I am investigating the possible effects of under-inflated tyres on
ESC and also on roll stability (primarily for passenger cars). NHTSA
has commissioned a great deal of research on under-inflated tyres for
its tyre pressure monitoring regulation but there seems to be very
little reference to ESC or rollover propensity in these projects.
In view of the remarkable road safety benefits that are showing up
for ESC in cars, I would like to know if the ESC system performance
is degraded by under-inflated tyres. There are some reports of ABS
performance being degraded and since ESC uses many of the same
sensors, it seems likely that its performance would also be degraded.
Secondly, it seems likely that static and dynamic rollover resistance
would be affected by under-inflated tyres. It the static case, the
reduced vertical stiffness of the tyre would allow a greater roll
angle - resulting in an outward shift in the C of G and a reduced
static rollover limit. Dynamic rollover stability is much more
complicated but I would expect that the static problems would be
exacerbated due to resonance effects.
Advice on research into these topics would be appreciated.
Regards
Michael Paine
Manager
Vehicle Design & Research Pty Limited
Sydney, Australia
==============email signature file for Michael Paine==================
Home http://users.tpg.com.au/mpaine/index.html
Road Safety news http://users.tpg.com.au/mpaine/roadsafe.html
Space news http://users.tpg.com.au/horsts/index.html
Phone (+61 2) 94514870 Mobile 0418165741
Audio and Video conferencing iChat / Windows AIM 5.9 / Skype
=====================================================================
Michael Paine
[log in to unmask]
***********************************************************
The ROAD-TRANSPORT-TECHNOLOGY mailing list is published by
International Forum for Road Transport Technology
www.ifrtt.org
***********************************************************
|