Subject:
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Re: vision command idea...
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 15 Dec 2000 22:03:06 GMT
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Viewed:
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1701 times
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Another problem with all wheel steering is the problem of "switch over."
Honda had a prototype of an all wheel steering car which used the mechanism
of turning the wheels in opposite directions at slow speeds for improved
turning radius and turning the wheels in the same direction at high speeds
for improved performance. The problem arose when the car was at the "switch
over" point. Which way should the wheels turn? What happens when the
driver turns while accelerating? It turns out to be non trivial and Honda
abandoned the experiment.
Chris
"Jennifer Clark" <jen@vulture.dmem.strath.ac.uk> wrote in message
news:G5Kx4C.12A@lugnet.com...
> In lugnet.robotics, "Tilman Sporkert" <tilman@webmethods.com> writes:
> >
> > If you are parallel and very close to an obstacle, like a curb or a wall,
> > you can't get away from it with all-wheel steering.
>
> Thanks for that explanation, everything is much clearer now. I suppose it • is
> to do with the line perpendicular to the vehicle coinciding with the • centre
> point of the turning circle; with all wheel equal steering, it will
> intersect the middle of the vehicle, leading to the behaviour you • described,
> but with front wheel only, it will tend to be towards the back, thus • causing
> the vehicle to "pivot" round the rear with the sideways movement at the • front.
>
> I feel a bit daft for missing that now, in retrospect it seems obvious :-)
>
> Jennifer Clark
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Message has 1 Reply:
 | | Re: vision command idea...
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| (...) For our purposes, this may not matter. However, couldn't the rear wheels be steered with a reciprocator? So as the steering wheel turns to the right, the rear wheels start turning right, then turn back to the left? So at, say 1/4 turn, the (...) (24 years ago, 18-Dec-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: vision command idea...
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| (...) Thanks for that explanation, everything is much clearer now. I suppose it is to do with the line perpendicular to the vehicle coinciding with the centre point of the turning circle; with all wheel equal steering, it will intersect the middle (...) (24 years ago, 14-Dec-00, to lugnet.robotics)
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