## RE: [Algorithms] Car engine behaviour

 RE: [Algorithms] Car engine behaviour From: Willem de Boer - 2006-04-27 14:02:20 ```In the absence of any friction you may well find that it's possible to drive off from stand still in 4th gear.. -----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=20 it seems to me that in my simulation high gears generally behave too=20 well at low velocities and something else must be missing. My engine=20 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=20 I'll try pluggin something like a real torque curve in and see what=20 happens. Perhaps by tweaking some stuff I'll get good results.=20 Discussing this has also cleared up my ideas about a number of issues.=20 I'll let you know how it goes. Thanks for all the help, Madoc ---- Messaggio originale---- Da: blimey.rob@... Data: 27-apr-2006=20 3.17 PM A: Ogg: RE:=20 [Algorithms] Car engine behaviour > Now, if it > is just as easy to=20 accellerare from 4 to 5 kph as 40 to 41, then why > can high gears do=20 the latter and not the former? Even if it's not from > a stand-still,=20 accellerating in 5th gear from 20mph is not very > effective, to the=20 point that I don't think I've ever even attempted it, > I expect that=20 commonly the RPM would drop to the point of stalling. Take a look at a=20 torque curve and you will see why. Put a car in 1st gear at 10 mph, and=20 it may well require 2000rpm, which is certainly well into the part of=20 the torque curve where you actually get some power, and probably quite=20 a decent amount of it on most cars. Now put it in 5th gear and it would=20 require 400rpm (it would on my car anyway) which is actually below the=20 stall point for most petrol engines. There is no torque whatsoever at=20 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=20 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=20 zero pretty quickly. Rob =20 ------------------------------------------------------- Using Tomcat=20 but need to do more? Need to support web services, security? Get stuff=20 done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache=20 Geronimo http://sel.as-us.falkag.net/sel? cmd=3Dlnk&kid=3D120709&bid=3D263057&dat=3D121642 _______________________________________________ GDAlgorithms-list=20 mailing list GDAlgorithms-list@... https://lists. sourceforge.net/lists/listinfo/gdalgorithms-list Archives: http: //sourceforge.net/mailarchive/forum.php?forum_id=3D6188 ------------------------------------------------------- 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=3Dlnk&kid=3D120709&bid=3D263057&dat=3D= 121642 _______________________________________________ GDAlgorithms-list mailing list GDAlgorithms-list@... https://lists.sourceforge.net/lists/listinfo/gdalgorithms-list Archives: http://sourceforge.net/mailarchive/forum.php?forum_id=3D6188 ```