know how it goes. > > Thanks for all the help, > > Madoc > > > ---- > Messaggio originale---- > Da: blimey.rob@... > Data: 27-apr-2006 > 3.17 PM > A: > Ogg: RE: > [Algorithms] Car engine behaviour > > > Now, if it > > is just as easy to > accellerare from 4 to 5 kph as 40 to 41, then why > > can high gears do > the latter and not the former? Even if it's not from > > a stand-still, > accellerating in 5th gear from 20mph is not very > > effective, to the > point that I don't think I've ever even attempted it, > > I expect that > commonly the RPM would drop to the point of stalling. > > Take a look at a > torque curve and you will see why. > Put a car in 1st gear at 10 mph, and > it may well require 2000rpm, which is > certainly well into the part of > the torque curve where you actually get some > power, and probably quite > a decent amount of it on most cars. > Now put it in 5th gear and it would > require 400rpm (it would on my car > anyway) which is actually below the > stall point for most petrol engines. > There is no torque whatsoever at > this level - in fact on my car there is no > torque below about 1000rpm. > You know that thing where Tom said about 10% variation in torque ? > He > was talking about the middle bit of the curve, the bit which you try to > keep your engine in all the time. The bits outside that collapse to > zero > pretty quickly. > > Rob > > > > > ------------------------------------------------------- > Using Tomcat > but need to do more? Need to support web services, security? > Get stuff > done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache > Geronimo > http://sel.as-us.falkag.net/sel? > cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > GDAlgorithms-list > mailing list > GDAlgorithms-list@... > https://lists. > sourceforge.net/lists/listinfo/gdalgorithms-list > Archives: > http: > //sourceforge.net/mailarchive/forum.php?forum_id=6188 > > > > > > ------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job > easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > GDAlgorithms-list mailing list > GDAlgorithms-list@... > https://lists.sourceforge.net/lists/listinfo/gdalgorithms-list > Archives: > http://sourceforge.net/mailarchive/forum.php?forum_id=6188 ```