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tb1
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re: Why hasn't that steering wheel gone away?
tb1   3/8/2011 2:49:20 AM
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Here's a link to an Altera app note on single event upsets: http://www.altera.com/support/devices/reliability/seu/seu-index.html

tb1
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Rookie
re: Why hasn't that steering wheel gone away?
tb1   3/8/2011 2:42:08 AM
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If you've ever worked with radiation you know that it only takes one cosmic ray hit to change a flip-flop value. Sometimes it isn't even a cosmic ray--it can be an alpha particle emanating from the ceramic package of an IC. It doesn't happen often, but it does happen (kind of like the lottery). Check Altera/Xilinx/Micron app notes on radiation for statistics on how often it can occur. How will your steering react to that changed flip-flop? Even radiation emanating from a nearby atom bomb explosion won't affect a mechanical steering wheel.

Matt Thayer
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re: Why hasn't that steering wheel gone away?
Matt Thayer   3/8/2011 12:49:09 AM
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Silicon does fail. But then again, so does metal. I had the seatstays pop off the frame on a bicycle I was riding (putting a premature end to my ride), with not a microcontroller in sight!

zeeglen
User Rank
Blogger
re: Why hasn't that steering wheel gone away?
zeeglen   3/7/2011 11:13:00 PM
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This is really scary. Time to buy a bicycle. Bill, what vehicles do you know of that do not have mechanical steering linkages? Let us know what to avoid. I do not ever want a shorted transistor to steer my vehicle into oncoming traffic without some sort of over-ride. Sort of like a separate button to shut off a runaway motor.

zeeglen
User Rank
Blogger
re: Why hasn't that steering wheel gone away?
zeeglen   3/7/2011 10:55:10 PM
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I will never drive a vehicle that does not have a fully mechanical steering linkage. Let's hope that the automotive designers and regulatory agencies continue to think likewise.

BicycleBill
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Rookie
re: Why hasn't that steering wheel gone away?
BicycleBill   3/7/2011 10:54:05 PM
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I hate to disappoint all of you who think there is a direct, mechanical connection between the steering wheel and the car's wheels--but in many cars today, it's already drive by wire using a sensor/pickoff on the steering column. So whle we may feel that an all-mechanical system, aided by power assist, is more reliable, you don't have it in many cases, even if the look and feel makes you think you do.

zeeglen
User Rank
Blogger
re: Why hasn't that steering wheel gone away?
zeeglen   3/7/2011 10:50:08 PM
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Aircraft have backup systems to compensate for failures. It is not a question of "common person" learning how to use a joystick. It is a fact that silicon fails. Shorted or open, silicon fails without warning. I have replaced enough failed transistors to know this.

Duane Benson
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Blogger
re: Why hasn't that steering wheel gone away?
Duane Benson   3/7/2011 10:28:10 PM
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The thought of a servo motor failure with a joystick controlled car should scare you. However, even with a steering wheel, drive by wire without a mechanical connection between steering wheel and steering rack, is on the way. Soon it won't matter if it's a joystick or wheel, the failure mode will be just as likely or unlikely and just as catastrophic.

_hm
User Rank
CEO
re: Why hasn't that steering wheel gone away?
_hm   3/7/2011 10:08:03 PM
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Everyday, so many pilots fly different aircraft machine at much higher speed with many more complex task. However, they are properly trianed for the system. Eventually, system will become more friendly and common person will quicly learn how to use it.

zeeglen
User Rank
Blogger
re: Why hasn't that steering wheel gone away?
zeeglen   3/7/2011 9:46:51 PM
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Absolutely not! When I am piloting a machine moving at 70 MPH I want the steering to be based on steel, not silicon.

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