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[DPRG] IMU Odometry

Subject: [DPRG] IMU Odometry
From: Kenneth Maxon kmaxon at qwest.net
Date: Mon Jul 17 20:50:04 CDT 2006

In Automobiles, limited slip differentials = accelerated tire wear on
pavement.  Given the first statement, I would interpret this as less dead
reckoning accuracy?  This second statement is speculation on my part, just
thought I would offer up the first piece that racing fans everywhere can
agree with.


-----Original Message-----
From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org]On
Behalf Of Ed K.
Sent: Monday, July 17, 2006 10:40 AM
To: kip.moravec at specmanufacturing.com; 'Sluggy!'
Cc: 'dprglist'
Subject: RE: [DPRG] IMU Odometry

> Then the next issue is standard differential or positraction? Standard
> differential would slip more, positraction would slip less.

Since positraction (called limited-slip, but really it's limited-grip)
exerts an added coupling torque between the wheels that resists rotation of
the vehicle around the center of the axle, I think it's more likely to
introduce slippage difference between the wheels and ground, and tend to
cause small heading errors that would vary depending on the surface and the
type of tire.  It might be harder to get a consistent calibration.

A positraction differential can increase acceleration ability for a vehicle
with a large difference in wheel force to the ground between sides, as when
cornering at high 'G' forces, or when one wheel is on a bump.  In those
cases, when the lightly-loaded wheel would otherwise spin, the positraction
can avoid gross heading errors, up to the point where it does start to allow

Ed Koffeman

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