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scott wrote:
>> Well... less suseptable to EMI and corrosion?
>
> Yeh the EMI issue is probably the biggest reason.
There would seem to be quite a lot of electronics in a car - especially
a big alternator and a set of sparkplugs. That's gotta kick out a out of
EMI, one would think...
>> Even so, how can you "sense" the amount of force the user it putting
>> into the system seperately from the amount of force the power assist
>> is putting into it? I can't think of a way of doing that.
>
> Measure how much the steering column is twisted (ie rotation at one end
> minus rotation at the other end) between the steering wheel and where it
> connects to the rack/motor/hydraulics. This will be directly
> proportional to the torque the driver is applying to the wheel, no
> matter what the motor or the wheels are doing.
>
> In mechanical systems, this twist would cause hydraulic valves to open
> and assist the rack moving, in electronic systems there is probably just
> a strain gauge on the steering column that goes through an ATD to the
> software.
I was under the impression that the rod is ridig, and therefore can't
twist (only rotate).
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